diff options
| author | Ivaylo Dimitrov <ivo.g.dimitrov.75@gmail.com> | 2022-01-19 12:23:10 +0200 |
|---|---|---|
| committer | Tomi Valkeinen <tomi.valkeinen@ideasonboard.com> | 2022-03-28 12:39:51 +0300 |
| commit | 1948d28db6215d055930f0cbb6e300622ede5931 (patch) | |
| tree | bb85608a867696f28adab62cd43cd7e5cd4d6f8b /drivers/gpu/drm/omapdrm/omap_gem.h | |
| parent | 86ad0397250c585096d242dc3c0f774320ed1a80 (diff) | |
| download | linux-1948d28db6215d055930f0cbb6e300622ede5931.tar.bz2 | |
drm: omapdrm: Support exporting of non-contiguous GEM BOs
Currently code allocates non-scanout BOs from SHMEM and those objects are
accessible to userspace by mmap(). However, on devices with no DMM (like
OMAP3), the same objects are not accessible by kernel drivers that want to
render to them as code refuses to export them. In turn this means that on
devices with no DMM, all buffers must be allocated as scanout, otherwise
only CPU can access them. On those devices, scanout buffers are allocated
from CMA, making those allocations highly unreliable.
Fix that by implementing functionality to export SHMEM backed buffers on
devices with no DMM. This makes CMA memory only being used when needed,
instead for every buffer that has to be off-CPU rendered.
Tested on Motorola Droid4 and Nokia N900
Signed-off-by: Ivaylo Dimitrov <ivo.g.dimitrov.75@gmail.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
Link: https://patchwork.freedesktop.org/patch/msgid/1642587791-13222-3-git-send-email-ivo.g.dimitrov.75@gmail.com
Diffstat (limited to 'drivers/gpu/drm/omapdrm/omap_gem.h')
| -rw-r--r-- | drivers/gpu/drm/omapdrm/omap_gem.h | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/gpu/drm/omapdrm/omap_gem.h b/drivers/gpu/drm/omapdrm/omap_gem.h index 19209e319663..4d4488939f6b 100644 --- a/drivers/gpu/drm/omapdrm/omap_gem.h +++ b/drivers/gpu/drm/omapdrm/omap_gem.h @@ -82,7 +82,8 @@ u32 omap_gem_flags(struct drm_gem_object *obj); int omap_gem_rotated_dma_addr(struct drm_gem_object *obj, u32 orient, int x, int y, dma_addr_t *dma_addr); int omap_gem_tiled_stride(struct drm_gem_object *obj, u32 orient); -struct sg_table *omap_gem_get_sg(struct drm_gem_object *obj); +struct sg_table *omap_gem_get_sg(struct drm_gem_object *obj, + enum dma_data_direction dir); void omap_gem_put_sg(struct drm_gem_object *obj, struct sg_table *sgt); #endif /* __OMAPDRM_GEM_H__ */ |