[PATCH 6.1 003/131] drm/i915: Dont set PIPE_CONTROL_FLUSH_L3 for aux inval

Greg Kroah-Hartman
2023-10-16T08:51:58Z

From: Nirmoy Das <nirmoy.das@intel.com>

[ Upstream commit 128c20eda73bd3e78505c574fb17adb46195c98b ]

PIPE_CONTROL_FLUSH_L3 is not needed for aux invalidation
so don't set that.

Fixes: 78a6ccd65fa3 ("drm/i915/gt: Ensure memory quiesced before invalidation")
Cc: Jonathan Cavitt <jonathan.cavitt@intel.com>
Cc: Andi Shyti <andi.shyti@linux.intel.com>
Cc: <stable@vger.kernel.org> # v5.8+
Cc: Andrzej Hajda <andrzej.hajda@intel.com>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Cc: Matt Roper <matthew.d.roper@intel.com>
Cc: Tejas Upadhyay <tejas.upadhyay@intel.com>
Cc: Lucas De Marchi <lucas.demarchi@intel.com>
Cc: Prathap Kumar Valsan <prathap.kumar.valsan@intel.com>
Cc: Tapani Pälli <tapani.palli@intel.com>
Cc: Mark Janes <mark.janes@intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Nirmoy Das <nirmoy.das@intel.com>
Acked-by: Matt Roper <matthew.d.roper@intel.com>
Reviewed-by: Andi Shyti <andi.shyti@linux.intel.com>
Tested-by: Tapani Pälli <tapani.palli@intel.com>
Reviewed-by: Andrzej Hajda <andrzej.hajda@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230926142401.25687-1-nirmoy.das@intel.com
(cherry picked from commit 03d681412b38558aefe4fb0f46e36efa94bb21ef)
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/gpu/drm/i915/gt/gen8_engine_cs.c | 11 ++++++++++-
1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/gt/gen8_engine_cs.c b/drivers/gpu/drm/i915/gt/gen8_engine_cs.c
index cc84685368715..efc22f9b17f07 100644
--- a/drivers/gpu/drm/i915/gt/gen8_engine_cs.c
+++ b/drivers/gpu/drm/i915/gt/gen8_engine_cs.c
@@ -235,8 +235,17 @@ int gen12_emit_flush_rcs(struct i915_request *rq, u32 mode)
u32 flags = 0;
u32 *cs;

+ /*
+ * L3 fabric flush is needed for AUX CCS invalidation
+ * which happens as part of pipe-control so we can
+ * ignore PIPE_CONTROL_FLUSH_L3. Also PIPE_CONTROL_FLUSH_L3
+ * deals with Protected Memory which is not needed for
+ * AUX CCS invalidation and lead to unwanted side effects.
+ */
+ if (mode & EMIT_FLUSH)
+ flags |= PIPE_CONTROL_FLUSH_L3;
+
flags |= PIPE_CONTROL_TILE_CACHE_FLUSH;
- flags |= PIPE_CONTROL_FLUSH_L3;
flags |= PIPE_CONTROL_RENDER_TARGET_CACHE_FLUSH;
flags |= PIPE_CONTROL_DEPTH_CACHE_FLUSH;
/* Wa_1409600907:tgl,adl-p */
--
2.40.1