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e467cde2 RR |
1 | //#define DEBUG |
2 | #include <linux/spinlock.h> | |
5a0e3ad6 | 3 | #include <linux/slab.h> |
e467cde2 | 4 | #include <linux/blkdev.h> |
8a6cfeb6 | 5 | #include <linux/smp_lock.h> |
e467cde2 RR |
6 | #include <linux/hdreg.h> |
7 | #include <linux/virtio.h> | |
8 | #include <linux/virtio_blk.h> | |
3d1266c7 JA |
9 | #include <linux/scatterlist.h> |
10 | ||
4f3bf19c | 11 | #define PART_BITS 4 |
e467cde2 | 12 | |
d50ed907 | 13 | static int major, index; |
4f3bf19c | 14 | |
e467cde2 RR |
15 | struct virtio_blk |
16 | { | |
17 | spinlock_t lock; | |
18 | ||
19 | struct virtio_device *vdev; | |
20 | struct virtqueue *vq; | |
21 | ||
22 | /* The disk structure for the kernel. */ | |
23 | struct gendisk *disk; | |
24 | ||
25 | /* Request tracking. */ | |
26 | struct list_head reqs; | |
27 | ||
28 | mempool_t *pool; | |
29 | ||
0864b79a RR |
30 | /* What host tells us, plus 2 for header & tailer. */ |
31 | unsigned int sg_elems; | |
32 | ||
e467cde2 | 33 | /* Scatterlist: can be too big for stack. */ |
0864b79a | 34 | struct scatterlist sg[/*sg_elems*/]; |
e467cde2 RR |
35 | }; |
36 | ||
37 | struct virtblk_req | |
38 | { | |
39 | struct list_head list; | |
40 | struct request *req; | |
41 | struct virtio_blk_outhdr out_hdr; | |
1cde26f9 | 42 | struct virtio_scsi_inhdr in_hdr; |
cb38fa23 | 43 | u8 status; |
e467cde2 RR |
44 | }; |
45 | ||
18445c4d | 46 | static void blk_done(struct virtqueue *vq) |
e467cde2 RR |
47 | { |
48 | struct virtio_blk *vblk = vq->vdev->priv; | |
49 | struct virtblk_req *vbr; | |
50 | unsigned int len; | |
51 | unsigned long flags; | |
52 | ||
53 | spin_lock_irqsave(&vblk->lock, flags); | |
09ec6b69 | 54 | while ((vbr = virtqueue_get_buf(vblk->vq, &len)) != NULL) { |
8316982a | 55 | int error; |
1cde26f9 | 56 | |
cb38fa23 | 57 | switch (vbr->status) { |
e467cde2 | 58 | case VIRTIO_BLK_S_OK: |
8316982a | 59 | error = 0; |
e467cde2 RR |
60 | break; |
61 | case VIRTIO_BLK_S_UNSUPP: | |
8316982a | 62 | error = -ENOTTY; |
e467cde2 RR |
63 | break; |
64 | default: | |
8316982a | 65 | error = -EIO; |
e467cde2 RR |
66 | break; |
67 | } | |
68 | ||
33659ebb CH |
69 | switch (vbr->req->cmd_type) { |
70 | case REQ_TYPE_BLOCK_PC: | |
1cde26f9 HR |
71 | vbr->req->resid_len = vbr->in_hdr.residual; |
72 | vbr->req->sense_len = vbr->in_hdr.sense_len; | |
73 | vbr->req->errors = vbr->in_hdr.errors; | |
33659ebb CH |
74 | break; |
75 | case REQ_TYPE_SPECIAL: | |
4cb2ea28 | 76 | vbr->req->errors = (error != 0); |
33659ebb | 77 | break; |
15fa6e81 JA |
78 | default: |
79 | break; | |
33659ebb | 80 | } |
1cde26f9 | 81 | |
40cbbb78 | 82 | __blk_end_request_all(vbr->req, error); |
e467cde2 RR |
83 | list_del(&vbr->list); |
84 | mempool_free(vbr, vblk->pool); | |
85 | } | |
86 | /* In case queue is stopped waiting for more buffers. */ | |
87 | blk_start_queue(vblk->disk->queue); | |
88 | spin_unlock_irqrestore(&vblk->lock, flags); | |
