/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* virtio_pmem.h: virtio pmem Driver
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*
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* Discovers persistent memory range information
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* from host and provides a virtio based flushing
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* interface.
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**/
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#ifndef _LINUX_VIRTIO_PMEM_H
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#define _LINUX_VIRTIO_PMEM_H
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#include <linux/module.h>
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#include <uapi/linux/virtio_pmem.h>
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#include <linux/libnvdimm.h>
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#include <linux/spinlock.h>
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struct virtio_pmem_request {
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struct virtio_pmem_req req;
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struct virtio_pmem_resp resp;
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/* Wait queue to process deferred work after ack from host */
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wait_queue_head_t host_acked;
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bool done;
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/* Wait queue to process deferred work after virt queue buffer avail */
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wait_queue_head_t wq_buf;
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bool wq_buf_avail;
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struct list_head list;
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};
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struct virtio_pmem {
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struct virtio_device *vdev;
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/* Virtio pmem request queue */
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struct virtqueue *req_vq;
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/* nvdimm bus registers virtio pmem device */
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struct nvdimm_bus *nvdimm_bus;
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struct nvdimm_bus_descriptor nd_desc;
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/* List to store deferred work if virtqueue is full */
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struct list_head req_list;
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/* Synchronize virtqueue data */
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spinlock_t pmem_lock;
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/* Memory region information */
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__u64 start;
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__u64 size;
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};
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void virtio_pmem_host_ack(struct virtqueue *vq);
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int async_pmem_flush(struct nd_region *nd_region, struct bio *bio);
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#endif
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