From: Christoph Hellwig <hch@lst.de>
To: Paul Cercueil <paul@crapouillou.net>
Cc: Christoph Hellwig <hch@lst.de>,
Stephen Rothwell <sfr@canb.auug.org.au>,
Dave Airlie <airlied@linux.ie>,
DRI <dri-devel@lists.freedesktop.org>,
Linux Next Mailing List <linux-next@vger.kernel.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: linux-next: build failure after merge of the drm tree
Date: Wed, 30 Sep 2020 18:40:23 +0200 [thread overview]
Message-ID: <20200930164023.GA8645@lst.de> (raw)
In-Reply-To: <IXCHHQ.XHZEBJ42HOEJ1@crapouillou.net>
On Wed, Sep 30, 2020 at 06:39:18PM +0200, Paul Cercueil wrote:
>> dma_alloc_pages gives you cached memory, so you can't just use an
>> uncached protection for the userspace mmap here. If you want uncached
>> memory you need to use dma_alloc_coherent paired with dma_mmap_coherent.
>> Or dma_alloc_wc for a slightly different flavor of uncached. (both
>> of the map to dma_alloc_attrs / dma_mmap_attrs eventually).
>
> I don't want uncached memory, I want non-coherent cached memory.
We don't have such a thing in the Linux API at all.
next prev parent reply other threads:[~2020-09-30 16:40 UTC|newest]
Thread overview: 149+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-28 3:54 linux-next: build failure after merge of the drm tree Stephen Rothwell
2020-09-28 6:04 ` Christoph Hellwig
2020-09-28 6:08 ` Dave Airlie
2020-09-28 6:14 ` Christoph Hellwig
2020-09-28 10:15 ` Paul Cercueil
2020-09-28 11:34 ` Christoph Hellwig
2020-09-28 11:46 ` Paul Cercueil
2020-09-28 12:10 ` Christoph Hellwig
2020-09-28 13:31 ` Paul Cercueil
2020-09-30 9:02 ` Christoph Hellwig
2020-09-30 13:33 ` Paul Cercueil
2020-09-30 16:11 ` Christoph Hellwig
2020-09-30 16:39 ` Paul Cercueil
2020-09-30 16:40 ` Christoph Hellwig [this message]
2020-09-30 16:45 ` Paul Cercueil
2020-09-30 16:52 ` Christoph Hellwig
2020-09-30 17:16 ` [PATCH 1/3] drm: Add and export function drm_gem_cma_create_noalloc Paul Cercueil
2020-10-01 8:51 ` Daniel Vetter
2020-09-30 17:16 ` [PATCH 2/3] drm/ingenic: Update code to mmap GEM buffers cached Paul Cercueil
2020-10-01 5:32 ` Christoph Hellwig
2020-09-30 17:16 ` [PATCH 3/3] drm/ingenic: Alloc cached GEM buffers with dma_alloc_noncoherent Paul Cercueil
2020-10-01 5:35 ` Christoph Hellwig
2020-10-04 14:17 ` [PATCH] Revert "gpu/drm: ingenic: Add option to mmap GEM buffers cached" Paul Cercueil
2020-10-04 19:59 ` Sam Ravnborg
2020-10-04 20:11 ` Paul Cercueil
2020-10-05 12:01 ` Stephen Rothwell
2020-10-05 14:05 ` Daniel Vetter
2020-10-05 14:47 ` Paul Cercueil
2020-10-05 17:38 ` Daniel Vetter
2020-10-05 22:31 ` Daniel Vetter
2020-10-06 4:30 ` Stephen Rothwell
-- strict thread matches above, loose matches on Subject: below --
2023-04-11 6:47 linux-next: build failure after merge of the drm tree Stephen Rothwell
2023-01-19 2:12 Stephen Rothwell
2022-09-30 10:54 broonie
2022-10-04 2:20 ` Stephen Rothwell
2022-10-04 2:24 ` David Airlie
2022-10-04 3:05 ` Stephen Rothwell
2022-10-04 11:39 ` Mark Brown
2022-10-05 15:30 ` Alex Deucher
2022-10-05 16:45 ` Hamza Mahfooz
2022-10-05 22:28 ` Stephen Rothwell
2022-10-06 8:12 ` Stephen Rothwell
2022-10-06 13:56 ` Alex Deucher
2022-10-06 16:52 ` Stephen Rothwell
2022-10-06 16:25 ` Hamza Mahfooz
2022-02-25 16:42 broonie
2022-02-28 3:46 ` Stephen Rothwell
2022-02-28 6:44 ` Hsin-Yi Wang
2022-02-28 6:48 ` Dave Airlie
