From patchwork Fri Nov 1 09:17:19 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Shiju Jose X-Patchwork-Id: 13858973 Received: from frasgout.his.huawei.com (frasgout.his.huawei.com [185.176.79.56]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 25253154C17; Fri, 1 Nov 2024 09:17:53 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=185.176.79.56 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1730452677; cv=none; b=rtLUnNtQw0Q6KaSGXbv6A8t7W+ho2/S/9cLPWhoIlo1My5ckAyJ7aedcJb5CHUGA4vzLbLc/HiVYL8i8NUzv2KFMXkGsaKgMiUoh86XfWgZUe5CQa98j0MNA/sf1gpoyKo4j+Woddr/LqCl6sSnVtJieE2Oj76VxTR3jEEBxgco= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1730452677; c=relaxed/simple; bh=hrpJyw9+3n15pBc1Ept7Dz8NqBT1q0ckDGJO4LtdMRs=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=TDFxENOzeoT48BtMDJHSrIPU2s6zZPCh5WyCps2H0fhGzykc5NiU84wxG9yvqBQYZHo9ctRQn15b9eMBRth83WPHQfplOO8gzZbBhEX2JgVbXcTgN6w7K0ytB9j0mF6mADWfYm11G1TkSgZP2JkmGIdeXfjp8OuT5f9s/h4nsT8= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=huawei.com; spf=pass smtp.mailfrom=huawei.com; arc=none smtp.client-ip=185.176.79.56 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=huawei.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=huawei.com Received: from mail.maildlp.com (unknown [172.18.186.216]) by frasgout.his.huawei.com (SkyGuard) with ESMTP id 4XfwF441ynz6K6Kb; Fri, 1 Nov 2024 17:15:20 +0800 (CST) Received: from frapeml500007.china.huawei.com (unknown [7.182.85.172]) by mail.maildlp.com (Postfix) with ESMTPS id 80B1C1404FC; Fri, 1 Nov 2024 17:17:51 +0800 (CST) Received: from P_UKIT01-A7bmah.china.huawei.com (10.126.171.129) by frapeml500007.china.huawei.com (7.182.85.172) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.1.2507.39; Fri, 1 Nov 2024 10:17:49 +0100 From: To: , , , , CC: , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , Subject: [PATCH v15 01/15] EDAC: Add support for EDAC device features control Date: Fri, 1 Nov 2024 09:17:19 +0000 Message-ID: <20241101091735.1465-2-shiju.jose@huawei.com> X-Mailer: git-send-email 2.43.0.windows.1 In-Reply-To: <20241101091735.1465-1-shiju.jose@huawei.com> References: <20241101091735.1465-1-shiju.jose@huawei.com> Precedence: bulk X-Mailing-List: linux-acpi@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-ClientProxiedBy: lhrpeml500004.china.huawei.com (7.191.163.9) To frapeml500007.china.huawei.com (7.182.85.172) From: Shiju Jose Add generic EDAC device feature controls supporting the registration of RAS features available in the system. The driver exposes control attributes for these features to userspace in /sys/bus/edac/devices/// Co-developed-by: Jonathan Cameron Signed-off-by: Jonathan Cameron Signed-off-by: Shiju Jose --- drivers/edac/edac_device.c | 101 +++++++++++++++++++++++++++++++++++++ include/linux/edac.h | 30 +++++++++++ 2 files changed, 131 insertions(+) diff --git a/drivers/edac/edac_device.c b/drivers/edac/edac_device.c index 621dc2a5d034..e9229b5f8afe 100644 --- a/drivers/edac/edac_device.c +++ b/drivers/edac/edac_device.c @@ -570,3 +570,104 @@ void edac_device_handle_ue_count(struct edac_device_ctl_info *edac_dev, block ? block->name : "N/A", count, msg); } EXPORT_SYMBOL_GPL(edac_device_handle_ue_count); + +/* EDAC device feature */ +static void edac_dev_release(struct device *dev) +{ + struct edac_dev_feat_ctx *ctx = container_of(dev, struct edac_dev_feat_ctx, dev); + + kfree(ctx->dev.groups); + kfree(ctx); +} + +const struct device_type edac_dev_type = { + .name = "edac_dev", + .release = edac_dev_release, +}; + +static void edac_dev_unreg(void *data) +{ + device_unregister(data); +} + +/** + * edac_dev_register - register device for RAS features with EDAC + * @parent: parent device. + * @name: parent device's name. + * @private: parent driver's data to store in the context if any. + * @num_features: number of RAS features to register. + * @ras_features: list of RAS features to register. + * + * Return: + * * %0 - Success. + * * %-EINVAL - Invalid parameters passed. + * * %-ENOMEM - Dynamic memory allocation failed. + * + */ +int edac_dev_register(struct device *parent, char *name, + void *private, int num_features, + const struct edac_dev_feature *ras_features) +{ + const struct attribute_group **ras_attr_groups; + struct edac_dev_feat_ctx *ctx; + int attr_gcnt = 0; + int ret, feat; + + if (!parent || !name || !num_features || !ras_features) + return -EINVAL; + + /* Double parse to make space for attributes */ + for (feat = 0; feat < num_features; feat++) { + switch (ras_features[feat].ft_type) { + /* Add feature specific code */ + default: + return -EINVAL; + } + } + + ctx = kzalloc(sizeof(*ctx), GFP_KERNEL); + if (!ctx) + return -ENOMEM; + + ras_attr_groups = kcalloc(attr_gcnt + 1, sizeof(*ras_attr_groups), GFP_KERNEL); + if (!ras_attr_groups) { + ret = -ENOMEM; + goto ctx_free; + } + + attr_gcnt = 0; + for (feat = 0; feat < num_features; feat++, ras_features++) { + switch (ras_features->ft_type) { + /* Add feature specific code */ + default: + ret = -EINVAL; + goto groups_free; + } + } + + ctx->dev.parent = parent; + ctx->dev.bus = edac_get_sysfs_subsys(); + ctx->dev.type = &edac_dev_type; + ctx->dev.groups = ras_attr_groups; + ctx->private = private; + dev_set_drvdata(&ctx->dev, ctx); + + ret = dev_set_name(&ctx->dev, name); + if (ret) + goto groups_free; + + ret = device_register(&ctx->dev); + if (ret) { + put_device(&ctx->dev); + return ret; + } + + return devm_add_action_or_reset(parent, edac_dev_unreg, &ctx->dev); + +groups_free: + kfree(ras_attr_groups); +ctx_free: + kfree(ctx); + return ret; +} +EXPORT_SYMBOL_GPL(edac_dev_register); diff --git a/include/linux/edac.h b/include/linux/edac.h index b4ee8961e623..e19706311ec0 100644 --- a/include/linux/edac.h +++ b/include/linux/edac.h @@ -661,4 +661,34 @@ static inline struct dimm_info *edac_get_dimm(struct mem_ctl_info *mci, return mci->dimms[index]; } + +/* EDAC device features */ + +#define EDAC_FEAT_NAME_LEN 128 + +/* RAS feature type */ +enum edac_dev_feat { + RAS_FEAT_MAX +}; + +/* EDAC device feature information structure */ +struct edac_dev_data { + u8 instance; + void *private; +}; + +struct edac_dev_feat_ctx { + struct device dev; + void *private; +}; + +struct edac_dev_feature { + enum edac_dev_feat ft_type; + u8 instance; + void *ctx; +}; + +int edac_dev_register(struct device *parent, char *dev_name, + void *parent_pvt_data, int num_features, + const struct edac_dev_feature *ras_features); #endif /* _LINUX_EDAC_H_ */ From patchwork Fri Nov 1 09:17:20 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Shiju Jose X-Patchwork-Id: 13858975 Received: from frasgout.his.huawei.com (frasgout.his.huawei.com [185.176.79.56]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 2DBE2155CBF; 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dmarc=pass (p=quarantine dis=none) header.from=huawei.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=huawei.com Received: from mail.maildlp.com (unknown [172.18.186.216]) by frasgout.his.huawei.com (SkyGuard) with ESMTP id 4XfwBN6VWHz6L71V; Fri, 1 Nov 2024 17:13:00 +0800 (CST) Received: from frapeml500007.china.huawei.com (unknown [7.182.85.172]) by mail.maildlp.com (Postfix) with ESMTPS id B3BF41404FC; Fri, 1 Nov 2024 17:17:54 +0800 (CST) Received: from P_UKIT01-A7bmah.china.huawei.com (10.126.171.129) by frapeml500007.china.huawei.com (7.182.85.172) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.1.2507.39; Fri, 1 Nov 2024 10:17:52 +0100 From: To: , , , , CC: , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , Subject: [PATCH v15 02/15] EDAC: Add scrub control feature Date: Fri, 1 Nov 2024 09:17:20 +0000 Message-ID: <20241101091735.1465-3-shiju.jose@huawei.com> X-Mailer: git-send-email 2.43.0.windows.1 In-Reply-To: <20241101091735.1465-1-shiju.jose@huawei.com> References: <20241101091735.1465-1-shiju.jose@huawei.com> Precedence: bulk X-Mailing-List: linux-acpi@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-ClientProxiedBy: lhrpeml500004.china.huawei.com (7.191.163.9) To frapeml500007.china.huawei.com (7.182.85.172) From: Shiju Jose Add a generic EDAC scrub control to manage memory scrubbers in the system. Devices with a scrub feature register with the EDAC device driver, which retrieves the scrub descriptor from the EDAC scrub driver and exposes the sysfs scrub control attributes for a scrub instance to userspace at /sys/bus/edac/devices//scrubX/. The common sysfs scrub control interface abstracts the control of arbitrary scrubbing functionality into a common set of functions. The sysfs scrub attribute nodes are only present if the client driver has implemented the corresponding attribute callback function and passed the operations(ops) to the EDAC device driver during registration. Co-developed-by: Jonathan Cameron Signed-off-by: Jonathan Cameron Signed-off-by: Shiju Jose --- Documentation/ABI/testing/sysfs-edac-scrub | 74 ++++++++ drivers/edac/Makefile | 1 + drivers/edac/edac_device.c | 40 +++- drivers/edac/scrub.c | 209 +++++++++++++++++++++ include/linux/edac.h | 34 ++++ 5 files changed, 354 insertions(+), 4 deletions(-) create mode 100644 Documentation/ABI/testing/sysfs-edac-scrub create mode 100755 drivers/edac/scrub.c diff --git a/Documentation/ABI/testing/sysfs-edac-scrub b/Documentation/ABI/testing/sysfs-edac-scrub new file mode 100644 index 000000000000..d8d11165ff2a --- /dev/null +++ b/Documentation/ABI/testing/sysfs-edac-scrub @@ -0,0 +1,74 @@ +What: /sys/bus/edac/devices//scrubX +Date: Jan 2025 +KernelVersion: 6.13 +Contact: linux-edac@vger.kernel.org +Description: + The sysfs EDAC bus devices //scrubX subdirectory + belongs to an instance of memory scrub control feature, + where directory corresponds to a device/memory + region registered with the EDAC device driver for the + scrub control feature. + The sysfs scrub attr nodes are only present if the parent + driver has implemented the corresponding attr callback + function and provided the necessary operations to the EDAC + device driver during registration. + +What: /sys/bus/edac/devices//scrubX/addr +Date: Jan 2025 +KernelVersion: 6.13 +Contact: linux-edac@vger.kernel.org +Description: + (RW) The base address of the memory region to be scrubbed + for on-demand scrubbing. Setting address would start + scrubbing. The size must be set before that. + The readback addr value would be non-zero if the requested + on-demand scrubbing is in progress, zero otherwise. + +What: /sys/bus/edac/devices//scrubX/size +Date: Jan 2025 +KernelVersion: 6.13 +Contact: linux-edac@vger.kernel.org +Description: + (RW) The size of the memory region to be scrubbed + (on-demand scrubbing). + +What: /sys/bus/edac/devices//scrubX/enable_background +Date: Jan 2025 +KernelVersion: 6.13 +Contact: linux-edac@vger.kernel.org +Description: + (RW) Start/Stop background(patrol) scrubbing if supported. + +What: /sys/bus/edac/devices//scrubX/enable_on_demand +Date: Jan 2025 +KernelVersion: 6.13 +Contact: linux-edac@vger.kernel.org +Description: + (RW) Start/Stop on-demand scrubbing the memory region + if supported. + +What: /sys/bus/edac/devices//scrubX/min_cycle_duration +Date: Jan 2025 +KernelVersion: 6.13 +Contact: linux-edac@vger.kernel.org +Description: + (RO) Supported minimum scrub cycle duration in seconds + by the memory scrubber. + +What: /sys/bus/edac/devices//scrubX/max_cycle_duration +Date: Jan 2025 +KernelVersion: 6.13 +Contact: linux-edac@vger.kernel.org +Description: + (RO) Supported maximum scrub cycle duration in seconds + by the memory scrubber. + +What: /sys/bus/edac/devices//scrubX/current_cycle_duration +Date: Jan 2025 +KernelVersion: 6.13 +Contact: linux-edac@vger.kernel.org +Description: + (RW) The current scrub cycle duration in seconds and must be + within the supported range by the memory scrubber. + Scrub has an overhead when running and that may want to be + reduced by taking longer to do it. diff --git a/drivers/edac/Makefile b/drivers/edac/Makefile index faf310eec4a6..188501e676c7 100644 --- a/drivers/edac/Makefile +++ b/drivers/edac/Makefile @@ -10,6 +10,7 @@ obj-$(CONFIG_EDAC) := edac_core.o edac_core-y := edac_mc.o edac_device.o edac_mc_sysfs.o edac_core-y += edac_module.o edac_device_sysfs.o wq.o +edac_core-y += scrub.o edac_core-$(CONFIG_EDAC_DEBUG) += debugfs.o diff --git a/drivers/edac/edac_device.c b/drivers/edac/edac_device.c index e9229b5f8afe..cd700a64406e 100644 --- a/drivers/edac/edac_device.c +++ b/drivers/edac/edac_device.c @@ -576,6 +576,7 @@ static void edac_dev_release(struct device *dev) { struct edac_dev_feat_ctx *ctx = container_of(dev, struct edac_dev_feat_ctx, dev); + kfree(ctx->scrub); kfree(ctx->dev.groups); kfree(ctx); } @@ -609,6 +610,8 @@ int edac_dev_register(struct device *parent, char *name, const struct edac_dev_feature *ras_features) { const struct attribute_group **ras_attr_groups; + int scrub_cnt = 0, scrub_inst = 0; + struct edac_dev_data *dev_data; struct edac_dev_feat_ctx *ctx; int attr_gcnt = 0; int ret, feat; @@ -619,7 +622,10 @@ int edac_dev_register(struct device *parent, char *name, /* Double parse to make space for attributes */ for (feat = 0; feat < num_features; feat++) { switch (ras_features[feat].ft_type) { - /* Add feature specific code */ + case RAS_FEAT_SCRUB: + attr_gcnt++; + scrub_cnt++; + break; default: return -EINVAL; } @@ -635,13 +641,37 @@ int edac_dev_register(struct device *parent, char *name, goto ctx_free; } + if (scrub_cnt) { + ctx->scrub = kcalloc(scrub_cnt, sizeof(*ctx->scrub), GFP_KERNEL); + if (!ctx->scrub) { + ret = -ENOMEM; + goto groups_free; + } + } + attr_gcnt = 0; for (feat = 0; feat < num_features; feat++, ras_features++) { switch (ras_features->ft_type) { - /* Add feature specific code */ + case RAS_FEAT_SCRUB: + if (!ras_features->scrub_ops || + scrub_inst != ras_features->instance) + goto data_mem_free; + + dev_data = &ctx->scrub[scrub_inst]; + dev_data->instance = scrub_inst; + dev_data->scrub_ops = ras_features->scrub_ops; + dev_data->private = ras_features->ctx; + ret = edac_scrub_get_desc(parent, &ras_attr_groups[attr_gcnt], + ras_features->instance); + if (ret) + goto data_mem_free; + + scrub_inst++; + attr_gcnt++; + break; default: ret = -EINVAL; - goto groups_free; + goto data_mem_free; } } @@ -654,7 +684,7 @@ int edac_dev_register(struct device *parent, char *name, ret = dev_set_name(&ctx->dev, name); if (ret) - goto groups_free; + goto data_mem_free; ret = device_register(&ctx->dev); if (ret) { @@ -664,6 +694,8 @@ int edac_dev_register(struct device *parent, char *name, return devm_add_action_or_reset(parent, edac_dev_unreg, &ctx->dev); +data_mem_free: + kfree(ctx->scrub); groups_free: kfree(ras_attr_groups); ctx_free: diff --git a/drivers/edac/scrub.c b/drivers/edac/scrub.c new file mode 100755 index 000000000000..3978201c4bfc --- /dev/null +++ b/drivers/edac/scrub.c @@ -0,0 +1,209 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * The generic EDAC scrub driver controls the memory scrubbers in the + * system. The common sysfs scrub interface abstracts the control of + * various arbitrary scrubbing functionalities into a unified set of + * functions. + * + * Copyright (c) 2024 HiSilicon Limited. + */ + +#include + +enum edac_scrub_attributes { + SCRUB_ADDRESS, + SCRUB_SIZE, + SCRUB_ENABLE_BACKGROUND, + SCRUB_MIN_CYCLE_DURATION, + SCRUB_MAX_CYCLE_DURATION, + SCRUB_CUR_CYCLE_DURATION, + SCRUB_MAX_ATTRS +}; + +struct edac_scrub_dev_attr { + struct device_attribute dev_attr; + u8 instance; +}; + +struct edac_scrub_context { + char name[EDAC_FEAT_NAME_LEN]; + struct edac_scrub_dev_attr scrub_dev_attr[SCRUB_MAX_ATTRS]; + struct attribute *scrub_attrs[SCRUB_MAX_ATTRS + 1]; + struct attribute_group group; +}; + +#define TO_SCRUB_DEV_ATTR(_dev_attr) \ + container_of(_dev_attr, struct edac_scrub_dev_attr, dev_attr) + +#define EDAC_SCRUB_ATTR_SHOW(attrib, cb, type, format) \ +static ssize_t attrib##_show(struct device *ras_feat_dev, \ + struct device_attribute *attr, char *buf) \ +{ \ + u8 inst = TO_SCRUB_DEV_ATTR(attr)->instance; \ + struct edac_dev_feat_ctx *ctx = dev_get_drvdata(ras_feat_dev); \ + const struct edac_scrub_ops *ops = ctx->scrub[inst].scrub_ops; \ + type data; \ + int ret; \ + \ + ret = ops->cb(ras_feat_dev->parent, ctx->scrub[inst].private, &data); \ + if (ret) \ + return ret; \ + \ + return sysfs_emit(buf, format, data); \ +} + +EDAC_SCRUB_ATTR_SHOW(addr, read_addr, u64, "0x%llx\n") +EDAC_SCRUB_ATTR_SHOW(size, read_size, u64, "0x%llx\n") +EDAC_SCRUB_ATTR_SHOW(enable_background, get_enabled_bg, bool, "%u\n") +EDAC_SCRUB_ATTR_SHOW(min_cycle_duration, get_min_cycle, u32, "%u\n") +EDAC_SCRUB_ATTR_SHOW(max_cycle_duration, get_max_cycle, u32, "%u\n") +EDAC_SCRUB_ATTR_SHOW(current_cycle_duration, get_cycle_duration, u32, "%u\n") + +#define EDAC_SCRUB_ATTR_STORE(attrib, cb, type, conv_func) \ +static ssize_t attrib##_store(struct device *ras_feat_dev, \ + struct device_attribute *attr, \ + const char *buf, size_t len) \ +{ \ + u8 inst = TO_SCRUB_DEV_ATTR(attr)->instance; \ + struct edac_dev_feat_ctx *ctx = dev_get_drvdata(ras_feat_dev); \ + const struct edac_scrub_ops *ops = ctx->scrub[inst].scrub_ops; \ + type data; \ + int ret; \ + \ + ret = conv_func(buf, 0, &data); \ + if (ret < 0) \ + return ret; \ + \ + ret = ops->cb(ras_feat_dev->parent, ctx->scrub[inst].private, data); \ + if (ret) \ + return ret; \ + \ + return len; \ +} + +EDAC_SCRUB_ATTR_STORE(addr, write_addr, u64, kstrtou64) +EDAC_SCRUB_ATTR_STORE(size, write_size, u64, kstrtou64) +EDAC_SCRUB_ATTR_STORE(enable_background, set_enabled_bg, unsigned long, kstrtoul) +EDAC_SCRUB_ATTR_STORE(current_cycle_duration, set_cycle_duration, unsigned long, kstrtoul) + +static umode_t scrub_attr_visible(struct kobject *kobj, struct attribute *a, int attr_id) +{ + struct device *ras_feat_dev = kobj_to_dev(kobj); + struct device_attribute *dev_attr = container_of(a, struct device_attribute, attr); + u8 inst = TO_SCRUB_DEV_ATTR(dev_attr)->instance; + struct edac_dev_feat_ctx *ctx = dev_get_drvdata(ras_feat_dev); + const struct edac_scrub_ops *ops = ctx->scrub[inst].scrub_ops; + + switch (attr_id) { + case SCRUB_ADDRESS: + if (ops->read_addr) { + if (ops->write_addr) + return a->mode; + else + return 0444; + } + break; + case SCRUB_SIZE: + if (ops->read_size) { + if (ops->write_size) + return a->mode; + else + return 0444; + } + break; + case SCRUB_ENABLE_BACKGROUND: + if (ops->get_enabled_bg) { + if (ops->set_enabled_bg) + return a->mode; + else + return 0444; + } + break; + case SCRUB_MIN_CYCLE_DURATION: + if (ops->get_min_cycle) + return a->mode; + break; + case SCRUB_MAX_CYCLE_DURATION: + if (ops->get_max_cycle) + return a->mode; + break; + case SCRUB_CUR_CYCLE_DURATION: + if (ops->get_cycle_duration) { + if (ops->set_cycle_duration) + return a->mode; + else + return 0444; + } + break; + default: + break; + } + + return 0; +} + +#define EDAC_SCRUB_ATTR_RO(_name, _instance) \ + ((struct edac_scrub_dev_attr) { .dev_attr = __ATTR_RO(_name), \ + .instance = _instance }) + +#define EDAC_SCRUB_ATTR_WO(_name, _instance) \ + ((struct edac_scrub_dev_attr) { .dev_attr = __ATTR_WO(_name), \ + .instance = _instance }) + +#define EDAC_SCRUB_ATTR_RW(_name, _instance) \ + ((struct edac_scrub_dev_attr) { .dev_attr = __ATTR_RW(_name), \ + .instance = _instance }) + +static int scrub_create_desc(struct device *scrub_dev, + const struct attribute_group **attr_groups, u8 instance) +{ + struct edac_scrub_context *scrub_ctx; + struct attribute_group *group; + int i; + struct edac_scrub_dev_attr dev_attr[] = { + [SCRUB_ADDRESS] = EDAC_SCRUB_ATTR_RW(addr, instance), + [SCRUB_SIZE] = EDAC_SCRUB_ATTR_RW(size, instance), + [SCRUB_ENABLE_BACKGROUND] = EDAC_SCRUB_ATTR_RW(enable_background, instance), + [SCRUB_MIN_CYCLE_DURATION] = EDAC_SCRUB_ATTR_RO(min_cycle_duration, instance), + [SCRUB_MAX_CYCLE_DURATION] = EDAC_SCRUB_ATTR_RO(max_cycle_duration, instance), + [SCRUB_CUR_CYCLE_DURATION] = EDAC_SCRUB_ATTR_RW(current_cycle_duration, instance) + }; + + scrub_ctx = devm_kzalloc(scrub_dev, sizeof(*scrub_ctx), GFP_KERNEL); + if (!scrub_ctx) + return -ENOMEM; + + group = &scrub_ctx->group; + for (i = 0; i < SCRUB_MAX_ATTRS; i++) { + memcpy(&scrub_ctx->scrub_dev_attr[i], &dev_attr[i], sizeof(dev_attr[i])); + scrub_ctx->scrub_attrs[i] = &scrub_ctx->scrub_dev_attr[i].dev_attr.attr; + } + sprintf(scrub_ctx->name, "%s%d", "scrub", instance); + group->name = scrub_ctx->name; + group->attrs = scrub_ctx->scrub_attrs; + group->is_visible = scrub_attr_visible; + + attr_groups[0] = group; + + return 0; +} + +/** + * edac_scrub_get_desc - get EDAC scrub descriptors + * @scrub_dev: client device, with scrub support + * @attr_groups: pointer to attribute group container + * @instance: device's scrub instance number. + * + * Return: + * * %0 - Success. + * * %-EINVAL - Invalid parameters passed. + * * %-ENOMEM - Dynamic memory allocation failed. + */ +int edac_scrub_get_desc(struct device *scrub_dev, + const struct attribute_group **attr_groups, u8 instance) +{ + if (!scrub_dev || !attr_groups) + return -EINVAL; + + return scrub_create_desc(scrub_dev, attr_groups, instance); +} diff --git a/include/linux/edac.h b/include/linux/edac.h index e19706311ec0..3620a09c0476 100644 --- a/include/linux/edac.h +++ b/include/linux/edac.h @@ -668,11 +668,43 @@ static inline struct dimm_info *edac_get_dimm(struct mem_ctl_info *mci, /* RAS feature type */ enum edac_dev_feat { + RAS_FEAT_SCRUB, RAS_FEAT_MAX }; +/** + * struct edac_scrub_ops - scrub device operations (all elements optional) + * @read_addr: read base address of scrubbing range. + * @read_size: read offset of scrubbing range. + * @write_addr: set base address of the scrubbing range. + * @write_size: set offset of the scrubbing range. + * @get_enabled_bg: check if currently performing background scrub. + * @set_enabled_bg: start or stop a bg-scrub. + * @get_min_cycle: get minimum supported scrub cycle duration in seconds. + * @get_max_cycle: get maximum supported scrub cycle duration in seconds. + * @get_cycle_duration: get current scrub cycle duration in seconds. + * @set_cycle_duration: set current scrub cycle duration in seconds. + */ +struct edac_scrub_ops { + int (*read_addr)(struct device *dev, void *drv_data, u64 *base); + int (*read_size)(struct device *dev, void *drv_data, u64 *size); + int (*write_addr)(struct device *dev, void *drv_data, u64 base); + int (*write_size)(struct device *dev, void *drv_data, u64 size); + int (*get_enabled_bg)(struct device *dev, void *drv_data, bool *enable); + int (*set_enabled_bg)(struct device *dev, void *drv_data, bool enable); + int (*get_min_cycle)(struct device *dev, void *drv_data, u32 *min); + int (*get_max_cycle)(struct device *dev, void *drv_data, u32 *max); + int (*get_cycle_duration)(struct device *dev, void *drv_data, u32 *cycle); + int (*set_cycle_duration)(struct device *dev, void *drv_data, u32 cycle); +}; + +int edac_scrub_get_desc(struct device *scrub_dev, + const struct attribute_group **attr_groups, + u8 instance); + /* EDAC device feature information structure */ struct edac_dev_data { + const struct edac_scrub_ops *scrub_ops; u8 instance; void *private; }; @@ -680,11 +712,13 @@ struct edac_dev_data { struct edac_dev_feat_ctx { struct device dev; void *private; + struct edac_dev_data *scrub; }; struct edac_dev_feature { enum edac_dev_feat ft_type; u8 instance; + const struct edac_scrub_ops *scrub_ops; void *ctx; }; From patchwork Fri Nov 1 09:17:21 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Shiju Jose X-Patchwork-Id: 13858976 Received: from frasgout.his.huawei.com (frasgout.his.huawei.com [185.176.79.56]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id B4C0915AAB6; Fri, 1 Nov 2024 09:17:59 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=185.176.79.56 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1730452683; cv=none; b=athl7bMR3ubbvab5wkeXfkxwk7rrxygK50l2DoSMri6IGyH+cPkopsAI8zT06ZLWpI6cYSNsBcLFtKnPmC5mwSrrjnsb+KW5IBDdOC34fA0V/ZSY0MTM+IfyoWNuvsQ3WCoN9in/43Ayu0edXSElXOAC1WW8Fd+/OxhlYA8R2Wo= ARC-Message-Signature: i=1; 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Fri, 1 Nov 2024 17:17:57 +0800 (CST) Received: from P_UKIT01-A7bmah.china.huawei.com (10.126.171.129) by frapeml500007.china.huawei.com (7.182.85.172) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.1.2507.39; Fri, 1 Nov 2024 10:17:55 +0100 From: To: , , , , CC: , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , Subject: [PATCH v15 03/15] EDAC: Add ECS control feature Date: Fri, 1 Nov 2024 09:17:21 +0000 Message-ID: <20241101091735.1465-4-shiju.jose@huawei.com> X-Mailer: git-send-email 2.43.0.windows.1 In-Reply-To: <20241101091735.1465-1-shiju.jose@huawei.com> References: <20241101091735.1465-1-shiju.jose@huawei.com> Precedence: bulk X-Mailing-List: linux-acpi@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-ClientProxiedBy: lhrpeml500004.china.huawei.com (7.191.163.9) To frapeml500007.china.huawei.com (7.182.85.172) From: Shiju Jose Add EDAC ECS (Error Check Scrub) control to manage a memory device's ECS feature. The Error Check Scrub (ECS) is a feature defined in JEDEC DDR5 SDRAM Specification (JESD79-5) and allows the DRAM to internally read, correct single-bit errors, and write back corrected data bits to the DRAM array while providing transparency to error counts. The DDR5 device contains number of memory media FRUs per device. The DDR5 ECS feature and thus the ECS control driver supports configuring the ECS parameters per FRU. Memory devices support the ECS feature register with the EDAC device driver, which retrieves the ECS descriptor from the EDAC ECS driver. This driver exposes sysfs ECS control attributes to userspace via /sys/bus/edac/devices//ecs_fruX/. The common sysfs ECS control interface abstracts the control of an arbitrary ECS functionality to a common set of functions. Support for the ECS feature is added separately because the control attributes of the DDR5 ECS feature differ from those of the scrub feature. The sysfs ECS attribute nodes are only present if the client driver has implemented the corresponding attribute callback function and passed the necessary operations to the EDAC RAS feature driver during registration. Co-developed-by: Jonathan Cameron Signed-off-by: Jonathan Cameron Signed-off-by: Shiju Jose --- Documentation/ABI/testing/sysfs-edac-ecs | 63 +++++++ drivers/edac/Makefile | 2 +- drivers/edac/ecs.c | 207 +++++++++++++++++++++++ drivers/edac/edac_device.c | 17 ++ include/linux/edac.h | 41 ++++- 5 files changed, 327 insertions(+), 3 deletions(-) create mode 100644 Documentation/ABI/testing/sysfs-edac-ecs create mode 100755 drivers/edac/ecs.c diff --git a/Documentation/ABI/testing/sysfs-edac-ecs b/Documentation/ABI/testing/sysfs-edac-ecs new file mode 100644 index 000000000000..ba0b3beba16d --- /dev/null +++ b/Documentation/ABI/testing/sysfs-edac-ecs @@ -0,0 +1,63 @@ +What: /sys/bus/edac/devices//ecs_fruX +Date: Jan 2025 +KernelVersion: 6.13 +Contact: linux-edac@vger.kernel.org +Description: + The sysfs EDAC bus devices //ecs_fruX subdirectory + pertains to the memory media ECS (Error Check Scrub) control + feature, where directory corresponds to a device + registered with the EDAC device driver for the ECS feature. + /ecs_fruX belongs to the media FRUs (Field Replaceable Unit) + under the memory device. + The sysfs ECS attr nodes are only present if the parent + driver has implemented the corresponding attr callback + function and provided the necessary operations to the EDAC + device driver during registration. + +What: /sys/bus/edac/devices//ecs_fruX/log_entry_type +Date: Jan 2025 +KernelVersion: 6.13 +Contact: linux-edac@vger.kernel.org +Description: + (RW) The log entry type of how the DDR5 ECS log is reported. + 0 - per DRAM. + 1 - per memory media FRU. + All other values are reserved. + +What: /sys/bus/edac/devices//ecs_fruX/mode +Date: Jan 2025 +KernelVersion: 6.13 +Contact: linux-edac@vger.kernel.org +Description: + (RW) The mode of how the DDR5 ECS counts the errors. + Error count is tracked based on two different modes + selected by DDR5 ECS Control Feature - Codeword mode and + Row Count mode. If the ECS is under Codeword mode, then + the error count increments each time a codeword with check + bit errors is detected. If the ECS is under Row Count mode, + then the error counter increments each time a row with + check bit errors is detected. + 0 - ECS counts rows in the memory media that have ECC errors. + 1 - ECS counts codewords with errors, specifically, it counts + the number of ECC-detected errors in the memory media. + All other values are reserved. + +What: /sys/bus/edac/devices//ecs_fruX/reset +Date: Jan 2025 +KernelVersion: 6.13 +Contact: linux-edac@vger.kernel.org +Description: + (WO) ECS reset ECC counter. + 1 - reset ECC counter to the default value. + All other values are reserved. + +What: /sys/bus/edac/devices//ecs_fruX/threshold +Date: Jan 2025 +KernelVersion: 6.13 +Contact: linux-edac@vger.kernel.org +Description: + (RW) DDR5 ECS threshold count per gigabits of memory cells. + The ECS error count is subject to the ECS Threshold count + per Gbit, which masks error counts less than the Threshold. + Supported values are 256, 1024 and 4096. + All other values are reserved. diff --git a/drivers/edac/Makefile b/drivers/edac/Makefile index 188501e676c7..b24c2c112d9c 100644 --- a/drivers/edac/Makefile +++ b/drivers/edac/Makefile @@ -10,7 +10,7 @@ obj-$(CONFIG_EDAC) := edac_core.o edac_core-y := edac_mc.o edac_device.o edac_mc_sysfs.o edac_core-y += edac_module.o edac_device_sysfs.o wq.o -edac_core-y += scrub.o +edac_core-y += scrub.o ecs.o edac_core-$(CONFIG_EDAC_DEBUG) += debugfs.o diff --git a/drivers/edac/ecs.c b/drivers/edac/ecs.c new file mode 100755 index 000000000000..dae8e5ae881b --- /dev/null +++ b/drivers/edac/ecs.c @@ -0,0 +1,207 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * The generic ECS driver is designed to support control of on-die error + * check scrub (e.g., DDR5 ECS). The common sysfs ECS interface abstracts + * the control of various ECS functionalities into a unified set of functions. + * + * Copyright (c) 2024 HiSilicon Limited. + */ + +#include + +#define EDAC_ECS_FRU_NAME "ecs_fru" + +enum edac_ecs_attributes { + ECS_LOG_ENTRY_TYPE, + ECS_MODE, + ECS_RESET, + ECS_THRESHOLD, + ECS_MAX_ATTRS +}; + +struct edac_ecs_dev_attr { + struct device_attribute dev_attr; + int fru_id; +}; + +struct edac_ecs_fru_context { + char name[EDAC_FEAT_NAME_LEN]; + struct edac_ecs_dev_attr dev_attr[ECS_MAX_ATTRS]; + struct attribute *ecs_attrs[ECS_MAX_ATTRS + 1]; + struct attribute_group group; +}; + +struct edac_ecs_context { + u16 num_media_frus; + struct edac_ecs_fru_context *fru_ctxs; +}; + +#define TO_ECS_DEV_ATTR(_dev_attr) \ + container_of(_dev_attr, struct edac_ecs_dev_attr, dev_attr) + +#define EDAC_ECS_ATTR_SHOW(attrib, cb, type, format) \ +static ssize_t attrib##_show(struct device *ras_feat_dev, \ + struct device_attribute *attr, char *buf) \ +{ \ + struct edac_ecs_dev_attr *dev_attr = TO_ECS_DEV_ATTR(attr); \ + struct edac_dev_feat_ctx *ctx = dev_get_drvdata(ras_feat_dev); \ + const struct edac_ecs_ops *ops = ctx->ecs.ecs_ops; \ + type data; \ + int ret; \ + \ + ret = ops->cb(ras_feat_dev->parent, ctx->ecs.private, \ + dev_attr->fru_id, &data); \ + if (ret) \ + return ret; \ + \ + return sysfs_emit(buf, format, data); \ +} + +EDAC_ECS_ATTR_SHOW(log_entry_type, get_log_entry_type, u32, "%u\n") +EDAC_ECS_ATTR_SHOW(mode, get_mode, u32, "%u\n") +EDAC_ECS_ATTR_SHOW(threshold, get_threshold, u32, "%u\n") + +#define EDAC_ECS_ATTR_STORE(attrib, cb, type, conv_func) \ +static ssize_t attrib##_store(struct device *ras_feat_dev, \ + struct device_attribute *attr, \ + const char *buf, size_t len) \ +{ \ + struct edac_ecs_dev_attr *dev_attr = TO_ECS_DEV_ATTR(attr); \ + struct edac_dev_feat_ctx *ctx = dev_get_drvdata(ras_feat_dev); \ + const struct edac_ecs_ops *ops = ctx->ecs.ecs_ops; \ + type data; \ + int ret; \ + \ + ret = conv_func(buf, 0, &data); \ + if (ret < 0) \ + return ret; \ + \ + ret = ops->cb(ras_feat_dev->parent, ctx->ecs.private, \ + dev_attr->fru_id, data); \ + if (ret) \ + return ret; \ + \ + return len; \ +} + +EDAC_ECS_ATTR_STORE(log_entry_type, set_log_entry_type, unsigned long, kstrtoul) +EDAC_ECS_ATTR_STORE(mode, set_mode, unsigned long, kstrtoul) +EDAC_ECS_ATTR_STORE(reset, reset, unsigned long, kstrtoul) +EDAC_ECS_ATTR_STORE(threshold, set_threshold, unsigned long, kstrtoul) + +static umode_t ecs_attr_visible(struct kobject *kobj, struct attribute *a, int attr_id) +{ + struct device *ras_feat_dev = kobj_to_dev(kobj); + struct edac_dev_feat_ctx *ctx = dev_get_drvdata(ras_feat_dev); + const struct edac_ecs_ops *ops = ctx->ecs.ecs_ops; + + switch (attr_id) { + case ECS_LOG_ENTRY_TYPE: + if (ops->get_log_entry_type) { + if (ops->set_log_entry_type) + return a->mode; + else + return 0444; + } + break; + case ECS_MODE: + if (ops->get_mode) { + if (ops->set_mode) + return a->mode; + else + return 0444; + } + break; + case ECS_RESET: + if (ops->reset) + return a->mode; + break; + case ECS_THRESHOLD: + if (ops->get_threshold) { + if (ops->set_threshold) + return a->mode; + else + return 0444; + } + break; + default: + break; + } + + return 0; +} + +#define EDAC_ECS_ATTR_RO(_name, _fru_id) \ + ((struct edac_ecs_dev_attr) { .dev_attr = __ATTR_RO(_name), \ + .fru_id = _fru_id }) + +#define EDAC_ECS_ATTR_WO(_name, _fru_id) \ + ((struct edac_ecs_dev_attr) { .dev_attr = __ATTR_WO(_name), \ + .fru_id = _fru_id }) + +#define EDAC_ECS_ATTR_RW(_name, _fru_id) \ + ((struct edac_ecs_dev_attr) { .dev_attr = __ATTR_RW(_name), \ + .fru_id = _fru_id }) + +static int ecs_create_desc(struct device *ecs_dev, + const struct attribute_group **attr_groups, u16 num_media_frus) +{ + struct edac_ecs_context *ecs_ctx; + u32 fru; + + ecs_ctx = devm_kzalloc(ecs_dev, sizeof(*ecs_ctx), GFP_KERNEL); + if (!ecs_ctx) + return -ENOMEM; + + ecs_ctx->num_media_frus = num_media_frus; + ecs_ctx->fru_ctxs = devm_kcalloc(ecs_dev, num_media_frus, + sizeof(*ecs_ctx->fru_ctxs), + GFP_KERNEL); + if (!ecs_ctx->fru_ctxs) + return -ENOMEM; + + for (fru = 0; fru < num_media_frus; fru++) { + struct edac_ecs_fru_context *fru_ctx = &ecs_ctx->fru_ctxs[fru]; + struct attribute_group *group = &fru_ctx->group; + int i; + + fru_ctx->dev_attr[ECS_LOG_ENTRY_TYPE] = + EDAC_ECS_ATTR_RW(log_entry_type, fru); + fru_ctx->dev_attr[ECS_MODE] = EDAC_ECS_ATTR_RW(mode, fru); + fru_ctx->dev_attr[ECS_RESET] = EDAC_ECS_ATTR_WO(reset, fru); + fru_ctx->dev_attr[ECS_THRESHOLD] = + EDAC_ECS_ATTR_RW(threshold, fru); + + for (i = 0; i < ECS_MAX_ATTRS; i++) + fru_ctx->ecs_attrs[i] = &fru_ctx->dev_attr[i].dev_attr.attr; + + sprintf(fru_ctx->name, "%s%d", EDAC_ECS_FRU_NAME, fru); + group->name = fru_ctx->name; + group->attrs = fru_ctx->ecs_attrs; + group->is_visible = ecs_attr_visible; + + attr_groups[fru] = group; + } + + return 0; +} + +/** + * edac_ecs_get_desc - get EDAC ECS descriptors + * @ecs_dev: client device, supports ECS feature + * @attr_groups: pointer to attribute group container + * @num_media_frus: number of media FRUs in the device + * + * Return: + * * %0 - Success. + * * %-EINVAL - Invalid parameters passed. + * * %-ENOMEM - Dynamic memory allocation failed. + */ +int edac_ecs_get_desc(struct device *ecs_dev, + const struct attribute_group **attr_groups, u16 num_media_frus) +{ + if (!ecs_dev || !attr_groups || !num_media_frus) + return -EINVAL; + + return ecs_create_desc(ecs_dev, attr_groups, num_media_frus); +} diff --git a/drivers/edac/edac_device.c b/drivers/edac/edac_device.c index cd700a64406e..bbf5b52a1ce1 100644 --- a/drivers/edac/edac_device.c +++ b/drivers/edac/edac_device.c @@ -626,6 +626,9 @@ int edac_dev_register(struct device *parent, char *name, attr_gcnt++; scrub_cnt++; break; + case RAS_FEAT_ECS: + attr_gcnt += ras_features[feat].ecs_info.num_media_frus; + break; default: return -EINVAL; } @@ -669,6 +672,20 @@ int edac_dev_register(struct device *parent, char *name, scrub_inst++; attr_gcnt++; break; + case RAS_FEAT_ECS: + if (!ras_features->ecs_ops) + goto data_mem_free; + + dev_data = &ctx->ecs; + dev_data->ecs_ops = ras_features->ecs_ops; + dev_data->private = ras_features->ctx; + ret = edac_ecs_get_desc(parent, &ras_attr_groups[attr_gcnt], + ras_features->ecs_info.num_media_frus); + if (ret) + goto data_mem_free; + + attr_gcnt += ras_features->ecs_info.num_media_frus; + break; default: ret = -EINVAL; goto data_mem_free; diff --git a/include/linux/edac.h b/include/linux/edac.h index 3620a09c0476..04385b1a9283 100644 --- a/include/linux/edac.h +++ b/include/linux/edac.h @@ -669,6 +669,7 @@ static inline struct dimm_info *edac_get_dimm(struct mem_ctl_info *mci, /* RAS feature type */ enum edac_dev_feat { RAS_FEAT_SCRUB, + RAS_FEAT_ECS, RAS_FEAT_MAX }; @@ -702,9 +703,40 @@ int edac_scrub_get_desc(struct device *scrub_dev, const struct attribute_group **attr_groups, u8 instance); +/** + * struct edac_ecs_ops - ECS device operations (all elements optional) + * @get_log_entry_type: read the log entry type value. + * @set_log_entry_type: set the log entry type value. + * @get_mode: read the mode value. + * @set_mode: set the mode value. + * @reset: reset the ECS counter. + * @get_threshold: read the threshold count per gigabits of memory cells. + * @set_threshold: set the threshold count per gigabits of memory cells. + */ +struct edac_ecs_ops { + int (*get_log_entry_type)(struct device *dev, void *drv_data, int fru_id, u32 *val); + int (*set_log_entry_type)(struct device *dev, void *drv_data, int fru_id, u32 val); + int (*get_mode)(struct device *dev, void *drv_data, int fru_id, u32 *val); + int (*set_mode)(struct device *dev, void *drv_data, int fru_id, u32 val); + int (*reset)(struct device *dev, void *drv_data, int fru_id, u32 val); + int (*get_threshold)(struct device *dev, void *drv_data, int fru_id, u32 *threshold); + int (*set_threshold)(struct device *dev, void *drv_data, int fru_id, u32 threshold); +}; + +struct edac_ecs_ex_info { + u16 num_media_frus; +}; + +int edac_ecs_get_desc(struct device *ecs_dev, + const struct attribute_group **attr_groups, + u16 num_media_frus); + /* EDAC device feature information structure */ struct edac_dev_data { - const struct edac_scrub_ops *scrub_ops; + union { + const struct edac_scrub_ops *scrub_ops; + const struct edac_ecs_ops *ecs_ops; + }; u8 instance; void *private; }; @@ -713,13 +745,18 @@ struct edac_dev_feat_ctx { struct device dev; void *private; struct edac_dev_data *scrub; + struct edac_dev_data ecs; }; struct edac_dev_feature { enum edac_dev_feat ft_type; u8 instance; - const struct edac_scrub_ops *scrub_ops; + union { + const struct edac_scrub_ops *scrub_ops; + const struct edac_ecs_ops *ecs_ops; + }; void *ctx; + struct edac_ecs_ex_info ecs_info; }; int edac_dev_register(struct device *parent, char *dev_name, From patchwork Fri Nov 1 09:17:22 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Shiju Jose X-Patchwork-Id: 13858977 Received: from frasgout.his.huawei.com (frasgout.his.huawei.com [185.176.79.56]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 7D3D3156883; Fri, 1 Nov 2024 09:18:02 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=185.176.79.56 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1730452685; cv=none; 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Fri, 1 Nov 2024 17:13:06 +0800 (CST) Received: from frapeml500007.china.huawei.com (unknown [7.182.85.172]) by mail.maildlp.com (Postfix) with ESMTPS id A30AD140D1D; Fri, 1 Nov 2024 17:18:00 +0800 (CST) Received: from P_UKIT01-A7bmah.china.huawei.com (10.126.171.129) by frapeml500007.china.huawei.com (7.182.85.172) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.1.2507.39; Fri, 1 Nov 2024 10:17:58 +0100 From: To: , , , , CC: , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , Subject: [PATCH v15 04/15] cxl: Add Get Supported Features command for kernel usage Date: Fri, 1 Nov 2024 09:17:22 +0000 Message-ID: <20241101091735.1465-5-shiju.jose@huawei.com> X-Mailer: git-send-email 2.43.0.windows.1 In-Reply-To: <20241101091735.1465-1-shiju.jose@huawei.com> References: <20241101091735.1465-1-shiju.jose@huawei.com> Precedence: bulk X-Mailing-List: linux-acpi@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-ClientProxiedBy: lhrpeml500004.china.huawei.com (7.191.163.9) To frapeml500007.china.huawei.com (7.182.85.172) From: Dave Jiang CXL spec r3.1 8.2.9.6.1 Get Supported Features (Opcode 0500h) The command retrieve the list of supported device-specific features (identified by UUID) and general information about each Feature. The driver will retrieve the feature entries in order to make checks and provide information for the Get Feature and Set Feature command. One of the main piece of information retrieved are the effects a Set Feature command would have for a particular feature. Reviewed-by: Jonathan Cameron Signed-off-by: Dave Jiang Co-developed-by: Shiju Jose Signed-off-by: Shiju Jose --- drivers/cxl/core/mbox.c | 175 +++++++++++++++++++++++++++++++++++ drivers/cxl/cxlmem.h | 47 ++++++++++ drivers/cxl/pci.c | 4 + include/cxl/mailbox.h | 4 + include/uapi/linux/cxl_mem.h | 1 + 5 files changed, 231 insertions(+) diff --git a/drivers/cxl/core/mbox.c b/drivers/cxl/core/mbox.c index 5175138c4fb7..5045960e3bfe 100644 --- a/drivers/cxl/core/mbox.c +++ b/drivers/cxl/core/mbox.c @@ -67,6 +67,7 @@ static struct cxl_mem_command cxl_mem_commands[CXL_MEM_COMMAND_ID_MAX] = { CXL_CMD(SET_SHUTDOWN_STATE, 0x1, 0, 0), CXL_CMD(GET_SCAN_MEDIA_CAPS, 0x10, 0x4, 0), CXL_CMD(GET_TIMESTAMP, 0, 0x8, 0), + CXL_CMD(GET_SUPPORTED_FEATURES, 0x8, CXL_VARIABLE_PAYLOAD, 0), }; /* @@ -795,6 +796,180 @@ static const uuid_t log_uuid[] = { [VENDOR_DEBUG_UUID] = DEFINE_CXL_VENDOR_DEBUG_UUID, }; +static void cxl_free_features(void *features) +{ + kvfree(features); +} + +static int cxl_get_supported_features_count(struct cxl_dev_state *cxlds) +{ + struct cxl_mailbox *cxl_mbox = &cxlds->cxl_mbox; + struct cxl_mbox_get_sup_feats_out mbox_out; + struct cxl_mbox_get_sup_feats_in mbox_in; + struct cxl_mbox_cmd mbox_cmd; + int rc; + + memset(&mbox_in, 0, sizeof(mbox_in)); + mbox_in.count = sizeof(mbox_out); + memset(&mbox_out, 0, sizeof(mbox_out)); + mbox_cmd = (struct cxl_mbox_cmd) { + .opcode = CXL_MBOX_OP_GET_SUPPORTED_FEATURES, + .size_in = sizeof(mbox_in), + .payload_in = &mbox_in, + .size_out = sizeof(mbox_out), + .payload_out = &mbox_out, + .min_out = sizeof(mbox_out), + }; + rc = cxl_internal_send_cmd(cxl_mbox, &mbox_cmd); + if (rc < 0) + return rc; + + cxl_mbox->num_features = le16_to_cpu(mbox_out.supported_feats); + if (!cxl_mbox->num_features) + return -ENOENT; + + return 0; +} + +int cxl_get_supported_features(struct cxl_memdev_state *mds) +{ + int remain_feats, max_size, max_feats, start, rc; + struct cxl_dev_state *cxlds = &mds->cxlds; + struct cxl_mailbox *cxl_mbox = &cxlds->cxl_mbox; + int feat_size = sizeof(struct cxl_feat_entry); + struct cxl_mbox_get_sup_feats_out *mbox_out; + struct cxl_mbox_get_sup_feats_in mbox_in; + int hdr_size = sizeof(*mbox_out); + struct cxl_mbox_cmd mbox_cmd; + struct cxl_mem_command *cmd; + void *ptr; + + /* Get supported features is optional, need to check */ + cmd = cxl_mem_find_command(CXL_MBOX_OP_GET_SUPPORTED_FEATURES); + if (!cmd) + return -EOPNOTSUPP; + if (!test_bit(cmd->info.id, mds->enabled_cmds)) + return -EOPNOTSUPP; + + rc = cxl_get_supported_features_count(cxlds); + if (rc) + return rc; + + struct cxl_feat_entry *entries __free(kvfree) = + kvmalloc(cxl_mbox->num_features * feat_size, GFP_KERNEL); + + if (!entries) + return -ENOMEM; + + cxl_mbox->entries = no_free_ptr(entries); + rc = devm_add_action_or_reset(cxl_mbox->host, cxl_free_features, + cxl_mbox->entries); + if (rc) + return rc; + + max_size = cxl_mbox->payload_size - hdr_size; + /* max feat entries that can fit in mailbox max payload size */ + max_feats = max_size / feat_size; + ptr = &cxl_mbox->entries[0]; + + mbox_out = kvmalloc(cxl_mbox->payload_size, GFP_KERNEL); + if (!mbox_out) + return -ENOMEM; + + start = 0; + remain_feats = cxl_mbox->num_features; + do { + int retrieved, alloc_size, copy_feats; + + if (remain_feats > max_feats) { + alloc_size = sizeof(*mbox_out) + max_feats * feat_size; + remain_feats = remain_feats - max_feats; + copy_feats = max_feats; + } else { + alloc_size = sizeof(*mbox_out) + remain_feats * feat_size; + copy_feats = remain_feats; + remain_feats = 0; + } + + memset(&mbox_in, 0, sizeof(mbox_in)); + mbox_in.count = alloc_size; + mbox_in.start_idx = start; + memset(mbox_out, 0, alloc_size); + mbox_cmd = (struct cxl_mbox_cmd) { + .opcode = CXL_MBOX_OP_GET_SUPPORTED_FEATURES, + .size_in = sizeof(mbox_in), + .payload_in = &mbox_in, + .size_out = alloc_size, + .payload_out = mbox_out, + .min_out = hdr_size, + }; + rc = cxl_internal_send_cmd(cxl_mbox, &mbox_cmd); + if (rc < 0) + goto err; + if (mbox_cmd.size_out <= hdr_size) { + rc = -ENXIO; + goto err; + } + + /* + * Make sure retrieved out buffer is multiple of feature + * entries. + */ + retrieved = mbox_cmd.size_out - hdr_size; + if (retrieved % feat_size) { + rc = -ENXIO; + goto err; + } + + /* + * If the reported output entries * defined entry size != + * retrieved output bytes, then the output package is incorrect. + */ + if (mbox_out->num_entries * feat_size != retrieved) { + rc = -ENXIO; + goto err; + } + + memcpy(ptr, mbox_out->ents, retrieved); + ptr += retrieved; + /* + * If the number of output entries is less than expected, add the + * remaining entries to the next batch. + */ + remain_feats += copy_feats - mbox_out->num_entries; + start += mbox_out->num_entries; + } while (remain_feats); + + kfree(mbox_out); + return 0; + +err: + kfree(mbox_out); + cxl_mbox->num_features = 0; + return rc; +} +EXPORT_SYMBOL_NS_GPL(cxl_get_supported_features, CXL); + +int cxl_get_supported_feature_entry(struct cxl_memdev_state *mds, const uuid_t *feat_uuid, + struct cxl_feat_entry *feat_entry_out) +{ + struct cxl_dev_state *cxlds = &mds->cxlds; + struct cxl_feat_entry *feat_entry; + int count; + + /* Check CXL dev supports the feature */ + feat_entry = &cxlds->cxl_mbox.entries[0]; + for (count = 0; count < cxlds->cxl_mbox.num_features; count++, feat_entry++) { + if (uuid_equal(&feat_entry->uuid, feat_uuid)) { + memcpy(feat_entry_out, feat_entry, sizeof(*feat_entry_out)); + return 0; + } + } + + return -EOPNOTSUPP; +} +EXPORT_SYMBOL_NS_GPL(cxl_get_supported_feature_entry, CXL); + /** * cxl_enumerate_cmds() - Enumerate commands for a device. * @mds: The driver data for the operation diff --git a/drivers/cxl/cxlmem.h b/drivers/cxl/cxlmem.h index 2a25d1957ddb..f88b10188632 100644 --- a/drivers/cxl/cxlmem.h +++ b/drivers/cxl/cxlmem.h @@ -530,6 +530,7 @@ enum cxl_opcode { CXL_MBOX_OP_GET_LOG_CAPS = 0x0402, CXL_MBOX_OP_CLEAR_LOG = 0x0403, CXL_MBOX_OP_GET_SUP_LOG_SUBLIST = 0x0405, + CXL_MBOX_OP_GET_SUPPORTED_FEATURES = 0x0500, CXL_MBOX_OP_IDENTIFY = 0x4000, CXL_MBOX_OP_GET_PARTITION_INFO = 0x4100, CXL_MBOX_OP_SET_PARTITION_INFO = 0x4101, @@ -813,6 +814,48 @@ enum { CXL_PMEM_SEC_PASS_USER, }; +/* Get Supported Features (0x500h) CXL r3.1 8.2.9.6.1 */ +struct cxl_mbox_get_sup_feats_in { + __le32 count; + __le16 start_idx; + u8 reserved[2]; +} __packed; + +/* Supported Feature Entry : Payload out attribute flags */ +#define CXL_FEAT_ENTRY_FLAG_CHANGABLE BIT(0) +#define CXL_FEAT_ENTRY_FLAG_DEEPEST_RESET_PERSISTENCE_MASK GENMASK(3, 1) +#define CXL_FEAT_ENTRY_FLAG_PERSIST_ACROSS_FIRMWARE_UPDATE BIT(4) +#define CXL_FEAT_ENTRY_FLAG_SUPPORT_DEFAULT_SELECTION BIT(5) +#define CXL_FEAT_ENTRY_FLAG_SUPPORT_SAVED_SELECTION BIT(6) + +enum cxl_feat_attr_value_persistence { + CXL_FEAT_ATTR_VALUE_PERSISTENCE_NONE, + CXL_FEAT_ATTR_VALUE_PERSISTENCE_CXL_RESET, + CXL_FEAT_ATTR_VALUE_PERSISTENCE_HOT_RESET, + CXL_FEAT_ATTR_VALUE_PERSISTENCE_WARM_RESET, + CXL_FEAT_ATTR_VALUE_PERSISTENCE_COLD_RESET, + CXL_FEAT_ATTR_VALUE_PERSISTENCE_MAX +}; + +struct cxl_feat_entry { + uuid_t uuid; + __le16 id; + __le16 get_feat_size; + __le16 set_feat_size; + __le32 attr_flags; + u8 get_feat_ver; + u8 set_feat_ver; + __le16 set_effects; + u8 reserved[18]; +} __packed; + +struct cxl_mbox_get_sup_feats_out { + __le16 num_entries; + __le16 supported_feats; + u8 reserved[4]; + struct cxl_feat_entry ents[] __counted_by_le(supported_feats); +} __packed; + int cxl_internal_send_cmd(struct cxl_mailbox *cxl_mbox, struct cxl_mbox_cmd *cmd); int cxl_dev_state_identify(struct cxl_memdev_state *mds); @@ -872,4 +915,8 @@ struct cxl_hdm { struct seq_file; struct dentry *cxl_debugfs_create_dir(const char *dir); void cxl_dpa_debug(struct seq_file *file, struct cxl_dev_state *cxlds); + +int cxl_get_supported_features(struct cxl_memdev_state *mds); +int cxl_get_supported_feature_entry(struct cxl_memdev_state *mds, const uuid_t *feat_uuid, + struct cxl_feat_entry *feat_entry_out); #endif /* __CXL_MEM_H__ */ diff --git a/drivers/cxl/pci.c b/drivers/cxl/pci.c index 188412d45e0d..5c2926eec3c3 100644 --- a/drivers/cxl/pci.c +++ b/drivers/cxl/pci.c @@ -887,6 +887,10 @@ static int cxl_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id) if (rc) return rc; + rc = cxl_get_supported_features(mds); + if (rc) + dev_dbg(&pdev->dev, "No features enumerated.\n"); + rc = cxl_set_timestamp(mds); if (rc) return rc; diff --git a/include/cxl/mailbox.h b/include/cxl/mailbox.h index bacd111e75f1..cc66afec3473 100644 --- a/include/cxl/mailbox.h +++ b/include/cxl/mailbox.h @@ -14,6 +14,8 @@ struct cxl_mbox_cmd; * @mbox_mutex: mutex protects device mailbox and firmware * @mbox_wait: rcuwait for mailbox * @mbox_send: @dev specific transport for transmitting mailbox commands + * @num_features: number of supported features + * @entries: list of supported feature entries. */ struct cxl_mailbox { struct device *host; @@ -21,6 +23,8 @@ struct cxl_mailbox { struct mutex mbox_mutex; /* lock to protect mailbox context */ struct rcuwait mbox_wait; int (*mbox_send)(struct cxl_mailbox *cxl_mbox, struct cxl_mbox_cmd *cmd); + int num_features; + struct cxl_feat_entry *entries; }; int cxl_mailbox_init(struct cxl_mailbox *cxl_mbox, struct device *host); diff --git a/include/uapi/linux/cxl_mem.h b/include/uapi/linux/cxl_mem.h index c6c0fe27495d..bd2535962f70 100644 --- a/include/uapi/linux/cxl_mem.h +++ b/include/uapi/linux/cxl_mem.h @@ -50,6 +50,7 @@ ___C(GET_LOG_CAPS, "Get Log Capabilities"), \ ___C(CLEAR_LOG, "Clear Log"), \ ___C(GET_SUP_LOG_SUBLIST, "Get Supported Logs Sub-List"), \ + ___C(GET_SUPPORTED_FEATURES, "Get Supported Features"), \ ___C(MAX, "invalid / last command") #define ___C(a, b) CXL_MEM_COMMAND_ID_##a From patchwork Fri Nov 1 09:17:23 2024 Content-Type: text/plain; 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Fri, 1 Nov 2024 10:18:01 +0100 From: To: , , , , CC: , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , Subject: [PATCH v15 05/15] cxl/mbox: Add GET_FEATURE mailbox command Date: Fri, 1 Nov 2024 09:17:23 +0000 Message-ID: <20241101091735.1465-6-shiju.jose@huawei.com> X-Mailer: git-send-email 2.43.0.windows.1 In-Reply-To: <20241101091735.1465-1-shiju.jose@huawei.com> References: <20241101091735.1465-1-shiju.jose@huawei.com> Precedence: bulk X-Mailing-List: linux-acpi@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-ClientProxiedBy: lhrpeml500004.china.huawei.com (7.191.163.9) To frapeml500007.china.huawei.com (7.182.85.172) From: Shiju Jose Add support for GET_FEATURE mailbox command. CXL spec 3.1 section 8.2.9.6 describes optional device specific features. The settings of a feature can be retrieved using Get Feature command. CXL spec 3.1 section 8.2.9.6.2 describes Get Feature command. Reviewed-by: Fan Ni Reviewed-by: Jonathan Cameron Reviewed-by: Dave Jiang Signed-off-by: Shiju Jose --- drivers/cxl/core/mbox.c | 41 +++++++++++++++++++++++++++++++++++++++++ drivers/cxl/cxlmem.h | 26 ++++++++++++++++++++++++++ 2 files changed, 67 insertions(+) diff --git a/drivers/cxl/core/mbox.c b/drivers/cxl/core/mbox.c index 5045960e3bfe..3cd4bce2872d 100644 --- a/drivers/cxl/core/mbox.c +++ b/drivers/cxl/core/mbox.c @@ -970,6 +970,47 @@ int cxl_get_supported_feature_entry(struct cxl_memdev_state *mds, const uuid_t * } EXPORT_SYMBOL_NS_GPL(cxl_get_supported_feature_entry, CXL); +size_t cxl_get_feature(struct cxl_memdev_state *mds, const uuid_t feat_uuid, + enum cxl_get_feat_selection selection, + void *feat_out, size_t feat_out_size) +{ + struct cxl_mailbox *cxl_mbox = &mds->cxlds.cxl_mbox; + size_t data_to_rd_size, size_out; + struct cxl_mbox_get_feat_in pi; + struct cxl_mbox_cmd mbox_cmd; + size_t data_rcvd_size = 0; + int rc; + + if (!feat_out || !feat_out_size) + return 0; + + size_out = min(feat_out_size, cxl_mbox->payload_size); + pi.uuid = feat_uuid; + pi.selection = selection; + do { + data_to_rd_size = min(feat_out_size - data_rcvd_size, + cxl_mbox->payload_size); + pi.offset = cpu_to_le16(data_rcvd_size); + pi.count = cpu_to_le16(data_to_rd_size); + + mbox_cmd = (struct cxl_mbox_cmd) { + .opcode = CXL_MBOX_OP_GET_FEATURE, + .size_in = sizeof(pi), + .payload_in = &pi, + .size_out = size_out, + .payload_out = feat_out + data_rcvd_size, + .min_out = data_to_rd_size, + }; + rc = cxl_internal_send_cmd(cxl_mbox, &mbox_cmd); + if (rc < 0 || !mbox_cmd.size_out) + return 0; + data_rcvd_size += mbox_cmd.size_out; + } while (data_rcvd_size < feat_out_size); + + return data_rcvd_size; +} +EXPORT_SYMBOL_NS_GPL(cxl_get_feature, CXL); + /** * cxl_enumerate_cmds() - Enumerate commands for a device. * @mds: The driver data for the operation diff --git a/drivers/cxl/cxlmem.h b/drivers/cxl/cxlmem.h index f88b10188632..0c152719669a 100644 --- a/drivers/cxl/cxlmem.h +++ b/drivers/cxl/cxlmem.h @@ -531,6 +531,7 @@ enum cxl_opcode { CXL_MBOX_OP_CLEAR_LOG = 0x0403, CXL_MBOX_OP_GET_SUP_LOG_SUBLIST = 0x0405, CXL_MBOX_OP_GET_SUPPORTED_FEATURES = 0x0500, + CXL_MBOX_OP_GET_FEATURE = 0x0501, CXL_MBOX_OP_IDENTIFY = 0x4000, CXL_MBOX_OP_GET_PARTITION_INFO = 0x4100, CXL_MBOX_OP_SET_PARTITION_INFO = 0x4101, @@ -856,6 +857,28 @@ struct cxl_mbox_get_sup_feats_out { struct cxl_feat_entry ents[] __counted_by_le(supported_feats); } __packed; +/* + * Get Feature CXL 3.1 Spec 8.2.9.6.2 + */ + +/* + * Get Feature input payload + * CXL rev 3.1 section 8.2.9.6.2 Table 8-99 + */ +enum cxl_get_feat_selection { + CXL_GET_FEAT_SEL_CURRENT_VALUE, + CXL_GET_FEAT_SEL_DEFAULT_VALUE, + CXL_GET_FEAT_SEL_SAVED_VALUE, + CXL_GET_FEAT_SEL_MAX +}; + +struct cxl_mbox_get_feat_in { + uuid_t uuid; + __le16 offset; + __le16 count; + u8 selection; +} __packed; + int cxl_internal_send_cmd(struct cxl_mailbox *cxl_mbox, struct cxl_mbox_cmd *cmd); int cxl_dev_state_identify(struct cxl_memdev_state *mds); @@ -919,4 +942,7 @@ void cxl_dpa_debug(struct seq_file *file, struct cxl_dev_state *cxlds); int cxl_get_supported_features(struct cxl_memdev_state *mds); int cxl_get_supported_feature_entry(struct cxl_memdev_state *mds, const uuid_t *feat_uuid, struct cxl_feat_entry *feat_entry_out); +size_t cxl_get_feature(struct cxl_memdev_state *mds, const uuid_t feat_uuid, + enum cxl_get_feat_selection selection, + void *feat_out, size_t feat_out_size); #endif /* __CXL_MEM_H__ */ From patchwork Fri Nov 1 09:17:24 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Shiju Jose X-Patchwork-Id: 13858979 Received: from frasgout.his.huawei.com (frasgout.his.huawei.com [185.176.79.56]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 463F71925A9; Fri, 1 Nov 2024 09:18:09 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=185.176.79.56 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1730452691; cv=none; b=K3l4iQ9zPBTVyRCOLjtgYAAtvdW7MYZD6IhPWMz4Dg1+eUALXKbcLmbdUcBeTcFY/o7RvBy/1237vVziscB0V6cNuH3pVaG94LuAee7eT7v2BkaZGG3q0uOLJd6+E4QS0mXcf9k7/+bLIRz4ITsfbbpsHGmHITfJxV6evaslOyY= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1730452691; c=relaxed/simple; bh=GZDBKRY/r2JAAZBQJKg1D8Adsis4pMVuMCR8H2t79Uk=; 