root / hw / virtio-blk.c @ 4b816985
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1 | 6e02c38d | aliguori | /*
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2 | 6e02c38d | aliguori | * Virtio Block Device
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3 | 6e02c38d | aliguori | *
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4 | 6e02c38d | aliguori | * Copyright IBM, Corp. 2007
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5 | 6e02c38d | aliguori | *
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6 | 6e02c38d | aliguori | * Authors:
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7 | 6e02c38d | aliguori | * Anthony Liguori <aliguori@us.ibm.com>
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8 | 6e02c38d | aliguori | *
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9 | 6e02c38d | aliguori | * This work is licensed under the terms of the GNU GPL, version 2. See
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10 | 6e02c38d | aliguori | * the COPYING file in the top-level directory.
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11 | 6e02c38d | aliguori | *
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12 | 6e02c38d | aliguori | */
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13 | 6e02c38d | aliguori | |
14 | 869a5c6d | aliguori | #include <qemu-common.h> |
15 | 869a5c6d | aliguori | #include <sysemu.h> |
16 | 6e02c38d | aliguori | #include "virtio-blk.h" |
17 | 6e02c38d | aliguori | #include "block_int.h" |
18 | 1063b8b1 | Christoph Hellwig | #ifdef __linux__
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19 | 1063b8b1 | Christoph Hellwig | # include <scsi/sg.h> |
20 | 1063b8b1 | Christoph Hellwig | #endif
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21 | 6e02c38d | aliguori | |
22 | 6e02c38d | aliguori | typedef struct VirtIOBlock |
23 | 6e02c38d | aliguori | { |
24 | 6e02c38d | aliguori | VirtIODevice vdev; |
25 | 6e02c38d | aliguori | BlockDriverState *bs; |
26 | 6e02c38d | aliguori | VirtQueue *vq; |
27 | 869a5c6d | aliguori | void *rq;
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28 | 6e02c38d | aliguori | } VirtIOBlock; |
29 | 6e02c38d | aliguori | |
30 | 6e02c38d | aliguori | static VirtIOBlock *to_virtio_blk(VirtIODevice *vdev)
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31 | 6e02c38d | aliguori | { |
32 | 6e02c38d | aliguori | return (VirtIOBlock *)vdev;
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33 | 6e02c38d | aliguori | } |
34 | 6e02c38d | aliguori | |
35 | 6e02c38d | aliguori | typedef struct VirtIOBlockReq |
36 | 6e02c38d | aliguori | { |
37 | 6e02c38d | aliguori | VirtIOBlock *dev; |
38 | 6e02c38d | aliguori | VirtQueueElement elem; |
39 | 6e02c38d | aliguori | struct virtio_blk_inhdr *in;
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40 | 6e02c38d | aliguori | struct virtio_blk_outhdr *out;
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41 | 1063b8b1 | Christoph Hellwig | struct virtio_scsi_inhdr *scsi;
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42 | d28a1b6e | aliguori | QEMUIOVector qiov; |
43 | 869a5c6d | aliguori | struct VirtIOBlockReq *next;
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44 | 6e02c38d | aliguori | } VirtIOBlockReq; |
45 | 6e02c38d | aliguori | |
46 | 869a5c6d | aliguori | static void virtio_blk_req_complete(VirtIOBlockReq *req, int status) |
47 | 869a5c6d | aliguori | { |
48 | 869a5c6d | aliguori | VirtIOBlock *s = req->dev; |
49 | 869a5c6d | aliguori | |
50 | 869a5c6d | aliguori | req->in->status = status; |
51 | d28a1b6e | aliguori | virtqueue_push(s->vq, &req->elem, req->qiov.size + sizeof(*req->in));
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52 | 869a5c6d | aliguori | virtio_notify(&s->vdev, s->vq); |
53 | 869a5c6d | aliguori | |
54 | 869a5c6d | aliguori | qemu_free(req); |
55 | 869a5c6d | aliguori | } |
56 | 869a5c6d | aliguori | |
57 | 869a5c6d | aliguori | static int virtio_blk_handle_write_error(VirtIOBlockReq *req, int error) |
58 | 869a5c6d | aliguori | { |
