FAILED: patch "[PATCH] drm/i915: Add the gen12_needs_ccs_aux_inv helper" failed to apply to 6.4-stable tree

[<gregkh@linuxfoundation.org>]

The patch below does not apply to the 6.4-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@vger.kernel.org>.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.4.y
git checkout FETCH_HEAD
git cherry-pick -x b2f59e9026038a5bbcbc0019fa58f963138211ee
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<stable@vger.kernel.org>' --in-reply-to '2023080732-tricking-quickstep-30b0@gregkh' --subject-prefix 'PATCH 6.4.y' HEAD^..

Possible dependencies:



thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From b2f59e9026038a5bbcbc0019fa58f963138211ee Mon Sep 17 00:00:00 2001
From: Andi Shyti <andi.shyti@linux.intel.com>
Date: Tue, 25 Jul 2023 02:19:45 +0200
Subject: [PATCH] drm/i915: Add the gen12_needs_ccs_aux_inv helper

We always assumed that a device might either have AUX or FLAT
CCS, but this is an approximation that is not always true, e.g.
PVC represents an exception.

Set the basis for future finer selection by implementing a
boolean gen12_needs_ccs_aux_inv() function that tells whether aux
invalidation is needed or not.

Currently PVC is the only exception to the above mentioned rule.

Requires: 059ae7ae2a1c ("drm/i915/gt: Cleanup aux invalidation registers")
Signed-off-by: Andi Shyti <andi.shyti@linux.intel.com>
Cc: Matt Roper <matthew.d.roper@intel.com>
Cc: Jonathan Cavitt <jonathan.cavitt@intel.com>
Cc: <stable@vger.kernel.org> # v5.8+
Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
Reviewed-by: Andrzej Hajda <andrzej.hajda@intel.com>
Reviewed-by: Nirmoy Das <nirmoy.das@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230725001950.1014671-3-andi.shyti@linux.intel.com
(cherry picked from commit c827655b87ad201ebe36f2e28d16b5491c8f7801)
Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>

diff --git a/drivers/gpu/drm/i915/gt/gen8_engine_cs.c b/drivers/gpu/drm/i915/gt/gen8_engine_cs.c
index 563efee05560..460c9225a50f 100644
--- a/drivers/gpu/drm/i915/gt/gen8_engine_cs.c
+++ b/drivers/gpu/drm/i915/gt/gen8_engine_cs.c
@@ -165,6 +165,18 @@ static u32 preparser_disable(bool state)
 	return MI_ARB_CHECK | 1 << 8 | state;
 }
 
+static bool gen12_needs_ccs_aux_inv(struct intel_engine_cs *engine)
+{
+	if (IS_PONTEVECCHIO(engine->i915))
+		return false;
+
+	/*
+	 * so far platforms supported by i915 having
+	 * flat ccs do not require AUX invalidation
+	 */
+	return !HAS_FLAT_CCS(engine->i915);
+}
+
 u32 *gen12_emit_aux_table_inv(struct intel_gt *gt, u32 *cs, const i915_reg_t inv_reg)
 {
 	u32 gsi_offset = gt->uncore->gsi_offset;
@@ -267,7 +279,7 @@ int gen12_emit_flush_rcs(struct i915_request *rq, u32 mode)
 		else if (engine->class == COMPUTE_CLASS)
 			flags &= ~PIPE_CONTROL_3D_ENGINE_FLAGS;
 
-		if (!HAS_FLAT_CCS(rq->engine->i915))
+		if (gen12_needs_ccs_aux_inv(rq->engine))
 			count = 8 + 4;
 		else
 			count = 8;
@@ -285,7 +297,7 @@ int gen12_emit_flush_rcs(struct i915_request *rq, u32 mode)
 
 		cs = gen8_emit_pipe_control(cs, flags, LRC_PPHWSP_SCRATCH_ADDR);
 
-		if (!HAS_FLAT_CCS(rq->engine->i915)) {
+		if (gen12_needs_ccs_aux_inv(rq->engine)) {
 			/* hsdes: 1809175790 */
 			cs = gen12_emit_aux_table_inv(rq->engine->gt, cs,
 						      GEN12_CCS_AUX_INV);
@@ -307,7 +319,7 @@ int gen12_emit_flush_xcs(struct i915_request *rq, u32 mode)
 	if (mode & EMIT_INVALIDATE) {
 		cmd += 2;
 
-		if (!HAS_FLAT_CCS(rq->engine->i915) &&
+		if (gen12_needs_ccs_aux_inv(rq->engine) &&
 		    (rq->engine->class == VIDEO_DECODE_CLASS ||
 		     rq->engine->class == VIDEO_ENHANCEMENT_CLASS)) {
 			aux_inv = rq->engine->mask &