drm/i915/gt: Avoid using tag 0 for the very first submission (7b02b23e) · Commits · 戴 / test

Assume that the HW starts off with tag 0 "active" and so avoid using tag 0 for our own first ELSP submission. Signed-off-by:

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

+3 −1

Original line number	Diff line number	Diff line
		@@ -1108,7 +1108,7 @@ __execlists_schedule_in(struct i915_request *rq)
		/* We don't need a strict matching tag, just different values */
		ce->lrc_desc &= ~GENMASK_ULL(47, 37);
		ce->lrc_desc \|=
		(u64)(engine->context_tag++ % NUM_CONTEXT_TAG) <<
		(u64)(++engine->context_tag % NUM_CONTEXT_TAG) <<
		GEN11_SW_CTX_ID_SHIFT;
		BUILD_BUG_ON(NUM_CONTEXT_TAG > GEN12_MAX_CONTEXT_HW_ID);
		}
		@@ -2925,6 +2925,8 @@ static void enable_execlists(struct intel_engine_cs *engine)
		RING_HWS_PGA,
		i915_ggtt_offset(engine->status_page.vma));
		ENGINE_POSTING_READ(engine, RING_HWS_PGA);

		engine->context_tag = 0;
		}

		static bool unexpected_starting_state(struct intel_engine_cs *engine)