[PATCH 3/4] drm/i915/mtl: Skip MCR ops for ring fault register

[Nirmoy Das]

On MTL GEN12_RING_FAULT_REG is not replicated so don't
do mcr based operation for this register.

v2: use MEDIA_VER() instead of GRAPHICS_VER()(Matt).
v3: s/"MEDIA_VER(i915) == 13"/"MEDIA_VER(i915) >= 13"(Matt)
    improve comment.
v4: improve the comment further(Andi)

Signed-off-by: Nirmoy Das <nirmoy.das at intel.com>
Reviewed-by: Matt Roper <matthew.d.roper at intel.com>
Reviewed-by: Andi Shyti <andi.shyti at linux.intel.com>
Reviewed-by: Andrzej Hajda <andrzej.hajda at intel.com>
---
 drivers/gpu/drm/i915/gt/intel_gt.c      | 13 ++++++++++++-
 drivers/gpu/drm/i915/gt/intel_gt_regs.h |  1 +
 drivers/gpu/drm/i915/i915_gpu_error.c   | 11 ++++++++++-
 3 files changed, 23 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/gt/intel_gt.c b/drivers/gpu/drm/i915/gt/intel_gt.c
index 93062c35e072..dff8bba1f5d4 100644
--- a/drivers/gpu/drm/i915/gt/intel_gt.c
+++ b/drivers/gpu/drm/i915/gt/intel_gt.c
@@ -262,10 +262,21 @@ intel_gt_clear_error_registers(struct intel_gt *gt,
 				   I915_MASTER_ERROR_INTERRUPT);
 	}
 
-	if (GRAPHICS_VER_FULL(i915) >= IP_VER(12, 50)) {
+	/*
+	 * For the media GT, this ring fault register is not replicated,
+	 * so don't do multicast/replicated register read/write operation on it.
+	 */
+	if (MEDIA_VER(i915) >= 13 && gt->type == GT_MEDIA) {
+		intel_uncore_rmw(uncore, XELPMP_RING_FAULT_REG,
+				 RING_FAULT_VALID, 0);
+		intel_uncore_posting_read(uncore,
+					  XELPMP_RING_FAULT_REG);
+
+	} else if (GRAPHICS_VER_FULL(i915) >= IP_VER(12, 50)) {
 		intel_gt_mcr_multicast_rmw(gt, XEHP_RING_FAULT_REG,
 					   RING_FAULT_VALID, 0);
 		intel_gt_mcr_read_any(gt, XEHP_RING_FAULT_REG);
+
 	} else if (GRAPHICS_VER(i915) >= 12) {
 		intel_uncore_rmw(uncore, GEN12_RING_FAULT_REG, RING_FAULT_VALID, 0);
 		intel_uncore_posting_read(uncore, GEN12_RING_FAULT_REG);
diff --git a/drivers/gpu/drm/i915/gt/intel_gt_regs.h b/drivers/gpu/drm/i915/gt/intel_gt_regs.h
index cca4bac8f8b0..eecd0a87a647 100644
--- a/drivers/gpu/drm/i915/gt/intel_gt_regs.h
+++ b/drivers/gpu/drm/i915/gt/intel_gt_regs.h
@@ -1084,6 +1084,7 @@
 
 #define GEN12_RING_FAULT_REG			_MMIO(0xcec4)
 #define XEHP_RING_FAULT_REG			MCR_REG(0xcec4)
+#define XELPMP_RING_FAULT_REG			_MMIO(0xcec4)
 #define   GEN8_RING_FAULT_ENGINE_ID(x)		(((x) >> 12) & 0x7)
 #define   RING_FAULT_GTTSEL_MASK		(1 << 11)
 #define   RING_FAULT_SRCID(x)			(((x) >> 3) & 0xff)
diff --git a/drivers/gpu/drm/i915/i915_gpu_error.c b/drivers/gpu/drm/i915/i915_gpu_error.c
index f4ebcfb70289..b4e31e59c799 100644
--- a/drivers/gpu/drm/i915/i915_gpu_error.c
+++ b/drivers/gpu/drm/i915/i915_gpu_error.c
@@ -1234,7 +1234,16 @@ static void engine_record_registers(struct intel_engine_coredump *ee)
 	if (GRAPHICS_VER(i915) >= 6) {
 		ee->rc_psmi = ENGINE_READ(engine, RING_PSMI_CTL);
 
-		if (GRAPHICS_VER_FULL(i915) >= IP_VER(12, 50))
+		/*
+		 * For the media GT, this ring fault register is not replicated,
+		 * so don't do multicast/replicated register read/write
+		 * operation on it.
+		 */
+		if (MEDIA_VER(i915) >= 13 && engine->gt->type == GT_MEDIA)
+			ee->fault_reg = intel_uncore_read(engine->uncore,
+							  XELPMP_RING_FAULT_REG);
+
+		else if (GRAPHICS_VER_FULL(i915) >= IP_VER(12, 50))
 			ee->fault_reg = intel_gt_mcr_read_any(engine->gt,
 							      XEHP_RING_FAULT_REG);
 		else if (GRAPHICS_VER(i915) >= 12)
-- 
2.41.0