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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; | |
e4c4776d | 205 | int err; |
4cb2ea28 | 206 | |
207 | bio = bio_map_kern(vblk->disk->queue, id_str, VIRTIO_BLK_ID_BYTES, | |
208 | GFP_KERNEL); | |
209 | if (IS_ERR(bio)) | |
210 | return PTR_ERR(bio); | |
211 | ||
212 | req = blk_make_request(vblk->disk->queue, bio, GFP_KERNEL); | |
213 | if (IS_ERR(req)) { | |
214 | bio_put(bio); | |
215 | return PTR_ERR(req); | |
216 | } | |
217 | ||
218 | req->cmd_type = REQ_TYPE_SPECIAL; | |
e4c4776d MS |
219 | err = blk_execute_rq(vblk->disk->queue, vblk->disk, req, false); |
220 | blk_put_request(req); | |
221 | ||
222 | return err; | |
4cb2ea28 | 223 | } |
224 | ||
8a6cfeb6 | 225 | static int virtblk_locked_ioctl(struct block_device *bdev, fmode_t mode, |
e467cde2 RR |
226 | unsigned cmd, unsigned long data) |
227 | { | |
1cde26f9 HR |
228 | struct gendisk *disk = bdev->bd_disk; |
229 | struct virtio_blk *vblk = disk->private_data; | |
230 | ||
231 | /* | |
232 | * Only allow the generic SCSI ioctls if the host can support it. | |
233 | */ | |
234 | if (!virtio_has_feature(vblk->vdev, VIRTIO_BLK_F_SCSI)) | |
d9ecdea7 | 235 | return -ENOTTY; |
1cde26f9 | 236 | |
3225beab RR |
237 | return scsi_cmd_ioctl(disk->queue, disk, mode, cmd, |
238 | (void __user *)data); | |
e467cde2 RR |
239 | } |
240 | ||
8a6cfeb6 AB |
241 | static int virtblk_ioctl(struct block_device *bdev, fmode_t mode, |
242 | unsigned int cmd, unsigned long param) | |
243 | { | |
244 | int ret; | |
245 | ||
246 | lock_kernel(); | |
247 | ret = virtblk_locked_ioctl(bdev, mode, cmd, param); | |
248 | unlock_kernel(); | |
249 | ||
250 | return ret; | |
251 | } | |
252 | ||
135da0b0 CB |
253 | /* We provide getgeo only to please some old bootloader/partitioning tools */ |
254 | static int virtblk_getgeo(struct block_device *bd, struct hd_geometry *geo) | |
255 | { | |
48e4043d RH |
256 | struct virtio_blk *vblk = bd->bd_disk->private_data; |
257 | struct virtio_blk_geometry vgeo; | |
258 | int err; | |
259 | ||
260 | /* see if the host passed in geometry config */ | |
261 | err = virtio_config_val(vblk->vdev, VIRTIO_BLK_F_GEOMETRY, | |
262 | offsetof(struct virtio_blk_config, geometry), | |
263 | &vgeo); | |
264 | ||
265 | if (!err) { | |
266 | geo->heads = vgeo.heads; | |
267 | geo->sectors = vgeo.sectors; | |
268 | geo->cylinders = vgeo.cylinders; | |
269 | } else { | |
270 | /* some standard values, similar to sd */ | |
271 | geo->heads = 1 << 6; | |
272 | geo->sectors = 1 << 5; | |
273 | geo->cylinders = get_capacity(bd->bd_disk) >> 11; | |
274 | } | |
135da0b0 CB |
275 | return 0; |
276 | } | |
277 | ||
83d5cde4 | 278 | static const struct block_device_operations virtblk_fops = { |
8a6cfeb6 | 279 | .ioctl = virtblk_ioctl, |
135da0b0 CB |
280 | .owner = THIS_MODULE, |
281 | .getgeo = virtblk_getgeo, | |
e467cde2 RR |
