From: drake@endlessm.com (Daniel Drake)
To: linux-arm-kernel@lists.infradead.org
Subject: dma_alloc_coherent versus streaming DMA, neither works satisfactory
Date: Thu, 7 May 2015 07:21:18 -0600 [thread overview]
Message-ID: <CAD8Lp45w6_ck13sG3PQ549AxsgTi96XQAkUEd9DQqt-i=ZXxUQ@mail.gmail.com> (raw)
In-Reply-To: <554B49F0.1090100@topic.nl>
On Thu, May 7, 2015 at 5:18 AM, Mike Looijmans <mike.looijmans@topic.nl> wrote:
> I reverted all my patches and workarounds. Indeed, the kernel needs a
> "coherent" version of the dma_mmap routine, as the current version will map
> it as non-cachable, resulting in a big performance hit (and nullifying the
> whole idea behind it).
>
> I'll test it further on my 'hardware' and cook up a patch that correctly
> maps the coherent pages.
Sorry that I have only read this thread briefly, but I wonder if this
is what you are looking for:
http://lists.infradead.org/pipermail/linux-arm-kernel/2015-February/325489.html
Thanks
Daniel
next prev parent reply other threads:[~2015-05-07 13:21 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-04-23 11:52 dma_alloc_coherent versus streaming DMA, neither works satisfactory Mike Looijmans
2015-04-23 12:32 ` Arnd Bergmann
2015-04-23 13:05 ` Mike Looijmans
2015-04-29 8:47 ` Mike Looijmans
2015-04-29 9:01 ` Arnd Bergmann
2015-04-29 9:17 ` Russell King - ARM Linux
2015-04-29 9:47 ` Mike Looijmans
2015-04-29 10:07 ` Arnd Bergmann
2015-04-29 10:33 ` Mike Looijmans
2015-04-29 10:41 ` Arnd Bergmann
2015-04-29 12:49 ` Mike Looijmans
2015-04-29 13:13 ` Arnd Bergmann
2015-04-30 13:50 ` Mike Looijmans
2015-04-30 13:54 ` Arnd Bergmann
2015-05-01 6:08 ` Mike Looijmans
2015-05-01 7:01 ` Mike Looijmans
2015-05-07 11:18 ` Mike Looijmans
2015-05-07 11:56 ` Arnd Bergmann
2015-05-07 13:21 ` Daniel Drake [this message]
2015-05-07 13:31 ` Mike Looijmans
2015-05-07 14:08 ` Mike Looijmans
2015-05-07 14:30 ` Russell King - ARM Linux
2015-05-08 5:55 ` Mike Looijmans
2015-05-08 7:54 ` Arnd Bergmann
2015-05-08 8:31 ` Mike Looijmans
2015-05-08 13:19 ` Arnd Bergmann
2015-05-08 14:18 ` Mike Looijmans
2015-05-08 14:27 ` Arnd Bergmann
2015-05-08 11:10 ` Russell King - ARM Linux
2015-05-08 12:17 ` Mike Looijmans
2015-04-29 11:09 ` Mike Looijmans
2015-04-29 12:35 ` Arnd Bergmann
2015-04-29 12:52 ` Mike Looijmans
2015-04-29 12:54 ` Arnd Bergmann
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