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Fri, 1 Nov 2024 10:18:04 +0100 From: To: , , , , CC: , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , Subject: [PATCH v15 06/15] cxl/mbox: Add SET_FEATURE mailbox command Date: Fri, 1 Nov 2024 09:17:24 +0000 Message-ID: <20241101091735.1465-7-shiju.jose@huawei.com> X-Mailer: git-send-email 2.43.0.windows.1 In-Reply-To: <20241101091735.1465-1-shiju.jose@huawei.com> References: <20241101091735.1465-1-shiju.jose@huawei.com> Precedence: bulk X-Mailing-List: linux-acpi@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-ClientProxiedBy: lhrpeml500004.china.huawei.com (7.191.163.9) To frapeml500007.china.huawei.com (7.182.85.172) From: Shiju Jose Add support for SET_FEATURE mailbox command. CXL spec 3.1 section 8.2.9.6 describes optional device specific features. CXL devices support features with changeable attributes. The settings of a feature can be optionally modified using Set Feature command. CXL spec 3.1 section 8.2.9.6.3 describes Set Feature command. Reviewed-by: Jonathan Cameron Reviewed-by: Dave Jiang Signed-off-by: Shiju Jose --- drivers/cxl/core/mbox.c | 73 +++++++++++++++++++++++++++++++++++++++++ drivers/cxl/cxlmem.h | 34 +++++++++++++++++++ 2 files changed, 107 insertions(+) diff --git a/drivers/cxl/core/mbox.c b/drivers/cxl/core/mbox.c index 3cd4bce2872d..4b9e62de164b 100644 --- a/drivers/cxl/core/mbox.c +++ b/drivers/cxl/core/mbox.c @@ -1011,6 +1011,79 @@ size_t cxl_get_feature(struct cxl_memdev_state *mds, const uuid_t feat_uuid, } EXPORT_SYMBOL_NS_GPL(cxl_get_feature, CXL); +/* + * FEAT_DATA_MIN_PAYLOAD_SIZE - min extra number of bytes should be + * available in the mailbox for storing the actual feature data so that + * the feature data transfer would work as expected. + */ +#define FEAT_DATA_MIN_PAYLOAD_SIZE 10 +int cxl_set_feature(struct cxl_memdev_state *mds, + const uuid_t feat_uuid, u8 feat_version, + void *feat_data, size_t feat_data_size, + u8 feat_flag) +{ + struct cxl_mailbox *cxl_mbox = &mds->cxlds.cxl_mbox; + struct cxl_memdev_set_feat_pi { + struct cxl_mbox_set_feat_hdr hdr; + u8 feat_data[]; + } __packed; + size_t data_in_size, data_sent_size = 0; + struct cxl_mbox_cmd mbox_cmd; + size_t hdr_size; + int rc = 0; + + struct cxl_memdev_set_feat_pi *pi __free(kfree) = + kmalloc(cxl_mbox->payload_size, GFP_KERNEL); + pi->hdr.uuid = feat_uuid; + pi->hdr.version = feat_version; + feat_flag &= ~CXL_SET_FEAT_FLAG_DATA_TRANSFER_MASK; + feat_flag |= CXL_SET_FEAT_FLAG_DATA_SAVED_ACROSS_RESET; + hdr_size = sizeof(pi->hdr); + /* + * Check minimum mbox payload size is available for + * the feature data transfer. + */ + if (hdr_size + FEAT_DATA_MIN_PAYLOAD_SIZE > cxl_mbox->payload_size) + return -ENOMEM; + + if ((hdr_size + feat_data_size) <= cxl_mbox->payload_size) { + pi->hdr.flags = cpu_to_le32(feat_flag | + CXL_SET_FEAT_FLAG_FULL_DATA_TRANSFER); + data_in_size = feat_data_size; + } else { + pi->hdr.flags = cpu_to_le32(feat_flag | + CXL_SET_FEAT_FLAG_INITIATE_DATA_TRANSFER); + data_in_size = cxl_mbox->payload_size - hdr_size; + } + + do { + pi->hdr.offset = cpu_to_le16(data_sent_size); + memcpy(pi->feat_data, feat_data + data_sent_size, data_in_size); + mbox_cmd = (struct cxl_mbox_cmd) { + .opcode = CXL_MBOX_OP_SET_FEATURE, + .size_in = hdr_size + data_in_size, + .payload_in = pi, + }; + rc = cxl_internal_send_cmd(cxl_mbox, &mbox_cmd); + if (rc < 0) + return rc; + + data_sent_size += data_in_size; + if (data_sent_size >= feat_data_size) + return 0; + + if ((feat_data_size - data_sent_size) <= (cxl_mbox->payload_size - hdr_size)) { + data_in_size = feat_data_size - data_sent_size; + pi->hdr.flags = cpu_to_le32(feat_flag | + CXL_SET_FEAT_FLAG_FINISH_DATA_TRANSFER); + } else { + pi->hdr.flags = cpu_to_le32(feat_flag | + CXL_SET_FEAT_FLAG_CONTINUE_DATA_TRANSFER); + } + } while (true); +} +EXPORT_SYMBOL_NS_GPL(cxl_set_feature, CXL); + /** * cxl_enumerate_cmds() - Enumerate commands for a device. * @mds: The driver data for the operation diff --git a/drivers/cxl/cxlmem.h b/drivers/cxl/cxlmem.h index 0c152719669a..fb356be8b426 100644 --- a/drivers/cxl/cxlmem.h +++ b/drivers/cxl/cxlmem.h @@ -532,6 +532,7 @@ enum cxl_opcode { CXL_MBOX_OP_GET_SUP_LOG_SUBLIST = 0x0405, CXL_MBOX_OP_GET_SUPPORTED_FEATURES = 0x0500, CXL_MBOX_OP_GET_FEATURE = 0x0501, + CXL_MBOX_OP_SET_FEATURE = 0x0502, CXL_MBOX_OP_IDENTIFY = 0x4000, CXL_MBOX_OP_GET_PARTITION_INFO = 0x4100, CXL_MBOX_OP_SET_PARTITION_INFO = 0x4101, @@ -879,6 +880,35 @@ struct cxl_mbox_get_feat_in { u8 selection; } __packed; +/* + * Set Feature CXL 3.1 Spec 8.2.9.6.3 + */ + +/* + * Set Feature input payload + * CXL rev 3.1 section 8.2.9.6.3 Table 8-101 + */ +/* Set Feature : Payload in flags */ +#define CXL_SET_FEAT_FLAG_DATA_TRANSFER_MASK GENMASK(2, 0) +enum cxl_set_feat_flag_data_transfer { + CXL_SET_FEAT_FLAG_FULL_DATA_TRANSFER, + CXL_SET_FEAT_FLAG_INITIATE_DATA_TRANSFER, + CXL_SET_FEAT_FLAG_CONTINUE_DATA_TRANSFER, + CXL_SET_FEAT_FLAG_FINISH_DATA_TRANSFER, + CXL_SET_FEAT_FLAG_ABORT_DATA_TRANSFER, + CXL_SET_FEAT_FLAG_DATA_TRANSFER_MAX +}; + +#define CXL_SET_FEAT_FLAG_DATA_SAVED_ACROSS_RESET BIT(3) + +struct cxl_mbox_set_feat_hdr { + uuid_t uuid; + __le32 flags; + __le16 offset; + u8 version; + u8 rsvd[9]; +} __packed; + int cxl_internal_send_cmd(struct cxl_mailbox *cxl_mbox, struct cxl_mbox_cmd *cmd); int cxl_dev_state_identify(struct cxl_memdev_state *mds); @@ -945,4 +975,8 @@ int cxl_get_supported_feature_entry(struct cxl_memdev_state *mds, const uuid_t * size_t cxl_get_feature(struct cxl_memdev_state *mds, const uuid_t feat_uuid, enum cxl_get_feat_selection selection, void *feat_out, size_t feat_out_size); +int cxl_set_feature(struct cxl_memdev_state *mds, + const uuid_t feat_uuid, u8 feat_version, + void *feat_data, size_t feat_data_size, + u8 feat_flag); #endif /* __CXL_MEM_H__ */ From patchwork Fri Nov 1 09:17:25 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Shiju Jose X-Patchwork-Id: 13858980 Received: from frasgout.his.huawei.com (frasgout.his.huawei.com [185.176.79.56]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id B312E196C7B; Fri, 1 Nov 2024 09:18:11 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=185.176.79.56 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1730452694; cv=none; b=aXLgeT/ZvgVL89thEXEWwO/9u8okYl0X5loLnE2yNJ9BrJQ0w+7BHVRXSCuqtX3f4HdaYz8eQiFN9D6Iyq+bYLJFdpOgKapzJfOevjTRMmSw649C8A4JhCWl7om3rqBbkQZg6j+Jw0BGdw+Sj0AihSLOaTJHZRBBt5aME3zuswo= ARC-Message-Signature: i=1; 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Fri, 1 Nov 2024 17:18:09 +0800 (CST) Received: from P_UKIT01-A7bmah.china.huawei.com (10.126.171.129) by frapeml500007.china.huawei.com (7.182.85.172) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.1.2507.39; Fri, 1 Nov 2024 10:18:07 +0100 From: To: , , , , CC: , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , Subject: [PATCH v15 07/15] cxl/memfeature: Add CXL memory device patrol scrub control feature Date: Fri, 1 Nov 2024 09:17:25 +0000 Message-ID: <20241101091735.1465-8-shiju.jose@huawei.com> X-Mailer: git-send-email 2.43.0.windows.1 In-Reply-To: <20241101091735.1465-1-shiju.jose@huawei.com> References: <20241101091735.1465-1-shiju.jose@huawei.com> Precedence: bulk X-Mailing-List: linux-acpi@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-ClientProxiedBy: lhrpeml500004.china.huawei.com (7.191.163.9) To frapeml500007.china.huawei.com (7.182.85.172) From: Shiju Jose CXL spec 3.1 section 8.2.9.9.11.1 describes the device patrol scrub control feature. The device patrol scrub proactively locates and makes corrections to errors in regular cycle. Allow specifying the number of hours within which the patrol scrub must be completed, subject to minimum and maximum limits reported by the device. Also allow disabling scrub allowing trade-off error rates against performance. Add support for patrol scrub control on CXL memory devices. Register with the EDAC device driver, which retrieves the scrub attribute descriptors from EDAC scrub and exposes the sysfs scrub control attributes to userspace. For example, scrub control for the CXL memory device "cxl_mem0" is exposed in /sys/bus/edac/devices/cxl_mem0/scrubX/. Additionally, add support for region-based CXL memory patrol scrub control. CXL memory regions may be interleaved across one or more CXL memory devices. For example, region-based scrub control for "cxl_region1" is exposed in /sys/bus/edac/devices/cxl_region1/scrubX/. Co-developed-by: Jonathan Cameron Signed-off-by: Jonathan Cameron Signed-off-by: Shiju Jose Reviewed-by: Dave Jiang --- drivers/cxl/Kconfig | 18 ++ drivers/cxl/core/Makefile | 1 + drivers/cxl/core/memfeature.c | 384 ++++++++++++++++++++++++++++++++++ drivers/cxl/core/region.c | 6 + drivers/cxl/cxlmem.h | 7 + drivers/cxl/mem.c | 4 + 6 files changed, 420 insertions(+) create mode 100644 drivers/cxl/core/memfeature.c diff --git a/drivers/cxl/Kconfig b/drivers/cxl/Kconfig index 29c192f20082..6d79fb3e772e 100644 --- a/drivers/cxl/Kconfig +++ b/drivers/cxl/Kconfig @@ -145,4 +145,22 @@ config CXL_REGION_INVALIDATION_TEST If unsure, or if this kernel is meant for production environments, say N. +config CXL_RAS_FEAT + tristate "CXL: Memory RAS features" + depends on CXL_PCI + depends on CXL_MEM + depends on EDAC + help + The CXL memory RAS feature control is optional and allows host to + control the RAS features configurations of CXL Type 3 devices. + + It registers with the EDAC device subsystem to expose control + attributes of CXL memory device's RAS features to the user. + It provides interface functions to support configuring the CXL + memory device's RAS features. + + Say 'y/m/n' to enable/disable control of the CXL.mem device's RAS features. + See section 8.2.9.9.11 of CXL 3.1 specification for the detailed + information of CXL memory device features. + endif diff --git a/drivers/cxl/core/Makefile b/drivers/cxl/core/Makefile index 9259bcc6773c..2a3c7197bc23 100644 --- a/drivers/cxl/core/Makefile +++ b/drivers/cxl/core/Makefile @@ -16,3 +16,4 @@ cxl_core-y += pmu.o cxl_core-y += cdat.o cxl_core-$(CONFIG_TRACING) += trace.o cxl_core-$(CONFIG_CXL_REGION) += region.o +cxl_core-$(CONFIG_CXL_RAS_FEAT) += memfeature.o diff --git a/drivers/cxl/core/memfeature.c b/drivers/cxl/core/memfeature.c new file mode 100644 index 000000000000..41298acc01de --- /dev/null +++ b/drivers/cxl/core/memfeature.c @@ -0,0 +1,384 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * CXL memory RAS feature driver. + * + * Copyright (c) 2024 HiSilicon Limited. + * + * - Supports functions to configure RAS features of the + * CXL memory devices. + * - Registers with the EDAC device subsystem driver to expose + * the features sysfs attributes to the user for configuring + * CXL memory RAS feature. + */ + +#include +#include +#include +#include +#include + +#define CXL_DEV_NUM_RAS_FEATURES 1 +#define CXL_DEV_HOUR_IN_SECS 3600 + +#define CXL_SCRUB_NAME_LEN 128 + +/* CXL memory patrol scrub control definitions */ +static const uuid_t cxl_patrol_scrub_uuid = + UUID_INIT(0x96dad7d6, 0xfde8, 0x482b, 0xa7, 0x33, 0x75, 0x77, 0x4e, 0x06, 0xdb, 0x8a); + +/* CXL memory patrol scrub control functions */ +struct cxl_patrol_scrub_context { + u8 instance; + u16 get_feat_size; + u16 set_feat_size; + u8 get_version; + u8 set_version; + u16 set_effects; + struct cxl_memdev *cxlmd; + struct cxl_region *cxlr; +}; + +/** + * struct cxl_memdev_ps_params - CXL memory patrol scrub parameter data structure. + * @enable: [IN & OUT] enable(1)/disable(0) patrol scrub. + * @scrub_cycle_changeable: [OUT] scrub cycle attribute of patrol scrub is changeable. + * @scrub_cycle_hrs: [IN] Requested patrol scrub cycle in hours. + * [OUT] Current patrol scrub cycle in hours. + * @min_scrub_cycle_hrs:[OUT] minimum patrol scrub cycle in hours supported. + */ +struct cxl_memdev_ps_params { + bool enable; + bool scrub_cycle_changeable; + u16 scrub_cycle_hrs; + u16 min_scrub_cycle_hrs; +}; + +enum cxl_scrub_param { + CXL_PS_PARAM_ENABLE, + CXL_PS_PARAM_SCRUB_CYCLE, +}; + +#define CXL_MEMDEV_PS_SCRUB_CYCLE_CHANGE_CAP_MASK BIT(0) +#define CXL_MEMDEV_PS_SCRUB_CYCLE_REALTIME_REPORT_CAP_MASK BIT(1) +#define CXL_MEMDEV_PS_CUR_SCRUB_CYCLE_MASK GENMASK(7, 0) +#define CXL_MEMDEV_PS_MIN_SCRUB_CYCLE_MASK GENMASK(15, 8) +#define CXL_MEMDEV_PS_FLAG_ENABLED_MASK BIT(0) + +struct cxl_memdev_ps_rd_attrs { + u8 scrub_cycle_cap; + __le16 scrub_cycle_hrs; + u8 scrub_flags; +} __packed; + +struct cxl_memdev_ps_wr_attrs { + u8 scrub_cycle_hrs; + u8 scrub_flags; +} __packed; + +static int cxl_mem_ps_get_attrs(struct cxl_memdev_state *mds, + struct cxl_memdev_ps_params *params) +{ + size_t rd_data_size = sizeof(struct cxl_memdev_ps_rd_attrs); + size_t data_size; + struct cxl_memdev_ps_rd_attrs *rd_attrs __free(kfree) = + kmalloc(rd_data_size, GFP_KERNEL); + if (!rd_attrs) + return -ENOMEM; + + data_size = cxl_get_feature(mds, cxl_patrol_scrub_uuid, + CXL_GET_FEAT_SEL_CURRENT_VALUE, + rd_attrs, rd_data_size); + if (!data_size) + return -EIO; + + params->scrub_cycle_changeable = FIELD_GET(CXL_MEMDEV_PS_SCRUB_CYCLE_CHANGE_CAP_MASK, + rd_attrs->scrub_cycle_cap); + params->enable = FIELD_GET(CXL_MEMDEV_PS_FLAG_ENABLED_MASK, + rd_attrs->scrub_flags); + params->scrub_cycle_hrs = FIELD_GET(CXL_MEMDEV_PS_CUR_SCRUB_CYCLE_MASK, + rd_attrs->scrub_cycle_hrs); + params->min_scrub_cycle_hrs = FIELD_GET(CXL_MEMDEV_PS_MIN_SCRUB_CYCLE_MASK, + rd_attrs->scrub_cycle_hrs); + + return 0; +} + +static int cxl_ps_get_attrs(struct device *dev, + struct cxl_patrol_scrub_context *cxl_ps_ctx, + struct cxl_memdev_ps_params *params) +{ + struct cxl_memdev *cxlmd; + struct cxl_dev_state *cxlds; + struct cxl_memdev_state *mds; + u16 min_scrub_cycle = 0; + int i, ret; + + if (cxl_ps_ctx->cxlr) { + struct cxl_region *cxlr = cxl_ps_ctx->cxlr; + struct cxl_region_params *p = &cxlr->params; + + for (i = p->interleave_ways - 1; i >= 0; i--) { + struct cxl_endpoint_decoder *cxled = p->targets[i]; + + cxlmd = cxled_to_memdev(cxled); + cxlds = cxlmd->cxlds; + mds = to_cxl_memdev_state(cxlds); + ret = cxl_mem_ps_get_attrs(mds, params); + if (ret) + return ret; + + if (params->min_scrub_cycle_hrs > min_scrub_cycle) + min_scrub_cycle = params->min_scrub_cycle_hrs; + } + params->min_scrub_cycle_hrs = min_scrub_cycle; + return 0; + } + cxlmd = cxl_ps_ctx->cxlmd; + cxlds = cxlmd->cxlds; + mds = to_cxl_memdev_state(cxlds); + + return cxl_mem_ps_get_attrs(mds, params); +} + +static int cxl_mem_ps_set_attrs(struct device *dev, + struct cxl_patrol_scrub_context *cxl_ps_ctx, + struct cxl_memdev_state *mds, + struct cxl_memdev_ps_params *params, + enum cxl_scrub_param param_type) +{ + struct cxl_memdev_ps_wr_attrs wr_attrs; + struct cxl_memdev_ps_params rd_params; + int ret; + + ret = cxl_mem_ps_get_attrs(mds, &rd_params); + if (ret) { + dev_err(dev, "Get cxlmemdev patrol scrub params failed ret=%d\n", + ret); + return ret; + } + + switch (param_type) { + case CXL_PS_PARAM_ENABLE: + wr_attrs.scrub_flags = FIELD_PREP(CXL_MEMDEV_PS_FLAG_ENABLED_MASK, + params->enable); + wr_attrs.scrub_cycle_hrs = FIELD_PREP(CXL_MEMDEV_PS_CUR_SCRUB_CYCLE_MASK, + rd_params.scrub_cycle_hrs); + break; + case CXL_PS_PARAM_SCRUB_CYCLE: + if (params->scrub_cycle_hrs < rd_params.min_scrub_cycle_hrs) { + dev_err(dev, "Invalid CXL patrol scrub cycle(%d) to set\n", + params->scrub_cycle_hrs); + dev_err(dev, "Minimum supported CXL patrol scrub cycle in hour %d\n", + rd_params.min_scrub_cycle_hrs); + return -EINVAL; + } + wr_attrs.scrub_cycle_hrs = FIELD_PREP(CXL_MEMDEV_PS_CUR_SCRUB_CYCLE_MASK, + params->scrub_cycle_hrs); + wr_attrs.scrub_flags = FIELD_PREP(CXL_MEMDEV_PS_FLAG_ENABLED_MASK, + rd_params.enable); + break; + } + + ret = cxl_set_feature(mds, cxl_patrol_scrub_uuid, + cxl_ps_ctx->set_version, + &wr_attrs, sizeof(wr_attrs), + CXL_SET_FEAT_FLAG_DATA_SAVED_ACROSS_RESET); + if (ret) { + dev_err(dev, "CXL patrol scrub set feature failed ret=%d\n", ret); + return ret; + } + + return 0; +} + +static int cxl_ps_set_attrs(struct device *dev, + struct cxl_patrol_scrub_context *cxl_ps_ctx, + struct cxl_memdev_ps_params *params, + enum cxl_scrub_param param_type) +{ + struct cxl_memdev *cxlmd; + struct cxl_dev_state *cxlds; + struct cxl_memdev_state *mds; + int ret, i; + + if (cxl_ps_ctx->cxlr) { + struct cxl_region *cxlr = cxl_ps_ctx->cxlr; + struct cxl_region_params *p = &cxlr->params; + + for (i = p->interleave_ways - 1; i >= 0; i--) { + struct cxl_endpoint_decoder *cxled = p->targets[i]; + + cxlmd = cxled_to_memdev(cxled); + cxlds = cxlmd->cxlds; + mds = to_cxl_memdev_state(cxlds); + ret = cxl_mem_ps_set_attrs(dev, cxl_ps_ctx, mds, + params, param_type); + if (ret) + return ret; + } + return 0; + } + cxlmd = cxl_ps_ctx->cxlmd; + cxlds = cxlmd->cxlds; + mds = to_cxl_memdev_state(cxlds); + + return cxl_mem_ps_set_attrs(dev, cxl_ps_ctx, mds, params, param_type); +} + +static int cxl_patrol_scrub_get_enabled_bg(struct device *dev, void *drv_data, bool *enabled) +{ + struct cxl_patrol_scrub_context *ctx = drv_data; + struct cxl_memdev_ps_params params; + int ret; + + ret = cxl_ps_get_attrs(dev, ctx, ¶ms); + if (ret) + return ret; + + *enabled = params.enable; + + return 0; +} + +static int cxl_patrol_scrub_set_enabled_bg(struct device *dev, void *drv_data, bool enable) +{ + struct cxl_patrol_scrub_context *ctx = drv_data; + struct cxl_memdev_ps_params params = { + .enable = enable, + }; + + return cxl_ps_set_attrs(dev, ctx, ¶ms, CXL_PS_PARAM_ENABLE); +} + +static int cxl_patrol_scrub_read_min_scrub_cycle(struct device *dev, void *drv_data, + u32 *min) +{ + struct cxl_patrol_scrub_context *ctx = drv_data; + struct cxl_memdev_ps_params params; + int ret; + + ret = cxl_ps_get_attrs(dev, ctx, ¶ms); + if (ret) + return ret; + *min = params.min_scrub_cycle_hrs * CXL_DEV_HOUR_IN_SECS; + + return 0; +} + +static int cxl_patrol_scrub_read_max_scrub_cycle(struct device *dev, void *drv_data, + u32 *max) +{ + *max = U8_MAX * CXL_DEV_HOUR_IN_SECS; /* Max set by register size */ + + return 0; +} + +static int cxl_patrol_scrub_read_scrub_cycle(struct device *dev, void *drv_data, + u32 *scrub_cycle_secs) +{ + struct cxl_patrol_scrub_context *ctx = drv_data; + struct cxl_memdev_ps_params params; + int ret; + + ret = cxl_ps_get_attrs(dev, ctx, ¶ms); + if (ret) + return ret; + + *scrub_cycle_secs = params.scrub_cycle_hrs * CXL_DEV_HOUR_IN_SECS; + + return 0; +} + +static int cxl_patrol_scrub_write_scrub_cycle(struct device *dev, void *drv_data, + u32 scrub_cycle_secs) +{ + struct cxl_patrol_scrub_context *ctx = drv_data; + struct cxl_memdev_ps_params params = { + .scrub_cycle_hrs = scrub_cycle_secs / CXL_DEV_HOUR_IN_SECS, + }; + + return cxl_ps_set_attrs(dev, ctx, ¶ms, CXL_PS_PARAM_SCRUB_CYCLE); +} + +static const struct edac_scrub_ops cxl_ps_scrub_ops = { + .get_enabled_bg = cxl_patrol_scrub_get_enabled_bg, + .set_enabled_bg = cxl_patrol_scrub_set_enabled_bg, + .get_min_cycle = cxl_patrol_scrub_read_min_scrub_cycle, + .get_max_cycle = cxl_patrol_scrub_read_max_scrub_cycle, + .get_cycle_duration = cxl_patrol_scrub_read_scrub_cycle, + .set_cycle_duration = cxl_patrol_scrub_write_scrub_cycle, +}; + +int cxl_mem_ras_features_init(struct cxl_memdev *cxlmd, struct cxl_region *cxlr) +{ + struct edac_dev_feature ras_features[CXL_DEV_NUM_RAS_FEATURES]; + struct cxl_patrol_scrub_context *cxl_ps_ctx; + char cxl_dev_name[CXL_SCRUB_NAME_LEN]; + struct cxl_feat_entry feat_entry; + struct cxl_memdev_state *mds; + struct cxl_dev_state *cxlds; + int num_ras_features = 0; + u8 scrub_inst = 0; + int rc, i; + + if (cxlr) { + struct cxl_region_params *p = &cxlr->params; + + for (i = p->interleave_ways - 1; i >= 0; i--) { + struct cxl_endpoint_decoder *cxled = p->targets[i]; + + cxlmd = cxled_to_memdev(cxled); + cxlds = cxlmd->cxlds; + mds = to_cxl_memdev_state(cxlds); + memset(&feat_entry, 0, sizeof(feat_entry)); + rc = cxl_get_supported_feature_entry(mds, &cxl_patrol_scrub_uuid, + &feat_entry); + if (rc < 0) + return rc; + if (!(feat_entry.attr_flags & CXL_FEAT_ENTRY_FLAG_CHANGABLE)) + return -EOPNOTSUPP; + } + } else { + cxlds = cxlmd->cxlds; + mds = to_cxl_memdev_state(cxlds); + rc = cxl_get_supported_feature_entry(mds, &cxl_patrol_scrub_uuid, + &feat_entry); + if (rc < 0) + return rc; + + if (!(feat_entry.attr_flags & CXL_FEAT_ENTRY_FLAG_CHANGABLE)) + return -EOPNOTSUPP; + } + + cxl_ps_ctx = devm_kzalloc(&cxlmd->dev, sizeof(*cxl_ps_ctx), GFP_KERNEL); + if (!cxl_ps_ctx) + return -ENOMEM; + + *cxl_ps_ctx = (struct cxl_patrol_scrub_context) { + .get_feat_size = feat_entry.get_feat_size, + .set_feat_size = feat_entry.set_feat_size, + .get_version = feat_entry.get_feat_ver, + .set_version = feat_entry.set_feat_ver, + .set_effects = feat_entry.set_effects, + .instance = scrub_inst++, + }; + if (cxlr) { + snprintf(cxl_dev_name, sizeof(cxl_dev_name), + "cxl_region%d", cxlr->id); + cxl_ps_ctx->cxlr = cxlr; + } else { + snprintf(cxl_dev_name, sizeof(cxl_dev_name), + "%s_%s", "cxl", dev_name(&cxlmd->dev)); + cxl_ps_ctx->cxlmd = cxlmd; + } + + ras_features[num_ras_features].ft_type = RAS_FEAT_SCRUB; + ras_features[num_ras_features].instance = cxl_ps_ctx->instance; + ras_features[num_ras_features].scrub_ops = &cxl_ps_scrub_ops; + ras_features[num_ras_features].ctx = cxl_ps_ctx; + num_ras_features++; + + return edac_dev_register(&cxlmd->dev, cxl_dev_name, NULL, + num_ras_features, ras_features); +} +EXPORT_SYMBOL_NS_GPL(cxl_mem_ras_features_init, CXL); diff --git a/drivers/cxl/core/region.c b/drivers/cxl/core/region.c index e701e4b04032..4292765606cd 100644 --- a/drivers/cxl/core/region.c +++ b/drivers/cxl/core/region.c @@ -3443,6 +3443,12 @@ static int cxl_region_probe(struct device *dev) p->res->start, p->res->end, cxlr, is_system_ram) > 0) return 0; + + rc = cxl_mem_ras_features_init(NULL, cxlr); + if (rc) + dev_warn(&cxlr->dev, "CXL RAS features init for region_id=%d failed\n", + cxlr->id); + return devm_cxl_add_dax_region(cxlr); default: dev_dbg(&cxlr->dev, "unsupported region mode: %d\n", diff --git a/drivers/cxl/cxlmem.h b/drivers/cxl/cxlmem.h index fb356be8b426..9259c5d70a65 100644 --- a/drivers/cxl/cxlmem.h +++ b/drivers/cxl/cxlmem.h @@ -933,6 +933,13 @@ int cxl_trigger_poison_list(struct cxl_memdev *cxlmd); int cxl_inject_poison(struct cxl_memdev *cxlmd, u64 dpa); int cxl_clear_poison(struct cxl_memdev *cxlmd, u64 dpa); +#if IS_ENABLED(CONFIG_CXL_RAS_FEAT) +int cxl_mem_ras_features_init(struct cxl_memdev *cxlmd, struct cxl_region *cxlr); +#else +static inline int cxl_mem_ras_features_init(struct cxl_memdev *cxlmd, struct cxl_region *cxlr) +{ return 0; } +#endif + #ifdef CONFIG_CXL_SUSPEND void cxl_mem_active_inc(void); void cxl_mem_active_dec(void); diff --git a/drivers/cxl/mem.c b/drivers/cxl/mem.c index a9fd5cd5a0d2..23ef99e02182 100644 --- a/drivers/cxl/mem.c +++ b/drivers/cxl/mem.c @@ -116,6 +116,10 @@ static int cxl_mem_probe(struct device *dev) if (!cxlds->media_ready) return -EBUSY; + rc = cxl_mem_ras_features_init(cxlmd, NULL); + if (rc) + dev_warn(&cxlmd->dev, "CXL RAS features init failed\n"); + /* * Someone is trying to reattach this device after it lost its port * connection (an endpoint port previously registered by this memdev was From patchwork Fri Nov 1 09:17:26 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Shiju Jose X-Patchwork-Id: 13858981 Received: from frasgout.his.huawei.com (frasgout.his.huawei.com [185.176.79.56]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 335F719ABDC; 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dmarc=pass (p=quarantine dis=none) header.from=huawei.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=huawei.com Received: from mail.maildlp.com (unknown [172.18.186.31]) by frasgout.his.huawei.com (SkyGuard) with ESMTP id 4XfwFV1dn2z6K6Kb; Fri, 1 Nov 2024 17:15:42 +0800 (CST) Received: from frapeml500007.china.huawei.com (unknown [7.182.85.172]) by mail.maildlp.com (Postfix) with ESMTPS id 2FCC6140445; Fri, 1 Nov 2024 17:18:13 +0800 (CST) Received: from P_UKIT01-A7bmah.china.huawei.com (10.126.171.129) by frapeml500007.china.huawei.com (7.182.85.172) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.1.2507.39; Fri, 1 Nov 2024 10:18:10 +0100 From: To: , , , , CC: , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , Subject: [PATCH v15 08/15] cxl/memfeature: Add CXL memory device ECS control feature Date: Fri, 1 Nov 2024 09:17:26 +0000 Message-ID: <20241101091735.1465-9-shiju.jose@huawei.com> X-Mailer: git-send-email 2.43.0.windows.1 In-Reply-To: <20241101091735.1465-1-shiju.jose@huawei.com> References: <20241101091735.1465-1-shiju.jose@huawei.com> Precedence: bulk X-Mailing-List: linux-acpi@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-ClientProxiedBy: lhrpeml500004.china.huawei.com (7.191.163.9) To frapeml500007.china.huawei.com (7.182.85.172) From: Shiju Jose CXL spec 3.1 section 8.2.9.9.11.2 describes the DDR5 ECS (Error Check Scrub) control feature. The Error Check Scrub (ECS) is a feature defined in JEDEC DDR5 SDRAM Specification (JESD79-5) and allows the DRAM to internally read, correct single-bit errors, and write back corrected data bits to the DRAM array while providing transparency to error counts. The ECS control allows the requester to change the log entry type, the ECS threshold count (provided the request falls within the limits specified in DDR5 mode registers), switch between codeword mode and row count mode, and reset the ECS counter. Register with EDAC device driver, which retrieves the ECS attribute descriptors from the EDAC ECS and exposes the ECS control attributes to userspace via sysfs. For example, the ECS control for the memory media FRU0 in CXL mem0 device is located at /sys/bus/edac/devices/cxl_mem0/ecs_fru0/ Signed-off-by: Shiju Jose --- drivers/cxl/core/memfeature.c | 342 +++++++++++++++++++++++++++++++++- 1 file changed, 339 insertions(+), 3 deletions(-) diff --git a/drivers/cxl/core/memfeature.c b/drivers/cxl/core/memfeature.c index 41298acc01de..e641396a32f5 100644 --- a/drivers/cxl/core/memfeature.c +++ b/drivers/cxl/core/memfeature.c @@ -17,7 +17,7 @@ #include #include -#define CXL_DEV_NUM_RAS_FEATURES 1 +#define CXL_DEV_NUM_RAS_FEATURES 2 #define CXL_DEV_HOUR_IN_SECS 3600 #define CXL_SCRUB_NAME_LEN 128 @@ -309,15 +309,314 @@ static const struct edac_scrub_ops cxl_ps_scrub_ops = { .set_cycle_duration = cxl_patrol_scrub_write_scrub_cycle, }; +/* CXL DDR5 ECS control definitions */ +static const uuid_t cxl_ecs_uuid = + UUID_INIT(0xe5b13f22, 0x2328, 0x4a14, 0xb8, 0xba, 0xb9, 0x69, 0x1e, 0x89, 0x33, 0x86); + +struct cxl_ecs_context { + u16 num_media_frus; + u16 get_feat_size; + u16 set_feat_size; + u8 get_version; + u8 set_version; + u16 set_effects; + struct cxl_memdev *cxlmd; +}; + +enum { + CXL_ECS_PARAM_LOG_ENTRY_TYPE, + CXL_ECS_PARAM_THRESHOLD, + CXL_ECS_PARAM_MODE, + CXL_ECS_PARAM_RESET_COUNTER, +}; + +#define CXL_ECS_LOG_ENTRY_TYPE_MASK GENMASK(1, 0) +#define CXL_ECS_REALTIME_REPORT_CAP_MASK BIT(0) +#define CXL_ECS_THRESHOLD_COUNT_MASK GENMASK(2, 0) +#define CXL_ECS_COUNT_MODE_MASK BIT(3) +#define CXL_ECS_RESET_COUNTER_MASK BIT(4) + +enum { + ECS_THRESHOLD_256 = 3, + ECS_THRESHOLD_1024 = 4, + ECS_THRESHOLD_4096 = 5, +}; + +static const u16 ecs_supp_threshold[] = { + [ECS_THRESHOLD_256] = 256, + [ECS_THRESHOLD_1024] = 1024, + [ECS_THRESHOLD_4096] = 4096, +}; + +enum { + ECS_LOG_ENTRY_TYPE_DRAM = 0x0, + ECS_LOG_ENTRY_TYPE_MEM_MEDIA_FRU = 0x1, +}; + +enum cxl_ecs_count_mode { + ECS_MODE_COUNTS_ROWS = 0, + ECS_MODE_COUNTS_CODEWORDS = 1, +}; + +/** + * struct cxl_ecs_params - CXL memory DDR5 ECS parameter data structure. + * @log_entry_type: ECS log entry type, per DRAM or per memory media FRU. + * @threshold: ECS threshold count per GB of memory cells. + * @count_mode: codeword/row count mode + * 0 : ECS counts rows with errors + * 1 : ECS