| Message ID | 20240911090447.751-4-shiju.jose@huawei.com (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | EDAC: Scrub: introduce generic EDAC RAS control feature driver + CXL/ACPI-RAS2 drivers | expand |
On Wed, Sep 11, 2024 at 10:04:32AM +0100, shiju.jose@huawei.com wrote: > From: Shiju Jose <shiju.jose@huawei.com> > > Add EDAC ECS (Error Check Scrub) control driver supports configuring s/supports/to support/ > the 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. > > The memory devices support ECS feature register with the EDAC ECS driver > and thus with the generic EDAC RAS feature driver, which adds the sysfs > ECS control interface. The ECS control attributes are exposed to > userspace in /sys/bus/edac/devices/<dev-name>/ecs_fruX/. > > Generic EDAC ECS driver and the common sysfs ECS interface promotes > unambiguous control from the userspace irrespective of the underlying > devices, support ECS feature. s/, support/which support/ ??? > > The support for ECS feature is added separately because the DDR5 ECS > features control attributes are dissimilar from those of the scrub > feature. > > The sysfs ECS attr nodes would be present only if the client driver > has implemented the corresponding attr callback function and pass s/pass/passed/ > in ops to the EDAC RAS feature 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> > --- > Documentation/ABI/testing/sysfs-edac-ecs | 78 +++++ > drivers/edac/Makefile | 2 +- > drivers/edac/edac_device.c | 3 + > drivers/edac/edac_ecs.c | 376 +++++++++++++++++++++++ > include/linux/edac.h | 33 ++ > 5 files changed, 491 insertions(+), 1 deletion(-) > create mode 100644 Documentation/ABI/testing/sysfs-edac-ecs > create mode 100755 drivers/edac/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..1eb35acd4e5e > --- /dev/null > +++ b/Documentation/ABI/testing/sysfs-edac-ecs > @@ -0,0 +1,78 @@ > +What: /sys/bus/edac/devices/<dev-name>/ecs_fru* Maybe s/ecs_fru*/ecs_fruX/?? The same for below. > +Date: Oct 2024 > +KernelVersion: 6.12 > +Contact: linux-edac@vger.kernel.org > +Description: > + The sysfs EDAC bus devices /<dev-name>/ecs_fru* subdirectory > + belongs to the memory media ECS (Error Check Scrub) control > + feature, where <dev-name> directory corresponds to a device > + registered with the EDAC ECS driver and thus registered with > + the generic EDAC RAS driver too. > + /ecs_fru* belongs to the media FRUs (Field replaceable unit) > + under the memory device. > + The sysfs ECS attr nodes would be present only if the client > + driver has implemented the corresponding attr callback > + function and pass in ops to the EDAC RAS feature driver s/pass/passed/ Fan > + during registration. > + > +What: /sys/bus/edac/devices/<dev-name>/ecs_fru*/log_entry_type > +Date: Oct 2024 > +KernelVersion: 6.12 > +Contact: linux-edac@vger.kernel.org > +Description: > + (RW) The log entry type of how the DDR5 ECS log is reported. > + 00b - per DRAM. > + 01b - per memory media FRU. > + > +What: /sys/bus/edac/devices/<dev-name>/ecs_fru*/log_entry_type_per_dram > +Date: Oct 2024 > +KernelVersion: 6.12 > +Contact: linux-edac@vger.kernel.org > +Description: > + (RO) True if current log entry type is per DRAM. > + > +What: /sys/bus/edac/devices/<dev-name>/ecs_fru*/log_entry_type_per_memory_media > +Date: Oct 2024 > +KernelVersion: 6.12 > +Contact: linux-edac@vger.kernel.org > +Description: > + (RO) True if current log entry type is per memory media FRU. > + > +What: /sys/bus/edac/devices/<dev-name>/ecs_fru*/mode > +Date: Oct 2024 > +KernelVersion: 6.12 > +Contact: linux-edac@vger.kernel.org > +Description: > + (RW) The mode of how the DDR5 ECS counts the errors. > + 0 - ECS counts rows with errors. > + 1 - ECS counts codewords with errors. > + > +What: /sys/bus/edac/devices/<dev-name>/ecs_fru*/mode_counts_rows > +Date: Oct 2024 > +KernelVersion: 6.12 > +Contact: linux-edac@vger.kernel.org > +Description: > + (RO) True if current mode is ECS counts rows with errors. > + > +What: /sys/bus/edac/devices/<dev-name>/ecs_fru*/mode_counts_codewords > +Date: Oct 2024 > +KernelVersion: 6.12 > +Contact: linux-edac@vger.kernel.org > +Description: > + (RO) True if current mode is ECS counts codewords with errors. > + > +What: /sys/bus/edac/devices/<dev-name>/ecs_fru*/reset > +Date: Oct 2024 > +KernelVersion: 6.12 > +Contact: linux-edac@vger.kernel.org > +Description: > + (WO) ECS reset ECC counter. > + 0 - normal, ECC counter running actively. > + 1 - reset ECC counter to the default value. > + > +What: /sys/bus/edac/devices/<dev-name>/ecs_fru*/threshold > +Date: Oct 2024 > +KernelVersion: 6.12 > +Contact: linux-edac@vger.kernel.org > +Description: > + (RW) ECS threshold count per GB of memory cells. > diff --git a/drivers/edac/Makefile b/drivers/edac/Makefile > index fbf0e39ec678..62115eff6a9a 100644 > --- a/drivers/edac/Makefile > +++ b/drivers/edac/Makefile > @@ -10,7 +10,7 @@ obj-$(CONFIG_EDAC) := edac_core.o > > edac_core-y := edac_mc.o edac_device.o edac_mc_sysfs.o > edac_core-y += edac_module.o edac_device_sysfs.o wq.o > -edac_core-y += edac_scrub.o > +edac_core-y += edac_scrub.o edac_ecs.o > > edac_core-$(CONFIG_EDAC_DEBUG) += debugfs.o > > diff --git a/drivers/edac/edac_device.c b/drivers/edac/edac_device.c > index 6381896b6424..9cac9ae75080 100644 > --- a/drivers/edac/edac_device.c > +++ b/drivers/edac/edac_device.c > @@ -623,6 +623,9 @@ static int edac_dev_feat_init(struct device *parent, > num = ras_feat->ecs_info.num_media_frus; > dev_data->ecs_ops = ras_feat->ecs_ops; > dev_data->private = ras_feat->ctx; > + ret = edac_ecs_get_desc(parent, attr_groups, num); > + if (ret) > + return ret; > return num; > case RAS_FEAT_PPR: > dev_data->ppr_ops = ras_feat->ppr_ops; > diff --git a/drivers/edac/edac_ecs.c b/drivers/edac/edac_ecs.c > new file mode 100755 > index 000000000000..50915ab1e769 > --- /dev/null > +++ b/drivers/edac/edac_ecs.c > @@ -0,0 +1,376 @@ > +// SPDX-License-Identifier: GPL-2.0 > +/* > + * ECS driver supporting controlling on die error check scrub > + * (e.g. DDR5 ECS). The common sysfs ECS interface promotes > + * unambiguous access from the userspace. > + * > + * Copyright (c) 2024 HiSilicon Limited. > + */ > + > +#define pr_fmt(fmt) "EDAC ECS: " fmt > + > +#include <linux/edac.h> > + > +#define EDAC_ECS_FRU_NAME "ecs_fru" > + > +enum edac_ecs_attributes { > + ECS_LOG_ENTRY_TYPE, > + ECS_LOG_ENTRY_TYPE_PER_DRAM, > + ECS_LOG_ENTRY_TYPE_PER_MEMORY_MEDIA, > + ECS_MODE, > + ECS_MODE_COUNTS_ROWS, > + ECS_MODE_COUNTS_CODEWORDS, > + 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 ecs_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) > + > +static ssize_t log_entry_type_show(struct device *ras_feat_dev, > + struct device_attribute *attr, > + char *buf) > +{ > + struct