This patch sets CONFIG_DMABUF_HEAPS_SYSTEM to tristate and exports the
symbol dma_heap_get_dev() to allow the DMA-BUF system heap to be a
module.
This change is intended to allow partners to continue using
device/SoC-specific optimizations in their system heap implementations
when they switch from ION to DMA-BUF heaps. The ION system heap was
built-in and partners were asked to override the system heap ID with
their own if they wanted to override the GKI system heap. This
per-vendor approach to override system heap will no longer be possible
with DMA-BUF heaps since Android S aims to restrict framework access to
DMA-BUF vendor heaps by only letting it access ABI-defined vendor heaps.
VTS tests will be created to ensure that the system heap is present
at /dev/dma_heap/system and behaves as expected of the system heap.
Bug: 175697666
Bug: 155218010
Bug: 172527615
Change-Id: Iabb24d9aedde308a9b15509781dd0e6b67353e99
Signed-off-by: Hridya Valsaraju <hridya@google.com>
(cherry picked from commit c975699b4953ea3251695c16ef65ecb722c91188)
Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>
f6b97b46d1