Re: [PATCH v3 3/3] drm/i915/guc: Enable Wa_14019159160

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Hi John,

On 04-01-2024 23:35, John.C.Harrison@xxxxxxxxx wrote:
From: John Harrison <John.C.Harrison@xxxxxxxxx>

Use the new w/a KLV support to enable a MTL w/a. Note, this w/a is a
super-set of Wa_16019325821, so requires turning that one as well as
setting the new flag for Wa_14019159160 itself.

Signed-off-by: John Harrison <John.C.Harrison@xxxxxxxxx>
Reviewed-by: Vinay Belgaumkar <vinay.belgaumkar@xxxxxxxxx>
---
  drivers/gpu/drm/i915/gt/gen8_engine_cs.c      |  3 ++
  drivers/gpu/drm/i915/gt/intel_engine_types.h  |  1 +
  drivers/gpu/drm/i915/gt/uc/abi/guc_klvs_abi.h |  7 ++++
  drivers/gpu/drm/i915/gt/uc/intel_guc.c        |  1 +
  drivers/gpu/drm/i915/gt/uc/intel_guc_ads.c    | 34 ++++++++++++++-----
  .../gpu/drm/i915/gt/uc/intel_guc_submission.c |  1 +
  6 files changed, 38 insertions(+), 9 deletions(-)

diff --git a/drivers/gpu/drm/i915/gt/gen8_engine_cs.c b/drivers/gpu/drm/i915/gt/gen8_engine_cs.c
index 9cccd60a5c41d..359b21fb02ab2 100644
--- a/drivers/gpu/drm/i915/gt/gen8_engine_cs.c
+++ b/drivers/gpu/drm/i915/gt/gen8_engine_cs.c
@@ -744,6 +744,7 @@ static u32 *gen12_emit_preempt_busywait(struct i915_request *rq, u32 *cs)
/* Wa_14014475959:dg2 */
  /* Wa_16019325821 */
+/* Wa_14019159160 */
  #define HOLD_SWITCHOUT_SEMAPHORE_PPHWSP_OFFSET	0x540
  static u32 hold_switchout_semaphore_offset(struct i915_request *rq)
  {
@@ -753,6 +754,7 @@ static u32 hold_switchout_semaphore_offset(struct i915_request *rq)
/* Wa_14014475959:dg2 */
  /* Wa_16019325821 */
+/* Wa_14019159160 */
  static u32 *hold_switchout_emit_wa_busywait(struct i915_request *rq, u32 *cs)
  {
  	int i;
@@ -793,6 +795,7 @@ gen12_emit_fini_breadcrumb_tail(struct i915_request *rq, u32 *cs)
/* Wa_14014475959:dg2 */
  	/* Wa_16019325821 */
+	/* Wa_14019159160 */
  	if (intel_engine_uses_wa_hold_switchout(rq->engine))
  		cs = hold_switchout_emit_wa_busywait(rq, cs);
diff --git a/drivers/gpu/drm/i915/gt/intel_engine_types.h b/drivers/gpu/drm/i915/gt/intel_engine_types.h
index b519812ba120d..ba55c059063db 100644
--- a/drivers/gpu/drm/i915/gt/intel_engine_types.h
+++ b/drivers/gpu/drm/i915/gt/intel_engine_types.h
@@ -697,6 +697,7 @@ intel_engine_has_relative_mmio(const struct intel_engine_cs * const engine)
/* Wa_14014475959:dg2 */
  /* Wa_16019325821 */
+/* Wa_14019159160 */
  static inline bool
  intel_engine_uses_wa_hold_switchout(struct intel_engine_cs *engine)
  {
diff --git a/drivers/gpu/drm/i915/gt/uc/abi/guc_klvs_abi.h b/drivers/gpu/drm/i915/gt/uc/abi/guc_klvs_abi.h
index 58012edd4eb0e..bebf28e3c4794 100644
--- a/drivers/gpu/drm/i915/gt/uc/abi/guc_klvs_abi.h
+++ b/drivers/gpu/drm/i915/gt/uc/abi/guc_klvs_abi.h
@@ -101,4 +101,11 @@ enum {
  	GUC_CONTEXT_POLICIES_KLV_NUM_IDS = 5,
  };
+/*
+ * Workaround keys:
+ */
+enum {
+	GUC_WORKAROUND_KLV_SERIALIZED_RA_MODE				= 0x9001,
+};
+
  #endif /* _ABI_GUC_KLVS_ABI_H */
diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc.c b/drivers/gpu/drm/i915/gt/uc/intel_guc.c
index d5c856be31491..db3cb628f40dc 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_guc.c
+++ b/drivers/gpu/drm/i915/gt/uc/intel_guc.c
@@ -295,6 +295,7 @@ static u32 guc_ctl_wa_flags(struct intel_guc *guc)
  		flags |= GUC_WA_HOLD_CCS_SWITCHOUT;
/* Wa_16019325821 */
+	/* Wa_14019159160 */
  	if (IS_GFX_GT_IP_RANGE(gt, IP_VER(12, 70), IP_VER(12, 71)))
  		flags |= GUC_WA_RCS_CCS_SWITCHOUT;
diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_ads.c b/drivers/gpu/drm/i915/gt/uc/intel_guc_ads.c
index 6af3fa8b92e34..68d9e277eca8b 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_guc_ads.c
+++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_ads.c
@@ -815,6 +815,25 @@ guc_capture_prep_lists(struct intel_guc *guc)
  	return PAGE_ALIGN(total_size);
  }
+/* Wa_14019159160 */
+static u32 guc_waklv_ra_mode(struct intel_guc *guc, u32 offset, u32 remain)
+{
How about making this function generic by passing KLV id as arg?
+	u32 size;
+	u32 klv_entry[] = {
+		/* 16:16 key/length */
+		FIELD_PREP(GUC_KLV_0_KEY, GUC_WORKAROUND_KLV_SERIALIZED_RA_MODE) |
+		FIELD_PREP(GUC_KLV_0_LEN, 0),
+		/* 0 dwords data */
+	};
+
+	size = sizeof(klv_entry);
+	GEM_BUG_ON(remain < size);
+
+	iosys_map_memcpy_to(&guc->ads_map, offset, klv_entry, size);
Otherwise preparing and adding klv entry can be wrapped in generic function.