counts codeword with errors + * @reset_counter: [IN] reset ECC counter to default value. + */ +struct cxl_ecs_params { + u8 log_entry_type; + u16 threshold; + enum cxl_ecs_count_mode count_mode; + u8 reset_counter; +}; + +struct cxl_ecs_fru_rd_attrs { + u8 ecs_cap; + __le16 ecs_config; + u8 ecs_flags; +} __packed; + +struct cxl_ecs_rd_attrs { + u8 ecs_log_cap; + struct cxl_ecs_fru_rd_attrs fru_attrs[]; +} __packed; + +struct cxl_ecs_fru_wr_attrs { + __le16 ecs_config; +} __packed; + +struct cxl_ecs_wr_attrs { + u8 ecs_log_cap; + struct cxl_ecs_fru_wr_attrs fru_attrs[]; +} __packed; + +/* CXL DDR5 ECS control functions */ +static int cxl_mem_ecs_get_attrs(struct device *dev, + struct cxl_ecs_context *cxl_ecs_ctx, + int fru_id, struct cxl_ecs_params *params) +{ + struct cxl_memdev *cxlmd = cxl_ecs_ctx->cxlmd; + struct cxl_dev_state *cxlds = cxlmd->cxlds; + struct cxl_memdev_state *mds = to_cxl_memdev_state(cxlds); + struct cxl_ecs_fru_rd_attrs *fru_rd_attrs; + size_t rd_data_size; + u8 threshold_index; + size_t data_size; + + rd_data_size = cxl_ecs_ctx->get_feat_size; + + struct cxl_ecs_rd_attrs *rd_attrs __free(kfree) = + kmalloc(rd_data_size, GFP_KERNEL); + if (!rd_attrs) + return -ENOMEM; + + params->log_entry_type = 0; + params->threshold = 0; + params->count_mode = 0; + data_size = cxl_get_feature(mds, cxl_ecs_uuid, + CXL_GET_FEAT_SEL_CURRENT_VALUE, + rd_attrs, rd_data_size); + if (!data_size) + return -EIO; + + fru_rd_attrs = rd_attrs->fru_attrs; + params->log_entry_type = FIELD_GET(CXL_ECS_LOG_ENTRY_TYPE_MASK, + rd_attrs->ecs_log_cap); + threshold_index = FIELD_GET(CXL_ECS_THRESHOLD_COUNT_MASK, + fru_rd_attrs[fru_id].ecs_config); + params->threshold = ecs_supp_threshold[threshold_index]; + params->count_mode = FIELD_GET(CXL_ECS_COUNT_MODE_MASK, + fru_rd_attrs[fru_id].ecs_config); + return 0; +} + +static int cxl_mem_ecs_set_attrs(struct device *dev, + struct cxl_ecs_context *cxl_ecs_ctx, + int fru_id, struct cxl_ecs_params *params, + u8 param_type) +{ + struct cxl_memdev *cxlmd = cxl_ecs_ctx->cxlmd; + struct cxl_dev_state *cxlds = cxlmd->cxlds; + struct cxl_memdev_state *mds = to_cxl_memdev_state(cxlds); + struct cxl_ecs_fru_rd_attrs *fru_rd_attrs; + struct cxl_ecs_fru_wr_attrs *fru_wr_attrs; + size_t rd_data_size, wr_data_size; + u16 num_media_frus, count; + size_t data_size; + int ret; + + num_media_frus = cxl_ecs_ctx->num_media_frus; + rd_data_size = cxl_ecs_ctx->get_feat_size; + wr_data_size = cxl_ecs_ctx->set_feat_size; + struct cxl_ecs_rd_attrs *rd_attrs __free(kfree) = + kmalloc(rd_data_size, GFP_KERNEL); + if (!rd_attrs) + return -ENOMEM; + + data_size = cxl_get_feature(mds, cxl_ecs_uuid, + CXL_GET_FEAT_SEL_CURRENT_VALUE, + rd_attrs, rd_data_size); + if (!data_size) + return -EIO; + + struct cxl_ecs_wr_attrs *wr_attrs __free(kfree) = + kmalloc(wr_data_size, GFP_KERNEL); + if (!wr_attrs) + return -ENOMEM; + + /* + * Fill writable attributes from the current attributes read + * for all the media FRUs. + */ + fru_rd_attrs = rd_attrs->fru_attrs; + fru_wr_attrs = wr_attrs->fru_attrs; + wr_attrs->ecs_log_cap = rd_attrs->ecs_log_cap; + for (count = 0; count < num_media_frus; count++) + fru_wr_attrs[count].ecs_config = fru_rd_attrs[count].ecs_config; + + /* Fill attribute to be set for the media FRU */ + switch (param_type) { + case CXL_ECS_PARAM_LOG_ENTRY_TYPE: + if (params->log_entry_type != ECS_LOG_ENTRY_TYPE_DRAM && + params->log_entry_type != ECS_LOG_ENTRY_TYPE_MEM_MEDIA_FRU) { + dev_err(dev, + "Invalid CXL ECS scrub log entry type(%d) to set\n", + params->log_entry_type); + dev_err(dev, + "Log Entry Type 0: per DRAM 1: per Memory Media FRU\n"); + return -EINVAL; + } + wr_attrs->ecs_log_cap = FIELD_PREP(CXL_ECS_LOG_ENTRY_TYPE_MASK, + params->log_entry_type); + break; + case CXL_ECS_PARAM_THRESHOLD: + fru_wr_attrs[fru_id].ecs_config &= ~CXL_ECS_THRESHOLD_COUNT_MASK; + switch (params->threshold) { + case 256: + fru_wr_attrs[fru_id].ecs_config |= FIELD_PREP(CXL_ECS_THRESHOLD_COUNT_MASK, + ECS_THRESHOLD_256); + break; + case 1024: + fru_wr_attrs[fru_id].ecs_config |= FIELD_PREP(CXL_ECS_THRESHOLD_COUNT_MASK, + ECS_THRESHOLD_1024); + break; + case 4096: + fru_wr_attrs[fru_id].ecs_config |= FIELD_PREP(CXL_ECS_THRESHOLD_COUNT_MASK, + ECS_THRESHOLD_4096); + break; + default: + dev_err(dev, + "Invalid CXL ECS scrub threshold count(%d) to set\n", + params->threshold); + dev_err(dev, + "Supported scrub threshold counts: %u, %u, %u\n", + ecs_supp_threshold[ECS_THRESHOLD_256], + ecs_supp_threshold[ECS_THRESHOLD_1024], + ecs_supp_threshold[ECS_THRESHOLD_4096]); + return -EINVAL; + } + break; + case CXL_ECS_PARAM_MODE: + if (params->count_mode != ECS_MODE_COUNTS_ROWS && + params->count_mode != ECS_MODE_COUNTS_CODEWORDS) { + dev_err(dev, + "Invalid CXL ECS scrub mode(%d) to set\n", + params->count_mode); + dev_err(dev, + "Supported ECS Modes: 0: ECS counts rows with errors," + " 1: ECS counts codewords with errors\n"); + return -EINVAL; + } + fru_wr_attrs[fru_id].ecs_config &= ~CXL_ECS_COUNT_MODE_MASK; + fru_wr_attrs[fru_id].ecs_config |= FIELD_PREP(CXL_ECS_COUNT_MODE_MASK, + params->count_mode); + break; + case CXL_ECS_PARAM_RESET_COUNTER: + if (params->reset_counter != 1) + return -EINVAL; + + fru_wr_attrs[fru_id].ecs_config &= ~CXL_ECS_RESET_COUNTER_MASK; + fru_wr_attrs[fru_id].ecs_config |= FIELD_PREP(CXL_ECS_RESET_COUNTER_MASK, + params->reset_counter); + break; + default: + dev_err(dev, "Invalid CXL ECS parameter to set\n"); + return -EINVAL; + } + + ret = cxl_set_feature(mds, cxl_ecs_uuid, cxl_ecs_ctx->set_version, + wr_attrs, wr_data_size, + CXL_SET_FEAT_FLAG_DATA_SAVED_ACROSS_RESET); + if (ret) { + dev_err(dev, "CXL ECS set feature failed ret=%d\n", ret); + return ret; + } + + return 0; +} + +#define CXL_ECS_GET_ATTR(attrib) \ +static int cxl_ecs_get_##attrib(struct device *dev, void *drv_data, \ + int fru_id, u32 *val) \ +{ \ + struct cxl_ecs_context *ctx = drv_data; \ + struct cxl_ecs_params params; \ + int ret; \ + \ + ret = cxl_mem_ecs_get_attrs(dev, ctx, fru_id, ¶ms); \ + if (ret) \ + return ret; \ + \ + *val = params.attrib; \ + \ + return 0; \ +} + +CXL_ECS_GET_ATTR(log_entry_type) +CXL_ECS_GET_ATTR(count_mode) +CXL_ECS_GET_ATTR(threshold) + +#define CXL_ECS_SET_ATTR(attrib, param_type) \ +static int cxl_ecs_set_##attrib(struct device *dev, void *drv_data, \ + int fru_id, u32 val) \ +{ \ + struct cxl_ecs_context *ctx = drv_data; \ + struct cxl_ecs_params params = { \ + .attrib = val, \ + }; \ + \ + return cxl_mem_ecs_set_attrs(dev, ctx, fru_id, ¶ms, (param_type)); \ +} +CXL_ECS_SET_ATTR(log_entry_type, CXL_ECS_PARAM_LOG_ENTRY_TYPE) +CXL_ECS_SET_ATTR(count_mode, CXL_ECS_PARAM_MODE) +CXL_ECS_SET_ATTR(reset_counter, CXL_ECS_PARAM_RESET_COUNTER) +CXL_ECS_SET_ATTR(threshold, CXL_ECS_PARAM_THRESHOLD) + +static const struct edac_ecs_ops cxl_ecs_ops = { + .get_log_entry_type = cxl_ecs_get_log_entry_type, + .set_log_entry_type = cxl_ecs_set_log_entry_type, + .get_mode = cxl_ecs_get_count_mode, + .set_mode = cxl_ecs_set_count_mode, + .reset = cxl_ecs_set_reset_counter, + .get_threshold = cxl_ecs_get_threshold, + .set_threshold = cxl_ecs_set_threshold, +}; + int cxl_mem_ras_features_init(struct cxl_memdev *cxlmd, struct cxl_region *cxlr) { struct edac_dev_feature ras_features[CXL_DEV_NUM_RAS_FEATURES]; struct cxl_patrol_scrub_context *cxl_ps_ctx; char cxl_dev_name[CXL_SCRUB_NAME_LEN]; + struct cxl_ecs_context *cxl_ecs_ctx; struct cxl_feat_entry feat_entry; struct cxl_memdev_state *mds; struct cxl_dev_state *cxlds; int num_ras_features = 0; + int num_media_frus; u8 scrub_inst = 0; int rc, i; @@ -344,10 +643,10 @@ int cxl_mem_ras_features_init(struct cxl_memdev *cxlmd, struct cxl_region *cxlr) rc = cxl_get_supported_feature_entry(mds, &cxl_patrol_scrub_uuid, &feat_entry); if (rc < 0) - return rc; + goto feat_scrub_done; if (!(feat_entry.attr_flags & CXL_FEAT_ENTRY_FLAG_CHANGABLE)) - return -EOPNOTSUPP; + goto feat_scrub_done; } cxl_ps_ctx = devm_kzalloc(&cxlmd->dev, sizeof(*cxl_ps_ctx), GFP_KERNEL); @@ -378,6 +677,43 @@ int cxl_mem_ras_features_init(struct cxl_memdev *cxlmd, struct cxl_region *cxlr) ras_features[num_ras_features].ctx = cxl_ps_ctx; num_ras_features++; +feat_scrub_done: + if (!cxlr) { + rc = cxl_get_supported_feature_entry(mds, &cxl_ecs_uuid, + &feat_entry); + if (rc < 0) + goto feat_ecs_done; + + if (!(feat_entry.attr_flags & CXL_FEAT_ENTRY_FLAG_CHANGABLE)) + goto feat_ecs_done; + num_media_frus = (feat_entry.get_feat_size - sizeof(struct cxl_ecs_rd_attrs)) / + sizeof(struct cxl_ecs_fru_rd_attrs); + if (!num_media_frus) + goto feat_ecs_done; + + cxl_ecs_ctx = devm_kzalloc(&cxlmd->dev, sizeof(*cxl_ecs_ctx), + GFP_KERNEL); + if (!cxl_ecs_ctx) + goto feat_ecs_done; + *cxl_ecs_ctx = (struct cxl_ecs_context) { + .get_feat_size = feat_entry.get_feat_size, + .set_feat_size = feat_entry.set_feat_size, + .get_version = feat_entry.get_feat_ver, + .set_version = feat_entry.set_feat_ver, + .set_effects = feat_entry.set_effects, + .num_media_frus = num_media_frus, + .cxlmd = cxlmd, + }; + + ras_features[num_ras_features].ft_type = RAS_FEAT_ECS; + ras_features[num_ras_features].ecs_ops = &cxl_ecs_ops; + ras_features[num_ras_features].ctx = cxl_ecs_ctx; + ras_features[num_ras_features].ecs_info.num_media_frus = + num_media_frus; + num_ras_features++; + } + +feat_ecs_done: return edac_dev_register(&cxlmd->dev, cxl_dev_name, NULL, num_ras_features, ras_features); } From patchwork Fri Nov 1 09:17:27 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Shiju Jose X-Patchwork-Id: 13858982 Received: from frasgout.his.huawei.com (frasgout.his.huawei.com [185.176.79.56]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 4304115A85A; 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dmarc=pass (p=quarantine dis=none) header.from=huawei.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=huawei.com Received: from mail.maildlp.com (unknown [172.18.186.216]) by frasgout.his.huawei.com (SkyGuard) with ESMTP id 4XfwBp4mRCz6L6tf; Fri, 1 Nov 2024 17:13:22 +0800 (CST) Received: from frapeml500007.china.huawei.com (unknown [7.182.85.172]) by mail.maildlp.com (Postfix) with ESMTPS id 79D87140A36; Fri, 1 Nov 2024 17:18:16 +0800 (CST) Received: from P_UKIT01-A7bmah.china.huawei.com (10.126.171.129) by frapeml500007.china.huawei.com (7.182.85.172) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.1.2507.39; Fri, 1 Nov 2024 10:18:14 +0100 From: To: , , , , CC: , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , Subject: [PATCH v15 09/15] ACPI:RAS2: Add ACPI RAS2 driver Date: Fri, 1 Nov 2024 09:17:27 +0000 Message-ID: <20241101091735.1465-10-shiju.jose@huawei.com> X-Mailer: git-send-email 2.43.0.windows.1 In-Reply-To: <20241101091735.1465-1-shiju.jose@huawei.com> References: <20241101091735.1465-1-shiju.jose@huawei.com> Precedence: bulk X-Mailing-List: linux-acpi@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-ClientProxiedBy: lhrpeml500004.china.huawei.com (7.191.163.9) To frapeml500007.china.huawei.com (7.182.85.172) From: Shiju Jose Add support for ACPI RAS2 feature table (RAS2) defined in the ACPI 6.5 Specification, section 5.2.21. Driver contains RAS2 Init, which extracts the RAS2 table and driver adds auxiliary device for each memory feature which binds to the RAS2 memory driver. Driver uses PCC mailbox to communicate with the ACPI HW and the driver adds OSPM interfaces to send RAS2 commands. Co-developed-by: A Somasundaram Signed-off-by: A Somasundaram Co-developed-by: Jonathan Cameron Signed-off-by: Jonathan Cameron Signed-off-by: Shiju Jose --- drivers/acpi/Kconfig | 11 ++ drivers/acpi/Makefile | 1 + drivers/acpi/ras2.c | 409 +++++++++++++++++++++++++++++++++++++++ include/acpi/ras2_acpi.h | 45 +++++ 4 files changed, 466 insertions(+) create mode 100755 drivers/acpi/ras2.c create mode 100644 include/acpi/ras2_acpi.h diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig index d67f63d93b2a..ceae55704a14 100644 --- a/drivers/acpi/Kconfig +++ b/drivers/acpi/Kconfig @@ -284,6 +284,17 @@ config ACPI_CPPC_LIB If your platform does not support CPPC in firmware, leave this option disabled. +config ACPI_RAS2 + bool "ACPI RAS2 driver" + select AUXILIARY_BUS + select MAILBOX + select PCC + help + The driver adds support for ACPI RAS2 feature table(extracts RAS2 + table from OS system table) and OSPM interfaces to send RAS2 + commands via PCC mailbox subspace. Driver adds platform device for + the RAS2 memory features which binds to the RAS2 memory driver. + config ACPI_PROCESSOR tristate "Processor" depends on X86 || ARM64 || LOONGARCH || RISCV diff --git a/drivers/acpi/Makefile b/drivers/acpi/Makefile index 61ca4afe83dc..84e2a2519bae 100644 --- a/drivers/acpi/Makefile +++ b/drivers/acpi/Makefile @@ -100,6 +100,7 @@ obj-$(CONFIG_ACPI_EC_DEBUGFS) += ec_sys.o obj-$(CONFIG_ACPI_BGRT) += bgrt.o obj-$(CONFIG_ACPI_CPPC_LIB) += cppc_acpi.o obj-$(CONFIG_ACPI_SPCR_TABLE) += spcr.o +obj-$(CONFIG_ACPI_RAS2) += ras2.o obj-$(CONFIG_ACPI_DEBUGGER_USER) += acpi_dbg.o obj-$(CONFIG_ACPI_PPTT) += pptt.o obj-$(CONFIG_ACPI_PFRUT) += pfr_update.o pfr_telemetry.o diff --git a/drivers/acpi/ras2.c b/drivers/acpi/ras2.c new file mode 100755 index 000000000000..56ad7667ce81 --- /dev/null +++ b/drivers/acpi/ras2.c @@ -0,0 +1,409 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Implementation of ACPI RAS2 driver. + * + * Copyright (c) 2024 HiSilicon Limited. + * + * Support for RAS2 - ACPI 6.5 Specification, section 5.2.21 + * + * Driver contains ACPI RAS2 init, which extracts the ACPI RAS2 table and + * get the PCC channel subspace for communicating with the ACPI compliant + * HW platform which supports ACPI RAS2. Driver adds platform devices + * for each RAS2 memory feature which binds to the memory ACPI RAS2 driver. + */ + +#define pr_fmt(fmt) "ACPI RAS2: " fmt + +#include +#include +#include +#include +#include +#include + +/* Data structure for PCC communication */ +struct ras2_pcc_subspace { + int pcc_subspace_id; + struct mbox_client mbox_client; + struct pcc_mbox_chan *pcc_chan; + struct acpi_ras2_shared_memory __iomem *pcc_comm_addr; + bool pcc_channel_acquired; + ktime_t deadline; + unsigned int pcc_mpar; + unsigned int pcc_mrtt; + struct list_head elem; + u16 ref_count; +}; + +/* + * Arbitrary Retries for PCC commands because the + * remote processor could be much slower to reply. + */ +#define RAS2_NUM_RETRIES 600 + +#define RAS2_FEATURE_TYPE_MEMORY 0x00 + +/* global variables for the RAS2 PCC subspaces */ +static DEFINE_MUTEX(ras2_pcc_subspace_lock); +static LIST_HEAD(ras2_pcc_subspaces); + +static int ras2_report_cap_error(u32 cap_status) +{ + switch (cap_status) { + case ACPI_RAS2_NOT_VALID: + case ACPI_RAS2_NOT_SUPPORTED: + return -EPERM; + case ACPI_RAS2_BUSY: + return -EBUSY; + case ACPI_RAS2_FAILED: + case ACPI_RAS2_ABORTED: + case ACPI_RAS2_INVALID_DATA: + return -EINVAL; + default: /* 0 or other, Success */ + return 0; + } +} + +static int ras2_check_pcc_chan(struct ras2_pcc_subspace *pcc_subspace) +{ + struct acpi_ras2_shared_memory __iomem *generic_comm_base = pcc_subspace->pcc_comm_addr; + ktime_t next_deadline = ktime_add(ktime_get(), pcc_subspace->deadline); + u32 cap_status; + u16 status; + u32 ret; + + while (!ktime_after(ktime_get(), next_deadline)) { + /* + * As per ACPI spec, the PCC space will be initialized by + * platform and should have set the command completion bit when + * PCC can be used by OSPM + */ + status = readw_relaxed(&generic_comm_base->status); + if (status & RAS2_PCC_CMD_ERROR) { + cap_status = readw_relaxed(&generic_comm_base->set_capabilities_status); + ret = ras2_report_cap_error(cap_status); + + status &= ~RAS2_PCC_CMD_ERROR; + writew_relaxed(status, &generic_comm_base->status); + return ret; + } + if (status & RAS2_PCC_CMD_COMPLETE) + return 0; + /* + * Reducing the bus traffic in case this loop takes longer than + * a few retries. + */ + msleep(10); + } + + return -EIO; +} + +/** + * ras2_send_pcc_cmd() - Send RAS2 command via PCC channel + * @ras2_ctx: pointer to the RAS2 context structure + * @cmd: command to send + * + * Returns: 0 on success, an error otherwise + */ +int ras2_send_pcc_cmd(struct ras2_mem_ctx *ras2_ctx, u16 cmd) +{ + struct ras2_pcc_subspace *pcc_subspace = ras2_ctx->pcc_subspace; + struct acpi_ras2_shared_memory *generic_comm_base = pcc_subspace->pcc_comm_addr; + static ktime_t last_cmd_cmpl_time, last_mpar_reset; + struct mbox_chan *pcc_channel; + unsigned int time_delta; + static int mpar_count; + int ret; + + guard(mutex)(&ras2_pcc_subspace_lock); + ret = ras2_check_pcc_chan(pcc_subspace); + if (ret < 0) + return ret; + pcc_channel = pcc_subspace->pcc_chan->mchan; + + /* + * Handle the Minimum Request Turnaround Time(MRTT) + * "The minimum amount of time that OSPM must wait after the completion + * of a command before issuing the next command, in microseconds" + */ + if (pcc_subspace->pcc_mrtt) { + time_delta = ktime_us_delta(ktime_get(), last_cmd_cmpl_time); + if (pcc_subspace->pcc_mrtt > time_delta) + udelay(pcc_subspace->pcc_mrtt - time_delta); + } + + /* + * Handle the non-zero Maximum Periodic Access Rate(MPAR) + * "The maximum number of periodic requests that the subspace channel can + * support, reported in commands per minute. 0 indicates no limitation." + * + * This parameter should be ideally zero or large enough so that it can + * handle maximum number of requests that all the cores in the system can + * collectively generate. If it is not, we will follow the spec and just + * not send the request to the platform after hitting the MPAR limit in + * any 60s window + */ + if (pcc_subspace->pcc_mpar) { + if (mpar_count == 0) { + time_delta = ktime_ms_delta(ktime_get(), last_mpar_reset); + if (time_delta < 60 * MSEC_PER_SEC) { + dev_dbg(ras2_ctx->dev, + "PCC cmd not sent due to MPAR limit"); + return -EIO; + } + last_mpar_reset = ktime_get(); + mpar_count = pcc_subspace->pcc_mpar; + } + mpar_count--; + } + + /* Write to the shared comm region. */ + writew_relaxed(cmd, &generic_comm_base->command); + + /* Flip CMD COMPLETE bit */ + writew_relaxed(0, &generic_comm_base->status); + + /* Ring doorbell */ + ret = mbox_send_message(pcc_channel, &cmd); + if (ret < 0) { + dev_err(ras2_ctx->dev, + "Err sending PCC mbox message. cmd:%d, ret:%d\n", + cmd, ret); + return ret; + } + + /* + * If Minimum Request Turnaround Time is non-zero, we need + * to record the completion time of both READ and WRITE + * command for proper handling of MRTT, so we need to check + * for pcc_mrtt in addition to CMD_READ + */ + if (cmd == RAS2_PCC_CMD_EXEC || pcc_subspace->pcc_mrtt) { + ret = ras2_check_pcc_chan(pcc_subspace); + if (pcc_subspace->pcc_mrtt) + last_cmd_cmpl_time = ktime_get(); + } + + if (pcc_channel->mbox->txdone_irq) + mbox_chan_txdone(pcc_channel, ret); + else + mbox_client_txdone(pcc_channel, ret); + + return ret >= 0 ? 0 : ret; +} +EXPORT_SYMBOL_GPL(ras2_send_pcc_cmd); + +static int ras2_register_pcc_channel(struct ras2_mem_ctx *ras2_ctx, int pcc_subspace_id) +{ + struct ras2_pcc_subspace *pcc_subspace; + struct acpi_pcct_hw_reduced *ras2_ss; + struct pcc_mbox_chan *pcc_chan; + struct mbox_client *mbox_cl; + + if (pcc_subspace_id < 0) + return -EINVAL; + + mutex_lock(&ras2_pcc_subspace_lock); + list_for_each_entry(pcc_subspace, &ras2_pcc_subspaces, elem) { + if (pcc_subspace->pcc_subspace_id == pcc_subspace_id) { + ras2_ctx->pcc_subspace = pcc_subspace; + pcc_subspace->ref_count++; + mutex_unlock(&ras2_pcc_subspace_lock); + return 0; + } + } + mutex_unlock(&ras2_pcc_subspace_lock); + + pcc_subspace = kcalloc(1, sizeof(*pcc_subspace), GFP_KERNEL); + if (!pcc_subspace) + return -ENOMEM; + mbox_cl = &pcc_subspace->mbox_client; + mbox_cl->knows_txdone = true; + + pcc_chan = pcc_mbox_request_channel(mbox_cl, pcc_subspace_id); + if (IS_ERR(pcc_chan)) { + kfree(pcc_subspace); + return PTR_ERR(pcc_chan); + } + ras2_ss = pcc_chan->mchan->con_priv; + *pcc_subspace = (struct ras2_pcc_subspace) { + .pcc_subspace_id = pcc_subspace_id, + .pcc_chan = pcc_chan, + .pcc_comm_addr = acpi_os_ioremap(ras2_ss->base_address, + ras2_ss->length), + .deadline = ns_to_ktime(RAS2_NUM_RETRIES * + ras2_ss->latency * + NSEC_PER_USEC), + .pcc_mrtt = ras2_ss->min_turnaround_time, + .pcc_mpar = ras2_ss->max_access_rate, + .mbox_client = { + .knows_txdone = true, + }, + .pcc_channel_acquired = true, + }; + mutex_lock(&ras2_pcc_subspace_lock); + list_add(&pcc_subspace->elem, &ras2_pcc_subspaces); + pcc_subspace->ref_count++; + mutex_unlock(&ras2_pcc_subspace_lock); + ras2_ctx->pcc_subspace = pcc_subspace; + ras2_ctx->pcc_comm_addr = pcc_subspace->pcc_comm_addr; + ras2_ctx->dev = pcc_chan->mchan->mbox->dev; + + return 0; +} + +static DEFINE_IDA(ras2_ida); +static void ras2_remove_pcc(struct ras2_mem_ctx *ras2_ctx) +{ + struct ras2_pcc_subspace *pcc_subspace = ras2_ctx->pcc_subspace; + + guard(mutex)(&ras2_pcc_subspace_lock); + if (pcc_subspace->ref_count > 0) + pcc_subspace->ref_count--; + if (!pcc_subspace->ref_count) { + list_del(&pcc_subspace->elem); + pcc_mbox_free_channel(pcc_subspace->pcc_chan); + kfree(pcc_subspace); + } +} + +static void ras2_release(struct device *device) +{ + struct auxiliary_device *auxdev = container_of(device, struct auxiliary_device, dev); + struct ras2_mem_ctx *ras2_ctx = container_of(auxdev, struct ras2_mem_ctx, adev); + + ida_free(&ras2_ida, auxdev->id); + ras2_remove_pcc(ras2_ctx); + kfree(ras2_ctx); +} + +static struct ras2_mem_ctx *ras2_add_aux_device(char *name, int channel) +{ + struct ras2_mem_ctx *ras2_ctx; + int id, ret; + + ras2_ctx = kzalloc(sizeof(*ras2_ctx), GFP_KERNEL); + if (!ras2_ctx) + return ERR_PTR(-ENOMEM); + + mutex_init(&ras2_ctx->lock); + + ret = ras2_register_pcc_channel(ras2_ctx, channel); + if (ret < 0) { + pr_debug("failed to register pcc channel ret=%d\n", ret); + goto ctx_free; + } + + id = ida_alloc(&ras2_ida, GFP_KERNEL); + if (id < 0) { + ret = id; + goto pcc_free; + } + ras2_ctx->id = id; + ras2_ctx->adev.id = id; + ras2_ctx->adev.name = RAS2_MEM_DEV_ID_NAME; + ras2_ctx->adev.dev.release = ras2_release; + ras2_ctx->adev.dev.parent = ras2_ctx->dev; + + ret = auxiliary_device_init(&ras2_ctx->adev); + if (ret) + goto ida_free; + + ret = auxiliary_device_add(&ras2_ctx->adev); + if (ret) { + auxiliary_device_uninit(&ras2_ctx->adev); + return ERR_PTR(ret); + } + + return ras2_ctx; + +ida_free: + ida_free(&ras2_ida, id); +pcc_free: + ras2_remove_pcc(ras2_ctx); +ctx_free: + kfree(ras2_ctx); + return ERR_PTR(ret); +} + +static int __init ras2_acpi_init(void) +{ + struct acpi_table_header *pAcpiTable = NULL; + struct acpi_ras2_pcc_desc *pcc_desc_list; + struct acpi_table_ras2 *pRas2Table; + struct ras2_mem_ctx *ras2_ctx; + int pcc_subspace_id; + acpi_size ras2_size; + acpi_status status; + u8 count = 0, i; + int ret = 0; + + status = acpi_get_table("RAS2", 0, &pAcpiTable); + if (ACPI_FAILURE(status) || !pAcpiTable) { + pr_err("ACPI RAS2 driver failed to initialize, get table failed\n"); + return -EINVAL; + } + + ras2_size = pAcpiTable->length; + if (ras2_size < sizeof(struct acpi_table_ras2)) { + pr_err("ACPI RAS2 table present but broken (too short #1)\n"); + ret = -EINVAL; + goto free_ras2_table; + } + + pRas2Table = (struct acpi_table_ras2 *)pAcpiTable; + if (pRas2Table->num_pcc_descs <= 0) { + pr_err("ACPI RAS2 table does not contain PCC descriptors\n"); + ret = -EINVAL; + goto free_ras2_table; + } + + pcc_desc_list = (struct acpi_ras2_pcc_desc *)(pRas2Table + 1); + /* Double scan for the case of only one actual controller */ + pcc_subspace_id = -1; + count = 0; + for (i = 0; i < pRas2Table->num_pcc_descs; i++, pcc_desc_list++) { + if (pcc_desc_list->feature_type != RAS2_FEATURE_TYPE_MEMORY) + continue; + if (pcc_subspace_id == -1) { + pcc_subspace_id = pcc_desc_list->channel_id; + count++; + } + if (pcc_desc_list->channel_id != pcc_subspace_id) + count++; + } + /* + * Workaround for the client platform with multiple scrub devices + * but uses single PCC subspace for communication. + */ + if (count == 1) { + /* Add auxiliary device and bind ACPI RAS2 memory driver */ + ras2_ctx = ras2_add_aux_device(RAS2_MEM_DEV_ID_NAME, pcc_subspace_id); + if (IS_ERR(ras2_ctx)) { + ret = PTR_ERR(ras2_ctx); + goto free_ras2_table; + } + acpi_put_table(pAcpiTable); + return 0; + } + + pcc_desc_list = (struct acpi_ras2_pcc_desc *)(pRas2Table + 1); + count = 0; + for (i = 0; i < pRas2Table->num_pcc_descs; i++, pcc_desc_list++) { + if (pcc_desc_list->feature_type != RAS2_FEATURE_TYPE_MEMORY) + continue; + pcc_subspace_id = pcc_desc_list->channel_id; + /* Add auxiliary device and bind ACPI RAS2 memory driver */ + ras2_ctx = ras2_add_aux_device(RAS2_MEM_DEV_ID_NAME, pcc_subspace_id); + if (IS_ERR(ras2_ctx)) { + ret = PTR_ERR(ras2_ctx); + goto free_ras2_table; + } + } + +free_ras2_table: + acpi_put_table(pAcpiTable); + return ret; +} +late_initcall(ras2_acpi_init) diff --git a/include/acpi/ras2_acpi.h b/include/acpi/ras2_acpi.h new file mode 100644 index 000000000000..7b32407ae2af --- /dev/null +++ b/include/acpi/ras2_acpi.h @@ -0,0 +1,45 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * RAS2 ACPI driver header file + * + * (C) Copyright 2014, 2015 Hewlett-Packard Enterprises + * + * Copyright (c) 2024 HiSilicon Limited + */ + +#ifndef _RAS2_ACPI_H +#define _RAS2_ACPI_H + +#include +#include +#include +#include +#include + +#define RAS2_PCC_CMD_COMPLETE BIT(0) +#define RAS2_PCC_CMD_ERROR BIT(2) + +/* RAS2 specific PCC commands */ +#define RAS2_PCC_CMD_EXEC 0x01 + +#define RAS2_AUX_DEV_NAME "ras2" +#define RAS2_MEM_DEV_ID_NAME "acpi_ras2_mem" + +/* Data structure RAS2 table */ +struct ras2_mem_ctx { + struct auxiliary_device adev; + /* Lock to provide mutually exclusive access to PCC channel */ + struct mutex lock; + int id; + u8 instance; + bool bg; + u64 base, size; + u8 scrub_cycle_hrs, min_scrub_cycle, max_scrub_cycle; + struct device *dev; + struct device *scrub_dev; + void *pcc_subspace; + struct acpi_ras2_shared_memory __iomem *pcc_comm_addr; +}; + +int ras2_send_pcc_cmd(struct ras2_mem_ctx *ras2_ctx, u16 cmd); +#endif /* _RAS2_ACPI_H */ From patchwork Fri Nov 1 09:17:28 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Shiju Jose X-Patchwork-Id: 13858983 Received: from frasgout.his.huawei.com (frasgout.his.huawei.com [185.176.79.56]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 7342B19CCF5; Fri, 1 Nov 2024 09:18:22 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=185.176.79.56 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1730452705; cv=none; b=ue3n5k9sdj1+uxcHUi/ugur7U/ZYPiJQ610bT7G7r8IYW7G0jiPus8si6klgWKZfKN+snqaDipF2ob/2SssspYvC5Wn/5Uz3ByLfmWcYSU5KUmSRNpXAIcdwx8M9gK+MgklEDViFn8Q1Zgd6MAM/uUNE1JSL54DBnwZdxawahpw= ARC-Message-Signature: i=1; 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Fri, 1 Nov 2024 17:18:20 +0800 (CST) Received: from P_UKIT01-A7bmah.china.huawei.com (10.126.171.129) by frapeml500007.china.huawei.com (7.182.85.172) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.1.2507.39; Fri, 1 Nov 2024 10:18:17 +0100 From: To: , , , , CC: , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , Subject: [PATCH v15 10/15] ras: mem: Add memory ACPI RAS2 driver Date: Fri, 1 Nov 2024 09:17:28 +0000 Message-ID: <20241101091735.1465-11-shiju.jose@huawei.com> X-Mailer: git-send-email 2.43.0.windows.1 In-Reply-To: <20241101091735.1465-1-shiju.jose@huawei.com> References: <20241101091735.1465-1-shiju.jose@huawei.com> Precedence: bulk X-Mailing-List: linux-acpi@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-ClientProxiedBy: lhrpeml500004.china.huawei.com (7.191.163.9) To frapeml500007.china.huawei.com (7.182.85.172) From: Shiju Jose Memory ACPI RAS2 auxiliary driver binds to the auxiliary device add by the ACPI RAS2 table parser. Driver uses a PCC subspace for communicating with the ACPI compliant platform. Device with ACPI RAS2 scrub feature registers with EDAC device driver, which retrieves the scrub descriptor