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scsi: core: Add mq_poll support to SCSI layer

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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>
This commit is contained in:
Kashyap Desai 2021-02-15 13:10:44 +05:30 committed by Martin K. Petersen
parent 39ae3edda3
commit af1830956d
3 changed files with 28 additions and 0 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

16
drivers/scsi/scsi_lib.c
View file

@ -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;

1
include/scsi/scsi_cmnd.h
View file

@ -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;

11
include/scsi/scsi_host.h
View file

@ -280,6 +280,16 @@ 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.
*
@ -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;