2007-10-22 09:03:38 +08:00
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//#define DEBUG
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#include <linux/spinlock.h>
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#include <linux/blkdev.h>
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#include <linux/hdreg.h>
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#include <linux/virtio.h>
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#include <linux/virtio_blk.h>
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2007-10-24 19:21:21 +08:00
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#include <linux/scatterlist.h>
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2008-01-31 22:53:53 +08:00
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#define PART_BITS 4
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2007-10-22 09:03:38 +08:00
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2008-02-01 16:05:00 +08:00
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static int major, index;
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2008-01-31 22:53:53 +08:00
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2007-10-22 09:03:38 +08:00
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struct virtio_blk
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{
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spinlock_t lock;
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struct virtio_device *vdev;
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struct virtqueue *vq;
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/* The disk structure for the kernel. */
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struct gendisk *disk;
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/* Request tracking. */
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struct list_head reqs;
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mempool_t *pool;
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2008-12-30 23:26:05 +08:00
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/* What host tells us, plus 2 for header & tailer. */
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unsigned int sg_elems;
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2007-10-22 09:03:38 +08:00
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/* Scatterlist: can be too big for stack. */
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2008-12-30 23:26:05 +08:00
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struct scatterlist sg[/*sg_elems*/];
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2007-10-22 09:03:38 +08:00
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};
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struct virtblk_req
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{
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struct list_head list;
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struct request *req;
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struct virtio_blk_outhdr out_hdr;
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2009-05-18 20:41:30 +08:00
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struct virtio_scsi_inhdr in_hdr;
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2008-05-03 10:50:45 +08:00
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u8 status;
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2007-10-22 09:03:38 +08:00
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};
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2008-02-05 12:49:57 +08:00
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static void blk_done(struct virtqueue *vq)
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2007-10-22 09:03:38 +08:00
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{
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struct virtio_blk *vblk = vq->vdev->priv;
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struct virtblk_req *vbr;
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unsigned int len;
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unsigned long flags;
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spin_lock_irqsave(&vblk->lock, flags);
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while ((vbr = vblk->vq->vq_ops->get_buf(vblk->vq, &len)) != NULL) {
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2008-10-01 22:11:20 +08:00
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int error;
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2009-05-18 20:41:30 +08:00
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2008-05-03 10:50:45 +08:00
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switch (vbr->status) {
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2007-10-22 09:03:38 +08:00
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case VIRTIO_BLK_S_OK:
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2008-10-01 22:11:20 +08:00
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error = 0;
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2007-10-22 09:03:38 +08:00
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break;
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case VIRTIO_BLK_S_UNSUPP:
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2008-10-01 22:11:20 +08:00
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error = -ENOTTY;
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2007-10-22 09:03:38 +08:00
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break;
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default:
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2008-10-01 22:11:20 +08:00
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error = -EIO;
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2007-10-22 09:03:38 +08:00
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break;
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}
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2009-05-18 20:41:30 +08:00
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if (blk_pc_request(vbr->req)) {
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vbr->req->resid_len = vbr->in_hdr.residual;
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vbr->req->sense_len = vbr->in_hdr.sense_len;
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vbr->req->errors = vbr->in_hdr.errors;
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}
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2009-04-23 10:05:19 +08:00
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__blk_end_request_all(vbr->req, error);
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2007-10-22 09:03:38 +08:00
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list_del(&vbr->list);
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mempool_free(vbr, vblk->pool);
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}
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/* In case queue is stopped waiting for more buffers. */
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blk_start_queue(vblk->disk->queue);
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spin_unlock_irqrestore(&vblk->lock, flags);
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}
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static bool do_req(struct request_queue *q, struct virtio_blk *vblk,
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struct request *req)
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{
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2009-05-18 20:41:30 +08:00
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unsigned long num, out = 0, in = 0;
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2007-10-22 09:03:38 +08:00
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struct virtblk_req *vbr;
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vbr = mempool_alloc(vblk->pool, GFP_ATOMIC);
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if (!vbr)
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/* When another request finishes we'll try again. */
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return false;
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vbr->req = req;
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if (blk_fs_request(vbr->req)) {
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vbr->out_hdr.type = 0;
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2009-05-07 21:24:39 +08:00
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vbr->out_hdr.sector = blk_rq_pos(vbr->req);
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2008-08-14 15:59:13 +08:00
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vbr->out_hdr.ioprio = req_get_ioprio(vbr->req);
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2007-10-22 09:03:38 +08:00
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} else if (blk_pc_request(vbr->req)) {
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vbr->out_hdr.type = VIRTIO_BLK_T_SCSI_CMD;
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vbr->out_hdr.sector = 0;
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2008-08-14 15:59:13 +08:00
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vbr->out_hdr.ioprio = req_get_ioprio(vbr->req);
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2007-10-22 09:03:38 +08:00
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} else {
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/* We don't put anything else in the queue. */
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BUG();
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}
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if (blk_barrier_rq(vbr->req))
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vbr->out_hdr.type |= VIRTIO_BLK_T_BARRIER;
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2009-05-18 20:41:30 +08:00
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sg_set_buf(&vblk->sg[out++], &vbr->out_hdr, sizeof(vbr->out_hdr));
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2007-10-22 09:03:38 +08:00
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2009-05-18 20:41:30 +08:00
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/*
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* If this is a packet command we need a couple of additional headers.
