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 __virtio32 type = vbr->out_hdr.type & ~cpu_to_virtio32(vq->vdev, 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 == cpu_to_virtio32(vq->vdev, 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 & cpu_to_virtio32(vq->vdev, VIRTIO_BLK_T_OUT))
101 sgs[num_out++] = data_sg;
103 sgs[num_out + num_in++] = data_sg;
106 if (type == cpu_to_virtio32(vq->vdev, 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 struct virtio_blk *vblk = req->q->queuedata;
123 int error = virtblk_result(vbr);
125 if (req->cmd_type == REQ_TYPE_BLOCK_PC) {
126 req->resid_len = virtio32_to_cpu(vblk->vdev, vbr->in_hdr.residual);
127 req->sense_len = virtio32_to_cpu(vblk->vdev, vbr->in_hdr.sense_len);
128 req->errors = virtio32_to_cpu(vblk->vdev, vbr->in_hdr.errors);
129 } else if (req->cmd_type == REQ_TYPE_SPECIAL) {
130 req->errors = (error != 0);
133 blk_mq_end_request(req, error);
136 static void virtblk_done(struct virtqueue *vq)
138 struct virtio_blk *vblk = vq->vdev->priv;
139 bool req_done = false;
141 struct virtblk_req *vbr;
145 spin_lock_irqsave(&vblk->vqs[qid].lock, flags);
147 virtqueue_disable_cb(vq);
148 while ((vbr = virtqueue_get_buf(vblk->vqs[qid].vq, &len)) != NULL) {
149 blk_mq_complete_request(vbr->req);
152 if (unlikely(virtqueue_is_broken(vq)))
154 } while (!virtqueue_enable_cb(vq));
156 /* In case queue is stopped waiting for more buffers. */
158 blk_mq_start_stopped_hw_queues(vblk->disk->queue, true);
159 spin_unlock_irqrestore(&vblk->vqs[qid].lock, flags);
162 static int virtio_queue_rq(struct blk_mq_hw_ctx *hctx,
163 const struct blk_mq_queue_data *bd)
165 struct virtio_blk *vblk = hctx->queue->queuedata;
166 struct request *req = bd->rq;
167 struct virtblk_req *vbr = blk_mq_rq_to_pdu(req);
170 int qid = hctx->queue_num;
174 BUG_ON(req->nr_phys_segments + 2 > vblk->sg_elems);
177 if (req->cmd_flags & REQ_FLUSH) {
178 vbr->out_hdr.type = cpu_to_virtio32(vblk->vdev, VIRTIO_BLK_T_FLUSH);
179 vbr->out_hdr.sector = 0;
180 vbr->out_hdr.ioprio = cpu_to_virtio32(vblk->vdev, req_get_ioprio(vbr->req));
182 switch (req->cmd_type) {
184 vbr->out_hdr.type = 0;
185 vbr->out_hdr.sector = cpu_to_virtio64(vblk->vdev, blk_rq_pos(vbr->req));
186 vbr->out_hdr.ioprio = cpu_to_virtio32(vblk->vdev, req_get_ioprio(vbr->req));
188 case REQ_TYPE_BLOCK_PC:
189 vbr->out_hdr.type = cpu_to_virtio32(vblk->vdev, VIRTIO_BLK_T_SCSI_CMD);
190 vbr->out_hdr.sector = 0;
191 vbr->out_hdr.ioprio = cpu_to_virtio32(vblk->vdev, req_get_ioprio(vbr->req));
193 case REQ_TYPE_SPECIAL:
194 vbr->out_hdr.type = cpu_to_virtio32(vblk->vdev, VIRTIO_BLK_T_GET_ID);
195 vbr->out_hdr.sector = 0;
196 vbr->out_hdr.ioprio = cpu_to_virtio32(vblk->vdev, req_get_ioprio(vbr->req));
199 /* We don't put anything else in the queue. */
204 blk_mq_start_request(req);
