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// 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);
}
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