On 2017.09.04 11:01:41 +0100, Chris Wilson wrote: > 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. Acked-by: Zhenyu Wang <zhenyuw@xxxxxxxxxxxxxxx> thanks -- Open Source Technology Center, Intel ltd. $gpg --keyserver wwwkeys.pgp.net --recv-keys 4D781827
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