LXR linux/drivers/nvdimm/virtio

   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
  18struct 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
  32struct 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
  53void virtio_pmem_host_ack(struct virtqueue *vq);
  54int async_pmem_flush(struct nd_region *nd_region, struct bio *bio);
  55#endif
  56