drm: allow limiting the scatter list size.

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Add drm_device argument to drm_prime_pages_to_sg(), so we can
call dma_max_mapping_size() to figure the segment size limit
and call into __sg_alloc_table_from_pages() with the correct
limit.

This fixes virtio-gpu with sev.  Possibly it'll fix other bugs
too given that drm seems to totaly ignore segment size limits
so far ...

v2: place max_segment in drm driver not gem object.
v3: move max_segment next to the other gem fields.
v4: just use dma_max_mapping_size().

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/20200907112425.15610-2-kraxel@redhat.com

...

This commit is contained in:

Gerd Hoffmann 2020-09-07 13:24:25 +02:00

parent 04e89ff364

commit 707d561f77

14 changed files with 29 additions and 17 deletions

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3

drivers/gpu/drm/amd/amdgpu/amdgpu_dma_buf.c

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drivers/gpu/drm/drm_gem_shmem_helper.c

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drivers/gpu/drm/drm_prime.c

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drivers/gpu/drm/etnaviv/etnaviv_gem.c

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drivers/gpu/drm/etnaviv/etnaviv_gem_prime.c

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drivers/gpu/drm/msm/msm_gem.c

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drivers/gpu/drm/msm/msm_gem_prime.c

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drivers/gpu/drm/nouveau/nouveau_prime.c

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drivers/gpu/drm/radeon/radeon_prime.c

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drivers/gpu/drm/rockchip/rockchip_drm_gem.c

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drivers/gpu/drm/tegra/gem.c

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drivers/gpu/drm/vgem/vgem_drv.c

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drivers/gpu/drm/xen/xen_drm_front_gem.c

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include/drm/drm_prime.h

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