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authorMike Christie <michael.christie@oracle.com>2021-02-27 19:59:58 +0300
committerMartin K. Petersen <martin.petersen@oracle.com>2021-03-05 01:37:02 +0300
commit6ec29cb8ad333c1b4efd3acaf7451538c30220ae (patch)
tree18c92a8775e8e3a6faa89d88a29252e0f63218c3 /drivers/vhost
parenteb44ce8c8c7d3b45f9204c7f34577960c00d5919 (diff)
downloadlinux-6ec29cb8ad333c1b4efd3acaf7451538c30220ae.tar.xz
scsi: target: vhost-scsi: Use LIO wq cmd submission helper
Convert vhost-scsi to use the LIO wq cmd submission helper. Link: https://lore.kernel.org/r/20210227170006.5077-18-michael.christie@oracle.com Signed-off-by: Mike Christie <michael.christie@oracle.com> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'drivers/vhost')
-rw-r--r--drivers/vhost/scsi.c36
1 files changed, 6 insertions, 30 deletions
diff --git a/drivers/vhost/scsi.c b/drivers/vhost/scsi.c
index 9b448a197cb5..d16c04dcc144 100644
--- a/drivers/vhost/scsi.c
+++ b/drivers/vhost/scsi.c
@@ -85,7 +85,7 @@ struct vhost_scsi_cmd {
/* The number of scatterlists associated with this cmd */
u32 tvc_sgl_count;
u32 tvc_prot_sgl_count;
- /* Saved unpacked SCSI LUN for vhost_scsi_submission_work() */
+ /* Saved unpacked SCSI LUN for vhost_scsi_target_queue_cmd() */
u32 tvc_lun;
/* Pointer to the SGL formatted memory from virtio-scsi */
struct scatterlist *tvc_sgl;
@@ -101,8 +101,6 @@ struct vhost_scsi_cmd {
struct vhost_scsi_nexus *tvc_nexus;
/* The TCM I/O descriptor that is accessed via container_of() */
struct se_cmd tvc_se_cmd;
- /* work item used for cmwq dispatch to vhost_scsi_submission_work() */
- struct work_struct work;
/* Copy of the incoming SCSI command descriptor block (CDB) */
unsigned char tvc_cdb[VHOST_SCSI_MAX_CDB_SIZE];
/* Sense buffer that will be mapped into outgoing status */
@@ -240,8 +238,6 @@ struct vhost_scsi_ctx {
struct iov_iter out_iter;
};
-static struct workqueue_struct *vhost_scsi_workqueue;
-
/* Global spinlock to protect vhost_scsi TPG list for vhost IOCTL access */
static DEFINE_MUTEX(vhost_scsi_mutex);
static LIST_HEAD(vhost_scsi_list);
@@ -782,12 +778,10 @@ static int vhost_scsi_to_tcm_attr(int attr)
return TCM_SIMPLE_TAG;
}
-static void vhost_scsi_submission_work(struct work_struct *work)
+static void vhost_scsi_target_queue_cmd(struct vhost_scsi_cmd *cmd)
{
- struct vhost_scsi_cmd *cmd =
- container_of(work, struct vhost_scsi_cmd, work);
- struct vhost_scsi_nexus *tv_nexus;
struct se_cmd *se_cmd = &cmd->tvc_se_cmd;
+ struct vhost_scsi_nexus *tv_nexus;
struct scatterlist *sg_ptr, *sg_prot_ptr = NULL;
/* FIXME: BIDI operation */
@@ -814,7 +808,7 @@ static void vhost_scsi_submission_work(struct work_struct *work)
cmd->tvc_prot_sgl_count, GFP_KERNEL))
return;
- target_submit(se_cmd);
+ target_queue_submission(se_cmd);
}
static void
@@ -1130,14 +1124,7 @@ vhost_scsi_handle_vq(struct vhost_scsi *vs, struct vhost_virtqueue *vq)
* vhost_scsi_queue_data_in() and vhost_scsi_queue_status()
*/
cmd->tvc_vq_desc = vc.head;
- /*
- * Dispatch cmd descriptor for cmwq execution in process
- * context provided by vhost_scsi_workqueue. This also ensures
- * cmd is executed on the same kworker CPU as this vhost
- * thread to gain positive L2 cache locality effects.
- */
- INIT_WORK(&cmd->work, vhost_scsi_submission_work);
- queue_work(vhost_scsi_workqueue, &cmd->work);
+ vhost_scsi_target_queue_cmd(cmd);
ret = 0;
err:
/*
@@ -2484,17 +2471,9 @@ static int __init vhost_scsi_init(void)
" on "UTS_RELEASE"\n", VHOST_SCSI_VERSION, utsname()->sysname,
utsname()->machine);
- /*
- * Use our own dedicated workqueue for submitting I/O into
- * target core to avoid contention within system_wq.
- */
- vhost_scsi_workqueue = alloc_workqueue("vhost_scsi", 0, 0);
- if (!vhost_scsi_workqueue)
- goto out;
-
ret = vhost_scsi_register();
if (ret < 0)
- goto out_destroy_workqueue;
+ goto out;
ret = target_register_template(&vhost_scsi_ops);
if (ret < 0)
@@ -2504,8 +2483,6 @@ static int __init vhost_scsi_init(void)
out_vhost_scsi_deregister:
vhost_scsi_deregister();
-out_destroy_workqueue:
- destroy_workqueue(vhost_scsi_workqueue);
out:
return ret;
};
@@ -2514,7 +2491,6 @@ static void vhost_scsi_exit(void)
{
target_unregister_template(&vhost_scsi_ops);
vhost_scsi_deregister();
- destroy_workqueue(vhost_scsi_workqueue);
};
MODULE_DESCRIPTION("VHOST_SCSI series fabric driver");