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> | |
0c8d44f2 | 6 | #include <linux/module.h> |
4678d6f9 | 7 | #include <linux/mutex.h> |
e467cde2 RR |
8 | #include <linux/virtio.h> |
9 | #include <linux/virtio_blk.h> | |
3d1266c7 | 10 | #include <linux/scatterlist.h> |
7a7c924c | 11 | #include <linux/string_helpers.h> |
6917f83f | 12 | #include <scsi/scsi_cmnd.h> |
5087a50e | 13 | #include <linux/idr.h> |
3d1266c7 | 14 | |
4f3bf19c | 15 | #define PART_BITS 4 |
e467cde2 | 16 | |
5087a50e MT |
17 | static int major; |
18 | static DEFINE_IDA(vd_index_ida); | |
19 | ||
7a7c924c | 20 | struct workqueue_struct *virtblk_wq; |
4f3bf19c | 21 | |
e467cde2 RR |
22 | struct virtio_blk |
23 | { | |
24 | spinlock_t lock; | |
25 | ||
26 | struct virtio_device *vdev; | |
27 | struct virtqueue *vq; | |
28 | ||
29 | /* The disk structure for the kernel. */ | |
30 | struct gendisk *disk; | |
31 | ||
32 | /* Request tracking. */ | |
33 | struct list_head reqs; | |
34 | ||
35 | mempool_t *pool; | |
36 | ||
7a7c924c CH |
37 | /* Process context for config space updates */ |
38 | struct work_struct config_work; | |
39 | ||
4678d6f9 MT |
40 | /* Lock for config space updates */ |
41 | struct mutex config_lock; | |
42 | ||
43 | /* enable config space updates */ | |
44 | bool config_enable; | |
45 | ||
0864b79a RR |
46 | /* What host tells us, plus 2 for header & tailer. */ |
47 | unsigned int sg_elems; | |
48 | ||
5087a50e MT |
49 | /* Ida index - used to track minor number allocations. */ |
50 | int index; | |
51 | ||
e467cde2 | 52 | /* Scatterlist: can be too big for stack. */ |
0864b79a | 53 | struct scatterlist sg[/*sg_elems*/]; |
e467cde2 RR |
54 | }; |
55 | ||
56 | struct virtblk_req | |
57 | { | |
58 | struct list_head list; | |
59 | struct request *req; | |
60 | struct virtio_blk_outhdr out_hdr; | |
1cde26f9 | 61 | struct virtio_scsi_inhdr in_hdr; |
cb38fa23 | 62 | u8 status; |
e467cde2 RR |
63 | }; |
64 | ||
18445c4d | 65 | static void blk_done(struct virtqueue *vq) |
e467cde2 RR |
66 | { |
67 | struct virtio_blk *vblk = vq->vdev->priv; | |
68 | struct virtblk_req *vbr; | |
69 | unsigned int len; | |
70 | unsigned long flags; | |
71 | ||
72 | spin_lock_irqsave(&vblk->lock, flags); | |
09ec6b69 | 73 | while ((vbr = virtqueue_get_buf(vblk->vq, &len)) != NULL) { |
8316982a | 74 | int error; |
1cde26f9 | 75 | |
cb38fa23 | 76 | switch (vbr->status) { |
e467cde2 | 77 | case VIRTIO_BLK_S_OK: |
8316982a | 78 | error = 0; |
e467cde2 RR |
79 | break; |
80 | case VIRTIO_BLK_S_UNSUPP: | |
8316982a | 81 | error = -ENOTTY; |
e467cde2 RR |
82 | break; |
83 | default: | |
8316982a | 84 | error = -EIO; |
e467cde2 RR |
85 | break; |
86 | } | |
87 | ||
33659ebb CH |
88 | switch (vbr->req->cmd_type) { |
89 | case REQ_TYPE_BLOCK_PC: | |
1cde26f9 HR |
90 | vbr->req->resid_len = vbr->in_hdr.residual; |
91 | vbr->req->sense_len = vbr->in_hdr.sense_len; | |
92 | vbr->req->errors = vbr->in_hdr.errors; | |
33659ebb CH |
93 | break; |
94 | case REQ_TYPE_SPECIAL: | |
4cb2ea28 | 95 | vbr->req->errors = (error != 0); |
33659ebb | 96 | break; |
15fa6e81 JA |
97 | default: |
98 | break; | |
33659ebb | 99 | } |
1cde26f9 | 100 | |
40cbbb78 | 101 | __blk_end_request_all(vbr->req, error); |