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* Behind the normal outhdr we put a segment with the scsi command
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* block, and before the normal inhdr we put the sense data and the
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* inhdr with additional status information before the normal inhdr.
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*/
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if (blk_pc_request(vbr->req))
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sg_set_buf(&vblk->sg[out++], vbr->req->cmd, vbr->req->cmd_len);
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num = blk_rq_map_sg(q, vbr->req, vblk->sg + out);
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if (blk_pc_request(vbr->req)) {
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sg_set_buf(&vblk->sg[num + out + in++], vbr->req->sense, 96);
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sg_set_buf(&vblk->sg[num + out + in++], &vbr->in_hdr,
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sizeof(vbr->in_hdr));
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}
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sg_set_buf(&vblk->sg[num + out + in++], &vbr->status,
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sizeof(vbr->status));
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if (num) {
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if (rq_data_dir(vbr->req) == WRITE) {
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vbr->out_hdr.type |= VIRTIO_BLK_T_OUT;
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out += num;
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} else {
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vbr->out_hdr.type |= VIRTIO_BLK_T_IN;
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in += num;
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}
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2007-10-22 09:03:38 +08:00
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}
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if (vblk->vq->vq_ops->add_buf(vblk->vq, vblk->sg, out, in, vbr)) {
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mempool_free(vbr, vblk->pool);
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return false;
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}
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list_add_tail(&vbr->list, &vblk->reqs);
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return true;
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}
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static void do_virtblk_request(struct request_queue *q)
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{
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2009-05-18 20:38:28 +08:00
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struct virtio_blk *vblk = q->queuedata;
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2007-10-22 09:03:38 +08:00
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struct request *req;
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unsigned int issued = 0;
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2009-05-08 10:54:16 +08:00
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while ((req = blk_peek_request(q)) != NULL) {
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2008-12-30 23:26:05 +08:00
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BUG_ON(req->nr_phys_segments + 2 > vblk->sg_elems);
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2007-10-22 09:03:38 +08:00
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/* If this request fails, stop queue and wait for something to
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finish to restart it. */
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if (!do_req(q, vblk, req)) {
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blk_stop_queue(q);
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break;
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}
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2009-05-08 10:54:16 +08:00
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blk_start_request(req);
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2007-10-22 09:03:38 +08:00
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issued++;
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}
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if (issued)
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vblk->vq->vq_ops->kick(vblk->vq);
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}
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2009-06-09 20:41:40 +08:00
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/* return ATA identify data
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*/
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static int virtblk_identify(struct gendisk *disk, void *argp)
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{
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struct virtio_blk *vblk = disk->private_data;
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void *opaque;
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int err = -ENOMEM;
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opaque = kmalloc(VIRTIO_BLK_ID_BYTES, GFP_KERNEL);
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if (!opaque)
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goto out;
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err = virtio_config_buf(vblk->vdev, VIRTIO_BLK_F_IDENTIFY,
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offsetof(struct virtio_blk_config, identify), opaque,
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VIRTIO_BLK_ID_BYTES);
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if (err)
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goto out_kfree;
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if (copy_to_user(argp, opaque, VIRTIO_BLK_ID_BYTES))
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err = -EFAULT;
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out_kfree:
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kfree(opaque);
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out:
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return err;
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}
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2008-03-02 23:22:33 +08:00
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static int virtblk_ioctl(struct block_device *bdev, fmode_t mode,
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2007-10-22 09:03:38 +08:00
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unsigned cmd, unsigned long data)
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{
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2009-05-18 20:41:30 +08:00
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struct gendisk *disk = bdev->bd_disk;
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struct virtio_blk *vblk = disk->private_data;
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2009-06-09 20:41:40 +08:00
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void __user *argp = (void __user *)data;
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if (cmd == HDIO_GET_IDENTITY)
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return virtblk_identify(disk, argp);
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2009-05-18 20:41:30 +08:00
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/*
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* Only allow the generic SCSI ioctls if the host can support it.
