drm/shmem-helper: Import dmabuf without mapping its sg_table

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[WHY]
1. Drivers using DRM_GEM_SHADOW_PLANE_HELPER_FUNCS and
   DRM_GEM_SHMEM_DRIVER_OPS (e.g., udl, ast) do not require
   sg_table import.
   They only need dma_buf_vmap() to access the shared buffer's
   kernel virtual address.

2. On certain Aspeed-based boards, a dma_mask of 0xffff_ffff may
   trigger SWIOTLB during dmabuf import. However, IO_TLB_SEGSIZE
   restricts the maximum DMA streaming mapping memory, resulting in
   errors like:

   ast 0000:07:00.0: swiotlb buffer is full (sz: 3145728 bytes), total 32768 (slots), used 0 (slots)

[HOW]
Provide a gem_prime_import implementation without sg_table mapping
to avoid issues (e.g., "swiotlb buffer is full"). Drivers that do not
require sg_table can adopt this.

Signed-off-by: Shixiong Ou <oushixiong@kylinos.cn>
Acked-by: Thomas Zimmermann <tzimmermann@suse.de>
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Link: https://lore.kernel.org/r/20250522070714.439824-1-oushixiong1025@163.com

...

This commit is contained in:

Shixiong Ou 2025-05-22 15:07:12 +08:00 • committed by Thomas Zimmermann

parent 6048f55876

commit 660cd44659

4 changed files with 102 additions and 9 deletions

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57

drivers/gpu/drm/drm_gem_shmem_helper.c

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36

drivers/gpu/drm/drm_prime.c

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15

include/drm/drm_gem_shmem_helper.h

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3

include/drm/drm_prime.h

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