e467cde2 RR |
102 | list_del(&vbr->list); |
103 | mempool_free(vbr, vblk->pool); | |
104 | } | |
105 | /* In case queue is stopped waiting for more buffers. */ | |
106 | blk_start_queue(vblk->disk->queue); | |
107 | spin_unlock_irqrestore(&vblk->lock, flags); | |
e467cde2 RR |
108 | } |
109 | ||
110 | static bool do_req(struct request_queue *q, struct virtio_blk *vblk, | |
111 | struct request *req) | |
112 | { | |
1cde26f9 | 113 | unsigned long num, out = 0, in = 0; |
e467cde2 RR |
114 | struct virtblk_req *vbr; |
115 | ||
116 | vbr = mempool_alloc(vblk->pool, GFP_ATOMIC); | |
117 | if (!vbr) | |
118 | /* When another request finishes we'll try again. */ | |
119 | return false; | |
120 | ||
121 | vbr->req = req; | |
dd40e456 FT |
122 | |
123 | if (req->cmd_flags & REQ_FLUSH) { | |
124 | vbr->out_hdr.type = VIRTIO_BLK_T_FLUSH; | |
4cb2ea28 | 125 | vbr->out_hdr.sector = 0; |
126 | vbr->out_hdr.ioprio = req_get_ioprio(vbr->req); | |
dd40e456 FT |
127 | } else { |
128 | switch (req->cmd_type) { | |
129 | case REQ_TYPE_FS: | |
130 | vbr->out_hdr.type = 0; | |
131 | vbr->out_hdr.sector = blk_rq_pos(vbr->req); | |
132 | vbr->out_hdr.ioprio = req_get_ioprio(vbr->req); | |
133 | break; | |
134 | case REQ_TYPE_BLOCK_PC: | |
135 | vbr->out_hdr.type = VIRTIO_BLK_T_SCSI_CMD; | |
f1b0ef06 CH |
136 | vbr->out_hdr.sector = 0; |
137 | vbr->out_hdr.ioprio = req_get_ioprio(vbr->req); | |
138 | break; | |
dd40e456 FT |
139 | case REQ_TYPE_SPECIAL: |
140 | vbr->out_hdr.type = VIRTIO_BLK_T_GET_ID; | |
141 | vbr->out_hdr.sector = 0; | |
142 | vbr->out_hdr.ioprio = req_get_ioprio(vbr->req); | |
143 | break; | |
144 | default: | |
145 | /* We don't put anything else in the queue. */ | |
146 | BUG(); | |
f1b0ef06 | 147 | } |
e467cde2 RR |
148 | } |
149 | ||
1cde26f9 | 150 | sg_set_buf(&vblk->sg[out++], &vbr->out_hdr, sizeof(vbr->out_hdr)); |
e467cde2 | 151 | |
1cde26f9 HR |
152 | /* |
153 | * If this is a packet command we need a couple of additional headers. | |
154 | * Behind the normal outhdr we put a segment with the scsi command | |
155 | * block, and before the normal inhdr we put the sense data and the | |
156 | * inhdr with additional status information before the normal inhdr. | |
157 | */ | |
33659ebb | 158 | if (vbr->req->cmd_type == REQ_TYPE_BLOCK_PC) |
1cde26f9 HR |
159 | sg_set_buf(&vblk->sg[out++], vbr->req->cmd, vbr->req->cmd_len); |
160 | ||
161 | num = blk_rq_map_sg(q, vbr->req, vblk->sg + out); | |
162 | ||
33659ebb | 163 | if (vbr->req->cmd_type == REQ_TYPE_BLOCK_PC) { |
6917f83f | 164 | sg_set_buf(&vblk->sg[num + out + in++], vbr->req->sense, SCSI_SENSE_BUFFERSIZE); |
1cde26f9 HR |
165 | sg_set_buf(&vblk->sg[num + out + in++], &vbr->in_hdr, |
166 | sizeof(vbr->in_hdr)); | |
167 | } | |
168 | ||
169 | sg_set_buf(&vblk->sg[num + out + in++], &vbr->status, | |
170 | sizeof(vbr->status)); | |
171 | ||
172 | if (num) { | |
173 | if (rq_data_dir(vbr->req) == WRITE) { | |
174 | vbr->out_hdr.type |= VIRTIO_BLK_T_OUT; | |
175 | out += num; | |
176 | } else { | |
177 | vbr->out_hdr.type |= VIRTIO_BLK_T_IN; | |
178 | in += num; | |
179 | } | |
e467cde2 RR |
180 | } |
181 | ||
f96fde41 | 182 | if (virtqueue_add_buf(vblk->vq, vblk->sg, out, in, vbr, GFP_ATOMIC)<0) { |
