mmc: core: Add parameter use_blk_mq

ahunter6 · storulf · commit c3d53d0da69d · 2017-12-11T12:44:33.000+01:00
Until mmc has blk-mq support fully implemented and tested, add a parameter
use_blk_mq, set to true if config option MMC_MQ_DEFAULT is selected, which
it is by default.

Signed-off-by: Adrian Hunter &lt;adrian.hunter@intel.com&gt;
Acked-by: Linus Walleij &lt;linus.walleij@linaro.org&gt;
Signed-off-by: Ulf Hansson &lt;ulf.hansson@linaro.org&gt;
Tested-by: Linus Walleij &lt;linus.walleij@linaro.org&gt;
diff --git a/drivers/mmc/Kconfig b/drivers/mmc/Kconfig
@@ -12,6 +12,16 @@ menuconfig MMC
 	  If you want MMC/SD/SDIO support, you should say Y here and
 	  also to your specific host controller driver.
 
+config MMC_MQ_DEFAULT
+	bool "MMC: use blk-mq I/O path by default"
+	depends on MMC && BLOCK
+	default y
+	---help---
+	  This option enables the new blk-mq based I/O path for MMC block
+	  devices by default.  With the option the mmc_core.use_blk_mq
+	  module/boot option defaults to Y, without it to N, but it can
+	  still be overridden either way.
+
 if MMC
 
 source "drivers/mmc/core/Kconfig"
diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
@@ -66,6 +66,13 @@ static const unsigned freqs[] = { 400000, 300000, 200000, 100000 };
 bool use_spi_crc = 1;
 module_param(use_spi_crc, bool, 0);
 
+#ifdef CONFIG_MMC_MQ_DEFAULT
+bool mmc_use_blk_mq = true;
+#else
+bool mmc_use_blk_mq = false;
+#endif
+module_param_named(use_blk_mq, mmc_use_blk_mq, bool, S_IWUSR | S_IRUGO);
+
 static int mmc_schedule_delayed_work(struct delayed_work *work,
 				     unsigned long delay)
 {
diff --git a/drivers/mmc/core/core.h b/drivers/mmc/core/core.h
@@ -35,6 +35,8 @@ struct mmc_bus_ops {
 	int (*reset)(struct mmc_host *);
 };
 
+extern bool mmc_use_blk_mq;
+
 void mmc_attach_bus(struct mmc_host *host, const struct mmc_bus_ops *ops);
 void mmc_detach_bus(struct mmc_host *host);
 
diff --git a/drivers/mmc/core/host.c b/drivers/mmc/core/host.c
@@ -404,6 +404,8 @@ struct mmc_host *mmc_alloc_host(int extra, struct device *dev)
 
 	host->fixed_drv_type = -EINVAL;
 
+	host->use_blk_mq = mmc_use_blk_mq;
+
 	return host;
 }
 
diff --git a/drivers/mmc/core/host.h b/drivers/mmc/core/host.h
@@ -74,6 +74,10 @@ static inline bool mmc_card_hs400es(struct mmc_card *card)
 	return card->host->ios.enhanced_strobe;
 }
 
+static inline bool mmc_host_use_blk_mq(struct mmc_host *host)
+{
+	return host->use_blk_mq;
+}
 
 #endif
 
diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h
@@ -380,6 +380,7 @@ struct mmc_host {
 	unsigned int		doing_retune:1;	/* re-tuning in progress */
 	unsigned int		retune_now:1;	/* do re-tuning at next req */
 	unsigned int		retune_paused:1; /* re-tuning is temporarily disabled */
+	unsigned int		use_blk_mq:1;	/* use blk-mq */
 
 	int			rescan_disable;	/* disable card detection */
 	int			rescan_entered;	/* used with nonremovable devices */

Original file line number	Diff line number	Diff line change
`@@ -404,6 +404,8 @@ struct mmc_host mmc_alloc_host(int extra, struct device dev)`
`404`	`404`
`405`	`405`	`host->fixed_drv_type = -EINVAL;`
`406`	`406`
	`407`	`+ host->use_blk_mq = mmc_use_blk_mq;`
	`408`	`+`
`407`	`409`	`return host;`
`408`	`410`	`}`
`409`	`411`
Original file line number	Diff line number	Diff line change
`@@ -74,6 +74,10 @@ static inline bool mmc_card_hs400es(struct mmc_card *card)`
`74`	`74`	`return card->host->ios.enhanced_strobe;`
`75`	`75`	`}`
`76`	`76`
	`77`	`+static inline bool mmc_host_use_blk_mq(struct mmc_host *host)`
	`78`	`+{`
	`79`	`+ return host->use_blk_mq;`
	`80`	`+}`
`77`	`81`
`78`	`82`	`#endif`
`79`	`83`