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| author | Kashyap Desai <kashyap.desai@broadcom.com> | 2021-02-15 13:10:44 +0530 |
|---|---|---|
| committer | Martin K. Petersen <martin.petersen@oracle.com> | 2021-03-04 17:37:03 -0500 |
| commit | af1830956dc3dca0c87b2d679f7c91a8fe0331e1 (patch) | |
| tree | c8785a790eae473757002a5dddafe344a98cdbe9 | |
| parent | 39ae3edda325e9cf9e978c9788affe88231f3b34 (diff) | |
| download | linux-af1830956dc3dca0c87b2d679f7c91a8fe0331e1.tar.gz | |
scsi: core: Add mq_poll support to SCSI layer
Currently IOPOLL support is only available in block layer. This patch adds mq_poll support to the SCSI layer. Link: https://lore.kernel.org/r/20210215074048.19424-2-kashyap.desai@broadcom.com Cc: sumit.saxena@broadcom.com Cc: chandrakanth.patil@broadcom.com Cc: linux-block@vger.kernel.org Reviewed-by: Hannes Reinecke <hare@suse.de> Reviewed-by: John Garry <john.garry@huawei.com> Signed-off-by: Kashyap Desai <kashyap.desai@broadcom.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
| -rw-r--r-- | drivers/scsi/scsi_lib.c | 16 | ||||
| -rw-r--r-- | include/scsi/scsi_cmnd.h | 1 | ||||
| -rw-r--r-- | include/scsi/scsi_host.h | 11 |
3 files changed, 28 insertions, 0 deletions
diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c index ffe824782647..09d09ef9d193 100644 --- a/drivers/scsi/scsi_lib.c +++ b/drivers/scsi/scsi_lib.c @@ -1810,6 +1810,19 @@ static void scsi_mq_exit_request(struct blk_mq_tag_set *set, struct request *rq, cmd->sense_buffer); } + +static int scsi_mq_poll(struct blk_mq_hw_ctx *hctx) +{ + struct request_queue *q = hctx->queue; + struct scsi_device *sdev = q->queuedata; + struct Scsi_Host *shost = sdev->host; + + if (shost->hostt->mq_poll) + return shost->hostt->mq_poll(shost, hctx->queue_num); + + return 0; +} + static int scsi_map_queues(struct blk_mq_tag_set *set) { struct Scsi_Host *shost = container_of(set, struct Scsi_Host, tag_set); @@ -1877,6 +1890,7 @@ static const struct blk_mq_ops scsi_mq_ops_no_commit = { .cleanup_rq = scsi_cleanup_rq, .busy = scsi_mq_lld_busy, .map_queues = scsi_map_queues, + .poll = scsi_mq_poll, .set_rq_budget_token = scsi_mq_set_rq_budget_token, .get_rq_budget_token = scsi_mq_get_rq_budget_token, }; @@ -1907,6 +1921,7 @@ static const struct blk_mq_ops scsi_mq_ops = { .cleanup_rq = scsi_cleanup_rq, .busy = scsi_mq_lld_busy, .map_queues = scsi_map_queues, + .poll = scsi_mq_poll, .set_rq_budget_token = scsi_mq_set_rq_budget_token, .get_rq_budget_token = scsi_mq_get_rq_budget_token, }; @@ -1941,6 +1956,7 @@ int scsi_mq_setup_tags(struct Scsi_Host *shost) else tag_set->ops = &scsi_mq_ops_no_commit; tag_set->nr_hw_queues = shost->nr_hw_queues ? : 1; + tag_set->nr_maps = shost->nr_maps ? : 1; tag_set->queue_depth = shost->can_queue; tag_set->cmd_size = cmd_size; tag_set->numa_node = NUMA_NO_NODE; diff --git a/include/scsi/scsi_cmnd.h b/include/scsi/scsi_cmnd.h index 0cf2b5ccc1f7..83f7e520be48 100644 --- a/include/scsi/scsi_cmnd.h +++ b/include/scsi/scsi_cmnd.h @@ -10,6 +10,7 @@ #include <linux/timer.h> #include <linux/scatterlist.h> #include <scsi/scsi_device.h> +#include <scsi/scsi_host.h> #include <scsi/scsi_request.h> struct Scsi_Host; diff --git a/include/scsi/scsi_host.h b/include/scsi/scsi_host.h index f0e8a9e73002..d95c1502e17d 100644 --- a/include/scsi/scsi_host.h +++ b/include/scsi/scsi_host.h @@ -281,6 +281,16 @@ struct scsi_host_template { int (* map_queues)(struct Scsi_Host *shost); /* + * SCSI interface of blk_poll - poll for IO completions. + * Only applicable if SCSI LLD exposes multiple h/w queues. + * + * Return value: Number of completed entries found. + * + * Status: OPTIONAL + */ + int (* mq_poll)(struct Scsi_Host *shost, unsigned int queue_num); + + /* * Check if scatterlists need to be padded for DMA draining. * * Status: OPTIONAL @@ -622,6 +632,7 @@ struct Scsi_Host { * the total queue depth is can_queue. */ unsigned nr_hw_queues; + unsigned nr_maps; unsigned active_mode:2; unsigned unchecked_isa_dma:1; |