e467cde2 RR |
183 | mempool_free(vbr, vblk->pool); |
184 | return false; | |
185 | } | |
186 | ||
187 | list_add_tail(&vbr->list, &vblk->reqs); | |
188 | return true; | |
189 | } | |
190 | ||
191 | static void do_virtblk_request(struct request_queue *q) | |
192 | { | |
6c3b46f7 | 193 | struct virtio_blk *vblk = q->queuedata; |
e467cde2 RR |
194 | struct request *req; |
195 | unsigned int issued = 0; | |
196 | ||
9934c8c0 | 197 | while ((req = blk_peek_request(q)) != NULL) { |
0864b79a | 198 | BUG_ON(req->nr_phys_segments + 2 > vblk->sg_elems); |
e467cde2 RR |
199 | |
200 | /* If this request fails, stop queue and wait for something to | |
201 | finish to restart it. */ | |
202 | if (!do_req(q, vblk, req)) { | |
203 | blk_stop_queue(q); | |
204 | break; | |
205 | } | |
9934c8c0 | 206 | blk_start_request(req); |
e467cde2 RR |
207 | issued++; |
208 | } | |
209 | ||
210 | if (issued) | |
09ec6b69 | 211 | virtqueue_kick(vblk->vq); |
e467cde2 RR |
212 | } |
213 | ||
4cb2ea28 | 214 | /* return id (s/n) string for *disk to *id_str |
215 | */ | |
216 | static int virtblk_get_id(struct gendisk *disk, char *id_str) | |
217 | { | |
218 | struct virtio_blk *vblk = disk->private_data; | |
219 | struct request *req; | |
220 | struct bio *bio; | |
e4c4776d | 221 | int err; |
4cb2ea28 | 222 | |
223 | bio = bio_map_kern(vblk->disk->queue, id_str, VIRTIO_BLK_ID_BYTES, | |
224 | GFP_KERNEL); | |
225 | if (IS_ERR(bio)) | |
226 | return PTR_ERR(bio); | |
227 | ||
228 | req = blk_make_request(vblk->disk->queue, bio, GFP_KERNEL); | |
229 | if (IS_ERR(req)) { | |
230 | bio_put(bio); | |
231 | return PTR_ERR(req); | |
232 | } | |
233 | ||
234 | req->cmd_type = REQ_TYPE_SPECIAL; | |
e4c4776d MS |
235 | err = blk_execute_rq(vblk->disk->queue, vblk->disk, req, false); |
236 | blk_put_request(req); | |
237 | ||
238 | return err; | |
4cb2ea28 | 239 | } |
240 | ||
fe5a50a1 CH |
241 | static int virtblk_ioctl(struct block_device *bdev, fmode_t mode, |
242 | unsigned int cmd, unsigned long data) | |
e467cde2 | 243 | { |
1cde26f9 HR |
244 | struct gendisk *disk = bdev->bd_disk; |
245 | struct virtio_blk *vblk = disk->private_data; | |
246 | ||
247 | /* | |
248 | * Only allow the generic SCSI ioctls if the host can support it. | |
249 | */ | |
250 | if (!virtio_has_feature(vblk->vdev, VIRTIO_BLK_F_SCSI)) | |
d9ecdea7 | 251 | return -ENOTTY; |
1cde26f9 | 252 | |
3225beab RR |
253 | return scsi_cmd_ioctl(disk->queue, disk, mode, cmd, |
254 | (void __user *)data); | |
e467cde2 RR |
255 | } |
256 | ||
135da0b0 CB |
257 | /* We provide getgeo only to please some old bootloader/partitioning tools */ |
258 | static int virtblk_getgeo(struct block_device *bd, struct hd_geometry *geo) | |
259 | { | |
48e4043d RH |
260 | struct virtio_blk *vblk = bd->bd_disk->private_data; |
261 | struct virtio_blk_geometry vgeo; | |
262 | int err; | |
263 | ||
264 | /* see if the host passed in geometry config */ | |
265 | err = virtio_config_val(vblk->vdev, VIRTIO_BLK_F_GEOMETRY, | |
266 | offsetof(struct virtio_blk_config, geometry), | |
267 | &vgeo); | |
268 | ||
269 | if (!err) { | |
270 | geo->heads = vgeo.heads; | |
271 | geo->sectors = vgeo.sectors; | |
