For mtl, workaround suggests that, SW insert a dummy PIPE_CONTROL prior to PIPE_CONTROL which contains a post sync: Timestamp or Write Immediate. Bspec: 72197 V5: - Remove ret variable - Andi V4: - Update commit message, avoid returing cs - Andi/Matt V3: - Wrap dummy pipe control stuff in API - Andi V2: - Fix kernel test robot warnings Closes: https://lore.kernel.org/oe-kbuild-all/202305121525.3EWdGoBY-lkp@xxxxxxxxx/ Reviewed-by: Andi Shyti <andi.shyti@xxxxxxxxxxxxxxx> Signed-off-by: Tejas Upadhyay <tejas.upadhyay@xxxxxxxxx> --- drivers/gpu/drm/i915/gt/gen8_engine_cs.c | 38 ++++++++++++++++++++++++ 1 file changed, 38 insertions(+) diff --git a/drivers/gpu/drm/i915/gt/gen8_engine_cs.c b/drivers/gpu/drm/i915/gt/gen8_engine_cs.c index e1c76e5bfa82..23857cc08eca 100644 --- a/drivers/gpu/drm/i915/gt/gen8_engine_cs.c +++ b/drivers/gpu/drm/i915/gt/gen8_engine_cs.c @@ -177,14 +177,40 @@ u32 *gen12_emit_aux_table_inv(struct intel_gt *gt, u32 *cs, const i915_reg_t inv return cs; } +static int mtl_dummy_pipe_control(struct i915_request *rq) +{ + /* Wa_14016712196 */ + if (IS_MTL_GRAPHICS_STEP(rq->engine->i915, M, STEP_A0, STEP_B0) || + IS_MTL_GRAPHICS_STEP(rq->engine->i915, P, STEP_A0, STEP_B0)) { + u32 *cs; + + /* dummy PIPE_CONTROL + depth flush */ + cs = intel_ring_begin(rq, 6); + if (IS_ERR(cs)) + return PTR_ERR(cs); + cs = gen12_emit_pipe_control(cs, + 0, + PIPE_CONTROL_DEPTH_CACHE_FLUSH, + LRC_PPHWSP_SCRATCH_ADDR); + intel_ring_advance(rq, cs); + } + + return 0; +} + int gen12_emit_flush_rcs(struct i915_request *rq, u32 mode) { struct intel_engine_cs *engine = rq->engine; if (mode & EMIT_FLUSH) { u32 flags = 0; + int err; u32 *cs; + err = mtl_dummy_pipe_control(rq); + if (err) + return err; + flags |= PIPE_CONTROL_TILE_CACHE_FLUSH; flags |= PIPE_CONTROL_FLUSH_L3; flags |= PIPE_CONTROL_RENDER_TARGET_CACHE_FLUSH; @@ -217,6 +243,11 @@ int gen12_emit_flush_rcs(struct i915_request *rq, u32 mode) if (mode & EMIT_INVALIDATE) { u32 flags = 0; u32 *cs, count; + int err; + + err = mtl_dummy_pipe_control(rq); + if (err) + return err; flags |= PIPE_CONTROL_COMMAND_CACHE_INVALIDATE; flags |= PIPE_CONTROL_TLB_INVALIDATE; @@ -733,6 +764,13 @@ u32 *gen12_emit_fini_breadcrumb_rcs(struct i915_request *rq, u32 *cs) PIPE_CONTROL_DC_FLUSH_ENABLE | PIPE_CONTROL_FLUSH_ENABLE); + /* Wa_14016712196 */ + if (IS_MTL_GRAPHICS_STEP(i915, M, STEP_A0, STEP_B0) || + IS_MTL_GRAPHICS_STEP(i915, P, STEP_A0, STEP_B0)) + /* dummy PIPE_CONTROL + depth flush */ + cs = gen12_emit_pipe_control(cs, 0, + PIPE_CONTROL_DEPTH_CACHE_FLUSH, 0); + if (GRAPHICS_VER(i915) == 12 && GRAPHICS_VER_FULL(i915) < IP_VER(12, 50)) /* Wa_1409600907 */ flags |= PIPE_CONTROL_DEPTH_STALL; -- 2.25.1