edac_ecs_dev_attr *ecs_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; > + u32 val; > + int ret; > + > + ret = ops->get_log_entry_type(ras_feat_dev->parent, ctx->ecs.private, > + ecs_dev_attr->fru_id, &val); > + if (ret) > + return ret; > + > + return sysfs_emit(buf, "%u\n", val); > +} > + > +static ssize_t log_entry_type_store(struct device *ras_feat_dev, > + struct device_attribute *attr, > + const char *buf, size_t len) > +{ > + struct edac_ecs_dev_attr *ecs_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; > + long val; > + int ret; > + > + ret = kstrtol(buf, 0, &val); > + if (ret < 0) > + return ret; > + > + ret = ops->set_log_entry_type(ras_feat_dev->parent, ctx->ecs.private, > + ecs_dev_attr->fru_id, val); > + if (ret) > + return ret; > + > + return len; > +} > + > +static ssize_t log_entry_type_per_dram_show(struct device *ras_feat_dev, > + struct device_attribute *attr, > + char *buf) > +{ > + struct edac_ecs_dev_attr *ecs_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; > + u32 val; > + int ret; > + > + ret = ops->get_log_entry_type_per_dram(ras_feat_dev->parent, ctx->ecs.private, > + ecs_dev_attr->fru_id, &val); > + if (ret) > + return ret; > + > + return sysfs_emit(buf, "%u\n", val); > +} > + > +static ssize_t log_entry_type_per_memory_media_show(struct device *ras_feat_dev, > + struct device_attribute *attr, > + char *buf) > +{ > + struct edac_ecs_dev_attr *ecs_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; > + u32 val; > + int ret; > + > + ret = ops->get_log_entry_type_per_memory_media(ras_feat_dev->parent, > + ctx->ecs.private, > + ecs_dev_attr->fru_id, &val); > + if (ret) > + return ret; > + > + return sysfs_emit(buf, "%u\n", val); > +} > + > +static ssize_t mode_show(struct device *ras_feat_dev, > + struct device_attribute *attr, > + char *buf) > +{ > + struct edac_ecs_dev_attr *ecs_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; > + u32 val; > + int ret; > + > + ret = ops->get_mode(ras_feat_dev->parent, ctx->ecs.private, > + ecs_dev_attr->fru_id, &val); > + if (ret) > + return ret; > + > + return sysfs_emit(buf, "%u\n", val); > +} > + > +static ssize_t mode_store(struct device *ras_feat_dev, > + struct device_attribute *attr, > + const char *buf, size_t len) > +{ > + struct edac_ecs_dev_attr *ecs_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; > + long val; > + int ret; > + > + ret = kstrtol(buf, 0, &val); > + if (ret < 0) > + return ret; > + > + ret = ops->set_mode(ras_feat_dev->parent, ctx->ecs.private, > + ecs_dev_attr->fru_id, val); > + if (ret) > + return ret; > + > + return len; > +} > + > +static ssize_t mode_counts_rows_show(struct device *ras_feat_dev, > + struct device_attribute *attr, > + char *buf) > +{ > + struct edac_ecs_dev_attr *ecs_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; > + u32 val; > + int ret; > + > + ret = ops->get_mode_counts_rows(ras_feat_dev->parent, ctx->ecs.private, > + ecs_dev_attr->fru_id, &val); > + if (ret) > + return ret; > + > + return sysfs_emit(buf, "%u\n", val); > +} > + > +static ssize_t mode_counts_codewords_show(struct device *ras_feat_dev, > + struct device_attribute *attr, > + char *buf) > +{ > + struct edac_ecs_dev_attr *ecs_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; > + u32 val; > + int ret; > + > + ret = ops->get_mode_counts_codewords(ras_feat_dev->parent, ctx->ecs.private, > + ecs_dev_attr->fru_id, &val); > + if (ret) > + return ret; > + > + return sysfs_emit(buf, "%u\n", val); > +} > + > +static ssize_t reset_store(struct device *ras_feat_dev, > + struct device_attribute *attr, > + const char *buf, size_t len) > +{ > + struct edac_ecs_dev_attr *ecs_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; > + long val; > + int ret; > + > + ret = kstrtol(buf, 0, &val); > + if (ret < 0) > + return ret; > + > + ret = ops->reset(ras_feat_dev->parent, ctx->ecs.private, > + ecs_dev_attr->fru_id, val); > + if (ret) > + return ret; > + > + return len; > +} > + > +static ssize_t threshold_show(struct device *ras_feat_dev, > + struct device_attribute *attr, char *buf) > +{ > + struct edac_ecs_dev_attr *ecs_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; > + int ret; > + u32 val; > + > + ret = ops->get_threshold(ras_feat_dev->parent, ctx->ecs.private, > + ecs_dev_attr->fru_id, &val); > + if (ret) > + return ret; > + > + return sysfs_emit(buf, "%u\n", val); > +} > + > +static ssize_t threshold_store(struct device *ras_feat_dev, > + struct device_attribute *attr, > + const char *buf, size_t len) > +{ > + struct edac_ecs_dev_attr *ecs_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; > + long val; > + int ret; > + > + ret = kstrtol(buf, 0, &val); > + if (ret < 0) > + return ret; > + > + ret = ops->set_threshold(ras_feat_dev->parent, ctx->ecs.private, > + ecs_dev_attr->fru_id, val); > + if (ret) > + return ret; > + > + return len; > +} > + > +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 && ops->set_log_entry_type) > + return a->mode; > + if (ops->get_log_entry_type) > + return 0444; > + return 0; > + case ECS_LOG_ENTRY_TYPE_PER_DRAM: > + return ops->get_log_entry_type_per_dram ? a->mode : 0; > + case ECS_LOG_ENTRY_TYPE_PER_MEMORY_MEDIA: > + return ops->get_log_entry_type_per_memory_media ? a->mode : 0; > + case ECS_MODE: > + if (ops->get_mode && ops->set_mode) > + return a->mode; > + if (ops->get_mode) > + return 0444; > + return 0; > + case ECS_MODE_COUNTS_ROWS: > + return ops->get_mode_counts_rows ? a->mode : 0; > + case ECS_MODE_COUNTS_CODEWORDS: > + return ops->get_mode_counts_codewords ? a->mode : 0; > + case ECS_RESET: > + return ops->reset ? a->mode : 0; > + case ECS_THRESHOLD: > + if (ops->get_threshold && ops->set_threshold) > + return a->mode; > + if (ops->get_threshold) > + return 0444; > + return 0; > + default: > + 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->ecs_dev_attr[0] = EDAC_ECS_ATTR_RW(log_entry_type, fru); > + fru_ctx->ecs_dev_attr[1] = EDAC_ECS_ATTR_RO(log_entry_type_per_dram, fru); > + fru_ctx->ecs_dev_attr[2] = EDAC_ECS_ATTR_RO(log_entry_type_per_memory_media, fru); > + fru_ctx->ecs_dev_attr[3] = EDAC_ECS_ATTR_RW(mode, fru); > + fru_ctx->ecs_dev_attr[4] = EDAC_ECS_ATTR_RO(mode_counts_rows, fru); > + fru_ctx->ecs_dev_attr[5] = EDAC_ECS_ATTR_RO(mode_counts_codewords, fru); > + fru_ctx->ecs_dev_attr[6] = EDAC_ECS_ATTR_WO(reset, fru); > + fru_ctx->ecs_dev_attr[7] = EDAC_ECS_ATTR_RW(threshold, fru); > + for (i = 0; i < ECS_MAX_ATTRS; i++) > + fru_ctx->ecs_attrs[i] = &fru_ctx->ecs_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 attrribute group container > + * @num_media_frus: number of media FRUs in the device > + * > + * Returns 0 on success, error otherwise. > + */ > +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/include/linux/edac.h b/include/linux/edac.h > index aae8262b9863..90cb90cf5272 100644 > --- a/include/linux/edac.h > +++ b/include/linux/edac.h > @@ -704,10 +704,43 @@ int edac_scrub_get_desc(struct device *scrub_dev, > const struct attribute_group **attr_groups, > u8 instance); > > +/** > + * struct 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_log_entry_type_per_dram: read the log entry type per dram value. > + * @get_log_entry_type_memory_media: read the log entry type per memory media value. > + * @get_mode: read the mode value. > + * @set_mode: set the mode value. > + * @get_mode_counts_rows: read the mode counts rows value. > + * @get_mode_counts_codewords: read the mode counts codewords value. > + * @reset: reset the ECS counter. > + * @get_threshold: read the threshold value. > + * @set_threshold: set the threshold value. > + */ > +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_log_entry_type_per_dram)(struct device *dev, void *drv_data, > + int fru_id, u32 *val); > + int (*get_log_entry_type_per_memory_media)(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 (*get_mode_counts_rows)(struct device *dev, void *drv_data, int fru_id, u32 *val); > + int (*get_mode_counts_codewords)(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 > */ > -- > 2.34.1 >
diff --git a/Documentation/ABI/testing/sysfs-edac-ecs b/Documentation/ABI/testing/sysfs-edac-ecs new file mode 100644 index 000000000000..1eb35acd4e5e --- /dev/null +++ b/Documentation/ABI/testing/sysfs-edac-ecs @@ -0,0 +1,78 @@ +What: /sys/bus/edac/devices/<dev-name>/ecs_fru* +Date: Oct 2024 +KernelVersion: 6.12 +Contact: linux-edac@vger.kernel.org +Description: + The sysfs EDAC bus devices /<dev-name>/ecs_fru* subdirectory + belongs to the memory media ECS (Error Check Scrub) control + feature, where <dev-name> directory corresponds to a device + registered with the EDAC ECS driver and thus registered with + the generic EDAC RAS driver too. + /ecs_fru* belongs to the media FRUs (Field replaceable unit) + under the memory device. + The sysfs ECS attr nodes would be present only if the client + driver has implemented the corresponding attr callback + function and pass in ops to the EDAC RAS feature driver + during registration. + +What: /sys/bus/edac/devices/<dev-name>/ecs_fru*/log_entry_type +Date: Oct 2024 +KernelVersion: 6.12 +Contact: linux-edac@vger.kernel.org +Description: + (RW) The log entry type of how the DDR5 ECS log is reported. + 00b - per DRAM. + 01b - per memory media FRU. + +What: /sys/bus/edac/devices/<dev-name>/ecs_fru*/log_entry_type_per_dram +Date: Oct 2024 +KernelVersion: 6.12 +Contact: linux-edac@vger.kernel.org +Description: + (RO) True if current log entry type is per DRAM. + +What: /sys/bus/edac/devices/<dev-name>/ecs_fru*/log_entry_type_per_memory_media +Date: Oct 2024 +KernelVersion: 6.12 +Contact: linux-edac@vger.kernel.org +Description: + (RO) True if current log entry type is per memory media FRU. + +What: /sys/bus/edac/devices/<dev-name>/ecs_fru*/mode +Date: Oct 2024 +KernelVersion: 6.12 +Contact: linux-edac@vger.kernel.org +Description: + (RW) The mode of how the DDR5 ECS counts the errors. + 0 - ECS counts rows with errors. + 1 - ECS counts codewords with errors. + +What: /sys/bus/edac/devices/<dev-name>/ecs_fru*/mode_counts_rows +Date: Oct 2024 +KernelVersion: 6.12 +Contact: linux-edac@vger.kernel.org +Description: + (RO) True if current mode is ECS