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Commit bd0ba63e authored by Dov Levenglick's avatar Dov Levenglick
Browse files

mmc: add support for scheduling mmcqd on idle CPU 



In order to boost mmc performance on various platforms,
add support for configuring whether set_wake_up_idle()
should be called on the mmc queue thread (mmcqd).
The decision will be set in each individual platform's
dts file.

CRs-Fixed: 787554
Change-Id: I3989d3f5b8228785e6d3bc49c7eb01ebf2fa2f38
Signed-off-by: default avatarDov Levenglick <dovl@codeaurora.org>
parent a21f193d

Documentation/devicetree/bindings/mmc/sdhci-msm.txt

+3 −0
Original line number Diff line number Diff line
@@ -119,6 +119,9 @@ In the following, <supply> can be vdd (flash core voltage) or vdd-io (I/O voltag 
	  big/little cluster CPU cores used for PM QoS voting. This is parsed only

	  for pm QoS request type of PM_QOS_REQ_AFFINE_CORES ("affine_cores").



	- qcom,wakeup-on-idle: if configured, the mmcqd thread will call

	  set_wake_up_idle(), thereby voting for it to be called on idle CPUs.



Example:



	aliases {

drivers/mmc/card/queue.c

+2 −0
Original line number Diff line number Diff line
@@ -60,6 +60,8 @@ static int mmc_queue_thread(void *d) 
	struct mmc_card *card = mq->card;



	current->flags |= PF_MEMALLOC;

	if (card->host->wakeup_on_idle)

		set_wake_up_idle(true);



	down(&mq->thread_sem);

	do {

drivers/mmc/host/sdhci-msm.c

+8 −2
Original line number Diff line number Diff line
@@ -1550,7 +1550,9 @@ static void sdhci_msm_populate_affinity(struct device *dev, 
#endif



/* Parse platform data */

static struct sdhci_msm_pltfm_data *sdhci_msm_populate_pdata(struct device *dev)

static

struct sdhci_msm_pltfm_data *sdhci_msm_populate_pdata(struct device *dev,

						struct sdhci_msm_host *msm_host)

{

	struct sdhci_msm_pltfm_data *pdata = NULL;

	struct device_node *np = dev->of_node;
@@ -1708,6 +1710,9 @@ static struct sdhci_msm_pltfm_data *sdhci_msm_populate_pdata(struct device *dev) 


	sdhci_msm_populate_affinity(dev, pdata, np);



	if (of_property_read_bool(np, "qcom,wakeup-on-idle"))

		msm_host->mmc->wakeup_on_idle = true;



	return pdata;

out:

	return NULL;
@@ -3168,7 +3173,8 @@ static int sdhci_msm_probe(struct platform_device *pdev) 
			goto pltfm_free;

		}



		msm_host->pdata = sdhci_msm_populate_pdata(&pdev->dev);

		msm_host->pdata = sdhci_msm_populate_pdata(&pdev->dev,

							   msm_host);

		if (!msm_host->pdata) {

			dev_err(&pdev->dev, "DT parsing error\n");

			goto pltfm_free;

include/linux/mmc/host.h

+1 −0
Original line number Diff line number Diff line
@@ -458,6 +458,7 @@ struct mmc_host { 
	 * actually disabling the clock from it's source.

	 */

	bool			card_clock_off;

	bool			wakeup_on_idle;

	unsigned long		private[0] ____cacheline_aligned;

};