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drm/prime: Unbreak virtgpu dma-buf export
virtgpu "vram" GEM objects do not implement obj->get_sg_table(). But
they also don't use drm_gem_map_dma_buf(). In fact they may not even
have guest visible pages. But it is perfectly fine to export and share
with other virtual devices.
Reported-by: Dominik Behr <dbehr@chromium.org>
Fixes: 207395da5a
("drm/prime: reject DMA-BUF attach when get_sg_table is missing")
Signed-off-by: Rob Clark <robdclark@chromium.org>
Reviewed-by: Simon Ser <contact@emersion.fr>
Signed-off-by: Simon Ser <contact@emersion.fr>
Link: https://patchwork.freedesktop.org/patch/msgid/20240322214801.319975-1-robdclark@gmail.com
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1 changed files with 6 additions and 1 deletions
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@ -582,7 +582,12 @@ int drm_gem_map_attach(struct dma_buf *dma_buf,
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{
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struct drm_gem_object *obj = dma_buf->priv;
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if (!obj->funcs->get_sg_table)
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/*
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* drm_gem_map_dma_buf() requires obj->get_sg_table(), but drivers
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* that implement their own ->map_dma_buf() do not.
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*/
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if (dma_buf->ops->map_dma_buf == drm_gem_map_dma_buf &&
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!obj->funcs->get_sg_table)
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return -ENOSYS;
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return drm_gem_pin(obj);
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