On 17.05.2023 15:22, Tejas Upadhyay wrote:
Wa_14016712196 implementation for mtl
Bspec: 72197
V2:
- Fix kernel test robot warnings
Reported-by: kernel test robot <lkp@xxxxxxxxx>
I do not think robot reported lack of this wa :), putting lkp in
changelog should be enough.
Closes: https://lore.kernel.org/oe-kbuild-all/202305121525.3EWdGoBY-lkp@xxxxxxxxx/
Signed-off-by: Tejas Upadhyay <tejas.upadhyay@xxxxxxxxx>
---
drivers/gpu/drm/i915/gt/gen8_engine_cs.c | 41 ++++++++++++++++++++++++
1 file changed, 41 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..737eb515544b 100644
--- a/drivers/gpu/drm/i915/gt/gen8_engine_cs.c
+++ b/drivers/gpu/drm/i915/gt/gen8_engine_cs.c
@@ -177,14 +177,38 @@ 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, u32 *cs)
+{
+ 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;
+ int err;
if (mode & EMIT_FLUSH) {
u32 flags = 0;
u32 *cs;
+ /* Wa_14016712196 */
+ if (IS_MTL_GRAPHICS_STEP(engine->i915, M, STEP_A0, STEP_B0) ||
+ IS_MTL_GRAPHICS_STEP(engine->i915, P, STEP_A0, STEP_B0)) {
+ /* dummy PIPE_CONTROL + depth flush */
+ cs = intel_ring_begin(rq, 6);
+ err = mtl_dummy_pipe_control(rq, cs);
+ if (err)
+ return err;
Like Andi suggested, you can replace above sequence with:
cs = mtl_dummy_pipe_control(rq);
+ }
+
flags |= PIPE_CONTROL_TILE_CACHE_FLUSH;
flags |= PIPE_CONTROL_FLUSH_L3;
flags |= PIPE_CONTROL_RENDER_TARGET_CACHE_FLUSH;
@@ -218,6 +242,16 @@ int gen12_emit_flush_rcs(struct i915_request *rq, u32 mode)
u32 flags = 0;
u32 *cs, count;
+ /* Wa_14016712196 */
+ if (IS_MTL_GRAPHICS_STEP(engine->i915, M, STEP_A0, STEP_B0) ||
+ IS_MTL_GRAPHICS_STEP(engine->i915, P, STEP_A0, STEP_B0)) {
+ /* dummy PIPE_CONTROL + depth flush */
+ cs = intel_ring_begin(rq, 6);
+ err = mtl_dummy_pipe_control(rq, cs);
+ if (err)
+ return err;
+ }
+
In case gen12_emit_flush_rcs is called with EMIT_BARRIER =
(EMIT_INVALIDATE | EMIT_FLUSH) dummy pipe will be inserted twice, is it OK?
flags |= PIPE_CONTROL_COMMAND_CACHE_INVALIDATE;
flags |= PIPE_CONTROL_TLB_INVALIDATE;
flags |= PIPE_CONTROL_INSTRUCTION_CACHE_INVALIDATE;
@@ -733,6 +767,13 @@ 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);
How do we know there is enough space for dummy pipe?
Regards
Andrzej
+
if (GRAPHICS_VER(i915) == 12 && GRAPHICS_VER_FULL(i915) < IP_VER(12, 50))
/* Wa_1409600907 */
flags |= PIPE_CONTROL_DEPTH_STALL;