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*/
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if (!virtio_has_feature(vblk->vdev, VIRTIO_BLK_F_SCSI))
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2009-06-21 03:29:41 +08:00
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return -ENOTTY;
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2009-05-18 20:41:30 +08:00
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2009-06-09 20:41:40 +08:00
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return scsi_cmd_ioctl(disk->queue, disk, mode, cmd, argp);
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2007-10-22 09:03:38 +08:00
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}
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2008-01-24 00:56:50 +08:00
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/* We provide getgeo only to please some old bootloader/partitioning tools */
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static int virtblk_getgeo(struct block_device *bd, struct hd_geometry *geo)
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{
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2008-04-17 02:56:37 +08:00
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struct virtio_blk *vblk = bd->bd_disk->private_data;
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struct virtio_blk_geometry vgeo;
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int err;
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/* see if the host passed in geometry config */
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err = virtio_config_val(vblk->vdev, VIRTIO_BLK_F_GEOMETRY,
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offsetof(struct virtio_blk_config, geometry),
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&vgeo);
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if (!err) {
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geo->heads = vgeo.heads;
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geo->sectors = vgeo.sectors;
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geo->cylinders = vgeo.cylinders;
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} else {
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/* some standard values, similar to sd */
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geo->heads = 1 << 6;
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geo->sectors = 1 << 5;
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geo->cylinders = get_capacity(bd->bd_disk) >> 11;
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}
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2008-01-24 00:56:50 +08:00
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return 0;
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}
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2007-10-22 09:03:38 +08:00
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static struct block_device_operations virtblk_fops = {
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2008-03-02 23:22:33 +08:00
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.locked_ioctl = virtblk_ioctl,
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2008-01-24 00:56:50 +08:00
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.owner = THIS_MODULE,
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.getgeo = virtblk_getgeo,
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2007-10-22 09:03:38 +08:00
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};
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2008-02-01 16:05:00 +08:00
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static int index_to_minor(int index)
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{
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return index << PART_BITS;
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}
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2009-05-18 15:39:09 +08:00
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static int __devinit virtblk_probe(struct virtio_device *vdev)
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2007-10-22 09:03:38 +08:00
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{
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struct virtio_blk *vblk;
