blk-mq: register device instead of disk

Enable devices without a gendisk instance to register itself with blk-mq
and expose the associated multi-queue sysfs entries.

Signed-off-by: Matias Bjørling <m@bjorling.me>
Signed-off-by: Jens Axboe <axboe@fb.com>

diff --git a/block/blk-mq-sysfs.c b/block/blk-mq-sysfs.c
index 3c385b1..01fb455 100644 (file)
--- a/block/blk-mq-sysfs.c
+++ b/block/blk-mq-sysfs.c
@@ -393,9 +393,8 @@ static int blk_mq_register_hctx(struct blk_mq_hw_ctx *hctx)
        return ret;
 }
 
-static void __blk_mq_unregister_disk(struct gendisk *disk)
+static void __blk_mq_unregister_dev(struct device *dev, struct request_queue *q)
 {
-       struct request_queue *q = disk->queue;
        struct blk_mq_hw_ctx *hctx;
        struct blk_mq_ctx *ctx;
        int i, j;
@@ -413,15 +412,15 @@ static void __blk_mq_unregister_disk(struct gendisk *disk)
        kobject_del(&q->mq_kobj);
        kobject_put(&q->mq_kobj);
 
-       kobject_put(&disk_to_dev(disk)->kobj);
+       kobject_put(&dev->kobj);
 
        q->mq_sysfs_init_done = false;
 }
 
-void blk_mq_unregister_disk(struct gendisk *disk)
+void blk_mq_unregister_dev(struct device *dev, struct request_queue *q)
 {
        blk_mq_disable_hotplug();
-       __blk_mq_unregister_disk(disk);
+       __blk_mq_unregister_dev(dev, q);
        blk_mq_enable_hotplug();
 }
 
@@ -443,10 +442,8 @@ static void blk_mq_sysfs_init(struct request_queue *q)
        }
 }
 
-int blk_mq_register_disk(struct gendisk *disk)
+int blk_mq_register_dev(struct device *dev, struct request_queue *q)
 {
-       struct device *dev = disk_to_dev(disk);
-       struct request_queue *q = disk->queue;
        struct blk_mq_hw_ctx *hctx;
        int ret, i;
 
@@ -467,7 +464,7 @@ int blk_mq_register_disk(struct gendisk *disk)
        }
 
        if (ret)
-               __blk_mq_unregister_disk(disk);
+               __blk_mq_unregister_dev(dev, q);
        else
                q->mq_sysfs_init_done = true;
 out:
@@ -475,7 +472,7 @@ out:
 
        return ret;
 }
-EXPORT_SYMBOL_GPL(blk_mq_register_disk);
+EXPORT_SYMBOL_GPL(blk_mq_register_dev);
 
 void blk_mq_sysfs_unregister(struct request_queue *q)
 {

diff --git a/block/blk-sysfs.c b/block/blk-sysfs.c
index f87a7e7..9cc8d7c 100644 (file)
--- a/block/blk-sysfs.c
+++ b/block/blk-sysfs.c
@@ -704,7 +704,7 @@ int blk_register_queue(struct gendisk *disk)
        kobject_uevent(&q->kobj, KOBJ_ADD);
 
        if (q->mq_ops)
-               blk_mq_register_disk(disk);
+               blk_mq_register_dev(dev, q);
 
        if (!q->request_fn)
                return 0;
@@ -729,7 +729,7 @@ void blk_unregister_queue(struct gendisk *disk)
                return;
 
        if (q->mq_ops)
-               blk_mq_unregister_disk(disk);
+               blk_mq_unregister_dev(disk_to_dev(disk), q);
 
        if (q->request_fn)
                elv_unregister_queue(q);

diff --git a/drivers/md/dm-rq.c b/drivers/md/dm-rq.c
index 1ca7463..ee48230 100644 (file)
--- a/drivers/md/dm-rq.c
+++ b/drivers/md/dm-rq.c
@@ -955,7 +955,7 @@ int dm_mq_init_request_queue(struct mapped_device *md, struct dm_table *t)
        dm_init_md_queue(md);
 
        /* backfill 'mq' sysfs registration normally done in blk_register_queue */
-       blk_mq_register_disk(md->disk);
+       blk_mq_register_dev(disk_to_dev(md->disk), q);
 
        return 0;
 

diff --git a/include/linux/blk-mq.h b/include/linux/blk-mq.h
index 2575779..fbcfdf3 100644 (file)
--- a/include/linux/blk-mq.h
+++ b/include/linux/blk-mq.h
@@ -175,8 +175,8 @@ enum {
 struct request_queue *blk_mq_init_queue(struct blk_mq_tag_set *);
 struct request_queue *blk_mq_init_allocated_queue(struct blk_mq_tag_set *set,
                                                  struct request_queue *q);
-int blk_mq_register_disk(struct gendisk *);
-void blk_mq_unregister_disk(struct gendisk *);
+int blk_mq_register_dev(struct device *, struct request_queue *);
+void blk_mq_unregister_dev(struct device *, struct request_queue *);
 
 int blk_mq_alloc_tag_set(struct blk_mq_tag_set *set);
 void blk_mq_free_tag_set(struct blk_mq_tag_set *set);