2 #include <linux/spinlock.h>
3 #include <linux/slab.h>
4 #include <linux/blkdev.h>
5 #include <linux/hdreg.h>
6 #include <linux/module.h>
7 #include <linux/mutex.h>
8 #include <linux/virtio.h>
9 #include <linux/virtio_blk.h>
10 #include <linux/scatterlist.h>
11 #include <linux/string_helpers.h>
12 #include <scsi/scsi_cmnd.h>
13 #include <linux/idr.h>
14 #include <linux/blk-mq.h>
15 #include <linux/numa.h>
18 #define VQ_NAME_LEN 16
21 static DEFINE_IDA(vd_index_ida);
23 static struct workqueue_struct *virtblk_wq;
25 struct virtio_blk_vq {
28 char name[VQ_NAME_LEN];
29 } ____cacheline_aligned_in_smp;
33 struct virtio_device *vdev;
35 /* The disk structure for the kernel. */
38 /* Block layer tags. */
39 struct blk_mq_tag_set tag_set;
41 /* Process context for config space updates */
42 struct work_struct config_work;
44 /* What host tells us, plus 2 for header & tailer. */
45 unsigned int sg_elems;
47 /* Ida index - used to track minor number allocations. */
52 struct virtio_blk_vq *vqs;
58 struct virtio_blk_outhdr out_hdr;
59 struct virtio_scsi_inhdr in_hdr;
61 struct scatterlist sg[];
64 static inline int virtblk_result(struct virtblk_req *vbr)
66 switch (vbr->status) {
69 case VIRTIO_BLK_S_UNSUPP:
76 static int __virtblk_add_req(struct virtqueue *vq,
77 struct virtblk_req *vbr,
78 struct scatterlist *data_sg,
81 struct scatterlist hdr, status, cmd, sense, inhdr, *sgs[6];
82 unsigned int num_out = 0, num_in = 0;
83 int type = vbr->out_hdr.type & ~VIRTIO_BLK_T_OUT;
85 sg_init_one(&hdr, &vbr->out_hdr, sizeof(vbr->out_hdr));
86 sgs[num_out++] = &hdr;
89 * If this is a packet command we need a couple of additional headers.
90 * Behind the normal outhdr we put a segment with the scsi command
91 * block, and before the normal inhdr we put the sense data and the
92 * inhdr with additional status information.
94 if (type == VIRTIO_BLK_T_SCSI_CMD) {
95 sg_init_one(&cmd, vbr->req->cmd, vbr->req->cmd_len);
96 sgs[num_out++] = &cmd;
100 if (vbr->out_hdr.type & VIRTIO_BLK_T_OUT)
101 sgs[num_out++] = data_sg;
103 sgs[num_out + num_in++] = data_sg;
106 if (type == VIRTIO_BLK_T_SCSI_CMD) {
107 sg_init_one(&sense, vbr->req->sense, SCSI_SENSE_BUFFERSIZE);
108 sgs[num_out + num_in++] = &sense;
109 sg_init_one(&inhdr, &vbr->in_hdr, sizeof(vbr->in_hdr));
110 sgs[num_out + num_in++] = &inhdr;
113 sg_init_one(&status, &vbr->status, sizeof(vbr->status));
114 sgs[num_out + num_in++] = &status;
116 return virtqueue_add_sgs(vq, sgs, num_out, num_in, vbr, GFP_ATOMIC);
119 static inline void virtblk_request_done(struct request *req)
121 struct virtblk_req *vbr = blk_mq_rq_to_pdu(req);
122 int error = virtblk_result(vbr);
124 if (req->cmd_type == REQ_TYPE_BLOCK_PC) {
125 req->resid_len = vbr->in_hdr.residual;
126 req->sense_len = vbr->in_hdr.sense_len;
127 req->errors = vbr->in_hdr.errors;
128 } else if (req->cmd_type == REQ_TYPE_SPECIAL) {
129 req->errors = (error != 0);
132 blk_mq_end_io(req, error);
135 static void virtblk_done(struct virtqueue *vq)
137 struct virtio_blk *vblk = vq->vdev->priv;
