[Bug 90363] New: [nv50] HW state is not reset correctly when using a new GL context - bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ

From: bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ@public.gmane.org
To: nouveau-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org
Subject: [Bug 90363] New: [nv50] HW state is not reset correctly when using a new GL context
Date: Thu, 07 May 2015 16:46:53 +0000	[thread overview]
Message-ID: <bug-90363-8800@http.bugs.freedesktop.org/> (raw)

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https://bugs.freedesktop.org/show_bug.cgi?id=90363

            Bug ID: 90363
           Summary: [nv50] HW state is not reset correctly when using a
                    new GL context
           Product: Mesa
           Version: git
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/DRI/nouveau
          Assignee: nouveau-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org
          Reporter: matteo.mystral-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org
        QA Contact: nouveau-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org

Created attachment 115622
  --> https://bugs.freedesktop.org/attachment.cgi?id=115622&action=edit
Hack

Hardware state is not reset correctly when a process makes use of a new GL
context, after it has used and then destroyed the previous one.
This manifests in a (still uncommitted,
https://www.winehq.org/pipermail/wine-patches/2015-April/138974.html) Wine test
which fails on nv50. Actually commenting out stream_test(), which makes use of
instanced draws with ARB_instanced_arrays, workarounds the issue.
A single process executes both tests, destroying and then recreating a GL
context in between. AFAIU specifically the per-instance enable flags are never
reset on the HW and that breaks the latter test.

I'm attaching a patch which "fixes" the issue for me but it's not the correct
approach.

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