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/spinlock.h> |
17 | |
18 | struct virtio_pmem_request { |
19 | struct virtio_pmem_req req; |
20 | struct virtio_pmem_resp resp; |
21 | |
22 | /* Wait queue to process deferred work after ack from host */ |
23 | wait_queue_head_t host_acked; |
24 | bool done; |
25 | |
26 | /* Wait queue to process deferred work after virt queue buffer avail */ |
27 | wait_queue_head_t wq_buf; |
28 | bool wq_buf_avail; |
29 | struct list_head list; |
30 | }; |
31 | |
32 | struct virtio_pmem { |
33 | struct virtio_device *vdev; |
34 | |
35 | /* Virtio pmem request queue */ |
36 | struct virtqueue *req_vq; |
37 | |
38 | /* nvdimm bus registers virtio pmem device */ |
39 | struct nvdimm_bus *nvdimm_bus; |
40 | struct nvdimm_bus_descriptor nd_desc; |
41 | |
42 | /* List to store deferred work if virtqueue is full */ |
43 | struct list_head req_list; |
44 | |
45 | /* Synchronize virtqueue data */ |
46 | spinlock_t pmem_lock; |
47 | |
48 | /* Memory region information */ |
49 | __u64 start; |
50 | __u64 size; |
51 | }; |
52 | |
53 | void virtio_pmem_host_ack(struct virtqueue *vq); |
54 | int async_pmem_flush(struct nd_region *nd_region, struct bio *bio); |
55 | #endif |
56 |