Quoting changbin.du@xxxxxxxxx (2017-09-04 09:01:01) > From: Changbin Du <changbin.du@xxxxxxxxx> > > In the past, vGPU alloc fence registers by walking through mm.fence_list > to find fence which pin_count = 0 and vma is empty. vGPU may not find > enough fence registers this way. Because a fence can be bind to vma even > though it is not in using. We have found such failure many times these > days. > > An option to resolve this issue is that we can force-remove fence from > vma in this case. > > This patch added two new api to the fence management code: > - i915_reserve_fence() will try to find a free fence from fence_list > and force-remove vma if need. > - i915_unreserve_fence() reclaim a reserved fence after vGPU has > finished. > > With this change, the fence management is more clear to work with vGPU. > GVTg do not need remove fence from fence_list in private. > > v3: (Chris) > - Add struct_mutex lock assertion. > - Only count for unpinned fence. > > v2: (Chris) > - Rename the new api for symmetry. > - Add safeguard to ensure at least 1 fence remained for host display. > > Signed-off-by: Changbin Du <changbin.du@xxxxxxxxx> > Reviewed-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> Anyone want to give an ack/review for the GVT side, and then I'll push. -Chris _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/intel-gfx
