4 * Copyright IBM, Corp. 2007
7 * Anthony Liguori <aliguori@us.ibm.com>
9 * This work is licensed under the terms of the GNU GPL, version 2. See
10 * the COPYING file in the top-level directory.
14 #ifndef _QEMU_VIRTIO_BLK_H
15 #define _QEMU_VIRTIO_BLK_H
17 #include "standard-headers/linux/virtio_blk.h"
18 #include "hw/virtio/virtio.h"
19 #include "hw/block/block.h"
20 #include "sysemu/iothread.h"
21 #include "sysemu/block-backend.h"
23 #define TYPE_VIRTIO_BLK "virtio-blk-device"
24 #define VIRTIO_BLK(obj) \
25 OBJECT_CHECK(VirtIOBlock, (obj), TYPE_VIRTIO_BLK)
27 /* This is the last element of the write scatter-gather list */
28 struct virtio_blk_inhdr
41 uint32_t request_merging;
44 struct VirtIOBlockDataPlane;
46 struct VirtIOBlockReq;
47 typedef struct VirtIOBlock {
48 VirtIODevice parent_obj;
54 unsigned short sector_mask;
56 VMChangeStateEntry *change;
57 /* Function to push to vq and notify guest */
58 void (*complete_request)(struct VirtIOBlockReq *req, unsigned char status);
59 Notifier migration_state_notifier;
60 struct VirtIOBlockDataPlane *dataplane;
63 typedef struct VirtIOBlockReq {
66 VirtQueueElement elem;
67 struct virtio_blk_inhdr *in;
68 struct virtio_blk_outhdr out;
71 struct VirtIOBlockReq *next;
72 struct VirtIOBlockReq *mr_next;
76 #define VIRTIO_BLK_MAX_MERGE_REQS 32
78 typedef struct MultiReqBuffer {
79 VirtIOBlockReq *reqs[VIRTIO_BLK_MAX_MERGE_REQS];
80 unsigned int num_reqs;
84 VirtIOBlockReq *virtio_blk_alloc_request(VirtIOBlock *s);
86 void virtio_blk_free_request(VirtIOBlockReq *req);
88 void virtio_blk_handle_request(VirtIOBlockReq *req, MultiReqBuffer *mrb);
90 void virtio_blk_submit_multireq(BlockBackend *blk, MultiReqBuffer *mrb);