[1/6,v2] mmc: core: Delete bounce buffer Kconfig option

Message ID 20170518092936.9277-1-linus.walleij@linaro.org
State New
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  • [1/6,v2] mmc: core: Delete bounce buffer Kconfig option
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Commit Message

Linus Walleij May 18, 2017, 9:29 a.m.
This option is activated by all multiplatform configs and what
not so we almost always have it turned on, and the memory it
saves is negligible, even more so moving forward. The actual
bounce buffer only gets allocated only when used, the only
thing the ifdefs are saving is a little bit of code.

It is highly improper to have this as a Kconfig option that
get turned on by Kconfig, make this a pure runtime-thing and
let the host decide whether we use bounce buffers. We add a
new property "disable_bounce" to the host struct.

Notice that mmc_queue_calc_bouncesz() already disables the
bounce buffers if host->max_segs != 1, so any arch that has a
maximum number of segments higher than 1 will have bounce
buffers disabled.

The option CONFIG_MMC_BLOCK_BOUNCE is default y so the
majority of platforms in the kernel already have it on, and
it then gets turned off at runtime since most of these have
a host->max_segs > 1. The few exceptions that have
host->max_segs == 1 and still turn off the bounce buffering
are those that disable it in their defconfig.

Those are the following:

arch/arm/configs/colibri_pxa300_defconfig
arch/arm/configs/zeus_defconfig
- Uses MMC_PXA, drivers/mmc/host/pxamci.c
- Sets host->max_segs = NR_SG, which is 1
- This needs its bounce buffer deactivated so we set
  host->disable_bounce to true in the host driver

arch/arm/configs/davinci_all_defconfig
- Uses MMC_DAVINCI, drivers/mmc/host/davinci_mmc.c
- This driver sets host->max_segs to MAX_NR_SG, which is 16
- That means this driver anyways disabled bounce buffers
- No special action needed for this platform

arch/arm/configs/lpc32xx_defconfig
arch/arm/configs/nhk8815_defconfig
arch/arm/configs/u300_defconfig
- Uses MMC_ARMMMCI, drivers/mmc/host/mmci.[c|h]
- This driver by default sets host->max_segs to NR_SG,
  which is 128, unless a DMA engine is used, and in that case
  the number of segments are also > 1
- That means this driver already disables bounce buffers
- No special action needed for these platforms

arch/arm/configs/sama5_defconfig
- Uses MMC_SDHCI, MMC_SDHCI_PLTFM, MMC_SDHCI_OF_AT91, MMC_ATMELMCI
- Uses drivers/mmc/host/sdhci.c
- Normally sets host->max_segs to SDHCI_MAX_SEGS which is 128 and
  thus disables bounce buffers
- Sets host->max_segs to 1 if SDHCI_USE_SDMA is set
- SDHCI_USE_SDMA is only set by SDHCI on PCI adapers
- That means that for this platform bounce buffers are already
  disabled at runtime
- No special action needed for this platform

arch/blackfin/configs/CM-BF533_defconfig
arch/blackfin/configs/CM-BF537E_defconfig
- Uses MMC_SPI (a simple MMC card connected on SPI pins)
- Uses drivers/mmc/host/mmc_spi.c
- Sets host->max_segs to MMC_SPI_BLOCKSATONCE which is 128
- That means this platform already disables bounce buffers at
  runtime
- No special action needed for these platforms

arch/mips/configs/cavium_octeon_defconfig
- Uses MMC_CAVIUM_OCTEON, drivers/mmc/host/cavium.c
- Sets host->max_segs to 16 or 1
- Setting host->disable_bounce to be sure for the 1 case

arch/mips/configs/qi_lb60_defconfig
- Uses MMC_JZ4740, drivers/mmc/host/jz4740_mmc.c
- This sets host->max_segs to 128 so bounce buffers are
  already runtime disabled
- No action needed for this platform

It would be interesting to come up with a list of the platforms
that actually end up using bounce buffers. I have not been
able to infer such a list, but it occurs when
host->max_segs == 1 and the bounce buffering is not explicitly
disabled.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

---
ChangeLog v1->v2:
- Instead of adding a new bool "disable_bounce" we use the host
  caps variable, reuse the free bit 21 to indicate that bounce
  buffers should be disabled on the host.
---
 drivers/mmc/core/Kconfig  | 18 ------------------
 drivers/mmc/core/queue.c  | 15 +--------------
 drivers/mmc/host/cavium.c |  4 +++-
 drivers/mmc/host/pxamci.c |  6 +++++-
 include/linux/mmc/host.h  |  1 +
 5 files changed, 10 insertions(+), 34 deletions(-)

-- 
2.9.3

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Comments

Ulf Hansson May 19, 2017, 8:30 a.m. | #1
On 18 May 2017 at 11:29, Linus Walleij <linus.walleij@linaro.org> wrote:
> This option is activated by all multiplatform configs and what

> not so we almost always have it turned on, and the memory it

> saves is negligible, even more so moving forward. The actual

> bounce buffer only gets allocated only when used, the only

> thing the ifdefs are saving is a little bit of code.

>

> It is highly improper to have this as a Kconfig option that

> get turned on by Kconfig, make this a pure runtime-thing and

> let the host decide whether we use bounce buffers. We add a

> new property "disable_bounce" to the host struct.

>

> Notice that mmc_queue_calc_bouncesz() already disables the

> bounce buffers if host->max_segs != 1, so any arch that has a

> maximum number of segments higher than 1 will have bounce

> buffers disabled.

>

> The option CONFIG_MMC_BLOCK_BOUNCE is default y so the

> majority of platforms in the kernel already have it on, and

> it then gets turned off at runtime since most of these have

> a host->max_segs > 1. The few exceptions that have

> host->max_segs == 1 and still turn off the bounce buffering

> are those that disable it in their defconfig.

>

> Those are the following:

>

> arch/arm/configs/colibri_pxa300_defconfig

> arch/arm/configs/zeus_defconfig

> - Uses MMC_PXA, drivers/mmc/host/pxamci.c

> - Sets host->max_segs = NR_SG, which is 1

> - This needs its bounce buffer deactivated so we set

>   host->disable_bounce to true in the host driver

>

> arch/arm/configs/davinci_all_defconfig

> - Uses MMC_DAVINCI, drivers/mmc/host/davinci_mmc.c

> - This driver sets host->max_segs to MAX_NR_SG, which is 16

> - That means this driver anyways disabled bounce buffers

> - No special action needed for this platform

>

> arch/arm/configs/lpc32xx_defconfig

> arch/arm/configs/nhk8815_defconfig

> arch/arm/configs/u300_defconfig

> - Uses MMC_ARMMMCI, drivers/mmc/host/mmci.[c|h]

> - This driver by default sets host->max_segs to NR_SG,

>   which is 128, unless a DMA engine is used, and in that case

>   the number of segments are also > 1

> - That means this driver already disables bounce buffers

> - No special action needed for these platforms

>

> arch/arm/configs/sama5_defconfig

> - Uses MMC_SDHCI, MMC_SDHCI_PLTFM, MMC_SDHCI_OF_AT91, MMC_ATMELMCI

> - Uses drivers/mmc/host/sdhci.c

> - Normally sets host->max_segs to SDHCI_MAX_SEGS which is 128 and

>   thus disables bounce buffers

> - Sets host->max_segs to 1 if SDHCI_USE_SDMA is set

> - SDHCI_USE_SDMA is only set by SDHCI on PCI adapers

> - That means that for this platform bounce buffers are already

>   disabled at runtime

> - No special action needed for this platform

>

> arch/blackfin/configs/CM-BF533_defconfig

> arch/blackfin/configs/CM-BF537E_defconfig

> - Uses MMC_SPI (a simple MMC card connected on SPI pins)

> - Uses drivers/mmc/host/mmc_spi.c

> - Sets host->max_segs to MMC_SPI_BLOCKSATONCE which is 128

> - That means this platform already disables bounce buffers at

>   runtime

> - No special action needed for these platforms

>

> arch/mips/configs/cavium_octeon_defconfig

> - Uses MMC_CAVIUM_OCTEON, drivers/mmc/host/cavium.c

> - Sets host->max_segs to 16 or 1

> - Setting host->disable_bounce to be sure for the 1 case

>

> arch/mips/configs/qi_lb60_defconfig

> - Uses MMC_JZ4740, drivers/mmc/host/jz4740_mmc.c

> - This sets host->max_segs to 128 so bounce buffers are

>   already runtime disabled

> - No action needed for this platform

>

> It would be interesting to come up with a list of the platforms

> that actually end up using bounce buffers. I have not been

> able to infer such a list, but it occurs when

> host->max_segs == 1 and the bounce buffering is not explicitly

> disabled.

>

> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>


Thanks, the *series* applied for next! (Responding to patch1 as
couldn't find the cover-letter for v2).

Kind regards
Uffe

> ---

> ChangeLog v1->v2:

> - Instead of adding a new bool "disable_bounce" we use the host

>   caps variable, reuse the free bit 21 to indicate that bounce

>   buffers should be disabled on the host.

> ---

>  drivers/mmc/core/Kconfig  | 18 ------------------

>  drivers/mmc/core/queue.c  | 15 +--------------

>  drivers/mmc/host/cavium.c |  4 +++-

>  drivers/mmc/host/pxamci.c |  6 +++++-

>  include/linux/mmc/host.h  |  1 +

>  5 files changed, 10 insertions(+), 34 deletions(-)

>

> diff --git a/drivers/mmc/core/Kconfig b/drivers/mmc/core/Kconfig

> index fc1ecdaaa9ca..42e89060cd41 100644

> --- a/drivers/mmc/core/Kconfig

> +++ b/drivers/mmc/core/Kconfig

> @@ -61,24 +61,6 @@ config MMC_BLOCK_MINORS

>

>           If unsure, say 8 here.

>

> -config MMC_BLOCK_BOUNCE

> -       bool "Use bounce buffer for simple hosts"

> -       depends on MMC_BLOCK

> -       default y

> -       help

> -         SD/MMC is a high latency protocol where it is crucial to

> -         send large requests in order to get high performance. Many

> -         controllers, however, are restricted to continuous memory

> -         (i.e. they can't do scatter-gather), something the kernel

> -         rarely can provide.

> -

> -         Say Y here to help these restricted hosts by bouncing

> -         requests back and forth from a large buffer. You will get

> -         a big performance gain at the cost of up to 64 KiB of

> -         physical memory.

> -

> -         If unsure, say Y here.

> -

>  config SDIO_UART

>         tristate "SDIO UART/GPS class support"

>         depends on TTY

> diff --git a/drivers/mmc/core/queue.c b/drivers/mmc/core/queue.c

> index 5c37b6be3e7b..70ba7f94c706 100644

> --- a/drivers/mmc/core/queue.c

> +++ b/drivers/mmc/core/queue.c

> @@ -219,7 +219,6 @@ static struct mmc_queue_req *mmc_queue_alloc_mqrqs(int qdepth)

>         return mqrq;

>  }

>

> -#ifdef CONFIG_MMC_BLOCK_BOUNCE

>  static int mmc_queue_alloc_bounce_bufs(struct mmc_queue_req *mqrq, int qdepth,

>                                        unsigned int bouncesz)

>  {

> @@ -258,7 +257,7 @@ static unsigned int mmc_queue_calc_bouncesz(struct mmc_host *host)

>  {

>         unsigned int bouncesz = MMC_QUEUE_BOUNCESZ;

>

> -       if (host->max_segs != 1)

> +       if (host->max_segs != 1 || (host->caps & MMC_CAP_NO_BOUNCE_BUFF))

>                 return 0;

>

>         if (bouncesz > host->max_req_size)

> @@ -273,18 +272,6 @@ static unsigned int mmc_queue_calc_bouncesz(struct mmc_host *host)

>

>         return bouncesz;

>  }

> -#else

> -static inline bool mmc_queue_alloc_bounce(struct mmc_queue_req *mqrq,

> -                                         int qdepth, unsigned int bouncesz)

> -{

> -       return false;

> -}

> -

> -static unsigned int mmc_queue_calc_bouncesz(struct mmc_host *host)

> -{

> -       return 0;

> -}

> -#endif

>

>  static int mmc_queue_alloc_sgs(struct mmc_queue_req *mqrq, int qdepth,

>                                int max_segs)

> diff --git a/drivers/mmc/host/cavium.c b/drivers/mmc/host/cavium.c

> index 58b51ba6aabd..9c1575f7c1fb 100644

> --- a/drivers/mmc/host/cavium.c

> +++ b/drivers/mmc/host/cavium.c

> @@ -1040,10 +1040,12 @@ int cvm_mmc_of_slot_probe(struct device *dev, struct cvm_mmc_host *host)

>          * We only have a 3.3v supply, we cannot support any

>          * of the UHS modes. We do support the high speed DDR

>          * modes up to 52MHz.

> +        *

> +        * Disable bounce buffers for max_segs = 1

>          */

>         mmc->caps |= MMC_CAP_MMC_HIGHSPEED | MMC_CAP_SD_HIGHSPEED |

>                      MMC_CAP_ERASE | MMC_CAP_CMD23 | MMC_CAP_POWER_OFF_CARD |

> -                    MMC_CAP_3_3V_DDR;

> +                    MMC_CAP_3_3V_DDR | MMC_CAP_NO_BOUNCE_BUFF;

>

>         if (host->use_sg)

>                 mmc->max_segs = 16;

> diff --git a/drivers/mmc/host/pxamci.c b/drivers/mmc/host/pxamci.c

> index c763b404510f..59ab194cb009 100644

> --- a/drivers/mmc/host/pxamci.c

> +++ b/drivers/mmc/host/pxamci.c

> @@ -702,7 +702,11 @@ static int pxamci_probe(struct platform_device *pdev)

>

>         pxamci_init_ocr(host);

>

> -       mmc->caps = 0;

> +       /*

> +        * This architecture used to disable bounce buffers through its

> +        * defconfig, now it is done at runtime as a host property.

> +        */

> +       mmc->caps = MMC_CAP_NO_BOUNCE_BUFF;

>         host->cmdat = 0;

>         if (!cpu_is_pxa25x()) {

>                 mmc->caps |= MMC_CAP_4_BIT_DATA | MMC_CAP_SDIO_IRQ;

> diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h

> index 21385ac0c9b1..67f6abe5c3af 100644

> --- a/include/linux/mmc/host.h

> +++ b/include/linux/mmc/host.h

> @@ -270,6 +270,7 @@ struct mmc_host {

>  #define MMC_CAP_UHS_SDR50      (1 << 18)       /* Host supports UHS SDR50 mode */

>  #define MMC_CAP_UHS_SDR104     (1 << 19)       /* Host supports UHS SDR104 mode */

>  #define MMC_CAP_UHS_DDR50      (1 << 20)       /* Host supports UHS DDR50 mode */

> +#define MMC_CAP_NO_BOUNCE_BUFF (1 << 21)       /* Disable bounce buffers on host */

>  #define MMC_CAP_DRIVER_TYPE_A  (1 << 23)       /* Host supports Driver Type A */

>  #define MMC_CAP_DRIVER_TYPE_C  (1 << 24)       /* Host supports Driver Type C */

>  #define MMC_CAP_DRIVER_TYPE_D  (1 << 25)       /* Host supports Driver Type D */

> --

> 2.9.3

>

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Linus Walleij May 19, 2017, 1:56 p.m. | #2
On Fri, May 19, 2017 at 10:30 AM, Ulf Hansson <ulf.hansson@linaro.org> wrote:

> Thanks, the *series* applied for next! (Responding to patch1 as

> couldn't find the cover-letter for v2).


Awesome, and just to make sure you will not be bored in the weekend
I just sent a sequel series expanding the use of per-request datas
to move more host locking and congestion out of the way.

Yours,
Linus Walleij
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Patch hide | download patch | download mbox

diff --git a/drivers/mmc/core/Kconfig b/drivers/mmc/core/Kconfig
index fc1ecdaaa9ca..42e89060cd41 100644
--- a/drivers/mmc/core/Kconfig
+++ b/drivers/mmc/core/Kconfig
@@ -61,24 +61,6 @@  config MMC_BLOCK_MINORS
 
 	  If unsure, say 8 here.
 
-config MMC_BLOCK_BOUNCE
-	bool "Use bounce buffer for simple hosts"
-	depends on MMC_BLOCK
-	default y
-	help
-	  SD/MMC is a high latency protocol where it is crucial to
-	  send large requests in order to get high performance. Many
-	  controllers, however, are restricted to continuous memory
-	  (i.e. they can't do scatter-gather), something the kernel
-	  rarely can provide.
-
-	  Say Y here to help these restricted hosts by bouncing
-	  requests back and forth from a large buffer. You will get
-	  a big performance gain at the cost of up to 64 KiB of
-	  physical memory.
-
-	  If unsure, say Y here.
-
 config SDIO_UART
 	tristate "SDIO UART/GPS class support"
 	depends on TTY
diff --git a/drivers/mmc/core/queue.c b/drivers/mmc/core/queue.c
index 5c37b6be3e7b..70ba7f94c706 100644
--- a/drivers/mmc/core/queue.c
+++ b/drivers/mmc/core/queue.c
@@ -219,7 +219,6 @@  static struct mmc_queue_req *mmc_queue_alloc_mqrqs(int qdepth)
 	return mqrq;
 }
 
