From c3506df85091ab41cf7716244c460e15136100c4 Mon Sep 17 00:00:00 2001 From: Ming Lei Date: Tue, 13 Mar 2018 17:42:43 +0800 Subject: scsi: virtio_scsi: unify scsi_host_template 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 , Cc: "Martin K. Petersen" , Cc: James Bottomley , Cc: Christoph Hellwig , Cc: Paolo Bonzini Cc: Mike Snitzer Cc: Laurence Oberman Cc: Hannes Reinecke Signed-off-by: Ming Lei Suggested-by: Christoph Hellwig , Reviewed-by: Christoph Hellwig Signed-off-by: Martin K. Petersen --- drivers/scsi/virtio_scsi.c | 74 ++++++++++------------------------------------ 1 file changed, 15 insertions(+), 59 deletions(-) (limited to 'drivers/scsi/virtio_scsi.c') diff --git a/drivers/scsi/virtio_scsi.c b/drivers/scsi/virtio_scsi.c index 54e3a0f6844c..45d04631888a 100644 --- a/drivers/scsi/virtio_scsi.c +++ b/drivers/scsi/virtio_scsi.c @@ -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 = { - .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 = { +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_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; -- cgit