Commit | Line | Data |
---|---|---|
e467cde2 RR |
1 | //#define DEBUG |
2 | #include <linux/spinlock.h> | |
5a0e3ad6 | 3 | #include <linux/slab.h> |
e467cde2 RR |
4 | #include <linux/blkdev.h> |
5 | #include <linux/hdreg.h> | |
6 | #include <linux/virtio.h> | |
7 | #include <linux/virtio_blk.h> | |
3d1266c7 | 8 | #include <linux/scatterlist.h> |
7a7c924c | 9 | #include <linux/string_helpers.h> |
6917f83f | 10 | #include <scsi/scsi_cmnd.h> |
3d1266c7 | 11 | |
4f3bf19c | 12 | #define PART_BITS 4 |
e467cde2 | 13 | |
d50ed907 | 14 | static int major, index; |
7a7c924c | 15 | struct workqueue_struct *virtblk_wq; |
4f3bf19c | 16 | |
e467cde2 RR |
17 | struct virtio_blk |
18 | { | |
19 | spinlock_t lock; | |
20 | ||
21 | struct virtio_device *vdev; | |
22 | struct virtqueue *vq; | |
23 | ||
24 | /* The disk structure for the kernel. */ | |
25 | struct gendisk *disk; | |
26 | ||
27 | /* Request tracking. */ | |
28 | struct list_head reqs; | |
29 | ||
30 | mempool_t *pool; | |
31 | ||
7a7c924c CH |
32 | /* Process context for config space updates */ |
33 | struct work_struct config_work; | |
34 | ||
0864b79a RR |
35 | /* What host tells us, plus 2 for header & tailer. */ |
36 | unsigned int sg_elems; | |
37 | ||
e467cde2 | 38 | /* Scatterlist: can be too big for stack. */ |
0864b79a | 39 | struct scatterlist sg[/*sg_elems*/]; |
e467cde2 RR |
40 | }; |
41 | ||
42 | struct virtblk_req | |
43 | { | |
44 | struct list_head list; | |
45 | struct request *req; | |
46 | struct virtio_blk_outhdr out_hdr; | |
1cde26f9 | 47 | struct virtio_scsi_inhdr in_hdr; |
cb38fa23 | 48 | u8 status; |
e467cde2 RR |
49 | }; |
50 | ||
18445c4d | 51 | static void blk_done(struct virtqueue *vq) |
e467cde2 RR |
52 | { |
53 | struct virtio_blk *vblk = vq->vdev->priv; | |
54 | struct virtblk_req *vbr; | |
55 | unsigned int len; | |
56 | unsigned long flags; | |
57 | ||
58 | spin_lock_irqsave(&vblk->lock, flags); | |
09ec6b69 | 59 | while ((vbr = virtqueue_get_buf(vblk->vq, &len)) != NULL) { |
8316982a | 60 | int error; |
1cde26f9 | 61 | |
cb38fa23 | 62 | switch (vbr->status) { |
e467cde2 | 63 | case VIRTIO_BLK_S_OK: |
8316982a | 64 | error = 0; |
e467cde2 RR |
65 | break; |
66 | case VIRTIO_BLK_S_UNSUPP: | |
8316982a | 67 | error = -ENOTTY; |
e467cde2 RR |
68 | break; |
69 | default: | |
8316982a | 70 | error = -EIO; |
e467cde2 RR |
71 | break; |
72 | } | |
73 | ||
33659ebb CH |
74 | switch (vbr->req->cmd_type) { |
75 | case REQ_TYPE_BLOCK_PC: | |
1cde26f9 HR |
76 | vbr->req->resid_len = vbr->in_hdr.residual; |
77 | vbr->req->sense_len = vbr->in_hdr.sense_len; | |
78 | vbr->req->errors = vbr->in_hdr.errors; | |
33659ebb CH |
79 | break; |
80 | case REQ_TYPE_SPECIAL: | |
4cb2ea28 | 81 | vbr->req->errors = (error != 0); |
33659ebb | 82 | break; |
15fa6e81 JA |
83 | default: |
84 | break; | |
33659ebb | 85 | } |
