hw/intc/armv7m_nvic: Provide default "reset the system" behaviour for SYSRESETREQ
[qemu.git] / include / hw / virtio / virtio-blk.h
1 /*
2 * Virtio Block Device
3 *
4 * Copyright IBM, Corp. 2007
5 *
6 * Authors:
7 * Anthony Liguori <aliguori@us.ibm.com>
8 *
9 * This work is licensed under the terms of the GNU GPL, version 2. See
10 * the COPYING file in the top-level directory.
11 *
12 */
13
14 #ifndef QEMU_VIRTIO_BLK_H
15 #define QEMU_VIRTIO_BLK_H
16
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"
22
23 #define TYPE_VIRTIO_BLK "virtio-blk-device"
24 #define VIRTIO_BLK(obj) \
25 OBJECT_CHECK(VirtIOBlock, (obj), TYPE_VIRTIO_BLK)
26
27 /* This is the last element of the write scatter-gather list */
28 struct virtio_blk_inhdr
29 {
30 unsigned char status;
31 };
32
33 struct VirtIOBlkConf
34 {
35 BlockConf conf;
36 IOThread *iothread;
37 char *serial;
38 uint32_t request_merging;
39 uint16_t num_queues;
40 uint16_t queue_size;
41 bool seg_max_adjust;
42 uint32_t max_discard_sectors;
43 uint32_t max_write_zeroes_sectors;
44 bool x_enable_wce_if_config_wce;
45 };
46
47 struct VirtIOBlockDataPlane;
48
49 struct VirtIOBlockReq;
50 typedef struct VirtIOBlock {
51 VirtIODevice parent_obj;
52 BlockBackend *blk;
53 void *rq;
54 QEMUBH *bh;
55 VirtIOBlkConf conf;
56 unsigned short sector_mask;
57 bool original_wce;
58 VMChangeStateEntry *change;
59 bool dataplane_disabled;
60 bool dataplane_started;
61 struct VirtIOBlockDataPlane *dataplane;
62 uint64_t host_features;
63 size_t config_size;
64 } VirtIOBlock;
65
66 typedef struct VirtIOBlockReq {
67 VirtQueueElement elem;
68 int64_t sector_num;
69 VirtIOBlock *dev;
70 VirtQueue *vq;
71 struct virtio_blk_inhdr *in;
72 struct virtio_blk_outhdr out;
73 QEMUIOVector qiov;
74 size_t in_len;
75 struct VirtIOBlockReq *next;
76 struct VirtIOBlockReq *mr_next;
77 BlockAcctCookie acct;
78 } VirtIOBlockReq;
79
80 #define VIRTIO_BLK_MAX_MERGE_REQS 32
81
82 typedef struct MultiReqBuffer {
83 VirtIOBlockReq *reqs[VIRTIO_BLK_MAX_MERGE_REQS];
84 unsigned int num_reqs;
85 bool is_write;
86 } MultiReqBuffer;
87
88 bool virtio_blk_handle_vq(VirtIOBlock *s, VirtQueue *vq);
89 void virtio_blk_process_queued_requests(VirtIOBlock *s, bool is_bh);
90
91 #endif