drivers/dma/ioat/sysfs.c

Source file repositories/reference/linux-study-clean/drivers/dma/ioat/sysfs.c

File Facts

System
Linux kernel
Corpus path
drivers/dma/ioat/sysfs.c
Extension
.c
Size
4726 bytes
Lines
173
Domain
Driver Families
Bucket
drivers/dma
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 ioat_sysfs_entry {
	struct attribute attr;
	ssize_t (*show)(struct dma_chan *, char *);
	ssize_t (*store)(struct dma_chan *, const char *, size_t);
};

static ssize_t cap_show(struct dma_chan *c, char *page)
{
	struct dma_device *dma = c->device;

	return sprintf(page, "copy%s%s%s%s%s\n",
		       dma_has_cap(DMA_PQ, dma->cap_mask) ? " pq" : "",
		       dma_has_cap(DMA_PQ_VAL, dma->cap_mask) ? " pq_val" : "",
		       dma_has_cap(DMA_XOR, dma->cap_mask) ? " xor" : "",
		       dma_has_cap(DMA_XOR_VAL, dma->cap_mask) ? " xor_val" : "",
		       dma_has_cap(DMA_INTERRUPT, dma->cap_mask) ? " intr" : "");

}
static const struct ioat_sysfs_entry ioat_cap_attr = __ATTR_RO(cap);

static ssize_t version_show(struct dma_chan *c, char *page)
{
	struct dma_device *dma = c->device;
	struct ioatdma_device *ioat_dma = to_ioatdma_device(dma);

	return sprintf(page, "%d.%d\n",
		       ioat_dma->version >> 4, ioat_dma->version & 0xf);
}
static const struct ioat_sysfs_entry ioat_version_attr = __ATTR_RO(version);

static ssize_t
ioat_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
{
	const struct ioat_sysfs_entry *entry;
	struct ioatdma_chan *ioat_chan;

	entry = container_of_const(attr, struct ioat_sysfs_entry, attr);
	ioat_chan = container_of(kobj, struct ioatdma_chan, kobj);

	if (!entry->show)
		return -EIO;
	return entry->show(&ioat_chan->dma_chan, page);
}

static ssize_t
ioat_attr_store(struct kobject *kobj, struct attribute *attr,
const char *page, size_t count)
{
	const struct ioat_sysfs_entry *entry;
	struct ioatdma_chan *ioat_chan;

	entry = container_of_const(attr, struct ioat_sysfs_entry, attr);
	ioat_chan = container_of(kobj, struct ioatdma_chan, kobj);

	if (!entry->store)
		return -EIO;
	return entry->store(&ioat_chan->dma_chan, page, count);
}

static const struct sysfs_ops ioat_sysfs_ops = {
	.show	= ioat_attr_show,
	.store  = ioat_attr_store,
};

void ioat_kobject_add(struct ioatdma_device *ioat_dma, const struct kobj_type *type)
{
	struct dma_device *dma = &ioat_dma->dma_dev;
	struct dma_chan *c;

	list_for_each_entry(c, &dma->channels, device_node) {
		struct ioatdma_chan *ioat_chan = to_ioat_chan(c);
		struct kobject *parent = &c->dev->device.kobj;
		int err;

		err = kobject_init_and_add(&ioat_chan->kobj, type,
					   parent, "quickdata");
		if (err) {
			dev_warn(to_dev(ioat_chan),
				 "sysfs init error (%d), continuing...\n", err);
			kobject_put(&ioat_chan->kobj);
			set_bit(IOAT_KOBJ_INIT_FAIL, &ioat_chan->state);
		}
	}
}

void ioat_kobject_del(struct ioatdma_device *ioat_dma)
{
	struct dma_device *dma = &ioat_dma->dma_dev;
	struct dma_chan *c;

Annotation

Implementation Notes