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2008-01-31 22:53:53 +08:00
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int err;
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2007-10-22 09:03:38 +08:00
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u64 cap;
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u32 v;
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2008-12-30 23:26:05 +08:00
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u32 blk_size, sg_elems;
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2007-10-22 09:03:38 +08:00
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2008-02-01 16:05:00 +08:00
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if (index_to_minor(index) >= 1 << MINORBITS)
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2008-01-31 22:53:53 +08:00
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return -ENOSPC;
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2008-12-30 23:26:05 +08:00
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/* We need to know how many segments before we allocate. */
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err = virtio_config_val(vdev, VIRTIO_BLK_F_SEG_MAX,
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offsetof(struct virtio_blk_config, seg_max),
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&sg_elems);
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if (err)
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sg_elems = 1;
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/* We need an extra sg elements at head and tail. */
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sg_elems += 2;
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vdev->priv = vblk = kmalloc(sizeof(*vblk) +
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sizeof(vblk->sg[0]) * sg_elems, GFP_KERNEL);
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2007-10-22 09:03:38 +08:00
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if (!vblk) {
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err = -ENOMEM;
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goto out;
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}
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INIT_LIST_HEAD(&vblk->reqs);
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spin_lock_init(&vblk->lock);
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vblk->vdev = vdev;
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2008-12-30 23:26:05 +08:00
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vblk->sg_elems = sg_elems;
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sg_init_table(vblk->sg, vblk->sg_elems);
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2007-10-22 09:03:38 +08:00
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/* We expect one virtqueue, for output. */
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2009-06-13 12:16:36 +08:00
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vblk->vq = virtio_find_single_vq(vdev, blk_done, "requests");
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2007-10-22 09:03:38 +08:00
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if (IS_ERR(vblk->vq)) {
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err = PTR_ERR(vblk->vq);
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goto out_free_vblk;
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}
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vblk->pool = mempool_create_kmalloc_pool(1,sizeof(struct virtblk_req));
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if (!vblk->pool) {
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err = -ENOMEM;
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goto out_free_vq;
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}
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/* FIXME: How many partitions? How long is a piece of string? */
|
2008-01-31 22:53:53 +08:00
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vblk->disk = alloc_disk(1 << PART_BITS);
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2007-10-22 09:03:38 +08:00
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if (!vblk->disk) {
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err = -ENOMEM;
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2008-01-31 22:53:53 +08:00