59 | 869a5c6d | aliguori | BlockInterfaceErrorAction action = drive_get_onerror(req->dev->bs); |
60 | 869a5c6d | aliguori | VirtIOBlock *s = req->dev; |
61 | 869a5c6d | aliguori | |
62 | 869a5c6d | aliguori | if (action == BLOCK_ERR_IGNORE)
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63 | 869a5c6d | aliguori | return 0; |
64 | 869a5c6d | aliguori | |
65 | 869a5c6d | aliguori | if ((error == ENOSPC && action == BLOCK_ERR_STOP_ENOSPC)
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66 | 869a5c6d | aliguori | || action == BLOCK_ERR_STOP_ANY) { |
67 | 869a5c6d | aliguori | req->next = s->rq; |
68 | 869a5c6d | aliguori | s->rq = req; |
69 | 869a5c6d | aliguori | vm_stop(0);
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70 | 869a5c6d | aliguori | } else {
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71 | 869a5c6d | aliguori | virtio_blk_req_complete(req, VIRTIO_BLK_S_IOERR); |
72 | 869a5c6d | aliguori | } |
73 | 869a5c6d | aliguori | |
74 | 869a5c6d | aliguori | return 1; |
75 | 869a5c6d | aliguori | } |
76 | 869a5c6d | aliguori | |
77 | 6e02c38d | aliguori | static void virtio_blk_rw_complete(void *opaque, int ret) |
78 | 6e02c38d | aliguori | { |
79 | 6e02c38d | aliguori | VirtIOBlockReq *req = opaque; |
80 | 6e02c38d | aliguori | |
81 | d28a1b6e | aliguori | if (ret && (req->out->type & VIRTIO_BLK_T_OUT)) {
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82 | 869a5c6d | aliguori | if (virtio_blk_handle_write_error(req, -ret))
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83 | 869a5c6d | aliguori | return;
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84 | 6e02c38d | aliguori | } |
85 | 6e02c38d | aliguori | |
86 | 869a5c6d | aliguori | virtio_blk_req_complete(req, VIRTIO_BLK_S_OK); |
87 | 869a5c6d | aliguori | } |
88 | 6e02c38d | aliguori | |
89 | 869a5c6d | aliguori | static VirtIOBlockReq *virtio_blk_alloc_request(VirtIOBlock *s)
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90 | 869a5c6d | aliguori | { |
91 | 869a5c6d | aliguori | VirtIOBlockReq *req = qemu_mallocz(sizeof(*req));
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92 | 487414f1 | aliguori | req->dev = s; |
93 | 869a5c6d | aliguori | return req;
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94 | 6e02c38d | aliguori | } |
95 | 6e02c38d | aliguori | |
96 | 6e02c38d | aliguori | static VirtIOBlockReq *virtio_blk_get_request(VirtIOBlock *s)
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97 | 6e02c38d | aliguori | { |
98 | 869a5c6d | aliguori | VirtIOBlockReq *req = virtio_blk_alloc_request(s); |
99 | 6e02c38d | aliguori | |
100 | 869a5c6d | aliguori | if (req != NULL) { |
101 | 869a5c6d | aliguori | if (!virtqueue_pop(s->vq, &req->elem)) {
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102 | 869a5c6d | aliguori | qemu_free(req); |
103 | 869a5c6d | aliguori | return NULL; |
104 | 869a5c6d | aliguori | } |
105 | 6e02c38d | aliguori | } |
106 | 6e02c38d | aliguori | |
107 | 6e02c38d | aliguori | return req;
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108 | 6e02c38d | aliguori | } |
109 | 6e02c38d | aliguori | |
110 | 1063b8b1 | Christoph Hellwig | #ifdef __linux__
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111 | 1063b8b1 | Christoph Hellwig | static void virtio_blk_handle_scsi(VirtIOBlockReq *req) |
112 | 1063b8b1 | Christoph Hellwig | { |
113 | 1063b8b1 | Christoph Hellwig | struct sg_io_hdr hdr;
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114 | 1063b8b1 | Christoph Hellwig | int ret, size = 0; |
115 | 1063b8b1 | Christoph Hellwig | int status;
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116 | 1063b8b1 | Christoph Hellwig | int i;
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117 | 1063b8b1 | Christoph Hellwig | |
118 | 1063b8b1 | Christoph Hellwig | /*
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119 | 1063b8b1 | Christoph Hellwig | * We require at least one output segment each for the virtio_blk_outhdr
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120 | 1063b8b1 | Christoph Hellwig | * and the SCSI command block.