1cde26f9 | 86 | |
40cbbb78 | 87 | __blk_end_request_all(vbr->req, error); |
e467cde2 RR |
88 | list_del(&vbr->list); |
89 | mempool_free(vbr, vblk->pool); | |
90 | } | |
91 | /* In case queue is stopped waiting for more buffers. */ | |
92 | blk_start_queue(vblk->disk->queue); | |
93 | spin_unlock_irqrestore(&vblk->lock, flags); | |
e467cde2 RR |
94 | } |
95 | ||
96 | static bool do_req(struct request_queue *q, struct virtio_blk *vblk, | |
97 | struct request *req) | |
98 | { | |
1cde26f9 | 99 | unsigned long num, out = 0, in = 0; |
e467cde2 RR |
100 | struct virtblk_req *vbr; |
101 | ||
102 | vbr = mempool_alloc(vblk->pool, GFP_ATOMIC); | |
103 | if (!vbr) | |
104 | /* When another request finishes we'll try again. */ | |
105 | return false; | |
106 | ||
107 | vbr->req = req; | |
dd40e456 FT |
108 | |
109 | if (req->cmd_flags & REQ_FLUSH) { | |
110 | vbr->out_hdr.type = VIRTIO_BLK_T_FLUSH; | |
4cb2ea28 | 111 | vbr->out_hdr.sector = 0; |
112 | vbr->out_hdr.ioprio = req_get_ioprio(vbr->req); | |
dd40e456 FT |
113 | } else { |
114 | switch (req->cmd_type) { | |
115 | case REQ_TYPE_FS: | |
116 | vbr->out_hdr.type = 0; | |
117 | vbr->out_hdr.sector = blk_rq_pos(vbr->req); | |
118 | vbr->out_hdr.ioprio = req_get_ioprio(vbr->req); | |
119 | break; | |
120 | case REQ_TYPE_BLOCK_PC: | |
121 | vbr->out_hdr.type = VIRTIO_BLK_T_SCSI_CMD; | |
f1b0ef06 CH |
122 | vbr->out_hdr.sector = 0; |
123 | vbr->out_hdr.ioprio = req_get_ioprio(vbr->req); | |
124 | break; | |
dd40e456 FT |
125 | case REQ_TYPE_SPECIAL: |
126 | vbr->out_hdr.type = VIRTIO_BLK_T_GET_ID; | |
127 | vbr->out_hdr.sector = 0; | |
128 | vbr->out_hdr.ioprio = req_get_ioprio(vbr->req); | |
129 | break; | |
130 | default: | |
131 | /* We don't put anything else in the queue. */ | |
132 | BUG(); | |
f1b0ef06 | 133 | } |
e467cde2 RR |
134 | } |
135 | ||
1cde26f9 | 136 | sg_set_buf(&vblk->sg[out++], &vbr->out_hdr, sizeof(vbr->out_hdr)); |
e467cde2 | 137 | |
1cde26f9 HR |
138 | /* |
139 | * If this is a packet command we need a couple of additional headers. | |
140 | * Behind the normal outhdr we put a segment with the scsi command | |
141 | * block, and before the normal inhdr we put the sense data and the | |
142 | * inhdr with additional status information before the normal inhdr. | |
143 | */ | |
33659ebb | 144 | if (vbr->req->cmd_type == REQ_TYPE_BLOCK_PC) |
1cde26f9 HR |
145 | sg_set_buf(&vblk->sg[out++], vbr->req->cmd, vbr->req->cmd_len); |
146 | ||
147 | num = blk_rq_map_sg(q, vbr->req, vblk->sg + out); | |
148 | ||
33659ebb | 149 | if (vbr->req->cmd_type == REQ_TYPE_BLOCK_PC) { |
6917f83f | 150 | sg_set_buf(&vblk->sg[num + out + in++], vbr->req->sense, SCSI_SENSE_BUFFERSIZE); |
1cde26f9 HR |
151 | sg_set_buf(&vblk->sg[num + out + in++], &vbr->in_hdr, |
152 | sizeof(vbr->in_hdr)); | |
153 | } | |
154 | ||