206 num = blk_rq_map_sg(hctx->queue, vbr->req, vbr->sg);
208 if (rq_data_dir(vbr->req) == WRITE)
209 vbr->out_hdr.type |= cpu_to_virtio32(vblk->vdev, VIRTIO_BLK_T_OUT);
211 vbr->out_hdr.type |= cpu_to_virtio32(vblk->vdev, VIRTIO_BLK_T_IN);
214 spin_lock_irqsave(&vblk->vqs[qid].lock, flags);
215 err = __virtblk_add_req(vblk->vqs[qid].vq, vbr, vbr->sg, num);
217 virtqueue_kick(vblk->vqs[qid].vq);
218 blk_mq_stop_hw_queue(hctx);
219 spin_unlock_irqrestore(&vblk->vqs[qid].lock, flags);
220 /* Out of mem doesn't actually happen, since we fall back
221 * to direct descriptors */
222 if (err == -ENOMEM || err == -ENOSPC)
223 return BLK_MQ_RQ_QUEUE_BUSY;
224 return BLK_MQ_RQ_QUEUE_ERROR;
227 if (bd->last && virtqueue_kick_prepare(vblk->vqs[qid].vq))
229 spin_unlock_irqrestore(&vblk->vqs[qid].lock, flags);
232 virtqueue_notify(vblk->vqs[qid].vq);
233 return BLK_MQ_RQ_QUEUE_OK;
236 /* return id (s/n) string for *disk to *id_str
238 static int virtblk_get_id(struct gendisk *disk, char *id_str)
240 struct virtio_blk *vblk = disk->private_data;
245 bio = bio_map_kern(vblk->disk->queue, id_str, VIRTIO_BLK_ID_BYTES,
250 req = blk_make_request(vblk->disk->queue, bio, GFP_KERNEL);
256 req->cmd_type = REQ_TYPE_SPECIAL;
257 err = blk_execute_rq(vblk->disk->queue, vblk->disk, req, false);
258 blk_put_request(req);
263 static int virtblk_ioctl(struct block_device *bdev, fmode_t mode,
264 unsigned int cmd, unsigned long data)
266 struct gendisk *disk = bdev->bd_disk;
267 struct virtio_blk *vblk = disk->private_data;
270 * Only allow the generic SCSI ioctls if the host can support it.
272 if (!virtio_has_feature(vblk->vdev, VIRTIO_BLK_F_SCSI))
275 return scsi_cmd_blk_ioctl(bdev, mode, cmd,
276 (void __user *)data);
279 /* We provide getgeo only to please some old bootloader/partitioning tools */
280 static int virtblk_getgeo(struct block_device *bd, struct hd_geometry *geo)
282 struct virtio_blk *vblk = bd->bd_disk->private_data;
284 /* see if the host passed in geometry config */
285 if (virtio_has_feature(vblk->vdev, VIRTIO_BLK_F_GEOMETRY)) {
286 virtio_cread(vblk->vdev, struct virtio_blk_config,
287 geometry.cylinders, &geo->cylinders);
288 virtio_cread(vblk->vdev, struct virtio_blk_config,
289 geometry.heads, &geo->heads);
290 virtio_cread(vblk->vdev, struct virtio_blk_config,
291 geometry.sectors, &geo->sectors);
293 /* some standard values, similar to sd */
295 geo->sectors = 1 << 5;
296 geo->cylinders = get_capacity(bd->bd_disk) >> 11;
301 static const struct block_device_operations virtblk_fops = {
302 .ioctl = virtblk_ioctl,
303 .owner = THIS_MODULE,
304 .getgeo = virtblk_getgeo,
307 static int index_to_minor(int index)
309 return index << PART_BITS;
312 static int minor_to_index(int minor)
314 return minor >> PART_BITS;
317 static ssize_t virtblk_serial_show(struct device *dev,