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121 | 1063b8b1 | Christoph Hellwig | *
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122 | 1063b8b1 | Christoph Hellwig | * We also at least require the virtio_blk_inhdr, the virtio_scsi_inhdr
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123 | 1063b8b1 | Christoph Hellwig | * and the sense buffer pointer in the input segments.
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124 | 1063b8b1 | Christoph Hellwig | */
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125 | 1063b8b1 | Christoph Hellwig | if (req->elem.out_num < 2 || req->elem.in_num < 3) { |
126 | 1063b8b1 | Christoph Hellwig | virtio_blk_req_complete(req, VIRTIO_BLK_S_IOERR); |
127 | 1063b8b1 | Christoph Hellwig | return;
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128 | 1063b8b1 | Christoph Hellwig | } |
129 | 1063b8b1 | Christoph Hellwig | |
130 | 1063b8b1 | Christoph Hellwig | /*
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131 | 1063b8b1 | Christoph Hellwig | * No support for bidirection commands yet.
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132 | 1063b8b1 | Christoph Hellwig | */
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133 | 1063b8b1 | Christoph Hellwig | if (req->elem.out_num > 2 && req->elem.in_num > 3) { |
134 | 1063b8b1 | Christoph Hellwig | virtio_blk_req_complete(req, VIRTIO_BLK_S_UNSUPP); |
135 | 1063b8b1 | Christoph Hellwig | return;
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136 | 1063b8b1 | Christoph Hellwig | } |
137 | 1063b8b1 | Christoph Hellwig | |
138 | 1063b8b1 | Christoph Hellwig | /*
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139 | 1063b8b1 | Christoph Hellwig | * The scsi inhdr is placed in the second-to-last input segment, just
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140 | 1063b8b1 | Christoph Hellwig | * before the regular inhdr.
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141 | 1063b8b1 | Christoph Hellwig | */
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142 | 1063b8b1 | Christoph Hellwig | req->scsi = (void *)req->elem.in_sg[req->elem.in_num - 2].iov_base; |
143 | 1063b8b1 | Christoph Hellwig | size = sizeof(*req->in) + sizeof(*req->scsi); |
144 | 1063b8b1 | Christoph Hellwig | |
145 | 1063b8b1 | Christoph Hellwig | memset(&hdr, 0, sizeof(struct sg_io_hdr)); |
146 | 1063b8b1 | Christoph Hellwig | hdr.interface_id = 'S';
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147 | 1063b8b1 | Christoph Hellwig | hdr.cmd_len = req->elem.out_sg[1].iov_len;
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148 | 1063b8b1 | Christoph Hellwig | hdr.cmdp = req->elem.out_sg[1].iov_base;
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149 | 1063b8b1 | Christoph Hellwig | hdr.dxfer_len = 0;
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150 | 1063b8b1 | Christoph Hellwig | |
151 | 1063b8b1 | Christoph Hellwig | if (req->elem.out_num > 2) { |
152 | 1063b8b1 | Christoph Hellwig | /*
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153 | 1063b8b1 | Christoph Hellwig | * If there are more than the minimally required 2 output segments
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154 | 1063b8b1 | Christoph Hellwig | * there is write payload starting from the third iovec.
