This is adaptation of the Rob Herring's gbm_gralloc HAL [1] to work
as minigbm backend, optimised to work in modern Android conditions.
gbm_gralloc has a huge potential and can provide more-or-less optimal
allocation by using mesa3d allocation APIs. It should work out of the
box for the all hardware mesa3d is supported.
Limitations:
This backend doesn't care of any other SOC-specific graphical components
such as camera, hardware video codecs, etc.
Differences between gbm_gralloc:
1. Designed to distinguish between Allocator and Mapper-sphal users.
For Allocator gbm driver is initialized using standalone KMS card
node (but only if 'lima', 'panfrost' or 'v3d' GPU was detected).
For Mapper requests driver is initialized only using GPU render node.
(which require less permissions for regular apps but suffitient
for mapping).
2. GBM driver is initialized and bo is imported into gbm_mesa only
if Mapper imports bo with software usage flags.
(no time wasted in case SW access isn't required)
3. gbm_gralloc supported only HAL_PIXEL_FORMAT_YV12 video format. This
driver aims to support more formats (using linear modifier only).
* NOTE:
This may also require:
1. Adding secomp rule into the mediaswcodec.policy file
"sched_getaffinity: 1"
2. Adding records to selinux vendor/file_contexts file
"/vendor/lib{64}?/libgbm_mesa_wrapper.so
u:object_r:same_process_hal_file:s0"
"/vendor/bin/hw/android\.hardware\.graphics\.allocator@4\.0-service\.minigbm_gbm_mesa
u:object_r:hal_graphics_allocator_default_exec:s0"
3. Kernel v5.3+ for using fstat(dma-buf)->inode as unique buffer id
[1]: https://github.com/robherring/gbm_gralloc
v2:
- Fixed incorrect size calculations for NV12 buffers
- Add etnaviv, freedreno and vc4 to gpus list which require kmsro entry
- Rebased
v3:
Squashed local fix commits:
- RPI4: Add alignment for CSI camera
- gbm_mesa: Handle DRM_FORMAT_R8 format to handle BLOBS
- gbm_mesa: Always use DRM_FORMAT_R8 for buffers that unsupported by GBM
- gbm_mesa: Add RGB888 format support for CPU access
- gbm_mesa: Remove incorrect negation
- gbm_mesa: Fallback COMPOSER buffers into VRAM
- gbm_mesa: Add combinations to support external camera
v4:
- Use dlopen/dlsym to access gbm_wrapper
- Add fallback allocation for unsupported by mesa3d formats
v5:
- Obtain map-time stride and report it to Android as pixel-stride.
Map-time strides are different after gbm_create and gbm_import.
Use map stride after gbm_import.
This fixes artifacts on Intel and Nouveau.
- GBM wrapper has been converted from cpp to c
- Code refactor and cleanup
- Licence headers added
Signed-off-by: Roman Stratiienko <r.stratiienko@gmail.com>
Change-Id: If0f3dac42bea74f97a87e5a682380c33f4ff6837