e467cde2 RR |
89 | } |
90 | ||
91 | static bool do_req(struct request_queue *q, struct virtio_blk *vblk, | |
92 | struct request *req) | |
93 | { | |
1cde26f9 | 94 | unsigned long num, out = 0, in = 0; |
e467cde2 RR |
95 | struct virtblk_req *vbr; |
96 | ||
97 | vbr = mempool_alloc(vblk->pool, GFP_ATOMIC); | |
98 | if (!vbr) | |
99 | /* When another request finishes we'll try again. */ | |
100 | return false; | |
101 | ||
102 | vbr->req = req; | |
dd40e456 FT |
103 | |
104 | if (req->cmd_flags & REQ_FLUSH) { | |
105 | vbr->out_hdr.type = VIRTIO_BLK_T_FLUSH; | |
4cb2ea28 | 106 | vbr->out_hdr.sector = 0; |
107 | vbr->out_hdr.ioprio = req_get_ioprio(vbr->req); | |
dd40e456 FT |
108 | } else { |
109 | switch (req->cmd_type) { | |
110 | case REQ_TYPE_FS: | |
111 | vbr->out_hdr.type = 0; | |
112 | vbr->out_hdr.sector = blk_rq_pos(vbr->req); | |
113 | vbr->out_hdr.ioprio = req_get_ioprio(vbr->req); | |
114 | break; | |
115 | case REQ_TYPE_BLOCK_PC: | |
116 | vbr->out_hdr.type = VIRTIO_BLK_T_SCSI_CMD; | |
f1b0ef06 CH |
117 | vbr->out_hdr.sector = 0; |
118 | vbr->out_hdr.ioprio = req_get_ioprio(vbr->req); | |
119 | break; | |
dd40e456 FT |
120 | case REQ_TYPE_SPECIAL: |
121 | vbr->out_hdr.type = VIRTIO_BLK_T_GET_ID; | |
122 | vbr->out_hdr.sector = 0; | |
123 | vbr->out_hdr.ioprio = req_get_ioprio(vbr->req); | |
124 | break; | |
125 | default: | |
126 | /* We don't put anything else in the queue. */ | |
127 | BUG(); | |
f1b0ef06 | 128 | } |
e467cde2 RR |
129 | } |
130 | ||
33659ebb | 131 | if (vbr->req->cmd_flags & REQ_HARDBARRIER) |
e467cde2 RR |
132 | vbr->out_hdr.type |= VIRTIO_BLK_T_BARRIER; |
133 | ||
1cde26f9 | 134 | sg_set_buf(&vblk->sg[out++], &vbr->out_hdr, sizeof(vbr->out_hdr)); |
e467cde2 | 135 | |
1cde26f9 HR |
136 | /* |
137 | * If this is a packet command we need a couple of additional headers. | |
138 | * Behind the normal outhdr we put a segment with the scsi command | |
139 | * block, and before the normal inhdr we put the sense data and the | |
140 | * inhdr with additional status information before the normal inhdr. | |
141 | */ | |
33659ebb | 142 | if (vbr->req->cmd_type == REQ_TYPE_BLOCK_PC) |
1cde26f9 HR |
143 | sg_set_buf(&vblk->sg[out++], vbr->req->cmd, vbr->req->cmd_len); |
144 | ||
145 | num = blk_rq_map_sg(q, vbr->req, vblk->sg + out); | |
146 | ||
33659ebb | 147 | if (vbr->req->cmd_type == REQ_TYPE_BLOCK_PC) { |
1cde26f9 HR |
148 | sg_set_buf(&vblk->sg[num + out + in++], vbr->req->sense, 96); |
149 | sg_set_buf(&vblk->sg[num + out + in++], &vbr->in_hdr, | |
150 | sizeof(vbr->in_hdr)); | |
151 | } | |
152 | ||
153 | sg_set_buf(&vblk->sg[num + out + in++], &vbr->status, | |
154 | sizeof(vbr->status)); | |
155 | ||
156 | if (num) { | |
157 | if (rq_data_dir(vbr->req) == WRITE) { | |
158 | vbr->out_hdr.type |= VIRTIO_BLK_T_OUT; | |
159 | out += num; | |
160 | } else { | |
161 | vbr->out_hdr.type |= VIRTIO_BLK_T_IN; | |
162 | in += num; | |
163 | } | |
e467cde2 RR |
164 | } |
165 | ||
