Rusty Russell | e467cde | 2007-10-22 11:03:38 +1000 | [diff] [blame] | 1 | //#define DEBUG |
| 2 | #include <linux/spinlock.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 3 | #include <linux/slab.h> |
Rusty Russell | e467cde | 2007-10-22 11:03:38 +1000 | [diff] [blame] | 4 | #include <linux/blkdev.h> |
| 5 | #include <linux/hdreg.h> |
Paul Gortmaker | 0c8d44f | 2011-07-01 15:56:05 -0400 | [diff] [blame] | 6 | #include <linux/module.h> |
Michael S. Tsirkin | 4678d6f | 2012-01-12 15:44:44 +1030 | [diff] [blame] | 7 | #include <linux/mutex.h> |
Rusty Russell | e467cde | 2007-10-22 11:03:38 +1000 | [diff] [blame] | 8 | #include <linux/virtio.h> |
| 9 | #include <linux/virtio_blk.h> |
Jens Axboe | 3d1266c | 2007-10-24 13:21:21 +0200 | [diff] [blame] | 10 | #include <linux/scatterlist.h> |
Christoph Hellwig | 7a7c924 | 2011-02-01 21:43:48 +0100 | [diff] [blame] | 11 | #include <linux/string_helpers.h> |
Liu Yuan | 6917f83 | 2011-04-24 02:49:26 +0800 | [diff] [blame] | 12 | #include <scsi/scsi_cmnd.h> |
Michael S. Tsirkin | 5087a50 | 2011-10-30 21:29:59 +0200 | [diff] [blame] | 13 | #include <linux/idr.h> |
Jens Axboe | 1cf7e9c | 2013-11-01 10:52:52 -0600 | [diff] [blame] | 14 | #include <linux/blk-mq.h> |
| 15 | #include <linux/numa.h> |
Jens Axboe | 3d1266c | 2007-10-24 13:21:21 +0200 | [diff] [blame] | 16 | |
Christian Borntraeger | 4f3bf19 | 2008-01-31 15:53:53 +0100 | [diff] [blame] | 17 | #define PART_BITS 4 |
Ming Lei | 6a27b65 | 2014-06-26 17:41:48 +0800 | [diff] [blame] | 18 | #define VQ_NAME_LEN 16 |
Rusty Russell | e467cde | 2007-10-22 11:03:38 +1000 | [diff] [blame] | 19 | |
Michael S. Tsirkin | 5087a50 | 2011-10-30 21:29:59 +0200 | [diff] [blame] | 20 | static int major; |
| 21 | static DEFINE_IDA(vd_index_ida); |
| 22 | |
Jonghwan Choi | 2a647bf | 2013-05-20 10:25:39 +0930 | [diff] [blame] | 23 | static struct workqueue_struct *virtblk_wq; |
Christian Borntraeger | 4f3bf19 | 2008-01-31 15:53:53 +0100 | [diff] [blame] | 24 | |
Ming Lei | 6a27b65 | 2014-06-26 17:41:48 +0800 | [diff] [blame] | 25 | struct virtio_blk_vq { |
| 26 | struct virtqueue *vq; |
| 27 | spinlock_t lock; |
| 28 | char name[VQ_NAME_LEN]; |
| 29 | } ____cacheline_aligned_in_smp; |
| 30 | |
Michael S. Tsirkin | bb6ec57 | 2015-01-15 13:33:31 +0200 | [diff] [blame] | 31 | struct virtio_blk { |
Rusty Russell | e467cde | 2007-10-22 11:03:38 +1000 | [diff] [blame] | 32 | struct virtio_device *vdev; |
Rusty Russell | e467cde | 2007-10-22 11:03:38 +1000 | [diff] [blame] | 33 | |
| 34 | /* The disk structure for the kernel. */ |
| 35 | struct gendisk *disk; |
| 36 | |
Christoph Hellwig | 24d2f90 | 2014-04-15 14:14:00 -0600 | [diff] [blame] | 37 | /* Block layer tags. */ |
| 38 | struct blk_mq_tag_set tag_set; |
| 39 | |
Christoph Hellwig | 7a7c924 | 2011-02-01 21:43:48 +0100 | [diff] [blame] | 40 | /* Process context for config space updates */ |
| 41 | struct work_struct config_work; |
| 42 | |
Rusty Russell | 0864b79 | 2008-12-30 09:26:05 -0600 | [diff] [blame] | 43 | /* What host tells us, plus 2 for header & tailer. */ |
| 44 | unsigned int sg_elems; |
| 45 | |
Michael S. Tsirkin | 5087a50 | 2011-10-30 21:29:59 +0200 | [diff] [blame] | 46 | /* Ida index - used to track minor number allocations. */ |
| 47 | int index; |
Ming Lei | 6a27b65 | 2014-06-26 17:41:48 +0800 | [diff] [blame] | 48 | |
| 49 | /* num of vqs */ |
| 50 | int num_vqs; |
| 51 | struct virtio_blk_vq *vqs; |
Rusty Russell | e467cde | 2007-10-22 11:03:38 +1000 | [diff] [blame] | 52 | }; |
| 53 | |
Michael S. Tsirkin | bb6ec57 | 2015-01-15 13:33:31 +0200 | [diff] [blame] | 54 | struct virtblk_req { |
Rusty Russell | e467cde | 2007-10-22 11:03:38 +1000 | [diff] [blame] | 55 | struct request *req; |
| 56 | struct virtio_blk_outhdr out_hdr; |
Hannes Reinecke | 1cde26f | 2009-05-18 14:41:30 +0200 | [diff] [blame] | 57 | struct virtio_scsi_inhdr in_hdr; |
Rusty Russell | cb38fa2 | 2008-05-02 21:50:45 -0500 | [diff] [blame] | 58 | u8 status; |
Asias He | a98755c | 2012-08-08 16:07:04 +0800 | [diff] [blame] | 59 | struct scatterlist sg[]; |
Rusty Russell | e467cde | 2007-10-22 11:03:38 +1000 | [diff] [blame] | 60 | }; |
| 61 | |
Asias He | a98755c | 2012-08-08 16:07:04 +0800 | [diff] [blame] | 62 | static inline int virtblk_result(struct virtblk_req *vbr) |
| 63 | { |
| 64 | switch (vbr->status) { |
| 65 | case VIRTIO_BLK_S_OK: |
| 66 | return 0; |
| 67 | case VIRTIO_BLK_S_UNSUPP: |
| 68 | return -ENOTTY; |
| 69 | default: |
| 70 | return -EIO; |
| 71 | } |
| 72 | } |
| 73 | |
Paolo Bonzini | 8f39db9 | 2013-03-20 15:44:27 +1030 | [diff] [blame] | 74 | static int __virtblk_add_req(struct virtqueue *vq, |
Paolo Bonzini | 20af3cf | 2013-03-20 15:44:27 +1030 | [diff] [blame] | 75 | struct virtblk_req *vbr, |
| 76 | struct scatterlist *data_sg, |
Rusty Russell | 0a11cc3 | 2013-03-20 15:44:27 +1030 | [diff] [blame] | 77 | bool have_data) |
Asias He | c85a1f9 | 2012-08-08 16:07:05 +0800 | [diff] [blame] | 78 | { |
Paolo Bonzini | 20af3cf | 2013-03-20 15:44:27 +1030 | [diff] [blame] | 79 | struct scatterlist hdr, status, cmd, sense, inhdr, *sgs[6]; |
Paolo Bonzini | 8f39db9 | 2013-03-20 15:44:27 +1030 | [diff] [blame] | 80 | unsigned int num_out = 0, num_in = 0; |
Michael S. Tsirkin | 19c1c5a | 2014-10-07 16:39:49 +0200 | [diff] [blame] | 81 | __virtio32 type = vbr->out_hdr.type & ~cpu_to_virtio32(vq->vdev, VIRTIO_BLK_T_OUT); |
Paolo Bonzini | 8f39db9 | 2013-03-20 15:44:27 +1030 | [diff] [blame] | 82 | |
| 83 | sg_init_one(&hdr, &vbr->out_hdr, sizeof(vbr->out_hdr)); |
| 84 | sgs[num_out++] = &hdr; |
| 85 | |
Paolo Bonzini | 20af3cf | 2013-03-20 15:44:27 +1030 | [diff] [blame] | 86 | /* |
| 87 | * If this is a packet command we need a couple of additional headers. |
| 88 | * Behind the normal outhdr we put a segment with the scsi command |
| 89 | * block, and before the normal inhdr we put the sense data and the |
| 90 | * inhdr with additional status information. |
| 91 | */ |
Michael S. Tsirkin | 19c1c5a | 2014-10-07 16:39:49 +0200 | [diff] [blame] | 92 | if (type == cpu_to_virtio32(vq->vdev, VIRTIO_BLK_T_SCSI_CMD)) { |
Paolo Bonzini | 20af3cf | 2013-03-20 15:44:27 +1030 | [diff] [blame] | 93 | sg_init_one(&cmd, vbr->req->cmd, vbr->req->cmd_len); |
| 94 | sgs[num_out++] = &cmd; |
| 95 | } |
| 96 | |
Rusty Russell | 0a11cc3 | 2013-03-20 15:44:27 +1030 | [diff] [blame] | 97 | if (have_data) { |
Michael S. Tsirkin | 19c1c5a | 2014-10-07 16:39:49 +0200 | [diff] [blame] | 98 | if (vbr->out_hdr.type & cpu_to_virtio32(vq->vdev, VIRTIO_BLK_T_OUT)) |
Paolo Bonzini | 20af3cf | 2013-03-20 15:44:27 +1030 | [diff] [blame] | 99 | sgs[num_out++] = data_sg; |
Paolo Bonzini | 8f39db9 | 2013-03-20 15:44:27 +1030 | [diff] [blame] | 100 | else |
Paolo Bonzini | 20af3cf | 2013-03-20 15:44:27 +1030 | [diff] [blame] | 101 | sgs[num_out + num_in++] = data_sg; |
| 102 | } |
| 103 | |
Michael S. Tsirkin | 19c1c5a | 2014-10-07 16:39:49 +0200 | [diff] [blame] | 104 | if (type == cpu_to_virtio32(vq->vdev, VIRTIO_BLK_T_SCSI_CMD)) { |
Paolo Bonzini | 20af3cf | 2013-03-20 15:44:27 +1030 | [diff] [blame] | 105 | sg_init_one(&sense, vbr->req->sense, SCSI_SENSE_BUFFERSIZE); |
| 106 | sgs[num_out + num_in++] = &sense; |