from EDAC scrub and exposes the scrub control attributes for RAS2 scrub instance to userspace in /sys/bus/edac/devices/acpi_ras_mem0/scrubX/. Co-developed-by: Jonathan Cameron Signed-off-by: Jonathan Cameron Signed-off-by: Shiju Jose --- drivers/ras/Kconfig | 10 ++ drivers/ras/Makefile | 1 + drivers/ras/acpi_ras2.c | 385 ++++++++++++++++++++++++++++++++++++++++ 3 files changed, 396 insertions(+) create mode 100644 drivers/ras/acpi_ras2.c diff --git a/drivers/ras/Kconfig b/drivers/ras/Kconfig index fc4f4bb94a4c..b77790bdc73a 100644 --- a/drivers/ras/Kconfig +++ b/drivers/ras/Kconfig @@ -46,4 +46,14 @@ config RAS_FMPM Memory will be retired during boot time and run time depending on platform-specific policies. +config MEM_ACPI_RAS2 + tristate "Memory ACPI RAS2 driver" + depends on ACPI_RAS2 + depends on EDAC + help + The driver binds to the platform device added by the ACPI RAS2 + table parser. Use a PCC channel subspace for communicating with + the ACPI compliant platform to provide control of memory scrub + parameters to the user via the EDAC scrub. + endif diff --git a/drivers/ras/Makefile b/drivers/ras/Makefile index 11f95d59d397..a0e6e903d6b0 100644 --- a/drivers/ras/Makefile +++ b/drivers/ras/Makefile @@ -2,6 +2,7 @@ obj-$(CONFIG_RAS) += ras.o obj-$(CONFIG_DEBUG_FS) += debugfs.o obj-$(CONFIG_RAS_CEC) += cec.o +obj-$(CONFIG_MEM_ACPI_RAS2) += acpi_ras2.o obj-$(CONFIG_RAS_FMPM) += amd/fmpm.o obj-y += amd/atl/ diff --git a/drivers/ras/acpi_ras2.c b/drivers/ras/acpi_ras2.c new file mode 100644 index 000000000000..a73158e424a2 --- /dev/null +++ b/drivers/ras/acpi_ras2.c @@ -0,0 +1,385 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * ACPI RAS2 memory driver + * + * Copyright (c) 2024 HiSilicon Limited. + * + */ + +#define pr_fmt(fmt) "MEMORY ACPI RAS2: " fmt + +#include +#include +#include +#include + +#define RAS2_DEV_NUM_RAS_FEATURES 1 + +#define RAS2_SUPPORT_HW_PARTOL_SCRUB BIT(0) +#define RAS2_TYPE_PATROL_SCRUB 0x0000 + +#define RAS2_GET_PATROL_PARAMETERS 0x01 +#define RAS2_START_PATROL_SCRUBBER 0x02 +#define RAS2_STOP_PATROL_SCRUBBER 0x03 + +#define RAS2_PATROL_SCRUB_SCHRS_IN_MASK GENMASK(15, 8) +#define RAS2_PATROL_SCRUB_EN_BACKGROUND BIT(0) +#define RAS2_PATROL_SCRUB_SCHRS_OUT_MASK GENMASK(7, 0) +#define RAS2_PATROL_SCRUB_MIN_SCHRS_OUT_MASK GENMASK(15, 8) +#define RAS2_PATROL_SCRUB_MAX_SCHRS_OUT_MASK GENMASK(23, 16) +#define RAS2_PATROL_SCRUB_FLAG_SCRUBBER_RUNNING BIT(0) + +#define RAS2_SCRUB_NAME_LEN 128 +#define RAS2_HOUR_IN_SECS 3600 + +struct acpi_ras2_ps_shared_mem { + struct acpi_ras2_shared_memory common; + struct acpi_ras2_patrol_scrub_parameter params; +}; + +static int ras2_is_patrol_scrub_support(struct ras2_mem_ctx *ras2_ctx) +{ + struct acpi_ras2_shared_memory __iomem *common = (void *) + ras2_ctx->pcc_comm_addr; + + guard(mutex)(&ras2_ctx->lock); + common->set_capabilities[0] = 0; + + return common->features[0] & RAS2_SUPPORT_HW_PARTOL_SCRUB; +} + +static int ras2_update_patrol_scrub_params_cache(struct ras2_mem_ctx *ras2_ctx) +{ + struct acpi_ras2_ps_shared_mem __iomem *ps_sm = (void *) + ras2_ctx->pcc_comm_addr; + int ret; + + ps_sm->common.set_capabilities[0] = RAS2_SUPPORT_HW_PARTOL_SCRUB; + ps_sm->params.patrol_scrub_command = RAS2_GET_PATROL_PARAMETERS; + + ret = ras2_send_pcc_cmd(ras2_ctx, RAS2_PCC_CMD_EXEC); + if (ret) { + dev_err(ras2_ctx->dev, "failed to read parameters\n"); + return ret; + } + + ras2_ctx->min_scrub_cycle = FIELD_GET(RAS2_PATROL_SCRUB_MIN_SCHRS_OUT_MASK, + ps_sm->params.scrub_params_out); + ras2_ctx->max_scrub_cycle = FIELD_GET(RAS2_PATROL_SCRUB_MAX_SCHRS_OUT_MASK, + ps_sm->params.scrub_params_out); + if (!ras2_ctx->bg) { + ras2_ctx->base = ps_sm->params.actual_address_range[0]; + ras2_ctx->size = ps_sm->params.actual_address_range[1]; + } + ras2_ctx->scrub_cycle_hrs = FIELD_GET(RAS2_PATROL_SCRUB_SCHRS_OUT_MASK, + ps_sm->params.scrub_params_out); + + return 0; +} + +/* Context - lock must be held */ +static int ras2_get_patrol_scrub_running(struct ras2_mem_ctx *ras2_ctx, + bool *running) +{ + struct acpi_ras2_ps_shared_mem __iomem *ps_sm = (void *) + ras2_ctx->pcc_comm_addr; + int ret; + + ps_sm->common.set_capabilities[0] = RAS2_SUPPORT_HW_PARTOL_SCRUB; + ps_sm->params.patrol_scrub_command = RAS2_GET_PATROL_PARAMETERS; + + ret = ras2_send_pcc_cmd(ras2_ctx, RAS2_PCC_CMD_EXEC); + if (ret) { + dev_err(ras2_ctx->dev, "failed to read parameters\n"); + return ret; + } + + *running = ps_sm->params.flags & RAS2_PATROL_SCRUB_FLAG_SCRUBBER_RUNNING; + + return 0; +} + +static int ras2_hw_scrub_read_min_scrub_cycle(struct device *dev, void *drv_data, + u32 *min) +{ + struct ras2_mem_ctx *ras2_ctx = drv_data; + + *min = ras2_ctx->min_scrub_cycle * RAS2_HOUR_IN_SECS; + + return 0; +} + +static int ras2_hw_scrub_read_max_scrub_cycle(struct device *dev, void *drv_data, + u32 *max) +{ + struct ras2_mem_ctx *ras2_ctx = drv_data; + + *max = ras2_ctx->max_scrub_cycle * RAS2_HOUR_IN_SECS; + + return 0; +} + +static int ras2_hw_scrub_cycle_read(struct device *dev, void *drv_data, + u32 *scrub_cycle_secs) +{ + struct ras2_mem_ctx *ras2_ctx = drv_data; + + *scrub_cycle_secs = ras2_ctx->scrub_cycle_hrs * RAS2_HOUR_IN_SECS; + + return 0; +} + +static int ras2_hw_scrub_cycle_write(struct device *dev, void *drv_data, + u32 scrub_cycle_secs) +{ + u8 scrub_cycle_hrs = scrub_cycle_secs / RAS2_HOUR_IN_SECS; + struct ras2_mem_ctx *ras2_ctx = drv_data; + bool running; + int ret; + + guard(mutex)(&ras2_ctx->lock); + ret = ras2_get_patrol_scrub_running(ras2_ctx, &running); + if (ret) + return ret; + + if (running) + return -EBUSY; + + if (scrub_cycle_hrs < ras2_ctx->min_scrub_cycle || + scrub_cycle_hrs > ras2_ctx->max_scrub_cycle) + return -EINVAL; + + ras2_ctx->scrub_cycle_hrs = scrub_cycle_hrs; + + return 0; +} + +static int ras2_hw_scrub_read_addr(struct device *dev, void *drv_data, u64 *base) +{ + struct ras2_mem_ctx *ras2_ctx = drv_data; + int ret; + + /* + * When BG scrubbing is enabled the actual address range is not valid. + * Return -EBUSY now unless find out a method to retrieve actual full PA range. + */ + if (ras2_ctx->bg) + return -EBUSY; + + /* + * When demand scrubbing is finished firmware must reset actual + * address range to 0. Otherwise userspace assumes demand scrubbing + * is in progress. + */ + ret = ras2_update_patrol_scrub_params_cache(ras2_ctx); + if (ret) + return ret; + *base = ras2_ctx->base; + + return 0; +} + +static int ras2_hw_scrub_read_size(struct device *dev, void *drv_data, u64 *size) +{ + struct ras2_mem_ctx *ras2_ctx = drv_data; + int ret; + + if (ras2_ctx->bg) + return -EBUSY; + + ret = ras2_update_patrol_scrub_params_cache(ras2_ctx); + if (ret) + return ret; + *size = ras2_ctx->size; + + return 0; +} + +static int ras2_hw_scrub_write_addr(struct device *dev, void *drv_data, u64 base) +{ + struct ras2_mem_ctx *ras2_ctx = drv_data; + struct acpi_ras2_ps_shared_mem __iomem *ps_sm = (void *) + ras2_ctx->pcc_comm_addr; + bool running; + int ret; + + guard(mutex)(&ras2_ctx->lock); + ps_sm->common.set_capabilities[0] = RAS2_SUPPORT_HW_PARTOL_SCRUB; + if (ras2_ctx->bg) + return -EBUSY; + + if (!base || !ras2_ctx->size) { + dev_warn(ras2_ctx->dev, + "%s: Invalid address range, base=0x%llx " + "size=0x%llx\n", __func__, + base, ras2_ctx->size); + return -ERANGE; + } + + ret = ras2_get_patrol_scrub_running(ras2_ctx, &running); + if (ret) + return ret; + + if (running) + return -EBUSY; + + ps_sm->params.scrub_params_in &= ~RAS2_PATROL_SCRUB_SCHRS_IN_MASK; + ps_sm->params.scrub_params_in |= FIELD_PREP(RAS2_PATROL_SCRUB_SCHRS_IN_MASK, + ras2_ctx->scrub_cycle_hrs); + ps_sm->params.requested_address_range[0] = base; + ps_sm->params.requested_address_range[1] = ras2_ctx->size; + ps_sm->params.scrub_params_in &= ~RAS2_PATROL_SCRUB_EN_BACKGROUND; + ps_sm->params.patrol_scrub_command = RAS2_START_PATROL_SCRUBBER; + + ret = ras2_send_pcc_cmd(ras2_ctx, RAS2_PCC_CMD_EXEC); + if (ret) { + dev_err(ras2_ctx->dev, "Failed to start demand scrubbing\n"); + return ret; + } + + return ras2_update_patrol_scrub_params_cache(ras2_ctx); +} + +static int ras2_hw_scrub_write_size(struct device *dev, void *drv_data, u64 size) +{ + struct ras2_mem_ctx *ras2_ctx = drv_data; + bool running; + int ret; + + guard(mutex)(&ras2_ctx->lock); + ret = ras2_get_patrol_scrub_running(ras2_ctx, &running); + if (ret) + return ret; + + if (running) + return -EBUSY; + + if (!size) { + dev_warn(dev, "%s: Invalid address range size=0x%llx\n", + __func__, size); + return -EINVAL; + } + + ras2_ctx->size = size; + + return 0; +} + +static int ras2_hw_scrub_set_enabled_bg(struct device *dev, void *drv_data, bool enable) +{ + struct ras2_mem_ctx *ras2_ctx = drv_data; + struct acpi_ras2_ps_shared_mem __iomem *ps_sm = (void *) + ras2_ctx->pcc_comm_addr; + bool running; + int ret; + + guard(mutex)(&ras2_ctx->lock); + ps_sm->common.set_capabilities[0] = RAS2_SUPPORT_HW_PARTOL_SCRUB; + ret = ras2_get_patrol_scrub_running(ras2_ctx, &running); + if (ret) + return ret; + if (enable) { + if (ras2_ctx->bg || running) + return -EBUSY; + ps_sm->params.requested_address_range[0] = 0; + ps_sm->params.requested_address_range[1] = 0; + ps_sm->params.scrub_params_in &= ~RAS2_PATROL_SCRUB_SCHRS_IN_MASK; + ps_sm->params.scrub_params_in |= FIELD_PREP(RAS2_PATROL_SCRUB_SCHRS_IN_MASK, + ras2_ctx->scrub_cycle_hrs); + ps_sm->params.patrol_scrub_command = RAS2_START_PATROL_SCRUBBER; + } else { + if (!ras2_ctx->bg) + return -EPERM; + if (!ras2_ctx->bg && running) + return -EBUSY; + ps_sm->params.patrol_scrub_command = RAS2_STOP_PATROL_SCRUBBER; + } + ps_sm->params.scrub_params_in &= ~RAS2_PATROL_SCRUB_EN_BACKGROUND; + ps_sm->params.scrub_params_in |= FIELD_PREP(RAS2_PATROL_SCRUB_EN_BACKGROUND, + enable); + ret = ras2_send_pcc_cmd(ras2_ctx, RAS2_PCC_CMD_EXEC); + if (ret) { + dev_err(ras2_ctx->dev, "Failed to %s background scrubbing\n", + enable ? "enable" : "disable"); + return ret; + } + if (enable) { + ras2_ctx->bg = true; + /* Update the cache to account for rounding of supplied parameters and similar */ + ret = ras2_update_patrol_scrub_params_cache(ras2_ctx); + } else { + ret = ras2_update_patrol_scrub_params_cache(ras2_ctx); + ras2_ctx->bg = false; + } + + return ret; +} + +static int ras2_hw_scrub_get_enabled_bg(struct device *dev, void *drv_data, bool *enabled) +{ + struct ras2_mem_ctx *ras2_ctx = drv_data; + + *enabled = ras2_ctx->bg; + + return 0; +} + +static const struct edac_scrub_ops ras2_scrub_ops = { + .read_addr = ras2_hw_scrub_read_addr, + .read_size = ras2_hw_scrub_read_size, + .write_addr = ras2_hw_scrub_write_addr, + .write_size = ras2_hw_scrub_write_size, + .get_enabled_bg = ras2_hw_scrub_get_enabled_bg, + .set_enabled_bg = ras2_hw_scrub_set_enabled_bg, + .get_min_cycle = ras2_hw_scrub_read_min_scrub_cycle, + .get_max_cycle = ras2_hw_scrub_read_max_scrub_cycle, + .get_cycle_duration = ras2_hw_scrub_cycle_read, + .set_cycle_duration = ras2_hw_scrub_cycle_write, +}; + +static int ras2_probe(struct auxiliary_device *auxdev, + const struct auxiliary_device_id *id) +{ + struct ras2_mem_ctx *ras2_ctx = container_of(auxdev, struct ras2_mem_ctx, adev); + struct edac_dev_feature ras_features[RAS2_DEV_NUM_RAS_FEATURES]; + char scrub_name[RAS2_SCRUB_NAME_LEN]; + int num_ras_features = 0; + int ret; + + if (!ras2_is_patrol_scrub_support(ras2_ctx)) + return -EOPNOTSUPP; + + ret = ras2_update_patrol_scrub_params_cache(ras2_ctx); + if (ret) + return ret; + + snprintf(scrub_name, sizeof(scrub_name), "acpi_ras_mem%d", + ras2_ctx->id); + + ras_features[num_ras_features].ft_type = RAS_FEAT_SCRUB; + ras_features[num_ras_features].instance = ras2_ctx->instance; + ras_features[num_ras_features].scrub_ops = &ras2_scrub_ops; + ras_features[num_ras_features].ctx = ras2_ctx; + num_ras_features++; + + return edac_dev_register(&auxdev->dev, scrub_name, NULL, + num_ras_features, ras_features); +} + +static const struct auxiliary_device_id ras2_mem_dev_id_table[] = { + { .name = RAS2_AUX_DEV_NAME "." RAS2_MEM_DEV_ID_NAME, }, + { }, +}; + +MODULE_DEVICE_TABLE(auxiliary, ras2_mem_dev_id_table); + +static struct auxiliary_driver ras2_mem_driver = { + .name = RAS2_MEM_DEV_ID_NAME, + .probe = ras2_probe, + .id_table = ras2_mem_dev_id_table, +}; +module_auxiliary_driver(ras2_mem_driver); + +MODULE_IMPORT_NS(ACPI_RAS2); +MODULE_DESCRIPTION("ACPI RAS2 memory driver"); +MODULE_LICENSE("GPL"); From patchwork Fri Nov 1 09:17:29 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Shiju Jose X-Patchwork-Id: 13858984 Received: from frasgout.his.huawei.com (frasgout.his.huawei.com [185.176.79.56]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 10B2E19DF45; Fri, 1 Nov 2024 09:18:25 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=185.176.79.56 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1730452709; cv=none; b=f3smnqjwpuwQ56lHxjxPHCPdnnKwhwk/tX1dKfVMssczN8UH+iGTPU6fJZlga0chI8TPy7AcdtWh2Q4Cu2hgeWqcUYkiwa3liy6UEDyhgaevsd4SCY5b6qQ8LDxeC7gI6HORUSF+MepaUdaoh1H1R/zNBIMa8y9+JI/GdgOBPpY= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1730452709; c=relaxed/simple; bh=6WXrAaE+o6LZVQvMtRCvY+T7+wP2nYaslDUX6rZ2Vt0=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=rU9BncYbTjacjX53GHPfdbnoj75vuuDnEGSjeCMiG5+h7DyRyaJzyu3WSiuqCDnXm8aWZsDHnYNMMBZOVDCxe9XtnQKcuywSaVHDPeEYK404lecCbndMJC29xugtTzbiEBJL4rLTU22FllOUU4LdaSgX111mcdnYC6dA9GK+mxI= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=huawei.com; spf=pass smtp.mailfrom=huawei.com; arc=none smtp.client-ip=185.176.79.56 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=huawei.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=huawei.com Received: from mail.maildlp.com (unknown [172.18.186.216]) by frasgout.his.huawei.com (SkyGuard) with ESMTP id 4XfwGz6VTkz6HJy0; Fri, 1 Nov 2024 17:16:59 +0800 (CST) Received: from frapeml500007.china.huawei.com (unknown [7.182.85.172]) by mail.maildlp.com (Postfix) with ESMTPS id 4B994140A36; Fri, 1 Nov 2024 17:18:23 +0800 (CST) Received: from P_UKIT01-A7bmah.china.huawei.com (10.126.171.129) by frapeml500007.china.huawei.com (7.182.85.172) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.1.2507.39; Fri, 1 Nov 2024 10:18:21 +0100 From: To: , , , , CC: , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , Subject: [PATCH v15 11/15] EDAC: Add memory repair control feature Date: Fri, 1 Nov 2024 09:17:29 +0000 Message-ID: <20241101091735.1465-12-shiju.jose@huawei.com> X-Mailer: git-send-email 2.43.0.windows.1 In-Reply-To: <20241101091735.1465-1-shiju.jose@huawei.com> References: <20241101091735.1465-1-shiju.jose@huawei.com> Precedence: bulk X-Mailing-List: linux-acpi@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-ClientProxiedBy: lhrpeml500004.china.huawei.com (7.191.163.9) To frapeml500007.china.huawei.com (7.182.85.172) From: Shiju Jose Add generic EDAC memory repair control, eg. PPR(Post Package Repair), memory sparing etc, control driver in order to control memory repairs in the system. Supports sPPR(soft PPR), hPPR(hard PPR), soft/hard memory sparing, memory sparing at cacheline/row/bank/rank granularity etc. Device with memory repair features registers with EDAC device driver, which retrieves memory repair descriptor from EDAC memory repair driver and exposes the sysfs repair control attributes to userspace in /sys/bus/edac/devices//mem_repairX/. The common memory repair control interface abstracts the control of arbitrary memory repair functionality into a standardized set of functions. The sysfs memory repair attribute nodes are only available if the client driver has implemented the corresponding attribute callback function and provided operations to the EDAC device driver during registration. Signed-off-by: Shiju Jose --- .../ABI/testing/sysfs-edac-memory-repair | 168 ++++++++ drivers/edac/Makefile | 2 +- drivers/edac/edac_device.c | 32 ++ drivers/edac/mem_repair.c | 367 ++++++++++++++++++ include/linux/edac.h | 87 +++++ 5 files changed, 655 insertions(+), 1 deletion(-) create mode 100644 Documentation/ABI/testing/sysfs-edac-memory-repair create mode 100755 drivers/edac/mem_repair.c diff --git a/Documentation/ABI/testing/sysfs-edac-memory-repair b/Documentation/ABI/testing/sysfs-edac-memory-repair new file mode 100644 index 000000000000..393206b8d418 --- /dev/null +++ b/Documentation/ABI/testing/sysfs-edac-memory-repair @@ -0,0 +1,168 @@ +What: /sys/bus/edac/devices//mem_repairX +Date: Jan 2025 +KernelVersion: 6.13 +Contact: linux-edac@vger.kernel.org +Description: + The sysfs EDAC bus devices //mem_repairX subdirectory + pertains to the memory media repair features control, such as + PPR (Post Package Repair), memory sparing etc, where + directory corresponds to a device registered with the EDAC + device driver for the memory repair features. + Memory sparing is a repair function that replaces a portion + of memory (spared memory) with a portion of functional memory. + Memory sparing has cacheline/row/bank/rank sparing + granularities. + The sysfs attributes nodes for a repair feature are only + present if the parent driver has implemented the corresponding + attr callback function and provided the necessary operations + to the EDAC device driver during registration. + +What: /sys/bus/edac/devices//mem_repairX/repair_type +Date: Jan 2025 +KernelVersion: 6.13 +Contact: linux-edac@vger.kernel.org +Description: + (RO) Type of the repair instance. For eg. sPPR, hPPR, cacheline/ + row/bank/rank memory sparing etc. + 0 - Soft PPR(sPPR) + 1 - Hard PPR(hPPR) + 2 - Cacheline memory sparing + 3 - Row memory sparing + 4 - Bank memory sparing + 5 - Rank memory sparing + All other values are reserved. + +What: /sys/bus/edac/devices//mem_repairX/persist_mode_avail +Date: Jan 2025 +KernelVersion: 6.13 +Contact: linux-edac@vger.kernel.org +Description: + (RO) Persist repair modes supported in the device. + 0 - Soft PPR(sPPR)/soft memory sparing (temporary repair). + 1 - Hard PPR(hPPR)/hard memory sparing (permanent repair). + All other values are reserved. + +What: /sys/bus/edac/devices//mem_repairX/persist_mode +Date: Jan 2025 +KernelVersion: 6.13 +Contact: linux-edac@vger.kernel.org +Description: + (RW) Current persist repair mode. + 0 - Soft PPR(sPPR)/soft memory sparing (temporary repair). + 1 - Hard PPR(hPPR)/hard memory sparing (permanent repair). + All other values are reserved. + +What: /sys/bus/edac/devices//mem_repairX/dpa_support +Date: Jan 2025 +KernelVersion: 6.13 +Contact: linux-edac@vger.kernel.org +Description: + (RO) True if supports DPA for a repair operation. + E.g. PPR, memory sparing. + +What: /sys/bus/edac/devices//mem_repairX/repair_safe_when_in_use +Date: Jan 2025 +KernelVersion: 6.13 +Contact: linux-edac@vger.kernel.org +Description: + (RO) True if memory media is accessible and data is retained + during the memory repair operation. + +What: /sys/bus/edac/devices//mem_repairX/hpa +Date: Jan 2025 +KernelVersion: 6.13 +Contact: linux-edac@vger.kernel.org +Description: + (RW) HPA (Host Physical Address) for memory repair. + +What: /sys/bus/edac/devices//mem_repairX/dpa +Date: Jan 2025 +KernelVersion: 6.13 +Contact: linux-edac@vger.kernel.org +Description: + (RW) DPA (Device Physical Address) for memory repair. + +What: /sys/bus/edac/devices//mem_repairX/nibble_mask +Date: Jan 2025 +KernelVersion: 6.13 +Contact: linux-edac@vger.kernel.org +Description: + (RW) Nibble mask for memory repair. + +What: /sys/bus/edac/devices//mem_repairX/bank_group +Date: Jan 2025 +KernelVersion: 6.13 +Contact: linux-edac@vger.kernel.org +Description: + (RW) Memory bank group for repair. + +What: /sys/bus/edac/devices//mem_repairX/bank +Date: Jan 2025 +KernelVersion: 6.13 +Contact: linux-edac@vger.kernel.org +Description: + (RW) Memory bank for memory repair. + +What: /sys/bus/edac/devices//mem_repairX/rank +Date: Jan 2025 +KernelVersion: 6.13 +Contact: linux-edac@vger.kernel.org +Description: + (RW) Memory rank for repair. + +What: /sys/bus/edac/devices//mem_repairX/row +Date: Jan 2025 +KernelVersion: 6.13 +Contact: linux-edac@vger.kernel.org +Description: + (RW) Row for memory repair. + +What: /sys/bus/edac/devices//mem_repairX/column +Date: Jan 2025 +KernelVersion: 6.13 +Contact: linux-edac@vger.kernel.org +Description: + (RW) Column for memory repair. + +What: /sys/bus/edac/devices//mem_repairX/channel +Date: Jan 2025 +KernelVersion: 6.13 +Contact: linux-edac@vger.kernel.org +Description: + (RW) Channel for memory repair. + +What: /sys/bus/edac/devices//mem_repairX/sub_channel +Date: Jan 2025 +KernelVersion: 6.13 +Contact: linux-edac@vger.kernel.org +Description: + (RW) Sub-channel for memory repair. + +What: /sys/bus/edac/devices//mem_repairX/query +Date: Jan 2025 +KernelVersion: 6.13 +Contact: linux-edac@vger.kernel.org +Description: + (WO) Query whether the repair operation is supported for the + memory attributes set. Return failure if resources are + not available to perform repair. + 1 - issue query. + All other values are reserved. + +What: /sys/bus/edac/devices//mem_repairX/repair +Date: Jan 2025 +KernelVersion: 6.13 +Contact: linux-edac@vger.kernel.org +Description: + (WO) Start the memory repair operation for the memory attributes + set. Return failure if resources are not available to + perform repair. + 1 - issue repair operation. + All other values are reserved. + In some states of system configuration (e.g. before address + decoders have been configured), memory devices (e.g. CXL) + may not have an active mapping in the main host address + physical address map. As such, the memory to repair must be + identified by a device specific physical addressing scheme + using a DPA. The DPA to use will be presented in related + error records. diff --git a/drivers/edac/Makefile b/drivers/edac/Makefile index b24c2c112d9c..d037bce88487 100644 --- a/drivers/edac/Makefile +++ b/drivers/edac/Makefile @@ -10,7 +10,7 @@ obj-$(CONFIG_EDAC) := edac_core.o edac_core-y := edac_mc.o edac_device.o edac_mc_sysfs.o edac_core-y += edac_module.o edac_device_sysfs.o wq.o -edac_core-y += scrub.o ecs.o +edac_core-y += scrub.o ecs.o mem_repair.o edac_core-$(CONFIG_EDAC_DEBUG) += debugfs.o diff --git a/drivers/edac/edac_device.c b/drivers/edac/edac_device.c index bbf5b52a1ce1..9575b04a7454 100644 --- a/drivers/edac/edac_device.c +++ b/drivers/edac/edac_device.c @@ -576,6 +576,7 @@ static void edac_dev_release(struct device *dev) { struct edac_dev_feat_ctx *ctx = container_of(dev, struct edac_dev_feat_ctx, dev); + kfree(ctx->mem_repair); kfree(ctx->scrub); kfree(ctx->dev.groups); kfree(ctx); @@ -610,6 +611,7 @@ int edac_dev_register(struct device *parent, char *name, const struct edac_dev_feature *ras_features) { const struct attribute_group **ras_attr_groups; + int mem_repair_cnt = 0, mem_repair_inst = 0; int scrub_cnt = 0, scrub_inst = 0; struct edac_dev_data *dev_data; struct edac_dev_feat_ctx *ctx; @@ -626,6 +628,10 @@ int edac_dev_register(struct device *parent, char *name, attr_gcnt++; scrub_cnt++; break; + case RAS_FEAT_MEM_REPAIR: + attr_gcnt++; + mem_repair_cnt++; + break; case RAS_FEAT_ECS: attr_gcnt += ras_features[feat].ecs_info.num_media_frus; break; @@ -652,6 +658,14 @@ int edac_dev_register(struct device *parent, char *name, } } + if (mem_repair_cnt) { + ctx->mem_repair = kcalloc(mem_repair_cnt, sizeof(*ctx->mem_repair), GFP_KERNEL); + if (!ctx->mem_repair) { + ret = -ENOMEM; + goto groups_free; + } + } + attr_gcnt = 0; for (feat = 0; feat < num_features; feat++, ras_features++) { switch (ras_features->ft_type) { @@ -686,6 +700,23 @@ int edac_dev_register(struct device *parent, char *name, attr_gcnt += ras_features->ecs_info.num_media_frus; break; + case RAS_FEAT_MEM_REPAIR: + if (!ras_features->mem_repair_ops || + mem_repair_inst != ras_features->instance) + goto data_mem_free; + + dev_data = &ctx->mem_repair[mem_repair_inst]; + dev_data->instance = mem_repair_inst; + dev_data->mem_repair_ops = ras_features->mem_repair_ops; + dev_data->private = ras_features->ctx; + ret = edac_mem_repair_get_desc(parent, &ras_attr_groups[attr_gcnt], + ras_features->instance); + if (ret) + goto data_mem_free; + + mem_repair_inst++; + attr_gcnt++; + break; default: ret = -EINVAL; goto data_mem_free; @@ -712,6 +743,7 @@ int edac_dev_register(struct device *parent, char *name, return devm_add_action_or_reset(parent, edac_dev_unreg, &ctx->dev); data_mem_free: + kfree(ctx->mem_repair); kfree(ctx->scrub); groups_free: kfree(ras_attr_groups); diff --git a/drivers/edac/mem_repair.c b/drivers/edac/mem_repair.c new file mode 100755 index 000000000000..93246ad0c9eb --- /dev/null +++ b/drivers/edac/mem_repair.c @@ -0,0 +1,367 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * The generic EDAC memory repair driver is designed to control the memory + * devices with memory repair features, such as Post Package Repair (PPR), + * memory sparing etc. The common sysfs memory repair interface abstracts + * the control of various arbitrary memory repair functionalities into a + * unified set of functions. + * + * Copyright (c) 2024 HiSilicon Limited. + */ + +#include + +enum edac_mem_repair_attributes { + MEM_REPAIR_TYPE, + MEM_REPAIR_PERSIST_MODE_AVAIL, + MEM_REPAIR_PERSIST_MODE, + MEM_REPAIR_DPA_SUPPORT, + MEM_REPAIR_SAFE_IN_USE, + MEM_REPAIR_HPA, + MEM_REPAIR_DPA, + MEM_REPAIR_NIBBLE_MASK, + MEM_REPAIR_BANK_GROUP, + MEM_REPAIR_BANK, + MEM_REPAIR_RANK, + MEM_REPAIR_ROW, + MEM_REPAIR_COLUMN, + MEM_REPAIR_CHANNEL, + MEM_REPAIR_SUB_CHANNEL, + MEM_REPAIR_QUERY, + MEM_DO_REPAIR, + MEM_REPAIR_MAX_ATTRS +}; + +struct edac_mem_repair_dev_attr { + struct device_attribute dev_attr; + u8 instance; +}; + +struct edac_mem_repair_context { + char name[EDAC_FEAT_NAME_LEN]; + struct edac_mem_repair_dev_attr mem_repair_dev_attr[MEM_REPAIR_MAX_ATTRS]; + struct attribute *mem_repair_attrs[MEM_REPAIR_MAX_ATTRS + 1]; + struct attribute_group group; +}; + +#define TO_MEM_REPAIR_DEV_ATTR(_dev_attr) \ + container_of(_dev_attr, struct edac_mem_repair_dev_attr, dev_attr) + +#define EDAC_MEM_REPAIR_ATTR_SHOW(attrib, cb, type, format) \ +static ssize_t attrib##_show(struct device *ras_feat_dev, \ + struct device_attribute *attr, char *buf) \ +{ \ + u8 inst = TO_MEM_REPAIR_DEV_ATTR(attr)->instance; \ + struct edac_dev_feat_ctx *ctx = dev_get_drvdata(ras_feat_dev); \ + const struct edac_mem_repair_ops *ops = \ + ctx->mem_repair[inst].mem_repair_ops; \ + type data; \ + int ret; \ + \ + ret = ops->cb(ras_feat_dev->parent, ctx->mem_repair[inst].private, \ + &data); \ + if (ret) \ + return ret; \ + \ + return sysfs_emit(buf, format, data); \ +} + +EDAC_MEM_REPAIR_ATTR_SHOW(repair_type, get_repair_type, u32, "%u\n") +EDAC_MEM_REPAIR_ATTR_SHOW(persist_mode, get_persist_mode, u32, "%u\n") +EDAC_MEM_REPAIR_ATTR_SHOW(dpa_support, get_dpa_support, u32, "%u\n") +EDAC_MEM_REPAIR_ATTR_SHOW(repair_safe_when_in_use, get_repair_safe_when_in_use, u32, "%u\n") +EDAC_MEM_REPAIR_ATTR_SHOW(hpa, get_hpa, u64, "0x%llx\n") +EDAC_MEM_REPAIR_ATTR_SHOW(dpa, get_dpa, u64, "0x%llx\n") +EDAC_MEM_REPAIR_ATTR_SHOW(nibble_mask, get_nibble_mask, u64, "0x%llx\n") +EDAC_MEM_REPAIR_ATTR_SHOW(bank_group, get_bank_group, u32, "%u\n") +EDAC_MEM_REPAIR_ATTR_SHOW(bank, get_bank, u32, "%u\n") +EDAC_MEM_REPAIR_ATTR_SHOW(rank, get_rank, u32, "%u\n") +EDAC_MEM_REPAIR_ATTR_SHOW(row, get_row, u64, "0x%llx\n") +EDAC_MEM_REPAIR_ATTR_SHOW(column, get_column, u32, "%u\n") +EDAC_MEM_REPAIR_ATTR_SHOW(channel, get_channel, u32, "%u\n") +EDAC_MEM_REPAIR_ATTR_SHOW(sub_channel, get_sub_channel, u32, "%u\n") + +#define EDAC_MEM_REPAIR_ATTR_STORE(attrib, cb, type, conv_func) \ +static ssize_t attrib##_store(struct device *ras_feat_dev, \ + struct device_attribute *attr, \ + const char *buf, size_t len) \ +{ \ + u8 inst = TO_MEM_REPAIR_DEV_ATTR(attr)->instance; \ + struct edac_dev_feat_ctx *ctx = dev_get_drvdata(ras_feat_dev); \ + const struct edac_mem_repair_ops *ops = \ + ctx->mem_repair[inst].mem_repair_ops; \ + type data; \ + int ret; \ + \ + ret = conv_func(buf, 