scsi: Add host and host template flag 'host_tagset'
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>
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@ -421,6 +421,7 @@ struct Scsi_Host *scsi_host_alloc(struct scsi_host_template *sht, int privsize)
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shost->cmd_per_lun = sht->cmd_per_lun;
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shost->unchecked_isa_dma = sht->unchecked_isa_dma;
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shost->no_write_same = sht->no_write_same;
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shost->host_tagset = sht->host_tagset;
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if (shost_eh_deadline == -1 || !sht->eh_host_reset_handler)
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shost->eh_deadline = -1;
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@ -1891,6 +1891,8 @@ int scsi_mq_setup_tags(struct Scsi_Host *shost)
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tag_set->flags |=
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BLK_ALLOC_POLICY_TO_MQ_FLAG(shost->hostt->tag_alloc_policy);
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tag_set->driver_data = shost;
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if (shost->host_tagset)
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tag_set->flags |= BLK_MQ_F_TAG_HCTX_SHARED;
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return blk_mq_alloc_tag_set(tag_set);
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}
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@ -436,6 +436,9 @@ struct scsi_host_template {
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/* True if the controller does not support WRITE SAME */
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unsigned no_write_same:1;
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/* True if the host uses host-wide tagspace */
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unsigned host_tagset:1;
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/*
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* Countdown for host blocking with no commands outstanding.
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*/
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@ -603,7 +606,8 @@ struct Scsi_Host {
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*
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* Note: it is assumed that each hardware queue has a queue depth of
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* can_queue. In other words, the total queue depth per host
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* is nr_hw_queues * can_queue.
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* is nr_hw_queues * can_queue. However, for when host_tagset is set,
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* the total queue depth is can_queue.
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*/
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unsigned nr_hw_queues;
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unsigned active_mode:2;
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@ -634,6 +638,9 @@ struct Scsi_Host {
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/* The controller does not support WRITE SAME */
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unsigned no_write_same:1;
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/* True if the host uses host-wide tagspace */
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unsigned host_tagset:1;
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/* Host responded with short (<36 bytes) INQUIRY result */
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unsigned short_inquiry:1;
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