block: implement runtime pm strategy

[karo-tx-linux.git] / block / blk-core.c

diff --git a/block/blk-core.c b/block/blk-core.c
index 123d240132bf68031961f96d287fdf090c2133d7..441f3488a766a8f1867b2622126bae9e1c8ab010 100644 (file)
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -1264,6 +1264,16 @@ void part_round_stats(int cpu, struct hd_struct *part)
 }
 EXPORT_SYMBOL_GPL(part_round_stats);
 
+#ifdef CONFIG_PM_RUNTIME
+static void blk_pm_put_request(struct request *rq)
+{
+       if (rq->q->dev && !(rq->cmd_flags & REQ_PM) && !--rq->q->nr_pending)
+               pm_runtime_mark_last_busy(rq->q->dev);
+}
+#else
+static inline void blk_pm_put_request(struct request *rq) {}
+#endif
+
 /*
  * queue lock must be held
  */
@@ -1274,6 +1284,8 @@ void __blk_put_request(struct request_queue *q, struct request *req)
        if (unlikely(--req->ref_count))
                return;
 
+       blk_pm_put_request(req);
+
        elv_completed_request(q, req);
 
        /* this is a bio leak */
@@ -2053,6 +2065,28 @@ static void blk_account_io_done(struct request *req)
        }
 }
 
+#ifdef CONFIG_PM_RUNTIME
+/*
+ * Don't process normal requests when queue is suspended
+ * or in the process of suspending/resuming
+ */
+static struct request *blk_pm_peek_request(struct request_queue *q,
+                                          struct request *rq)
+{
+       if (q->dev && (q->rpm_status == RPM_SUSPENDED ||
+           (q->rpm_status != RPM_ACTIVE && !(rq->cmd_flags & REQ_PM))))
+               return NULL;
+       else
+               return rq;
+}
+#else
+static inline struct request *blk_pm_peek_request(struct request_queue *q,
+                                                 struct request *rq)
+{
+       return rq;
+}
+#endif
+
 /**
  * blk_peek_request - peek at the top of a request queue
  * @q: request queue to peek at
@@ -2075,6 +2109,11 @@ struct request *blk_peek_request(struct request_queue *q)
        int ret;
 
        while ((rq = __elv_next_request(q)) != NULL) {
+
+               rq = blk_pm_peek_request(q, rq);
+               if (!rq)
+                       break;
+
                if (!(rq->cmd_flags & REQ_STARTED)) {
                        /*
                         * This is the first time the device driver