282 | }; |
283 | ||
d50ed907 CB |
284 | static int index_to_minor(int index) |
285 | { | |
286 | return index << PART_BITS; | |
287 | } | |
288 | ||
a5eb9e4f RH |
289 | static ssize_t virtblk_serial_show(struct device *dev, |
290 | struct device_attribute *attr, char *buf) | |
291 | { | |
292 | struct gendisk *disk = dev_to_disk(dev); | |
293 | int err; | |
294 | ||
295 | /* sysfs gives us a PAGE_SIZE buffer */ | |
296 | BUILD_BUG_ON(PAGE_SIZE < VIRTIO_BLK_ID_BYTES); | |
297 | ||
298 | buf[VIRTIO_BLK_ID_BYTES] = '\0'; | |
299 | err = virtblk_get_id(disk, buf); | |
300 | if (!err) | |
301 | return strlen(buf); | |
302 | ||
303 | if (err == -EIO) /* Unsupported? Make it empty. */ | |
304 | return 0; | |
305 | ||
306 | return err; | |
307 | } | |
308 | DEVICE_ATTR(serial, S_IRUGO, virtblk_serial_show, NULL); | |
309 | ||
98e94444 | 310 | static int __devinit virtblk_probe(struct virtio_device *vdev) |
e467cde2 RR |
311 | { |
312 | struct virtio_blk *vblk; | |
69740c8b | 313 | struct request_queue *q; |
4f3bf19c | 314 | int err; |
e467cde2 | 315 | u64 cap; |
69740c8b CH |
316 | u32 v, blk_size, sg_elems, opt_io_size; |
317 | u16 min_io_size; | |
318 | u8 physical_block_exp, alignment_offset; | |
e467cde2 | 319 | |
d50ed907 | 320 | if (index_to_minor(index) >= 1 << MINORBITS) |
4f3bf19c CB |
321 | return -ENOSPC; |
322 | ||
0864b79a RR |
323 | /* We need to know how many segments before we allocate. */ |
324 | err = virtio_config_val(vdev, VIRTIO_BLK_F_SEG_MAX, | |
325 | offsetof(struct virtio_blk_config, seg_max), | |
326 | &sg_elems); | |
a5b365a6 CH |
327 | |
328 | /* We need at least one SG element, whatever they say. */ | |
329 | if (err || !sg_elems) | |
0864b79a RR |
330 | sg_elems = 1; |
331 | ||
332 | /* We need an extra sg elements at head and tail. */ | |
333 | sg_elems += 2; | |
334 | vdev->priv = vblk = kmalloc(sizeof(*vblk) + | |
335 | sizeof(vblk->sg[0]) * sg_elems, GFP_KERNEL); | |
e467cde2 RR |
336 | if (!vblk) { |
337 | err = -ENOMEM; | |
338 | goto out; | |
339 | } | |
340 | ||
341 | INIT_LIST_HEAD(&vblk->reqs); | |
342 | spin_lock_init(&vblk->lock); | |
343 | vblk->vdev = vdev; | |
0864b79a RR |
344 | vblk->sg_elems = sg_elems; |
345 | sg_init_table(vblk->sg, vblk->sg_elems); | |
e467cde2 RR |
346 | |
347 | /* We expect one virtqueue, for output. */ | |
d2a7ddda | 348 | vblk->vq = virtio_find_single_vq(vdev, blk_done, "requests"); |
e467cde2 RR |
349 | if (IS_ERR(vblk->vq)) { |
350 | err = PTR_ERR(vblk->vq); | |
351 | goto out_free_vblk; | |
352 | } | |
353 | ||
354 | vblk->pool = mempool_create_kmalloc_pool(1,sizeof(struct virtblk_req)); | |
355 | if (!vblk->pool) { | |
356 | err = -ENOMEM; | |
357 | goto out_free_vq; | |
358 | } | |
359 | ||
e467cde2 | 360 | /* FIXME: How many partitions? How long is a piece of string? */ |
4f3bf19c | 361 | vblk->disk = alloc_disk(1 << PART_BITS); |
e467cde2 RR |
362 | if (!vblk->disk) { |
