drm/msm/gem: Add metadata

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The EXT_external_objects extension is a bit awkward as it doesn't pass
explicit modifiers, leaving the importer to guess with incomplete
information.  In the case of vk (turnip) exporting and gl (freedreno)
importing, the "OPTIMAL_TILING_EXT" layout depends on VkImageCreateInfo
flags (among other things), which the importer does not know.  Which
unfortunately leaves us with the need for a metadata back-channel.

The contents of the metadata are defined by userspace.  The
EXT_external_objects extension is only required to work between
compatible versions of gl and vk drivers, as defined by device and
driver UUIDs.

v2: add missing metadata kfree
v3: Rework to move copy_from/to_user out from under gem obj lock
    to avoid angering lockdep about deadlocks against fs-reclaim

Signed-off-by: Rob Clark <robdclark@chromium.org>
Patchwork: https://patchwork.freedesktop.org/patch/566157/

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This commit is contained in:

Rob Clark 2023-11-06 10:50:26 -08:00

parent d1912f6972

commit 9902cb999e

4 changed files with 98 additions and 1 deletions

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92

drivers/gpu/drm/msm/msm_drv.c

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1

drivers/gpu/drm/msm/msm_gem.c

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4

drivers/gpu/drm/msm/msm_gem.h

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2

include/uapi/drm/msm_drm.h

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