| Pankaj Gupta | 6e84200 | 2019-07-05 19:33:23 +0530 | [diff] [blame] | 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 |