block: add block polling support

[cascardo/linux.git] / include / linux / blk-mq.h

diff --git a/include/linux/blk-mq.h b/include/linux/blk-mq.h
index 83cc9d4..daf17d7 100644 (file)
--- a/include/linux/blk-mq.h
+++ b/include/linux/blk-mq.h
@@ -59,6 +59,9 @@ struct blk_mq_hw_ctx {
 
        struct blk_mq_cpu_notifier      cpu_notifier;
        struct kobject          kobj;
+
+       unsigned long           poll_invoked;
+       unsigned long           poll_success;
 };
 
 struct blk_mq_tag_set {
@@ -97,6 +100,8 @@ typedef void (exit_request_fn)(void *, struct request *, unsigned int,
 typedef void (busy_iter_fn)(struct blk_mq_hw_ctx *, struct request *, void *,
                bool);
 typedef void (busy_tag_iter_fn)(struct request *, void *, bool);
+typedef int (poll_fn)(struct blk_mq_hw_ctx *, unsigned int);
+
 
 struct blk_mq_ops {
        /*
@@ -114,6 +119,11 @@ struct blk_mq_ops {
         */
        timeout_fn              *timeout;
 
+       /*
+        * Called to poll for completion of a specific tag.
+        */
+       poll_fn                 *poll;
+
        softirq_done_fn         *complete;
 
        /*