272 | geo->cylinders = vgeo.cylinders; | |
273 | } else { | |
274 | /* some standard values, similar to sd */ | |
275 | geo->heads = 1 << 6; | |
276 | geo->sectors = 1 << 5; | |
277 | geo->cylinders = get_capacity(bd->bd_disk) >> 11; | |
278 | } | |
135da0b0 CB |
279 | return 0; |
280 | } | |
281 | ||
83d5cde4 | 282 | static const struct block_device_operations virtblk_fops = { |
8a6cfeb6 | 283 | .ioctl = virtblk_ioctl, |
135da0b0 CB |
284 | .owner = THIS_MODULE, |
285 | .getgeo = virtblk_getgeo, | |
e467cde2 RR |
286 | }; |
287 | ||
d50ed907 CB |
288 | static int index_to_minor(int index) |
289 | { | |
290 | return index << PART_BITS; | |
291 | } | |
292 | ||
5087a50e MT |
293 | static int minor_to_index(int minor) |
294 | { | |
295 | return minor >> PART_BITS; | |
296 | } | |
297 | ||
a5eb9e4f RH |
298 | static ssize_t virtblk_serial_show(struct device *dev, |
299 | struct device_attribute *attr, char *buf) | |
300 | { | |
301 | struct gendisk *disk = dev_to_disk(dev); | |
302 | int err; | |
303 | ||
304 | /* sysfs gives us a PAGE_SIZE buffer */ | |
305 | BUILD_BUG_ON(PAGE_SIZE < VIRTIO_BLK_ID_BYTES); | |
306 | ||
307 | buf[VIRTIO_BLK_ID_BYTES] = '\0'; | |
308 | err = virtblk_get_id(disk, buf); | |
309 | if (!err) | |
310 | return strlen(buf); | |
311 | ||
312 | if (err == -EIO) /* Unsupported? Make it empty. */ | |
313 | return 0; | |
314 | ||
315 | return err; | |
316 | } | |
317 | DEVICE_ATTR(serial, S_IRUGO, virtblk_serial_show, NULL); | |
318 | ||
7a7c924c CH |
319 | static void virtblk_config_changed_work(struct work_struct *work) |
320 | { | |
321 | struct virtio_blk *vblk = | |
322 | container_of(work, struct virtio_blk, config_work); | |
323 | struct virtio_device *vdev = vblk->vdev; | |
324 | struct request_queue *q = vblk->disk->queue; | |
325 | char cap_str_2[10], cap_str_10[10]; | |
326 | u64 capacity, size; | |
327 | ||
4678d6f9 MT |
328 | mutex_lock(&vblk->config_lock); |
329 | if (!vblk->config_enable) | |
330 | goto done; | |
331 | ||
7a7c924c CH |
332 | /* Host must always specify the capacity. */ |
333 | vdev->config->get(vdev, offsetof(struct virtio_blk_config, capacity), | |
334 | &capacity, sizeof(capacity)); | |
335 | ||
336 | /* If capacity is too big, truncate with warning. */ | |
337 | if ((sector_t)capacity != capacity) { | |
338 | dev_warn(&vdev->dev, "Capacity %llu too large: truncating\n", | |
339 | (unsigned long long)capacity); | |
340 | capacity = (sector_t)-1; | |
341 | } | |
342 | ||
343 | size = capacity * queue_logical_block_size(q); | |
344 | string_get_size(size, STRING_UNITS_2, cap_str_2, sizeof(cap_str_2)); | |
345 | string_get_size(size, STRING_UNITS_10, cap_str_10, sizeof(cap_str_10)); | |
346 | ||
347 | dev_notice(&vdev->dev, | |
348 | "new size: %llu %d-byte logical blocks (%s/%s)\n", | |
349 | (unsigned long long)capacity, | |
350 | queue_logical_block_size(q), | |
351 | cap_str_10, cap_str_2); | |
352 | ||
353 | set_capacity(vblk->disk, capacity); | |
4678d6f9 MT |
354 | done: |
355 | mutex_unlock(&vblk->config_lock); | |
7a7c924c CH |
356 | } |
357 | ||
358 | static void virtblk_config_changed(struct virtio_device *vdev) | |
359 | { | |
360 | struct virtio_blk *vblk = vdev->priv; | |
361 | ||