318 struct device_attribute *attr, char *buf)
320 struct gendisk *disk = dev_to_disk(dev);
323 /* sysfs gives us a PAGE_SIZE buffer */
324 BUILD_BUG_ON(PAGE_SIZE < VIRTIO_BLK_ID_BYTES);
326 buf[VIRTIO_BLK_ID_BYTES] = '\0';
327 err = virtblk_get_id(disk, buf);
331 if (err == -EIO) /* Unsupported? Make it empty. */
337 static DEVICE_ATTR(serial, S_IRUGO, virtblk_serial_show, NULL);
339 static void virtblk_config_changed_work(struct work_struct *work)
341 struct virtio_blk *vblk =
342 container_of(work, struct virtio_blk, config_work);
343 struct virtio_device *vdev = vblk->vdev;
344 struct request_queue *q = vblk->disk->queue;
345 char cap_str_2[10], cap_str_10[10];
346 char *envp[] = { "RESIZE=1", NULL };
349 /* Host must always specify the capacity. */
350 virtio_cread(vdev, struct virtio_blk_config, capacity, &capacity);
352 /* If capacity is too big, truncate with warning. */
353 if ((sector_t)capacity != capacity) {
354 dev_warn(&vdev->dev, "Capacity %llu too large: truncating\n",
355 (unsigned long long)capacity);
356 capacity = (sector_t)-1;
359 size = capacity * queue_logical_block_size(q);
360 string_get_size(size, STRING_UNITS_2, cap_str_2, sizeof(cap_str_2));
361 string_get_size(size, STRING_UNITS_10, cap_str_10, sizeof(cap_str_10));
363 dev_notice(&vdev->dev,
364 "new size: %llu %d-byte logical blocks (%s/%s)\n",
365 (unsigned long long)capacity,
366 queue_logical_block_size(q),
367 cap_str_10, cap_str_2);
369 set_capacity(vblk->disk, capacity);
370 revalidate_disk(vblk->disk);
371 kobject_uevent_env(&disk_to_dev(vblk->disk)->kobj, KOBJ_CHANGE, envp);
374 static void virtblk_config_changed(struct virtio_device *vdev)
376 struct virtio_blk *vblk = vdev->priv;
378 queue_work(virtblk_wq, &vblk->config_work);
381 static int init_vq(struct virtio_blk *vblk)
385 vq_callback_t **callbacks;
387 struct virtqueue **vqs;
388 unsigned short num_vqs;
389 struct virtio_device *vdev = vblk->vdev;
391 err = virtio_cread_feature(vdev, VIRTIO_BLK_F_MQ,
392 struct virtio_blk_config, num_queues,
397 vblk->vqs = kmalloc(sizeof(*vblk->vqs) * num_vqs, GFP_KERNEL);
403 names = kmalloc(sizeof(*names) * num_vqs, GFP_KERNEL);
407 callbacks = kmalloc(sizeof(*callbacks) * num_vqs, GFP_KERNEL);
411 vqs = kmalloc(sizeof(*vqs) * num_vqs, GFP_KERNEL);
415 for (i = 0; i < num_vqs; i++) {
416 callbacks[i] = virtblk_done;
417 snprintf(vblk->vqs[i].name, VQ_NAME_LEN, "req.%d", i);
418 names[i] = vblk->vqs[i].name;
421 /* Discover virtqueues and write information to configuration. */
422 err = vdev->config->find_vqs(vdev, num_vqs, vqs, callbacks, names);
426 for (i = 0; i < num_vqs; i++) {
427 spin_lock_init(&vblk->vqs[i].lock);
428 vblk->vqs[i].vq = vqs[i];
430 vblk->num_vqs = num_vqs;
446 * Legacy naming scheme used for virtio devices. We are stuck with it for
447 * virtio blk but don't ever use it for any new driver.