| 107 | sg_init_one(&inhdr, &vbr->in_hdr, sizeof(vbr->in_hdr)); |
| 108 | sgs[num_out + num_in++] = &inhdr; |
Paolo Bonzini | 8f39db9 | 2013-03-20 15:44:27 +1030 | [diff] [blame] | 109 | } |
| 110 | |
| 111 | sg_init_one(&status, &vbr->status, sizeof(vbr->status)); |
| 112 | sgs[num_out + num_in++] = &status; |
| 113 | |
| 114 | return virtqueue_add_sgs(vq, sgs, num_out, num_in, vbr, GFP_ATOMIC); |
Paolo Bonzini | 5ee21a5 | 2013-03-20 15:44:27 +1030 | [diff] [blame] | 115 | } |
Asias He | c85a1f9 | 2012-08-08 16:07:05 +0800 | [diff] [blame] | 116 | |
Christoph Hellwig | 5124c28 | 2014-02-10 03:24:39 -0800 | [diff] [blame] | 117 | static inline void virtblk_request_done(struct request *req) |
Asias He | c85a1f9 | 2012-08-08 16:07:05 +0800 | [diff] [blame] | 118 | { |
Christoph Hellwig | 9d74e25 | 2014-04-14 10:30:07 +0200 | [diff] [blame] | 119 | struct virtblk_req *vbr = blk_mq_rq_to_pdu(req); |
Michael S. Tsirkin | 19c1c5a | 2014-10-07 16:39:49 +0200 | [diff] [blame] | 120 | struct virtio_blk *vblk = req->q->queuedata; |
Asias He | a98755c | 2012-08-08 16:07:04 +0800 | [diff] [blame] | 121 | int error = virtblk_result(vbr); |
| 122 | |
| 123 | if (req->cmd_type == REQ_TYPE_BLOCK_PC) { |
Michael S. Tsirkin | 19c1c5a | 2014-10-07 16:39:49 +0200 | [diff] [blame] | 124 | req->resid_len = virtio32_to_cpu(vblk->vdev, vbr->in_hdr.residual); |
| 125 | req->sense_len = virtio32_to_cpu(vblk->vdev, vbr->in_hdr.sense_len); |
| 126 | req->errors = virtio32_to_cpu(vblk->vdev, vbr->in_hdr.errors); |
Christoph Hellwig | 4f8c951 | 2015-04-17 22:37:16 +0200 | [diff] [blame] | 127 | } else if (req->cmd_type == REQ_TYPE_DRV_PRIV) { |
Asias He | a98755c | 2012-08-08 16:07:04 +0800 | [diff] [blame] | 128 | req->errors = (error != 0); |
| 129 | } |
| 130 | |
Christoph Hellwig | c8a446a | 2014-09-13 16:40:10 -0700 | [diff] [blame] | 131 | blk_mq_end_request(req, error); |
Asias He | a98755c | 2012-08-08 16:07:04 +0800 | [diff] [blame] | 132 | } |
| 133 | |
| 134 | static void virtblk_done(struct virtqueue *vq) |
Rusty Russell | e467cde | 2007-10-22 11:03:38 +1000 | [diff] [blame] | 135 | { |
| 136 | struct virtio_blk *vblk = vq->vdev->priv; |
Jens Axboe | 1cf7e9c | 2013-11-01 10:52:52 -0600 | [diff] [blame] | 137 | bool req_done = false; |
Ming Lei | 6a27b65 | 2014-06-26 17:41:48 +0800 | [diff] [blame] | 138 | int qid = vq->index; |
Rusty Russell | e467cde | 2007-10-22 11:03:38 +1000 | [diff] [blame] | 139 | struct virtblk_req *vbr; |
Rusty Russell | e467cde | 2007-10-22 11:03:38 +1000 | [diff] [blame] | 140 | unsigned long flags; |
Asias He | a98755c | 2012-08-08 16:07:04 +0800 | [diff] [blame] | 141 | unsigned int len; |
Rusty Russell | e467cde | 2007-10-22 11:03:38 +1000 | [diff] [blame] | 142 | |
Ming Lei | 6a27b65 | 2014-06-26 17:41:48 +0800 | [diff] [blame] | 143 | spin_lock_irqsave(&vblk->vqs[qid].lock, flags); |
Asias He | bb81110 | 2012-09-25 10:36:17 +0800 | [diff] [blame] | 144 | do { |
| 145 | virtqueue_disable_cb(vq); |
Ming Lei | 6a27b65 | 2014-06-26 17:41:48 +0800 | [diff] [blame] | 146 | while ((vbr = virtqueue_get_buf(vblk->vqs[qid].vq, &len)) != NULL) { |
Christoph Hellwig | f4829a9 | 2015-09-27 21:01:50 +0200 | [diff] [blame] | 147 | blk_mq_complete_request(vbr->req, vbr->req->errors); |
Jens Axboe | 1cf7e9c | 2013-11-01 10:52:52 -0600 | [diff] [blame] | 148 | req_done = true; |
Rusty Russell | e467cde | 2007-10-22 11:03:38 +1000 | [diff] [blame] | 149 | } |
Heinz Graalfs | 7f03b17 | 2013-10-29 09:40:30 +1030 | [diff] [blame] | 150 | if (unlikely(virtqueue_is_broken(vq))) |
| 151 | break; |
Asias He | bb81110 | 2012-09-25 10:36:17 +0800 | [diff] [blame] | 152 | } while (!virtqueue_enable_cb(vq)); |
Jens Axboe | 1cf7e9c | 2013-11-01 10:52:52 -0600 | [diff] [blame] | 153 | |
Rusty Russell | e467cde | 2007-10-22 11:03:38 +1000 | [diff] [blame] | 154 | /* In case queue is stopped waiting for more buffers. */ |
Asias He | a98755c | 2012-08-08 16:07:04 +0800 | [diff] [blame] | 155 | if (req_done) |
Christoph Hellwig | 1b4a325 | 2014-04-16 09:44:54 +0200 | [diff] [blame] | 156 | blk_mq_start_stopped_hw_queues(vblk->disk->queue, true); |
Ming Lei | 6a27b65 | 2014-06-26 17:41:48 +0800 | [diff] [blame] | 157 | spin_unlock_irqrestore(&vblk->vqs[qid].lock, flags); |
Asias He | a98755c | 2012-08-08 16:07:04 +0800 | [diff] [blame] | 158 | } |
| 159 | |
Jens Axboe | 74c4505 | 2014-10-29 11:14:52 -0600 | [diff] [blame] | 160 | static int virtio_queue_rq(struct blk_mq_hw_ctx *hctx, |
| 161 | const struct blk_mq_queue_data *bd) |
Rusty Russell | e467cde | 2007-10-22 11:03:38 +1000 | [diff] [blame] | 162 | { |
Jens Axboe | 1cf7e9c | 2013-11-01 10:52:52 -0600 | [diff] [blame] | 163 | struct virtio_blk *vblk = hctx->queue->queuedata; |
Jens Axboe | 74c4505 | 2014-10-29 11:14:52 -0600 | [diff] [blame] | 164 | struct request *req = bd->rq; |
Christoph Hellwig | 9d74e25 | 2014-04-14 10:30:07 +0200 | [diff] [blame] | 165 | struct virtblk_req *vbr = blk_mq_rq_to_pdu(req); |
Jens Axboe | 1cf7e9c | 2013-11-01 10:52:52 -0600 | [diff] [blame] | 166 | unsigned long flags; |
Paolo Bonzini | 20af3cf | 2013-03-20 15:44:27 +1030 | [diff] [blame] | 167 | unsigned int num; |
Ming Lei | 6a27b65 | 2014-06-26 17:41:48 +0800 | [diff] [blame] | 168 | int qid = hctx->queue_num; |
Rusty Russell | 5261b85 | 2014-03-13 11:23:39 +1030 | [diff] [blame] | 169 | int err; |
Ming Lei | e8edca6 | 2014-05-30 10:49:29 +0800 | [diff] [blame] | 170 | bool notify = false; |
Rusty Russell | e467cde | 2007-10-22 11:03:38 +1000 | [diff] [blame] | 171 | |
Jens Axboe | 1cf7e9c | 2013-11-01 10:52:52 -0600 | [diff] [blame] | 172 | BUG_ON(req->nr_phys_segments + 2 > vblk->sg_elems); |
Rusty Russell | e467cde | 2007-10-22 11:03:38 +1000 | [diff] [blame] | 173 | |
| 174 | vbr->req = req; |
Mike Christie | 3a5e02c | 2016-06-05 14:32:23 -0500 | [diff] [blame] | 175 | if (req_op(req) == REQ_OP_FLUSH) { |
Michael S. Tsirkin | 19c1c5a | 2014-10-07 16:39:49 +0200 | [diff] [blame] | 176 | vbr->out_hdr.type = cpu_to_virtio32(vblk->vdev, VIRTIO_BLK_T_FLUSH); |
Rusty Russell | e467cde | 2007-10-22 11:03:38 +1000 | [diff] [blame] | 177 | vbr->out_hdr.sector = 0; |
Michael S. Tsirkin | 19c1c5a | 2014-10-07 16:39:49 +0200 | [diff] [blame] | 178 | vbr->out_hdr.ioprio = cpu_to_virtio32(vblk->vdev, req_get_ioprio(vbr->req)); |
FUJITA Tomonori | dd40e45 | 2010-07-03 17:45:38 +0900 | [diff] [blame] | 179 | } else { |
| 180 | switch (req->cmd_type) { |
| 181 | case REQ_TYPE_FS: |
| 182 | vbr->out_hdr.type = 0; |
Michael S. Tsirkin | 19c1c5a | 2014-10-07 16:39:49 +0200 | [diff] [blame] | 183 | vbr->out_hdr.sector = cpu_to_virtio64(vblk->vdev, blk_rq_pos(vbr->req)); |
| 184 | vbr->out_hdr.ioprio = cpu_to_virtio32(vblk->vdev, req_get_ioprio(vbr->req)); |
FUJITA Tomonori | dd40e45 | 2010-07-03 17:45:38 +0900 | [diff] [blame] | 185 | break; |
| 186 | case REQ_TYPE_BLOCK_PC: |
Michael S. Tsirkin | 19c1c5a | 2014-10-07 16:39:49 +0200 | [diff] [blame] | 187 | vbr->out_hdr.type = cpu_to_virtio32(vblk->vdev, VIRTIO_BLK_T_SCSI_CMD); |
Christoph Hellwig | f1b0ef06 | 2009-09-17 19:57:42 +0200 | [diff] [blame] | 188 | vbr->out_hdr.sector = 0; |
Michael S. Tsirkin | 19c1c5a | 2014-10-07 16:39:49 +0200 | [diff] [blame] | 189 | vbr->out_hdr.ioprio = cpu_to_virtio32(vblk->vdev, req_get_ioprio(vbr->req)); |