counts rows with errors. + +What: /sys/bus/edac/devices/<dev-name>/ecs_fru*/mode_counts_codewords +Date: Oct 2024 +KernelVersion: 6.12 +Contact: linux-edac@vger.kernel.org +Description: + (RO) True if current mode is ECS counts codewords with errors. + +What: /sys/bus/edac/devices/<dev-name>/ecs_fru*/reset +Date: Oct 2024 +KernelVersion: 6.12 +Contact: linux-edac@vger.kernel.org +Description: + (WO) ECS reset ECC counter. + 0 - normal, ECC counter running actively. + 1 - reset ECC counter to the default value. + +What: /sys/bus/edac/devices/<dev-name>/ecs_fru*/threshold +Date: Oct 2024 +KernelVersion: 6.12 +Contact: linux-edac@vger.kernel.org +Description: + (RW) ECS threshold count per GB of memory cells. diff --git a/drivers/edac/Makefile b/drivers/edac/Makefile index fbf0e39ec678..62115eff6a9a 100644 --- a/drivers/edac/Makefile +++ b/drivers/edac/Makefile @@ -10,7 +10,7 @@ obj-$(CONFIG_EDAC) := edac_core.o edac_core-y := edac_mc.o edac_device.o edac_mc_sysfs.o edac_core-y += edac_module.o edac_device_sysfs.o wq.o -edac_core-y += edac_scrub.o +edac_core-y += edac_scrub.o edac_ecs.o edac_core-$(CONFIG_EDAC_DEBUG) += debugfs.o diff --git a/drivers/edac/edac_device.c b/drivers/edac/edac_device.c index 6381896b6424..9cac9ae75080 100644 --- a/drivers/edac/edac_device.c +++ b/drivers/edac/edac_device.c @@ -623,6 +623,9 @@ static int edac_dev_feat_init(struct device *parent, num = ras_feat->ecs_info.num_media_frus; dev_data->ecs_ops = ras_feat->ecs_ops; dev_data->private = ras_feat->ctx; + ret = edac_ecs_get_desc(parent, attr_groups, num); + if (ret) + return ret; return num; case RAS_FEAT_PPR: dev_data->ppr_ops = ras_feat->ppr_ops; diff --git a/drivers/edac/edac_ecs.c b/drivers/edac/edac_ecs.c new file mode 100755 index 000000000000..50915ab1e769 --- /dev/null +++ b/drivers/edac/edac_ecs.c @@ -0,0 +1,376 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * ECS driver supporting controlling on die error check scrub + * (e.g. DDR5 ECS). The common sysfs ECS interface promotes + * unambiguous access from the userspace. + * + * Copyright (c) 2024 HiSilicon Limited. + */ + +#define pr_fmt(fmt) "EDAC ECS: " fmt + +#include <linux/edac.h> + +#define EDAC_ECS_FRU_NAME "ecs_fru" + +enum edac_ecs_attributes { + ECS_LOG_ENTRY_TYPE, + ECS_LOG_ENTRY_TYPE_PER_DRAM, + ECS_LOG_ENTRY_TYPE_PER_MEMORY_MEDIA, + ECS_MODE, + ECS_MODE_COUNTS_ROWS, + ECS_MODE_COUNTS_CODEWORDS, + 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 ecs_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) + +static ssize_t log_entry_type_show(struct device *ras_feat_dev, + struct device_attribute *attr, + char *buf) +{ + struct edac_ecs_dev_attr *ecs_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; + u32 val; + int ret; + + ret = ops->get_log_entry_type(ras_feat_dev->parent, ctx->ecs.private, + ecs_dev_attr->fru_id, &val); + if (ret) + return ret; + + return sysfs_emit(buf, "%u\n", val); +} + +static ssize_t log_entry_type_store(struct device *ras_feat_dev, + struct device_attribute *attr, + const char *buf, size_t len) +{ + struct edac_ecs_dev_attr *ecs_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; + long val; + int ret; + + ret = kstrtol(buf, 0, &val); + if (ret < 0) + return ret; + + ret = ops->set_log_entry_type(ras_feat_dev->parent, ctx->ecs.private, + ecs_dev_attr->fru_id, val); + if (ret) + return ret; + + return len; +} + +static