362 | queue_work(virtblk_wq, &vblk->config_work); | |
363 | } | |
364 | ||
6abd6e5a AS |
365 | static int init_vq(struct virtio_blk *vblk) |
366 | { | |
367 | int err = 0; | |
368 | ||
369 | /* We expect one virtqueue, for output. */ | |
370 | vblk->vq = virtio_find_single_vq(vblk->vdev, blk_done, "requests"); | |
371 | if (IS_ERR(vblk->vq)) | |
372 | err = PTR_ERR(vblk->vq); | |
373 | ||
374 | return err; | |
375 | } | |
376 | ||
98e94444 | 377 | static int __devinit virtblk_probe(struct virtio_device *vdev) |
e467cde2 RR |
378 | { |
379 | struct virtio_blk *vblk; | |
69740c8b | 380 | struct request_queue *q; |
5087a50e | 381 | int err, index; |
e467cde2 | 382 | u64 cap; |
69740c8b CH |
383 | u32 v, blk_size, sg_elems, opt_io_size; |
384 | u16 min_io_size; | |
385 | u8 physical_block_exp, alignment_offset; | |
e467cde2 | 386 | |
5087a50e MT |
387 | err = ida_simple_get(&vd_index_ida, 0, minor_to_index(1 << MINORBITS), |
388 | GFP_KERNEL); | |
389 | if (err < 0) | |
390 | goto out; | |
391 | index = err; | |
4f3bf19c | 392 | |
0864b79a RR |
393 | /* We need to know how many segments before we allocate. */ |
394 | err = virtio_config_val(vdev, VIRTIO_BLK_F_SEG_MAX, | |
395 | offsetof(struct virtio_blk_config, seg_max), | |
396 | &sg_elems); | |
a5b365a6 CH |
397 | |
398 | /* We need at least one SG element, whatever they say. */ | |
399 | if (err || !sg_elems) | |
0864b79a RR |
400 | sg_elems = 1; |
401 | ||
402 | /* We need an extra sg elements at head and tail. */ | |
403 | sg_elems += 2; | |
404 | vdev->priv = vblk = kmalloc(sizeof(*vblk) + | |
405 | sizeof(vblk->sg[0]) * sg_elems, GFP_KERNEL); | |
e467cde2 RR |
406 | if (!vblk) { |
407 | err = -ENOMEM; | |
5087a50e | 408 | goto out_free_index; |
e467cde2 RR |
409 | } |
410 | ||
411 | INIT_LIST_HEAD(&vblk->reqs); | |
412 | spin_lock_init(&vblk->lock); | |
413 | vblk->vdev = vdev; | |
0864b79a RR |
414 | vblk->sg_elems = sg_elems; |
415 | sg_init_table(vblk->sg, vblk->sg_elems); | |
4678d6f9 | 416 | mutex_init(&vblk->config_lock); |
7a7c924c | 417 | INIT_WORK(&vblk->config_work, virtblk_config_changed_work); |
4678d6f9 | 418 | vblk->config_enable = true; |
e467cde2 | 419 | |
6abd6e5a AS |
420 | err = init_vq(vblk); |
421 | if (err) | |
e467cde2 | 422 | goto out_free_vblk; |
e467cde2 RR |
423 | |
424 | vblk->pool = mempool_create_kmalloc_pool(1,sizeof(struct virtblk_req)); | |
425 | if (!vblk->pool) { | |
426 | err = -ENOMEM; | |
427 | goto out_free_vq; | |
428 | } | |
429 | ||
e467cde2 | 430 | /* FIXME: How many partitions? How long is a piece of string? */ |
4f3bf19c | 431 | vblk->disk = alloc_disk(1 << PART_BITS); |
e467cde2 RR |
432 | if (!vblk->disk) { |
433 | err = -ENOMEM; | |
4f3bf19c | 434 | goto out_mempool; |
e467cde2 RR |
435 | } |
436 | ||
69740c8b CH |
437 | q = vblk->disk->queue = blk_init_queue(do_virtblk_request, &vblk->lock); |
438 | if (!q) { | |
e467cde2 RR |
439 | err = -ENOMEM; |
440 | goto out_put_disk; | |
441 | } | |
442 | ||
69740c8b | 443 | q->queuedata = vblk; |
7d116b62 | 444 | |
d50ed907 CB |
445 | if (index < 26) { |
446 | sprintf(vblk->disk->disk_name, "vd%c", 'a' + index % 26); | |
447 | } else if (index < (26 + 1) * 26) { | |
448 | sprintf(vblk->disk->disk_name, "vd%c%c", | |
