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authorChristoph Hellwig <hch@lst.de>2016-09-14 16:18:55 +0200
committerJens Axboe <axboe@fb.com>2016-09-15 08:42:03 -0600
commitda695ba236b993f07a540d35c17f271ef08c89f3 (patch)
treebcf5c0624f3e3889b8c1284f1965cf90b265b78e /block/blk-mq.c
parent7d7e0f90b70f6c5367c2d1c9a7e87dd228bd0816 (diff)
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blk-mq: allow the driver to pass in a queue mapping
This allows drivers specify their own queue mapping by overriding the setup-time function that builds the mq_map. This can be used for example to build the map based on the MSI-X vector mapping provided by the core interrupt layer for PCI devices. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Keith Busch <keith.busch@intel.com> Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'block/blk-mq.c')
-rw-r--r--block/blk-mq.c18
1 files changed, 15 insertions, 3 deletions
diff --git a/block/blk-mq.c b/block/blk-mq.c
index 6e077a9d61a8..a3060078a8da 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -2286,6 +2286,8 @@ EXPORT_SYMBOL_GPL(blk_mq_tags_cpumask);
*/
int blk_mq_alloc_tag_set(struct blk_mq_tag_set *set)
{
+ int ret;
+
BUILD_BUG_ON(BLK_MQ_MAX_DEPTH > 1 << BLK_MQ_UNIQUE_TAG_BITS);
if (!set->nr_hw_queues)
@@ -2324,11 +2326,21 @@ int blk_mq_alloc_tag_set(struct blk_mq_tag_set *set)
if (!set->tags)
return -ENOMEM;
- set->mq_map = blk_mq_make_queue_map(set);
+ ret = -ENOMEM;
+ set->mq_map = kzalloc_node(sizeof(*set->mq_map) * nr_cpu_ids,
+ GFP_KERNEL, set->numa_node);
if (!set->mq_map)
goto out_free_tags;
- if (blk_mq_alloc_rq_maps(set))
+ if (set->ops->map_queues)
+ ret = set->ops->map_queues(set);
+ else
+ ret = blk_mq_map_queues(set);
+ if (ret)
+ goto out_free_mq_map;
+
+ ret = blk_mq_alloc_rq_maps(set);
+ if (ret)
goto out_free_mq_map;
mutex_init(&set->tag_list_lock);
@@ -2342,7 +2354,7 @@ out_free_mq_map:
out_free_tags:
kfree(set->tags);
set->tags = NULL;
- return -ENOMEM;
+ return ret;
}
EXPORT_SYMBOL(blk_mq_alloc_tag_set);