09ec6b69 | 166 | if (virtqueue_add_buf(vblk->vq, vblk->sg, out, in, vbr) < 0) { |
e467cde2 RR |
167 | mempool_free(vbr, vblk->pool); |
168 | return false; | |
169 | } | |
170 | ||
171 | list_add_tail(&vbr->list, &vblk->reqs); | |
172 | return true; | |
173 | } | |
174 | ||
175 | static void do_virtblk_request(struct request_queue *q) | |
176 | { | |
6c3b46f7 | 177 | struct virtio_blk *vblk = q->queuedata; |
e467cde2 RR |
178 | struct request *req; |
179 | unsigned int issued = 0; | |
180 | ||
9934c8c0 | 181 | while ((req = blk_peek_request(q)) != NULL) { |
0864b79a | 182 | BUG_ON(req->nr_phys_segments + 2 > vblk->sg_elems); |
e467cde2 RR |
183 | |
184 | /* If this request fails, stop queue and wait for something to | |
185 | finish to restart it. */ | |
186 | if (!do_req(q, vblk, req)) { | |
187 | blk_stop_queue(q); | |
188 | break; | |
189 | } | |
9934c8c0 | 190 | blk_start_request(req); |
e467cde2 RR |
191 | issued++; |
192 | } | |
193 | ||
194 | if (issued) | |
09ec6b69 | 195 | virtqueue_kick(vblk->vq); |
e467cde2 RR |
196 | } |
197 | ||
4cb2ea28 | 198 | /* return id (s/n) string for *disk to *id_str |
199 | */ | |
200 | static int virtblk_get_id(struct gendisk *disk, char *id_str) | |
201 | { | |
202 | struct virtio_blk *vblk = disk->private_data; | |
203 | struct request *req; | |
204 | struct bio *bio; | |
205 | ||
206 | bio = bio_map_kern(vblk->disk->queue, id_str, VIRTIO_BLK_ID_BYTES, | |
207 | GFP_KERNEL); | |
208 | if (IS_ERR(bio)) | |
209 | return PTR_ERR(bio); | |
210 | ||
211 | req = blk_make_request(vblk->disk->queue, bio, GFP_KERNEL); | |
212 | if (IS_ERR(req)) { | |
213 | bio_put(bio); | |
214 | return PTR_ERR(req); | |
215 | } | |
216 | ||
217 | req->cmd_type = REQ_TYPE_SPECIAL; | |
218 | return blk_execute_rq(vblk->disk->queue, vblk->disk, req, false); | |
219 | } | |
220 | ||
8a6cfeb6 | 221 | static int virtblk_locked_ioctl(struct block_device *bdev, fmode_t mode, |
e467cde2 RR |
222 | unsigned cmd, unsigned long data) |
223 | { | |
1cde26f9 HR |
224 | struct gendisk *disk = bdev->bd_disk; |
225 | struct virtio_blk *vblk = disk->private_data; | |
226 | ||
227 | /* | |
228 | * Only allow the generic SCSI ioctls if the host can support it. | |
229 | */ | |
230 | if (!virtio_has_feature(vblk->vdev, VIRTIO_BLK_F_SCSI)) | |
d9ecdea7 | 231 | return -ENOTTY; |
1cde26f9 | 232 | |
3225beab RR |
233 | return scsi_cmd_ioctl(disk->queue, disk, mode, cmd, |
234 | (void __user *)data); | |
e467cde2 RR |
235 | } |
236 | ||
8a6cfeb6 AB |
237 | static int virtblk_ioctl(struct block_device *bdev, fmode_t mode, |
238 | unsigned int cmd, unsigned long param) | |
239 | { | |
240 | int ret; | |
241 | ||
242 | lock_kernel(); | |
243 | ret = virtblk_locked_ioctl(bdev, mode, cmd, param); | |
244 | unlock_kernel(); | |
245 | ||
246 | return ret; | |
247 | } | |
248 | ||
135da0b0 CB |
249 | /* We provide getgeo only to please some old bootloader/partitioning tools */ |