449 | 'a' + index / 26 - 1, 'a' + index % 26); | |
450 | } else { | |
451 | const unsigned int m1 = (index / 26 - 1) / 26 - 1; | |
452 | const unsigned int m2 = (index / 26 - 1) % 26; | |
453 | const unsigned int m3 = index % 26; | |
454 | sprintf(vblk->disk->disk_name, "vd%c%c%c", | |
455 | 'a' + m1, 'a' + m2, 'a' + m3); | |
456 | } | |
457 | ||
e467cde2 | 458 | vblk->disk->major = major; |
d50ed907 | 459 | vblk->disk->first_minor = index_to_minor(index); |
e467cde2 RR |
460 | vblk->disk->private_data = vblk; |
461 | vblk->disk->fops = &virtblk_fops; | |
c4839346 | 462 | vblk->disk->driverfs_dev = &vdev->dev; |
5087a50e | 463 | vblk->index = index; |
4f3bf19c | 464 | |
02c42b7a | 465 | /* configure queue flush support */ |
4913efe4 TH |
466 | if (virtio_has_feature(vdev, VIRTIO_BLK_F_FLUSH)) |
467 | blk_queue_flush(q, REQ_FLUSH); | |
e467cde2 | 468 | |
3ef53609 CB |
469 | /* If disk is read-only in the host, the guest should obey */ |
470 | if (virtio_has_feature(vdev, VIRTIO_BLK_F_RO)) | |
471 | set_disk_ro(vblk->disk, 1); | |
472 | ||
a586d4f6 | 473 | /* Host must always specify the capacity. */ |
72e61eb4 RR |
474 | vdev->config->get(vdev, offsetof(struct virtio_blk_config, capacity), |
475 | &cap, sizeof(cap)); | |
e467cde2 RR |
476 | |
477 | /* If capacity is too big, truncate with warning. */ | |
478 | if ((sector_t)cap != cap) { | |
479 | dev_warn(&vdev->dev, "Capacity %llu too large: truncating\n", | |
480 | (unsigned long long)cap); | |
481 | cap = (sector_t)-1; | |
482 | } | |
483 | set_capacity(vblk->disk, cap); | |
484 | ||
0864b79a | 485 | /* We can handle whatever the host told us to handle. */ |
ee714f2d | 486 | blk_queue_max_segments(q, vblk->sg_elems-2); |
0864b79a | 487 | |
4eff3cae | 488 | /* No need to bounce any requests */ |
69740c8b | 489 | blk_queue_bounce_limit(q, BLK_BOUNCE_ANY); |
4eff3cae | 490 | |
4b7f7e20 | 491 | /* No real sector limit. */ |
ee714f2d | 492 | blk_queue_max_hw_sectors(q, -1U); |
4b7f7e20 | 493 | |
a586d4f6 RR |
494 | /* Host can optionally specify maximum segment size and number of |
495 | * segments. */ | |
496 | err = virtio_config_val(vdev, VIRTIO_BLK_F_SIZE_MAX, | |
497 | offsetof(struct virtio_blk_config, size_max), | |
498 | &v); | |
e467cde2 | 499 | if (!err) |
69740c8b | 500 | blk_queue_max_segment_size(q, v); |
4b7f7e20 | 501 | else |
69740c8b | 502 | blk_queue_max_segment_size(q, -1U); |
e467cde2 | 503 | |
066f4d82 CB |
504 | /* Host can optionally specify the block size of the device */ |
505 | err = virtio_config_val(vdev, VIRTIO_BLK_F_BLK_SIZE, | |
506 | offsetof(struct virtio_blk_config, blk_size), | |
507 | &blk_size); | |
508 | if (!err) | |
69740c8b CH |
509 | blk_queue_logical_block_size(q, blk_size); |
510 | else | |
511 | blk_size = queue_logical_block_size(q); | |
512 | ||
513 | /* Use topology information if available */ | |
514 | err = virtio_config_val(vdev, VIRTIO_BLK_F_TOPOLOGY, | |
515 | offsetof(struct virtio_blk_config, physical_block_exp), | |
516 | &physical_block_exp); | |
517 | if (!err && physical_block_exp) | |
518 | blk_queue_physical_block_size(q, | |
519 | blk_size * (1 << physical_block_exp)); | |
520 | ||
521 | err = virtio_config_val(vdev, VIRTIO_BLK_F_TOPOLOGY, | |
