Re: [PATCH 2/3] drm/i915/ringbuffer: EMIT_INVALIDATE after switch context

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On 07/12/2018 09:02, Chris Wilson wrote:
The recommend procedure was to switch contexts (and mm) then invalidate
the TLBs. Make it so.

Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
---
  drivers/gpu/drm/i915/intel_ringbuffer.c | 6 +++---
  1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c
index 16084749adf5..74a4d587c312 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.c
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
@@ -1827,12 +1827,12 @@ static int ring_request_alloc(struct i915_request *request)
  	 */
  	request->reserved_space += LEGACY_REQUEST_SIZE;
- /* Unconditionally invalidate GPU caches and TLBs. */
-	ret = request->engine->emit_flush(request, EMIT_INVALIDATE);
+	ret = switch_context(request);
  	if (ret)
  		return ret;
- ret = switch_context(request);
+	/* Unconditionally invalidate GPU caches and TLBs. */
+	ret = request->engine->emit_flush(request, EMIT_INVALIDATE);
  	if (ret)
  		return ret;

Before my time I'm afraid, but makes some sense on the logical level:

Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>

Regards,

Tvrtko
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