From: Hannes Reinecke <hare@suse.de>
To: "Martin K. Petersen" <martin.petersen@oracle.com>
Cc: Jens Axboe <axboe@kernel.dk>, Christoph Hellwig <hch@lst.de>,
James Bottomley <james.bottomley@hansenpartnership.com>,
John Garry <john.garry@huawei.com>,
Ming Lei <ming.lei@redhat.com>,
linux-scsi@vger.kernel.org, linux-block@vger.kernel.org,
Hannes Reinecke <hare@suse.de>
Subject: [PATCH 10/11] smartpqi: enable host tagset
Date: Mon, 2 Dec 2019 16:39:13 +0100 [thread overview]
Message-ID: <20191202153914.84722-11-hare@suse.de> (raw)
In-Reply-To: <20191202153914.84722-1-hare@suse.de>
Enable host tagset for smartpqi; with this we can use the request
tag to look command from the pool avoiding the list iteration in
the hot path.
Signed-off-by: Hannes Reinecke <hare@suse.de>
---
drivers/scsi/smartpqi/smartpqi_init.c | 38 ++++++++++++++++++++++++++---------
1 file changed, 28 insertions(+), 10 deletions(-)
diff --git a/drivers/scsi/smartpqi/smartpqi_init.c b/drivers/scsi/smartpqi/smartpqi_init.c
index 7b7ef3acb504..c17b533c84ad 100644
--- a/drivers/scsi/smartpqi/smartpqi_init.c
+++ b/drivers/scsi/smartpqi/smartpqi_init.c
@@ -575,17 +575,29 @@ static inline void pqi_reinit_io_request(struct pqi_io_request *io_request)
}
static struct pqi_io_request *pqi_alloc_io_request(
- struct pqi_ctrl_info *ctrl_info)
+ struct pqi_ctrl_info *ctrl_info, struct scsi_cmnd *scmd)
{
struct pqi_io_request *io_request;
+ unsigned int limit = PQI_RESERVED_IO_SLOTS;
u16 i = ctrl_info->next_io_request_slot; /* benignly racy */
- while (1) {
+ if (scmd) {
+ u32 blk_tag = blk_mq_unique_tag(scmd->request);
+
+ i = blk_mq_unique_tag_to_tag(blk_tag) + limit;
io_request = &ctrl_info->io_request_pool[i];
- if (atomic_inc_return(&io_request->refcount) == 1)
- break;
- atomic_dec(&io_request->refcount);
- i = (i + 1) % ctrl_info->max_io_slots;
+ if (WARN_ON(atomic_inc_return(&io_request->refcount) > 1)) {
+ atomic_dec(&io_request->refcount);
+ return NULL;
+ }
+ } else {
+ while (1) {
+ io_request = &ctrl_info->io_request_pool[i];
+ if (atomic_inc_return(&io_request->refcount) == 1)
+ break;
+ atomic_dec(&io_request->refcount);
+ i = (i + 1) % limit;
+ }
}
/* benignly racy */
@@ -4075,7 +4087,7 @@ static int pqi_submit_raid_request_synchronous(struct pqi_ctrl_info *ctrl_info,
atomic_inc(&ctrl_info->sync_cmds_outstanding);
- io_request = pqi_alloc_io_request(ctrl_info);
+ io_request = pqi_alloc_io_request(ctrl_info, NULL);
put_unaligned_le16(io_request->index,
&(((struct pqi_raid_path_request *)request)->request_id));
@@ -5032,7 +5044,9 @@ static inline int pqi_raid_submit_scsi_cmd(struct pqi_ctrl_info *ctrl_info,
{
struct pqi_io_request *io_request;
- io_request = pqi_alloc_io_request(ctrl_info);
+ io_request = pqi_alloc_io_request(ctrl_info, scmd);
+ if (!io_request)
+ return SCSI_MLQUEUE_HOST_BUSY;
return pqi_raid_submit_scsi_cmd_with_io_request(ctrl_info, io_request,
device, scmd, queue_group);
@@ -5230,7 +5244,10 @@ static int pqi_aio_submit_io(struct pqi_ctrl_info *ctrl_info,
struct pqi_io_request *io_request;