0, &data); \ + if (ret < 0) \ + return ret; \ + \ + ret = ops->cb(ras_feat_dev->parent, ctx->mem_repair[inst].private, \ + data); \ + if (ret) \ + return ret; \ + \ + return len; \ +} + +EDAC_MEM_REPAIR_ATTR_STORE(persist_mode, set_persist_mode, unsigned long, kstrtoul) +EDAC_MEM_REPAIR_ATTR_STORE(hpa, set_hpa, u64, kstrtou64) +EDAC_MEM_REPAIR_ATTR_STORE(dpa, set_dpa, u64, kstrtou64) +EDAC_MEM_REPAIR_ATTR_STORE(nibble_mask, set_nibble_mask, u64, kstrtou64) +EDAC_MEM_REPAIR_ATTR_STORE(bank_group, set_bank_group, unsigned long, kstrtoul) +EDAC_MEM_REPAIR_ATTR_STORE(bank, set_bank, unsigned long, kstrtoul) +EDAC_MEM_REPAIR_ATTR_STORE(rank, set_rank, unsigned long, kstrtoul) +EDAC_MEM_REPAIR_ATTR_STORE(row, set_row, u64, kstrtou64) +EDAC_MEM_REPAIR_ATTR_STORE(column, set_column, unsigned long, kstrtoul) +EDAC_MEM_REPAIR_ATTR_STORE(channel, set_channel, unsigned long, kstrtoul) +EDAC_MEM_REPAIR_ATTR_STORE(sub_channel, set_sub_channel, unsigned long, kstrtoul) + +#define EDAC_MEM_REPAIR_DO_OP(attrib, cb) \ +static ssize_t attrib##_store(struct device *ras_feat_dev, \ + struct device_attribute *attr, \ + const char *buf, size_t len) \ +{ \ + u8 inst = TO_MEM_REPAIR_DEV_ATTR(attr)->instance; \ + struct edac_dev_feat_ctx *ctx = dev_get_drvdata(ras_feat_dev); \ + const struct edac_mem_repair_ops *ops = ctx->mem_repair[inst].mem_repair_ops; \ + int ret; \ + \ + ret = ops->cb(ras_feat_dev->parent, ctx->mem_repair[inst].private); \ + if (ret) \ + return ret; \ + \ + return len; \ +} + +EDAC_MEM_REPAIR_DO_OP(query, do_query) +EDAC_MEM_REPAIR_DO_OP(repair, do_repair) + +static ssize_t persist_mode_avail_show(struct device *ras_feat_dev, + struct device_attribute *attr, char *buf) +{ + struct edac_dev_feat_ctx *ctx = dev_get_drvdata(ras_feat_dev); + u8 inst = TO_MEM_REPAIR_DEV_ATTR(attr)->instance; + const struct edac_mem_repair_ops *ops = ctx->mem_repair[inst].mem_repair_ops; + + return ops->get_persist_mode_avail(ras_feat_dev->parent, + ctx->mem_repair[inst].private, buf); +} + +static umode_t mem_repair_attr_visible(struct kobject *kobj, struct attribute *a, int attr_id) +{ + struct device *ras_feat_dev = kobj_to_dev(kobj); + struct device_attribute *dev_attr = container_of(a, struct device_attribute, attr); + struct edac_dev_feat_ctx *ctx = dev_get_drvdata(ras_feat_dev); + u8 inst = TO_MEM_REPAIR_DEV_ATTR(dev_attr)->instance; + const struct edac_mem_repair_ops *ops = ctx->mem_repair[inst].mem_repair_ops; + + switch (attr_id) { + case MEM_REPAIR_TYPE: + if (ops->get_repair_type) + return a->mode; + break; + case MEM_REPAIR_PERSIST_MODE_AVAIL: + if (ops->get_persist_mode_avail) + return a->mode; + break; + case MEM_REPAIR_PERSIST_MODE: + if (ops->get_persist_mode) { + if (ops->set_persist_mode) + return a->mode; + else + return 0444; + } + break; + case MEM_REPAIR_DPA_SUPPORT: + if (ops->get_dpa_support) + return a->mode; + break; + case MEM_REPAIR_SAFE_IN_USE: + if (ops->get_repair_safe_when_in_use) + return a->mode; + break; + case MEM_REPAIR_HPA: + if (ops->get_hpa) { + if (ops->set_hpa) + return a->mode; + else + return 0444; + } + break; + case MEM_REPAIR_DPA: + if (ops->get_dpa) { + if (ops->set_dpa) + return a->mode; + else + return 0444; + } + break; + case MEM_REPAIR_NIBBLE_MASK: + if (ops->get_nibble_mask) { + if (ops->set_nibble_mask) + return a->mode; + else + return 0444; + } + break; + case MEM_REPAIR_BANK_GROUP: + if (ops->get_bank_group) { + if (ops->set_bank_group) + return a->mode; + else + return 0444; + } + break; + case MEM_REPAIR_BANK: + if (ops->get_bank) { + if (ops->set_bank) + return a->mode; + else + return 0444; + } + break; + case MEM_REPAIR_RANK: + if (ops->get_rank) { + if (ops->set_rank) + return a->mode; + else + return 0444; + } + break; + case MEM_REPAIR_ROW: + if (ops->get_row) { + if (ops->set_row) + return a->mode; + else + return 0444; + } + break; + case MEM_REPAIR_COLUMN: + if (ops->get_column) { + if (ops->set_column) + return a->mode; + else + return 0444; + } + break; + case MEM_REPAIR_CHANNEL: + if (ops->get_channel) { + if (ops->set_channel) + return a->mode; + else + return 0444; + } + break; + case MEM_REPAIR_SUB_CHANNEL: + if (ops->get_sub_channel) { + if (ops->set_sub_channel) + return a->mode; + else + return 0444; + } + break; + case MEM_REPAIR_QUERY: + if (ops->do_query) + return a->mode; + break; + case MEM_DO_REPAIR: + if (ops->do_repair) + return a->mode; + break; + default: + break; + } + + return 0; +} + +#define EDAC_MEM_REPAIR_ATTR_RO(_name, _instance) \ + ((struct edac_mem_repair_dev_attr) { .dev_attr = __ATTR_RO(_name), \ + .instance = _instance }) + +#define EDAC_MEM_REPAIR_ATTR_WO(_name, _instance) \ + ((struct edac_mem_repair_dev_attr) { .dev_attr = __ATTR_WO(_name), \ + .instance = _instance }) + +#define EDAC_MEM_REPAIR_ATTR_RW(_name, _instance) \ + ((struct edac_mem_repair_dev_attr) { .dev_attr = __ATTR_RW(_name), \ + .instance = _instance }) + +static int mem_repair_create_desc(struct device *dev, + const struct attribute_group **attr_groups, + u8 instance) +{ + struct edac_mem_repair_context *ctx; + struct attribute_group *group; + int i; + struct edac_mem_repair_dev_attr dev_attr[] = { + [MEM_REPAIR_TYPE] = EDAC_MEM_REPAIR_ATTR_RO(repair_type, + instance), + [MEM_REPAIR_PERSIST_MODE_AVAIL] = + EDAC_MEM_REPAIR_ATTR_RO(persist_mode_avail, + instance), + [MEM_REPAIR_PERSIST_MODE] = + EDAC_MEM_REPAIR_ATTR_RW(persist_mode, instance), + [MEM_REPAIR_DPA_SUPPORT] = + EDAC_MEM_REPAIR_ATTR_RO(dpa_support, instance), + [MEM_REPAIR_SAFE_IN_USE] = + EDAC_MEM_REPAIR_ATTR_RO(repair_safe_when_in_use, + instance), + [MEM_REPAIR_HPA] = EDAC_MEM_REPAIR_ATTR_RW(hpa, instance), + [MEM_REPAIR_DPA] = EDAC_MEM_REPAIR_ATTR_RW(dpa, instance), + [MEM_REPAIR_NIBBLE_MASK] = + EDAC_MEM_REPAIR_ATTR_RW(nibble_mask, instance), + [MEM_REPAIR_BANK_GROUP] = + EDAC_MEM_REPAIR_ATTR_RW(bank_group, instance), + [MEM_REPAIR_BANK] = EDAC_MEM_REPAIR_ATTR_RW(bank, instance), + [MEM_REPAIR_RANK] = EDAC_MEM_REPAIR_ATTR_RW(rank, instance), + [MEM_REPAIR_ROW] = EDAC_MEM_REPAIR_ATTR_RW(row, instance), + [MEM_REPAIR_COLUMN] = EDAC_MEM_REPAIR_ATTR_RW(column, instance), + [MEM_REPAIR_CHANNEL] = EDAC_MEM_REPAIR_ATTR_RW(channel, instance), + [MEM_REPAIR_SUB_CHANNEL] = + EDAC_MEM_REPAIR_ATTR_RW(sub_channel, instance), + [MEM_REPAIR_QUERY] = EDAC_MEM_REPAIR_ATTR_WO(query, instance), + [MEM_DO_REPAIR] = EDAC_MEM_REPAIR_ATTR_WO(repair, instance) + }; + + ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL); + if (!ctx) + return -ENOMEM; + + for (i = 0; i < MEM_REPAIR_MAX_ATTRS; i++) { + memcpy(&ctx->mem_repair_dev_attr[i].dev_attr, + &dev_attr[i], sizeof(dev_attr[i])); + ctx->mem_repair_attrs[i] = + &ctx->mem_repair_dev_attr[i].dev_attr.attr; + } + + sprintf(ctx->name, "%s%d", "mem_repair", instance); + group = &ctx->group; + group->name = ctx->name; + group->attrs = ctx->mem_repair_attrs; + group->is_visible = mem_repair_attr_visible; + attr_groups[0] = group; + + return 0; +} + +/** + * edac_mem_repair_get_desc - get EDAC memory repair descriptors + * @dev: client device with memory repair feature + * @attr_groups: pointer to attribute group container + * @instance: device's memory repair instance number. + * + * Return: + * * %0 - Success. + * * %-EINVAL - Invalid parameters passed. + * * %-ENOMEM - Dynamic memory allocation failed. + */ +int edac_mem_repair_get_desc(struct device *dev, + const struct attribute_group **attr_groups, u8 instance) +{ + if (!dev || !attr_groups) + return -EINVAL; + + return mem_repair_create_desc(dev, attr_groups, instance); +} diff --git a/include/linux/edac.h b/include/linux/edac.h index 04385b1a9283..b52730d63088 100644 --- a/include/linux/edac.h +++ b/include/linux/edac.h @@ -670,6 +670,7 @@ static inline struct dimm_info *edac_get_dimm(struct mem_ctl_info *mci, enum edac_dev_feat { RAS_FEAT_SCRUB, RAS_FEAT_ECS, + RAS_FEAT_MEM_REPAIR, RAS_FEAT_MAX }; @@ -731,11 +732,95 @@ int edac_ecs_get_desc(struct device *ecs_dev, const struct attribute_group **attr_groups, u16 num_media_frus); +enum edac_mem_repair_type { + EDAC_TYPE_SPPR, + EDAC_TYPE_HPPR, + EDAC_TYPE_CACHELINE_MEM_SPARING, + EDAC_TYPE_ROW_MEM_SPARING, + EDAC_TYPE_BANK_MEM_SPARING, + EDAC_TYPE_RANK_MEM_SPARING, +}; + +enum edac_mem_repair_persist_mode { + EDAC_MEM_REPAIR_SOFT, /* soft memory repair */ + EDAC_MEM_REPAIR_HARD, /* hard memory repair */ +}; + +/** + * struct edac_mem_repair_ops - memory repair device operations + * (all elements optional) + * @get_repair_type: get the memory repair type, listed in enum edac_mem_repair_type. + * @get_persist_mode_avail: get the persist modes supported in the device. + * @get_persist_mode: get the persist mode of the memory repair instance. + * @set_persist_mode: set the persist mode for the memory repair instance. + * @get_dpa_support: get dpa support flag. + * @get_repair_safe_when_in_use: get whether memory media is accessible and + * data is retained during repair operation. + * @get_hpa: get HPA for memory repair. + * @set_hpa: set HPA for memory repair. + * @get_dpa: get DPA for memory repair. + * @set_dpa: set DPA for memory repair. + * @get_nibble_mask: get nibble mask for memory repair. + * @set_nibble_mask: set nibble mask for memory repair. + * @get_bank_group: get bank group for memory repair. + * @set_bank_group: set bank group for memory repair. + * @get_bank: get bank for memory repair. + * @set_bank: set bank for memory repair. + * @get_rank: get rank for memory repair. + * @set_rank: set rank for memory repair. + * @get_row: get row for memory repair. + * @set_row: set row for memory repair. + * @get_column: get column for memory repair. + * @set_column: set column for memory repair. + * @get_channel: get channel for memory repair. + * @set_channel: set channel for memory repair. + * @get_sub_channel: get sub channel for memory repair. + * @set_sub_channel: set sub channel for memory repair. + * @do_query: Query memory repair operation for the HPA/DPA/other attrs set + * is supported or not. + * @do_repair: start memory repair operation for the HPA/DPA/other attrs set. + */ +struct edac_mem_repair_ops { + int (*get_repair_type)(struct device *dev, void *drv_data, u32 *val); + int (*get_persist_mode_avail)(struct device *dev, void *drv_data, char *buf); + int (*get_persist_mode)(struct device *dev, void *drv_data, u32 *mode); + int (*set_persist_mode)(struct device *dev, void *drv_data, u32 mode); + int (*get_dpa_support)(struct device *dev, void *drv_data, u32 *val); + int (*get_repair_safe_when_in_use)(struct device *dev, void *drv_data, u32 *val); + int (*get_hpa)(struct device *dev, void *drv_data, u64 *hpa); + int (*set_hpa)(struct device *dev, void *drv_data, u64 hpa); + int (*get_dpa)(struct device *dev, void *drv_data, u64 *dpa); + int (*set_dpa)(struct device *dev, void *drv_data, u64 dpa); + int (*get_nibble_mask)(struct device *dev, void *drv_data, u64 *val); + int (*set_nibble_mask)(struct device *dev, void *drv_data, u64 val); + int (*get_bank_group)(struct device *dev, void *drv_data, u32 *val); + int (*set_bank_group)(struct device *dev, void *drv_data, u32 val); + int (*get_bank)(struct device *dev, void *drv_data, u32 *val); + int (*set_bank)(struct device *dev, void *drv_data, u32 val); + int (*get_rank)(struct device *dev, void *drv_data, u32 *val); + int (*set_rank)(struct device *dev, void *drv_data, u32 val); + int (*get_row)(struct device *dev, void *drv_data, u64 *val); + int (*set_row)(struct device *dev, void *drv_data, u64 val); + int (*get_column)(struct device *dev, void *drv_data, u32 *val); + int (*set_column)(struct device *dev, void *drv_data, u32 val); + int (*get_channel)(struct device *dev, void *drv_data, u32 *val); + int (*set_channel)(struct device *dev, void *drv_data, u32 val); + int (*get_sub_channel)(struct device *dev, void *drv_data, u32 *val); + int (*set_sub_channel)(struct device *dev, void *drv_data, u32 val); + int (*do_query)(struct device *dev, void *drv_data); + int (*do_repair)(struct device *dev, void *drv_data); +}; + +int edac_mem_repair_get_desc(struct device *dev, + const struct attribute_group **attr_groups, + u8 instance); + /* EDAC device feature information structure */ struct edac_dev_data { union { const struct edac_scrub_ops *scrub_ops; const struct edac_ecs_ops *ecs_ops; + const struct edac_mem_repair_ops *mem_repair_ops; }; u8 instance; void *private; @@ -746,6 +831,7 @@ struct edac_dev_feat_ctx { void *private; struct edac_dev_data *scrub; struct edac_dev_data ecs; + struct edac_dev_data *mem_repair; }; struct edac_dev_feature { @@ -754,6 +840,7 @@ struct edac_dev_feature { union { const struct edac_scrub_ops *scrub_ops; const struct edac_ecs_ops *ecs_ops; + const struct edac_mem_repair_ops *mem_repair_ops; }; void *ctx; struct edac_ecs_ex_info ecs_info; From patchwork Fri Nov 1 09:17:30 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Shiju Jose X-Patchwork-Id: 13858985 Received: from frasgout.his.huawei.com (frasgout.his.huawei.com [185.176.79.56]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 7606819E819; Fri, 1 Nov 2024 09:18:28 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; 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spf=pass smtp.mailfrom=huawei.com Received: from mail.maildlp.com (unknown [172.18.186.31]) by frasgout.his.huawei.com (SkyGuard) with ESMTP id 4XfwC04zF2z6L6fL; Fri, 1 Nov 2024 17:13:32 +0800 (CST) Received: from frapeml500007.china.huawei.com (unknown [7.182.85.172]) by mail.maildlp.com (Postfix) with ESMTPS id 7FEF6140445; Fri, 1 Nov 2024 17:18:26 +0800 (CST) Received: from P_UKIT01-A7bmah.china.huawei.com (10.126.171.129) by frapeml500007.china.huawei.com (7.182.85.172) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.1.2507.39; Fri, 1 Nov 2024 10:18:24 +0100 From: To: , , , , CC: , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , Subject: [PATCH v15 12/15] cxl/mbox: Add support for PERFORM_MAINTENANCE mailbox command Date: Fri, 1 Nov 2024 09:17:30 +0000 Message-ID: <20241101091735.1465-13-shiju.jose@huawei.com> X-Mailer: git-send-email 2.43.0.windows.1 In-Reply-To: <20241101091735.1465-1-shiju.jose@huawei.com> References: <20241101091735.1465-1-shiju.jose@huawei.com> Precedence: bulk X-Mailing-List: linux-acpi@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-ClientProxiedBy: lhrpeml500004.china.huawei.com (7.191.163.9) To frapeml500007.china.huawei.com (7.182.85.172) From: Shiju Jose Add support for PERFORM_MAINTENANCE mailbox command. CXL spec 3.1 section 8.2.9.7.1 describes the Perform Maintenance command. This command requests the device to execute the maintenance operation specified by the maintenance operation class and the maintenance operation subclass. Reviewed-by: Jonathan Cameron Signed-off-by: Shiju Jose --- drivers/cxl/core/mbox.c | 35 +++++++++++++++++++++++++++++++++++ drivers/cxl/cxlmem.h | 17 +++++++++++++++++ 2 files changed, 52 insertions(+) diff --git a/drivers/cxl/core/mbox.c b/drivers/cxl/core/mbox.c index 4b9e62de164b..381cf9d61c85 100644 --- a/drivers/cxl/core/mbox.c +++ b/drivers/cxl/core/mbox.c @@ -1084,6 +1084,41 @@ int cxl_set_feature(struct cxl_memdev_state *mds, } EXPORT_SYMBOL_NS_GPL(cxl_set_feature, CXL); +int cxl_do_maintenance(struct cxl_memdev_state *mds, + u8 class, u8 subclass, + void *data_in, size_t data_in_size) +{ + struct cxl_mailbox *cxl_mbox = &mds->cxlds.cxl_mbox; + struct cxl_memdev_maintenance_pi { + struct cxl_mbox_do_maintenance_hdr hdr; + u8 data[]; + } __packed; + struct cxl_mbox_cmd mbox_cmd; + size_t hdr_size; + + struct cxl_memdev_maintenance_pi *pi __free(kfree) = + kmalloc(cxl_mbox->payload_size, GFP_KERNEL); + pi->hdr.op_class = class; + pi->hdr.op_subclass = subclass; + hdr_size = sizeof(pi->hdr); + /* + * Check minimum mbox payload size is available for + * the maintenance data transfer. + */ + if (hdr_size + data_in_size > cxl_mbox->payload_size) + return -ENOMEM; + + memcpy(pi->data, data_in, data_in_size); + mbox_cmd = (struct cxl_mbox_cmd) { + .opcode = CXL_MBOX_OP_DO_MAINTENANCE, + .size_in = hdr_size + data_in_size, + .payload_in = pi, + }; + + return cxl_internal_send_cmd(cxl_mbox, &mbox_cmd); +} +EXPORT_SYMBOL_NS_GPL(cxl_do_maintenance, CXL); + /** * cxl_enumerate_cmds() - Enumerate commands for a device. * @mds: The driver data for the operation diff --git a/drivers/cxl/cxlmem.h b/drivers/cxl/cxlmem.h index 9259c5d70a65..28290f7c89f7 100644 --- a/drivers/cxl/cxlmem.h +++ b/drivers/cxl/cxlmem.h @@ -533,6 +533,7 @@ enum cxl_opcode { CXL_MBOX_OP_GET_SUPPORTED_FEATURES = 0x0500, CXL_MBOX_OP_GET_FEATURE = 0x0501, CXL_MBOX_OP_SET_FEATURE = 0x0502, + CXL_MBOX_OP_DO_MAINTENANCE = 0x0600, CXL_MBOX_OP_IDENTIFY = 0x4000, CXL_MBOX_OP_GET_PARTITION_INFO = 0x4100, CXL_MBOX_OP_SET_PARTITION_INFO = 0x4101, @@ -909,6 +910,19 @@ struct cxl_mbox_set_feat_hdr { u8 rsvd[9]; } __packed; +/* + * Perform Maintenance CXL 3.1 Spec 8.2.9.7.1 + */ + +/* + * Perform Maintenance input payload + * CXL rev 3.1 section 8.2.9.7.1 Table 8-102 + */ +struct cxl_mbox_do_maintenance_hdr { + u8 op_class; + u8 op_subclass; +} __packed; + int cxl_internal_send_cmd(struct cxl_mailbox *cxl_mbox, struct cxl_mbox_cmd *cmd); int cxl_dev_state_identify(struct cxl_memdev_state *mds); @@ -986,4 +1000,7 @@ int cxl_set_feature(struct cxl_memdev_state *mds, const uuid_t feat_uuid, u8 feat_version, void *feat_data, size_t feat_data_size, u8 feat_flag); +int cxl_do_maintenance(struct cxl_memdev_state *mds, + u8 class, u8 subclass, + void *data_in, size_t data_in_size); #endif /* __CXL_MEM_H__ */ From patchwork Fri Nov 1 09:17:31 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Shiju Jose X-Patchwork-Id: 13858986 Received: from frasgout.his.huawei.com (frasgout.his.huawei.com [185.176.79.56]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 2174119E826; 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dmarc=pass (p=quarantine dis=none) header.from=huawei.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=huawei.com Received: from mail.maildlp.com (unknown [172.18.186.216]) by frasgout.his.huawei.com (SkyGuard) with ESMTP id 4XfwFq1D54z6K7MW; Fri, 1 Nov 2024 17:15:59 +0800 (CST) Received: from frapeml500007.china.huawei.com (unknown [7.182.85.172]) by mail.maildlp.com (Postfix) with ESMTPS id 204DA1404FC; Fri, 1 Nov 2024 17:18:30 +0800 (CST) Received: from P_UKIT01-A7bmah.china.huawei.com (10.126.171.129) by frapeml500007.china.huawei.com (7.182.85.172) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.1.2507.39; Fri, 1 Nov 2024 10:18:27 +0100 From: To: , , , , CC: , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , Subject: [PATCH v15 13/15] cxl/memfeature: Add CXL memory device sPPR control feature Date: Fri, 1 Nov 2024 09:17:31 +0000 Message-ID: <20241101091735.1465-14-shiju.jose@huawei.com> X-Mailer: git-send-email 2.43.0.windows.1 In-Reply-To: <20241101091735.1465-1-shiju.jose@huawei.com> References: <20241101091735.1465-1-shiju.jose@huawei.com> Precedence: bulk X-Mailing-List: linux-acpi@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-ClientProxiedBy: lhrpeml500004.china.huawei.com (7.191.163.9) To frapeml500007.china.huawei.com (7.182.85.172) From: Shiju Jose Post Package Repair (PPR) maintenance operations may be supported by CXL devices that implement CXL.mem protocol. A PPR maintenance operation requests the CXL device to perform a repair operation on its media. For example, a CXL device with DRAM components that support PPR features may implement PPR Maintenance operations. DRAM components may support two types of PPR: Hard PPR (hPPR), for a permanent row repair, and Soft PPR (sPPR), for a temporary row repair. sPPR is much faster than hPPR, but the repair is lost with a power cycle. During the execution of a PPR Maintenance operation, a CXL memory device: - May or may not retain data - May or may not be able to process CXL.mem requests correctly, including the ones that target the DPA involved in the repair. These CXL Memory Device capabilities are specified by Restriction Flags in the sPPR Feature and hPPR Feature. sPPR maintenance operation may be executed at runtime, if data is retained and CXL.mem requests are correctly processed. For CXL devices with DRAM components, hPPR maintenance operation may be executed only at boot because data would not be retained. When a CXL device identifies a failure on a memory component, the device may inform the host about the need for a PPR maintenance operation by using an Event Record, where the Maintenance Needed flag is set. The Event Record specifies the DPA that should be repaired. A CXL device may not keep track of the requests that have already been sent and the information on which DPA should be repaired may be lost upon power cycle. The userspace tool requests for maintenance operation if the number of corrected error reported on a CXL.mem media exceeds error threshold. CXL spec 3.1 section 8.2.9.7.1.2 describes the device's sPPR (soft PPR) maintenance operation and section 8.2.9.7.1.3 describes the device's hPPR (hard PPR) maintenance operation feature. CXL spec 3.1 section 8.2.9.7.2.1 describes the sPPR feature discovery and configuration. CXL spec 3.1 section 8.2.9.7.2.2 describes the hPPR feature discovery and configuration. Add support for controlling CXL memory device sPPR feature. Register with EDAC driver, which gets the memory repair attr descriptors from the EDAC memory repair driver and exposes sysfs repair control attributes for PRR to the userspace. For example CXL PPR control for the CXL mem0 device is exposed in /sys/bus/edac/devices/cxl_mem0/mem_repairX/ Tested with QEMU patch for CXL PPR feature. https://lore.kernel.org/all/20240730045722.71482-1-dave@stgolabs.net/ Signed-off-by: Shiju Jose --- drivers/cxl/core/memfeature.c | 369 +++++++++++++++++++++++++++++++++- 1 file changed, 368 insertions(+), 1 deletion(-) diff --git a/drivers/cxl/core/memfeature.c b/drivers/cxl/core/memfeature.c index e641396a32f5..9238ad10766e 100644 --- a/drivers/cxl/core/memfeature.c +++ b/drivers/cxl/core/memfeature.c @@ -16,8 +16,9 @@ #include #include #include +#include "core.h" -#define CXL_DEV_NUM_RAS_FEATURES 2 +#define CXL_DEV_NUM_RAS_FEATURES 3 #define CXL_DEV_HOUR_IN_SECS 3600 #define CXL_SCRUB_NAME_LEN 128 @@ -606,17 +607,350 @@ static const struct edac_ecs_ops cxl_ecs_ops = { .set_threshold = cxl_ecs_set_threshold, }; +/* CXL memory soft PPR & hard PPR control definitions */ +/* See CXL rev 3.1 @8.2.9.7.2 Table 8-110 Maintenance Operation */ +static const uuid_t cxl_sppr_uuid = + UUID_INIT(0x892ba475, 0xfad8, 0x474e, 0x9d, 0x3e, 0x69, 0x2c, 0x91, 0x75, 0x68, 0xbb); + +static const uuid_t cxl_hppr_uuid = + UUID_INIT(0x80ea4521, 0x786f, 0x4127, 0xaf, 0xb1, 0xec, 0x74, 0x59, 0xfb, 0x0e, 0x24); + +struct cxl_ppr_context { + uuid_t repair_uuid; + u8 instance; + u16 get_feat_size; + u16 set_feat_size; + u8 get_version; + u8 set_version; + u16 set_effects; + struct cxl_memdev *cxlmd; + enum edac_mem_repair_type repair_type; + enum edac_mem_repair_persist_mode persist_mode; + u64 dpa; + u32 nibble_mask; +}; + +/** + * struct cxl_memdev_ppr_params - CXL memory PPR parameter data structure. + * @op_class: PPR operation class. + * @op_subclass: PPR operation subclass. + * @dpa_support: device physical address for PPR support. + * @media_accessible: memory media is accessible or not during PPR operation. + * @data_retained: data is retained or not during PPR operation. + * @dpa: device physical address. + */ +struct cxl_memdev_ppr_params { + u8 op_class; + u8 op_subclass; + bool dpa_support; + bool media_accessible; + bool data_retained; + u64 dpa; +}; + +enum cxl_ppr_param { + CXL_PPR_PARAM_DO_QUERY, + CXL_PPR_PARAM_DO_PPR, +}; + +/* See CXL rev 3.1 @8.2.9.7.2.1 Table 8-113 sPPR Feature Readable Attributes */ +/* See CXL rev 3.1 @8.2.9.7.2.2 Table 8-116 hPPR Feature Readable Attributes */ +#define CXL_MEMDEV_PPR_QUERY_RESOURCE_FLAG BIT(0) + +#define CXL_MEMDEV_PPR_DEVICE_INITIATED_MASK BIT(0) +#define CXL_MEMDEV_PPR_FLAG_DPA_SUPPORT_MASK BIT(0) +#define CXL_MEMDEV_PPR_FLAG_NIBBLE_SUPPORT_MASK BIT(1) +#define CXL_MEMDEV_PPR_FLAG_MEM_SPARING_EV_REC_SUPPORT_MASK BIT(2) + +#define CXL_MEMDEV_PPR_RESTRICTION_FLAG_MEDIA_ACCESSIBLE_MASK BIT(0) +#define CXL_MEMDEV_PPR_RESTRICTION_FLAG_DATA_RETAINED_MASK BIT(2) + +#define CXL_MEMDEV_PPR_SPARING_EV_REC_EN_MASK BIT(0) + +struct cxl_memdev_repair_rd_attrs_hdr { + u8 max_op_latency; + __le16 op_cap; + __le16 op_mode; + u8 op_class; + u8 op_subclass; + u8 rsvd[9]; +} __packed; + +struct cxl_memdev_ppr_rd_attrs { + struct cxl_memdev_repair_rd_attrs_hdr hdr; + u8 ppr_flags; + __le16 restriction_flags; + u8 ppr_op_mode; +} __packed; + +/* See CXL rev 3.1 @8.2.9.7.2.1 Table 8-114 sPPR Feature Writable Attributes */ +/* See CXL rev 3.1 @8.2.9.7.2.2 Table 8-117 hPPR Feature Writable Attributes */ +struct cxl_memdev_ppr_wr_attrs { + __le16 op_mode; + u8 ppr_op_mode; +} __packed; + +/* See CXL rev 3.1 @8.2.9.7.1.2 Table 8-103 sPPR Maintenance Input Payload */ +/* See CXL rev 3.1 @8.2.9.7.1.3 Table 8-104 hPPR Maintenance Input Payload */ +struct cxl_memdev_ppr_maintenance_attrs { + u8 flags; + __le64 dpa; + u8 nibble_mask[3]; +} __packed; + +static int cxl_mem_ppr_get_attrs(struct device *dev, + struct cxl_ppr_context *cxl_ppr_ctx, + struct cxl_memdev_ppr_params *params) +{ + struct cxl_memdev *cxlmd = cxl_ppr_ctx->cxlmd; + struct cxl_dev_state *cxlds = cxlmd->cxlds; + struct cxl_memdev_state *mds = to_cxl_memdev_state(cxlds); + size_t rd_data_size = sizeof(struct cxl_memdev_ppr_rd_attrs); + size_t data_size; + struct cxl_memdev_ppr_rd_attrs *rd_attrs __free(kfree) = + kmalloc(rd_data_size, GFP_KERNEL); + if (!rd_attrs) + return -ENOMEM; + + data_size = cxl_get_feature(mds, cxl_ppr_ctx->repair_uuid, + CXL_GET_FEAT_SEL_CURRENT_VALUE, + rd_attrs, rd_data_size); + if (!data_size) + return -EIO; + + params->op_class = rd_attrs->hdr.op_class; + params->op_subclass = rd_attrs->hdr.op_subclass; + params->dpa_support = FIELD_GET(CXL_MEMDEV_PPR_FLAG_DPA_SUPPORT_MASK, + rd_attrs->ppr_flags); + params->media_accessible = FIELD_GET(CXL_MEMDEV_PPR_RESTRICTION_FLAG_MEDIA_ACCESSIBLE_MASK, + rd_attrs->restriction_flags) ^ 1; + params->data_retained = FIELD_GET(CXL_MEMDEV_PPR_RESTRICTION_FLAG_DATA_RETAINED_MASK, + rd_attrs->restriction_flags) ^ 1; + + return 0; +} + +static int cxl_mem_do_ppr_op(struct device *dev, + struct cxl_ppr_context *cxl_ppr_ctx, + struct cxl_memdev_ppr_params *rd_params, + enum cxl_ppr_param param_type) +{ + struct cxl_memdev_ppr_maintenance_attrs maintenance_attrs; + struct cxl_memdev *cxlmd = cxl_ppr_ctx->cxlmd; + struct cxl_dev_state *cxlds = cxlmd->cxlds; + struct cxl_memdev_state *mds = to_cxl_memdev_state(cxlds); + int ret; + + if (!rd_params->media_accessible || !rd_params->data_retained) { + /* Check if DPA is mapped */ + if (cxl_dpa_to_region(cxlmd, cxl_ppr_ctx->dpa)) { + dev_err(dev, "CXL can't do PPR as DPA is mapped\n"); + return -EBUSY; + } + } + memset(&maintenance_attrs, 0, sizeof(maintenance_attrs)); + if (param_type == CXL_PPR_PARAM_DO_QUERY) + maintenance_attrs.flags = CXL_MEMDEV_PPR_QUERY_RESOURCE_FLAG; + else + maintenance_attrs.flags = 0; + maintenance_attrs.dpa = cxl_ppr_ctx->dpa; + *((u32 *)&maintenance_attrs.nibble_mask[0]) = cxl_ppr_ctx->nibble_mask; + ret = cxl_do_maintenance(mds, rd_params->op_class, rd_params->op_subclass, + &maintenance_attrs, sizeof(maintenance_attrs)); + if (ret) { + dev_err(dev, "CXL do PPR failed ret=%d\n", ret); + up_read(&cxl_region_rwsem); + cxl_ppr_ctx->nibble_mask = 0; + cxl_ppr_ctx->dpa = 0; + return ret; + } + + return 0; +} + +static int cxl_mem_ppr_set_attrs(struct device *dev, + struct cxl_ppr_context *cxl_ppr_ctx, + enum cxl_ppr_param param_type) +{ + struct cxl_memdev_ppr_params rd_params; + int ret; + + ret = cxl_mem_ppr_get_attrs(dev, cxl_ppr_ctx, &rd_params); + if (ret) { + dev_err(dev, "Get cxlmemdev PPR params failed