155 | sg_set_buf(&vblk->sg[num + out + in++], &vbr->status, | |
156 | sizeof(vbr->status)); | |
157 | ||
158 | if (num) { | |
159 | if (rq_data_dir(vbr->req) == WRITE) { | |
160 | vbr->out_hdr.type |= VIRTIO_BLK_T_OUT; | |
161 | out += num; | |
162 | } else { | |
163 | vbr->out_hdr.type |= VIRTIO_BLK_T_IN; | |
164 | in += num; | |
165 | } | |
e467cde2 RR |
166 | } |
167 | ||
09ec6b69 | 168 | if (virtqueue_add_buf(vblk->vq, vblk->sg, out, in, vbr) < 0) { |
e467cde2 RR |
169 | mempool_free(vbr, vblk->pool); |
170 | return false; | |
171 | } | |
172 | ||
173 | list_add_tail(&vbr->list, &vblk->reqs); | |
174 | return true; | |
175 | } | |
176 | ||
177 | static void do_virtblk_request(struct request_queue *q) | |
178 | { | |
6c3b46f7 | 179 | struct virtio_blk *vblk = q->queuedata; |
e467cde2 RR |
180 | struct request *req; |
181 | unsigned int issued = 0; | |
182 | ||
9934c8c0 | 183 | while ((req = blk_peek_request(q)) != NULL) { |
0864b79a | 184 | BUG_ON(req->nr_phys_segments + 2 > vblk->sg_elems); |
e467cde2 RR |
185 | |
186 | /* If this request fails, stop queue and wait for something to | |
187 | finish to restart it. */ | |
188 | if (!do_req(q, vblk, req)) { | |
189 | blk_stop_queue(q); | |
190 | break; | |
191 | } | |
9934c8c0 | 192 | blk_start_request(req); |
e467cde2 RR |
193 | issued++; |
194 | } | |
195 | ||
196 | if (issued) | |
09ec6b69 | 197 | virtqueue_kick(vblk->vq); |
e467cde2 RR |
198 | } |
199 | ||
4cb2ea28 | 200 | /* return id (s/n) string for *disk to *id_str |
201 | */ | |
202 | static int virtblk_get_id(struct gendisk *disk, char *id_str) | |
203 | { | |
204 | struct virtio_blk *vblk = disk->private_data; | |
205 | struct request *req; | |
206 | struct bio *bio; | |
e4c4776d | 207 | int err; |
4cb2ea28 | 208 | |
209 | bio = bio_map_kern(vblk->disk->queue, id_str, VIRTIO_BLK_ID_BYTES, | |
210 | GFP_KERNEL); | |
211 | if (IS_ERR(bio)) | |
212 | return PTR_ERR(bio); | |
213 | ||
214 | req = blk_make_request(vblk->disk->queue, bio, GFP_KERNEL); | |
215 | if (IS_ERR(req)) { | |
216 | bio_put(bio); | |
217 | return PTR_ERR(req); | |
218 | } | |
219 | ||
220 | req->cmd_type = REQ_TYPE_SPECIAL; | |
e4c4776d MS |
221 | err = blk_execute_rq(vblk->disk->queue, vblk->disk, req, false); |
222 | blk_put_request(req); | |
223 | ||
224 | return err; | |
4cb2ea28 | 225 | } |
226 | ||
fe5a50a1 CH |
227 | static int virtblk_ioctl(struct block_device *bdev, fmode_t mode, |
228 | unsigned int cmd, unsigned long data) | |
e467cde2 | 229 | { |
1cde26f9 HR |
230 | struct gendisk *disk = bdev->bd_disk; |
231 | struct virtio_blk *vblk = disk->private_data; | |
232 | ||
233 | /* | |
234 | * Only allow the generic SCSI ioctls if the host can support it. | |
235 | */ | |
236 | if (!virtio_has_feature(vblk->vdev, VIRTIO_BLK_F_SCSI)) | |
d9ecdea7 | 237 | return -ENOTTY; |
1cde26f9 | 238 | |
