Hi all,
As part of all the recent discussions around ttm and dma_resv I started looking into this. The goal (at least somewhen in the near future) is to have it all documented and the cross-driver semantics locked down as much as possible.
One of the biggest issues there is how the dma_resv ww_mutex fits into the overall locking hierarchy, especially wrt core mm locks. This patch series should fix that.
Comments, review and especially testing (there's only so much you can do with auditing) very much appreciated.
Cheers, Daniel
Daniel Vetter (3): dma_resv: prime lockdep annotations drm/nouveau: slowpath for pushbuf ioctl drm/ttm: remove ttm_bo_wait_unreserved
drivers/dma-buf/dma-resv.c | 12 ++++++ drivers/gpu/drm/nouveau/nouveau_gem.c | 57 ++++++++++++++++++--------- drivers/gpu/drm/ttm/ttm_bo.c | 34 ---------------- drivers/gpu/drm/ttm/ttm_bo_vm.c | 26 +----------- include/drm/ttm/ttm_bo_api.h | 1 - 5 files changed, 51 insertions(+), 79 deletions(-)