250 | static int virtblk_getgeo(struct block_device *bd, struct hd_geometry *geo) | |
251 | { | |
48e4043d RH |
252 | struct virtio_blk *vblk = bd->bd_disk->private_data; |
253 | struct virtio_blk_geometry vgeo; | |
254 | int err; | |
255 | ||
256 | /* see if the host passed in geometry config */ | |
257 | err = virtio_config_val(vblk->vdev, VIRTIO_BLK_F_GEOMETRY, | |
258 | offsetof(struct virtio_blk_config, geometry), | |
259 | &vgeo); | |
260 | ||
261 | if (!err) { | |
262 | geo->heads = vgeo.heads; | |
263 | geo->sectors = vgeo.sectors; | |
264 | geo->cylinders = vgeo.cylinders; | |
265 | } else { | |
266 | /* some standard values, similar to sd */ | |
267 | geo->heads = 1 << 6; | |
268 | geo->sectors = 1 << 5; | |
269 | geo->cylinders = get_capacity(bd->bd_disk) >> 11; | |
270 | } | |
135da0b0 CB |
271 | return 0; |
272 | } | |
273 | ||
83d5cde4 | 274 | static const struct block_device_operations virtblk_fops = { |
8a6cfeb6 | 275 | .ioctl = virtblk_ioctl, |
135da0b0 CB |
276 | .owner = THIS_MODULE, |
277 | .getgeo = virtblk_getgeo, | |
e467cde2 RR |
278 | }; |
279 | ||
d50ed907 CB |
280 | static int index_to_minor(int index) |
281 | { | |
282 | return index << PART_BITS; | |
283 | } | |
284 | ||
a5eb9e4f RH |
285 | static ssize_t virtblk_serial_show(struct device *dev, |
286 | struct device_attribute *attr, char *buf) | |
287 | { | |
288 | struct gendisk *disk = dev_to_disk(dev); | |
289 | int err; | |
290 | ||
291 | /* sysfs gives us a PAGE_SIZE buffer */ | |
292 | BUILD_BUG_ON(PAGE_SIZE < VIRTIO_BLK_ID_BYTES); | |
293 | ||
294 | buf[VIRTIO_BLK_ID_BYTES] = '\0'; | |
295 | err = virtblk_get_id(disk, buf); | |
296 | if (!err) | |
297 | return strlen(buf); | |
298 | ||
299 | if (err == -EIO) /* Unsupported? Make it empty. */ | |
300 | return 0; | |
301 | ||
302 | return err; | |
303 | } | |
304 | DEVICE_ATTR(serial, S_IRUGO, virtblk_serial_show, NULL); | |
305 | ||
98e94444 | 306 | static int __devinit virtblk_probe(struct virtio_device *vdev) |
e467cde2 RR |
307 | { |
308 | struct virtio_blk *vblk; | |
69740c8b | 309 | struct request_queue *q; |
4f3bf19c | 310 | int err; |
e467cde2 | 311 | u64 cap; |
69740c8b CH |
312 | u32 v, blk_size, sg_elems, opt_io_size; |
313 | u16 min_io_size; | |
314 | u8 physical_block_exp, alignment_offset; | |
e467cde2 | 315 | |
d50ed907 | 316 | if (index_to_minor(index) >= 1 << MINORBITS) |
4f3bf19c CB |
317 | return -ENOSPC; |
318 | ||
0864b79a RR |
319 | /* We need to know how many segments before we allocate. */ |
320 | err = virtio_config_val(vdev, VIRTIO_BLK_F_SEG_MAX, | |
321 | offsetof(struct virtio_blk_config, seg_max), | |
322 | &sg_elems); | |
a5b365a6 CH |
323 | |
324 | /* We need at least one SG element, whatever they say. */ | |
325 | if (err || !sg_elems) | |
0864b79a RR |
326 | sg_elems = 1; |
327 | ||
328 | /* We need an extra sg elements at head and tail. */ | |
329 | sg_elems += 2; | |
330 | vdev->priv = vblk = kmalloc(sizeof(*vblk) + | |
331 | sizeof(vblk->sg[0]) * sg_elems, GFP_KERNEL); | |