138 bool req_done = false;
140 struct virtblk_req *vbr;
144 spin_lock_irqsave(&vblk->vqs[qid].lock, flags);
146 virtqueue_disable_cb(vq);
147 while ((vbr = virtqueue_get_buf(vblk->vqs[qid].vq, &len)) != NULL) {
148 blk_mq_complete_request(vbr->req);
151 if (unlikely(virtqueue_is_broken(vq)))
153 } while (!virtqueue_enable_cb(vq));
155 /* In case queue is stopped waiting for more buffers. */
157 blk_mq_start_stopped_hw_queues(vblk->disk->queue, true);
158 spin_unlock_irqrestore(&vblk->vqs[qid].lock, flags);
161 static int virtio_queue_rq(struct blk_mq_hw_ctx *hctx, struct request *req)
163 struct virtio_blk *vblk = hctx->queue->queuedata;
164 struct virtblk_req *vbr = blk_mq_rq_to_pdu(req);
167 int qid = hctx->queue_num;
168 const bool last = (req->cmd_flags & REQ_END) != 0;
172 BUG_ON(req->nr_phys_segments + 2 > vblk->sg_elems);
175 if (req->cmd_flags & REQ_FLUSH) {
176 vbr->out_hdr.type = VIRTIO_BLK_T_FLUSH;
177 vbr->out_hdr.sector = 0;
178 vbr->out_hdr.ioprio = req_get_ioprio(vbr->req);
180 switch (req->cmd_type) {
182 vbr->out_hdr.type = 0;
183 vbr->out_hdr.sector = blk_rq_pos(vbr->req);
184 vbr->out_hdr.ioprio = req_get_ioprio(vbr->req);
186 case REQ_TYPE_BLOCK_PC:
187 vbr->out_hdr.type = VIRTIO_BLK_T_SCSI_CMD;
188 vbr->out_hdr.sector = 0;
189 vbr->out_hdr.ioprio = req_get_ioprio(vbr->req);
191 case REQ_TYPE_SPECIAL:
192 vbr->out_hdr.type = VIRTIO_BLK_T_GET_ID;
193 vbr->out_hdr.sector = 0;
194 vbr->out_hdr.ioprio = req_get_ioprio(vbr->req);
197 /* We don't put anything else in the queue. */
202 num = blk_rq_map_sg(hctx->queue, vbr->req, vbr->sg);
204 if (rq_data_dir(vbr->req) == WRITE)
205 vbr->out_hdr.type |= VIRTIO_BLK_T_OUT;
207 vbr->out_hdr.type |= VIRTIO_BLK_T_IN;
210 spin_lock_irqsave(&vblk->vqs[qid].lock, flags);
211 err = __virtblk_add_req(vblk->vqs[qid].vq, vbr, vbr->sg, num);
213 virtqueue_kick(vblk->vqs[qid].vq);
214 blk_mq_stop_hw_queue(hctx);
215 spin_unlock_irqrestore(&vblk->vqs[qid].lock, flags);
216 /* Out of mem doesn't actually happen, since we fall back
217 * to direct descriptors */
218 if (err == -ENOMEM || err == -ENOSPC)
219 return BLK_MQ_RQ_QUEUE_BUSY;
220 return BLK_MQ_RQ_QUEUE_ERROR;
223 if (last && virtqueue_kick_prepare(vblk->vqs[qid].vq))
225 spin_unlock_irqrestore(&vblk->vqs[qid].lock, flags);
228 virtqueue_notify(vblk->vqs[qid].vq);
229 return BLK_MQ_RQ_QUEUE_OK;
232 /* return id (s/n) string for *disk to *id_str
234 static int virtblk_get_id(struct gendisk *disk, char *id_str)
236 struct virtio_blk *vblk = disk->private_data;
241 bio = bio_map_kern(vblk->disk->queue, id_str, VIRTIO_BLK_ID_BYTES,
246 req = blk_make_request(vblk->disk->queue, bio, GFP_KERNEL);
252 req->cmd_type = REQ_TYPE_SPECIAL;
253 err = blk_execute_rq(vblk->disk->queue, vblk->disk, req, false);
254 blk_put_request(req);
259 static int virtblk_ioctl(struct block_device *bdev, fmode_t mode,
260 unsigned int cmd, unsigned long data)
262 struct gendisk *disk = bdev->bd_disk;
263 struct virtio_blk *vblk = disk->private_data;
266 * Only allow the generic SCSI ioctls if the host can support it.