2022-02-28 15:33 ` Robert Foss
2021-08-20 2:33 Stephen Rothwell
2021-08-20 6:23 ` Masahiro Yamada
2021-09-01 21:50 ` Stephen Rothwell
2021-09-05 22:49 ` Stephen Rothwell
2021-09-06 7:34 ` Daniel Vetter
2021-09-08 3:13 ` Masahiro Yamada
2021-09-08 9:07 ` Daniel Vetter
2021-04-09 3:36 Stephen Rothwell
2021-01-08 0:55 Stephen Rothwell
2021-01-08 1:25 ` Stephen Rothwell
2021-01-10 23:56 ` Stephen Rothwell
2021-01-18 0:59 ` Stephen Rothwell
2021-01-18 1:06 ` Dave Airlie
2021-01-20 12:12 ` Daniel Vetter
2021-01-20 20:44 ` Stephen Rothwell
2020-12-09 1:53 Stephen Rothwell
2020-05-08 4:29 Stephen Rothwell
2019-11-05 2:54 Stephen Rothwell
2019-10-10 0:22 Stephen Rothwell
2019-07-08 4:48 Stephen Rothwell
2019-04-26 2:17 Stephen Rothwell
2018-05-16 6:53 Stephen Rothwell
2018-05-16 8:09 ` Oded Gabbay
2018-05-17 5:00 ` Dave Airlie
2018-03-13 5:46 Stephen Rothwell
2018-01-02 1:48 Stephen Rothwell
2017-09-28 4:57 Stephen Rothwell
2017-03-20 0:51 Stephen Rothwell
2017-03-20 8:03 ` Daniel Vetter
2017-03-20 8:05 ` Daniel Vetter
2017-02-23 23:25 Stephen Rothwell
2017-01-24 1:25 Stephen Rothwell
2017-01-25 10:52 ` Vincent ABRIOU
2016-07-15 3:40 Stephen Rothwell
2016-07-15 4:32 ` Sedat Dilek
2016-04-28 1:57 Stephen Rothwell
2016-04-28 8:11 ` Jani Nikula
2016-03-17 4:41 Stephen Rothwell
2016-03-17 8:41 ` Christian König
2016-02-22 0:45 Stephen Rothwell
2015-12-31 10:31 Stephen Rothwell
2016-01-07 2:44 ` Stephen Rothwell
2016-01-11 22:54 ` Stephen Rothwell
2016-01-12 0:31 ` Dave Airlie
2016-01-12 4:35 ` Stephen Rothwell
2016-01-12 7:48 ` Zhu, Rex
2015-12-31 2:40 Stephen Rothwell
2015-12-31 5:14 ` Mark yao
2015-11-04 9:22 Stephen Rothwell
2015-11-09 16:45 ` Guenter Roeck
2015-11-10 4:55 ` Alexandre Courbot
2015-10-06 1:09 Stephen Rothwell
2015-06-09 13:42 Stephen Rothwell
2015-06-09 14:02 ` Deucher, Alexander
2015-06-10 0:28 ` Stephen Rothwell
2015-05-20 3:08 Stephen Rothwell
2015-05-20 4:41 ` Dave Airlie
2015-05-20 5:25 ` Stephen Rothwell
2015-05-20 5:31 ` Stephen Rothwell
2015-05-20 6:01 ` Oded Gabbay
2015-05-20 6:08 ` Dave Airlie
2015-01-29 2:38 Stephen Rothwell
2015-01-29 8:21 ` Oded Gabbay
2015-01-29 9:35 ` Stephen Rothwell
2014-09-08 4:26 Stephen Rothwell
2014-06-05 4:12 Stephen Rothwell
2014-06-05 4:28 ` Stephen Rothwell
2012-09-24 3:18 Stephen Rothwell
2012-09-24 11:31 ` Daniel Vetter
2012-09-24 11:58 ` Stephen Rothwell
2012-08-24 3:49 Stephen Rothwell
2012-05-17 3:47 Stephen Rothwell
2012-04-30 3:22 Stephen Rothwell
2012-04-23 3:42 Stephen Rothwell
2012-03-16 2:53 Stephen Rothwell
2012-03-19 2:45 ` Stephen Rothwell
2011-11-28 2:49 Stephen Rothwell
2011-11-16 0:30 Stephen Rothwell
2011-11-16 10:16 ` Alan Cox
2011-11-16 16:42 ` Jesse Barnes
2011-11-25 1:49 ` Stephen Rothwell
2011-11-25 10:30 ` Alan Cox
2011-11-25 10:34 ` Dave Airlie
2011-11-28 2:53 ` Stephen Rothwell
2011-11-28 11:30 ` Alan Cox
2011-11-28 13:13 ` Stephen Rothwell
2011-11-28 13:18 ` Alan Cox
2011-11-28 13:53 ` Stephen Rothwell
2011-11-28 14:05 ` Dave Airlie
2011-11-28 14:08 ` Alan Cox
2011-11-28 2:52 ` Stephen Rothwell
2011-11-28 5:07 ` Greg KH
2011-11-28 11:33 ` Alan Cox
2011-03-15 3:49 Stephen Rothwell
2010-04-08 3:12 Stephen Rothwell
2010-04-08 3:52 ` Dave Airlie
2010-04-08 4:14 ` Stephen Rothwell
2010-04-08 16:19 ` Tony Luck
2010-04-08 20:50 ` Pauli Nieminen
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