3225beab RR |
239 | return scsi_cmd_ioctl(disk->queue, disk, mode, cmd, |
240 | (void __user *)data); | |
e467cde2 RR |
241 | } |
242 | ||
135da0b0 CB |
243 | /* We provide getgeo only to please some old bootloader/partitioning tools */ |
244 | static int virtblk_getgeo(struct block_device *bd, struct hd_geometry *geo) | |
245 | { | |
48e4043d RH |
246 | struct virtio_blk *vblk = bd->bd_disk->private_data; |
247 | struct virtio_blk_geometry vgeo; | |
248 | int err; | |
249 | ||
250 | /* see if the host passed in geometry config */ | |
251 | err = virtio_config_val(vblk->vdev, VIRTIO_BLK_F_GEOMETRY, | |
252 | offsetof(struct virtio_blk_config, geometry), | |
253 | &vgeo); | |
254 | ||
255 | if (!err) { | |
256 | geo->heads = vgeo.heads; | |
257 | geo->sectors = vgeo.sectors; | |
258 | geo->cylinders = vgeo.cylinders; | |
259 | } else { | |
260 | /* some standard values, similar to sd */ | |
261 | geo->heads = 1 << 6; | |
262 | geo->sectors = 1 << 5; | |
263 | geo->cylinders = get_capacity(bd->bd_disk) >> 11; | |
264 | } | |
135da0b0 CB |
265 | return 0; |
266 | } | |
267 | ||
83d5cde4 | 268 | static const struct block_device_operations virtblk_fops = { |
8a6cfeb6 | 269 | .ioctl = virtblk_ioctl, |
135da0b0 CB |
270 | .owner = THIS_MODULE, |
271 | .getgeo = virtblk_getgeo, | |
e467cde2 RR |
272 | }; |
273 | ||
d50ed907 CB |
274 | static int index_to_minor(int index) |
275 | { | |
276 | return index << PART_BITS; | |
277 | } | |
278 | ||
a5eb9e4f RH |
279 | static ssize_t virtblk_serial_show(struct device *dev, |
280 | struct device_attribute *attr, char *buf) | |
281 | { | |
282 | struct gendisk *disk = dev_to_disk(dev); | |
283 | int err; | |
284 | ||
285 | /* sysfs gives us a PAGE_SIZE buffer */ | |
286 | BUILD_BUG_ON(PAGE_SIZE < VIRTIO_BLK_ID_BYTES); | |
287 | ||
288 | buf[VIRTIO_BLK_ID_BYTES] = '\0'; | |
289 | err = virtblk_get_id(disk, buf); | |
290 | if (!err) | |
291 | return strlen(buf); | |
292 | ||
293 | if (err == -EIO) /* Unsupported? Make it empty. */ | |
294 | return 0; | |
295 | ||
296 | return err; | |
297 | } | |
298 | DEVICE_ATTR(serial, S_IRUGO, virtblk_serial_show, NULL); | |
299 | ||
7a7c924c CH |
300 | static void virtblk_config_changed_work(struct work_struct *work) |
301 | { | |
302 | struct virtio_blk *vblk = | |
303 | container_of(work, struct virtio_blk, config_work); | |
304 | struct virtio_device *vdev = vblk->vdev; | |
305 | struct request_queue *q = vblk->disk->queue; | |
306 | char cap_str_2[10], cap_str_10[10]; | |
307 | u64 capacity, size; | |
308 | ||
309 | /* Host must always specify the capacity. */ | |
310 | vdev->config->get(vdev, offsetof(struct virtio_blk_config, capacity), | |
311 | &capacity, sizeof(capacity)); | |
312 | ||
313 | /* If capacity is too big, truncate with warning. */ | |
314 | if ((sector_t)capacity != capacity) { | |
315 | dev_warn(&vdev->dev, "Capacity %llu too large: truncating\n", | |
316 | (unsigned long long)capacity); | |
317 | capacity = (sector_t)-1; | |
318 | } | |
319 | ||
320 | size = capacity * queue_logical_block_size(q); | |
321 | string_get_size(size, STRING_UNITS_2, cap_str_2, sizeof(cap_str_2)); | |
322 | string_get_size(size, STRING_UNITS_10, cap_str_10, sizeof(cap_str_10)); | |
323 | ||
324 | dev_notice(&vdev->dev, | |
325 | "new size: %llu %d-byte logical blocks (%s/%s)\n", | |
326 | (unsigned long long)capacity, | |
327 | queue_logical_block_size(q), | |
328 | cap_str_10, cap_str_2); | |
329 | ||
330 | set_capacity(vblk->disk, capacity); | |
331 | } | |
332 | ||
333 | static void virtblk_config_changed(struct virtio_device *vdev) | |
334 | { | |
335 | struct virtio_blk *vblk = vdev->priv; | |
336 | ||
337 | queue_work(virtblk_wq, &vblk->config_work); | |
338 | } | |
339 | ||
98e94444 | 340 | static int __devinit virtblk_probe(struct virtio_device *vdev) |
e467cde2 RR |
341 | { |
342 | struct virtio_blk *vblk; | |
69740c8b | 343 | struct request_queue *q; |
4f3bf19c | 344 | int err; |
e467cde2 | 345 | u64 cap; |
69740c8b CH |
346 | u32 v, blk_size, sg_elems, opt_io_size; |
347 | u16 min_io_size; | |
348 | u8 physical_block_exp, alignment_offset; | |
e467cde2 | 349 | |
d50ed907 | 350 | if (index_to_minor(index) >= 1 << MINORBITS) |
4f3bf19c CB |
351 | return -ENOSPC; |
352 | ||
0864b79a RR |
353 | /* We need to know how many segments before we allocate. */ |
354 | err = virtio_config_val(vdev, VIRTIO_BLK_F_SEG_MAX, | |
355 | offsetof(struct virtio_blk_config, seg_max), | |
356 | &sg_elems); | |
a5b365a6 CH |
357 | |
358 | /* We need at least one SG element, whatever they say. */ | |
359 | if (err || !sg_elems) | |
0864b79a RR |
360 | sg_elems = 1; |
361 | ||
362 | /* We need an extra sg elements at head and tail. */ | |
363 | sg_elems += 2; | |
364 | vdev->priv = vblk = kmalloc(sizeof(*vblk) + | |
365 | sizeof(vblk->sg[0]) * sg_elems, GFP_KERNEL); | |
e467cde2 RR |
366 | if (!vblk) { |
367 | err = -ENOMEM; | |
368 | goto out; | |
369 | } | |
370 | ||
371 | INIT_LIST_HEAD(&vblk->reqs); | |
372 | spin_lock_init(&vblk->lock); | |
373 | vblk->vdev = vdev; | |
0864b79a RR |
374 | vblk->sg_elems = sg_elems; |
375 | sg_init_table(vblk->sg, vblk->sg_elems); | |
7a7c924c | 376 | INIT_WORK(&vblk->config_work, virtblk_config_changed_work); |
e467cde2 RR |
377 | |
378 | /* We expect one virtqueue, for output. */ | |
d2a7ddda | 379 | vblk->vq = virtio_find_single_vq(vdev, blk_done, "requests"); |
e467cde2 RR |
380 | if (IS_ERR(vblk->vq)) { |
381 | err = PTR_ERR(vblk->vq); | |
382 | goto out_free_vblk; | |
383 | } | |
384 | ||
385 | vblk->pool = mempool_create_kmalloc_pool(1,sizeof(struct virtblk_req)); | |
386 | if (!vblk->pool) { | |
387 | err = -ENOMEM; | |
388 | goto out_free_vq; | |