e467cde2 RR |
332 | if (!vblk) { |
333 | err = -ENOMEM; | |
334 | goto out; | |
335 | } | |
336 | ||
337 | INIT_LIST_HEAD(&vblk->reqs); | |
338 | spin_lock_init(&vblk->lock); | |
339 | vblk->vdev = vdev; | |
0864b79a RR |
340 | vblk->sg_elems = sg_elems; |
341 | sg_init_table(vblk->sg, vblk->sg_elems); | |
e467cde2 RR |
342 | |
343 | /* We expect one virtqueue, for output. */ | |
d2a7ddda | 344 | vblk->vq = virtio_find_single_vq(vdev, blk_done, "requests"); |
e467cde2 RR |
345 | if (IS_ERR(vblk->vq)) { |
346 | err = PTR_ERR(vblk->vq); | |
347 | goto out_free_vblk; | |
348 | } | |
349 | ||
350 | vblk->pool = mempool_create_kmalloc_pool(1,sizeof(struct virtblk_req)); | |
351 | if (!vblk->pool) { | |
352 | err = -ENOMEM; | |
353 | goto out_free_vq; | |
354 | } | |
355 | ||
e467cde2 | 356 | /* FIXME: How many partitions? How long is a piece of string? */ |
4f3bf19c | 357 | vblk->disk = alloc_disk(1 << PART_BITS); |
e467cde2 RR |
358 | if (!vblk->disk) { |
359 | err = -ENOMEM; | |
4f3bf19c | 360 | goto out_mempool; |
e467cde2 RR |
361 | } |
362 | ||
69740c8b CH |
363 | q = vblk->disk->queue = blk_init_queue(do_virtblk_request, &vblk->lock); |
364 | if (!q) { | |
e467cde2 RR |
365 | err = -ENOMEM; |
366 | goto out_put_disk; | |
367 | } | |
368 | ||
69740c8b | 369 | q->queuedata = vblk; |
7d116b62 | 370 | |
d50ed907 CB |
371 | if (index < 26) { |
372 | sprintf(vblk->disk->disk_name, "vd%c", 'a' + index % 26); | |
373 | } else if (index < (26 + 1) * 26) { | |
374 | sprintf(vblk->disk->disk_name, "vd%c%c", | |
375 | 'a' + index / 26 - 1, 'a' + index % 26); | |
376 | } else { | |
377 | const unsigned int m1 = (index / 26 - 1) / 26 - 1; | |
378 | const unsigned int m2 = (index / 26 - 1) % 26; | |
379 | const unsigned int m3 = index % 26; | |
380 | sprintf(vblk->disk->disk_name, "vd%c%c%c", | |
381 | 'a' + m1, 'a' + m2, 'a' + m3); | |
382 | } | |
383 | ||
e467cde2 | 384 | vblk->disk->major = major; |
d50ed907 | 385 | vblk->disk->first_minor = index_to_minor(index); |
e467cde2 RR |
386 | vblk->disk->private_data = vblk; |
387 | vblk->disk->fops = &virtblk_fops; | |
c4839346 | 388 | vblk->disk->driverfs_dev = &vdev->dev; |
d50ed907 | 389 | index++; |
4f3bf19c | 390 | |
4913efe4 TH |
391 | /* |
392 | * If the FLUSH feature is supported we do have support for | |
393 | * flushing a volatile write cache on the host. Use that to | |
394 | * implement write barrier support; otherwise, we must assume | |
395 | * that the host does not perform any kind of volatile write | |
396 | * caching. | |
397 | */ | |
398 | if (virtio_has_feature(vdev, VIRTIO_BLK_F_FLUSH)) | |
399 | blk_queue_flush(q, REQ_FLUSH); | |
e467cde2 | 400 | |
3ef53609 CB |
401 | /* If disk is read-only in the host, the guest should obey */ |
402 | if (virtio_has_feature(vdev, VIRTIO_BLK_F_RO)) | |
403 | set_disk_ro(vblk->disk, 1); | |
404 | ||
a586d4f6 | 405 | /* Host must always specify the capacity. */ |
72e61eb4 RR |