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155 | 1063b8b1 | Christoph Hellwig | */
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156 | 1063b8b1 | Christoph Hellwig | hdr.dxfer_direction = SG_DXFER_TO_DEV; |
157 | 1063b8b1 | Christoph Hellwig | hdr.iovec_count = req->elem.out_num - 2;
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158 | 1063b8b1 | Christoph Hellwig | |
159 | 1063b8b1 | Christoph Hellwig | for (i = 0; i < hdr.iovec_count; i++) |
160 | 1063b8b1 | Christoph Hellwig | hdr.dxfer_len += req->elem.out_sg[i + 2].iov_len;
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161 | 1063b8b1 | Christoph Hellwig | |
162 | 1063b8b1 | Christoph Hellwig | hdr.dxferp = req->elem.out_sg + 2;
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163 | 1063b8b1 | Christoph Hellwig | |
164 | 1063b8b1 | Christoph Hellwig | } else if (req->elem.in_num > 3) { |
165 | 1063b8b1 | Christoph Hellwig | /*
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166 | 1063b8b1 | Christoph Hellwig | * If we have more than 3 input segments the guest wants to actually
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167 | 1063b8b1 | Christoph Hellwig | * read data.
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168 | 1063b8b1 | Christoph Hellwig | */
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169 | 1063b8b1 | Christoph Hellwig | hdr.dxfer_direction = SG_DXFER_FROM_DEV; |
170 | 1063b8b1 | Christoph Hellwig | hdr.iovec_count = req->elem.in_num - 3;
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171 | 1063b8b1 | Christoph Hellwig | for (i = 0; i < hdr.iovec_count; i++) |
172 | 1063b8b1 | Christoph Hellwig | hdr.dxfer_len += req->elem.in_sg[i].iov_len; |
173 | 1063b8b1 | Christoph Hellwig | |
174 | 1063b8b1 | Christoph Hellwig | hdr.dxferp = req->elem.in_sg; |
175 | 1063b8b1 | Christoph Hellwig | size += hdr.dxfer_len; |
176 | 1063b8b1 | Christoph Hellwig | } else {
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177 | 1063b8b1 | Christoph Hellwig | /*
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178 | 1063b8b1 | Christoph Hellwig | * Some SCSI commands don't actually transfer any data.
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179 | 1063b8b1 | Christoph Hellwig | */
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180 | 1063b8b1 | Christoph Hellwig | hdr.dxfer_direction = SG_DXFER_NONE; |
181 | 1063b8b1 | Christoph Hellwig | } |
182 | 1063b8b1 | Christoph Hellwig | |
183 | 1063b8b1 | Christoph Hellwig | hdr.sbp = req->elem.in_sg[req->elem.in_num - 3].iov_base;
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184 | 1063b8b1 | Christoph Hellwig | hdr.mx_sb_len = req->elem.in_sg[req->elem.in_num - 3].iov_len;
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185 | 1063b8b1 | Christoph Hellwig | size += hdr.mx_sb_len; |
186 | 1063b8b1 | Christoph Hellwig | |
187 | 1063b8b1 | Christoph Hellwig | ret = bdrv_ioctl(req->dev->bs, SG_IO, &hdr); |
188 | 1063b8b1 | Christoph Hellwig | if (ret) {
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189 | 1063b8b1 | Christoph Hellwig | status = VIRTIO_BLK_S_UNSUPP; |
190 | 1063b8b1 | Christoph Hellwig | hdr.status = ret; |
191 | 1063b8b1 | Christoph Hellwig | hdr.resid = hdr.dxfer_len; |
192 | 1063b8b1 | Christoph Hellwig | } else if (hdr.status) { |