363 | err = -ENOMEM; | |
4f3bf19c | 364 | goto out_mempool; |
e467cde2 RR |
365 | } |
366 | ||
69740c8b CH |
367 | q = vblk->disk->queue = blk_init_queue(do_virtblk_request, &vblk->lock); |
368 | if (!q) { | |
e467cde2 RR |
369 | err = -ENOMEM; |
370 | goto out_put_disk; | |
371 | } | |
372 | ||
69740c8b | 373 | q->queuedata = vblk; |
7d116b62 | 374 | |
d50ed907 CB |
375 | if (index < 26) { |
376 | sprintf(vblk->disk->disk_name, "vd%c", 'a' + index % 26); | |
377 | } else if (index < (26 + 1) * 26) { | |
378 | sprintf(vblk->disk->disk_name, "vd%c%c", | |
379 | 'a' + index / 26 - 1, 'a' + index % 26); | |
380 | } else { | |
381 | const unsigned int m1 = (index / 26 - 1) / 26 - 1; | |
382 | const unsigned int m2 = (index / 26 - 1) % 26; | |
383 | const unsigned int m3 = index % 26; | |
384 | sprintf(vblk->disk->disk_name, "vd%c%c%c", | |
385 | 'a' + m1, 'a' + m2, 'a' + m3); | |
386 | } | |
387 | ||
e467cde2 | 388 | vblk->disk->major = major; |
d50ed907 | 389 | vblk->disk->first_minor = index_to_minor(index); |
e467cde2 RR |
390 | vblk->disk->private_data = vblk; |
391 | vblk->disk->fops = &virtblk_fops; | |
c4839346 | 392 | vblk->disk->driverfs_dev = &vdev->dev; |
d50ed907 | 393 | index++; |
4f3bf19c | 394 | |
10bc310c CH |
395 | if (virtio_has_feature(vdev, VIRTIO_BLK_F_FLUSH)) { |
396 | /* | |
397 | * If the FLUSH feature is supported we do have support for | |
398 | * flushing a volatile write cache on the host. Use that | |
399 | * to implement write barrier support. | |
400 | */ | |
00fff265 | 401 | blk_queue_ordered(q, QUEUE_ORDERED_DRAIN_FLUSH); |
10bc310c CH |
402 | } else if (virtio_has_feature(vdev, VIRTIO_BLK_F_BARRIER)) { |
403 | /* | |
404 | * If the BARRIER feature is supported the host expects us | |
405 | * to order request by tags. This implies there is not | |
406 | * volatile write cache on the host, and that the host | |
407 | * never re-orders outstanding I/O. This feature is not | |
408 | * useful for real life scenarious and deprecated. | |
409 | */ | |
00fff265 | 410 | blk_queue_ordered(q, QUEUE_ORDERED_TAG); |
10bc310c CH |
411 | } else { |
412 | /* | |
413 | * If the FLUSH feature is not supported we must assume that | |
414 | * the host does not perform any kind of volatile write | |
415 | * caching. We still need to drain the queue to provider | |
416 | * proper barrier semantics. | |
417 | */ | |
2f9e825d | 418 | blk_queue_ordered(q, QUEUE_ORDERED_DRAIN); |
10bc310c | 419 | } |
e467cde2 | 420 | |
3ef53609 CB |
421 | /* If disk is read-only in the host, the guest should obey */ |
422 | if (virtio_has_feature(vdev, VIRTIO_BLK_F_RO)) | |
423 | set_disk_ro(vblk->disk, 1); | |
424 | ||
a586d4f6 | 425 | /* Host must always specify the capacity. */ |
72e61eb4 RR |
426 | vdev->config->get(vdev, offsetof(struct virtio_blk_config, capacity), |
427 | &cap, sizeof(cap)); | |
e467cde2 RR |
428 | |
