linux-kernel - [PATCH 4.14 004/104] scsi: core: introduce force_blk

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Date:   Tue, 14 Aug 2018 19:16:18 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Don Brace <don.brace@...rosemi.com>,
        Kashyap Desai <kashyap.desai@...adcom.com>,
        Mike Snitzer <snitzer@...hat.com>,
        Laurence Oberman <loberman@...hat.com>,
        Ming Lei <ming.lei@...hat.com>, Hannes Reinecke <hare@...e.de>,
        Christoph Hellwig <hch@....de>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Omar Sandoval <osandov@...com>,
        James Bottomley <james.bottomley@...senpartnership.com>
Subject: [PATCH 4.14 004/104] scsi: core: introduce force_blk_mq

4.14-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Ming Lei <ming.lei@...hat.com>

commit 2f31115e940c4afd49b99c33123534e2ac924ffb upstream.

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@...com>,
Cc: "Martin K. Petersen" <martin.petersen@...cle.com>,
Cc: James Bottomley <james.bottomley@...senpartnership.com>,
Cc: Christoph Hellwig <hch@....de>,
Cc: Don Brace <don.brace@...rosemi.com>
Cc: Kashyap Desai <kashyap.desai@...adcom.com>
Cc: Mike Snitzer <snitzer@...hat.com>
Cc: Laurence Oberman <loberman@...hat.com>
Signed-off-by: Ming Lei <ming.lei@...hat.com>
Reviewed-by: Hannes Reinecke <hare@...e.de>
Reviewed-by: Christoph Hellwig <hch@....de>
Signed-off-by: Martin K. Petersen <martin.petersen@...cle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/scsi/hosts.c     |    1 +
 include/scsi/scsi_host.h |    3 +++
 2 files changed, 4 insertions(+)

--- a/drivers/scsi/hosts.c
+++ b/drivers/scsi/hosts.c
@@ -474,6 +474,7 @@ struct Scsi_Host *scsi_host_alloc(struct
 		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);
--- a/include/scsi/scsi_host.h
+++ b/include/scsi/scsi_host.h
@@ -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.
 	 */