Re: [RFC/PATCH] mmc: block: use block layer pm helpers for pm of card device

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Hello Ulf, Chris,

Now as rc1 is out and the patch format fixed, please look into it again.

Thanks,
Kostya

On 04/21/2015 05:20 PM, Konstantin Dorfman wrote:
Use of block layer runtime PM helpers, implementing the block layer's
request-based mechanism, simplifies data path of mmc core layer. It
enables to remove synchronous call pm_runtime_get_sync() from mmc core
data path.

The idea and API is designed by Alan Stern and described here:
     http://marc.info/?l=linux-scsi&m=133727953625963&w=2

Signed-off-by: Konstantin Dorfman <kdorfman@xxxxxxxxxxxxxx>

diff --git a/drivers/mmc/card/block.c b/drivers/mmc/card/block.c
index 1fa4c80..de5f85d 100644
--- a/drivers/mmc/card/block.c
+++ b/drivers/mmc/card/block.c
@@ -2017,7 +2017,7 @@ static int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req)

  	if (req && !mq->mqrq_prev->req)
  		/* claim host only for the first request */
-		mmc_get_card(card);
+		mmc_claim_host(card->host);

  	ret = mmc_blk_part_switch(card, md);
  	if (ret) {
@@ -2060,7 +2060,7 @@ out:
  		 * In case sepecial request, there is no reentry to
  		 * the 'mmc_blk_issue_rq' with 'mqrq_prev->req'.
  		 */
-		mmc_put_card(card);
+		mmc_release_host(card->host);
  	return ret;
  }

diff --git a/drivers/mmc/card/queue.c b/drivers/mmc/card/queue.c
index feea926..e12c828 100644
--- a/drivers/mmc/card/queue.c
+++ b/drivers/mmc/card/queue.c
@@ -213,6 +213,11 @@ int mmc_init_queue(struct mmc_queue *mq, struct mmc_card *card,
  	if (mmc_can_erase(card))
  		mmc_queue_setup_discard(mq->queue, card);

+	if (!subname) {
+		blk_pm_runtime_init(mq->queue, &card->dev);
+		card->q = mq->queue;
+	}
+
  #ifdef CONFIG_MMC_BLOCK_BOUNCE
  	if (host->max_segs == 1) {
  		unsigned int bouncesz;
diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
index a301a78..bf3f919 100644
--- a/drivers/mmc/core/mmc.c
+++ b/drivers/mmc/core/mmc.c
@@ -14,6 +14,7 @@
  #include <linux/slab.h>
  #include <linux/stat.h>
  #include <linux/pm_runtime.h>
+#include <linux/blkdev.h>

  #include <linux/mmc/host.h>
  #include <linux/mmc/card.h>
@@ -1814,11 +1815,17 @@ static int mmc_runtime_suspend(struct mmc_host *host)
  	if (!(host->caps & MMC_CAP_AGGRESSIVE_PM))
  		return 0;

+	err = blk_pre_runtime_suspend(host->card->q);
+	if (err)
+		return err;
+
  	err = _mmc_suspend(host, true);
  	if (err)
  		pr_err("%s: error %d doing aggessive suspend\n",
  			mmc_hostname(host), err);

+	blk_post_runtime_suspend(host->card->q, err);
+
  	return err;
  }

@@ -1832,12 +1839,16 @@ static int mmc_runtime_resume(struct mmc_host *host)
  	if (!(host->caps & (MMC_CAP_AGGRESSIVE_PM | MMC_CAP_RUNTIME_RESUME)))
  		return 0;

+	blk_pre_runtime_resume(host->card->q);
+
  	err = _mmc_resume(host);
  	if (err)
  		pr_err("%s: error %d doing aggessive resume\n",
  			mmc_hostname(host), err);

-	return 0;
+	blk_post_runtime_resume(host->card->q, err);
+
+	return err;
  }

  static int mmc_power_restore(struct mmc_host *host)
diff --git a/include/linux/mmc/card.h b/include/linux/mmc/card.h
index b0692d2..1f4810b 100644
--- a/include/linux/mmc/card.h
+++ b/include/linux/mmc/card.h
@@ -244,6 +244,7 @@ struct mmc_part {
  struct mmc_card {
  	struct mmc_host		*host;		/* the host this device belongs to */
  	struct device		dev;		/* the device */
+	struct request_queue    *q;
  	u32			ocr;		/* the current OCR setting */
  	unsigned int		rca;		/* relative card address of device */
  	unsigned int		type;		/* card type */



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