449 static int virtblk_name_format(char *prefix, int index, char *buf, int buflen)
451 const int base = 'z' - 'a' + 1;
452 char *begin = buf + strlen(prefix);
453 char *end = buf + buflen;
463 *--p = 'a' + (index % unit);
464 index = (index / unit) - 1;
465 } while (index >= 0);
467 memmove(begin, p, end - p);
468 memcpy(buf, prefix, strlen(prefix));
473 static int virtblk_get_cache_mode(struct virtio_device *vdev)
478 err = virtio_cread_feature(vdev, VIRTIO_BLK_F_CONFIG_WCE,
479 struct virtio_blk_config, wce,
482 writeback = virtio_has_feature(vdev, VIRTIO_BLK_F_WCE) ||
483 virtio_has_feature(vdev, VIRTIO_F_VERSION_1);
488 static void virtblk_update_cache_mode(struct virtio_device *vdev)
490 u8 writeback = virtblk_get_cache_mode(vdev);
491 struct virtio_blk *vblk = vdev->priv;
494 blk_queue_flush(vblk->disk->queue, REQ_FLUSH);
496 blk_queue_flush(vblk->disk->queue, 0);
498 revalidate_disk(vblk->disk);
501 static const char *const virtblk_cache_types[] = {
502 "write through", "write back"
506 virtblk_cache_type_store(struct device *dev, struct device_attribute *attr,
507 const char *buf, size_t count)
509 struct gendisk *disk = dev_to_disk(dev);
510 struct virtio_blk *vblk = disk->private_data;
511 struct virtio_device *vdev = vblk->vdev;
514 BUG_ON(!virtio_has_feature(vblk->vdev, VIRTIO_BLK_F_CONFIG_WCE));
515 for (i = ARRAY_SIZE(virtblk_cache_types); --i >= 0; )
516 if (sysfs_streq(buf, virtblk_cache_types[i]))
522 virtio_cwrite8(vdev, offsetof(struct virtio_blk_config, wce), i);
523 virtblk_update_cache_mode(vdev);
528 virtblk_cache_type_show(struct device *dev, struct device_attribute *attr,
531 struct gendisk *disk = dev_to_disk(dev);
532 struct virtio_blk *vblk = disk->private_data;
533 u8 writeback = virtblk_get_cache_mode(vblk->vdev);
535 BUG_ON(writeback >= ARRAY_SIZE(virtblk_cache_types));
536 return snprintf(buf, 40, "%s\n", virtblk_cache_types[writeback]);
539 static const struct device_attribute dev_attr_cache_type_ro =
540 __ATTR(cache_type, S_IRUGO,
541 virtblk_cache_type_show, NULL);
542 static const struct device_attribute dev_attr_cache_type_rw =
543 __ATTR(cache_type, S_IRUGO|S_IWUSR,
544 virtblk_cache_type_show, virtblk_cache_type_store);
546 static int virtblk_init_request(void *data, struct request *rq,
547 unsigned int hctx_idx, unsigned int request_idx,
548 unsigned int numa_node)
550 struct virtio_blk *vblk = data;
551 struct virtblk_req *vbr = blk_mq_rq_to_pdu(rq);
553 sg_init_table(vbr->sg, vblk->sg_elems);
557 static struct blk_mq_ops virtio_mq_ops = {
558 .queue_rq = virtio_queue_rq,
559 .map_queue = blk_mq_map_queue,
560 .complete = virtblk_request_done,
561 .init_request = virtblk_init_request,
564 static unsigned int virtblk_queue_depth;
565 module_param_named(queue_depth, virtblk_queue_depth, uint, 0444);
567 static int virtblk_probe(struct virtio_device *vdev)
569 struct virtio_blk *vblk;
570 struct request_queue *q;
574 u32 v, blk_size, sg_elems, opt_io_size;
576 u8 physical_block_exp, alignment_offset;
578 err = ida_simple_get(&vd_index_ida, 0, minor_to_index(1 << MINORBITS),
584 /* We need to know how many segments before we allocate. */
585 err = virtio_cread_feature(vdev, VIRTIO_BLK_F_SEG_MAX,
586 struct virtio_blk_config, seg_max,
589 /* We need at least one SG element, whatever they say. */
590 if (err || !sg_elems)
593 /* We need an extra sg elements at head and tail. */
595 vdev->priv = vblk = kmalloc(sizeof(*vblk), GFP_KERNEL);
602 vblk->sg_elems = sg_elems;
