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// 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) 2024-2025 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);
}
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