/* 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/module.h> #include <uapi/linux/virtio_pmem.h> #include <linux/libnvdimm.h> #include <linux/mutex.h> #include <linux/spinlock.h> struct virtio_pmem_request { struct virtio_pmem_req req; struct virtio_pmem_resp resp; /* 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 { struct virtio_device *vdev; /* Virtio pmem request queue */ struct virtqueue *req_vq; /* Serialize flush requests to the device. */ struct mutex flush_lock; /* 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; /* Synchronize virtqueue data */ spinlock_t pmem_lock; /* Memory region information */ __u64 start; __u64 size; }; void virtio_pmem_host_ack(struct virtqueue *vq); int async_pmem_flush(struct nd_region *nd_region, struct bio *bio); #endif