193 | 1063b8b1 | Christoph Hellwig | status = VIRTIO_BLK_S_IOERR; |
194 | 1063b8b1 | Christoph Hellwig | } else {
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195 | 1063b8b1 | Christoph Hellwig | status = VIRTIO_BLK_S_OK; |
196 | 1063b8b1 | Christoph Hellwig | } |
197 | 1063b8b1 | Christoph Hellwig | |
198 | 1063b8b1 | Christoph Hellwig | req->scsi->errors = hdr.status; |
199 | 1063b8b1 | Christoph Hellwig | req->scsi->residual = hdr.resid; |
200 | 1063b8b1 | Christoph Hellwig | req->scsi->sense_len = hdr.sb_len_wr; |
201 | 1063b8b1 | Christoph Hellwig | req->scsi->data_len = hdr.dxfer_len; |
202 | 1063b8b1 | Christoph Hellwig | |
203 | 1063b8b1 | Christoph Hellwig | virtio_blk_req_complete(req, status); |
204 | 1063b8b1 | Christoph Hellwig | } |
205 | 1063b8b1 | Christoph Hellwig | #else
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206 | 1063b8b1 | Christoph Hellwig | static void virtio_blk_handle_scsi(VirtIOBlockReq *req) |
207 | 1063b8b1 | Christoph Hellwig | { |
208 | 1063b8b1 | Christoph Hellwig | virtio_blk_req_complete(req, VIRTIO_BLK_S_UNSUPP); |
209 | 1063b8b1 | Christoph Hellwig | } |
210 | 1063b8b1 | Christoph Hellwig | #endif /* __linux__ */ |
211 | 1063b8b1 | Christoph Hellwig | |
212 | d28a1b6e | aliguori | static void virtio_blk_handle_write(VirtIOBlockReq *req) |
213 | 869a5c6d | aliguori | { |
214 | d28a1b6e | aliguori | bdrv_aio_writev(req->dev->bs, req->out->sector, &req->qiov, |
215 | d28a1b6e | aliguori | req->qiov.size / 512, virtio_blk_rw_complete, req);
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216 | d28a1b6e | aliguori | } |
217 | 869a5c6d | aliguori | |
218 | d28a1b6e | aliguori | static void virtio_blk_handle_read(VirtIOBlockReq *req) |
219 | d28a1b6e | aliguori | { |
220 | d28a1b6e | aliguori | bdrv_aio_readv(req->dev->bs, req->out->sector, &req->qiov, |
221 | d28a1b6e | aliguori | req->qiov.size / 512, virtio_blk_rw_complete, req);
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222 | 869a5c6d | aliguori | } |
223 | 869a5c6d | aliguori | |
224 | 6e02c38d | aliguori | static void virtio_blk_handle_output(VirtIODevice *vdev, VirtQueue *vq) |
225 | 6e02c38d | aliguori | { |
226 | 6e02c38d | aliguori | VirtIOBlock *s = to_virtio_blk(vdev); |
227 | 6e02c38d | aliguori | VirtIOBlockReq *req; |
228 | 6e02c38d | aliguori | |
229 | 6e02c38d | aliguori | while ((req = virtio_blk_get_request(s))) {
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230 | 6e02c38d | aliguori | if (req->elem.out_num < 1 || req->elem.in_num < 1) { |
231 | 6e02c38d | aliguori | fprintf(stderr, "virtio-blk missing headers\n");
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232 | 6e02c38d | aliguori | exit(1);
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233 | 6e02c38d | aliguori | } |
234 | 6e02c38d | aliguori | |
235 | 6e02c38d | aliguori | if (req->elem.out_sg[0].iov_len < sizeof(*req->out) || |
236 | 6e02c38d | aliguori | req->elem.in_sg[req->elem.in_num - 1].iov_len < sizeof(*req->in)) { |
237 | 6e02c38d | aliguori | fprintf(stderr, "virtio-blk header not in correct element\n");
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238 | 6e02c38d | aliguori | exit(1);
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239 | 6e02c38d | aliguori | } |