406 | vdev->config->get(vdev, offsetof(struct virtio_blk_config, capacity), |
407 | &cap, sizeof(cap)); | |
e467cde2 RR |
408 | |
409 | /* If capacity is too big, truncate with warning. */ | |
410 | if ((sector_t)cap != cap) { | |
411 | dev_warn(&vdev->dev, "Capacity %llu too large: truncating\n", | |
412 | (unsigned long long)cap); | |
413 | cap = (sector_t)-1; | |
414 | } | |
415 | set_capacity(vblk->disk, cap); | |
416 | ||
0864b79a | 417 | /* We can handle whatever the host told us to handle. */ |
ee714f2d | 418 | blk_queue_max_segments(q, vblk->sg_elems-2); |
0864b79a | 419 | |
4eff3cae | 420 | /* No need to bounce any requests */ |
69740c8b | 421 | blk_queue_bounce_limit(q, BLK_BOUNCE_ANY); |
4eff3cae | 422 | |
4b7f7e20 | 423 | /* No real sector limit. */ |
ee714f2d | 424 | blk_queue_max_hw_sectors(q, -1U); |
4b7f7e20 | 425 | |
a586d4f6 RR |
426 | /* Host can optionally specify maximum segment size and number of |
427 | * segments. */ | |
428 | err = virtio_config_val(vdev, VIRTIO_BLK_F_SIZE_MAX, | |
429 | offsetof(struct virtio_blk_config, size_max), | |
430 | &v); | |
e467cde2 | 431 | if (!err) |
69740c8b | 432 | blk_queue_max_segment_size(q, v); |
4b7f7e20 | 433 | else |
69740c8b | 434 | blk_queue_max_segment_size(q, -1U); |
e467cde2 | 435 | |
066f4d82 CB |
436 | /* Host can optionally specify the block size of the device */ |
437 | err = virtio_config_val(vdev, VIRTIO_BLK_F_BLK_SIZE, | |
438 | offsetof(struct virtio_blk_config, blk_size), | |
439 | &blk_size); | |
440 | if (!err) | |
69740c8b CH |
441 | blk_queue_logical_block_size(q, blk_size); |
442 | else | |
443 | blk_size = queue_logical_block_size(q); | |
444 | ||
445 | /* Use topology information if available */ | |
446 | err = virtio_config_val(vdev, VIRTIO_BLK_F_TOPOLOGY, | |
447 | offsetof(struct virtio_blk_config, physical_block_exp), | |
448 | &physical_block_exp); | |
449 | if (!err && physical_block_exp) | |
450 | blk_queue_physical_block_size(q, | |
451 | blk_size * (1 << physical_block_exp)); | |
452 | ||
453 | err = virtio_config_val(vdev, VIRTIO_BLK_F_TOPOLOGY, | |
454 | offsetof(struct virtio_blk_config, alignment_offset), | |
455 | &alignment_offset); | |
456 | if (!err && alignment_offset) | |
457 | blk_queue_alignment_offset(q, blk_size * alignment_offset); | |
458 | ||
459 | err = virtio_config_val(vdev, VIRTIO_BLK_F_TOPOLOGY, | |
460 | offsetof(struct virtio_blk_config, min_io_size), | |
461 | &min_io_size); | |
462 | if (!err && min_io_size) | |
463 | blk_queue_io_min(q, blk_size * min_io_size); | |
464 | ||
465 | err = virtio_config_val(vdev, VIRTIO_BLK_F_TOPOLOGY, | |
466 | offsetof(struct virtio_blk_config, opt_io_size), | |
467 | &opt_io_size); | |
468 | if (!err && opt_io_size) | |
469 | blk_queue_io_opt(q, blk_size * opt_io_size); | |
470 | ||
066f4d82 | 471 | |
e467cde2 | 472 | add_disk(vblk->disk); |
a5eb9e4f RH |
473 | err = device_create_file(disk_to_dev(vblk->disk), &dev_attr_serial); |
474 | if (err) | |
