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.
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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
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