show max io queue depth, it may doesn't reflect the real hardware's
max queue depth which was reduced by some software designs.

Signed-off-by: weiping zhang <zhangweip...@didichuxing.com>
---
 block/blk-sysfs.c      | 11 +++++++++++
 include/linux/blkdev.h |  5 +++++
 2 files changed, 16 insertions(+)

diff --git a/block/blk-sysfs.c b/block/blk-sysfs.c
index 27aceab..66cba2b 100644
--- a/block/blk-sysfs.c
+++ b/block/blk-sysfs.c
@@ -256,6 +256,11 @@ static ssize_t queue_max_hw_sectors_show(struct 
request_queue *q, char *page)
        return queue_var_show(max_hw_sectors_kb, (page));
 }
 
+static ssize_t queue_io_queue_depth_show(struct request_queue *q, char *page)
+{
+       return queue_var_show(queue_io_queue_depth(q), (page));
+}
+
 #define QUEUE_SYSFS_BIT_FNS(name, flag, neg)                           \
 static ssize_t                                                         \
 queue_show_##name(struct request_queue *q, char *page)                 \
@@ -678,6 +683,11 @@ static struct queue_sysfs_entry queue_wb_lat_entry = {
        .store = queue_wb_lat_store,
 };
 
+static struct queue_sysfs_entry queue_io_queue_depth_entry = {
+       .attr = {.name = "io_queue_depth", .mode = S_IRUGO },
+       .show = queue_io_queue_depth_show,
+};
+
 #ifdef CONFIG_BLK_DEV_THROTTLING_LOW
 static struct queue_sysfs_entry throtl_sample_time_entry = {
        .attr = {.name = "throttle_sample_time", .mode = S_IRUGO | S_IWUSR },
@@ -719,6 +729,7 @@ static struct attribute *default_attrs[] = {
        &queue_dax_entry.attr,
        &queue_wb_lat_entry.attr,
        &queue_poll_delay_entry.attr,
+       &queue_io_queue_depth_entry.attr,
 #ifdef CONFIG_BLK_DEV_THROTTLING_LOW
        &throtl_sample_time_entry.attr,
 #endif
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 25f6a0c..bcd0af4 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -1405,6 +1405,11 @@ static inline unsigned int queue_max_hw_sectors(struct 
request_queue *q)
        return q->limits.max_hw_sectors;
 }
 
+static inline unsigned int queue_io_queue_depth(struct request_queue *q)
+{
+       return q->queue_depth;
+}
+
 static inline unsigned short queue_max_segments(struct request_queue *q)
 {
        return q->limits.max_segments;
-- 
2.9.4

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