drm/i915/gt: Tweak flushes around ivb ppgtt (24c66274) · Commits · 戴 / test

A small tweak to flush then invalidate appears to improve the reliability of ppGTT switches on Ivybridge -- but does not improve hsw/vlv bcs reliability. Signed-off-by:

Chris Wilson <chris@chris-wilson.co.uk> Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com> Acked-by:

Mika Kuoppala <mika.kuoppala@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20191231120857.4014900-1-chris@chris-wilson.co.uk

drivers/gpu/drm/i915/gt/intel_ring_submission.c

+2 −2

Original line number	Diff line number	Diff line
		@@ -1394,7 +1394,7 @@ static int load_pd_dir(struct i915_request *rq,

		intel_ring_advance(rq, cs);

		return 0;
		return rq->engine->emit_flush(rq, EMIT_FLUSH);
		}

		static inline int mi_set_context(struct i915_request *rq, u32 flags)
		@@ -1584,7 +1584,7 @@ static int switch_mm(struct i915_request rq, struct i915_address_space vm)
		if (ret)
		return ret;

		return rq->engine->emit_flush(rq, EMIT_FLUSH);
		return rq->engine->emit_flush(rq, EMIT_INVALIDATE);
		}

		static int switch_context(struct i915_request *rq)

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