drivers/edac/scrub.c

Source file repositories/reference/linux-study-clean/drivers/edac/scrub.c

File Facts

System
Linux kernel
Corpus path
drivers/edac/scrub.c
Extension
.c
Size
6401 bytes
Lines
211
Domain
Driver Families
Bucket
drivers/edac
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

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;
		}

Annotation

Implementation Notes