4.14-stable review patch. If anyone has any objections, please let me know.
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From: Ming Lei ming.lei@redhat.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@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: Ming Lei ming.lei@redhat.com Reviewed-by: Hannes Reinecke hare@suse.de Reviewed-by: Christoph Hellwig hch@lst.de Signed-off-by: Martin K. Petersen martin.petersen@oracle.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.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. */