Daniel Vetter daniel@ffwll.ch writes:
On Wed, Apr 12, 2017 at 12:12:02PM -0700, Eric Anholt wrote:
This is needed for proper synchronization with display on another DRM device (pl111 or tinydrm) with buffers produced by vc4 V3D. Fixes the new igt vc4_dmabuf_poll testcase, and rendering of one of the glmark2 desktop tests on pl111+vc4.
This doesn't yet introduce waits on other device's fences before vc4's rendering/display, because I don't have testcases for them.
v2: Reuse dma_fence_free(), retitle commit message to clarify that it's not a full dma-buf fencing implementation yet.
Signed-off-by: Eric Anholt eric@anholt.net
Double-checked a few things in your ww_mutex scheme, seems are correct. And testing with CONFIG_DEBUG_WW_MUTEX_SLOWPATH should catch any kind of fumbles in your error paths. I didnt do a full review, so just
Yeah, the lockdep and WW debug options were incredibly useful (and I should probably go turn them off now).