Regards,
Badal
+
+	return size;
+}
+
  static void guc_waklv_init(struct intel_guc *guc)
  {
  	struct intel_gt *gt = guc_to_gt(guc);
@@ -830,15 +849,12 @@ static void guc_waklv_init(struct intel_guc *guc)
  	offset = guc_ads_waklv_offset(guc);
  	remain = guc_ads_waklv_size(guc);
- /*
-	 * Add workarounds here:
-	 *
-	 * if (want_wa_<name>) {
-	 *	size = guc_waklv_<name>(guc, offset, remain);
-	 *	offset += size;
-	 *	remain -= size;
-	 * }
-	 */
+	/* Wa_14019159160 */
+	if (IS_GFX_GT_IP_RANGE(gt, IP_VER(12, 70), IP_VER(12, 71))) {
+		size = guc_waklv_ra_mode(guc, offset, remain);
+		offset += size;
+		remain -= size;
+	}
size = guc_ads_waklv_size(guc) - remain;
  	if (!size)
diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
index b09b97c9cd120..80da3573706fa 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
+++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
@@ -4385,6 +4385,7 @@ static void guc_default_vfuncs(struct intel_engine_cs *engine)
  			engine->flags |= I915_ENGINE_USES_WA_HOLD_SWITCHOUT;
/* Wa_16019325821 */
+	/* Wa_14019159160 */
  	if ((engine->class == COMPUTE_CLASS || engine->class == RENDER_CLASS) &&
  	    IS_GFX_GT_IP_RANGE(engine->gt, IP_VER(12, 70), IP_VER(12, 71)))
  		engine->flags |= I915_ENGINE_USES_WA_HOLD_SWITCHOUT;



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