522 | offsetof(struct virtio_blk_config, alignment_offset), | |
523 | &alignment_offset); | |
524 | if (!err && alignment_offset) | |
525 | blk_queue_alignment_offset(q, blk_size * alignment_offset); | |
526 | ||
527 | err = virtio_config_val(vdev, VIRTIO_BLK_F_TOPOLOGY, | |
528 | offsetof(struct virtio_blk_config, min_io_size), | |
529 | &min_io_size); | |
530 | if (!err && min_io_size) | |
531 | blk_queue_io_min(q, blk_size * min_io_size); | |
532 | ||
533 | err = virtio_config_val(vdev, VIRTIO_BLK_F_TOPOLOGY, | |
534 | offsetof(struct virtio_blk_config, opt_io_size), | |
535 | &opt_io_size); | |
536 | if (!err && opt_io_size) | |
537 | blk_queue_io_opt(q, blk_size * opt_io_size); | |
538 | ||
066f4d82 | 539 | |
e467cde2 | 540 | add_disk(vblk->disk); |
a5eb9e4f RH |
541 | err = device_create_file(disk_to_dev(vblk->disk), &dev_attr_serial); |
542 | if (err) | |
543 | goto out_del_disk; | |
544 | ||
e467cde2 RR |
545 | return 0; |
546 | ||
a5eb9e4f RH |
547 | out_del_disk: |
548 | del_gendisk(vblk->disk); | |
549 | blk_cleanup_queue(vblk->disk->queue); | |
e467cde2 RR |
550 | out_put_disk: |
551 | put_disk(vblk->disk); | |
e467cde2 RR |
552 | out_mempool: |
553 | mempool_destroy(vblk->pool); | |
554 | out_free_vq: | |
d2a7ddda | 555 | vdev->config->del_vqs(vdev); |
e467cde2 RR |
556 | out_free_vblk: |
557 | kfree(vblk); | |
5087a50e MT |
558 | out_free_index: |
559 | ida_simple_remove(&vd_index_ida, index); | |
e467cde2 RR |
560 | out: |
561 | return err; | |
562 | } | |
563 | ||
98e94444 | 564 | static void __devexit virtblk_remove(struct virtio_device *vdev) |
e467cde2 RR |
565 | { |
566 | struct virtio_blk *vblk = vdev->priv; | |
5087a50e | 567 | int index = vblk->index; |
e467cde2 | 568 | |
4678d6f9 MT |
569 | /* Prevent config work handler from accessing the device. */ |
570 | mutex_lock(&vblk->config_lock); | |
571 | vblk->config_enable = false; | |
572 | mutex_unlock(&vblk->config_lock); | |
7a7c924c | 573 | |
6e5aa7ef | 574 | /* Nothing should be pending. */ |
e467cde2 | 575 | BUG_ON(!list_empty(&vblk->reqs)); |
6e5aa7ef RR |
576 | |
577 | /* Stop all the virtqueues. */ | |
578 | vdev->config->reset(vdev); | |
579 | ||
4678d6f9 MT |
580 | flush_work(&vblk->config_work); |
581 | ||
ac9d463a | 582 | del_gendisk(vblk->disk); |
e467cde2 RR |
583 | blk_cleanup_queue(vblk->disk->queue); |
584 | put_disk(vblk->disk); | |
e467cde2 | 585 | mempool_destroy(vblk->pool); |
d2a7ddda | 586 | vdev->config->del_vqs(vdev); |
e467cde2 | 587 | kfree(vblk); |
5087a50e | 588 | ida_simple_remove(&vd_index_ida, index); |
e467cde2 RR |
589 | } |
590 | ||
f8fb5bc2 AS |
591 | #ifdef CONFIG_PM |
592 | static int virtblk_freeze(struct virtio_device *vdev) | |
593 | { | |
594 | struct virtio_blk *vblk = vdev->priv; | |
595 | ||
596 | /* Ensure we don't receive any more interrupts */ | |
597 | vdev->config->reset(vdev); | |
598 | ||
599 | /* Prevent config work handler from accessing the device. */ | |
600 | mutex_lock(&vblk->config_lock); | |
601 | vblk->config_enable = false; | |
602 | mutex_unlock(&vblk->config_lock); | |
603 | ||
604 | flush_work(&vblk->config_work); | |
605 | ||
606 | spin_lock_irq(vblk->disk->queue->queue_lock); | |