ssize_t log_entry_type_per_dram_show(struct device *ras_feat_dev, + struct device_attribute *attr, + char *buf) +{ + struct edac_ecs_dev_attr *ecs_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; + u32 val; + int ret; + + ret = ops->get_log_entry_type_per_dram(ras_feat_dev->parent, ctx->ecs.private, + ecs_dev_attr->fru_id, &val); + if (ret) + return ret; + + return sysfs_emit(buf, "%u\n", val); +} + +static ssize_t log_entry_type_per_memory_media_show(struct device *ras_feat_dev, + struct device_attribute *attr, + char *buf) +{ + struct edac_ecs_dev_attr *ecs_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; + u32 val; + int ret; + + ret = ops->get_log_entry_type_per_memory_media(ras_feat_dev->parent, + ctx->ecs.private, + ecs_dev_attr->fru_id, &val); + if (ret) + return ret; + + return sysfs_emit(buf, "%u\n", val); +} + +static ssize_t mode_show(struct device *ras_feat_dev, + struct device_attribute *attr, + char *buf) +{ + struct edac_ecs_dev_attr *ecs_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; + u32 val; + int ret; + + ret = ops->get_mode(ras_feat_dev->parent, ctx->ecs.private, + ecs_dev_attr->fru_id, &val); + if (ret) + return ret; + + return sysfs_emit(buf, "%u\n", val); +} + +static ssize_t mode_store(struct device *ras_feat_dev, + struct device_attribute *attr, + const char *buf, size_t len) +{ + struct edac_ecs_dev_attr *ecs_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; + long val; + int ret; + + ret = kstrtol(buf, 0, &val); + if (ret < 0) + return ret; + + ret = ops->set_mode(ras_feat_dev->parent, ctx->ecs.private, + ecs_dev_attr->fru_id, val); + if (ret) + return ret; + + return len; +} + +static ssize_t mode_counts_rows_show(struct device *ras_feat_dev, + struct device_attribute *attr, + char *buf) +{ + struct edac_ecs_dev_attr *ecs_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; + u32 val; + int ret; + + ret = ops->get_mode_counts_rows(ras_feat_dev->parent, ctx->ecs.private, + ecs_dev_attr->fru_id, &val); + if (ret) + return ret; + + return sysfs_emit(buf, "%u\n", val); +} + +static ssize_t mode_counts_codewords_show(struct device *ras_feat_dev, + struct device_attribute *attr, + char *buf) +{ + struct edac_ecs_dev_attr *ecs_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; + u32 val; + int ret; + + ret = ops->get_mode_counts_codewords(ras_feat_dev->parent, ctx->ecs.private, + ecs_dev_attr->fru_id, &val); + if (ret) + return ret; + + return sysfs_emit(buf, "%u\n", val); +} + +static ssize_t reset_store(struct device *ras_feat_dev, + struct device_attribute *attr, + const char *buf, size_t len) +{ + struct edac_ecs_dev_attr *ecs_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; + long val; + int ret; + + ret = kstrtol(buf, 0, &val); + if (ret < 0) + return ret; + + ret = ops->reset(ras_feat_dev->parent, ctx->ecs.private, + ecs_dev_attr->fru_id, val); + if (ret) + return ret; + + return len; +} + +static ssize_t threshold_show(struct device *ras_feat_dev, + struct device_attribute *attr, char *buf) +{ + struct edac_ecs_dev_attr *ecs_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; + int ret; + u32 val; + + ret = ops->get_threshold(ras_feat_dev->parent, ctx->ecs.private, + ecs_dev_attr->fru_id, &val); + if (ret) + return ret; + + return sysfs_emit(buf, "%u\n", val); +} + +static ssize_t threshold_store(struct device *ras_feat_dev, + struct device_attribute *attr, + const char *buf, size_t len) +{ + struct edac_ecs_dev_attr *ecs_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; + long val; + int ret; + + ret = kstrtol(buf, 0, &val); + if (ret < 0) + return ret; + + ret = ops->set_threshold(ras_feat_dev->parent, ctx->ecs.private, + ecs_dev_attr->fru_id, val); + if (ret) + return ret; + + return len; +} + +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 && ops->set_log_entry_type) + return a->mode; + if (ops->get_log_entry_type) + return 0444; + return 0; + case ECS_LOG_ENTRY_TYPE_PER_DRAM: + return ops->get_log_entry_type_per_dram ? a->mode : 0; + case ECS_LOG_ENTRY_TYPE_PER_MEMORY_MEDIA: + return ops->get_log_entry_type_per_memory_media ? a->mode : 0; + case ECS_MODE: + if (ops->get_mode && ops->set_mode) + return a->mode; + if (ops->get_mode) + return 0444; + return 0; + case ECS_MODE_COUNTS_ROWS: + return ops->get_mode_counts_rows ? a->mode : 0; + case ECS_MODE_COUNTS_CODEWORDS: + return ops->get_mode_counts_codewords ? a->mode : 0; + case ECS_RESET: + return ops->reset ? a->mode : 0; + case ECS_THRESHOLD: + if (ops->get_threshold && ops->set_threshold) + return a->mode; + if (ops->get_threshold) + return 0444; + return 0; + default: + 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->ecs_dev_attr[0] = EDAC_ECS_ATTR_RW(log_entry_type, fru); + fru_ctx->ecs_dev_attr[1] = EDAC_ECS_ATTR_RO(log_entry_type_per_dram, fru); + fru_ctx->ecs_dev_attr[2] = EDAC_ECS_ATTR_RO(log_entry_type_per_memory_media, fru); + fru_ctx->ecs_dev_attr[3] = EDAC_ECS_ATTR_RW(mode, fru); + fru_ctx->ecs_dev_attr[4] = EDAC_ECS_ATTR_RO(mode_counts_rows, fru); + fru_ctx->ecs_dev_attr[5] = EDAC_ECS_ATTR_RO(mode_counts_codewords, fru); + fru_ctx->ecs_dev_attr[6] = EDAC_ECS_ATTR_WO(reset, fru); + fru_ctx->ecs_dev_attr[7] = EDAC_ECS_ATTR_RW(threshold, fru); + for (i = 0; i < ECS_MAX_ATTRS; i++) + fru_ctx->ecs_attrs[i] = &fru_ctx->ecs_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 attrribute group container + * @num_media_frus: number of media FRUs in the device + * + * Returns 0 on success, error otherwise. + */ +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/include/linux/edac.h b/include/linux/edac.h index aae8262b9863..90cb90cf5272 100644 --- a/include/linux/edac.h +++ b/include/linux/edac.h @@ -704,10 +704,43 @@ int edac_scrub_get_desc(struct device *scrub_dev, const struct attribute_group **attr_groups, u8 instance); +/** + * struct 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_log_entry_type_per_dram: read the log entry type per dram value. + * @get_log_entry_type_memory_media: read the log entry type per memory media value. + * @get_mode: read the mode value. + * @set_mode: set the mode value. + * @get_mode_counts_rows: read the mode counts rows value. + * @get_mode_counts_codewords: read the mode counts codewords value. + * @reset: reset the ECS counter. + * @get_threshold: read the threshold value. + * @set_threshold: set the threshold value. + */ +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_log_entry_type_per_dram)(struct device *dev, void *drv_data, + int fru_id, u32 *val); + int (*get_log_entry_type_per_memory_media)(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 (*get_mode_counts_rows)(struct device *dev, void *drv_data, int fru_id, u32 *val); + int (*get_mode_counts_codewords)(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 */