Re: [RFC PATCH 0/5]mmc: Soft Command queue implementation for eMMC5.1 device

[Jaehoon Chung <jh80.chung@samsung.com>]

Hi, Chuanxiao.

Was it published for the eMMC5.1 spec?

Best Regards,
Jaehoon Chung

On 12/19/2014 05:04 PM, Chuanxiao Dong wrote:
> Hello,
> 
> Seems community already have some implementation for the eMMC5.1 device command
> queue feature, but that require the eMMC host controller to support CMDQ. In my
> platform, I don't have this kind of eMMC host controller but I have a
> Samsung eMMC5.1 device which can support the Command queue.
> 
> With this limitation, I have to let eMMC host controller to manually send the
> CMD44/45/13/46/47. So in this way, more commands are needed for an I/O request,
> more interrupts/schedule are needed in driver.
> 
> Even this way have some more software overhead, but it can still use the eMMC5.1
> device Command queue feature. After test with the iozone command:
> "iozone -zec -t 4 -i0 -i2 -F iozonefile1 iozonefile2 iozonefile3 iozonefile4 -+n
> -I -r 4k -s 500m -O -R -+r -+D" to test random performance, I saw a performance
> improvment for random read on my eMMC5.1 device:
> 
> 		Random read
> SW CMDQ:	5544.6
> Normal Read:	3993.05
> 
> So I want to send this serial patches as RFC patch for reviewing
> 
> 
> Chuanxiao Dong (5):
>   mmc: replace sbc to precmd and add postcmd
>   mmc: host: add runtime PM for host class dev
>   mmc: queue: change mqrq_cur and mqrq_pre to mq qdepth
>   mmc: core: add support for CMDQ feature in MMC Core stack
>   mmc: sdhci: add SW CMDQ support for CHT SDHCI host
> 
>  drivers/mmc/card/block.c      |  538 ++++++++++++++++++++++++++++++++++++++---
>  drivers/mmc/card/queue.c      |  213 ++++++++--------
>  drivers/mmc/card/queue.h      |   14 +-
>  drivers/mmc/core/core.c       |   78 +++++-
>  drivers/mmc/core/host.c       |   14 ++
>  drivers/mmc/core/mmc.c        |   43 +++-
>  drivers/mmc/host/dw_mmc.c     |    8 +-
>  drivers/mmc/host/mmci.c       |   14 +-
>  drivers/mmc/host/omap_hsmmc.c |   18 +-
>  drivers/mmc/host/sdhci-acpi.c |    1 -
>  drivers/mmc/host/sdhci-pci.c  |    1 -
>  drivers/mmc/host/sdhci.c      |  137 +++++++++--
>  include/linux/mmc/card.h      |    3 +
>  include/linux/mmc/core.h      |    5 +-
>  include/linux/mmc/host.h      |    5 +
>  include/linux/mmc/mmc.h       |   21 ++
>  include/linux/mmc/pm.h        |    1 +
>  include/linux/mmc/sdhci.h     |    1 +
>  18 files changed, 909 insertions(+), 206 deletions(-)
>