240 | 6e02c38d | aliguori | |
241 | 6e02c38d | aliguori | req->out = (void *)req->elem.out_sg[0].iov_base; |
242 | 6e02c38d | aliguori | req->in = (void *)req->elem.in_sg[req->elem.in_num - 1].iov_base; |
243 | 6e02c38d | aliguori | |
244 | 6e02c38d | aliguori | if (req->out->type & VIRTIO_BLK_T_SCSI_CMD) {
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245 | 1063b8b1 | Christoph Hellwig | virtio_blk_handle_scsi(req); |
246 | 6e02c38d | aliguori | } else if (req->out->type & VIRTIO_BLK_T_OUT) { |
247 | d28a1b6e | aliguori | qemu_iovec_init_external(&req->qiov, &req->elem.out_sg[1],
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248 | d28a1b6e | aliguori | req->elem.out_num - 1);
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249 | d28a1b6e | aliguori | virtio_blk_handle_write(req); |
250 | 6e02c38d | aliguori | } else {
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251 | d28a1b6e | aliguori | qemu_iovec_init_external(&req->qiov, &req->elem.in_sg[0],
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252 | d28a1b6e | aliguori | req->elem.in_num - 1);
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253 | d28a1b6e | aliguori | virtio_blk_handle_read(req); |
254 | 6e02c38d | aliguori | } |
255 | 6e02c38d | aliguori | } |
256 | 6e02c38d | aliguori | /*
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257 | 6e02c38d | aliguori | * FIXME: Want to check for completions before returning to guest mode,
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258 | 6e02c38d | aliguori | * so cached reads and writes are reported as quickly as possible. But
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259 | 6e02c38d | aliguori | * that should be done in the generic block layer.
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260 | 6e02c38d | aliguori | */
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261 | 6e02c38d | aliguori | } |
262 | 6e02c38d | aliguori | |
263 | 869a5c6d | aliguori | static void virtio_blk_dma_restart_cb(void *opaque, int running, int reason) |
264 | 869a5c6d | aliguori | { |
265 | 869a5c6d | aliguori | VirtIOBlock *s = opaque; |
266 | 869a5c6d | aliguori | VirtIOBlockReq *req = s->rq; |
267 | 869a5c6d | aliguori | |
268 | 869a5c6d | aliguori | if (!running)
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269 | 869a5c6d | aliguori | return;
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270 | 869a5c6d | aliguori | |
271 | 869a5c6d | aliguori | s->rq = NULL;
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272 | 869a5c6d | aliguori | |
273 | 869a5c6d | aliguori | while (req) {
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274 | 869a5c6d | aliguori | virtio_blk_handle_write(req); |
275 | 869a5c6d | aliguori | req = req->next; |
276 | 869a5c6d | aliguori | } |
277 | 869a5c6d | aliguori | } |
278 | 869a5c6d | aliguori | |
279 | 6e02c38d | aliguori | static void virtio_blk_reset(VirtIODevice *vdev) |
280 | 6e02c38d | aliguori | { |
281 | 6e02c38d | aliguori | /*
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282 | 6e02c38d | aliguori | * This should cancel pending requests, but can't do nicely until there
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283 | 6e02c38d | aliguori | * are per-device request lists.