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goto out_mempool;
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2007-10-22 09:03:38 +08:00
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}
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vblk->disk->queue = blk_init_queue(do_virtblk_request, &vblk->lock);
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if (!vblk->disk->queue) {
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err = -ENOMEM;
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goto out_put_disk;
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}
|
|
|
|
|
2009-05-18 20:38:28 +08:00
|
|
|
vblk->disk->queue->queuedata = vblk;
|
2008-10-27 17:45:15 +08:00
|
|
|
queue_flag_set_unlocked(QUEUE_FLAG_VIRT, vblk->disk->queue);
|
|
|
|
|
2008-02-01 16:05:00 +08:00
|
|
|
if (index < 26) {
|
|
|
|
sprintf(vblk->disk->disk_name, "vd%c", 'a' + index % 26);
|
|
|
|
} else if (index < (26 + 1) * 26) {
|
|
|
|
sprintf(vblk->disk->disk_name, "vd%c%c",
|
|
|
|
'a' + index / 26 - 1, 'a' + index % 26);
|
|
|
|
} else {
|
|
|
|
const unsigned int m1 = (index / 26 - 1) / 26 - 1;
|
|
|
|
const unsigned int m2 = (index / 26 - 1) % 26;
|
|
|
|
const unsigned int m3 = index % 26;
|
|
|
|
sprintf(vblk->disk->disk_name, "vd%c%c%c",
|
|
|
|
'a' + m1, 'a' + m2, 'a' + m3);
|
|
|
|
}
|
|
|
|
|
2007-10-22 09:03:38 +08:00
|
|
|
vblk->disk->major = major;
|
2008-02-01 16:05:00 +08:00
|
|
|
vblk->disk->first_minor = index_to_minor(index);
|
2007-10-22 09:03:38 +08:00
|
|
|
vblk->disk->private_data = vblk;
|
|
|
|
vblk->disk->fops = &virtblk_fops;
|
2008-03-03 06:00:15 +08:00
|
|
|
vblk->disk->driverfs_dev = &vdev->dev;
|
2008-02-01 16:05:00 +08:00
|
|
|
index++;
|
2008-01-31 22:53:53 +08:00
|
|
|
|
2007-10-22 09:03:38 +08:00
|
|
|
/* If barriers are supported, tell block layer that queue is ordered */
|
2008-05-03 10:50:50 +08:00
|
|
|
if (virtio_has_feature(vdev, VIRTIO_BLK_F_BARRIER))
|
2007-10-22 09:03:38 +08:00
|
|
|
blk_queue_ordered(vblk->disk->queue, QUEUE_ORDERED_TAG, NULL);
|
|
|
|
|
2008-05-16 17:17:03 +08:00
|
|
|
/* If disk is read-only in the host, the guest should obey */
|
|
|
|
if (virtio_has_feature(vdev, VIRTIO_BLK_F_RO))
|
|
|
|
set_disk_ro(vblk->disk, 1);
|
|
|
|
|
2008-02-05 12:49:56 +08:00
|
|
|
/* Host must always specify the capacity. */
|
2008-05-03 10:50:49 +08:00
|
|
|
vdev->config->get(vdev, offsetof(struct virtio_blk_config, capacity),
|
|
|
|
&cap, sizeof(cap));
|
2007-10-22 09:03:38 +08:00
|
|
|
|
|
|
|
/* If capacity is too big, truncate with warning. */
|
|
|
|
if ((sector_t)cap != cap) {
|
|
|
|
dev_warn(&vdev->dev, "Capacity %llu too large: truncating\n",
|
|
|
|
(unsigned long long)cap);
|
|
|
|
cap = (sector_t)-1;
|
|
|
|
}
|
|
|
|
set_capacity(vblk->disk, cap);
|
|
|
|
|
2008-12-30 23:26:05 +08:00
|
|
|
/* We can handle whatever the host told us to handle. */
|
|
|
|
blk_queue_max_phys_segments(vblk->disk->queue, vblk->sg_elems-2);
|
|
|
|
blk_queue_max_hw_segments(vblk->disk->queue, vblk->sg_elems-2);
|
|
|
|
|
2009-07-18 11:47:45 +08:00
|
|
|
/* No need to bounce any requests */
|
|
|
|
blk_queue_bounce_limit(vblk->disk->queue, BLK_BOUNCE_ANY);
|
|
|
|
|
2008-12-30 23:26:04 +08:00
|
|
|
/* No real sector limit. */
|
|
|
|
blk_queue_max_sectors(vblk->disk->queue, -1U);
|
|
|
|
|
2008-02-05 12:49:56 +08:00
|
|
|
/* Host can optionally specify maximum segment size and number of
|
|
|
|
* segments. */
|
|
|
|
err = virtio_config_val(vdev, VIRTIO_BLK_F_SIZE_MAX,
|
|
|
|
offsetof(struct virtio_blk_config, size_max),
|
|
|
|
&v);
|
2007-10-22 09:03:38 +08:00
|
|
|
if (!err)
|
|
|
|
blk_queue_max_segment_size(vblk->disk->queue, v);
|
2008-12-30 23:26:04 +08:00
|
|
|
else
|
2008-11-27 05:15:50 +08:00
|
|
|
blk_queue_max_segment_size(vblk->disk->queue, -1U);
|
2007-10-22 09:03:38 +08:00
|
|
|
|
2008-05-29 17:08:26 +08:00
|
|
|
/* Host can optionally specify the block size of the device */
|
|
|
|
err = virtio_config_val(vdev, VIRTIO_BLK_F_BLK_SIZE,
|
|
|
|
offsetof(struct virtio_blk_config, blk_size),
|
|
|
|
&blk_size);
|
|
|
|
if (!err)
|
2009-05-23 05:17:49 +08:00
|
|
|
blk_queue_logical_block_size(vblk->disk->queue, blk_size);
|
2008-05-29 17:08:26 +08:00
|
|
|
|
2007-10-22 09:03:38 +08:00
|
|
|
add_disk(vblk->disk);
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