Christoph Hellwig | f1b0ef06 | 2009-09-17 19:57:42 +0200 | [diff] [blame] | 190 | break; |
Christoph Hellwig | 4f8c951 | 2015-04-17 22:37:16 +0200 | [diff] [blame] | 191 | case REQ_TYPE_DRV_PRIV: |
Michael S. Tsirkin | 19c1c5a | 2014-10-07 16:39:49 +0200 | [diff] [blame] | 192 | vbr->out_hdr.type = cpu_to_virtio32(vblk->vdev, VIRTIO_BLK_T_GET_ID); |
FUJITA Tomonori | dd40e45 | 2010-07-03 17:45:38 +0900 | [diff] [blame] | 193 | vbr->out_hdr.sector = 0; |
Michael S. Tsirkin | 19c1c5a | 2014-10-07 16:39:49 +0200 | [diff] [blame] | 194 | vbr->out_hdr.ioprio = cpu_to_virtio32(vblk->vdev, req_get_ioprio(vbr->req)); |
FUJITA Tomonori | dd40e45 | 2010-07-03 17:45:38 +0900 | [diff] [blame] | 195 | break; |
| 196 | default: |
| 197 | /* We don't put anything else in the queue. */ |
| 198 | BUG(); |
Christoph Hellwig | f1b0ef06 | 2009-09-17 19:57:42 +0200 | [diff] [blame] | 199 | } |
Rusty Russell | e467cde | 2007-10-22 11:03:38 +1000 | [diff] [blame] | 200 | } |
| 201 | |
Christoph Hellwig | e249007 | 2014-09-13 16:40:09 -0700 | [diff] [blame] | 202 | blk_mq_start_request(req); |
| 203 | |
Jens Axboe | 1cf7e9c | 2013-11-01 10:52:52 -0600 | [diff] [blame] | 204 | num = blk_rq_map_sg(hctx->queue, vbr->req, vbr->sg); |
Hannes Reinecke | 1cde26f | 2009-05-18 14:41:30 +0200 | [diff] [blame] | 205 | if (num) { |
Paolo Bonzini | 20af3cf | 2013-03-20 15:44:27 +1030 | [diff] [blame] | 206 | if (rq_data_dir(vbr->req) == WRITE) |
Michael S. Tsirkin | 19c1c5a | 2014-10-07 16:39:49 +0200 | [diff] [blame] | 207 | vbr->out_hdr.type |= cpu_to_virtio32(vblk->vdev, VIRTIO_BLK_T_OUT); |
Paolo Bonzini | 20af3cf | 2013-03-20 15:44:27 +1030 | [diff] [blame] | 208 | else |
Michael S. Tsirkin | 19c1c5a | 2014-10-07 16:39:49 +0200 | [diff] [blame] | 209 | vbr->out_hdr.type |= cpu_to_virtio32(vblk->vdev, VIRTIO_BLK_T_IN); |
Rusty Russell | e467cde | 2007-10-22 11:03:38 +1000 | [diff] [blame] | 210 | } |
| 211 | |
Ming Lei | 6a27b65 | 2014-06-26 17:41:48 +0800 | [diff] [blame] | 212 | spin_lock_irqsave(&vblk->vqs[qid].lock, flags); |
| 213 | err = __virtblk_add_req(vblk->vqs[qid].vq, vbr, vbr->sg, num); |
Rusty Russell | 5261b85 | 2014-03-13 11:23:39 +1030 | [diff] [blame] | 214 | if (err) { |
Ming Lei | 6a27b65 | 2014-06-26 17:41:48 +0800 | [diff] [blame] | 215 | virtqueue_kick(vblk->vqs[qid].vq); |
Jens Axboe | 1cf7e9c | 2013-11-01 10:52:52 -0600 | [diff] [blame] | 216 | blk_mq_stop_hw_queue(hctx); |
Ming Lei | 6a27b65 | 2014-06-26 17:41:48 +0800 | [diff] [blame] | 217 | spin_unlock_irqrestore(&vblk->vqs[qid].lock, flags); |
Rusty Russell | 5261b85 | 2014-03-13 11:23:39 +1030 | [diff] [blame] | 218 | /* Out of mem doesn't actually happen, since we fall back |
| 219 | * to direct descriptors */ |
| 220 | if (err == -ENOMEM || err == -ENOSPC) |
| 221 | return BLK_MQ_RQ_QUEUE_BUSY; |
| 222 | return BLK_MQ_RQ_QUEUE_ERROR; |
Asias He | a98755c | 2012-08-08 16:07:04 +0800 | [diff] [blame] | 223 | } |
| 224 | |
Jens Axboe | 74c4505 | 2014-10-29 11:14:52 -0600 | [diff] [blame] | 225 | if (bd->last && virtqueue_kick_prepare(vblk->vqs[qid].vq)) |
Ming Lei | e8edca6 | 2014-05-30 10:49:29 +0800 | [diff] [blame] | 226 | notify = true; |
Ming Lei | 6a27b65 | 2014-06-26 17:41:48 +0800 | [diff] [blame] | 227 | spin_unlock_irqrestore(&vblk->vqs[qid].lock, flags); |
Ming Lei | e8edca6 | 2014-05-30 10:49:29 +0800 | [diff] [blame] | 228 | |
| 229 | if (notify) |
Ming Lei | 6a27b65 | 2014-06-26 17:41:48 +0800 | [diff] [blame] | 230 | virtqueue_notify(vblk->vqs[qid].vq); |
Jens Axboe | 1cf7e9c | 2013-11-01 10:52:52 -0600 | [diff] [blame] | 231 | return BLK_MQ_RQ_QUEUE_OK; |
Asias He | a98755c | 2012-08-08 16:07:04 +0800 | [diff] [blame] | 232 | } |
| 233 | |
john cooper | 4cb2ea2 | 2010-03-25 01:33:33 -0400 | [diff] [blame] | 234 | /* return id (s/n) string for *disk to *id_str |
| 235 | */ |
| 236 | static int virtblk_get_id(struct gendisk *disk, char *id_str) |
| 237 | { |
| 238 | struct virtio_blk *vblk = disk->private_data; |
Christoph Hellwig | f959669 | 2016-07-19 11:31:49 +0200 | [diff] [blame] | 239 | struct request_queue *q = vblk->disk->queue; |
john cooper | 4cb2ea2 | 2010-03-25 01:33:33 -0400 | [diff] [blame] | 240 | struct request *req; |
Mike Snitzer | e4c4776 | 2010-10-09 12:12:13 +1030 | [diff] [blame] | 241 | int err; |
john cooper | 4cb2ea2 | 2010-03-25 01:33:33 -0400 | [diff] [blame] | 242 | |
Christoph Hellwig | f959669 | 2016-07-19 11:31:49 +0200 | [diff] [blame] | 243 | req = blk_get_request(q, READ, GFP_KERNEL); |
| 244 | if (IS_ERR(req)) |
john cooper | 4cb2ea2 | 2010-03-25 01:33:33 -0400 | [diff] [blame] | 245 | return PTR_ERR(req); |
Christoph Hellwig | 4f8c951 | 2015-04-17 22:37:16 +0200 | [diff] [blame] | 246 | req->cmd_type = REQ_TYPE_DRV_PRIV; |
Mike Snitzer | e4c4776 | 2010-10-09 12:12:13 +1030 | [diff] [blame] | 247 | |
Christoph Hellwig | f959669 | 2016-07-19 11:31:49 +0200 | [diff] [blame] | 248 | err = blk_rq_map_kern(q, req, id_str, VIRTIO_BLK_ID_BYTES, GFP_KERNEL); |
| 249 | if (err) |
| 250 | goto out; |
| 251 | |
| 252 | err = blk_execute_rq(vblk->disk->queue, vblk->disk, req, false); |
| 253 | out: |
| 254 | blk_put_request(req); |
Mike Snitzer | e4c4776 | 2010-10-09 12:12:13 +1030 | [diff] [blame] | 255 | return err; |
john cooper | 4cb2ea2 | 2010-03-25 01:33:33 -0400 | [diff] [blame] | 256 | } |
| 257 | |
Christoph Hellwig | fe5a50a | 2010-09-15 01:27:23 +0200 | [diff] [blame] | 258 | static int virtblk_ioctl(struct block_device *bdev, fmode_t mode, |
| 259 | unsigned int cmd, unsigned long data) |
Rusty Russell | e467cde | 2007-10-22 11:03:38 +1000 | [diff] [blame] | 260 | { |
Hannes Reinecke | 1cde26f | 2009-05-18 14:41:30 +0200 | [diff] [blame] | 261 | struct gendisk *disk = bdev->bd_disk; |
| 262 | struct virtio_blk *vblk = disk->private_data; |
| 263 | |
| 264 | /* |
| 265 | * Only allow the generic SCSI ioctls if the host can support it. |
| 266 | */ |
| 267 | if (!virtio_has_feature(vblk->vdev, VIRTIO_BLK_F_SCSI)) |
Christoph Hellwig | d9ecdea | 2009-06-20 21:29:41 +0200 | [diff] [blame] | 268 | return -ENOTTY; |
Hannes Reinecke | 1cde26f | 2009-05-18 14:41:30 +0200 | [diff] [blame] | 269 | |
Paolo Bonzini | 577ebb3 | 2012-01-12 16:01:27 +0100 | [diff] [blame] | 270 | return scsi_cmd_blk_ioctl(bdev, mode, cmd, |
| 271 | (void __user *)data); |
Rusty Russell | e467cde | 2007-10-22 11:03:38 +1000 | [diff] [blame] | 272 | } |
| 273 | |
Christian Borntraeger | 135da0b | 2008-01-23 17:56:50 +0100 | [diff] [blame] | 274 | /* We provide getgeo only to please some old bootloader/partitioning tools */ |
| 275 | static int virtblk_getgeo(struct block_device *bd, struct hd_geometry *geo) |
| 276 | { |
Ryan Harper | 48e4043 | 2008-04-16 13:56:37 -0500 | [diff] [blame] | 277 | struct virtio_blk *vblk = bd->bd_disk->private_data; |
Ryan Harper | 48e4043 | 2008-04-16 13:56:37 -0500 | [diff] [blame] | 278 | |
| 279 | /* see if the host passed in geometry config */ |
Rusty Russell | 855e0c5 | 2013-10-14 18:11:51 +1030 | [diff] [blame] | 280 | if (virtio_has_feature(vblk->vdev, VIRTIO_BLK_F_GEOMETRY)) { |
| 281 | virtio_cread(vblk->vdev, struct virtio_blk_config, |
| 282 | geometry.cylinders, &geo->cylinders); |