475 | goto out_del_disk; | |
476 | ||
e467cde2 RR |
477 | return 0; |
478 | ||
a5eb9e4f RH |
479 | out_del_disk: |
480 | del_gendisk(vblk->disk); | |
481 | blk_cleanup_queue(vblk->disk->queue); | |
e467cde2 RR |
482 | out_put_disk: |
483 | put_disk(vblk->disk); | |
e467cde2 RR |
484 | out_mempool: |
485 | mempool_destroy(vblk->pool); | |
486 | out_free_vq: | |
d2a7ddda | 487 | vdev->config->del_vqs(vdev); |
e467cde2 RR |
488 | out_free_vblk: |
489 | kfree(vblk); | |
490 | out: | |
491 | return err; | |
492 | } | |
493 | ||
98e94444 | 494 | static void __devexit virtblk_remove(struct virtio_device *vdev) |
e467cde2 RR |
495 | { |
496 | struct virtio_blk *vblk = vdev->priv; | |
e467cde2 | 497 | |
6e5aa7ef | 498 | /* Nothing should be pending. */ |
e467cde2 | 499 | BUG_ON(!list_empty(&vblk->reqs)); |
6e5aa7ef RR |
500 | |
501 | /* Stop all the virtqueues. */ | |
502 | vdev->config->reset(vdev); | |
503 | ||
ac9d463a | 504 | del_gendisk(vblk->disk); |
e467cde2 RR |
505 | blk_cleanup_queue(vblk->disk->queue); |
506 | put_disk(vblk->disk); | |
e467cde2 | 507 | mempool_destroy(vblk->pool); |
d2a7ddda | 508 | vdev->config->del_vqs(vdev); |
e467cde2 RR |
509 | kfree(vblk); |
510 | } | |
511 | ||
47483e25 | 512 | static const struct virtio_device_id id_table[] = { |
e467cde2 RR |
513 | { VIRTIO_ID_BLOCK, VIRTIO_DEV_ANY_ID }, |
514 | { 0 }, | |
515 | }; | |
516 | ||
c45a6816 RR |
517 | static unsigned int features[] = { |
518 | VIRTIO_BLK_F_BARRIER, VIRTIO_BLK_F_SEG_MAX, VIRTIO_BLK_F_SIZE_MAX, | |
066f4d82 | 519 | VIRTIO_BLK_F_GEOMETRY, VIRTIO_BLK_F_RO, VIRTIO_BLK_F_BLK_SIZE, |
69740c8b | 520 | VIRTIO_BLK_F_SCSI, VIRTIO_BLK_F_FLUSH, VIRTIO_BLK_F_TOPOLOGY |
c45a6816 RR |
521 | }; |
522 | ||
4fbfff76 RM |
523 | /* |
524 | * virtio_blk causes spurious section mismatch warning by | |
525 | * simultaneously referring to a __devinit and a __devexit function. | |
526 | * Use __refdata to avoid this warning. | |
527 | */ | |
528 | static struct virtio_driver __refdata virtio_blk = { | |
c45a6816 RR |
529 | .feature_table = features, |
530 | .feature_table_size = ARRAY_SIZE(features), | |
e467cde2 RR |
531 | .driver.name = KBUILD_MODNAME, |
532 | .driver.owner = THIS_MODULE, | |
533 | .id_table = id_table, | |
534 | .probe = virtblk_probe, | |
535 | .remove = __devexit_p(virtblk_remove), | |
536 | }; | |
537 | ||
538 | static int __init init(void) | |
539 | { | |
4f3bf19c CB |
540 | major = register_blkdev(0, "virtblk"); |
541 | if (major < 0) | |
542 | return major; | |
e467cde2 RR |
543 | return register_virtio_driver(&virtio_blk); |
544 | } | |
545 | ||
546 | static void __exit fini(void) | |
547 | { | |
4f3bf19c | 548 | unregister_blkdev(major, "virtblk"); |
e467cde2 RR |
549 | unregister_virtio_driver(&virtio_blk); |
550 | } | |
551 | module_init(init); | |
552 | module_exit(fini); | |
553 | ||
554 | MODULE_DEVICE_TABLE(virtio, id_table); | |
555 | MODULE_DESCRIPTION("Virtio block driver"); | |
556 | MODULE_LICENSE("GPL"); |