268 if (!virtio_has_feature(vblk->vdev, VIRTIO_BLK_F_SCSI))
271 return scsi_cmd_blk_ioctl(bdev, mode, cmd,
272 (void __user *)data);
275 /* We provide getgeo only to please some old bootloader/partitioning tools */
276 static int virtblk_getgeo(struct block_device *bd, struct hd_geometry *geo)
278 struct virtio_blk *vblk = bd->bd_disk->private_data;
280 /* see if the host passed in geometry config */
281 if (virtio_has_feature(vblk->vdev, VIRTIO_BLK_F_GEOMETRY)) {
282 virtio_cread(vblk->vdev, struct virtio_blk_config,
283 geometry.cylinders, &geo->cylinders);
284 virtio_cread(vblk->vdev, struct virtio_blk_config,
285 geometry.heads, &geo->heads);
286 virtio_cread(vblk->vdev, struct virtio_blk_config,
287 geometry.sectors, &geo->sectors);
289 /* some standard values, similar to sd */
291 geo->sectors = 1 << 5;
292 geo->cylinders = get_capacity(bd->bd_disk) >> 11;
297 static const struct block_device_operations virtblk_fops = {
298 .ioctl = virtblk_ioctl,
299 .owner = THIS_MODULE,
300 .getgeo = virtblk_getgeo,
303 static int index_to_minor(int index)
305 return index << PART_BITS;
308 static int minor_to_index(int minor)
310 return minor >> PART_BITS;
313 static ssize_t virtblk_serial_show(struct device *dev,
314 struct device_attribute *attr, char *buf)
316 struct gendisk *disk = dev_to_disk(dev);
319 /* sysfs gives us a PAGE_SIZE buffer */
320 BUILD_BUG_ON(PAGE_SIZE < VIRTIO_BLK_ID_BYTES);
322 buf[VIRTIO_BLK_ID_BYTES] = '\0';
323 err = virtblk_get_id(disk, buf);
327 if (err == -EIO) /* Unsupported? Make it empty. */
332 DEVICE_ATTR(serial, S_IRUGO, virtblk_serial_show, NULL);
334 static void virtblk_config_changed_work(struct work_struct *work)
336 struct virtio_blk *vblk =
337 container_of(work, struct virtio_blk, config_work);
338 struct virtio_device *vdev = vblk->vdev;
339 struct request_queue *q = vblk->disk->queue;
340 char cap_str_2[10], cap_str_10[10];
341 char *envp[] = { "RESIZE=1", NULL };
344 /* Host must always specify the capacity. */
345 virtio_cread(vdev, struct virtio_blk_config, capacity, &capacity);
347 /* If capacity is too big, truncate with warning. */
348 if ((sector_t)capacity != capacity) {
349 dev_warn(&vdev->dev, "Capacity %llu too large: truncating\n",
350 (unsigned long long)capacity);
351 capacity = (sector_t)-1;
354 size = capacity * queue_logical_block_size(q);
355 string_get_size(size, STRING_UNITS_2, cap_str_2, sizeof(cap_str_2));
356 string_get_size(size, STRING_UNITS_10, cap_str_10, sizeof(cap_str_10));
358 dev_notice(&vdev->dev,
359 "new size: %llu %d-byte logical blocks (%s/%s)\n",
360 (unsigned long long)capacity,
361 queue_logical_block_size(q),
362 cap_str_10, cap_str_2);
364 set_capacity(vblk->disk, capacity);
365 revalidate_disk(vblk->disk);
366 kobject_uevent_env(&disk_to_dev(vblk->disk)->kobj, KOBJ_CHANGE, envp);
