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scsi: virtio_scsi: unify scsi_host_template

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Now that virtio_scsi uses blk-mq exclusively, we can remove the
scsi_host_template and associated plumbing for the legacy I/O path.

[mkp: commit desc]

Cc: Omar Sandoval <osandov@fb.com>,
Cc: "Martin K. Petersen" <martin.petersen@oracle.com>,
Cc: James Bottomley <james.bottomley@hansenpartnership.com>,
Cc: Christoph Hellwig <hch@lst.de>,
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Mike Snitzer <snitzer@redhat.com>
Cc: Laurence Oberman <loberman@redhat.com>
Cc: Hannes Reinecke <hare@suse.de>
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Suggested-by: Christoph Hellwig <hch@lst.de>,
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Ming Lei 2018-03-13 17:42:43 +08:00 committed by Martin K. Petersen
parent b5b6e8c8d3
commit c3506df850
1 changed files with 15 additions and 59 deletions
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74
drivers/scsi/virtio_scsi.c
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@ -522,11 +522,20 @@ static void virtio_scsi_init_hdr_pi(struct virtio_device *vdev,
}
#endif
static int virtscsi_queuecommand(struct virtio_scsi *vscsi,
struct virtio_scsi_vq *req_vq,
static struct virtio_scsi_vq *virtscsi_pick_vq_mq(struct virtio_scsi *vscsi,
struct scsi_cmnd *sc)
{
u32 tag = blk_mq_unique_tag(sc->request);
u16 hwq = blk_mq_unique_tag_to_hwq(tag);
return &vscsi->req_vqs[hwq];
}
static int virtscsi_queuecommand(struct Scsi_Host *shost,
struct scsi_cmnd *sc)
{
struct Scsi_Host *shost = virtio_scsi_host(vscsi->vdev);
struct virtio_scsi *vscsi = shost_priv(shost);
struct virtio_scsi_vq *req_vq = virtscsi_pick_vq_mq(vscsi, sc);
struct virtio_scsi_cmd *cmd = scsi_cmd_priv(sc);
unsigned long flags;
int req_size;
@ -569,32 +578,6 @@ static int virtscsi_queuecommand(struct virtio_scsi *vscsi,
return 0;
}
static int virtscsi_queuecommand_single(struct Scsi_Host *sh,
struct scsi_cmnd *sc)
{
struct virtio_scsi *vscsi = shost_priv(sh);
return virtscsi_queuecommand(vscsi, &vscsi->req_vqs[0], sc);
}
static struct virtio_scsi_vq *virtscsi_pick_vq_mq(struct virtio_scsi *vscsi,
struct scsi_cmnd *sc)
{
u32 tag = blk_mq_unique_tag(sc->request);
u16 hwq = blk_mq_unique_tag_to_hwq(tag);
return &vscsi->req_vqs[hwq];
}
static int virtscsi_queuecommand_multi(struct Scsi_Host *sh,
struct scsi_cmnd *sc)
{
struct virtio_scsi *vscsi = shost_priv(sh);
struct virtio_scsi_vq *req_vq = virtscsi_pick_vq_mq(vscsi, sc);
return virtscsi_queuecommand(vscsi, req_vq, sc);
}
static int virtscsi_tmf(struct virtio_scsi *vscsi, struct virtio_scsi_cmd *cmd)
{
DECLARE_COMPLETION_ONSTACK(comp);
@ -750,34 +733,13 @@ static enum blk_eh_timer_return virtscsi_eh_timed_out(struct scsi_cmnd *scmnd)
return BLK_EH_RESET_TIMER;
}
static struct scsi_host_template virtscsi_host_template_single = {
static struct scsi_host_template virtscsi_host_template = {
.module = THIS_MODULE,
.name = "Virtio SCSI HBA",
.proc_name = "virtio_scsi",
.this_id = -1,
.cmd_size = sizeof(struct virtio_scsi_cmd),
.queuecommand = virtscsi_queuecommand_single,
.change_queue_depth = virtscsi_change_queue_depth,
.eh_abort_handler = virtscsi_abort,
.eh_device_reset_handler = virtscsi_device_reset,
.eh_timed_out = virtscsi_eh_timed_out,
.slave_alloc = virtscsi_device_alloc,
.dma_boundary = UINT_MAX,
.use_clustering = ENABLE_CLUSTERING,
.target_alloc = virtscsi_target_alloc,
.target_destroy = virtscsi_target_destroy,
.track_queue_depth = 1,
.force_blk_mq = 1,
};
static struct scsi_host_template virtscsi_host_template_multi = {
.module = THIS_MODULE,
.name = "Virtio SCSI HBA",
.proc_name = "virtio_scsi",
.this_id = -1,
.cmd_size = sizeof(struct virtio_scsi_cmd),
.queuecommand = virtscsi_queuecommand_multi,
.queuecommand = virtscsi_queuecommand,
.change_queue_depth = virtscsi_change_queue_depth,
.eh_abort_handler = virtscsi_abort,
.eh_device_reset_handler = virtscsi_device_reset,
@ -883,7 +845,6 @@ static int virtscsi_probe(struct virtio_device *vdev)
u32 sg_elems, num_targets;
u32 cmd_per_lun;
u32 num_queues;
struct scsi_host_template *hostt;
if (!vdev->config->get) {
dev_err(&vdev->dev, "%s failure: config access disabled\n",
@ -896,12 +857,7 @@ static int virtscsi_probe(struct virtio_device *vdev)
num_targets = virtscsi_config_get(vdev, max_target) + 1;
if (num_queues == 1)
hostt = &virtscsi_host_template_single;
else
hostt = &virtscsi_host_template_multi;
shost = scsi_host_alloc(hostt,
shost = scsi_host_alloc(&virtscsi_host_template,
sizeof(*vscsi) + sizeof(vscsi->req_vqs[0]) * num_queues);
if (!shost)
return -ENOMEM;