| 283 | virtio_cread(vblk->vdev, struct virtio_blk_config, |
| 284 | geometry.heads, &geo->heads); |
| 285 | virtio_cread(vblk->vdev, struct virtio_blk_config, |
| 286 | geometry.sectors, &geo->sectors); |
Ryan Harper | 48e4043 | 2008-04-16 13:56:37 -0500 | [diff] [blame] | 287 | } else { |
| 288 | /* some standard values, similar to sd */ |
| 289 | geo->heads = 1 << 6; |
| 290 | geo->sectors = 1 << 5; |
| 291 | geo->cylinders = get_capacity(bd->bd_disk) >> 11; |
| 292 | } |
Christian Borntraeger | 135da0b | 2008-01-23 17:56:50 +0100 | [diff] [blame] | 293 | return 0; |
| 294 | } |
| 295 | |
Alexey Dobriyan | 83d5cde | 2009-09-21 17:01:13 -0700 | [diff] [blame] | 296 | static const struct block_device_operations virtblk_fops = { |
Arnd Bergmann | 8a6cfeb | 2010-07-08 10:18:46 +0200 | [diff] [blame] | 297 | .ioctl = virtblk_ioctl, |
Christian Borntraeger | 135da0b | 2008-01-23 17:56:50 +0100 | [diff] [blame] | 298 | .owner = THIS_MODULE, |
| 299 | .getgeo = virtblk_getgeo, |
Rusty Russell | e467cde | 2007-10-22 11:03:38 +1000 | [diff] [blame] | 300 | }; |
| 301 | |
Christian Borntraeger | d50ed90 | 2008-02-01 09:05:00 +0100 | [diff] [blame] | 302 | static int index_to_minor(int index) |
| 303 | { |
| 304 | return index << PART_BITS; |
| 305 | } |
| 306 | |
Michael S. Tsirkin | 5087a50 | 2011-10-30 21:29:59 +0200 | [diff] [blame] | 307 | static int minor_to_index(int minor) |
| 308 | { |
| 309 | return minor >> PART_BITS; |
| 310 | } |
| 311 | |
Ryan Harper | a5eb9e4 | 2010-06-23 22:19:57 -0500 | [diff] [blame] | 312 | static ssize_t virtblk_serial_show(struct device *dev, |
| 313 | struct device_attribute *attr, char *buf) |
| 314 | { |
| 315 | struct gendisk *disk = dev_to_disk(dev); |
| 316 | int err; |
| 317 | |
| 318 | /* sysfs gives us a PAGE_SIZE buffer */ |
| 319 | BUILD_BUG_ON(PAGE_SIZE < VIRTIO_BLK_ID_BYTES); |
| 320 | |
| 321 | buf[VIRTIO_BLK_ID_BYTES] = '\0'; |
| 322 | err = virtblk_get_id(disk, buf); |
| 323 | if (!err) |
| 324 | return strlen(buf); |
| 325 | |
| 326 | if (err == -EIO) /* Unsupported? Make it empty. */ |
| 327 | return 0; |
| 328 | |
| 329 | return err; |
| 330 | } |
Michael S. Tsirkin | 393c525 | 2014-10-23 16:08:44 +0300 | [diff] [blame] | 331 | |
| 332 | static DEVICE_ATTR(serial, S_IRUGO, virtblk_serial_show, NULL); |
Ryan Harper | a5eb9e4 | 2010-06-23 22:19:57 -0500 | [diff] [blame] | 333 | |
Christoph Hellwig | 7a7c924 | 2011-02-01 21:43:48 +0100 | [diff] [blame] | 334 | static void virtblk_config_changed_work(struct work_struct *work) |
| 335 | { |
| 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]; |
Milos Vyletel | 9d9598b | 2013-03-12 15:34:40 +1030 | [diff] [blame] | 341 | char *envp[] = { "RESIZE=1", NULL }; |
James Bottomley | b9f28d8 | 2015-03-05 18:47:01 -0800 | [diff] [blame] | 342 | u64 capacity; |
Christoph Hellwig | 7a7c924 | 2011-02-01 21:43:48 +0100 | [diff] [blame] | 343 | |
| 344 | /* Host must always specify the capacity. */ |
Rusty Russell | 855e0c5 | 2013-10-14 18:11:51 +1030 | [diff] [blame] | 345 | virtio_cread(vdev, struct virtio_blk_config, capacity, &capacity); |
Christoph Hellwig | 7a7c924 | 2011-02-01 21:43:48 +0100 | [diff] [blame] | 346 | |
| 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; |
| 352 | } |
| 353 | |
James Bottomley | b9f28d8 | 2015-03-05 18:47:01 -0800 | [diff] [blame] | 354 | string_get_size(capacity, queue_logical_block_size(q), |
| 355 | STRING_UNITS_2, cap_str_2, sizeof(cap_str_2)); |
| 356 | string_get_size(capacity, queue_logical_block_size(q), |
| 357 | STRING_UNITS_10, cap_str_10, sizeof(cap_str_10)); |
Christoph Hellwig | 7a7c924 | 2011-02-01 21:43:48 +0100 | [diff] [blame] | 358 | |
| 359 | dev_notice(&vdev->dev, |
| 360 | "new size: %llu %d-byte logical blocks (%s/%s)\n", |
| 361 | (unsigned long long)capacity, |
| 362 | queue_logical_block_size(q), |
| 363 | cap_str_10, cap_str_2); |
| 364 | |
| 365 | set_capacity(vblk->disk, capacity); |
Vivek Goyal | e9986f3 | 2012-03-29 10:09:44 +0200 | [diff] [blame] | 366 | revalidate_disk(vblk->disk); |
Milos Vyletel | 9d9598b | 2013-03-12 15:34:40 +1030 | [diff] [blame] | 367 | kobject_uevent_env(&disk_to_dev(vblk->disk)->kobj, KOBJ_CHANGE, envp); |
Christoph Hellwig | 7a7c924 | 2011-02-01 21:43:48 +0100 | [diff] [blame] | 368 | } |
| 369 | |
| 370 | static void virtblk_config_changed(struct virtio_device *vdev) |
| 371 | { |
| 372 | struct virtio_blk *vblk = vdev->priv; |
| 373 | |
| 374 | queue_work(virtblk_wq, &vblk->config_work); |
| 375 | } |
| 376 | |
Amit Shah | 6abd6e5 | 2011-12-22 16:58:29 +0530 | [diff] [blame] | 377 | static int init_vq(struct virtio_blk *vblk) |
| 378 | { |
| 379 | int err = 0; |
Ming Lei | 6a27b65 | 2014-06-26 17:41:48 +0800 | [diff] [blame] | 380 | int i; |
| 381 | vq_callback_t **callbacks; |
| 382 | const char **names; |
| 383 | struct virtqueue **vqs; |
| 384 | unsigned short num_vqs; |
| 385 | struct virtio_device *vdev = vblk->vdev; |
Amit Shah | 6abd6e5 | 2011-12-22 16:58:29 +0530 | [diff] [blame] | 386 | |
Ming Lei | 6a27b65 | 2014-06-26 17:41:48 +0800 | [diff] [blame] | 387 | err = virtio_cread_feature(vdev, VIRTIO_BLK_F_MQ, |
| 388 | struct virtio_blk_config, num_queues, |
| 389 | &num_vqs); |
| 390 | if (err) |
| 391 | num_vqs = 1; |
Amit Shah | 6abd6e5 | 2011-12-22 16:58:29 +0530 | [diff] [blame] | 392 | |
Ming Lei | 6a27b65 | 2014-06-26 17:41:48 +0800 | [diff] [blame] | 393 | vblk->vqs = kmalloc(sizeof(*vblk->vqs) * num_vqs, GFP_KERNEL); |
Minfei Huang | 347a529 | 2016-08-09 16:39:20 +0800 | [diff] [blame] | 394 | if (!vblk->vqs) |
| 395 | return -ENOMEM; |
| 396 | |
| 397 | names = kmalloc(sizeof(*names) * num_vqs, GFP_KERNEL); |
| 398 | callbacks = kmalloc(sizeof(*callbacks) * num_vqs, GFP_KERNEL); |
| 399 | vqs = kmalloc(sizeof(*vqs) * num_vqs, GFP_KERNEL); |
| 400 | if (!names || !callbacks || !vqs) { |
Ming Lei | 6a27b65 | 2014-06-26 17:41:48 +0800 | [diff] [blame] | 401 | err = -ENOMEM; |
| 402 | goto out; |
| 403 | } |
| 404 | |
Ming Lei | 6a27b65 | 2014-06-26 17:41:48 +0800 | [diff] [blame] | 405 | for (i = 0; i < num_vqs; i++) { |
| 406 | callbacks[i] = virtblk_done; |
| 407 | snprintf(vblk->vqs[i].name, VQ_NAME_LEN, "req.%d", i); |
| 408 | names[i] = vblk->vqs[i].name; |
| 409 | } |
| 410 | |
| 411 | /* Discover virtqueues and write information to configuration. */ |
| 412 | err = vdev->config->find_vqs(vdev, num_vqs, vqs, callbacks, names); |
| 413 | if (err) |
Minfei Huang | 347a529 | 2016-08-09 16:39:20 +0800 | [diff] [blame] | 414 | goto out; |
Ming Lei | 6a27b65 | 2014-06-26 17:41:48 +0800 | [diff] [blame] | 415 | |
| 416 | for (i = 0; i < num_vqs; i++) { |
| 417 | spin_lock_init(&vblk->vqs[i].lock); |
| 418 | vblk->vqs[i].vq = vqs[i]; |
| 419 | } |
| 420 | vblk->num_vqs = num_vqs; |
| 421 | |
Minfei Huang | 347a529 | 2016-08-09 16:39:20 +0800 | [diff] [blame] | 422 | out: |
Ming Lei | 6a27b65 | 2014-06-26 17:41:48 +0800 | [diff] [blame] | 423 | kfree(vqs); |
Ming Lei | 6a27b65 | 2014-06-26 17:41:48 +0800 | [diff] [blame] | 424 | kfree(callbacks); |
Ming Lei | 6a27b65 | 2014-06-26 17:41:48 +0800 | [diff] [blame] | 425 | kfree(names); |
Ming Lei | 6a27b65 | 2014-06-26 17:41:48 +0800 | [diff] [blame] | 426 | if (err) |
| 427 | kfree(vblk->vqs); |
