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authorKashyap Desai <kashyap.desai@broadcom.com>2021-02-15 13:10:44 +0530
committerMartin K. Petersen <martin.petersen@oracle.com>2021-03-04 17:37:03 -0500
commitaf1830956dc3dca0c87b2d679f7c91a8fe0331e1 (patch)
treec8785a790eae473757002a5dddafe344a98cdbe9 /include/scsi
parent39ae3edda325e9cf9e978c9788affe88231f3b34 (diff)
downloadlinux-af1830956dc3dca0c87b2d679f7c91a8fe0331e1.tar.bz2
scsi: core: Add mq_poll support to SCSI layer
Currently IOPOLL support is only available in block layer. This patch adds mq_poll support to the SCSI layer. Link: https://lore.kernel.org/r/20210215074048.19424-2-kashyap.desai@broadcom.com Cc: sumit.saxena@broadcom.com Cc: chandrakanth.patil@broadcom.com Cc: linux-block@vger.kernel.org Reviewed-by: Hannes Reinecke <hare@suse.de> Reviewed-by: John Garry <john.garry@huawei.com> Signed-off-by: Kashyap Desai <kashyap.desai@broadcom.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'include/scsi')
-rw-r--r--include/scsi/scsi_cmnd.h1
-rw-r--r--include/scsi/scsi_host.h11
2 files changed, 12 insertions, 0 deletions
diff --git a/include/scsi/scsi_cmnd.h b/include/scsi/scsi_cmnd.h
index 0cf2b5ccc1f7..83f7e520be48 100644
--- a/include/scsi/scsi_cmnd.h
+++ b/include/scsi/scsi_cmnd.h
@@ -10,6 +10,7 @@
#include <linux/timer.h>
#include <linux/scatterlist.h>
#include <scsi/scsi_device.h>
+#include <scsi/scsi_host.h>
#include <scsi/scsi_request.h>
struct Scsi_Host;
diff --git a/include/scsi/scsi_host.h b/include/scsi/scsi_host.h
index f0e8a9e73002..d95c1502e17d 100644
--- a/include/scsi/scsi_host.h
+++ b/include/scsi/scsi_host.h
@@ -281,6 +281,16 @@ struct scsi_host_template {
int (* map_queues)(struct Scsi_Host *shost);
/*
+ * SCSI interface of blk_poll - poll for IO completions.
+ * Only applicable if SCSI LLD exposes multiple h/w queues.
+ *
+ * Return value: Number of completed entries found.
+ *
+ * Status: OPTIONAL
+ */
+ int (* mq_poll)(struct Scsi_Host *shost, unsigned int queue_num);
+
+ /*
* Check if scatterlists need to be padded for DMA draining.
*
* Status: OPTIONAL
@@ -622,6 +632,7 @@ struct Scsi_Host {
* the total queue depth is can_queue.
*/
unsigned nr_hw_queues;
+ unsigned nr_maps;
unsigned active_mode:2;
unsigned unchecked_isa_dma:1;