From: Christoph Hellwig <hch@lst•de>
To: Mark Rutland <mark.rutland@arm•com>
Cc: Rob Clark <robdclark@chromium•org>,
Maxime Ripard <maxime.ripard@bootlin•com>,
Catalin Marinas <catalin.marinas@arm•com>,
David Airlie <airlied@linux•ie>,
Maarten Lankhorst <maarten.lankhorst@linux•intel.com>,
LKML <linux-kernel@vger•kernel.org>,
dri-devel <dri-devel@lists•freedesktop.org>,
Sean Paul <sean@poorly•run>, Rob Clark <robdclark@gmail•com>,
linux-arm-kernel@lists•infradead.org,
Daniel Vetter <daniel@ffwll•ch>,
Greg Kroah-Hartman <gregkh@linuxfoundation•org>,
Thomas Gleixner <tglx@linutronix•de>,
Will Deacon <will@kernel•org>, Christoph Hellwig <hch@lst•de>,
Allison Randal <allison@lohutok•net>
Subject: Re: [PATCH 1/2] drm: add cache support for arm64
Date: Thu, 8 Aug 2019 09:53:51 +0200 [thread overview]
Message-ID: <20190808075351.GC30308@lst.de> (raw)
In-Reply-To: <20190807123807.GD54191@lakrids.cambridge.arm.com>
On Wed, Aug 07, 2019 at 01:38:08PM +0100, Mark Rutland wrote:
> > I *believe* that there are not alias mappings (that I don't control
> > myself) for pages coming from
> > shmem_file_setup()/shmem_read_mapping_page()..
>
> AFAICT, that's regular anonymous memory, so there will be a cacheable
> alias in the linear/direct map.
Yes. Although shmem is in no way special in that regard. Even with the
normal dma_alloc_coherent implementation on arm and arm64 we keep the
cacheable alias in the direct mapping and just create a new non-cacheable
one. The only exception are CMA allocations on 32-bit arm, which do
get remapped to uncachable in place.
_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists•infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2019-08-08 7:54 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-05 21:14 [PATCH 1/2] drm: add cache support for arm64 Rob Clark
2019-08-06 8:48 ` Christoph Hellwig
2019-08-06 9:38 ` Daniel Vetter
2019-08-06 11:38 ` Christoph Hellwig
2019-08-06 14:11 ` Rob Clark
2019-08-06 14:34 ` Mark Rutland
2019-08-06 16:31 ` Rob Clark
2019-08-07 12:38 ` Mark Rutland
2019-08-07 16:15 ` Rob Clark
2019-08-07 16:49 ` Mark Rutland
2019-08-07 17:30 ` Rob Clark
2019-08-08 7:59 ` Christoph Hellwig
2019-08-08 16:44 ` Rob Clark
2019-08-09 8:18 ` Christoph Hellwig
2019-08-08 7:58 ` Christoph Hellwig
2019-08-08 10:20 ` Mark Rutland
2019-08-08 10:24 ` Mark Rutland
2019-08-08 10:32 ` Will Deacon
2019-08-08 7:53 ` Christoph Hellwig [this message]
2019-08-06 15:50 ` Christoph Hellwig
2019-08-06 16:23 ` Rob Clark
2019-08-06 16:26 ` Rob Clark
2019-08-07 6:25 ` Christoph Hellwig
2019-08-07 8:48 ` Daniel Vetter
2019-08-08 9:55 ` Christoph Hellwig
2019-08-08 11:58 ` Daniel Vetter
2019-08-09 8:14 ` Christoph Hellwig
2019-08-07 16:09 ` Rob Clark
2019-08-08 10:00 ` Christoph Hellwig
2019-08-08 16:32 ` Rob Clark
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20190808075351.GC30308@lst.de \
--to=hch@lst$(echo .)de \
--cc=airlied@linux$(echo .)ie \
--cc=allison@lohutok$(echo .)net \
--cc=catalin.marinas@arm$(echo .)com \
--cc=daniel@ffwll$(echo .)ch \
--cc=dri-devel@lists$(echo .)freedesktop.org \
--cc=gregkh@linuxfoundation$(echo .)org \
--cc=linux-arm-kernel@lists$(echo .)infradead.org \
--cc=linux-kernel@vger$(echo .)kernel.org \
--cc=maarten.lankhorst@linux$(echo .)intel.com \
--cc=mark.rutland@arm$(echo .)com \
--cc=maxime.ripard@bootlin$(echo .)com \
--cc=robdclark@chromium$(echo .)org \
--cc=robdclark@gmail$(echo .)com \
--cc=sean@poorly$(echo .)run \
--cc=tglx@linutronix$(echo .)de \
--cc=will@kernel$(echo .)org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox