[Bug 111014] [regression] [bisected] i915 GPU HANG: ecode 7:1:0xfffffffe on Kernel 5.1.x and 5.2rc1 to 5.2rc6

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=111014

--- Comment #9 from Chris Wilson <chris at chris-wilson.co.uk> ---
Please try:

diff --git a/drivers/gpu/drm/i915/gt/intel_ringbuffer.c
b/drivers/gpu/drm/i915/gt/intel_ringbuffer.c
index 81f9b0422e6a..f11ba6da4d1d 100644
--- a/drivers/gpu/drm/i915/gt/intel_ringbuffer.c
+++ b/drivers/gpu/drm/i915/gt/intel_ringbuffer.c
@@ -1811,6 +1811,11 @@ static int ring_request_alloc(struct i915_request
*request)
        if (ret)
                return ret;

+       /* Once again for Ivybridge after updating 3D state. */
+       ret = request->engine->emit_flush(request, EMIT_INVALIDATE);
+       if (ret)
+               return ret;
+
        request->reserved_space -= LEGACY_REQUEST_SIZE;
        return 0;
 }

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