out_put_disk:
|
|
|
|
put_disk(vblk->disk);
|
|
|
|
out_mempool:
|
|
|
|
mempool_destroy(vblk->pool);
|
|
|
|
out_free_vq:
|
2009-06-13 12:16:36 +08:00
|
|
|
vdev->config->del_vqs(vdev);
|
2007-10-22 09:03:38 +08:00
|
|
|
out_free_vblk:
|
|
|
|
kfree(vblk);
|
|
|
|
out:
|
|
|
|
return err;
|
|
|
|
}
|
|
|
|
|
2009-05-18 15:39:09 +08:00
|
|
|
static void __devexit virtblk_remove(struct virtio_device *vdev)
|
2007-10-22 09:03:38 +08:00
|
|
|
{
|
|
|
|
struct virtio_blk *vblk = vdev->priv;
|
|
|
|
|
2008-02-05 12:50:03 +08:00
|
|
|
/* Nothing should be pending. */
|
2007-10-22 09:03:38 +08:00
|
|
|
BUG_ON(!list_empty(&vblk->reqs));
|
2008-02-05 12:50:03 +08:00
|
|
|
|
|
|
|
/* Stop all the virtqueues. */
|
|
|
|
vdev->config->reset(vdev);
|
|
|
|
|
2008-05-31 04:09:41 +08:00
|
|
|
del_gendisk(vblk->disk);
|
2007-10-22 09:03:38 +08:00
|
|
|
blk_cleanup_queue(vblk->disk->queue);
|
|
|
|
put_disk(vblk->disk);
|
|
|
|
mempool_destroy(vblk->pool);
|
2009-06-13 12:16:36 +08:00
|
|
|
vdev->config->del_vqs(vdev);
|
2007-10-22 09:03:38 +08:00
|
|
|
kfree(vblk);
|
|
|
|
}
|
|
|
|
|
|
|
|
static struct virtio_device_id id_table[] = {
|
|
|
|
{ VIRTIO_ID_BLOCK, VIRTIO_DEV_ANY_ID },
|
|
|
|
{ 0 },
|
|
|
|
};
|
|
|
|
|
2008-05-03 10:50:50 +08:00
|
|
|
static unsigned int features[] = {
|
|
|
|
VIRTIO_BLK_F_BARRIER, VIRTIO_BLK_F_SEG_MAX, VIRTIO_BLK_F_SIZE_MAX,
|
2008-05-29 17:08:26 +08:00
|
|
|
VIRTIO_BLK_F_GEOMETRY, VIRTIO_BLK_F_RO, VIRTIO_BLK_F_BLK_SIZE,
|
2009-06-09 20:41:40 +08:00
|
|
|
VIRTIO_BLK_F_SCSI, VIRTIO_BLK_F_IDENTIFY
|
2008-05-03 10:50:50 +08:00
|
|
|
};
|
|
|
|
|
virtio_blk: mark virtio_blk with __refdata to kill spurious section mismatch
The variable virtio_blk references the function virtblk_probe() (which
is in .devinit section) and also references the function
virtblk_remove() ( which is in .devexit section). So, virtio_blk
simultaneously refers .devinit and .devexit section. To avoid this
messup, we mark virtio_blk as __refdata.
We were warned by the following warning:
LD drivers/block/built-in.o
WARNING: drivers/block/built-in.o(.data+0xc8dc): Section mismatch in
reference from the variable virtio_blk to the function
.devinit.text:virtblk_probe()
The variable virtio_blk references
the function __devinit virtblk_probe()
If the reference is valid then annotate the
variable with __init* or __refdata (see linux/init.h) or name the variable:
*driver, *_template, *_timer, *_sht, *_ops, *_probe, *_probe_one, *_console,
WARNING: drivers/block/built-in.o(.data+0xc8e0): Section mismatch in
reference from the variable virtio_blk to the function
.devexit.text:virtblk_remove()
The variable virtio_blk references
the function __devexit virtblk_remove()
If the reference is valid then annotate the
variable with __exit* (see linux/init.h) or name the variable:
*driver, *_template, *_timer, *_sht, *_ops, *_probe, *_probe_one, *_console,
Signed-off-by: Rakib Mullick <rakib.mullick@gmail.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
2009-07-17 22:13:22 +08:00
|
|
|
/*
|
|
|
|
* virtio_blk causes spurious section mismatch warning by
|
|
|
|
* simultaneously referring to a __devinit and a __devexit function.
|
|
|
|
* Use __refdata to avoid this warning.
|
|
|
|
*/
|
|
|
|
static struct virtio_driver __refdata virtio_blk = {
|
2008-05-03 10:50:50 +08:00
|
|
|
.feature_table = features,
|
|
|
|
.feature_table_size = ARRAY_SIZE(features),
|
2007-10-22 09:03:38 +08:00
|
|
|
.driver.name = KBUILD_MODNAME,
|
|
|
|
.driver.owner = THIS_MODULE,
|
|
|
|
.id_table = id_table,
|
|
|
|
.probe = virtblk_probe,
|
|
|
|
.remove = __devexit_p(virtblk_remove),
|
|
|
|
};
|
|
|
|
|
|
|
|
static int __init init(void)
|
|
|
|
{
|
2008-01-31 22:53:53 +08:00
|
|
|
major = register_blkdev(0, "virtblk");
|
|
|
|
if (major < 0)
|
|
|
|
return major;
|
2007-10-22 09:03:38 +08:00
|
|
|
return register_virtio_driver(&virtio_blk);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void __exit fini(void)
|
|
|
|
{
|
2008-01-31 22:53:53 +08:00
|
|
|
unregister_blkdev(major, "virtblk");
|
2007-10-22 09:03:38 +08:00
|
|
|
unregister_virtio_driver(&virtio_blk);
|
|
|
|
}
|
|
|
|
module_init(init);
|
|
|
|
module_exit(fini);
|
|
|
|
|
|
|
|
MODULE_DEVICE_TABLE(virtio, id_table);
|
|
|
|
MODULE_DESCRIPTION("Virtio block driver");
|
|
|
|
MODULE_LICENSE("GPL");
|