This is a note to let you know that I've just added the patch titled
drm/i915: Add the gen12_needs_ccs_aux_inv helper
to the 6.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
drm-i915-add-the-gen12_needs_ccs_aux_inv-helper.patch
and it can be found in the queue-6.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 0a8bb48e6df7a1383498fe8104a2dfc11bf8df6f
Author: Andi Shyti <andi.shyti@xxxxxxxxxxxxxxx>
Date: Tue Jul 25 02:19:45 2023 +0200
drm/i915: Add the gen12_needs_ccs_aux_inv helper
[ Upstream commit b2f59e9026038a5bbcbc0019fa58f963138211ee ]
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@xxxxxxxxxxxxxxx>
Cc: Matt Roper <matthew.d.roper@xxxxxxxxx>
Cc: Jonathan Cavitt <jonathan.cavitt@xxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx> # v5.8+
Reviewed-by: Matt Roper <matthew.d.roper@xxxxxxxxx>
Reviewed-by: Andrzej Hajda <andrzej.hajda@xxxxxxxxx>
Reviewed-by: Nirmoy Das <nirmoy.das@xxxxxxxxx>
Link: https://patchwork.freedesktop.org/patch/msgid/20230725001950.1014671-3-andi.shyti@xxxxxxxxxxxxxxx
(cherry picked from commit c827655b87ad201ebe36f2e28d16b5491c8f7801)
Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/gpu/drm/i915/gt/gen8_engine_cs.c b/drivers/gpu/drm/i915/gt/gen8_engine_cs.c
index f4ed89646fd26..c5b926e3f20d7 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;
@@ -236,7 +248,7 @@ 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;
@@ -254,7 +266,7 @@ 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);
@@ -276,7 +288,7 @@ 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 &
