diff options
Diffstat (limited to 'drivers/edac/ecs.c')
| -rwxr-xr-x | drivers/edac/ecs.c | 205 |
1 files changed, 205 insertions, 0 deletions
diff --git a/drivers/edac/ecs.c b/drivers/edac/ecs.c new file mode 100755 index 000000000000..1d51838a60c1 --- /dev/null +++ b/drivers/edac/ecs.c @@ -0,0 +1,205 @@ +// 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) 2024-2025 HiSilicon Limited. + */ + +#include <linux/edac.h> + +#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); +} |