drm/sharp-memory: Do not access GEM-DMA vaddr directly

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[ Upstream commit 136c374d8c ]

Use DRM's shadow-plane helper to map and access the GEM object's buffer
within kernel address space. Encapsulates the vmap logic in the GEM-DMA
helpers.

The sharp-memory driver currently reads the vaddr field from the GME
buffer object directly. This only works because GEM code 'automagically'
sets vaddr.

Shadow-plane helpers perform the same steps, but with correct abstraction
behind drm_gem_vmap(). The shadow-plane state provides the buffer address
in kernel address space and the format-conversion state.

v2:
- fix typo in commit description

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
Link: https://lore.kernel.org/r/20250627152327.8244-1-tzimmermann@suse.de
Signed-off-by: Sasha Levin <sashal@kernel.org>

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Thomas Zimmermann 2025-06-27 17:23:09 +02:00 • committed by Greg Kroah-Hartman

parent 0f889675c5

commit ccffcbf8e0

1 changed files with 13 additions and 14 deletions

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drivers/gpu/drm/tiny/sharp-memory.c

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