Amit Shah | 6abd6e5 | 2011-12-22 16:58:29 +0530 | [diff] [blame] | 428 | return err; |
| 429 | } |
| 430 | |
Ren Mingxin | c0aa3e0 | 2012-04-10 15:28:05 +0800 | [diff] [blame] | 431 | /* |
| 432 | * Legacy naming scheme used for virtio devices. We are stuck with it for |
| 433 | * virtio blk but don't ever use it for any new driver. |
| 434 | */ |
| 435 | static int virtblk_name_format(char *prefix, int index, char *buf, int buflen) |
| 436 | { |
| 437 | const int base = 'z' - 'a' + 1; |
| 438 | char *begin = buf + strlen(prefix); |
| 439 | char *end = buf + buflen; |
| 440 | char *p; |
| 441 | int unit; |
| 442 | |
| 443 | p = end - 1; |
| 444 | *p = '\0'; |
| 445 | unit = base; |
| 446 | do { |
| 447 | if (p == begin) |
| 448 | return -EINVAL; |
| 449 | *--p = 'a' + (index % unit); |
| 450 | index = (index / unit) - 1; |
| 451 | } while (index >= 0); |
| 452 | |
| 453 | memmove(begin, p, end - p); |
| 454 | memcpy(buf, prefix, strlen(prefix)); |
| 455 | |
| 456 | return 0; |
| 457 | } |
| 458 | |
Paolo Bonzini | cd5d503 | 2012-07-03 15:19:37 +0200 | [diff] [blame] | 459 | static int virtblk_get_cache_mode(struct virtio_device *vdev) |
| 460 | { |
| 461 | u8 writeback; |
| 462 | int err; |
| 463 | |
Rusty Russell | 855e0c5 | 2013-10-14 18:11:51 +1030 | [diff] [blame] | 464 | err = virtio_cread_feature(vdev, VIRTIO_BLK_F_CONFIG_WCE, |
| 465 | struct virtio_blk_config, wce, |
| 466 | &writeback); |
Michael S. Tsirkin | 592002f | 2016-02-24 17:07:27 +0200 | [diff] [blame] | 467 | |
| 468 | /* |
| 469 | * If WCE is not configurable and flush is not available, |
| 470 | * assume no writeback cache is in use. |
| 471 | */ |
Paolo Bonzini | cd5d503 | 2012-07-03 15:19:37 +0200 | [diff] [blame] | 472 | if (err) |
Michael S. Tsirkin | 592002f | 2016-02-24 17:07:27 +0200 | [diff] [blame] | 473 | writeback = virtio_has_feature(vdev, VIRTIO_BLK_F_FLUSH); |
Paolo Bonzini | cd5d503 | 2012-07-03 15:19:37 +0200 | [diff] [blame] | 474 | |
| 475 | return writeback; |
| 476 | } |
| 477 | |
| 478 | static void virtblk_update_cache_mode(struct virtio_device *vdev) |
| 479 | { |
| 480 | u8 writeback = virtblk_get_cache_mode(vdev); |
| 481 | struct virtio_blk *vblk = vdev->priv; |
| 482 | |
Jens Axboe | ad9126a | 2016-03-30 10:12:58 -0600 | [diff] [blame] | 483 | blk_queue_write_cache(vblk->disk->queue, writeback, false); |
Paolo Bonzini | cd5d503 | 2012-07-03 15:19:37 +0200 | [diff] [blame] | 484 | revalidate_disk(vblk->disk); |
| 485 | } |
| 486 | |
| 487 | static const char *const virtblk_cache_types[] = { |
| 488 | "write through", "write back" |
| 489 | }; |
| 490 | |
| 491 | static ssize_t |
| 492 | virtblk_cache_type_store(struct device *dev, struct device_attribute *attr, |
| 493 | const char *buf, size_t count) |
| 494 | { |
| 495 | struct gendisk *disk = dev_to_disk(dev); |
| 496 | struct virtio_blk *vblk = disk->private_data; |
| 497 | struct virtio_device *vdev = vblk->vdev; |
| 498 | int i; |
Paolo Bonzini | cd5d503 | 2012-07-03 15:19:37 +0200 | [diff] [blame] | 499 | |
| 500 | BUG_ON(!virtio_has_feature(vblk->vdev, VIRTIO_BLK_F_CONFIG_WCE)); |
| 501 | for (i = ARRAY_SIZE(virtblk_cache_types); --i >= 0; ) |
| 502 | if (sysfs_streq(buf, virtblk_cache_types[i])) |
| 503 | break; |
| 504 | |
| 505 | if (i < 0) |
| 506 | return -EINVAL; |
| 507 | |
Rusty Russell | 855e0c5 | 2013-10-14 18:11:51 +1030 | [diff] [blame] | 508 | virtio_cwrite8(vdev, offsetof(struct virtio_blk_config, wce), i); |
Paolo Bonzini | cd5d503 | 2012-07-03 15:19:37 +0200 | [diff] [blame] | 509 | virtblk_update_cache_mode(vdev); |
| 510 | return count; |
| 511 | } |
| 512 | |
| 513 | static ssize_t |
| 514 | virtblk_cache_type_show(struct device *dev, struct device_attribute *attr, |
| 515 | char *buf) |
| 516 | { |
| 517 | struct gendisk *disk = dev_to_disk(dev); |
| 518 | struct virtio_blk *vblk = disk->private_data; |
| 519 | u8 writeback = virtblk_get_cache_mode(vblk->vdev); |
| 520 | |
| 521 | BUG_ON(writeback >= ARRAY_SIZE(virtblk_cache_types)); |
| 522 | return snprintf(buf, 40, "%s\n", virtblk_cache_types[writeback]); |
| 523 | } |
| 524 | |
| 525 | static const struct device_attribute dev_attr_cache_type_ro = |
| 526 | __ATTR(cache_type, S_IRUGO, |
| 527 | virtblk_cache_type_show, NULL); |
| 528 | static const struct device_attribute dev_attr_cache_type_rw = |
| 529 | __ATTR(cache_type, S_IRUGO|S_IWUSR, |
| 530 | virtblk_cache_type_show, virtblk_cache_type_store); |
| 531 | |
Christoph Hellwig | 24d2f90 | 2014-04-15 14:14:00 -0600 | [diff] [blame] | 532 | static int virtblk_init_request(void *data, struct request *rq, |
| 533 | unsigned int hctx_idx, unsigned int request_idx, |
| 534 | unsigned int numa_node) |
Christoph Hellwig | e9b267d | 2014-04-15 13:59:10 -0600 | [diff] [blame] | 535 | { |
| 536 | struct virtio_blk *vblk = data; |
| 537 | struct virtblk_req *vbr = blk_mq_rq_to_pdu(rq); |
| 538 | |
| 539 | sg_init_table(vbr->sg, vblk->sg_elems); |
| 540 | return 0; |
| 541 | } |
| 542 | |
Jens Axboe | 1cf7e9c | 2013-11-01 10:52:52 -0600 | [diff] [blame] | 543 | static struct blk_mq_ops virtio_mq_ops = { |
| 544 | .queue_rq = virtio_queue_rq, |
| 545 | .map_queue = blk_mq_map_queue, |
Christoph Hellwig | 5124c28 | 2014-02-10 03:24:39 -0800 | [diff] [blame] | 546 | .complete = virtblk_request_done, |
Christoph Hellwig | 24d2f90 | 2014-04-15 14:14:00 -0600 | [diff] [blame] | 547 | .init_request = virtblk_init_request, |
Jens Axboe | 1cf7e9c | 2013-11-01 10:52:52 -0600 | [diff] [blame] | 548 | }; |
| 549 | |
Christoph Hellwig | 24d2f90 | 2014-04-15 14:14:00 -0600 | [diff] [blame] | 550 | static unsigned int virtblk_queue_depth; |
| 551 | module_param_named(queue_depth, virtblk_queue_depth, uint, 0444); |
Jens Axboe | 1cf7e9c | 2013-11-01 10:52:52 -0600 | [diff] [blame] | 552 | |
Greg Kroah-Hartman | 8d85fce | 2012-12-21 15:13:49 -0800 | [diff] [blame] | 553 | static int virtblk_probe(struct virtio_device *vdev) |
Rusty Russell | e467cde | 2007-10-22 11:03:38 +1000 | [diff] [blame] | 554 | { |
| 555 | struct virtio_blk *vblk; |
Christoph Hellwig | 69740c8 | 2010-02-24 14:22:25 -0600 | [diff] [blame] | 556 | struct request_queue *q; |
Michael S. Tsirkin | 5087a50 | 2011-10-30 21:29:59 +0200 | [diff] [blame] | 557 | int err, index; |
Asias He | a98755c | 2012-08-08 16:07:04 +0800 | [diff] [blame] | 558 | |
Rusty Russell | e467cde | 2007-10-22 11:03:38 +1000 | [diff] [blame] | 559 | u64 cap; |
Christoph Hellwig | 69740c8 | 2010-02-24 14:22:25 -0600 | [diff] [blame] | 560 | u32 v, blk_size, sg_elems, opt_io_size; |
| 561 | u16 min_io_size; |
| 562 | u8 physical_block_exp, alignment_offset; |
Rusty Russell | e467cde | 2007-10-22 11:03:38 +1000 | [diff] [blame] | 563 | |
Michael S. Tsirkin | a4379fd | 2015-01-12 16:23:37 +0200 | [diff] [blame] | 564 | if (!vdev->config->get) { |
| 565 | dev_err(&vdev->dev, "%s failure: config access disabled\n", |
| 566 | __func__); |
| 567 | return -EINVAL; |
| 568 | } |
| 569 | |
Michael S. Tsirkin | 5087a50 | 2011-10-30 21:29:59 +0200 | [diff] [blame] | 570 | err = ida_simple_get(&vd_index_ida, 0, minor_to_index(1 << MINORBITS), |
| 571 | GFP_KERNEL); |
| 572 | if (err < 0) |
| 573 | goto out; |
| 574 | index = err; |
Christian Borntraeger | 4f3bf19 | 2008-01-31 15:53:53 +0100 | [diff] [blame] | 575 | |