389 | } | |
390 | ||
e467cde2 | 391 | /* FIXME: How many partitions? How long is a piece of string? */ |
4f3bf19c | 392 | vblk->disk = alloc_disk(1 << PART_BITS); |
e467cde2 RR |
393 | if (!vblk->disk) { |
394 | err = -ENOMEM; | |
4f3bf19c | 395 | goto out_mempool; |
e467cde2 RR |
396 | } |
397 | ||
69740c8b CH |
398 | q = vblk->disk->queue = blk_init_queue(do_virtblk_request, &vblk->lock); |
399 | if (!q) { | |
e467cde2 RR |
400 | err = -ENOMEM; |
401 | goto out_put_disk; | |
402 | } | |
403 | ||
69740c8b | 404 | q->queuedata = vblk; |
7d116b62 | 405 | |
d50ed907 CB |
406 | if (index < 26) { |
407 | sprintf(vblk->disk->disk_name, "vd%c", 'a' + index % 26); | |
408 | } else if (index < (26 + 1) * 26) { | |
409 | sprintf(vblk->disk->disk_name, "vd%c%c", | |
410 | 'a' + index / 26 - 1, 'a' + index % 26); | |
411 | } else { | |
412 | const unsigned int m1 = (index / 26 - 1) / 26 - 1; | |
413 | const unsigned int m2 = (index / 26 - 1) % 26; | |
414 | const unsigned int m3 = index % 26; | |
415 | sprintf(vblk->disk->disk_name, "vd%c%c%c", | |
416 | 'a' + m1, 'a' + m2, 'a' + m3); | |
417 | } | |
418 | ||
e467cde2 | 419 | vblk->disk->major = major; |
d50ed907 | 420 | vblk->disk->first_minor = index_to_minor(index); |
e467cde2 RR |
421 | vblk->disk->private_data = vblk; |
422 | vblk->disk->fops = &virtblk_fops; | |
c4839346 | 423 | vblk->disk->driverfs_dev = &vdev->dev; |
d50ed907 | 424 | index++; |
4f3bf19c | 425 | |
02c42b7a | 426 | /* configure queue flush support */ |
4913efe4 TH |
427 | if (virtio_has_feature(vdev, VIRTIO_BLK_F_FLUSH)) |
428 | blk_queue_flush(q, REQ_FLUSH); | |
e467cde2 | 429 | |
3ef53609 CB |
430 | /* If disk is read-only in the host, the guest should obey */ |
431 | if (virtio_has_feature(vdev, VIRTIO_BLK_F_RO)) | |
432 | set_disk_ro(vblk->disk, 1); | |
433 | ||
a586d4f6 | 434 | /* Host must always specify the capacity. */ |
72e61eb4 RR |
435 | vdev->config->get(vdev, offsetof(struct virtio_blk_config, capacity), |
436 | &cap, sizeof(cap)); | |
e467cde2 RR |
437 | |
438 | /* If capacity is too big, truncate with warning. */ | |
439 | if ((sector_t)cap != cap) { | |
440 | dev_warn(&vdev->dev, "Capacity %llu too large: truncating\n", | |
441 | (unsigned long long)cap); | |
442 | cap = (sector_t)-1; | |
443 | } | |
444 | set_capacity(vblk->disk, cap); | |
445 | ||
0864b79a | 446 | /* We can handle whatever the host told us to handle. */ |
ee714f2d | 447 | blk_queue_max_segments(q, vblk->sg_elems-2); |
0864b79a | 448 | |
4eff3cae | 449 | /* No need to bounce any requests */ |
69740c8b | 450 | blk_queue_bounce_limit(q, BLK_BOUNCE_ANY); |
4eff3cae | 451 | |
4b7f7e20 | 452 | /* No real sector limit. */ |
ee714f2d | 453 | blk_queue_max_hw_sectors(q, -1U); |
4b7f7e20 | 454 | |
a586d4f6 RR |
455 | /* Host can optionally specify maximum segment size and number of |
