From: Gerd Hoffmann <kraxel@redhat.com>
To: "Thomas Hellström (VMware)" <thomas_os@shipmail.org>
Cc: dri-devel@lists.freedesktop.org, Guillaume.Gardet@arm.com,
David Airlie <airlied@linux.ie>,
open list <linux-kernel@vger.kernel.org>,
gurchetansingh@chromium.org, tzimmermann@suse.de,
yuq825@gmail.com, noralf@tronnes.org, robh@kernel.org
Subject: Re: [PATCH v5 1/3] drm/shmem: add support for per object caching flags.
Date: Thu, 27 Feb 2020 14:21:37 +0100 [thread overview]
Message-ID: <20200227132137.irruicvlkxpdo3so@sirius.home.kraxel.org> (raw)
In-Reply-To: <68a05ace-40bc-76d6-5464-2c96328874b9@shipmail.org>
Hi,
> > So I'd like to push patches 1+2 to -fixes and sort everything else later
> > in -next. OK?
>
> OK with me.
Done.
>> [ context: why shmem helpers use pgprot_writecombine + pgprot_decrypted?
>> we get conflicting mappings because of that, linear kernel
>> map vs. gem object vmap/mmap ]
> Do we have any idea what drivers are actually using
> write-combine and decrypted?
drivers/gpu/drm# find -name Kconfig* -print | xargs grep -l DRM_GEM_SHMEM_HELPER
./lima/Kconfig
./tiny/Kconfig
./cirrus/Kconfig
./Kconfig
./panfrost/Kconfig
./udl/Kconfig
./v3d/Kconfig
./virtio/Kconfig
virtio needs cached.
cirrus+udl should be ok with cached too.
Not clue about the others (lima, tiny, panfrost, v3d). Maybe they use
write-combine just because this is what they got by default from
drm_gem_mmap_obj(). Maybe they actually need that. Trying to Cc:
maintainters (and drop stable@).
On decrypted: I guess that is only relevant for virtual machines, i.e.
virtio-gpu and cirrus?
virtio-gpu needs it, otherwise the host can't show the virtual display.
cirrus bounces everything via blits to vram, so it should be ok without
decrypted. I guess that implies we should make decrypted configurable.
cheers,
Gerd
next prev parent reply other threads:[~2020-02-27 13:21 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20200226154752.24328-1-kraxel@redhat.com>
2020-02-26 15:47 ` [PATCH v5 1/3] drm/shmem: add support for per object caching flags Gerd Hoffmann
2020-02-26 16:51 ` Guillaume Gardet
2020-02-26 18:24 ` Thomas Hellström (VMware)
2020-02-27 0:02 ` Chia-I Wu
2020-02-27 7:16 ` Thomas Hellström (VMware)
2020-02-27 7:53 ` Gerd Hoffmann
2020-02-27 8:10 ` Thomas Hellström (VMware)
2020-02-27 10:56 ` Gerd Hoffmann
2020-02-27 12:16 ` Thomas Hellström (VMware)
2020-02-27 13:21 ` Gerd Hoffmann [this message]
2020-02-27 13:44 ` Thomas Hellström (VMware)
2020-02-27 13:49 ` Thomas Hellström (VMware)
2020-02-28 9:49 ` Gerd Hoffmann
2020-02-28 9:54 ` Thomas Hellström (VMware)
2020-02-28 10:46 ` Gerd Hoffmann
2020-03-02 1:56 ` Qiang Yu
2020-02-26 15:47 ` [PATCH v5 2/3] drm/virtio: fix mmap page attributes Gerd Hoffmann
2020-02-26 16:52 ` Guillaume Gardet
2020-02-26 15:47 ` [PATCH v5 3/3] drm/udl: simplify gem object mapping Gerd Hoffmann
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