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284 | 6e02c38d | aliguori | */
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285 | 6e02c38d | aliguori | qemu_aio_flush(); |
286 | 6e02c38d | aliguori | } |
287 | 6e02c38d | aliguori | |
288 | 6e02c38d | aliguori | static void virtio_blk_update_config(VirtIODevice *vdev, uint8_t *config) |
289 | 6e02c38d | aliguori | { |
290 | 6e02c38d | aliguori | VirtIOBlock *s = to_virtio_blk(vdev); |
291 | 6e02c38d | aliguori | struct virtio_blk_config blkcfg;
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292 | 6e02c38d | aliguori | uint64_t capacity; |
293 | 6e02c38d | aliguori | int cylinders, heads, secs;
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294 | 6e02c38d | aliguori | |
295 | 6e02c38d | aliguori | bdrv_get_geometry(s->bs, &capacity); |
296 | 6e02c38d | aliguori | bdrv_get_geometry_hint(s->bs, &cylinders, &heads, &secs); |
297 | 6e02c38d | aliguori | stq_raw(&blkcfg.capacity, capacity); |
298 | 6e02c38d | aliguori | stl_raw(&blkcfg.seg_max, 128 - 2); |
299 | 6e02c38d | aliguori | stw_raw(&blkcfg.cylinders, cylinders); |
300 | 6e02c38d | aliguori | blkcfg.heads = heads; |
301 | 6e02c38d | aliguori | blkcfg.sectors = secs; |
302 | 6e02c38d | aliguori | memcpy(config, &blkcfg, sizeof(blkcfg));
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303 | 6e02c38d | aliguori | } |
304 | 6e02c38d | aliguori | |
305 | 6e02c38d | aliguori | static uint32_t virtio_blk_get_features(VirtIODevice *vdev)
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306 | 6e02c38d | aliguori | { |
307 | 1063b8b1 | Christoph Hellwig | uint32_t features = 0;
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308 | 1063b8b1 | Christoph Hellwig | |
309 | 1063b8b1 | Christoph Hellwig | features |= (1 << VIRTIO_BLK_F_SEG_MAX);
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310 | 1063b8b1 | Christoph Hellwig | features |= (1 << VIRTIO_BLK_F_GEOMETRY);
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311 | 1063b8b1 | Christoph Hellwig | #ifdef __linux__
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312 | 1063b8b1 | Christoph Hellwig | features |= (1 << VIRTIO_BLK_F_SCSI);
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313 | 1063b8b1 | Christoph Hellwig | #endif
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314 | 1063b8b1 | Christoph Hellwig | |
315 | 1063b8b1 | Christoph Hellwig | return features;
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316 | 6e02c38d | aliguori | } |
317 | 6e02c38d | aliguori | |
318 | 6e02c38d | aliguori | static void virtio_blk_save(QEMUFile *f, void *opaque) |
319 | 6e02c38d | aliguori | { |
320 | 6e02c38d | aliguori | VirtIOBlock *s = opaque; |
321 | 869a5c6d | aliguori | VirtIOBlockReq *req = s->rq; |
322 | 869a5c6d | aliguori | |
323 | 6e02c38d | aliguori | virtio_save(&s->vdev, f); |
324 | 869a5c6d | aliguori | |
325 | 869a5c6d | aliguori | while (req) {
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326 | 869a5c6d | aliguori | qemu_put_sbyte(f, 1);
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327 | 869a5c6d | aliguori | qemu_put_buffer(f, (unsigned char*)&req->elem, sizeof(req->elem)); |
328 | 869a5c6d | aliguori | req = req->next; |
329 | 869a5c6d | aliguori | } |
330 | 869a5c6d | aliguori | qemu_put_sbyte(f, 0);
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331 | 6e02c38d | aliguori | } |
332 | 6e02c38d | aliguori | |
333 | 6e02c38d | aliguori | static int virtio_blk_load(QEMUFile *f, void *opaque, int version_id) |