Rusty Russell | 0864b79 | 2008-12-30 09:26:05 -0600 | [diff] [blame] | 576 | /* We need to know how many segments before we allocate. */ |
Rusty Russell | 855e0c5 | 2013-10-14 18:11:51 +1030 | [diff] [blame] | 577 | err = virtio_cread_feature(vdev, VIRTIO_BLK_F_SEG_MAX, |
| 578 | struct virtio_blk_config, seg_max, |
| 579 | &sg_elems); |
Christoph Hellwig | a5b365a | 2010-05-25 14:17:54 +0200 | [diff] [blame] | 580 | |
| 581 | /* We need at least one SG element, whatever they say. */ |
| 582 | if (err || !sg_elems) |
Rusty Russell | 0864b79 | 2008-12-30 09:26:05 -0600 | [diff] [blame] | 583 | sg_elems = 1; |
| 584 | |
| 585 | /* We need an extra sg elements at head and tail. */ |
| 586 | sg_elems += 2; |
Jens Axboe | 1cf7e9c | 2013-11-01 10:52:52 -0600 | [diff] [blame] | 587 | vdev->priv = vblk = kmalloc(sizeof(*vblk), GFP_KERNEL); |
Rusty Russell | e467cde | 2007-10-22 11:03:38 +1000 | [diff] [blame] | 588 | if (!vblk) { |
| 589 | err = -ENOMEM; |
Michael S. Tsirkin | 5087a50 | 2011-10-30 21:29:59 +0200 | [diff] [blame] | 590 | goto out_free_index; |
Rusty Russell | e467cde | 2007-10-22 11:03:38 +1000 | [diff] [blame] | 591 | } |
| 592 | |
Rusty Russell | e467cde | 2007-10-22 11:03:38 +1000 | [diff] [blame] | 593 | vblk->vdev = vdev; |
Rusty Russell | 0864b79 | 2008-12-30 09:26:05 -0600 | [diff] [blame] | 594 | vblk->sg_elems = sg_elems; |
Asias He | a98755c | 2012-08-08 16:07:04 +0800 | [diff] [blame] | 595 | |
Christoph Hellwig | 7a7c924 | 2011-02-01 21:43:48 +0100 | [diff] [blame] | 596 | INIT_WORK(&vblk->config_work, virtblk_config_changed_work); |
Rusty Russell | e467cde | 2007-10-22 11:03:38 +1000 | [diff] [blame] | 597 | |
Amit Shah | 6abd6e5 | 2011-12-22 16:58:29 +0530 | [diff] [blame] | 598 | err = init_vq(vblk); |
| 599 | if (err) |
Rusty Russell | e467cde | 2007-10-22 11:03:38 +1000 | [diff] [blame] | 600 | goto out_free_vblk; |
Rusty Russell | e467cde | 2007-10-22 11:03:38 +1000 | [diff] [blame] | 601 | |
Rusty Russell | e467cde | 2007-10-22 11:03:38 +1000 | [diff] [blame] | 602 | /* FIXME: How many partitions? How long is a piece of string? */ |
Christian Borntraeger | 4f3bf19 | 2008-01-31 15:53:53 +0100 | [diff] [blame] | 603 | vblk->disk = alloc_disk(1 << PART_BITS); |
Rusty Russell | e467cde | 2007-10-22 11:03:38 +1000 | [diff] [blame] | 604 | if (!vblk->disk) { |
| 605 | err = -ENOMEM; |
Jens Axboe | 1cf7e9c | 2013-11-01 10:52:52 -0600 | [diff] [blame] | 606 | goto out_free_vq; |
Rusty Russell | e467cde | 2007-10-22 11:03:38 +1000 | [diff] [blame] | 607 | } |
| 608 | |
Rusty Russell | fc4324b | 2014-03-19 17:08:24 +1030 | [diff] [blame] | 609 | /* Default queue sizing is to fill the ring. */ |
Christoph Hellwig | 24d2f90 | 2014-04-15 14:14:00 -0600 | [diff] [blame] | 610 | if (!virtblk_queue_depth) { |
Ming Lei | 6a27b65 | 2014-06-26 17:41:48 +0800 | [diff] [blame] | 611 | virtblk_queue_depth = vblk->vqs[0].vq->num_free; |
Rusty Russell | fc4324b | 2014-03-19 17:08:24 +1030 | [diff] [blame] | 612 | /* ... but without indirect descs, we use 2 descs per req */ |
| 613 | if (!virtio_has_feature(vdev, VIRTIO_RING_F_INDIRECT_DESC)) |
Christoph Hellwig | 24d2f90 | 2014-04-15 14:14:00 -0600 | [diff] [blame] | 614 | virtblk_queue_depth /= 2; |
Rusty Russell | fc4324b | 2014-03-19 17:08:24 +1030 | [diff] [blame] | 615 | } |
Christoph Hellwig | 24d2f90 | 2014-04-15 14:14:00 -0600 | [diff] [blame] | 616 | |
| 617 | memset(&vblk->tag_set, 0, sizeof(vblk->tag_set)); |
| 618 | vblk->tag_set.ops = &virtio_mq_ops; |
Christoph Hellwig | 24d2f90 | 2014-04-15 14:14:00 -0600 | [diff] [blame] | 619 | vblk->tag_set.queue_depth = virtblk_queue_depth; |
| 620 | vblk->tag_set.numa_node = NUMA_NO_NODE; |
| 621 | vblk->tag_set.flags = BLK_MQ_F_SHOULD_MERGE; |
| 622 | vblk->tag_set.cmd_size = |
Jens Axboe | 1cf7e9c | 2013-11-01 10:52:52 -0600 | [diff] [blame] | 623 | sizeof(struct virtblk_req) + |
| 624 | sizeof(struct scatterlist) * sg_elems; |
Christoph Hellwig | 24d2f90 | 2014-04-15 14:14:00 -0600 | [diff] [blame] | 625 | vblk->tag_set.driver_data = vblk; |
Ming Lei | 6a27b65 | 2014-06-26 17:41:48 +0800 | [diff] [blame] | 626 | vblk->tag_set.nr_hw_queues = vblk->num_vqs; |
Jens Axboe | 1cf7e9c | 2013-11-01 10:52:52 -0600 | [diff] [blame] | 627 | |
Christoph Hellwig | 24d2f90 | 2014-04-15 14:14:00 -0600 | [diff] [blame] | 628 | err = blk_mq_alloc_tag_set(&vblk->tag_set); |
| 629 | if (err) |
| 630 | goto out_put_disk; |
| 631 | |
| 632 | q = vblk->disk->queue = blk_mq_init_queue(&vblk->tag_set); |
Ming Lei | 35b489d | 2015-01-02 14:25:27 +0000 | [diff] [blame] | 633 | if (IS_ERR(q)) { |
Rusty Russell | e467cde | 2007-10-22 11:03:38 +1000 | [diff] [blame] | 634 | err = -ENOMEM; |
Christoph Hellwig | 24d2f90 | 2014-04-15 14:14:00 -0600 | [diff] [blame] | 635 | goto out_free_tags; |
Rusty Russell | e467cde | 2007-10-22 11:03:38 +1000 | [diff] [blame] | 636 | } |
| 637 | |
Christoph Hellwig | 69740c8 | 2010-02-24 14:22:25 -0600 | [diff] [blame] | 638 | q->queuedata = vblk; |
Fernando Luis Vázquez Cao | 7d116b6 | 2008-10-27 18:45:15 +0900 | [diff] [blame] | 639 | |
Ren Mingxin | c0aa3e0 | 2012-04-10 15:28:05 +0800 | [diff] [blame] | 640 | virtblk_name_format("vd", index, vblk->disk->disk_name, DISK_NAME_LEN); |
Christian Borntraeger | d50ed90 | 2008-02-01 09:05:00 +0100 | [diff] [blame] | 641 | |
Rusty Russell | e467cde | 2007-10-22 11:03:38 +1000 | [diff] [blame] | 642 | vblk->disk->major = major; |
Christian Borntraeger | d50ed90 | 2008-02-01 09:05:00 +0100 | [diff] [blame] | 643 | vblk->disk->first_minor = index_to_minor(index); |
Rusty Russell | e467cde | 2007-10-22 11:03:38 +1000 | [diff] [blame] | 644 | vblk->disk->private_data = vblk; |
| 645 | vblk->disk->fops = &virtblk_fops; |
Fam Zheng | 5fa3142 | 2015-09-06 17:05:42 +0800 | [diff] [blame] | 646 | vblk->disk->flags |= GENHD_FL_EXT_DEVT; |
Michael S. Tsirkin | 5087a50 | 2011-10-30 21:29:59 +0200 | [diff] [blame] | 647 | vblk->index = index; |
Christian Borntraeger | 4f3bf19 | 2008-01-31 15:53:53 +0100 | [diff] [blame] | 648 | |
Tejun Heo | 02c42b7 | 2010-09-03 11:56:18 +0200 | [diff] [blame] | 649 | /* configure queue flush support */ |
Paolo Bonzini | cd5d503 | 2012-07-03 15:19:37 +0200 | [diff] [blame] | 650 | virtblk_update_cache_mode(vdev); |
Rusty Russell | e467cde | 2007-10-22 11:03:38 +1000 | [diff] [blame] | 651 | |
Christian Borntraeger | 3ef5360 | 2008-05-16 11:17:03 +0200 | [diff] [blame] | 652 | /* If disk is read-only in the host, the guest should obey */ |
| 653 | if (virtio_has_feature(vdev, VIRTIO_BLK_F_RO)) |
| 654 | set_disk_ro(vblk->disk, 1); |
| 655 | |
Rusty Russell | a586d4f | 2008-02-04 23:49:56 -0500 | [diff] [blame] | 656 | /* Host must always specify the capacity. */ |
Rusty Russell | 855e0c5 | 2013-10-14 18:11:51 +1030 | [diff] [blame] | 657 | virtio_cread(vdev, struct virtio_blk_config, capacity, &cap); |
Rusty Russell | e467cde | 2007-10-22 11:03:38 +1000 | [diff] [blame] | 658 | |
| 659 | /* If capacity is too big, truncate with warning. */ |
| 660 | if ((sector_t)cap != cap) { |
| 661 | dev_warn(&vdev->dev, "Capacity %llu too large: truncating\n", |
| 662 | (unsigned long long)cap); |
| 663 | cap = (sector_t)-1; |