struct pqi_aio_path_request *request;
- io_request = pqi_alloc_io_request(ctrl_info);
+ io_request = pqi_alloc_io_request(ctrl_info, scmd);
+ if (!io_request)
+ return SCSI_MLQUEUE_HOST_BUSY;
+
io_request->io_complete_callback = pqi_aio_io_complete;
io_request->scmd = scmd;
io_request->raid_bypass = raid_bypass;
@@ -5657,7 +5674,7 @@ static int pqi_lun_reset(struct pqi_ctrl_info *ctrl_info,
DECLARE_COMPLETION_ONSTACK(wait);
struct pqi_task_management_request *request;
- io_request = pqi_alloc_io_request(ctrl_info);
+ io_request = pqi_alloc_io_request(ctrl_info, NULL);
io_request->io_complete_callback = pqi_lun_reset_complete;
io_request->context = &wait;
@@ -6504,6 +6521,7 @@ static struct scsi_host_template pqi_driver_template = {
.map_queues = pqi_map_queues,
.sdev_attrs = pqi_sdev_attrs,
.shost_attrs = pqi_shost_attrs,
+ .host_tagset = 1,
};
static int pqi_register_scsi(struct pqi_ctrl_info *ctrl_info)
--
2.16.4
next prev parent reply other threads:[~2019-12-02 15:39 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-12-02 15:39 [PATCH RFC v5 00/11] blk-mq/scsi: Provide hostwide shared tags for SCSI HBAs Hannes Reinecke
2019-12-02 15:39 ` [PATCH 01/11] blk-mq: Remove some unused function arguments Hannes Reinecke
2019-12-02 15:39 ` [PATCH 02/11] blk-mq: rename BLK_MQ_F_TAG_SHARED as BLK_MQ_F_TAG_QUEUE_SHARED Hannes Reinecke
2019-12-02 15:39 ` [PATCH 03/11] blk-mq: rename blk_mq_update_tag_set_depth() Hannes Reinecke
2019-12-03 14:30 ` John Garry
2019-12-03 14:53 ` Hannes Reinecke
2019-12-02 15:39 ` [PATCH 04/11] blk-mq: Facilitate a shared sbitmap per tagset Hannes Reinecke
2019-12-03 14:54 ` John Garry
2019-12-03 15:02 ` Hannes Reinecke
2019-12-04 10:24 ` John Garry
2019-12-03 16:38 ` Bart Van Assche
2019-12-02 15:39 ` [PATCH 05/11] blk-mq: add WARN_ON in blk_mq_free_rqs() Hannes Reinecke
2019-12-02 15:39 ` [PATCH 06/11] blk-mq: move shared sbitmap into elevator queue Hannes Reinecke
2019-12-02 15:39 ` [PATCH 07/11] scsi: Add template flag 'host_tagset' Hannes Reinecke
2019-12-02 15:39 ` [PATCH 08/11] scsi: hisi_sas: Switch v3 hw to MQ Hannes Reinecke
2019-12-02 15:39 ` [PATCH 09/11] megaraid_sas: switch fusion adapters " Hannes Reinecke
2019-12-09 10:10 ` Sumit Saxena
2019-12-09 11:02 ` Hannes Reinecke
2020-01-10 4:00 ` Sumit Saxena
2020-01-10 12:18 ` John Garry
2020-01-13 17:42 ` John Garry
2020-01-14 7:05 ` Hannes Reinecke
2020-01-16 15:47 ` John Garry
2020-01-16 17:45 ` Hannes Reinecke
2020-01-17 11:40 ` Sumit Saxena
2020-01-17 11:18 ` Sumit Saxena
2020-02-13 10:07 ` John Garry
2020-02-17 10:09 ` Sumit Saxena
2020-01-09 11:55 ` John Garry
2020-01-09 15:19 ` Hannes Reinecke
2020-01-09 18:17 ` John Garry
2020-01-10 2:00 ` Ming Lei
2020-01-10 12:09 ` John Garry
2020-01-14 13:57 ` John Garry
2019-12-02 15:39 ` Hannes Reinecke [this message]
2019-12-02 15:39 ` [PATCH 11/11] hpsa: enable host_tagset and switch " Hannes Reinecke
2020-02-26 11:09 ` [PATCH RFC v5 00/11] blk-mq/scsi: Provide hostwide shared tags for SCSI HBAs John Garry
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