ret=%d\n", + ret); + return ret; + } + + switch (param_type) { + case CXL_PPR_PARAM_DO_QUERY: + case CXL_PPR_PARAM_DO_PPR: + ret = down_read_interruptible(&cxl_region_rwsem); + if (ret) + return ret; + ret = down_read_interruptible(&cxl_dpa_rwsem); + if (ret) { + up_read(&cxl_region_rwsem); + return ret; + } + ret = cxl_mem_do_ppr_op(dev, cxl_ppr_ctx, &rd_params, param_type); + up_read(&cxl_dpa_rwsem); + up_read(&cxl_region_rwsem); + return ret; + default: + return -EINVAL; + } +} + +static int cxl_ppr_get_repair_type(struct device *dev, void *drv_data, + u32 *repair_type) +{ + struct cxl_ppr_context *cxl_ppr_ctx = drv_data; + + *repair_type = cxl_ppr_ctx->repair_type; + + return 0; +} + +static int cxl_ppr_get_persist_mode_avail(struct device *dev, void *drv_data, + char *buf) +{ + return sysfs_emit(buf, "%u\n", EDAC_MEM_REPAIR_SOFT); +} + +static int cxl_ppr_get_persist_mode(struct device *dev, void *drv_data, + u32 *persist_mode) +{ + struct cxl_ppr_context *cxl_ppr_ctx = drv_data; + + *persist_mode = cxl_ppr_ctx->persist_mode; + + return 0; +} + +static int cxl_ppr_get_dpa_support(struct device *dev, void *drv_data, + u32 *dpa_support) +{ + struct cxl_ppr_context *cxl_ppr_ctx = drv_data; + struct cxl_memdev_ppr_params params; + int ret; + + ret = cxl_mem_ppr_get_attrs(dev, cxl_ppr_ctx, ¶ms); + if (ret) + return ret; + + *dpa_support = params.dpa_support; + + return 0; +} + +static int cxl_get_ppr_safe_when_in_use(struct device *dev, void *drv_data, + u32 *safe) +{ + struct cxl_ppr_context *cxl_ppr_ctx = drv_data; + struct cxl_memdev_ppr_params params; + int ret; + + ret = cxl_mem_ppr_get_attrs(dev, cxl_ppr_ctx, ¶ms); + if (ret) + return ret; + + *safe = params.media_accessible & params.data_retained; + + return 0; +} + +static int cxl_get_ppr_dpa(struct device *dev, void *drv_data, + u64 *dpa) +{ + struct cxl_ppr_context *cxl_ppr_ctx = drv_data; + + *dpa = cxl_ppr_ctx->dpa; + + return 0; +} + +static int cxl_set_ppr_dpa(struct device *dev, void *drv_data, u64 dpa) +{ + struct cxl_ppr_context *cxl_ppr_ctx = drv_data; + + if (!dpa) + return -EINVAL; + + cxl_ppr_ctx->dpa = dpa; + + return 0; +} + +static int cxl_get_ppr_nibble_mask(struct device *dev, void *drv_data, + u64 *nibble_mask) +{ + struct cxl_ppr_context *cxl_ppr_ctx = drv_data; + + *nibble_mask = cxl_ppr_ctx->nibble_mask; + + return 0; +} + +static int cxl_set_ppr_nibble_mask(struct device *dev, void *drv_data, u64 nibble_mask) +{ + struct cxl_ppr_context *cxl_ppr_ctx = drv_data; + + cxl_ppr_ctx->nibble_mask = nibble_mask; + + return 0; +} + +static int cxl_do_query_ppr(struct device *dev, void *drv_data) +{ + struct cxl_ppr_context *cxl_ppr_ctx = drv_data; + + if (!cxl_ppr_ctx->dpa) + return -EINVAL; + + return cxl_mem_ppr_set_attrs(dev, cxl_ppr_ctx, CXL_PPR_PARAM_DO_QUERY); +} + +static int cxl_do_ppr(struct device *dev, void *drv_data) +{ + struct cxl_ppr_context *cxl_ppr_ctx = drv_data; + int ret; + + if (!cxl_ppr_ctx->dpa) + return -EINVAL; + + ret = cxl_mem_ppr_set_attrs(dev, cxl_ppr_ctx, CXL_PPR_PARAM_DO_PPR); + + return ret; +} + +static const struct edac_mem_repair_ops cxl_sppr_ops = { + .get_repair_type = cxl_ppr_get_repair_type, + .get_persist_mode_avail = cxl_ppr_get_persist_mode_avail, + .get_persist_mode = cxl_ppr_get_persist_mode, + .get_dpa_support = cxl_ppr_get_dpa_support, + .get_repair_safe_when_in_use = cxl_get_ppr_safe_when_in_use, + .get_dpa = cxl_get_ppr_dpa, + .set_dpa = cxl_set_ppr_dpa, + .get_nibble_mask = cxl_get_ppr_nibble_mask, + .set_nibble_mask = cxl_set_ppr_nibble_mask, + .do_query = cxl_do_query_ppr, + .do_repair = cxl_do_ppr, +}; + int cxl_mem_ras_features_init(struct cxl_memdev *cxlmd, struct cxl_region *cxlr) { struct edac_dev_feature ras_features[CXL_DEV_NUM_RAS_FEATURES]; struct cxl_patrol_scrub_context *cxl_ps_ctx; char cxl_dev_name[CXL_SCRUB_NAME_LEN]; + struct cxl_ppr_context *cxl_sppr_ctx; struct cxl_ecs_context *cxl_ecs_ctx; struct cxl_feat_entry feat_entry; struct cxl_memdev_state *mds; struct cxl_dev_state *cxlds; int num_ras_features = 0; int num_media_frus; + u8 repair_inst = 0; u8 scrub_inst = 0; int rc, i; @@ -714,6 +1048,39 @@ int cxl_mem_ras_features_init(struct cxl_memdev *cxlmd, struct cxl_region *cxlr) } feat_ecs_done: + /* CXL sPPR */ + rc = cxl_get_supported_feature_entry(mds, &cxl_sppr_uuid, + &feat_entry); + if (rc < 0) + goto feat_sppr_done; + + if (!(feat_entry.attr_flags & CXL_FEAT_ENTRY_FLAG_CHANGABLE)) + goto feat_sppr_done; + + cxl_sppr_ctx = devm_kzalloc(&cxlmd->dev, sizeof(*cxl_sppr_ctx), + GFP_KERNEL); + if (!cxl_sppr_ctx) + goto feat_sppr_done; + *cxl_sppr_ctx = (struct cxl_ppr_context) { + .repair_uuid = cxl_sppr_uuid, + .get_feat_size = feat_entry.get_feat_size, + .set_feat_size = feat_entry.set_feat_size, + .get_version = feat_entry.get_feat_ver, + .set_version = feat_entry.set_feat_ver, + .set_effects = feat_entry.set_effects, + .cxlmd = cxlmd, + .repair_type = EDAC_TYPE_SPPR, + .persist_mode = EDAC_MEM_REPAIR_SOFT, + .instance = repair_inst++, + }; + + ras_features[num_ras_features].ft_type = RAS_FEAT_MEM_REPAIR; + ras_features[num_ras_features].instance = cxl_sppr_ctx->instance; + ras_features[num_ras_features].mem_repair_ops = &cxl_sppr_ops; + ras_features[num_ras_features].ctx = cxl_sppr_ctx; + num_ras_features++; + +feat_sppr_done: return edac_dev_register(&cxlmd->dev, cxl_dev_name, NULL, num_ras_features, ras_features); } From patchwork Fri Nov 1 09:17:32 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Shiju Jose X-Patchwork-Id: 13858987 Received: from frasgout.his.huawei.com (frasgout.his.huawei.com [185.176.79.56]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 856761A01B0; Fri, 1 Nov 2024 09:18:35 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=185.176.79.56 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; 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Fri, 1 Nov 2024 17:16:02 +0800 (CST) Received: from frapeml500007.china.huawei.com (unknown [7.182.85.172]) by mail.maildlp.com (Postfix) with ESMTPS id 84B281404FC; Fri, 1 Nov 2024 17:18:33 +0800 (CST) Received: from P_UKIT01-A7bmah.china.huawei.com (10.126.171.129) by frapeml500007.china.huawei.com (7.182.85.172) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.1.2507.39; Fri, 1 Nov 2024 10:18:31 +0100 From: To: , , , , CC: , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , Subject: [PATCH v15 14/15] cxl/memfeature: Add CXL memory device memory sparing control feature Date: Fri, 1 Nov 2024 09:17:32 +0000 Message-ID: <20241101091735.1465-15-shiju.jose@huawei.com> X-Mailer: git-send-email 2.43.0.windows.1 In-Reply-To: <20241101091735.1465-1-shiju.jose@huawei.com> References: <20241101091735.1465-1-shiju.jose@huawei.com> Precedence: bulk X-Mailing-List: linux-acpi@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-ClientProxiedBy: lhrpeml500004.china.huawei.com (7.191.163.9) To frapeml500007.china.huawei.com (7.182.85.172) From: Shiju Jose Memory sparing is defined as a repair function that replaces a portion of memory with a portion of functional memory at that same DPA. The subclasses for this operation vary in terms of the scope of the sparing being performed. The cacheline sparing subclass refers to a sparing action that can replace a full cacheline. Row sparing is provided as an alternative to PPR sparing functions and its scope is that of a single DDR row. Bank sparing allows an entire bank to be replaced. Rank sparing is defined as an operation in which an entire DDR rank is replaced. Memory sparing maintenance operations may be supported by CXL devices that implement CXL.mem protocol. A sparing maintenance operation requests the CXL device to perform a repair operation on its media. For example, a CXL device with DRAM components that support memory sparing features may implement sparing maintenance operations. The host may issue a query command by setting query resources flag in the input payload (CXL spec 3.1 Table 8-105) to determine availability of sparing resources for a given address. In response to a query request, the device shall report the resource availability by producing the memory sparing event record (CXL spec 3.1 Table 8-48) in which the Channel, Rank, Nibble Mask, Bank Group, Bank, Row, Column, Sub-Channel fields are a copy of the values specified in the request. During the execution of a sparing maintenance operation, a CXL memory device: - May or may not retain data - May or may not be able to process CXL.mem requests correctly. These CXL memory device capabilities are specified by restriction flags in the memory sparing feature readable attributes. When a CXL device identifies a failure on a memory component, the device may inform the host about the need for a memory sparing maintenance operation by using an Event Record, where the maintenance needed flag may set. The event record specifies some of the DPA, Channel, Rank, Nibble Mask, Bank Group, Bank, Row, Column, Sub-Channel fields that should be repaired. The userspace tool requests for maintenance operation if the number of corrected error reported on a CXL.mem media exceeds error threshold. CXL spec 3.1 section 8.2.9.7.1.4 describes the device's memory sparing maintenance operation feature. CXL spec 3.1 section 8.2.9.7.2.3 describes the memory sparing feature discovery and configuration. Add support for controlling CXL memory device memory sparing feature. Register with EDAC driver, which gets the memory repair attr descriptors from the EDAC memory repair driver and exposes sysfs repair control attributes for memory sparing to the userspace. For example CXL memory sparing control for the CXL mem0 device is exposed in /sys/bus/edac/devices/cxl_mem0/mem_repairX/ Use case ======== 1. CXL device identifies a failure in a memory component, report to userspace in a CXL generic/DRAM trace event. 2. Rasdaemon process the trace event and issue query request in sysfs to check resources available for memory sparing if either of the following conditions met. - number of corrected error reported on a CXL.mem media exceeds error threshold - maintenance needed flag set in the event record. 3. CXL device shall report the resource availability by producing the memory sparing event record in which the channel, rank, nibble mask, bank Group, bank, row, column, sub-channel fields are a copy of the values specified in the request. The query resource command shall return error (invalid input) if the controller does not support reporting resource is available. 4. Rasdaemon process the memory sparing trace event and issue repair request for memory sparing. Kernel CXL driver shall report memory sparing event record to the userspace with the resource availability in order rasdaemon to process the event record and issue a repair request in sysfs for the memory sparing operation in the CXL device. Tested for memory sparing control feature with "hw/cxl: Add memory sparing control feature" Repository: "https://gitlab.com/shiju.jose/qemu.git" Branch: cxl-ras-features-2024-10-24 Signed-off-by: Shiju Jose --- drivers/cxl/core/memfeature.c | 485 +++++++++++++++++++++++++++++++++- 1 file changed, 484 insertions(+), 1 deletion(-) diff --git a/drivers/cxl/core/memfeature.c b/drivers/cxl/core/memfeature.c index 9238ad10766e..071c9e1c17df 100644 --- a/drivers/cxl/core/memfeature.c +++ b/drivers/cxl/core/memfeature.c @@ -18,7 +18,7 @@ #include #include "core.h" -#define CXL_DEV_NUM_RAS_FEATURES 3 +#define CXL_DEV_NUM_RAS_FEATURES 7 #define CXL_DEV_HOUR_IN_SECS 3600 #define CXL_SCRUB_NAME_LEN 128 @@ -938,9 +938,454 @@ static const struct edac_mem_repair_ops cxl_sppr_ops = { .do_repair = cxl_do_ppr, }; +/* CXL memory sparing control definitions */ +/* See CXL rev 3.1 @8.2.9.7.2 Table 8-110 Maintenance Operation */ +#define CXL_CACHELINE_SPARING_UUID UUID_INIT(0x96C33386, 0x91dd, 0x44c7, 0x9e, 0xcb, \ + 0xfd, 0xaf, 0x65, 0x03, 0xba, 0xc4) +#define CXL_ROW_SPARING_UUID UUID_INIT(0x450ebf67, 0xb135, 0x4f97, 0xa4, 0x98, \ + 0xc2, 0xd5, 0x7f, 0x27, 0x9b, 0xed) +#define CXL_BANK_SPARING_UUID UUID_INIT(0x78b79636, 0x90ac, 0x4b64, 0xa4, 0xef, \ + 0xfa, 0xac, 0x5d, 0x18, 0xa8, 0x63) +#define CXL_RANK_SPARING_UUID UUID_INIT(0x34dbaff5, 0x0552, 0x4281, 0x8f, 0x76, \ + 0xda, 0x0b, 0x5e, 0x7a, 0x76, 0xa7) + +enum cxl_mem_sparing_granularity { + CXL_MEM_SPARING_CACHELINE, + CXL_MEM_SPARING_ROW, + CXL_MEM_SPARING_BANK, + CXL_MEM_SPARING_RANK, + CXL_MEM_SPARING_MAX +}; + +struct cxl_mem_sparing_context { + uuid_t repair_uuid; + u8 instance; + u16 get_feat_size; + u16 set_feat_size; + u8 get_version; + u8 set_version; + u16 set_effects; + struct cxl_memdev *cxlmd; + enum edac_mem_repair_type repair_type; + enum edac_mem_repair_persist_mode persist_mode; + enum cxl_mem_sparing_granularity granularity; + bool dpa_support; + u64 dpa; + u8 channel; + u8 rank; + u32 nibble_mask; + u8 bank_group; + u8 bank; + u32 row; + u16 column; + u8 sub_channel; +}; + +struct cxl_memdev_sparing_params { + u8 op_class; + u8 op_subclass; + bool cap_safe_when_in_use; + bool cap_hard_sparing; + bool cap_soft_sparing; +}; + +enum cxl_mem_sparing_param_type { + CXL_MEM_SPARING_PARAM_DO_QUERY, + CXL_MEM_SPARING_PARAM_DO_REPAIR, +}; + +#define CXL_MEMDEV_SPARING_RD_CAP_SAFE_IN_USE_MASK BIT(0) +#define CXL_MEMDEV_SPARING_RD_CAP_HARD_SPARING_MASK BIT(1) +#define CXL_MEMDEV_SPARING_RD_CAP_SOFT_SPARING_MASK BIT(2) + +#define CXL_MEMDEV_SPARING_WR_DEVICE_INITIATED_MASK BIT(0) + +#define CXL_MEMDEV_SPARING_QUERY_RESOURCE_FLAG BIT(0) +#define CXL_MEMDEV_SET_HARD_SPARING_FLAG BIT(1) +#define CXL_MEMDEV_SPARING_SUB_CHANNEL_VALID_FLAG BIT(2) +#define CXL_MEMDEV_SPARING_NIB_MASK_VALID_FLAG BIT(3) + +/* See CXL rev 3.1 @8.2.9.7.2.3 Table 8-119 Memory Sparing Feature Readable Attributes */ +struct cxl_memdev_sparing_rd_attrs { + struct cxl_memdev_repair_rd_attrs_hdr hdr; + u8 rsvd; + __le16 restriction_flags; +} __packed; + +/* See CXL rev 3.1 @8.2.9.7.2.3 Table 8-120 Memory Sparing Feature Writable Attributes */ +struct cxl_memdev_sparing_wr_attrs { + __le16 op_mode; +} __packed; + +/* See CXL rev 3.1 @8.2.9.7.1.4 Table 8-105 Memory Sparing Input Payload */ +struct cxl_memdev_sparing_in_payload { + u8 flags; + u8 channel; + u8 rank; + u8 nibble_mask[3]; + u8 bank_group; + u8 bank; + u8 row[3]; + u16 column; + u8 sub_channel; +} __packed; + +static int cxl_mem_sparing_get_attrs(struct device *dev, + struct cxl_mem_sparing_context *cxl_sparing_ctx, + struct cxl_memdev_sparing_params *params) +{ + struct cxl_memdev *cxlmd = cxl_sparing_ctx->cxlmd; + struct cxl_dev_state *cxlds = cxlmd->cxlds; + struct cxl_memdev_state *mds = to_cxl_memdev_state(cxlds); + size_t rd_data_size = sizeof(struct cxl_memdev_sparing_rd_attrs); + size_t data_size; + struct cxl_memdev_sparing_rd_attrs *rd_attrs __free(kfree) = + kmalloc(rd_data_size, GFP_KERNEL); + if (!rd_attrs) + return -ENOMEM; + + data_size = cxl_get_feature(mds, cxl_sparing_ctx->repair_uuid, + CXL_GET_FEAT_SEL_CURRENT_VALUE, + rd_attrs, rd_data_size); + if (!data_size) + return -EIO; + + params->op_class = rd_attrs->hdr.op_class; + params->op_subclass = rd_attrs->hdr.op_subclass; + params->cap_safe_when_in_use = FIELD_GET(CXL_MEMDEV_SPARING_RD_CAP_SAFE_IN_USE_MASK, + rd_attrs->restriction_flags) ^ 1; + params->cap_hard_sparing = FIELD_GET(CXL_MEMDEV_SPARING_RD_CAP_HARD_SPARING_MASK, + rd_attrs->restriction_flags); + params->cap_soft_sparing = FIELD_GET(CXL_MEMDEV_SPARING_RD_CAP_SOFT_SPARING_MASK, + rd_attrs->restriction_flags); + + return 0; +} + +static int cxl_mem_do_sparing_op(struct device *dev, + struct cxl_mem_sparing_context *cxl_sparing_ctx, + struct cxl_memdev_sparing_params *rd_params, + enum cxl_mem_sparing_param_type param_type) +{ + struct cxl_memdev_sparing_in_payload sparing_pi; + struct cxl_memdev *cxlmd = cxl_sparing_ctx->cxlmd; + struct cxl_dev_state *cxlds = cxlmd->cxlds; + struct cxl_memdev_state *mds = to_cxl_memdev_state(cxlds); + int ret; + + if (!rd_params->cap_safe_when_in_use && cxl_sparing_ctx->dpa) { + /* Check if DPA is mapped */ + if (cxl_dpa_to_region(cxlmd, cxl_sparing_ctx->dpa)) { + dev_err(dev, "CXL can't do sparing as DPA is mapped\n"); + return -EBUSY; + } + } + memset(&sparing_pi, 0, sizeof(sparing_pi)); + if (param_type == CXL_MEM_SPARING_PARAM_DO_QUERY) { + sparing_pi.flags = CXL_MEMDEV_SPARING_QUERY_RESOURCE_FLAG; + } else { + sparing_pi.flags = + FIELD_PREP(CXL_MEMDEV_SPARING_QUERY_RESOURCE_FLAG, 0); + /* Do need set hard sparing, sub-channel & nb mask flags for query? */ + if (cxl_sparing_ctx->persist_mode == EDAC_MEM_REPAIR_HARD) + sparing_pi.flags |= + FIELD_PREP(CXL_MEMDEV_SET_HARD_SPARING_FLAG, 1); + if (cxl_sparing_ctx->sub_channel) + sparing_pi.flags |= + FIELD_PREP(CXL_MEMDEV_SPARING_SUB_CHANNEL_VALID_FLAG, 1); + if (cxl_sparing_ctx->nibble_mask) + sparing_pi.flags |= + FIELD_PREP(CXL_MEMDEV_SPARING_NIB_MASK_VALID_FLAG, 1); + } + /* Common atts for all memory sparing types */ + sparing_pi.channel = cxl_sparing_ctx->channel; + sparing_pi.rank = cxl_sparing_ctx->rank; + *((u32 *)&sparing_pi.nibble_mask[0]) = cxl_sparing_ctx->nibble_mask; + + if (cxl_sparing_ctx->repair_type == EDAC_TYPE_CACHELINE_MEM_SPARING || + cxl_sparing_ctx->repair_type == EDAC_TYPE_ROW_MEM_SPARING || + cxl_sparing_ctx->repair_type == EDAC_TYPE_BANK_MEM_SPARING) { + sparing_pi.bank_group = cxl_sparing_ctx->bank_group; + sparing_pi.bank = cxl_sparing_ctx->bank; + } + if (cxl_sparing_ctx->repair_type == EDAC_TYPE_CACHELINE_MEM_SPARING || + cxl_sparing_ctx->repair_type == EDAC_TYPE_ROW_MEM_SPARING) + *((u32 *)&sparing_pi.row[0]) = cxl_sparing_ctx->row; + if (cxl_sparing_ctx->repair_type == EDAC_TYPE_CACHELINE_MEM_SPARING) { + sparing_pi.column = cxl_sparing_ctx->column; + sparing_pi.sub_channel = cxl_sparing_ctx->sub_channel; + } + + ret = cxl_do_maintenance(mds, rd_params->op_class, rd_params->op_subclass, + &sparing_pi, sizeof(sparing_pi)); + if (ret) { + dev_err(dev, "CXL do mem sparing failed ret=%d\n", ret); + cxl_sparing_ctx->dpa = 0; + cxl_sparing_ctx->nibble_mask = 0; + cxl_sparing_ctx->bank_group = 0; + cxl_sparing_ctx->bank = 0; + cxl_sparing_ctx->rank = 0; + cxl_sparing_ctx->row = 0; + cxl_sparing_ctx->column = 0; + cxl_sparing_ctx->channel = 0; + cxl_sparing_ctx->sub_channel = 0; + return ret; + } + + return 0; +} + +static int cxl_mem_sparing_set_attrs(struct device *dev, + struct cxl_mem_sparing_context *ctx, + enum cxl_mem_sparing_param_type param_type) +{ + struct cxl_memdev_sparing_params rd_params; + int ret; + + ret = cxl_mem_sparing_get_attrs(dev, ctx, &rd_params); + if (ret) { + dev_err(dev, "Get cxlmemdev sparing params failed ret=%d\n", + ret); + return ret; + } + + switch (param_type) { + case CXL_MEM_SPARING_PARAM_DO_QUERY: + case CXL_MEM_SPARING_PARAM_DO_REPAIR: + ret = down_read_interruptible(&cxl_region_rwsem); + if (ret) + return ret; + ret = down_read_interruptible(&cxl_dpa_rwsem); + if (ret) { + up_read(&cxl_region_rwsem); + return ret; + } + ret = cxl_mem_do_sparing_op(dev, ctx, &rd_params, param_type); + up_read(&cxl_dpa_rwsem); + up_read(&cxl_region_rwsem); + return ret; + default: + return -EINVAL; + } +} + +#define CXL_SPARING_GET_ATTR(attrib, data_type) \ +static int cxl_mem_sparing_get_##attrib(struct device *dev, void *drv_data, \ + data_type *val) \ +{ \ + struct cxl_mem_sparing_context *ctx = drv_data; \ + \ + *val = ctx->attrib; \ + \ + return 0; \ +} +CXL_SPARING_GET_ATTR(repair_type, u32) +CXL_SPARING_GET_ATTR(persist_mode, u32) +CXL_SPARING_GET_ATTR(dpa_support, u32) +CXL_SPARING_GET_ATTR(dpa, u64) +CXL_SPARING_GET_ATTR(nibble_mask, u64) +CXL_SPARING_GET_ATTR(bank_group, u32) +CXL_SPARING_GET_ATTR(bank, u32) +CXL_SPARING_GET_ATTR(rank, u32) +CXL_SPARING_GET_ATTR(row, u64) +CXL_SPARING_GET_ATTR(column, u32) +CXL_SPARING_GET_ATTR(channel, u32) +CXL_SPARING_GET_ATTR(sub_channel, u32) + +#define CXL_SPARING_SET_ATTR(attrib, data_type) \ +static int cxl_mem_sparing_set_##attrib(struct device *dev, void *drv_data, \ + data_type val) \ +{ \ + struct cxl_mem_sparing_context *ctx = drv_data; \ + \ + ctx->attrib = val; \ + \ + return 0; \ +} +CXL_SPARING_SET_ATTR(nibble_mask, u64) +CXL_SPARING_SET_ATTR(bank_group, u32) +CXL_SPARING_SET_ATTR(bank, u32) +CXL_SPARING_SET_ATTR(rank, u32) +CXL_SPARING_SET_ATTR(row, u64) +CXL_SPARING_SET_ATTR(column, u32) +CXL_SPARING_SET_ATTR(channel, u32) +CXL_SPARING_SET_ATTR(sub_channel, u32) + +static int cxl_mem_sparing_get_persist_mode_avail(struct device *dev, void *drv_data, + char *buf) +{ + struct cxl_mem_sparing_context *ctx = drv_data; + struct cxl_memdev_sparing_params params; + int ret; + + ret = cxl_mem_sparing_get_attrs(dev, ctx, ¶ms); + if (ret) + return ret; + + if (params.cap_soft_sparing && params.cap_hard_sparing) + return sysfs_emit(buf, "%u,%u\n", EDAC_MEM_REPAIR_SOFT, EDAC_MEM_REPAIR_HARD); + else if (params.cap_soft_sparing) + return sysfs_emit(buf, "%u\n", EDAC_MEM_REPAIR_SOFT); + else if (params.cap_hard_sparing) + return sysfs_emit(buf, "%u\n", EDAC_MEM_REPAIR_HARD); + else + return sysfs_emit(buf, "Not Supported\n"); +} + +static int cxl_mem_sparing_set_persist_mode(struct device *dev, void *drv_data, u32 persist_mode) +{ + struct cxl_mem_sparing_context *ctx = drv_data; + + switch (persist_mode) { + case EDAC_MEM_REPAIR_SOFT: + ctx->persist_mode = EDAC_MEM_REPAIR_SOFT; + return 0; + case EDAC_MEM_REPAIR_HARD: + ctx->persist_mode = EDAC_MEM_REPAIR_HARD; + return 0; + default: + return -EINVAL; + } +} + +static int cxl_get_mem_sparing_safe_when_in_use(struct device *dev, void *drv_data, + u32 *safe) +{ + struct cxl_mem_sparing_context *ctx = drv_data; + struct cxl_memdev_sparing_params params; + int ret; + + ret = cxl_mem_sparing_get_attrs(dev, ctx, ¶ms); + if (ret) + return ret; + + *safe = params.cap_safe_when_in_use; + + return 0; +} + +static int cxl_mem_sparing_set_dpa(struct device *dev, void *drv_data, u64 dpa) +{ + struct cxl_mem_sparing_context *ctx = drv_data; + + if (!dpa) + return -EINVAL; + + ctx->dpa = dpa; + + return 0; +} + +static int cxl_do_query_mem_sparing(struct device *dev, void *drv_data) +{ + struct cxl_mem_sparing_context *ctx = drv_data; + + return cxl_mem_sparing_set_attrs(dev, ctx, CXL_MEM_SPARING_PARAM_DO_QUERY); +} + +static int cxl_do_mem_sparing(struct device *dev, void *drv_data) +{ + struct cxl_mem_sparing_context *ctx = drv_data; + + return cxl_mem_sparing_set_attrs(dev, ctx, CXL_MEM_SPARING_PARAM_DO_REPAIR); +} + +#define RANK_OPS \ + .get_repair_type = cxl_mem_sparing_get_repair_type, \ + .get_persist_mode_avail = cxl_mem_sparing_get_persist_mode_avail, \ + .get_persist_mode = cxl_mem_sparing_get_persist_mode, \ + .set_persist_mode = cxl_mem_sparing_set_persist_mode, \ + .get_repair_safe_when_in_use = cxl_get_mem_sparing_safe_when_in_use, \ + .get_dpa_support = cxl_mem_sparing_get_dpa_support, \ + .get_dpa = cxl_mem_sparing_get_dpa, \ + .set_dpa = cxl_mem_sparing_set_dpa, \ + .get_nibble_mask = cxl_mem_sparing_get_nibble_mask, \ + .set_nibble_mask = cxl_mem_sparing_set_nibble_mask, \ + .get_rank = cxl_mem_sparing_get_rank, \ + .set_rank = cxl_mem_sparing_set_rank, \ + .get_channel = cxl_mem_sparing_get_channel, \ + .set_channel = cxl_mem_sparing_set_channel, \ + .do_query = cxl_do_query_mem_sparing, \ + .do_repair = cxl_do_mem_sparing + +#define BANK_OPS \ + RANK_OPS, \ + .get_bank_group = cxl_mem_sparing_get_bank_group, \ + .set_bank_group = cxl_mem_sparing_set_bank_group, \ + .get_bank = cxl_mem_sparing_get_bank, \ + .set_bank = cxl_mem_sparing_set_bank + +#define ROW_OPS \ + BANK_OPS, \ + .get_row = cxl_mem_sparing_get_row, \ + .set_row = cxl_mem_sparing_set_row + +#define CACHELINE_OPS \ + ROW_OPS, \ + .get_column = cxl_mem_sparing_get_column, \ + .set_column = cxl_mem_sparing_set_column, \ + .get_sub_channel = cxl_mem_sparing_get_sub_channel, \ + .set_sub_channel = cxl_mem_sparing_set_sub_channel + +static const struct edac_mem_repair_ops cxl_rank_sparing_ops = { + RANK_OPS, +}; + +static const struct edac_mem_repair_ops cxl_bank_sparing_ops = { + BANK_OPS, +}; + +static const struct edac_mem_repair_ops cxl_row_sparing_ops = { + ROW_OPS, +}; + +static const struct edac_mem_repair_ops cxl_cacheline_sparing_ops = { + CACHELINE_OPS, +}; + +struct cxl_mem_sparing_desc { + const uuid_t repair_uuid; + enum edac_mem_repair_type repair_type; + enum edac_mem_repair_persist_mode persist_mode; + enum cxl_mem_sparing_granularity granularity; + const struct edac_mem_repair_ops *repair_ops; +}; + +static const struct cxl_mem_sparing_desc mem_sparing_desc[] = { + { + .repair_uuid = CXL_CACHELINE_SPARING_UUID, + .repair_type = EDAC_TYPE_CACHELINE_MEM_SPARING, + .persist_mode = EDAC_MEM_REPAIR_SOFT, + .granularity = CXL_MEM_SPARING_CACHELINE, + .repair_ops = &cxl_cacheline_sparing_ops, + }, + { + .repair_uuid = CXL_ROW_SPARING_UUID, + .repair_type = EDAC_TYPE_ROW_MEM_SPARING, + .persist_mode = EDAC_MEM_REPAIR_SOFT, + .granularity = CXL_MEM_SPARING_ROW, + .repair_ops = &cxl_row_sparing_ops, + }, + { + .repair_uuid = CXL_BANK_SPARING_UUID, + .repair_type = EDAC_TYPE_BANK_MEM_SPARING, + .persist_mode = EDAC_MEM_REPAIR_SOFT, + .granularity = CXL_MEM_SPARING_BANK, + .repair_ops = &cxl_bank_sparing_ops, + }, + { + .repair_uuid = CXL_RANK_SPARING_UUID, + .repair_type = EDAC_TYPE_RANK_MEM_SPARING, + .persist_mode = EDAC_MEM_REPAIR_SOFT, + .granularity = CXL_MEM_SPARING_RANK, + .repair_ops = &cxl_rank_sparing_ops, + }, +}; + int cxl_mem_ras_features_init(struct cxl_memdev *cxlmd, struct cxl_region *cxlr) { struct edac_dev_feature ras_features[CXL_DEV_NUM_RAS_FEATURES]; + struct cxl_mem_sparing_context *cxl_sparing_ctx; struct cxl_patrol_scrub_context *cxl_ps_ctx; char cxl_dev_name[CXL_SCRUB_NAME_LEN]; struct cxl_ppr_context *cxl_sppr_ctx; @@ -1081,6 +1526,44 @@ int cxl_mem_ras_features_init(struct cxl_memdev *cxlmd, struct cxl_region *cxlr) num_ras_features++; feat_sppr_done: + /* CXL memory sparing */ + for (i = 0; i < CXL_MEM_SPARING_MAX; i++) { + rc = cxl_get_supported_feature_entry(mds, &mem_sparing_desc[i].repair_uuid, + &feat_entry); + if (rc < 0) + continue; + + if (!