diff options
| author | Simon Ser <contact@emersion.fr> | 2023-03-02 15:35:09 +0100 |
|---|---|---|
| committer | Simon Ser <contact@emersion.fr> | 2023-04-03 14:31:24 +0200 |
| commit | 207395da5a97035f06360638f0c2fcd92963ce95 (patch) | |
| tree | 8edd4472bc3e815370950e38efbeaa104aeb30f4 /drivers/gpu/drm/drm_prime.c | |
| parent | drm/bridge: lt8912b: Fix DSI Video Mode (diff) | |
| download | linux-207395da5a97035f06360638f0c2fcd92963ce95.tar.xz linux-207395da5a97035f06360638f0c2fcd92963ce95.zip | |
drm/prime: reject DMA-BUF attach when get_sg_table is missing
drm_gem_map_dma_buf() requires drm_gem_object_funcs.get_sg_table
to be implemented, or else WARNs.
Allow drivers to leave this hook unimplemented to implement purely
local DMA-BUFs (ie, DMA-BUFs which cannot be imported anywhere
else but the device which allocated them). In that case, reject
imports to other devices in drm_gem_map_attach().
v2: new patch
v3: use ENOSYS
Signed-off-by: Simon Ser <contact@emersion.fr>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Tian Tao <tiantao6@hisilicon.com>
Cc: Maxime Ripard <maxime@cerno.tech>
Cc: Hans de Goede <hdegoede@redhat.com>
Acked-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Christian König <christian.koenig@amd.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230302143502.500661-1-contact@emersion.fr
Diffstat (limited to 'drivers/gpu/drm/drm_prime.c')
| -rw-r--r-- | drivers/gpu/drm/drm_prime.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/drivers/gpu/drm/drm_prime.c b/drivers/gpu/drm/drm_prime.c index 149cd4ff6a3b..d29dafce9bb0 100644 --- a/drivers/gpu/drm/drm_prime.c +++ b/drivers/gpu/drm/drm_prime.c @@ -544,7 +544,8 @@ int drm_prime_handle_to_fd_ioctl(struct drm_device *dev, void *data, * Optional pinning of buffers is handled at dma-buf attach and detach time in * drm_gem_map_attach() and drm_gem_map_detach(). Backing storage itself is * handled by drm_gem_map_dma_buf() and drm_gem_unmap_dma_buf(), which relies on - * &drm_gem_object_funcs.get_sg_table. + * &drm_gem_object_funcs.get_sg_table. If &drm_gem_object_funcs.get_sg_table is + * unimplemented, exports into another device are rejected. * * For kernel-internal access there's drm_gem_dmabuf_vmap() and * drm_gem_dmabuf_vunmap(). Userspace mmap support is provided by @@ -583,6 +584,9 @@ int drm_gem_map_attach(struct dma_buf *dma_buf, { struct drm_gem_object *obj = dma_buf->priv; + if (!obj->funcs->get_sg_table) + return -ENOSYS; + return drm_gem_pin(obj); } EXPORT_SYMBOL(drm_gem_map_attach); |