456 | * segments. */ | |
457 | err = virtio_config_val(vdev, VIRTIO_BLK_F_SIZE_MAX, | |
458 | offsetof(struct virtio_blk_config, size_max), | |
459 | &v); | |
e467cde2 | 460 | if (!err) |
69740c8b | 461 | blk_queue_max_segment_size(q, v); |
4b7f7e20 | 462 | else |
69740c8b | 463 | blk_queue_max_segment_size(q, -1U); |
e467cde2 | 464 | |
066f4d82 CB |
465 | /* Host can optionally specify the block size of the device */ |
466 | err = virtio_config_val(vdev, VIRTIO_BLK_F_BLK_SIZE, | |
467 | offsetof(struct virtio_blk_config, blk_size), | |
468 | &blk_size); | |
469 | if (!err) | |
69740c8b CH |
470 | blk_queue_logical_block_size(q, blk_size); |
471 | else | |
472 | blk_size = queue_logical_block_size(q); | |
473 | ||
474 | /* Use topology information if available */ | |
475 | err = virtio_config_val(vdev, VIRTIO_BLK_F_TOPOLOGY, | |
476 | offsetof(struct virtio_blk_config, physical_block_exp), | |
477 | &physical_block_exp); | |
478 | if (!err && physical_block_exp) | |
479 | blk_queue_physical_block_size(q, | |
480 | blk_size * (1 << physical_block_exp)); | |
481 | ||
482 | err = virtio_config_val(vdev, VIRTIO_BLK_F_TOPOLOGY, | |
483 | offsetof(struct virtio_blk_config, alignment_offset), | |
484 | &alignment_offset); | |
485 | if (!err && alignment_offset) | |
486 | blk_queue_alignment_offset(q, blk_size * alignment_offset); | |
487 | ||
488 | err = virtio_config_val(vdev, VIRTIO_BLK_F_TOPOLOGY, | |
489 | offsetof(struct virtio_blk_config, min_io_size), | |
490 | &min_io_size); | |
491 | if (!err && min_io_size) | |
492 | blk_queue_io_min(q, blk_size * min_io_size); | |
493 | ||
494 | err = virtio_config_val(vdev, VIRTIO_BLK_F_TOPOLOGY, | |
495 | offsetof(struct virtio_blk_config, opt_io_size), | |
496 | &opt_io_size); | |
497 | if (!err && opt_io_size) | |
498 | blk_queue_io_opt(q, blk_size * opt_io_size); | |
499 | ||
066f4d82 | 500 | |
e467cde2 | 501 | add_disk(vblk->disk); |
a5eb9e4f RH |
502 | err = device_create_file(disk_to_dev(vblk->disk), &dev_attr_serial); |
503 | if (err) | |
504 | goto out_del_disk; | |
505 | ||
e467cde2 RR |
506 | return 0; |
507 | ||
a5eb9e4f RH |
508 | out_del_disk: |
509 | del_gendisk(vblk->disk); | |
510 | blk_cleanup_queue(vblk->disk->queue); | |
e467cde2 RR |
511 | out_put_disk: |
512 | put_disk(vblk->disk); | |
e467cde2 RR |
513 | out_mempool: |
514 | mempool_destroy(vblk->pool); | |
515 | out_free_vq: | |
d2a7ddda | 516 | vdev->config->del_vqs(vdev); |
e467cde2 RR |
517 | out_free_vblk: |
518 | kfree(vblk); | |
519 | out: | |
520 | return err; | |
521 | } | |
522 | ||
98e94444 | 523 | static void __devexit virtblk_remove(struct virtio_device *vdev) |
e467cde2 RR |
524 | { |
525 | struct virtio_blk *vblk = vdev->priv; | |
e467cde2 | 526 | |
7a7c924c CH |
527 | flush_work(&vblk->config_work); |
528 | ||