369 static void virtblk_config_changed(struct virtio_device *vdev)
371 struct virtio_blk *vblk = vdev->priv;
373 queue_work(virtblk_wq, &vblk->config_work);
376 static int init_vq(struct virtio_blk *vblk)
380 vq_callback_t **callbacks;
382 struct virtqueue **vqs;
383 unsigned short num_vqs;
384 struct virtio_device *vdev = vblk->vdev;
386 err = virtio_cread_feature(vdev, VIRTIO_BLK_F_MQ,
387 struct virtio_blk_config, num_queues,
392 vblk->vqs = kmalloc(sizeof(*vblk->vqs) * num_vqs, GFP_KERNEL);
398 names = kmalloc(sizeof(*names) * num_vqs, GFP_KERNEL);
402 callbacks = kmalloc(sizeof(*callbacks) * num_vqs, GFP_KERNEL);
406 vqs = kmalloc(sizeof(*vqs) * num_vqs, GFP_KERNEL);
410 for (i = 0; i < num_vqs; i++) {
411 callbacks[i] = virtblk_done;
412 snprintf(vblk->vqs[i].name, VQ_NAME_LEN, "req.%d", i);
413 names[i] = vblk->vqs[i].name;
416 /* Discover virtqueues and write information to configuration. */
417 err = vdev->config->find_vqs(vdev, num_vqs, vqs, callbacks, names);
421 for (i = 0; i < num_vqs; i++) {
422 spin_lock_init(&vblk->vqs[i].lock);
423 vblk->vqs[i].vq = vqs[i];
425 vblk->num_vqs = num_vqs;
441 * Legacy naming scheme used for virtio devices. We are stuck with it for
442 * virtio blk but don't ever use it for any new driver.
444 static int virtblk_name_format(char *prefix, int index, char *buf, int buflen)
446 const int base = 'z' - 'a' + 1;
447 char *begin = buf + strlen(prefix);
448 char *end = buf + buflen;
458 *--p = 'a' + (index % unit);
459 index = (index / unit) - 1;
460 } while (index >= 0);
462 memmove(begin, p, end - p);
463 memcpy(buf, prefix, strlen(prefix));
468 static int virtblk_get_cache_mode(struct virtio_device *vdev)
473 err = virtio_cread_feature(vdev, VIRTIO_BLK_F_CONFIG_WCE,
474 struct virtio_blk_config, wce,
477 writeback = virtio_has_feature(vdev, VIRTIO_BLK_F_WCE);
482 static void virtblk_update_cache_mode(struct virtio_device *vdev)
484 u8 writeback = virtblk_get_cache_mode(vdev);
485 struct virtio_blk *vblk = vdev->priv;
488 blk_queue_flush(vblk->disk->queue, REQ_FLUSH);
490 blk_queue_flush(vblk->disk->queue, 0);
492 revalidate_disk(vblk->disk);
495 static const char *const virtblk_cache_types[] = {
496 "write through", "write back"
500 virtblk_cache_type_store(struct device *dev, struct device_attribute *attr,
501 const char *buf, size_t count)
503 struct gendisk *disk = dev_to_disk(dev);
504 struct virtio_blk *vblk = disk->private_data;
505 struct virtio_device *vdev = vblk->vdev;
508 BUG_ON(!virtio_has_feature(vblk->vdev, VIRTIO_BLK_F_CONFIG_WCE));
509 for (i = ARRAY_SIZE(virtblk_cache_types); --i >= 0; )
510 if (sysfs_streq(buf, virtblk_cache_types[i]))
516 virtio_cwrite8(vdev, offsetof(struct virtio_blk_config, wce), i);
517 virtblk_update_cache_mode(vdev);
522 virtblk_cache_type_show(struct device *dev, struct device_attribute *attr,
525 struct gendisk *disk = dev_to_disk(dev);
