virtio_pmem.h

 1/* SPDX-License-Identifier: GPL-2.0 */
 2/*
 3 * virtio_pmem.h: virtio pmem Driver
 4 *
 5 * Discovers persistent memory range information
 6 * from host and provides a virtio based flushing
 7 * interface.
 8 **/
 9
10#ifndef _LINUX_VIRTIO_PMEM_H
11#define _LINUX_VIRTIO_PMEM_H
12
13#include <linux/module.h>
14#include <uapi/linux/virtio_pmem.h>
15#include <linux/libnvdimm.h>
16#include <linux/mutex.h>
17#include <linux/spinlock.h>
18
19struct virtio_pmem_request {
20	struct virtio_pmem_req req;
21	struct virtio_pmem_resp resp;
22
23	/* Wait queue to process deferred work after ack from host */
24	wait_queue_head_t host_acked;
25	bool done;
26
27	/* Wait queue to process deferred work after virt queue buffer avail */
28	wait_queue_head_t wq_buf;
29	bool wq_buf_avail;
30	struct list_head list;
31};
32
33struct virtio_pmem {
34	struct virtio_device *vdev;
35
36	/* Virtio pmem request queue */
37	struct virtqueue *req_vq;
38
39	/* Serialize flush requests to the device. */
40	struct mutex flush_lock;
41
42	/* nvdimm bus registers virtio pmem device */
43	struct nvdimm_bus *nvdimm_bus;
44	struct nvdimm_bus_descriptor nd_desc;
45
46	/* List to store deferred work if virtqueue is full */
47	struct list_head req_list;
48
49	/* Synchronize virtqueue data */
50	spinlock_t pmem_lock;
51
52	/* Memory region information */
53	__u64 start;
54	__u64 size;
55};
56
57void virtio_pmem_host_ack(struct virtqueue *vq);
58int async_pmem_flush(struct nd_region *nd_region, struct bio *bio);
59#endif