[Intel-gfx] [PATCH 05/12] drm/i915/xehp: Check for faults on primary GAM

[Matt Roper]

On Xe_HP the fault registers are now in a multicast register range.
However as part of the GAM these registers follow special rules and we
need only read from the "primary" GAM's instance to get the information
we need.  So a single intel_gt_mcr_read_any() (which will automatically
steer to the primary GAM) is sufficient; we don't need to loop over each
instance of the MCR register.

Signed-off-by: Matt Roper <matthew.d.roper at intel.com>
---
 drivers/gpu/drm/i915/gt/intel_gt.c      | 40 ++++++++++++++++++++++++-
 drivers/gpu/drm/i915/gt/intel_gt_regs.h |  3 ++
 2 files changed, 42 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/gt/intel_gt.c b/drivers/gpu/drm/i915/gt/intel_gt.c
index 5ddae95d4886..1cb7dd40ec47 100644
--- a/drivers/gpu/drm/i915/gt/intel_gt.c
+++ b/drivers/gpu/drm/i915/gt/intel_gt.c
@@ -304,6 +304,42 @@ static void gen6_check_faults(struct intel_gt *gt)
 	}
 }
 
+static void xehp_check_faults(struct intel_gt *gt)
+{
+	u32 fault;
+
+	/*
+	 * Although the fault register now lives in an MCR register range,
+	 * the GAM registers are special and we only truly need to read
+	 * the "primary" GAM instance rather than handling each instance
+	 * individually.  intel_gt_mcr_read_any() will automatically steer
+	 * toward the primary instance.
+	 */
+	fault = intel_gt_mcr_read_any(gt, XEHP_RING_FAULT_REG);
+	if (fault & RING_FAULT_VALID) {
+		u32 fault_data0, fault_data1;
+		u64 fault_addr;
+
+		fault_data0 = intel_gt_mcr_read_any(gt, XEHP_FAULT_TLB_DATA0);
+		fault_data1 = intel_gt_mcr_read_any(gt, XEHP_FAULT_TLB_DATA1);
+
+		fault_addr = ((u64)(fault_data1 & FAULT_VA_HIGH_BITS) << 44) |
+			     ((u64)fault_data0 << 12);
+
+		drm_dbg(&gt->i915->drm, "Unexpected fault\n"
+			"\tAddr: 0x%08x_%08x\n"
+			"\tAddress space: %s\n"
+			"\tEngine ID: %d\n"
+			"\tSource ID: %d\n"
+			"\tType: %d\n",
+			upper_32_bits(fault_addr), lower_32_bits(fault_addr),
+			fault_data1 & FAULT_GTT_SEL ? "GGTT" : "PPGTT",
+			GEN8_RING_FAULT_ENGINE_ID(fault),
+			RING_FAULT_SRCID(fault),
+			RING_FAULT_FAULT_TYPE(fault));
+	}
+}
+
 static void gen8_check_faults(struct intel_gt *gt)
 {
 	struct intel_uncore *uncore = gt->uncore;
@@ -350,7 +386,9 @@ void intel_gt_check_and_clear_faults(struct intel_gt *gt)
 	struct drm_i915_private *i915 = gt->i915;
 
 	/* From GEN8 onwards we only have one 'All Engine Fault Register' */
-	if (GRAPHICS_VER(i915) >= 8)
+	if (GRAPHICS_VER_FULL(i915) >= IP_VER(12, 50))
+		xehp_check_faults(gt);
+	else if (GRAPHICS_VER(i915) >= 8)
 		gen8_check_faults(gt);
 	else if (GRAPHICS_VER(i915) >= 6)
 		gen6_check_faults(gt);
diff --git a/drivers/gpu/drm/i915/gt/intel_gt_regs.h b/drivers/gpu/drm/i915/gt/intel_gt_regs.h
index cf87a1b36a21..dff38b0c4430 100644
--- a/drivers/gpu/drm/i915/gt/intel_gt_regs.h
+++ b/drivers/gpu/drm/i915/gt/intel_gt_regs.h
@@ -1024,11 +1024,14 @@
 #define GEN9_BLT_MOCS(i)			_MMIO(__GEN9_BCS0_MOCS0 + (i) * 4)
 
 #define GEN12_FAULT_TLB_DATA0			_MMIO(0xceb8)
+#define XEHP_FAULT_TLB_DATA0			_MMIO(0xceb8)
 #define GEN12_FAULT_TLB_DATA1			_MMIO(0xcebc)
+#define XEHP_FAULT_TLB_DATA1			_MMIO(0xcebc)
 #define   FAULT_VA_HIGH_BITS			(0xf << 0)
 #define   FAULT_GTT_SEL				(1 << 4)
 
 #define GEN12_RING_FAULT_REG			_MMIO(0xcec4)
+#define XEHP_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)
-- 
2.37.3