On 10/15/2016 10:47 AM, Christoph Hellwig wrote:
Just hand through the blk-mq map_queues method in the host template.
Signed-off-by: Christoph Hellwig <hch@xxxxxx>
---
block/blk-mq-cpumap.c | 1 +
drivers/scsi/scsi_lib.c | 10 ++++++++++
include/scsi/scsi_host.h | 8 ++++++++
3 files changed, 19 insertions(+)
diff --git a/block/blk-mq-cpumap.c b/block/blk-mq-cpumap.c
index 19b1d9c..8e61e86 100644
--- a/block/blk-mq-cpumap.c
+++ b/block/blk-mq-cpumap.c
@@ -87,6 +87,7 @@ int blk_mq_map_queues(struct blk_mq_tag_set *set)
free_cpumask_var(cpus);
return 0;
}
+EXPORT_SYMBOL_GPL(blk_mq_map_queues);
/*
* We have no quick way of doing reverse lookups. This is only used at
diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index 2cca9cf..f23ec24 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -1990,6 +1990,15 @@ static void scsi_exit_request(void *data, struct request *rq,
kfree(cmd->sense_buffer);
}
+static int scsi_map_queues(struct blk_mq_tag_set *set)
+{
+ struct Scsi_Host *shost = container_of(set, struct Scsi_Host, tag_set);
+
+ if (shost->hostt->map_queues)
+ return shost->hostt->map_queues(shost);
+ return blk_mq_map_queues(set);
+}
+
static u64 scsi_calculate_bounce_limit(struct Scsi_Host *shost)
{
struct device *host_dev;
@@ -2082,6 +2091,7 @@ static struct blk_mq_ops scsi_mq_ops = {
.timeout = scsi_timeout,
.init_request = scsi_init_request,
.exit_request = scsi_exit_request,
+ .map_queues = scsi_map_queues,
};
struct request_queue *scsi_mq_alloc_queue(struct scsi_device *sdev)
diff --git a/include/scsi/scsi_host.h b/include/scsi/scsi_host.h
index 7e4cd53..36680f1 100644
--- a/include/scsi/scsi_host.h
+++ b/include/scsi/scsi_host.h
@@ -278,6 +278,14 @@ struct scsi_host_template {
int (* change_queue_depth)(struct scsi_device *, int);
/*
+ * This functions lets the driver expose the queue mapping
+ * to the block layer.
+ *
+ * Status: OPTIONAL
+ */
+ int (* map_queues)(struct Scsi_Host *shost);
+
+ /*
* This function determines the BIOS parameters for a given
* harddisk. These tend to be numbers that are made up by
* the host adapter. Parameters:
Reviewed-by: Hannes Reinecke <hare@xxxxxxxx>
Cheers,
Hannes
--
Dr. Hannes Reinecke zSeries & Storage
hare@xxxxxxx +49 911 74053 688
SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 Nürnberg
GF: J. Hawn, J. Guild, F. Imendörffer, HRB 16746 (AG Nürnberg)
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