334 | 6e02c38d | aliguori | { |
335 | 6e02c38d | aliguori | VirtIOBlock *s = opaque; |
336 | 6e02c38d | aliguori | |
337 | 869a5c6d | aliguori | if (version_id != 2) |
338 | 6e02c38d | aliguori | return -EINVAL;
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339 | 6e02c38d | aliguori | |
340 | 6e02c38d | aliguori | virtio_load(&s->vdev, f); |
341 | 869a5c6d | aliguori | while (qemu_get_sbyte(f)) {
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342 | 869a5c6d | aliguori | VirtIOBlockReq *req = virtio_blk_alloc_request(s); |
343 | 869a5c6d | aliguori | qemu_get_buffer(f, (unsigned char*)&req->elem, sizeof(req->elem)); |
344 | 869a5c6d | aliguori | req->next = s->rq; |
345 | 869a5c6d | aliguori | s->rq = req->next; |
346 | 869a5c6d | aliguori | } |
347 | 6e02c38d | aliguori | |
348 | 6e02c38d | aliguori | return 0; |
349 | 6e02c38d | aliguori | } |
350 | 6e02c38d | aliguori | |
351 | 07e3af9a | Paul Brook | static void virtio_blk_init(PCIDevice *pci_dev) |
352 | 6e02c38d | aliguori | { |
353 | 6e02c38d | aliguori | VirtIOBlock *s; |
354 | 6e02c38d | aliguori | int cylinders, heads, secs;
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355 | 6e02c38d | aliguori | static int virtio_blk_id; |
356 | 07e3af9a | Paul Brook | BlockDriverState *bs; |
357 | cf21e106 | Paul Brook | |
358 | 07e3af9a | Paul Brook | s = (VirtIOBlock *)virtio_init_pci(pci_dev, "virtio-blk",
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359 | 9b32d5a5 | aliguori | PCI_VENDOR_ID_REDHAT_QUMRANET, |
360 | 9b32d5a5 | aliguori | PCI_DEVICE_ID_VIRTIO_BLOCK, |
361 | 99b3718e | aliguori | PCI_VENDOR_ID_REDHAT_QUMRANET, |
362 | 99b3718e | aliguori | VIRTIO_ID_BLOCK, |
363 | 173a543b | blueswir1 | PCI_CLASS_STORAGE_OTHER, 0x00,
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364 | cf21e106 | Paul Brook | sizeof(struct virtio_blk_config)); |
365 | 6e02c38d | aliguori | |
366 | 07e3af9a | Paul Brook | bs = qdev_init_bdrv(&pci_dev->qdev, IF_VIRTIO); |
367 | 6e02c38d | aliguori | s->vdev.get_config = virtio_blk_update_config; |
368 | 6e02c38d | aliguori | s->vdev.get_features = virtio_blk_get_features; |
369 | 6e02c38d | aliguori | s->vdev.reset = virtio_blk_reset; |
370 | 6e02c38d | aliguori | s->bs = bs; |
371 | 869a5c6d | aliguori | s->rq = NULL;
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372 | b0a7b120 | aliguori | bs->private = &s->vdev.pci_dev; |
373 | 6e02c38d | aliguori | bdrv_guess_geometry(s->bs, &cylinders, &heads, &secs); |
374 | 6e02c38d | aliguori | bdrv_set_geometry_hint(s->bs, cylinders, heads, secs); |
375 | 6e02c38d | aliguori | |
376 | 6e02c38d | aliguori | s->vq = virtio_add_queue(&s->vdev, 128, virtio_blk_handle_output);
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377 | 6e02c38d | aliguori | |
378 | 869a5c6d | aliguori | qemu_add_vm_change_state_handler(virtio_blk_dma_restart_cb, s); |
379 | 869a5c6d | aliguori | register_savevm("virtio-blk", virtio_blk_id++, 2, |
380 | 6e02c38d | aliguori | virtio_blk_save, virtio_blk_load, s); |
381 | 07e3af9a | Paul Brook | } |
382 | 6e02c38d | aliguori | |
383 | 07e3af9a | Paul Brook | static void virtio_blk_register_devices(void) |
384 | 07e3af9a | Paul Brook | { |
385 | 07e3af9a | Paul Brook | pci_qdev_register("virtio-blk", sizeof(VirtIOBlock), virtio_blk_init); |
386 | 6e02c38d | aliguori | } |
387 | 07e3af9a | Paul Brook | |
388 | 07e3af9a | Paul Brook | device_init(virtio_blk_register_devices) |