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-rw-r--r--block/blk-mq-cpumap.c27
1 files changed, 24 insertions, 3 deletions
diff --git a/block/blk-mq-cpumap.c b/block/blk-mq-cpumap.c
index 097921329619..1065d7c65fa1 100644
--- a/block/blk-mq-cpumap.c
+++ b/block/blk-mq-cpumap.c
@@ -1,3 +1,8 @@
+/*
+ * CPU <-> hardware queue mapping helpers
+ *
+ * Copyright (C) 2013-2014 Jens Axboe
+ */
#include <linux/kernel.h>
#include <linux/threads.h>
#include <linux/module.h>
@@ -80,19 +85,35 @@ int blk_mq_update_queue_map(unsigned int *map, unsigned int nr_queues)
return 0;
}
-unsigned int *blk_mq_make_queue_map(struct blk_mq_reg *reg)
+unsigned int *blk_mq_make_queue_map(struct blk_mq_tag_set *set)
{
unsigned int *map;
/* If cpus are offline, map them to first hctx */
map = kzalloc_node(sizeof(*map) * num_possible_cpus(), GFP_KERNEL,
- reg->numa_node);
+ set->numa_node);
if (!map)
return NULL;
- if (!blk_mq_update_queue_map(map, reg->nr_hw_queues))
+ if (!blk_mq_update_queue_map(map, set->nr_hw_queues))
return map;
kfree(map);
return NULL;
}
+
+/*
+ * We have no quick way of doing reverse lookups. This is only used at
+ * queue init time, so runtime isn't important.
+ */
+int blk_mq_hw_queue_to_node(unsigned int *mq_map, unsigned int index)
+{
+ int i;
+
+ for_each_possible_cpu(i) {
+ if (index == mq_map[i])
+ return cpu_to_node(i);
+ }
+
+ return NUMA_NO_NODE;
+}