604 INIT_WORK(&vblk->config_work, virtblk_config_changed_work);
610 /* FIXME: How many partitions? How long is a piece of string? */
611 vblk->disk = alloc_disk(1 << PART_BITS);
617 /* Default queue sizing is to fill the ring. */
618 if (!virtblk_queue_depth) {
619 virtblk_queue_depth = vblk->vqs[0].vq->num_free;
620 /* ... but without indirect descs, we use 2 descs per req */
621 if (!virtio_has_feature(vdev, VIRTIO_RING_F_INDIRECT_DESC))
622 virtblk_queue_depth /= 2;
625 memset(&vblk->tag_set, 0, sizeof(vblk->tag_set));
626 vblk->tag_set.ops = &virtio_mq_ops;
627 vblk->tag_set.queue_depth = virtblk_queue_depth;
628 vblk->tag_set.numa_node = NUMA_NO_NODE;
629 vblk->tag_set.flags = BLK_MQ_F_SHOULD_MERGE;
630 vblk->tag_set.cmd_size =
631 sizeof(struct virtblk_req) +
632 sizeof(struct scatterlist) * sg_elems;
633 vblk->tag_set.driver_data = vblk;
634 vblk->tag_set.nr_hw_queues = vblk->num_vqs;
636 err = blk_mq_alloc_tag_set(&vblk->tag_set);
640 q = vblk->disk->queue = blk_mq_init_queue(&vblk->tag_set);
648 virtblk_name_format("vd", index, vblk->disk->disk_name, DISK_NAME_LEN);
650 vblk->disk->major = major;
651 vblk->disk->first_minor = index_to_minor(index);
652 vblk->disk->private_data = vblk;
653 vblk->disk->fops = &virtblk_fops;
654 vblk->disk->driverfs_dev = &vdev->dev;
657 /* configure queue flush support */
658 virtblk_update_cache_mode(vdev);
660 /* If disk is read-only in the host, the guest should obey */
661 if (virtio_has_feature(vdev, VIRTIO_BLK_F_RO))
662 set_disk_ro(vblk->disk, 1);
664 /* Host must always specify the capacity. */
665 virtio_cread(vdev, struct virtio_blk_config, capacity, &cap);
667 /* If capacity is too big, truncate with warning. */
668 if ((sector_t)cap != cap) {
669 dev_warn(&vdev->dev, "Capacity %llu too large: truncating\n",
670 (unsigned long long)cap);
673 set_capacity(vblk->disk, cap);
675 /* We can handle whatever the host told us to handle. */
676 blk_queue_max_segments(q, vblk->sg_elems-2);
678 /* No need to bounce any requests */
679 blk_queue_bounce_limit(q, BLK_BOUNCE_ANY);
681 /* No real sector limit. */
682 blk_queue_max_hw_sectors(q, -1U);
684 /* Host can optionally specify maximum segment size and number of
686 err = virtio_cread_feature(vdev, VIRTIO_BLK_F_SIZE_MAX,
687 struct virtio_blk_config, size_max, &v);
689 blk_queue_max_segment_size(q, v);
691 blk_queue_max_segment_size(q, -1U);
693 /* Host can optionally specify the block size of the device */
694 err = virtio_cread_feature(vdev, VIRTIO_BLK_F_BLK_SIZE,
695 struct virtio_blk_config, blk_size,
698 blk_queue_logical_block_size(q, blk_size);
700 blk_size = queue_logical_block_size(q);
702 /* Use topology information if available */
703 err = virtio_cread_feature(vdev, VIRTIO_BLK_F_TOPOLOGY,
704 struct virtio_blk_config, physical_block_exp,
705 &physical_block_exp);
706 if (!err && physical_block_exp)
707 blk_queue_physical_block_size(q,
708 blk_size * (1 << physical_block_exp));
710 err = virtio_cread_feature(vdev, VIRTIO_BLK_F_TOPOLOGY,
711 struct virtio_blk_config, alignment_offset,
713 if (!err && alignment_offset)
714 blk_queue_alignment_offset(q, blk_size * alignment_offset);
716 err = virtio_cread_feature(vdev, VIRTIO_BLK_F_TOPOLOGY,
717 struct virtio_blk_config, min_io_size,
719 if (!err && min_io_size)
720 blk_queue_io_min(q, blk_size * min_io_size);
722 err = virtio_cread_feature(vdev, VIRTIO_BLK_F_TOPOLOGY,
723 struct virtio_blk_config, opt_io_size,
725 if (!err && opt_io_size)
726 blk_queue_io_opt(q, blk_size * opt_io_size);
728 virtio_device_ready(vdev);
