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
33 #define VIRTIO_BLK_AUTO_NUM_QUEUES UINT16_MAX
40 uint32_t request_merging
;
44 uint32_t max_discard_sectors
;
45 uint32_t max_write_zeroes_sectors
;
46 bool x_enable_wce_if_config_wce
;
49 struct VirtIOBlockDataPlane
;
51 struct VirtIOBlockReq
;
52 typedef struct VirtIOBlock
{
53 VirtIODevice parent_obj
;
58 unsigned short sector_mask
;
60 VMChangeStateEntry
*change
;
61 bool dataplane_disabled
;
62 bool dataplane_started
;
63 struct VirtIOBlockDataPlane
*dataplane
;
64 uint64_t host_features
;
68 typedef struct VirtIOBlockReq
{
69 VirtQueueElement elem
;
73 struct virtio_blk_inhdr
*in
;
74 struct virtio_blk_outhdr out
;
77 struct VirtIOBlockReq
*next
;
78 struct VirtIOBlockReq
*mr_next
;
82 #define VIRTIO_BLK_MAX_MERGE_REQS 32
84 typedef struct MultiReqBuffer
{
85 VirtIOBlockReq
*reqs
[VIRTIO_BLK_MAX_MERGE_REQS
];
86 unsigned int num_reqs
;
90 bool virtio_blk_handle_vq(VirtIOBlock
*s
, VirtQueue
*vq
);
91 void virtio_blk_process_queued_requests(VirtIOBlock
*s
, bool is_bh
);