From: Andrei Warkentin <andreiw@motorola.com>
To: Shawn Guo <shawn.guo@linaro.org>
Cc: linux-mmc@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
linaro-kernel@lists.linaro.org, patches@linaro.org,
cjb@laptop.org, per.forlin@linaro.org
Subject: Re: [PATCH] mmc: sdhci: add support for pre_req and post_req
Date: Sat, 16 Apr 2011 18:06:00 -0500 [thread overview]
Message-ID: <BANLkTi=pqGyijbfuHD=uQzPnaYvNOQyzdg@mail.gmail.com> (raw)
In-Reply-To: <1302972516-8673-1-git-send-email-shawn.guo@linaro.org>
Hi Shawn,
On Sat, Apr 16, 2011 at 11:48 AM, Shawn Guo <shawn.guo@linaro.org> wrote:
> pre_req() runs dma_map_sg() post_req() runs dma_unmap_sg.
> If not calling pre_req() before sdhci_request(), request()
> will prepare the cache just like it did it before.
> It is optional to use pre_req() and post_req().
>
> Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
> ---
> I worked out the patch by referring to Per's patch below.
>
> omap_hsmmc: add support for pre_req and post_req
>
> It adds pre_req and post_req support for sdhci based host drivers to
> work with Per's non-blocking optimization. But I only have imx esdhc
> based hardware to test. Unfortunately, I can not measure the
> performance gain using mmc_test, because the current esdhc driver on
> mainline fails on the test. So I just did a quick test using 'dd',
> but sadly, I did not see noticeable performance gain here. The
> followings are possible reasons I can think of right away.
>
> * The patch did not add pre_req and post_req correctly. Please help
> review to catch the mistakes if any.
> * The imx esdhc driver uses SDHCI_SDMA (max_segs is 1) than SDHCI_ADAM
> (max_segs is 128), due to the broken ADMA support on imx esdhc. So
> can people holding other sdhci based hardware give a try on the
> patch?
>
> Hopefully, I can find some time to have a close look at the mmc_test
> failure and the broken ADMA with imx esdhc.
>
I'll try it out...
A
next prev parent reply other threads:[~2011-04-16 23:06 UTC|newest]
Thread overview: 58+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-04-06 19:07 [PATCH v2 00/12] mmc: use nonblock mmc requests to minimize latency Per Forlin
2011-04-06 19:07 ` [PATCH v2 01/12] mmc: add none blocking mmc request function Per Forlin
2011-04-15 10:34 ` David Vrabel
2011-04-20 7:17 ` Per Forlin
2011-04-26 13:29 ` David Vrabel
[not found] ` <4DB6C89F.10903-kQvG35nSl+M@public.gmane.org>
2011-04-26 14:22 ` Per Forlin
[not found] ` <1302116833-24540-1-git-send-email-per.forlin-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
2011-04-06 19:07 ` [PATCH v2 02/12] mmc: mmc_test: add debugfs file to list all tests Per Forlin
2011-04-06 19:07 ` [PATCH v2 03/12] mmc: mmc_test: add test for none blocking transfers Per Forlin
2011-04-17 7:09 ` Lin Tony-B19295
2011-04-20 7:30 ` Per Forlin
[not found] ` <1302116833-24540-4-git-send-email-per.forlin-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>
2011-04-17 15:46 ` Shawn Guo
2011-04-20 7:41 ` Per Forlin
2011-04-06 19:07 ` [PATCH v2 04/12] mmc: add member in mmc queue struct to hold request data Per Forlin
2011-04-06 19:07 ` [PATCH v2 05/12] mmc: add a block request prepare function Per Forlin
2011-04-06 19:07 ` [PATCH v2 06/12] mmc: move error code in mmc_block_issue_rw_rq to a separate function Per Forlin
2011-04-06 19:07 ` [PATCH v2 07/12] mmc: add a second mmc queue request member Per Forlin
2011-04-06 19:07 ` [PATCH v2 08/12] mmc: add handling for two parallel block requests in issue_rw_rq Per Forlin
2011-04-20 11:32 ` Per Forlin
2011-04-06 19:07 ` [PATCH v2 09/12] mmc: test: add random fault injection in core.c Per Forlin
2011-04-06 19:07 ` [PATCH v2 10/12] omap_hsmmc: use original sg_len for dma_unmap_sg Per Forlin
2011-04-06 19:07 ` [PATCH v2 11/12] omap_hsmmc: add support for pre_req and post_req Per Forlin
2011-04-06 19:07 ` [PATCH v2 12/12] mmci: implement pre_req() and post_req() Per Forlin
2011-04-08 16:49 ` [PATCH v2 00/12] mmc: use nonblock mmc requests to minimize latency Linus Walleij
2011-04-09 11:55 ` Jae hoon Chung
[not found] ` <BANLkTikVeXvfSBS-xLDXVdesKJpKdtUVqg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2011-04-10 3:33 ` anish singh
2011-04-11 9:03 ` Per Forlin
[not found] ` <BANLkTikoj6UTx08ntZaMM15taKRXjrU_Mg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2011-04-11 9:07 ` Sachin Nikam
2011-04-11 9:08 ` Per Forlin
2011-04-19 14:30 ` Jae hoon Chung
2011-04-16 15:48 ` Shawn Guo
2011-04-20 8:19 ` Per Forlin
2011-04-16 16:48 ` [PATCH] mmc: sdhci: add support for pre_req and post_req Shawn Guo
2011-04-16 23:06 ` Andrei Warkentin [this message]
2011-04-22 11:01 ` Jaehoon Chung
2011-04-27 0:59 ` Andrei Warkentin
2011-04-26 1:26 ` Jaehoon Chung
2011-04-26 2:47 ` Shawn Guo
2011-04-26 10:21 ` Per Forlin
2011-04-17 16:33 ` [PATCH] mmc: mxs-mmc: " Shawn Guo
2011-04-17 16:48 ` Shawn Guo
2011-04-20 8:01 ` Per Forlin
2011-04-20 14:01 ` Shawn Guo
2011-04-20 15:22 ` Per Forlin
2011-04-21 6:25 ` Shawn Guo
2011-04-21 8:52 ` Per Forlin
2011-04-20 15:30 ` Per Forlin
2011-04-21 6:29 ` Shawn Guo
2011-04-21 8:46 ` Per Forlin
2011-04-21 9:11 ` Shawn Guo
2011-04-21 9:47 ` Per Forlin
2011-04-21 10:15 ` Per Forlin
2011-04-28 7:52 ` Per Forlin
2011-04-28 10:10 ` Russell King - ARM Linux
2011-04-20 7:58 ` Per Forlin
2011-04-20 8:17 ` Shawn Guo
2011-04-20 13:51 ` [PATCH v2] " Shawn Guo
-- strict thread matches above, loose matches on Subject: below --
2013-09-06 6:01 [PATCH] mmc: sdhci: " Chanho Min
2013-09-06 8:05 ` Jaehoon Chung
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