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Commit 2f31115e authored by Ming Lei's avatar Ming Lei Committed by Martin K. Petersen
Browse files

scsi: core: introduce force_blk_mq 



This patch introduces 'force_blk_mq' to the scsi_host_template so that
drivers that have no desire to support the legacy I/O path can signal
blk-mq only support.

[mkp: commit desc]

Cc: Omar Sandoval <osandov@fb.com>,
Cc: "Martin K. Petersen" <martin.petersen@oracle.com>,
Cc: James Bottomley <james.bottomley@hansenpartnership.com>,
Cc: Christoph Hellwig <hch@lst.de>,
Cc: Don Brace <don.brace@microsemi.com>
Cc: Kashyap Desai <kashyap.desai@broadcom.com>
Cc: Mike Snitzer <snitzer@redhat.com>
Cc: Laurence Oberman <loberman@redhat.com>
Signed-off-by: default avatarMing Lei <ming.lei@redhat.com>
Reviewed-by: default avatarHannes Reinecke <hare@suse.de>
Reviewed-by: default avatarChristoph Hellwig <hch@lst.de>
Signed-off-by: default avatarMartin K. Petersen <martin.petersen@oracle.com>
parent adbe5523

drivers/scsi/hosts.c

+1 −0
Original line number Diff line number Diff line
@@ -474,6 +474,7 @@ struct Scsi_Host *scsi_host_alloc(struct scsi_host_template *sht, int privsize) 
		shost->dma_boundary = 0xffffffff;



	shost->use_blk_mq = scsi_use_blk_mq;

	shost->use_blk_mq = scsi_use_blk_mq || shost->hostt->force_blk_mq;



	device_initialize(&shost->shost_gendev);

	dev_set_name(&shost->shost_gendev, "host%d", shost->host_no);

include/scsi/scsi_host.h

+3 −0
Original line number Diff line number Diff line
@@ -452,6 +452,9 @@ struct scsi_host_template { 
	/* True if the controller does not support WRITE SAME */

	unsigned no_write_same:1;



	/* True if the low-level driver supports blk-mq only */

	unsigned force_blk_mq:1;



	/*

	 * Countdown for host blocking with no commands outstanding.

	 */