429 | /* If capacity is too big, truncate with warning. */ | |
430 | if ((sector_t)cap != cap) { | |
431 | dev_warn(&vdev->dev, "Capacity %llu too large: truncating\n", | |
432 | (unsigned long long)cap); | |
433 | cap = (sector_t)-1; | |
434 | } | |
435 | set_capacity(vblk->disk, cap); | |
436 | ||
0864b79a | 437 | /* We can handle whatever the host told us to handle. */ |
ee714f2d | 438 | blk_queue_max_segments(q, vblk->sg_elems-2); |
0864b79a | 439 | |
4eff3cae | 440 | /* No need to bounce any requests */ |
69740c8b | 441 | blk_queue_bounce_limit(q, BLK_BOUNCE_ANY); |
4eff3cae | 442 | |
4b7f7e20 | 443 | /* No real sector limit. */ |
ee714f2d | 444 | blk_queue_max_hw_sectors(q, -1U); |
4b7f7e20 | 445 | |
a586d4f6 RR |
446 | /* Host can optionally specify maximum segment size and number of |
447 | * segments. */ | |
448 | err = virtio_config_val(vdev, VIRTIO_BLK_F_SIZE_MAX, | |
449 | offsetof(struct virtio_blk_config, size_max), | |
450 | &v); | |
e467cde2 | 451 | if (!err) |
69740c8b | 452 | blk_queue_max_segment_size(q, v); |
4b7f7e20 | 453 | else |
69740c8b | 454 | blk_queue_max_segment_size(q, -1U); |
e467cde2 | 455 | |
066f4d82 CB |
456 | /* Host can optionally specify the block size of the device */ |
457 | err = virtio_config_val(vdev, VIRTIO_BLK_F_BLK_SIZE, | |
458 | offsetof(struct virtio_blk_config, blk_size), | |
459 | &blk_size); | |
460 | if (!err) | |
69740c8b CH |
461 | blk_queue_logical_block_size(q, blk_size); |
462 | else | |
463 | blk_size = queue_logical_block_size(q); | |
464 | ||
465 | /* Use topology information if available */ | |
466 | err = virtio_config_val(vdev, VIRTIO_BLK_F_TOPOLOGY, | |
467 | offsetof(struct virtio_blk_config, physical_block_exp), | |
468 | &physical_block_exp); | |
469 | if (!err && physical_block_exp) | |
470 | blk_queue_physical_block_size(q, | |
471 | blk_size * (1 << physical_block_exp)); | |
472 | ||
473 | err = virtio_config_val(vdev, VIRTIO_BLK_F_TOPOLOGY, | |
474 | offsetof(struct virtio_blk_config, alignment_offset), | |
475 | &alignment_offset); | |
476 | if (!err && alignment_offset) | |
477 | blk_queue_alignment_offset(q, blk_size * alignment_offset); | |
478 | ||
479 | err = virtio_config_val(vdev, VIRTIO_BLK_F_TOPOLOGY, | |
480 | offsetof(struct virtio_blk_config, min_io_size), | |
481 | &min_io_size); | |
482 | if (!err && min_io_size) | |
483 | blk_queue_io_min(q, blk_size * min_io_size); | |
484 | ||
485 | err = virtio_config_val(vdev, VIRTIO_BLK_F_TOPOLOGY, | |
486 | offsetof(struct virtio_blk_config, opt_io_size), | |
487 | &opt_io_size); | |
488 | if (!err && opt_io_size) | |
489 | blk_queue_io_opt(q, blk_size * opt_io_size); | |
490 | ||
066f4d82 | 491 | |
e467cde2 | 492 | add_disk(vblk->disk); |
a5eb9e4f RH |
493 | err = device_create_file(disk_to_dev(vblk->disk), &dev_attr_serial); |
494 | if (err) | |
495 | goto out_del_disk; | |
496 | ||
e467cde2 RR |
497 | return 0; |
498 | ||
