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/* SPDX-License-Identifier: GPL-2.0 */
/*
* virtio_pmem.h: virtio pmem Driver
*
* Discovers persistent memory range information
* from host and provides a virtio based flushing
* interface.
**/
#ifndef _LINUX_VIRTIO_PMEM_H
#define _LINUX_VIRTIO_PMEM_H
#include <linux/dma-mapping.h>
#include <linux/module.h>
#include <uapi/linux/virtio_pmem.h>
#include <linux/kref.h>
#include <linux/libnvdimm.h>
#include <linux/mutex.h>
#include <linux/spinlock.h>
#include <linux/workqueue.h>
struct virtio_pmem_request {
struct kref kref;
/* 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_req req;
__dma_from_device_group_begin(resp);
struct virtio_pmem_resp resp;
__dma_from_device_group_end(resp);
};
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;
/* Complete asynchronous FUA flushes outside the submit path. */
struct workqueue_struct *flush_wq;
/* 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;
/* Request currently owned by the virtqueue. */
struct virtio_pmem_request *req_inflight;
/* Fail fast and wake waiters if the request virtqueue is broken. */
bool broken;
/* Synchronize virtqueue data */
spinlock_t pmem_lock;
/* Memory region information */
__u64 start;
__u64 size;
};
void virtio_pmem_host_ack(struct virtqueue *vq);
void virtio_pmem_mark_broken(struct virtio_pmem *vpmem);
void virtio_pmem_drain(struct virtio_pmem *vpmem);
int async_pmem_flush(struct nd_region *nd_region, struct bio *bio);
#endif
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