-#ifdef CONFIG_MMC_BLOCK_BOUNCE
 static int mmc_queue_alloc_bounce_bufs(struct mmc_queue_req *mqrq, int qdepth,
 				       unsigned int bouncesz)
 {
@@ -258,7 +257,7 @@  static unsigned int mmc_queue_calc_bouncesz(struct mmc_host *host)
 {
 	unsigned int bouncesz = MMC_QUEUE_BOUNCESZ;
 
-	if (host->max_segs != 1)
+	if (host->max_segs != 1 || (host->caps & MMC_CAP_NO_BOUNCE_BUFF))
 		return 0;
 
 	if (bouncesz > host->max_req_size)
@@ -273,18 +272,6 @@  static unsigned int mmc_queue_calc_bouncesz(struct mmc_host *host)
 
 	return bouncesz;
 }
-#else
-static inline bool mmc_queue_alloc_bounce(struct mmc_queue_req *mqrq,
-					  int qdepth, unsigned int bouncesz)
-{
-	return false;
-}
-
-static unsigned int mmc_queue_calc_bouncesz(struct mmc_host *host)
-{
-	return 0;
-}
-#endif
 
 static int mmc_queue_alloc_sgs(struct mmc_queue_req *mqrq, int qdepth,
 			       int max_segs)
diff --git a/drivers/mmc/host/cavium.c b/drivers/mmc/host/cavium.c
index 58b51ba6aabd..9c1575f7c1fb 100644
--- a/drivers/mmc/host/cavium.c
+++ b/drivers/mmc/host/cavium.c
@@ -1040,10 +1040,12 @@  int cvm_mmc_of_slot_probe(struct device *dev, struct cvm_mmc_host *host)
 	 * We only have a 3.3v supply, we cannot support any
 	 * of the UHS modes. We do support the high speed DDR
 	 * modes up to 52MHz.
+	 *
+	 * Disable bounce buffers for max_segs = 1
 	 */
 	mmc->caps |= MMC_CAP_MMC_HIGHSPEED | MMC_CAP_SD_HIGHSPEED |
 		     MMC_CAP_ERASE | MMC_CAP_CMD23 | MMC_CAP_POWER_OFF_CARD |
-		     MMC_CAP_3_3V_DDR;
+		     MMC_CAP_3_3V_DDR | MMC_CAP_NO_BOUNCE_BUFF;
 
 	if (host->use_sg)
 		mmc->max_segs = 16;
diff --git a/drivers/mmc/host/pxamci.c b/drivers/mmc/host/pxamci.c
index c763b404510f..59ab194cb009 100644
--- a/drivers/mmc/host/pxamci.c
+++ b/drivers/mmc/host/pxamci.c
@@ -702,7 +702,11 @@  static int pxamci_probe(struct platform_device *pdev)
 
 	pxamci_init_ocr(host);
 
-	mmc->caps = 0;
+	/*
+	 * This architecture used to disable bounce buffers through its
+	 * defconfig, now it is done at runtime as a host property.
+	 */
+	mmc->caps = MMC_CAP_NO_BOUNCE_BUFF;
 	host->cmdat = 0;
 	if (!cpu_is_pxa25x()) {
 		mmc->caps |= MMC_CAP_4_BIT_DATA | MMC_CAP_SDIO_IRQ;
diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h
index 21385ac0c9b1..67f6abe5c3af 100644
--- a/include/linux/mmc/host.h
+++ b/include/linux/mmc/host.h
@@ -270,6 +270,7 @@  struct mmc_host {
 #define MMC_CAP_UHS_SDR50	(1 << 18)	/* Host supports UHS SDR50 mode */
 #define MMC_CAP_UHS_SDR104	(1 << 19)	/* Host supports UHS SDR104 mode */
 #define MMC_CAP_UHS_DDR50	(1 << 20)	/* Host supports UHS DDR50 mode */
+#define MMC_CAP_NO_BOUNCE_BUFF	(1 << 21)	/* Disable bounce buffers on host */
 #define MMC_CAP_DRIVER_TYPE_A	(1 << 23)	/* Host supports Driver Type A */
 #define MMC_CAP_DRIVER_TYPE_C	(1 << 24)	/* Host supports Driver Type C */
 #define MMC_CAP_DRIVER_TYPE_D	(1 << 25)	/* Host supports Driver Type D */