| Message ID | 20241101091735.1465-3-shiju.jose@huawei.com |
|---|---|
| State | Superseded |
| Headers | show |
| Series | EDAC: Scrub: introduce generic EDAC RAS control feature driver + CXL/ACPI-RAS2 drivers | expand |
On Fri, Nov 01, 2024 at 09:17:20AM +0000, shiju.jose@huawei.com wrote: > From: Shiju Jose <shiju.jose@huawei.com> > > 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/<dev-name>/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 <Jonathan.Cameron@huawei.com> > Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> > Signed-off-by: Shiju Jose <shiju.jose@huawei.com> > --- Minor comments inline. > 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 ... > 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; If we use scrub_cnt the same way as we use attr_gcnt, we do not need scrub_inst. Fan > 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 <linux/edac.h> > + > +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; > }; > > -- > 2.34.1 >
>-----Original Message----- >From: Fan Ni <nifan.cxl@gmail.com> >Sent: 08 November 2024 00:36 >To: Shiju Jose <shiju.jose@huawei.com> >Cc: linux-edac@vger.kernel.org; linux-cxl@vger.kernel.org; linux- >acpi@vger.kernel.org; linux-mm@kvack.org; linux-kernel@vger.kernel.org; >bp@alien8.de; tony.luck@intel.com; rafael@kernel.org; lenb@kernel.org; >mchehab@kernel.org; dan.j.williams@intel.com; dave@stgolabs.net; Jonathan >Cameron <jonathan.cameron@huawei.com>; gregkh@linuxfoundation.org; >sudeep.holla@arm.com; jassisinghbrar@gmail.com; dave.jiang@intel.com; >alison.schofield@intel.com; vishal.l.verma@intel.com; ira.weiny@intel.com; >david@redhat.com; Vilas.Sridharan@amd.com; leo.duran@amd.com; >Yazen.Ghannam@amd.com; rientjes@google.com; jiaqiyan@google.com; >Jon.Grimm@amd.com; dave.hansen@linux.intel.com; >naoya.horiguchi@nec.com; james.morse@arm.com; jthoughton@google.com; >somasundaram.a@hpe.com; erdemaktas@google.com; pgonda@google.com; >duenwen@google.com; gthelen@google.com; >wschwartz@amperecomputing.com; dferguson@amperecomputing.com; >wbs@os.amperecomputing.com; nifan.cxl@gmail.com; tanxiaofei ><tanxiaofei@huawei.com>; Zengtao (B) <prime.zeng@hisilicon.com>; Roberto >Sassu <roberto.sassu@huawei.com>; kangkang.shen@futurewei.com; >wanghuiqiang <wanghuiqiang@huawei.com>; Linuxarm ><linuxarm@huawei.com> >Subject: Re: [PATCH v15 02/15] EDAC: Add scrub control feature > >On Fri, Nov 01, 2024 at 09:17:20AM +0000, shiju.jose@huawei.com wrote: >> From: Shiju Jose <shiju.jose@huawei.com> >> >> 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/<dev-name>/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 <Jonathan.Cameron@huawei.com> >> Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> >> Signed-off-by: Shiju Jose <shiju.jose@huawei.com> >> --- > >Minor comments inline. > >> 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 > >... > >> 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; > >If we use scrub_cnt the same way as we use attr_gcnt, we do not need >scrub_inst. Hi Fan, Thanks for suggestion. Modified and done the same for EDAC memory repair feature as well. > >Fan >> for (feat = 0; feat < num_features; feat++, ras_features++) { >> switch (ras_features->ft_type) { >> - /* Add feature specific code */ [...] >-- >Fan Ni > Thanks, Shiju
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/<dev-name>/scrubX +Date: Jan 2025 +KernelVersion: 6.13 +Contact: linux-edac@vger.kernel.org +Description: + The sysfs EDAC bus devices /<dev-name>/scrubX subdirectory + belongs to an instance of memory scrub control feature, + where <dev-name> 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/<dev-name>/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/<dev-name>/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/<dev-name>/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/<dev-name>/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/<dev-name>/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/<dev-name>/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/<dev-name>/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 <linux/edac.h> + +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; };