730 add_disk(vblk->disk);
731 err = device_create_file(disk_to_dev(vblk->disk), &dev_attr_serial);
735 if (virtio_has_feature(vdev, VIRTIO_BLK_F_CONFIG_WCE))
736 err = device_create_file(disk_to_dev(vblk->disk),
737 &dev_attr_cache_type_rw);
739 err = device_create_file(disk_to_dev(vblk->disk),
740 &dev_attr_cache_type_ro);
746 del_gendisk(vblk->disk);
747 blk_cleanup_queue(vblk->disk->queue);
749 blk_mq_free_tag_set(&vblk->tag_set);
751 put_disk(vblk->disk);
753 vdev->config->del_vqs(vdev);
757 ida_simple_remove(&vd_index_ida, index);
762 static void virtblk_remove(struct virtio_device *vdev)
764 struct virtio_blk *vblk = vdev->priv;
765 int index = vblk->index;
768 /* Make sure no work handler is accessing the device. */
769 flush_work(&vblk->config_work);
771 del_gendisk(vblk->disk);
772 blk_cleanup_queue(vblk->disk->queue);
774 blk_mq_free_tag_set(&vblk->tag_set);
776 /* Stop all the virtqueues. */
777 vdev->config->reset(vdev);
779 refc = atomic_read(&disk_to_dev(vblk->disk)->kobj.kref.refcount);
780 put_disk(vblk->disk);
781 vdev->config->del_vqs(vdev);
785 /* Only free device id if we don't have any users */
787 ida_simple_remove(&vd_index_ida, index);
790 #ifdef CONFIG_PM_SLEEP
791 static int virtblk_freeze(struct virtio_device *vdev)
793 struct virtio_blk *vblk = vdev->priv;
795 /* Ensure we don't receive any more interrupts */
796 vdev->config->reset(vdev);
798 /* Make sure no work handler is accessing the device. */
799 flush_work(&vblk->config_work);
801 blk_mq_stop_hw_queues(vblk->disk->queue);
803 vdev->config->del_vqs(vdev);
807 static int virtblk_restore(struct virtio_device *vdev)
809 struct virtio_blk *vblk = vdev->priv;
812 ret = init_vq(vdev->priv);
816 virtio_device_ready(vdev);
818 blk_mq_start_stopped_hw_queues(vblk->disk->queue, true);
823 static const struct virtio_device_id id_table[] = {
824 { VIRTIO_ID_BLOCK, VIRTIO_DEV_ANY_ID },
828 static unsigned int features_legacy[] = {
829 VIRTIO_BLK_F_SEG_MAX, VIRTIO_BLK_F_SIZE_MAX, VIRTIO_BLK_F_GEOMETRY,
830 VIRTIO_BLK_F_RO, VIRTIO_BLK_F_BLK_SIZE, VIRTIO_BLK_F_SCSI,
831 VIRTIO_BLK_F_WCE, VIRTIO_BLK_F_TOPOLOGY, VIRTIO_BLK_F_CONFIG_WCE,
835 static unsigned int features[] = {
836 VIRTIO_BLK_F_SEG_MAX, VIRTIO_BLK_F_SIZE_MAX, VIRTIO_BLK_F_GEOMETRY,
837 VIRTIO_BLK_F_RO, VIRTIO_BLK_F_BLK_SIZE,
838 VIRTIO_BLK_F_TOPOLOGY,
842 static struct virtio_driver virtio_blk = {
843 .feature_table = features,
844 .feature_table_size = ARRAY_SIZE(features),
845 .feature_table_legacy = features_legacy,
846 .feature_table_size_legacy = ARRAY_SIZE(features_legacy),
847 .driver.name = KBUILD_MODNAME,
848 .driver.owner = THIS_MODULE,
849 .id_table = id_table,
850 .probe = virtblk_probe,
851 .remove = virtblk_remove,
852 .config_changed = virtblk_config_changed,
853 #ifdef CONFIG_PM_SLEEP
854 .freeze = virtblk_freeze,
855 .restore = virtblk_restore,
859 static int __init init(void)
863 virtblk_wq = alloc_workqueue("virtio-blk", 0, 0);
867 major = register_blkdev(0, "virtblk");
870 goto out_destroy_workqueue;
873 error = register_virtio_driver(&virtio_blk);
875 goto out_unregister_blkdev;
878 out_unregister_blkdev:
879 unregister_blkdev(major, "virtblk");
880 out_destroy_workqueue:
881 destroy_workqueue(virtblk_wq);
885 static void __exit fini(void)
887 unregister_virtio_driver(&virtio_blk);
888 unregister_blkdev(major, "virtblk");
889 destroy_workqueue(virtblk_wq);
894 MODULE_DEVICE_TABLE(virtio, id_table);
895 MODULE_DESCRIPTION("Virtio block driver");
896 MODULE_LICENSE("GPL");