| 664 | } |
| 665 | set_capacity(vblk->disk, cap); |
| 666 | |
Rusty Russell | 0864b79 | 2008-12-30 09:26:05 -0600 | [diff] [blame] | 667 | /* We can handle whatever the host told us to handle. */ |
Martin K. Petersen | ee714f2 | 2010-03-10 00:48:32 -0500 | [diff] [blame] | 668 | blk_queue_max_segments(q, vblk->sg_elems-2); |
Rusty Russell | 0864b79 | 2008-12-30 09:26:05 -0600 | [diff] [blame] | 669 | |
Christoph Hellwig | 4eff3ca | 2009-07-17 21:47:45 -0600 | [diff] [blame] | 670 | /* No need to bounce any requests */ |
Christoph Hellwig | 69740c8 | 2010-02-24 14:22:25 -0600 | [diff] [blame] | 671 | blk_queue_bounce_limit(q, BLK_BOUNCE_ANY); |
Christoph Hellwig | 4eff3ca | 2009-07-17 21:47:45 -0600 | [diff] [blame] | 672 | |
Rusty Russell | 4b7f7e2 | 2008-12-30 09:26:04 -0600 | [diff] [blame] | 673 | /* No real sector limit. */ |
Martin K. Petersen | ee714f2 | 2010-03-10 00:48:32 -0500 | [diff] [blame] | 674 | blk_queue_max_hw_sectors(q, -1U); |
Rusty Russell | 4b7f7e2 | 2008-12-30 09:26:04 -0600 | [diff] [blame] | 675 | |
Rusty Russell | a586d4f | 2008-02-04 23:49:56 -0500 | [diff] [blame] | 676 | /* Host can optionally specify maximum segment size and number of |
| 677 | * segments. */ |
Rusty Russell | 855e0c5 | 2013-10-14 18:11:51 +1030 | [diff] [blame] | 678 | err = virtio_cread_feature(vdev, VIRTIO_BLK_F_SIZE_MAX, |
| 679 | struct virtio_blk_config, size_max, &v); |
Rusty Russell | e467cde | 2007-10-22 11:03:38 +1000 | [diff] [blame] | 680 | if (!err) |
Christoph Hellwig | 69740c8 | 2010-02-24 14:22:25 -0600 | [diff] [blame] | 681 | blk_queue_max_segment_size(q, v); |
Rusty Russell | 4b7f7e2 | 2008-12-30 09:26:04 -0600 | [diff] [blame] | 682 | else |
Christoph Hellwig | 69740c8 | 2010-02-24 14:22:25 -0600 | [diff] [blame] | 683 | blk_queue_max_segment_size(q, -1U); |
Rusty Russell | e467cde | 2007-10-22 11:03:38 +1000 | [diff] [blame] | 684 | |
Christian Borntraeger | 066f4d8 | 2008-05-29 11:08:26 +0200 | [diff] [blame] | 685 | /* Host can optionally specify the block size of the device */ |
Rusty Russell | 855e0c5 | 2013-10-14 18:11:51 +1030 | [diff] [blame] | 686 | err = virtio_cread_feature(vdev, VIRTIO_BLK_F_BLK_SIZE, |
| 687 | struct virtio_blk_config, blk_size, |
| 688 | &blk_size); |
Christian Borntraeger | 066f4d8 | 2008-05-29 11:08:26 +0200 | [diff] [blame] | 689 | if (!err) |
Christoph Hellwig | 69740c8 | 2010-02-24 14:22:25 -0600 | [diff] [blame] | 690 | blk_queue_logical_block_size(q, blk_size); |
| 691 | else |
| 692 | blk_size = queue_logical_block_size(q); |
| 693 | |
| 694 | /* Use topology information if available */ |
Rusty Russell | 855e0c5 | 2013-10-14 18:11:51 +1030 | [diff] [blame] | 695 | err = virtio_cread_feature(vdev, VIRTIO_BLK_F_TOPOLOGY, |
| 696 | struct virtio_blk_config, physical_block_exp, |
| 697 | &physical_block_exp); |
Christoph Hellwig | 69740c8 | 2010-02-24 14:22:25 -0600 | [diff] [blame] | 698 | if (!err && physical_block_exp) |
| 699 | blk_queue_physical_block_size(q, |
| 700 | blk_size * (1 << physical_block_exp)); |
| 701 | |
Rusty Russell | 855e0c5 | 2013-10-14 18:11:51 +1030 | [diff] [blame] | 702 | err = virtio_cread_feature(vdev, VIRTIO_BLK_F_TOPOLOGY, |
| 703 | struct virtio_blk_config, alignment_offset, |
| 704 | &alignment_offset); |
Christoph Hellwig | 69740c8 | 2010-02-24 14:22:25 -0600 | [diff] [blame] | 705 | if (!err && alignment_offset) |
| 706 | blk_queue_alignment_offset(q, blk_size * alignment_offset); |
| 707 | |
Rusty Russell | 855e0c5 | 2013-10-14 18:11:51 +1030 | [diff] [blame] | 708 | err = virtio_cread_feature(vdev, VIRTIO_BLK_F_TOPOLOGY, |
| 709 | struct virtio_blk_config, min_io_size, |
| 710 | &min_io_size); |
Christoph Hellwig | 69740c8 | 2010-02-24 14:22:25 -0600 | [diff] [blame] | 711 | if (!err && min_io_size) |
| 712 | blk_queue_io_min(q, blk_size * min_io_size); |
| 713 | |
Rusty Russell | 855e0c5 | 2013-10-14 18:11:51 +1030 | [diff] [blame] | 714 | err = virtio_cread_feature(vdev, VIRTIO_BLK_F_TOPOLOGY, |
| 715 | struct virtio_blk_config, opt_io_size, |
| 716 | &opt_io_size); |
Christoph Hellwig | 69740c8 | 2010-02-24 14:22:25 -0600 | [diff] [blame] | 717 | if (!err && opt_io_size) |
| 718 | blk_queue_io_opt(q, blk_size * opt_io_size); |
| 719 | |
Michael S. Tsirkin | 7a11370 | 2014-10-15 10:22:30 +1030 | [diff] [blame] | 720 | virtio_device_ready(vdev); |
| 721 | |
Dan Williams | 0d52c756 | 2016-06-15 19:44:20 -0700 | [diff] [blame] | 722 | device_add_disk(&vdev->dev, vblk->disk); |
Ryan Harper | a5eb9e4 | 2010-06-23 22:19:57 -0500 | [diff] [blame] | 723 | err = device_create_file(disk_to_dev(vblk->disk), &dev_attr_serial); |
| 724 | if (err) |
| 725 | goto out_del_disk; |
| 726 | |
Paolo Bonzini | cd5d503 | 2012-07-03 15:19:37 +0200 | [diff] [blame] | 727 | if (virtio_has_feature(vdev, VIRTIO_BLK_F_CONFIG_WCE)) |
| 728 | err = device_create_file(disk_to_dev(vblk->disk), |
| 729 | &dev_attr_cache_type_rw); |
| 730 | else |
| 731 | err = device_create_file(disk_to_dev(vblk->disk), |
| 732 | &dev_attr_cache_type_ro); |
| 733 | if (err) |
| 734 | goto out_del_disk; |
Rusty Russell | e467cde | 2007-10-22 11:03:38 +1000 | [diff] [blame] | 735 | return 0; |
| 736 | |
Ryan Harper | a5eb9e4 | 2010-06-23 22:19:57 -0500 | [diff] [blame] | 737 | out_del_disk: |
| 738 | del_gendisk(vblk->disk); |
| 739 | blk_cleanup_queue(vblk->disk->queue); |
Christoph Hellwig | 24d2f90 | 2014-04-15 14:14:00 -0600 | [diff] [blame] | 740 | out_free_tags: |
| 741 | blk_mq_free_tag_set(&vblk->tag_set); |
Rusty Russell | e467cde | 2007-10-22 11:03:38 +1000 | [diff] [blame] | 742 | out_put_disk: |
| 743 | put_disk(vblk->disk); |
Rusty Russell | e467cde | 2007-10-22 11:03:38 +1000 | [diff] [blame] | 744 | out_free_vq: |
Michael S. Tsirkin | d2a7ddd | 2009-06-12 22:16:36 -0600 | [diff] [blame] | 745 | vdev->config->del_vqs(vdev); |
Rusty Russell | e467cde | 2007-10-22 11:03:38 +1000 | [diff] [blame] | 746 | out_free_vblk: |
| 747 | kfree(vblk); |
Michael S. Tsirkin | 5087a50 | 2011-10-30 21:29:59 +0200 | [diff] [blame] | 748 | out_free_index: |
| 749 | ida_simple_remove(&vd_index_ida, index); |
Rusty Russell | e467cde | 2007-10-22 11:03:38 +1000 | [diff] [blame] | 750 | out: |
| 751 | return err; |
| 752 | } |
| 753 | |
Greg Kroah-Hartman | 8d85fce | 2012-12-21 15:13:49 -0800 | [diff] [blame] | 754 | static void virtblk_remove(struct virtio_device *vdev) |
Rusty Russell | e467cde | 2007-10-22 11:03:38 +1000 | [diff] [blame] | 755 | { |
| 756 | struct virtio_blk *vblk = vdev->priv; |
Michael S. Tsirkin | 5087a50 | 2011-10-30 21:29:59 +0200 | [diff] [blame] | 757 | int index = vblk->index; |
Alexander Graf | f4953fe | 2013-01-02 15:37:17 +1030 | [diff] [blame] | 758 | int refc; |
Rusty Russell | e467cde | 2007-10-22 11:03:38 +1000 | [diff] [blame] | 759 | |
Michael S. Tsirkin | cc74f71 | 2014-10-15 10:22:26 +1030 | [diff] [blame] | 760 | /* Make sure no work handler is accessing the device. */ |
| 761 | flush_work(&vblk->config_work); |
Christoph Hellwig | 7a7c924 | 2011-02-01 21:43:48 +0100 | [diff] [blame] | 762 | |
Asias He | 02e2b12 | 2012-05-25 10:34:47 +0800 | [diff] [blame] | 763 | del_gendisk(vblk->disk); |
Asias He | 483001c | 2012-05-25 10:34:48 +0800 | [diff] [blame] | 764 | blk_cleanup_queue(vblk->disk->queue); |
