drivers/nvdimm/virtio_pmem.h

Source file repositories/reference/linux-study-clean/drivers/nvdimm/virtio_pmem.h

File Facts

System
Linux kernel
Corpus path
drivers/nvdimm/virtio_pmem.h
Extension
.h
Size
1386 bytes
Lines
60
Domain
Driver Families
Bucket
drivers/nvdimm
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 virtio_pmem_request {
	struct virtio_pmem_req req;
	struct virtio_pmem_resp resp;

	/* Wait queue to process deferred work after ack from host */
	wait_queue_head_t host_acked;
	bool done;

	/* Wait queue to process deferred work after virt queue buffer avail */
	wait_queue_head_t wq_buf;
	bool wq_buf_avail;
	struct list_head list;
};

struct virtio_pmem {
	struct virtio_device *vdev;

	/* Virtio pmem request queue */
	struct virtqueue *req_vq;

	/* Serialize flush requests to the device. */
	struct mutex flush_lock;

	/* nvdimm bus registers virtio pmem device */
	struct nvdimm_bus *nvdimm_bus;
	struct nvdimm_bus_descriptor nd_desc;

	/* List to store deferred work if virtqueue is full */
	struct list_head req_list;

	/* Synchronize virtqueue data */
	spinlock_t pmem_lock;

	/* Memory region information */
	__u64 start;
	__u64 size;
};

void virtio_pmem_host_ack(struct virtqueue *vq);
int async_pmem_flush(struct nd_region *nd_region, struct bio *bio);
#endif

Annotation

Implementation Notes