drm/i915: Hook in display GTT faults for ILK/SNB

Hook up display GTT fault interrupts for ILK/SNB.

Bspec: 8559
Reviewed-by: Vinod Govindapillai <vinod.govindapillai@intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20250217070047.953-6-ville.syrjala@linux.intel.com

Author: vsyrjala

drivers/gpu/drm/i915/display/intel_display_irq.c

@@ -844,6 +844,56 @@ static void cpt_irq_handler(struct drm_i915_private *dev_priv, u32 pch_iir)
 		cpt_serr_int_handler(dev_priv);
 }
 
+static u32 ilk_gtt_fault_pipe_fault_mask(enum pipe pipe)
+{
+	switch (pipe) {
+	case PIPE_A:
+		return GTT_FAULT_SPRITE_A_FAULT |
+			GTT_FAULT_PRIMARY_A_FAULT |
+			GTT_FAULT_CURSOR_A_FAULT;
+	case PIPE_B:
+		return GTT_FAULT_SPRITE_B_FAULT |
+			GTT_FAULT_PRIMARY_B_FAULT |
+			GTT_FAULT_CURSOR_B_FAULT;
+	default:
+		return 0;
+	}
+}
+
+static const struct pipe_fault_handler ilk_pipe_fault_handlers[] = {
+	{ .fault = GTT_FAULT_SPRITE_A_FAULT, .handle = handle_plane_fault, .plane_id = PLANE_SPRITE0, },
+	{ .fault = GTT_FAULT_SPRITE_B_FAULT, .handle = handle_plane_fault, .plane_id = PLANE_SPRITE0, },
+	{ .fault = GTT_FAULT_PRIMARY_A_FAULT, .handle = handle_plane_fault, .plane_id = PLANE_PRIMARY, },
+	{ .fault = GTT_FAULT_PRIMARY_B_FAULT, .handle = handle_plane_fault, .plane_id = PLANE_PRIMARY, },
+	{ .fault = GTT_FAULT_CURSOR_A_FAULT, .handle = handle_plane_fault, .plane_id = PLANE_CURSOR, },
+	{ .fault = GTT_FAULT_CURSOR_B_FAULT, .handle = handle_plane_fault, .plane_id = PLANE_CURSOR, },
+	{}
+};
+
+static void ilk_gtt_fault_irq_handler(struct intel_display *display)
+{
+	enum pipe pipe;
+	u32 gtt_fault;
+
+	gtt_fault = intel_de_read(display, ILK_GTT_FAULT);
+	intel_de_write(display, ILK_GTT_FAULT, gtt_fault);
+
+	if (gtt_fault & GTT_FAULT_INVALID_GTT_PTE)
+		drm_err_ratelimited(display->drm, "Invalid GTT PTE\n");
+
+	if (gtt_fault & GTT_FAULT_INVALID_PTE_DATA)
+		drm_err_ratelimited(display->drm, "Invalid PTE data\n");
+
+	for_each_pipe(display, pipe) {
+		u32 fault_errors;
+
+		fault_errors = gtt_fault & ilk_gtt_fault_pipe_fault_mask(pipe);
+		if (fault_errors)
+			intel_pipe_fault_irq_handler(display, ilk_pipe_fault_handlers,
+						     pipe, fault_errors);
+	}
+}
+
 void ilk_display_irq_handler(struct drm_i915_private *dev_priv, u32 de_iir)
 {
 	struct intel_display *display = &dev_priv->display;
@@ -862,6 +912,9 @@ void ilk_display_irq_handler(struct drm_i915_private *dev_priv, u32 de_iir)
 	if (de_iir & DE_POISON)
 		drm_err(&dev_priv->drm, "Poison interrupt\n");
 
+	if (de_iir & DE_GTT_FAULT)
+		ilk_gtt_fault_irq_handler(display);
+
 	for_each_pipe(dev_priv, pipe) {
 		if (de_iir & DE_PIPE_VBLANK(pipe))
 			intel_handle_vblank(dev_priv, pipe);
@@ -1988,7 +2041,8 @@ void ilk_de_irq_postinstall(struct drm_i915_private *i915)
 			      DE_PLANE_FLIP_DONE_IVB(PLANE_A) |
 			      DE_DP_A_HOTPLUG_IVB);
 	} else {
-		display_mask = (DE_MASTER_IRQ_CONTROL | DE_GSE | DE_PCH_EVENT |
+		display_mask = (DE_MASTER_IRQ_CONTROL | DE_GSE |
+				DE_PCH_EVENT | DE_GTT_FAULT |
 				DE_AUX_CHANNEL_A | DE_PIPEB_CRC_DONE |
 				DE_PIPEA_CRC_DONE | DE_POISON);
 		extra_mask = (DE_PIPEA_VBLANK | DE_PIPEB_VBLANK |

drivers/gpu/drm/i915/i915_reg.h

@@ -372,6 +372,16 @@
 #define GEN7_MEDIA_MAX_REQ_COUNT	_MMIO(0x4070)
 #define GEN7_GFX_MAX_REQ_COUNT		_MMIO(0x4074)
 
+#define ILK_GTT_FAULT	_MMIO(0x44040) /* ilk/snb */
+#define   GTT_FAULT_INVALID_GTT_PTE	(1 << 7)
+#define   GTT_FAULT_INVALID_PTE_DATA	(1 << 6)
+#define   GTT_FAULT_CURSOR_B_FAULT	(1 << 5)
+#define   GTT_FAULT_CURSOR_A_FAULT	(1 << 4)
+#define   GTT_FAULT_SPRITE_B_FAULT	(1 << 3)
+#define   GTT_FAULT_SPRITE_A_FAULT	(1 << 2)
+#define   GTT_FAULT_PRIMARY_B_FAULT	(1 << 1)
+#define   GTT_FAULT_PRIMARY_A_FAULT	(1 << 0)
+
 #define GEN7_ERR_INT	_MMIO(0x44040)
 #define   ERR_INT_POISON		(1 << 31)
 #define   ERR_INT_INVALID_GTT_PTE	(1 << 29)