607 | blk_stop_queue(vblk->disk->queue); | |
608 | spin_unlock_irq(vblk->disk->queue->queue_lock); | |
609 | blk_sync_queue(vblk->disk->queue); | |
610 | ||
611 | vdev->config->del_vqs(vdev); | |
612 | return 0; | |
613 | } | |
614 | ||
615 | static int virtblk_restore(struct virtio_device *vdev) | |
616 | { | |
617 | struct virtio_blk *vblk = vdev->priv; | |
618 | int ret; | |
619 | ||
620 | vblk->config_enable = true; | |
621 | ret = init_vq(vdev->priv); | |
622 | if (!ret) { | |
623 | spin_lock_irq(vblk->disk->queue->queue_lock); | |
624 | blk_start_queue(vblk->disk->queue); | |
625 | spin_unlock_irq(vblk->disk->queue->queue_lock); | |
626 | } | |
627 | return ret; | |
628 | } | |
629 | #endif | |
630 | ||
47483e25 | 631 | static const struct virtio_device_id id_table[] = { |
e467cde2 RR |
632 | { VIRTIO_ID_BLOCK, VIRTIO_DEV_ANY_ID }, |
633 | { 0 }, | |
634 | }; | |
635 | ||
c45a6816 | 636 | static unsigned int features[] = { |
02c42b7a TH |
637 | VIRTIO_BLK_F_SEG_MAX, VIRTIO_BLK_F_SIZE_MAX, VIRTIO_BLK_F_GEOMETRY, |
638 | VIRTIO_BLK_F_RO, VIRTIO_BLK_F_BLK_SIZE, VIRTIO_BLK_F_SCSI, | |
639 | VIRTIO_BLK_F_FLUSH, VIRTIO_BLK_F_TOPOLOGY | |
c45a6816 RR |
640 | }; |
641 | ||
4fbfff76 RM |
642 | /* |
643 | * virtio_blk causes spurious section mismatch warning by | |
644 | * simultaneously referring to a __devinit and a __devexit function. | |
645 | * Use __refdata to avoid this warning. | |
646 | */ | |
647 | static struct virtio_driver __refdata virtio_blk = { | |
7a7c924c CH |
648 | .feature_table = features, |
649 | .feature_table_size = ARRAY_SIZE(features), | |
650 | .driver.name = KBUILD_MODNAME, | |
651 | .driver.owner = THIS_MODULE, | |
652 | .id_table = id_table, | |
653 | .probe = virtblk_probe, | |
654 | .remove = __devexit_p(virtblk_remove), | |
655 | .config_changed = virtblk_config_changed, | |
f8fb5bc2 AS |
656 | #ifdef CONFIG_PM |
657 | .freeze = virtblk_freeze, | |
658 | .restore = virtblk_restore, | |
659 | #endif | |
e467cde2 RR |
660 | }; |
661 | ||
662 | static int __init init(void) | |
663 | { | |
7a7c924c CH |
664 | int error; |
665 | ||
666 | virtblk_wq = alloc_workqueue("virtio-blk", 0, 0); | |
667 | if (!virtblk_wq) | |
668 | return -ENOMEM; | |
669 | ||
4f3bf19c | 670 | major = register_blkdev(0, "virtblk"); |
7a7c924c CH |
671 | if (major < 0) { |
672 | error = major; | |
673 | goto out_destroy_workqueue; | |
674 | } | |
675 | ||
676 | error = register_virtio_driver(&virtio_blk); | |
677 | if (error) | |
678 | goto out_unregister_blkdev; | |
679 | return 0; | |
680 | ||
681 | out_unregister_blkdev: | |
682 | unregister_blkdev(major, "virtblk"); | |
683 | out_destroy_workqueue: | |
684 | destroy_workqueue(virtblk_wq); | |
685 | return error; | |
e467cde2 RR |
686 | } |
687 | ||
688 | static void __exit fini(void) | |
689 | { | |
4f3bf19c | 690 | unregister_blkdev(major, "virtblk"); |
e467cde2 | 691 | unregister_virtio_driver(&virtio_blk); |
7a7c924c | 692 | destroy_workqueue(virtblk_wq); |
e467cde2 RR |
693 | } |
694 | module_init(init); | |
695 | module_exit(fini); | |
696 | ||
697 | MODULE_DEVICE_TABLE(virtio, id_table); | |
698 | MODULE_DESCRIPTION("Virtio block driver"); | |
699 | MODULE_LICENSE("GPL"); |