526 struct virtio_blk *vblk = disk->private_data;
527 u8 writeback = virtblk_get_cache_mode(vblk->vdev);
529 BUG_ON(writeback >= ARRAY_SIZE(virtblk_cache_types));
530 return snprintf(buf, 40, "%s\n", virtblk_cache_types[writeback]);
533 static const struct device_attribute dev_attr_cache_type_ro =
534 __ATTR(cache_type, S_IRUGO,
535 virtblk_cache_type_show, NULL);
536 static const struct device_attribute dev_attr_cache_type_rw =
537 __ATTR(cache_type, S_IRUGO|S_IWUSR,
538 virtblk_cache_type_show, virtblk_cache_type_store);
540 static int virtblk_init_request(void *data, struct request *rq,
541 unsigned int hctx_idx, unsigned int request_idx,
542 unsigned int numa_node)
544 struct virtio_blk *vblk = data;
545 struct virtblk_req *vbr = blk_mq_rq_to_pdu(rq);
547 sg_init_table(vbr->sg, vblk->sg_elems);
551 static struct blk_mq_ops virtio_mq_ops = {
552 .queue_rq = virtio_queue_rq,
553 .map_queue = blk_mq_map_queue,
554 .complete = virtblk_request_done,
555 .init_request = virtblk_init_request,
558 static unsigned int virtblk_queue_depth;
559 module_param_named(queue_depth, virtblk_queue_depth, uint, 0444);
561 static int virtblk_probe(struct virtio_device *vdev)
563 struct virtio_blk *vblk;
564 struct request_queue *q;
568 u32 v, blk_size, sg_elems, opt_io_size;
570 u8 physical_block_exp, alignment_offset;
572 err = ida_simple_get(&vd_index_ida, 0, minor_to_index(1 << MINORBITS),
578 /* We need to know how many segments before we allocate. */
579 err = virtio_cread_feature(vdev, VIRTIO_BLK_F_SEG_MAX,
580 struct virtio_blk_config, seg_max,
583 /* We need at least one SG element, whatever they say. */
584 if (err || !sg_elems)
587 /* We need an extra sg elements at head and tail. */
589 vdev->priv = vblk = kmalloc(sizeof(*vblk), GFP_KERNEL);
596 vblk->sg_elems = sg_elems;
598 INIT_WORK(&vblk->config_work, virtblk_config_changed_work);
604 /* FIXME: How many partitions? How long is a piece of string? */
605 vblk->disk = alloc_disk(1 << PART_BITS);
611 /* Default queue sizing is to fill the ring. */
612 if (!virtblk_queue_depth) {
613 virtblk_queue_depth = vblk->vqs[0].vq->num_free;
614 /* ... but without indirect descs, we use 2 descs per req */
615 if (!virtio_has_feature(vdev, VIRTIO_RING_F_INDIRECT_DESC))
616 virtblk_queue_depth /= 2;
619 memset(&vblk->tag_set, 0, sizeof(vblk->tag_set));
620 vblk->tag_set.ops = &virtio_mq_ops;
621 vblk->tag_set.queue_depth = virtblk_queue_depth;
622 vblk->tag_set.numa_node = NUMA_NO_NODE;
623 vblk->tag_set.flags = BLK_MQ_F_SHOULD_MERGE;
624 vblk->tag_set.cmd_size =
625 sizeof(struct virtblk_req) +
626 sizeof(struct scatterlist) * sg_elems;
627 vblk->tag_set.driver_data = vblk;
628 vblk->tag_set.nr_hw_queues = vblk->num_vqs;
630 err = blk_mq_alloc_tag_set(&vblk->tag_set);
634 q = vblk->disk->queue = blk_mq_init_queue(&vblk->tag_set);
