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scsi: Add host and host template flag 'host_tagset'

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Add Host and host template flag 'host_tagset' so hostwide tagset can be
shared on multiple reply queues after the SCSI device's reply queue is
converted to blk-mq hw queue.

[jpg: Update comment on .can_queue and add Scsi_Host.host_tagset]

Signed-off-by: Hannes Reinecke <hare@suse.com>
Signed-off-by: John Garry <john.garry@huawei.com>
Tested-by: Don Brace<don.brace@microsemi.com> #SCSI resv cmds patches used
Tested-by: Douglas Gilbert <dgilbert@interlog.com>
Acked-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Hannes Reinecke 2020-08-19 23:20:30 +08:00 committed by Jens Axboe
parent f5ace5ef37
commit bdb01301f3
3 changed files with 11 additions and 1 deletions
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1
drivers/scsi/hosts.c
View File

@ -421,6 +421,7 @@ struct Scsi_Host *scsi_host_alloc(struct scsi_host_template *sht, int privsize)
shost->cmd_per_lun = sht->cmd_per_lun;
shost->unchecked_isa_dma = sht->unchecked_isa_dma;
shost->no_write_same = sht->no_write_same;
shost->host_tagset = sht->host_tagset;
if (shost_eh_deadline == -1 || !sht->eh_host_reset_handler)
shost->eh_deadline = -1;

2
drivers/scsi/scsi_lib.c
View File

@ -1891,6 +1891,8 @@ int scsi_mq_setup_tags(struct Scsi_Host *shost)
tag_set->flags |=
BLK_ALLOC_POLICY_TO_MQ_FLAG(shost->hostt->tag_alloc_policy);
tag_set->driver_data = shost;
if (shost->host_tagset)
tag_set->flags |= BLK_MQ_F_TAG_HCTX_SHARED;
return blk_mq_alloc_tag_set(tag_set);
}

9
include/scsi/scsi_host.h
View File

@ -436,6 +436,9 @@ struct scsi_host_template {
/* True if the controller does not support WRITE SAME */
unsigned no_write_same:1;
/* True if the host uses host-wide tagspace */
unsigned host_tagset:1;
/*
* Countdown for host blocking with no commands outstanding.
*/
@ -603,7 +606,8 @@ struct Scsi_Host {
*
* Note: it is assumed that each hardware queue has a queue depth of
* can_queue. In other words, the total queue depth per host
* is nr_hw_queues * can_queue.
* is nr_hw_queues * can_queue. However, for when host_tagset is set,
* the total queue depth is can_queue.
*/
unsigned nr_hw_queues;
unsigned active_mode:2;
@ -634,6 +638,9 @@ struct Scsi_Host {
/* The controller does not support WRITE SAME */
unsigned no_write_same:1;
/* True if the host uses host-wide tagspace */
unsigned host_tagset:1;
/* Host responded with short (<36 bytes) INQUIRY result */
unsigned short_inquiry:1;