a5eb9e4f RH |
499 | out_del_disk: |
500 | del_gendisk(vblk->disk); | |
501 | blk_cleanup_queue(vblk->disk->queue); | |
e467cde2 RR |
502 | out_put_disk: |
503 | put_disk(vblk->disk); | |
e467cde2 RR |
504 | out_mempool: |
505 | mempool_destroy(vblk->pool); | |
506 | out_free_vq: | |
d2a7ddda | 507 | vdev->config->del_vqs(vdev); |
e467cde2 RR |
508 | out_free_vblk: |
509 | kfree(vblk); | |
510 | out: | |
511 | return err; | |
512 | } | |
513 | ||
98e94444 | 514 | static void __devexit virtblk_remove(struct virtio_device *vdev) |
e467cde2 RR |
515 | { |
516 | struct virtio_blk *vblk = vdev->priv; | |
e467cde2 | 517 | |
6e5aa7ef | 518 | /* Nothing should be pending. */ |
e467cde2 | 519 | BUG_ON(!list_empty(&vblk->reqs)); |
6e5aa7ef RR |
520 | |
521 | /* Stop all the virtqueues. */ | |
522 | vdev->config->reset(vdev); | |
523 | ||
ac9d463a | 524 | del_gendisk(vblk->disk); |
e467cde2 RR |
525 | blk_cleanup_queue(vblk->disk->queue); |
526 | put_disk(vblk->disk); | |
e467cde2 | 527 | mempool_destroy(vblk->pool); |
d2a7ddda | 528 | vdev->config->del_vqs(vdev); |
e467cde2 RR |
529 | kfree(vblk); |
530 | } | |
531 | ||
47483e25 | 532 | static const struct virtio_device_id id_table[] = { |
e467cde2 RR |
533 | { VIRTIO_ID_BLOCK, VIRTIO_DEV_ANY_ID }, |
534 | { 0 }, | |
535 | }; | |
536 | ||
c45a6816 RR |
537 | static unsigned int features[] = { |
538 | VIRTIO_BLK_F_BARRIER, VIRTIO_BLK_F_SEG_MAX, VIRTIO_BLK_F_SIZE_MAX, | |
066f4d82 | 539 | VIRTIO_BLK_F_GEOMETRY, VIRTIO_BLK_F_RO, VIRTIO_BLK_F_BLK_SIZE, |
69740c8b | 540 | VIRTIO_BLK_F_SCSI, VIRTIO_BLK_F_FLUSH, VIRTIO_BLK_F_TOPOLOGY |
c45a6816 RR |
541 | }; |
542 | ||
4fbfff76 RM |
543 | /* |
544 | * virtio_blk causes spurious section mismatch warning by | |
545 | * simultaneously referring to a __devinit and a __devexit function. | |
546 | * Use __refdata to avoid this warning. | |
547 | */ | |
548 | static struct virtio_driver __refdata virtio_blk = { | |
c45a6816 RR |
549 | .feature_table = features, |
550 | .feature_table_size = ARRAY_SIZE(features), | |
e467cde2 RR |
551 | .driver.name = KBUILD_MODNAME, |
552 | .driver.owner = THIS_MODULE, | |
553 | .id_table = id_table, | |
554 | .probe = virtblk_probe, | |
555 | .remove = __devexit_p(virtblk_remove), | |
556 | }; | |
557 | ||
558 | static int __init init(void) | |
559 | { | |
4f3bf19c CB |
560 | major = register_blkdev(0, "virtblk"); |
561 | if (major < 0) | |
562 | return major; | |
e467cde2 RR |
563 | return register_virtio_driver(&virtio_blk); |
564 | } | |
565 | ||
566 | static void __exit fini(void) | |
567 | { | |
4f3bf19c | 568 | unregister_blkdev(major, "virtblk"); |
e467cde2 RR |
569 | unregister_virtio_driver(&virtio_blk); |
570 | } | |
571 | module_init(init); | |
572 | module_exit(fini); | |
573 | ||
574 | MODULE_DEVICE_TABLE(virtio, id_table); | |
575 | MODULE_DESCRIPTION("Virtio block driver"); | |
576 | MODULE_LICENSE("GPL"); |