642 virtblk_name_format("vd", index, vblk->disk->disk_name, DISK_NAME_LEN);
644 vblk->disk->major = major;
645 vblk->disk->first_minor = index_to_minor(index);
646 vblk->disk->private_data = vblk;
647 vblk->disk->fops = &virtblk_fops;
648 vblk->disk->driverfs_dev = &vdev->dev;
651 /* configure queue flush support */
652 virtblk_update_cache_mode(vdev);
654 /* If disk is read-only in the host, the guest should obey */
655 if (virtio_has_feature(vdev, VIRTIO_BLK_F_RO))
656 set_disk_ro(vblk->disk, 1);
658 /* Host must always specify the capacity. */
659 virtio_cread(vdev, struct virtio_blk_config, capacity, &cap);
661 /* If capacity is too big, truncate with warning. */
662 if ((sector_t)cap != cap) {
663 dev_warn(&vdev->dev, "Capacity %llu too large: truncating\n",
664 (unsigned long long)cap);
667 set_capacity(vblk->disk, cap);
669 /* We can handle whatever the host told us to handle. */
670 blk_queue_max_segments(q, vblk->sg_elems-2);
672 /* No need to bounce any requests */
673 blk_queue_bounce_limit(q, BLK_BOUNCE_ANY);
675 /* No real sector limit. */
676 blk_queue_max_hw_sectors(q, -1U);
678 /* Host can optionally specify maximum segment size and number of
680 err = virtio_cread_feature(vdev, VIRTIO_BLK_F_SIZE_MAX,
681 struct virtio_blk_config, size_max, &v);
683 blk_queue_max_segment_size(q, v);
685 blk_queue_max_segment_size(q, -1U);
687 /* Host can optionally specify the block size of the device */
688 err = virtio_cread_feature(vdev, VIRTIO_BLK_F_BLK_SIZE,
689 struct virtio_blk_config, blk_size,
692 blk_queue_logical_block_size(q, blk_size);
694 blk_size = queue_logical_block_size(q);
696 /* Use topology information if available */
697 err = virtio_cread_feature(vdev, VIRTIO_BLK_F_TOPOLOGY,
698 struct virtio_blk_config, physical_block_exp,
699 &physical_block_exp);
700 if (!err && physical_block_exp)
701 blk_queue_physical_block_size(q,
702 blk_size * (1 << physical_block_exp));
704 err = virtio_cread_feature(vdev, VIRTIO_BLK_F_TOPOLOGY,
705 struct virtio_blk_config, alignment_offset,
707 if (!err && alignment_offset)
708 blk_queue_alignment_offset(q, blk_size * alignment_offset);
710 err = virtio_cread_feature(vdev, VIRTIO_BLK_F_TOPOLOGY,
711 struct virtio_blk_config, min_io_size,
713 if (!err && min_io_size)
714 blk_queue_io_min(q, blk_size * min_io_size);
716 err = virtio_cread_feature(vdev, VIRTIO_BLK_F_TOPOLOGY,
717 struct virtio_blk_config, opt_io_size,
719 if (!err && opt_io_size)
720 blk_queue_io_opt(q, blk_size * opt_io_size);
722 virtio_device_ready(vdev);
724 add_disk(vblk->disk);
725 err = device_create_file(disk_to_dev(vblk->disk), &dev_attr_serial);
729 if (virtio_has_feature(vdev, VIRTIO_BLK_F_CONFIG_WCE))
730 err = device_create_file(disk_to_dev(vblk->disk),
731 &dev_attr_cache_type_rw);
733 err = device_create_file(disk_to_dev(vblk->disk),
734 &dev_attr_cache_type_ro);
740 del_gendisk(vblk->disk);