(feat_entry.attr_flags & CXL_FEAT_ENTRY_FLAG_CHANGABLE)) + continue; + + cxl_sparing_ctx = devm_kzalloc(&cxlmd->dev, sizeof(*cxl_sparing_ctx), + GFP_KERNEL); + if (!cxl_sparing_ctx) + goto feat_sparing_done; + + *cxl_sparing_ctx = (struct cxl_mem_sparing_context) { + .repair_uuid = mem_sparing_desc[i].repair_uuid, + .get_feat_size = feat_entry.get_feat_size, + .set_feat_size = feat_entry.set_feat_size, + .get_version = feat_entry.get_feat_ver, + .set_version = feat_entry.set_feat_ver, + .set_effects = feat_entry.set_effects, + .cxlmd = cxlmd, + .repair_type = mem_sparing_desc[i].repair_type, + .persist_mode = mem_sparing_desc[i].persist_mode, + .granularity = mem_sparing_desc[i].granularity, + .dpa_support = true, + .instance = repair_inst++, + }; + ras_features[num_ras_features].ft_type = RAS_FEAT_MEM_REPAIR; + ras_features[num_ras_features].instance = cxl_sparing_ctx->instance; + ras_features[num_ras_features].mem_repair_ops = + mem_sparing_desc[i].repair_ops; + ras_features[num_ras_features].ctx = cxl_sparing_ctx; + num_ras_features++; + } + +feat_sparing_done: return edac_dev_register(&cxlmd->dev, cxl_dev_name, NULL, num_ras_features, ras_features); } From patchwork Fri Nov 1 09:17:33 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Shiju Jose X-Patchwork-Id: 13858988 Received: from frasgout.his.huawei.com (frasgout.his.huawei.com [185.176.79.56]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id AB1E319F437; Fri, 1 Nov 2024 09:18:38 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=185.176.79.56 ARC-Seal: i=1; a=rsa-sha256; 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spf=pass smtp.mailfrom=huawei.com Received: from mail.maildlp.com (unknown [172.18.186.231]) by frasgout.his.huawei.com (SkyGuard) with ESMTP id 4XfwFx6jqsz6K7MW; Fri, 1 Nov 2024 17:16:05 +0800 (CST) Received: from frapeml500007.china.huawei.com (unknown [7.182.85.172]) by mail.maildlp.com (Postfix) with ESMTPS id D669114058E; Fri, 1 Nov 2024 17:18:36 +0800 (CST) Received: from P_UKIT01-A7bmah.china.huawei.com (10.126.171.129) by frapeml500007.china.huawei.com (7.182.85.172) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.1.2507.39; Fri, 1 Nov 2024 10:18:34 +0100 From: To: , , , , CC: , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , Subject: [PATCH v15 15/15] EDAC: Add documentation for RAS feature control Date: Fri, 1 Nov 2024 09:17:33 +0000 Message-ID: <20241101091735.1465-16-shiju.jose@huawei.com> X-Mailer: git-send-email 2.43.0.windows.1 In-Reply-To: <20241101091735.1465-1-shiju.jose@huawei.com> References: <20241101091735.1465-1-shiju.jose@huawei.com> Precedence: bulk X-Mailing-List: linux-acpi@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-ClientProxiedBy: lhrpeml500004.china.huawei.com (7.191.163.9) To frapeml500007.china.huawei.com (7.182.85.172) From: Shiju Jose Add Documentation for expansion of EDAC for controlling RAS features. Signed-off-by: Shiju Jose --- Documentation/edac/features.rst | 102 +++++++ Documentation/edac/index.rst | 12 + Documentation/edac/memory_repair.rst | 230 ++++++++++++++++ Documentation/edac/scrub.rst | 393 +++++++++++++++++++++++++++ 4 files changed, 737 insertions(+) create mode 100644 Documentation/edac/features.rst create mode 100644 Documentation/edac/index.rst create mode 100644 Documentation/edac/memory_repair.rst create mode 100644 Documentation/edac/scrub.rst diff --git a/Documentation/edac/features.rst b/Documentation/edac/features.rst new file mode 100644 index 000000000000..5e855952136b --- /dev/null +++ b/Documentation/edac/features.rst @@ -0,0 +1,102 @@ +.. SPDX-License-Identifier: GPL-2.0 + +============================================ +Augmenting EDAC for controlling RAS features +============================================ + +Copyright (c) 2024 HiSilicon Limited. + +:Author: Shiju Jose +:License: The GNU Free Documentation License, Version 1.2 + (dual licensed under the GPL v2) +:Original Reviewers: + +- Written for: 6.13 + +Introduction +------------ +The expansion of EDAC for controlling RAS features and exposing features +control attributes to userspace via sysfs. Some Examples: + +* Scrub control + +* Error Check Scrub (ECS) control + +* ACPI RAS2 features + +* Post Package Repair (PPR) control + +* Memory Sparing Repair control etc. + +High level design is illustrated in the following diagram:: + + _______________________________________________ + | Userspace - Rasdaemon | + | _____________ | + | | RAS CXL mem | _______________ | + | |error handler|---->| | | + | |_____________| | RAS dynamic | | + | _____________ | scrub, memory | | + | | RAS memory |---->| repair control| | + | |error handler| |_______________| | + | |_____________| | | + |__________________________|____________________| + | + | + _______________________________|______________________________ + | Kernel EDAC extension for | controlling RAS Features | + | ______________________________|____________________________ | + || EDAC Core Sysfs EDAC| Bus | | + || __________________________|_________ _____________ | | + || |/sys/bus/edac/devices//scrubX/ | | EDAC device || | + || |/sys/bus/edac/devices//ecsX/ |<->| EDAC MC || | + || |/sys/bus/edac/devices//repairX | | EDAC sysfs || | + || |____________________________________| |_____________|| | + || EDAC|Bus | | + || | | | + || __________ Get feature | Get feature | | + || | |desc _________|______ desc __________ | | + || |EDAC scrub|<-----| EDAC device | | | | | + || |__________| | driver- RAS |---->| EDAC mem | | | + || __________ | feature control| | repair | | | + || | |<-----|________________| |__________| | | + || |EDAC ECS | Register RAS|features | | + || |__________| | | | + || ______________________|_____________ | | + ||_________|_______________|__________________|______________| | + | _______|____ _______|_______ ____|__________ | + | | | | CXL mem driver| | Client driver | | + | | ACPI RAS2 | | scrub, ECS, | | memory repair | | + | | driver | | sparing, PPR | | features | | + | |____________| |_______________| |_______________| | + | | | | | + |________|_________________|____________________|______________| + | | | + ________|_________________|____________________|______________ + | ___|_________________|____________________|_______ | + | | | | + | | Platform HW and Firmware | | + | |__________________________________________________| | + |______________________________________________________________| + + +1. EDAC Features components - Create feature specific descriptors. +For example, EDAC scrub, EDAC ECS, EDAC memory repair in the above +diagram. + +2. EDAC device driver for controlling RAS Features - Get feature's attribute +descriptors from EDAC RAS feature component and registers device's RAS +features with EDAC bus and exposes the features control attributes via +the sysfs EDAC bus. For example, /sys/bus/edac/devices//X/ + +3. RAS dynamic feature controller - Userspace sample modules in rasdaemon for +dynamic scrub/repair control to issue scrubbing/repair when excess number +of corrected memory errors are reported in a short span of time. + +RAS features +------------ +1. Memory Scrub +Memory scrub features are documented in `Documentation/edac/scrub.rst`. + +2. Memory Repair +Memory repair features are documented in `Documentation/edac/memory_repair.rst`. diff --git a/Documentation/edac/index.rst b/Documentation/edac/index.rst new file mode 100644 index 000000000000..d6778f4562dd --- /dev/null +++ b/Documentation/edac/index.rst @@ -0,0 +1,12 @@ +.. SPDX-License-Identifier: GPL-2.0 + +============== +EDAC Subsystem +============== + +.. toctree:: + :maxdepth: 1 + + features + memory_repair + scrub diff --git a/Documentation/edac/memory_repair.rst b/Documentation/edac/memory_repair.rst new file mode 100644 index 000000000000..ad7f869e0b15 --- /dev/null +++ b/Documentation/edac/memory_repair.rst @@ -0,0 +1,230 @@ +.. SPDX-License-Identifier: GPL-2.0 + +========================== +EDAC Memory Repair Control +========================== + +Copyright (c) 2024 HiSilicon Limited. + +:Author: Shiju Jose +:License: The GNU Free Documentation License, Version 1.2 + (dual licensed under the GPL v2) +:Original Reviewers: + +- Written for: 6.13 + +Introduction +------------ +Memory devices may support memory repair and maintenance operations to +perform repairs on faulty memory media. Various types of memory repair +features are available, such as Post Package Repair (PPR) and memory +sparing. + +Post Package Repair(PPR) +~~~~~~~~~~~~~~~~~~~~~~~~ +PPR maintenance operation requests the memory device to perform a repair +operation on its media if supported. A memory device may support two types +of PPR: Hard PPR (hPPR), for a permanent row repair and Soft PPR (sPPR), +for a temporary row repair. sPPR is much faster than hPPR, but the repair +is lost with a power cycle. During the execution of a PPR maintenance +operation, a memory device, may or may not retain data and may or may not +be able to process memory requests correctly. sPPR maintenance operation +may be executed at runtime, if data is retained and memory requests are +correctly processed. hPPR maintenance operation may be executed only at +boot because data would not be retained. In CXL devices, sPPR and hPPR +repair operations may be supported (CXL spec rev 3.1 sections 8.2.9.7.1.2 +and 8.2.9.7.1.3). + +Memory Sparing +~~~~~~~~~~~~~~ +Memory sparing is defined as a repair function that replaces a portion of +memory with a portion of functional memory at that same DPA. User space +tool, e.g. rasdaemon, may request the sparing operation for a given +address for which the uncorrectable error is reported. In CXL, +(CXL spec 3.1 section 8.2.9.7.1.4) subclasses for sparing operation vary +in terms of the scope of the sparing being performed. Cacheline sparing +subclass refers to a sparing action that can replace a full cacheline. +Row sparing is provided as an alternative to PPR sparing functions and its +scope is that of a single DDR row. Bank sparing allows an entire bank to +be replaced. Rank sparing is defined as an operation in which an entire +DDR rank is replaced. + +Use cases of generic memory repair features control +--------------------------------------------------- + +1. The Soft PPR (sPPR), Hard PPR (hPPR), and memory-sparing features share +similar control interfaces. Therefore, there is a need for a standardized, +generic sysfs repair control that is exposed to userspace and used by +administrators, scripts, and tools. + +2. When a CXL device detects a failure in a memory component, it may inform +the host of the need for a repair maintenance operation by using an event +record where the "maintenance needed" flag is set. The event record +specifies the DPA that requires repair. The kernel reports the corresponding +CXL general media or DRAM trace event to userspace, and userspace tools +(e.g., rasdaemon) initiate a repair maintenance operation in response to +the device request using the sysfs repair control. + +3. Userspace tools, such as rasdaemon, may request a PPR/sparing on a memory +region when an uncorrected memory error or an excess of corrected memory +errors is reported on that memory. + +4. Multiple PPR/sparing instances may be present per memory device. + +The File System +--------------- + +The control attributes of a registered scrubber instance could be +accessed in the + +/sys/bus/edac/devices//mem_repairX/ + +sysfs +----- + +Sysfs files are documented in + +`Documentation/ABI/testing/sysfs-edac-memory-repair`. + +Example +------- + +The usage takes the form shown in this example: + +1. CXL memory device sPPR + +# read capabilities + +root@localhost:~# cat /sys/bus/edac/devices/cxl_mem0/mem_repair0/dpa_support + +1 + +root@localhost:~# cat /sys/bus/edac/devices/cxl_mem0/mem_repair0/nibble_mask + +0x0 + +root@localhost:~# cat /sys/bus/edac/devices/cxl_mem0/mem_repair0/persist_mode_avail + +0 + +root@localhost:~# cat /sys/bus/edac/devices/cxl_mem0/mem_repair0/persist_mode + +0 + +root@localhost:~# cat /sys/bus/edac/devices/cxl_mem0/mem_repair0/repair_type + +0 + +root@localhost:~# cat /sys/bus/edac/devices/cxl_mem0/mem_repair0/repair_safe_when_in_use + +1 + +# set and readback attributes + +root@localhost:~# echo 0x8a2d > /sys/bus/edac/devices/cxl_mem0/mem_repair0/nibble_mask + +root@localhost:~# echo 0x300000 > /sys/bus/edac/devices/cxl_mem0/mem_repair0/dpa + +root@localhost:~# cat /sys/bus/edac/devices/cxl_mem0/mem_repair0/dpa + +0x300000 + +root@localhost:~# cat /sys/bus/edac/devices/cxl_mem0/mem_repair0/nibble_mask + +0x8a2d + +# issue repair operations + +# query and reapir return error if unsupported/failed. + +root@localhost:~# echo 1 > /sys/bus/edac/devices/cxl_mem0/mem_repair0/query + +root@localhost:~# echo 1 > /sys/bus/edac/devices/cxl_mem0/mem_repair0/repair + +1.2. CXL memory sparing + +# read capabilities + +root@localhost:~# cat /sys/bus/edac/devices/cxl_mem0/mem_repair1/repair_type + +2 + +root@localhost:~# cat /sys/bus/edac/devices/cxl_mem0/mem_repair1/dpa_support + +1 + +root@localhost:~# cat /sys/bus/edac/devices/cxl_mem0/mem_repair1/persist_mode_avail + +0,1 + +root@localhost:~# cat /sys/bus/edac/devices/cxl_mem0/mem_repair1/persist_mode + +0 + +root@localhost:~# cat /sys/bus/edac/devices/cxl_mem0/mem_repair1/repair_safe_when_in_use + +1 + +#set and readback attributes + +root@localhost:~# echo 1 > /sys/bus/edac/devices/cxl_mem0/mem_repair1/bank_group + +root@localhost:~# echo 3 > /sys/bus/edac/devices/cxl_mem0/mem_repair1/bank + +root@localhost:~# echo 2 > /sys/bus/edac/devices/cxl_mem0/mem_repair1/channel + +root@localhost:~# echo 7 > /sys/bus/edac/devices/cxl_mem0/mem_repair1/rank + +root@localhost:~# echo 0x4fb9 > /sys/bus/edac/devices/cxl_mem0/mem_repair1/row + +root@localhost:~# echo 5 > /sys/bus/edac/devices/cxl_mem0/mem_repair1/sub_channel + +root@localhost:~# echo 11 > /sys/bus/edac/devices/cxl_mem0/mem_repair1/column + +root@localhost:~# echo 0x85c2 > /sys/bus/edac/devices/cxl_mem0/mem_repair1/nibble_mask + +root@localhost:~# echo 0x700000 > /sys/bus/edac/devices/cxl_mem0/mem_repair1/dpa + +root@localhost:~# cat /sys/bus/edac/devices/cxl_mem0/mem_repair1/bank_group + +1 + +root@localhost:~# cat /sys/bus/edac/devices/cxl_mem0/mem_repair1/bank + +3 + +root@localhost:~# cat /sys/bus/edac/devices/cxl_mem0/mem_repair1/channel + +2 + +root@localhost:~# cat /sys/bus/edac/devices/cxl_mem0/mem_repair1/rank + +7 + +root@localhost:~# cat /sys/bus/edac/devices/cxl_mem0/mem_repair1/row + +0x4fb9 + +root@localhost:~# cat /sys/bus/edac/devices/cxl_mem0/mem_repair1/sub_channel + +5 + +root@localhost:~# cat /sys/bus/edac/devices/cxl_mem0/mem_repair1/column + +11 + +root@localhost:~# cat /sys/bus/edac/devices/cxl_mem0/mem_repair1/nibble_mask + +0x85c2 + +root@localhost:~# cat /sys/bus/edac/devices/cxl_mem0/mem_repair1/dpa + +0x700000 + +# issue repair operations + +# query and repair return error if unsupported/failed. + +root@localhost:~# echo 1 > /sys/bus/edac/devices/cxl_mem0/mem_repair1/query + +root@localhost:~# echo 1 > /sys/bus/edac/devices/cxl_mem0/mem_repair1/repair diff --git a/Documentation/edac/scrub.rst b/Documentation/edac/scrub.rst new file mode 100644 index 000000000000..d316f98604ad --- /dev/null +++ b/Documentation/edac/scrub.rst @@ -0,0 +1,393 @@ +.. SPDX-License-Identifier: GPL-2.0 + +=================== +EDAC Scrub Control +=================== + +Copyright (c) 2024 HiSilicon Limited. + +:Author: Shiju Jose +:License: The GNU Free Documentation License, Version 1.2 + (dual licensed under the GPL v2) +:Original Reviewers: + +- Written for: 6.13 + +Introduction +------------ +Increasing DRAM size and cost have made memory subsystem reliability an +important concern. These modules are used where potentially corrupted data +could cause expensive or fatal issues. Memory errors are among the top +hardware failures that cause server and workload crashes. + +Memory scrubbing is a feature where an ECC (Error-Correcting Code) engine +reads data from each memory media location, corrects with an ECC if +necessary and writes the corrected data back to the same memory media +location. + +The memory DIMMs can be scrubbed at a configurable rate to detect +uncorrected memory errors and attempt recovery from detected errors, +providing the following benefits. + +* Proactively scrubbing memory DIMMs reduces the chance of a correctable error becoming uncorrectable. + +* When detected, uncorrected errors caught in unallocated memory pages are isolated and prevented from being allocated to an application or the OS. + +* This reduces the likelihood of software or hardware products encountering memory errors. + +There are 2 types of memory scrubbing: + +1. Background (patrol) scrubbing of the RAM while the RAM is otherwise +idle. + +2. On-demand scrubbing for a specific address range or region of memory. + +Several types of interfaces to hardware memory scrubbers have been +identified, such as CXL memory device patrol scrub, CXL DDR5 ECS, ACPI +RAS2 memory scrubbing, and ACPI NVDIMM ARS (Address Range Scrub). + +The scrub control varies between different memory scrubbers. To allow +for standard userspace tooling there is a need to present these controls +with a standard ABI. + +The control mechanisms vary across different memory scrubbers. To enable +standardized userspace tooling, there is a need to present these controls +through a standardized ABI. + +Introduce a generic memory EDAC scrub control that allows users to manage +underlying scrubbers in the system through a standardized sysfs scrub +control interface. This common sysfs scrub control interface abstracts the +management of various scrubbing functionalities into a unified set of +functions. + +Use cases of common scrub control feature +----------------------------------------- +1. Several types of interfaces for hardware (HW) memory scrubbers have +been identified, including the CXL memory device patrol scrub, CXL DDR5 +ECS, ACPI RAS2 memory scrubbing features, ACPI NVDIMM ARS (Address Range +Scrub), and software-based memory scrubbers. Some of these scrubbers +support control over patrol (background) scrubbing (e.g., ACPI RAS2, CXL) +and/or on-demand scrubbing (e.g., ACPI RAS2, ACPI ARS). However, the scrub +control interfaces vary between memory scrubbers, highlighting the need for +a standardized, generic sysfs scrub control interface that is accessible to +userspace for administration and use by scripts/tools. + +2. User-space scrub controls allow users to disable scrubbing if necessary, +for example, to disable background patrol scrubbing or adjust the scrub +rate for performance-aware operations where background activities need to +be minimized or disabled. + +3. User-space tools enable on-demand scrubbing for specific address ranges, +provided that the scrubber supports this functionality. + +4. User-space tools can also control memory DIMM scrubbing at a configurable +scrub rate via sysfs scrub controls. This approach offers several benefits: + +* Detects uncorrectable memory errors early, before user access to affected memory, helping facilitate recovery. + +* Reduces the likelihood of correctable errors developing into uncorrectable errors. + +5. Policy control for hotplugged memory is necessary because there may not +be a system-wide BIOS or similar control to manage scrub settings for a CXL +device added after boot. Determining these settings is a policy decision, +balancing reliability against performance, so userspace should control it. +Therefore, a unified interface is recommended for handling this function in +a way that aligns with other similar interfaces, rather than creating a +separate one. + +Scrubbing features +------------------ +Comparison of various scrubbing features:: + + ................................................................ + . . ACPI . CXL patrol. CXL ECS . ARS . + . Name . RAS2 . scrub . . . + ................................................................ + . . . . . . + . On-demand . Supported . No . No . Supported . + . Scrubbing . . . . . + . . . . . . + ................................................................ + . . . . . . + . Background . Supported . Supported . Supported . No . + . scrubbing . . . . . + . . . . . . + ................................................................ + . . . . . . + . Mode of . Scrub ctrl. per device. per memory. Unknown . + . scrubbing . per NUMA . . media . . + . . domain. . . . . + ................................................................ + . . . . . . + . Query scrub . Supported . Supported . Supported . Supported . + . capabilities . . . . . + . . . . . . + ................................................................ + . . . . . . + . Setting . Supported . No . No . Supported . + . address range. . . . . + . . . . . . + ................................................................ + . . . . . . + . Setting . Supported . Supported . No . No . + . scrub rate . . . . . + . . . . . . + ................................................................ + . . . . . . + . Unit for . Not . in hours . No . No . + . scrub rate . Defined . . . . + . . . . . . + ................................................................ + . . Supported . . . . + . Scrub . on-demand . No . No . Supported . + . status/ . scrubbing . . . . + . Completion . only . . . . + ................................................................ + . UC error . .CXL general.CXL general. ACPI UCE . + . reporting . Exception .media/DRAM .media/DRAM . notify and. + . . .event/media.event/media. query . + . . .scan? .scan? . ARS status. + ................................................................ + . . . . . . + . Support for . Supported . Supported . Supported . No . + . EDAC control . . . . . + . . . . . . + ................................................................ + +CXL Memory Scrubbing features +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ +CXL spec r3.1 section 8.2.9.9.11.1 describes the memory device patrol scrub +control feature. The device patrol scrub proactively locates and makes +corrections to errors in regular cycle. The patrol scrub control allows the +request to configure patrol scrubber's input configurations. + +The patrol scrub control allows the requester to specify the number of +hours in which the patrol scrub cycles must be completed, provided that +the requested number is not less than the minimum number of hours for the +patrol scrub cycle that the device is capable of. In addition, the patrol +scrub controls allow the host to disable and enable the feature in case +disabling of the feature is needed for other purposes such as +performance-aware operations which require the background operations to be +turned off. + +Error Check Scrub (ECS) +~~~~~~~~~~~~~~~~~~~~~~~ +CXL spec r3.1 section 8.2.9.9.11.2 describes the Error Check Scrub (ECS) +is a feature defined in JEDEC DDR5 SDRAM Specification (JESD79-5) and +allows the DRAM to internally read, correct single-bit errors, and write +back corrected data bits to the DRAM array while providing transparency +to error counts. + +The DDR5 device contains number of memory media FRUs per device. The +DDR5 ECS feature and thus the ECS control driver supports configuring +the ECS parameters per FRU. + +ACPI RAS2 Hardware-based Memory Scrubbing +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ +ACPI spec 6.5 section 5.2.21 ACPI RAS2 describes ACPI RAS2 table +provides interfaces for platform RAS features and supports independent +RAS controls and capabilities for a given RAS feature for multiple +instances of the same component in a given system. +Memory RAS features apply to RAS capabilities, controls and operations +that are specific to memory. RAS2 PCC sub-spaces for memory-specific RAS +features have a Feature Type of 0x00 (Memory). + +The platform can use the hardware-based memory scrubbing feature to expose +controls and capabilities associated with hardware-based memory scrub +engines. The RAS2 memory scrubbing feature supports following as per spec, + +* Independent memory scrubbing controls for each NUMA domain, identified using its proximity domain. + +* Provision for background (patrol) scrubbing of the entire memory system, as well as on-demand scrubbing for a specific region of memory. + +ACPI Address Range Scrubbing(ARS) +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ +ACPI spec 6.5 section 9.19.7.2 describes Address Range Scrubbing(ARS). +ARS allows the platform to communicate memory errors to system software. +This capability allows system software to prevent accesses to addresses +with uncorrectable errors in memory. ARS functions manage all NVDIMMs +present in the system. Only one scrub can be in progress system wide +at any given time. +Following functions are supported as per the specification. + +1. Query ARS Capabilities for a given address range, indicates platform +supports the ACPI NVDIMM Root Device Unconsumed Error Notification. + +2. Start ARS triggers an Address Range Scrub for the given memory range. +Address scrubbing can be done for volatile memory, persistent memory, or both. + +3. Query ARS Status command allows software to get the status of ARS, +including the progress of ARS and ARS error record. + +4. Clear Uncorrectable Error. + +5. Translate SPA + +6. ARS Error Inject etc. + +The kernel supports an existing control for ARS and ARS is currently not +supported in EDAC. + +The File System +--------------- + +The control attributes of a registered scrubber instance could be +accessed in the + +/sys/bus/edac/devices//scrubX/ + +sysfs +----- + +Sysfs files are documented in + +`Documentation/ABI/testing/sysfs-edac-scrub`. + +`Documentation/ABI/testing/sysfs-edac-ecs`. + +Example +------- + +The usage takes the form shown in this example: + +1. CXL memory device patrol scrubber + +1.1 device based + +root@localhost:~# cat /sys/bus/edac/devices/cxl_mem0/scrub0/min_cycle_duration + +3600 + +root@localhost:~# cat /sys/bus/edac/devices/cxl_mem0/scrub0/max_cycle_duration + +918000 + +root@localhost:~# cat /sys/bus/edac/devices/cxl_mem0/scrub0/current_cycle_duration + +43200 + +root@localhost:~# echo 54000 > /sys/bus/edac/devices/cxl_mem0/scrub0/current_cycle_duration + +root@localhost:~# cat /sys/bus/edac/devices/cxl_mem0/scrub0/current_cycle_duration + +54000 + +root@localhost:~# echo 1 > /sys/bus/edac/devices/cxl_mem0/scrub0/enable_background + +root@localhost:~# cat /sys/bus/edac/devices/cxl_mem0/scrub0/enable_background + +1 + +root@localhost:~# echo 0 > /sys/bus/edac/devices/cxl_mem0/scrub0/enable_background + +root@localhost:~# cat /sys/bus/edac/devices/cxl_mem0/scrub0/enable_background + +0 + +1.2. region based + +root@localhost:~# cat /sys/bus/edac/devices/cxl_region0/scrub0/min_cycle_duration + +3600 + +root@localhost:~# cat /sys/bus/edac/devices/cxl_region0/scrub0/max_cycle_duration + +918000 + +root@localhost:~# cat /sys/bus/edac/devices/cxl_region0/scrub0/current_cycle_duration + +43200 + +root@localhost:~# echo 54000 > /sys/bus/edac/devices/cxl_region0/scrub0/current_cycle_duration + +root@localhost:~# cat /sys/bus/edac/devices/cxl_region0/scrub0/current_cycle_duration + +54000 + +root@localhost:~# echo 1 > /sys/bus/edac/devices/cxl_region0/scrub0/enable_background + +root@localhost:~# cat /sys/bus/edac/devices/cxl_region0/scrub0/enable_background + +1 + +root@localhost:~# echo 0 > /sys/bus/edac/devices/cxl_region0/scrub0/enable_background + +root@localhost:~# cat /sys/bus/edac/devices/cxl_region0/scrub0/enable_background + +0 + +2. RAS2 + +2.1 On demand scrubbing for a specific memory region. + +root@localhost:~# cat /sys/bus/edac/devices/acpi_ras_mem0/scrub0/min_cycle_duration + +3600 + +root@localhost:~# cat /sys/bus/edac/devices/acpi_ras_mem0/scrub0/max_cycle_duration + +86400 + +root@localhost:~# cat /sys/bus/edac/devices/acpi_ras_mem0/scrub0/current_cycle_duration + +36000 + +# Readback 'addr', non-zero - demand scrub is in progress, zero - scrub is finished. + +root@localhost:~# cat /sys/bus/edac/devices/acpi_ras_mem0/scrub0/addr + +0 + +root@localhost:~# echo 54000 > /sys/bus/edac/devices/acpi_ras_mem0/scrub0/current_cycle_duration + +root@localhost:~# echo 0x150000 > /sys/bus/edac/devices/acpi_ras_mem0/scrub0/size + +# Write 'addr' starts demand scrubbing, please make sure other attributes are set prior to that. + +root@localhost:~# echo 0x120000 > /sys/bus/edac/devices/acpi_ras_mem0/scrub0/addr + +root@localhost:~# cat /sys/bus/edac/devices/acpi_ras_mem0/scrub0/current_cycle_duration + +54000 + +# Readback 'addr', non-zero - demand scrub is in progress, zero - scrub is finished. + +root@localhost:~# cat /sys/bus/edac/devices/acpi_ras_mem0/scrub0/addr + +0x120000 + +root@localhost:~# cat /sys/bus/edac/devices/acpi_ras_mem0/scrub0/addr + +0 + +2.2 Background scrubbing the entire memory + +root@localhost:~# cat /sys/bus/edac/devices/acpi_ras_mem0/scrub0/min_cycle_duration + +3600 + +root@localhost:~# cat /sys/bus/edac/devices/acpi_ras_mem0/scrub0/max_cycle_duration + +86400 + +root@localhost:~# cat /sys/bus/edac/devices/acpi_ras_mem0/scrub0/current_cycle_duration + +36000 + +root@localhost:~# cat /sys/bus/edac/devices/acpi_ras_mem0/scrub0/enable_background + +0 + +root@localhost:~# echo 10800 > /sys/bus/edac/devices/acpi_ras_mem0/scrub0/current_cycle_duration + +root@localhost:~# echo 1 > /sys/bus/edac/devices/acpi_ras_mem0/scrub0/enable_background + +root@localhost:~# cat /sys/bus/edac/devices/acpi_ras_mem0/scrub0/enable_background + +1 + +root@localhost:~# cat /sys/bus/edac/devices/acpi_ras_mem0/scrub0/current_cycle_duration + +10800 + +root@localhost:~# echo 0 > /sys/bus/edac/devices/acpi_ras_mem0/scrub0/enable_background