6e5aa7ef | 529 | /* Nothing should be pending. */ |
e467cde2 | 530 | BUG_ON(!list_empty(&vblk->reqs)); |
6e5aa7ef RR |
531 | |
532 | /* Stop all the virtqueues. */ | |
533 | vdev->config->reset(vdev); | |
534 | ||
ac9d463a | 535 | del_gendisk(vblk->disk); |
e467cde2 RR |
536 | blk_cleanup_queue(vblk->disk->queue); |
537 | put_disk(vblk->disk); | |
e467cde2 | 538 | mempool_destroy(vblk->pool); |
d2a7ddda | 539 | vdev->config->del_vqs(vdev); |
e467cde2 RR |
540 | kfree(vblk); |
541 | } | |
542 | ||
47483e25 | 543 | static const struct virtio_device_id id_table[] = { |
e467cde2 RR |
544 | { VIRTIO_ID_BLOCK, VIRTIO_DEV_ANY_ID }, |
545 | { 0 }, | |
546 | }; | |
547 | ||
c45a6816 | 548 | static unsigned int features[] = { |
02c42b7a TH |
549 | VIRTIO_BLK_F_SEG_MAX, VIRTIO_BLK_F_SIZE_MAX, VIRTIO_BLK_F_GEOMETRY, |
550 | VIRTIO_BLK_F_RO, VIRTIO_BLK_F_BLK_SIZE, VIRTIO_BLK_F_SCSI, | |
551 | VIRTIO_BLK_F_FLUSH, VIRTIO_BLK_F_TOPOLOGY | |
c45a6816 RR |
552 | }; |
553 | ||
4fbfff76 RM |
554 | /* |
555 | * virtio_blk causes spurious section mismatch warning by | |
556 | * simultaneously referring to a __devinit and a __devexit function. | |
557 | * Use __refdata to avoid this warning. | |
558 | */ | |
559 | static struct virtio_driver __refdata virtio_blk = { | |
7a7c924c CH |
560 | .feature_table = features, |
561 | .feature_table_size = ARRAY_SIZE(features), | |
562 | .driver.name = KBUILD_MODNAME, | |
563 | .driver.owner = THIS_MODULE, | |
564 | .id_table = id_table, | |
565 | .probe = virtblk_probe, | |
566 | .remove = __devexit_p(virtblk_remove), | |
567 | .config_changed = virtblk_config_changed, | |
e467cde2 RR |
568 | }; |
569 | ||
570 | static int __init init(void) | |
571 | { | |
7a7c924c CH |
572 | int error; |
573 | ||
574 | virtblk_wq = alloc_workqueue("virtio-blk", 0, 0); | |
575 | if (!virtblk_wq) | |
576 | return -ENOMEM; | |
577 | ||
4f3bf19c | 578 | major = register_blkdev(0, "virtblk"); |
7a7c924c CH |
579 | if (major < 0) { |
580 | error = major; | |
581 | goto out_destroy_workqueue; | |
582 | } | |
583 | ||
584 | error = register_virtio_driver(&virtio_blk); | |
585 | if (error) | |
586 | goto out_unregister_blkdev; | |
587 | return 0; | |
588 | ||
589 | out_unregister_blkdev: | |
590 | unregister_blkdev(major, "virtblk"); | |
591 | out_destroy_workqueue: | |
592 | destroy_workqueue(virtblk_wq); | |
593 | return error; | |
e467cde2 RR |
594 | } |
595 | ||
596 | static void __exit fini(void) | |
597 | { | |
4f3bf19c | 598 | unregister_blkdev(major, "virtblk"); |
e467cde2 | 599 | unregister_virtio_driver(&virtio_blk); |
7a7c924c | 600 | destroy_workqueue(virtblk_wq); |
e467cde2 RR |
601 | } |
602 | module_init(init); | |
603 | module_exit(fini); | |
604 | ||
605 | MODULE_DEVICE_TABLE(virtio, id_table); | |
606 | MODULE_DESCRIPTION("Virtio block driver"); | |
607 | MODULE_LICENSE("GPL"); |