741 blk_cleanup_queue(vblk->disk->queue);
743 blk_mq_free_tag_set(&vblk->tag_set);
745 put_disk(vblk->disk);
747 vdev->config->del_vqs(vdev);
751 ida_simple_remove(&vd_index_ida, index);
756 static void virtblk_remove(struct virtio_device *vdev)
758 struct virtio_blk *vblk = vdev->priv;
759 int index = vblk->index;
762 /* Make sure no work handler is accessing the device. */
763 flush_work(&vblk->config_work);
765 del_gendisk(vblk->disk);
766 blk_cleanup_queue(vblk->disk->queue);
768 blk_mq_free_tag_set(&vblk->tag_set);
770 /* Stop all the virtqueues. */
771 vdev->config->reset(vdev);
773 refc = atomic_read(&disk_to_dev(vblk->disk)->kobj.kref.refcount);
774 put_disk(vblk->disk);
775 vdev->config->del_vqs(vdev);
779 /* Only free device id if we don't have any users */
781 ida_simple_remove(&vd_index_ida, index);
784 #ifdef CONFIG_PM_SLEEP
785 static int virtblk_freeze(struct virtio_device *vdev)
787 struct virtio_blk *vblk = vdev->priv;
789 /* Ensure we don't receive any more interrupts */
790 vdev->config->reset(vdev);
792 /* Make sure no work handler is accessing the device. */
793 flush_work(&vblk->config_work);
795 blk_mq_stop_hw_queues(vblk->disk->queue);
797 vdev->config->del_vqs(vdev);
801 static int virtblk_restore(struct virtio_device *vdev)
803 struct virtio_blk *vblk = vdev->priv;
806 ret = init_vq(vdev->priv);
810 virtio_device_ready(vdev);
812 blk_mq_start_stopped_hw_queues(vblk->disk->queue, true);
817 static const struct virtio_device_id id_table[] = {
818 { VIRTIO_ID_BLOCK, VIRTIO_DEV_ANY_ID },
822 static unsigned int features[] = {
823 VIRTIO_BLK_F_SEG_MAX, VIRTIO_BLK_F_SIZE_MAX, VIRTIO_BLK_F_GEOMETRY,
824 VIRTIO_BLK_F_RO, VIRTIO_BLK_F_BLK_SIZE, VIRTIO_BLK_F_SCSI,
825 VIRTIO_BLK_F_WCE, VIRTIO_BLK_F_TOPOLOGY, VIRTIO_BLK_F_CONFIG_WCE,
829 static struct virtio_driver virtio_blk = {
830 .feature_table = features,
831 .feature_table_size = ARRAY_SIZE(features),
832 .driver.name = KBUILD_MODNAME,
833 .driver.owner = THIS_MODULE,
834 .id_table = id_table,
835 .probe = virtblk_probe,
836 .remove = virtblk_remove,
837 .config_changed = virtblk_config_changed,
838 #ifdef CONFIG_PM_SLEEP
839 .freeze = virtblk_freeze,
840 .restore = virtblk_restore,
844 static int __init init(void)
848 virtblk_wq = alloc_workqueue("virtio-blk", 0, 0);
852 major = register_blkdev(0, "virtblk");
855 goto out_destroy_workqueue;
858 error = register_virtio_driver(&virtio_blk);
860 goto out_unregister_blkdev;
863 out_unregister_blkdev:
864 unregister_blkdev(major, "virtblk");
865 out_destroy_workqueue:
866 destroy_workqueue(virtblk_wq);
870 static void __exit fini(void)
872 unregister_blkdev(major, "virtblk");
873 unregister_virtio_driver(&virtio_blk);
874 destroy_workqueue(virtblk_wq);
879 MODULE_DEVICE_TABLE(virtio, id_table);
880 MODULE_DESCRIPTION("Virtio block driver");
881 MODULE_LICENSE("GPL");