Asias He | 02e2b12 | 2012-05-25 10:34:47 +0800 | [diff] [blame] | 765 | |
Christoph Hellwig | 24d2f90 | 2014-04-15 14:14:00 -0600 | [diff] [blame] | 766 | blk_mq_free_tag_set(&vblk->tag_set); |
| 767 | |
Rusty Russell | 6e5aa7e | 2008-02-04 23:50:03 -0500 | [diff] [blame] | 768 | /* Stop all the virtqueues. */ |
| 769 | vdev->config->reset(vdev); |
| 770 | |
Alexander Graf | f4953fe | 2013-01-02 15:37:17 +1030 | [diff] [blame] | 771 | refc = atomic_read(&disk_to_dev(vblk->disk)->kobj.kref.refcount); |
Rusty Russell | e467cde | 2007-10-22 11:03:38 +1000 | [diff] [blame] | 772 | put_disk(vblk->disk); |
Michael S. Tsirkin | d2a7ddd | 2009-06-12 22:16:36 -0600 | [diff] [blame] | 773 | vdev->config->del_vqs(vdev); |
Ming Lei | 6a27b65 | 2014-06-26 17:41:48 +0800 | [diff] [blame] | 774 | kfree(vblk->vqs); |
Rusty Russell | e467cde | 2007-10-22 11:03:38 +1000 | [diff] [blame] | 775 | kfree(vblk); |
Alexander Graf | f4953fe | 2013-01-02 15:37:17 +1030 | [diff] [blame] | 776 | |
| 777 | /* Only free device id if we don't have any users */ |
| 778 | if (refc == 1) |
| 779 | ida_simple_remove(&vd_index_ida, index); |
Rusty Russell | e467cde | 2007-10-22 11:03:38 +1000 | [diff] [blame] | 780 | } |
| 781 | |
Aaron Lu | 8910700 | 2013-09-17 09:25:23 +0930 | [diff] [blame] | 782 | #ifdef CONFIG_PM_SLEEP |
Amit Shah | f8fb5bc | 2011-12-22 16:58:30 +0530 | [diff] [blame] | 783 | static int virtblk_freeze(struct virtio_device *vdev) |
| 784 | { |
| 785 | struct virtio_blk *vblk = vdev->priv; |
| 786 | |
| 787 | /* Ensure we don't receive any more interrupts */ |
| 788 | vdev->config->reset(vdev); |
| 789 | |
Michael S. Tsirkin | cc74f71 | 2014-10-15 10:22:26 +1030 | [diff] [blame] | 790 | /* Make sure no work handler is accessing the device. */ |
Amit Shah | f8fb5bc | 2011-12-22 16:58:30 +0530 | [diff] [blame] | 791 | flush_work(&vblk->config_work); |
| 792 | |
Jens Axboe | 1cf7e9c | 2013-11-01 10:52:52 -0600 | [diff] [blame] | 793 | blk_mq_stop_hw_queues(vblk->disk->queue); |
Amit Shah | f8fb5bc | 2011-12-22 16:58:30 +0530 | [diff] [blame] | 794 | |
| 795 | vdev->config->del_vqs(vdev); |
| 796 | return 0; |
| 797 | } |
| 798 | |
| 799 | static int virtblk_restore(struct virtio_device *vdev) |
| 800 | { |
| 801 | struct virtio_blk *vblk = vdev->priv; |
| 802 | int ret; |
| 803 | |
Amit Shah | f8fb5bc | 2011-12-22 16:58:30 +0530 | [diff] [blame] | 804 | ret = init_vq(vdev->priv); |
Michael S. Tsirkin | 6d62c37 | 2014-10-15 10:22:32 +1030 | [diff] [blame] | 805 | if (ret) |
| 806 | return ret; |
Jens Axboe | 1cf7e9c | 2013-11-01 10:52:52 -0600 | [diff] [blame] | 807 | |
Michael S. Tsirkin | 6d62c37 | 2014-10-15 10:22:32 +1030 | [diff] [blame] | 808 | virtio_device_ready(vdev); |
| 809 | |
| 810 | blk_mq_start_stopped_hw_queues(vblk->disk->queue, true); |
| 811 | return 0; |
Amit Shah | f8fb5bc | 2011-12-22 16:58:30 +0530 | [diff] [blame] | 812 | } |
| 813 | #endif |
| 814 | |
Márton Németh | 47483e2 | 2010-01-10 13:40:02 +0100 | [diff] [blame] | 815 | static const struct virtio_device_id id_table[] = { |
Rusty Russell | e467cde | 2007-10-22 11:03:38 +1000 | [diff] [blame] | 816 | { VIRTIO_ID_BLOCK, VIRTIO_DEV_ANY_ID }, |
| 817 | { 0 }, |
| 818 | }; |
| 819 | |
Michael S. Tsirkin | 19c1c5a | 2014-10-07 16:39:49 +0200 | [diff] [blame] | 820 | static unsigned int features_legacy[] = { |
Tejun Heo | 02c42b7 | 2010-09-03 11:56:18 +0200 | [diff] [blame] | 821 | VIRTIO_BLK_F_SEG_MAX, VIRTIO_BLK_F_SIZE_MAX, VIRTIO_BLK_F_GEOMETRY, |
| 822 | VIRTIO_BLK_F_RO, VIRTIO_BLK_F_BLK_SIZE, VIRTIO_BLK_F_SCSI, |
Michael S. Tsirkin | 592002f | 2016-02-24 17:07:27 +0200 | [diff] [blame] | 823 | VIRTIO_BLK_F_FLUSH, VIRTIO_BLK_F_TOPOLOGY, VIRTIO_BLK_F_CONFIG_WCE, |
Ming Lei | 6a27b65 | 2014-06-26 17:41:48 +0800 | [diff] [blame] | 824 | VIRTIO_BLK_F_MQ, |
Michael S. Tsirkin | 19c1c5a | 2014-10-07 16:39:49 +0200 | [diff] [blame] | 825 | } |
| 826 | ; |
| 827 | static unsigned int features[] = { |
| 828 | VIRTIO_BLK_F_SEG_MAX, VIRTIO_BLK_F_SIZE_MAX, VIRTIO_BLK_F_GEOMETRY, |
| 829 | VIRTIO_BLK_F_RO, VIRTIO_BLK_F_BLK_SIZE, |
Michael S. Tsirkin | 592002f | 2016-02-24 17:07:27 +0200 | [diff] [blame] | 830 | VIRTIO_BLK_F_FLUSH, VIRTIO_BLK_F_TOPOLOGY, VIRTIO_BLK_F_CONFIG_WCE, |
Michael S. Tsirkin | 19c1c5a | 2014-10-07 16:39:49 +0200 | [diff] [blame] | 831 | VIRTIO_BLK_F_MQ, |
Rusty Russell | c45a681 | 2008-05-02 21:50:50 -0500 | [diff] [blame] | 832 | }; |
| 833 | |
Greg Kroah-Hartman | 8d85fce | 2012-12-21 15:13:49 -0800 | [diff] [blame] | 834 | static struct virtio_driver virtio_blk = { |
Michael S. Tsirkin | 19c1c5a | 2014-10-07 16:39:49 +0200 | [diff] [blame] | 835 | .feature_table = features, |
| 836 | .feature_table_size = ARRAY_SIZE(features), |
| 837 | .feature_table_legacy = features_legacy, |
| 838 | .feature_table_size_legacy = ARRAY_SIZE(features_legacy), |
| 839 | .driver.name = KBUILD_MODNAME, |
| 840 | .driver.owner = THIS_MODULE, |
| 841 | .id_table = id_table, |
| 842 | .probe = virtblk_probe, |
| 843 | .remove = virtblk_remove, |
| 844 | .config_changed = virtblk_config_changed, |
Aaron Lu | 8910700 | 2013-09-17 09:25:23 +0930 | [diff] [blame] | 845 | #ifdef CONFIG_PM_SLEEP |
Michael S. Tsirkin | 19c1c5a | 2014-10-07 16:39:49 +0200 | [diff] [blame] | 846 | .freeze = virtblk_freeze, |
| 847 | .restore = virtblk_restore, |
Amit Shah | f8fb5bc | 2011-12-22 16:58:30 +0530 | [diff] [blame] | 848 | #endif |
Rusty Russell | e467cde | 2007-10-22 11:03:38 +1000 | [diff] [blame] | 849 | }; |
| 850 | |
| 851 | static int __init init(void) |
| 852 | { |
Christoph Hellwig | 7a7c924 | 2011-02-01 21:43:48 +0100 | [diff] [blame] | 853 | int error; |
| 854 | |
| 855 | virtblk_wq = alloc_workqueue("virtio-blk", 0, 0); |
| 856 | if (!virtblk_wq) |
| 857 | return -ENOMEM; |
| 858 | |
Christian Borntraeger | 4f3bf19 | 2008-01-31 15:53:53 +0100 | [diff] [blame] | 859 | major = register_blkdev(0, "virtblk"); |
Christoph Hellwig | 7a7c924 | 2011-02-01 21:43:48 +0100 | [diff] [blame] | 860 | if (major < 0) { |
| 861 | error = major; |
| 862 | goto out_destroy_workqueue; |
| 863 | } |
| 864 | |
| 865 | error = register_virtio_driver(&virtio_blk); |
| 866 | if (error) |
| 867 | goto out_unregister_blkdev; |
| 868 | return 0; |
| 869 | |
| 870 | out_unregister_blkdev: |
| 871 | unregister_blkdev(major, "virtblk"); |
| 872 | out_destroy_workqueue: |
| 873 | destroy_workqueue(virtblk_wq); |
| 874 | return error; |
Rusty Russell | e467cde | 2007-10-22 11:03:38 +1000 | [diff] [blame] | 875 | } |
| 876 | |
| 877 | static void __exit fini(void) |
| 878 | { |
Rusty Russell | e467cde | 2007-10-22 11:03:38 +1000 | [diff] [blame] | 879 | unregister_virtio_driver(&virtio_blk); |
Michael S. Tsirkin | 38f37b5 | 2014-10-23 18:57:19 +0300 | [diff] [blame] | 880 | unregister_blkdev(major, "virtblk"); |
Christoph Hellwig | 7a7c924 | 2011-02-01 21:43:48 +0100 | [diff] [blame] | 881 | destroy_workqueue(virtblk_wq); |
Rusty Russell | e467cde | 2007-10-22 11:03:38 +1000 | [diff] [blame] | 882 | } |
| 883 | module_init(init); |
| 884 | module_exit(fini); |
| 885 | |
| 886 | MODULE_DEVICE_TABLE(virtio, id_table); |
| 887 | MODULE_DESCRIPTION("Virtio block driver"); |
| 888 | MODULE_LICENSE("GPL"); |