[PATCH 09/10] drm/i915: print IVB/HSW display error interrupts

[Paulo Zanoni <przanoni@gmail.com>]

From: Paulo Zanoni <paulo.r.zanoni@intel.com>

If we get one of these messages it means we did something wrong, and
the first step to fix wrong things is to detect them and recognize
they exist.

For now, leave these messages as DRM_DEBUG_KMS. After we conclude that
a certain message should not be print since our code is correct, then
we can promote that specific message to DRM_ERROR.

Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
---
 drivers/gpu/drm/i915/i915_irq.c |   56 ++++++++++++++++++++++++++++++++++++++-
 drivers/gpu/drm/i915/i915_reg.h |   23 ++++++++++++++--
 2 files changed, 76 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index cc49a6d..2f17b54 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -697,6 +697,54 @@ static void cpt_irq_handler(struct drm_device *dev, u32 pch_iir)
 					 I915_READ(FDI_RX_IIR(pipe)));
 }
 
+static void ivb_err_int_handler(struct drm_device *dev)
+{
+	drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
+	u32 err_int = I915_READ(GEN7_ERR_INT);
+
+	if (err_int & ERR_INT_POISON)
+		DRM_DEBUG_KMS("Poison interrupt\n");
+	if (err_int & ERR_INT_INVALID_GTT_PTE)
+		DRM_DEBUG_KMS("Invalid GTT PTE\n");
+	if (err_int & ERR_INT_INVALID_PTE_DATA)
+		DRM_DEBUG_KMS("Invalid GTT PTE data\n");
+	if (err_int & ERR_INT_SPRITE_GTT_FAULT_C)
+		DRM_DEBUG_KMS("Sprite C GTT fault\n");
+	if (err_int & ERR_INT_PRIMARY_GTT_FAULT_C)
+		DRM_DEBUG_KMS("Primary place C GTT fault\n");
+	if (err_int & ERR_INT_CURSOR_GTT_FAULT_C)
+		DRM_DEBUG_KMS("Cursor C GTT fault\n");
+	if (err_int & ERR_INT_SPRITE_GTT_FAULT_B)
+		DRM_DEBUG_KMS("Sprite B GTT fault\n");
+	if (err_int & ERR_INT_PRIMARY_GTT_FAULT_B)
+		DRM_DEBUG_KMS("Primary place B GTT fault\n");
+	if (err_int & ERR_INT_CURSOR_GTT_FAULT_B)
+		DRM_DEBUG_KMS("Cursor B GTT fault\n");
+	if (err_int & ERR_INT_SPRITE_GTT_FAULT_A)
+		DRM_DEBUG_KMS("Sprite A GTT fault\n");
+	if (err_int & ERR_INT_PRIMARY_GTT_FAULT_A)
+		DRM_DEBUG_KMS("Primary place A GTT fault\n");
+	if (err_int & ERR_INT_CURSOR_GTT_FAULT_A)
+		DRM_DEBUG_KMS("Cursor A GTT fault\n");
+	if (err_int & ERR_INT_PIPE_CRR_ERROR_C)
+		DRM_DEBUG_KMS("Pipe C CRC error\n");
+	if (err_int & ERR_INT_PIPE_FIFO_UNDERRRUN_C)
+		DRM_DEBUG_KMS("Pipe C FIFO underrun\n");
+	if (err_int & ERR_INT_PIPE_CRR_ERROR_B)
+		DRM_DEBUG_KMS("Pipe B CRC error\n");
+	if (err_int & ERR_INT_PIPE_FIFO_UNDERRRUN_B)
+		DRM_DEBUG_KMS("Pipe B FIFO underrun\n");
+	if (err_int & ERR_INT_PIPE_CRR_ERROR_A)
+		DRM_DEBUG_KMS("Pipe A CRC error\n");
+	if (err_int & ERR_INT_PIPE_FIFO_UNDERRRUN_A)
+		DRM_DEBUG_KMS("Pipe A FIFO underrun\n");
+
+	if (IS_HASWELL(dev) && (err_int & ERR_INT_MMIO_UNCLAIMED))
+		DRM_DEBUG_KMS("MMIO cycle not claimed\n");
+
+	I915_WRITE(GEN7_ERR_INT, err_int);
+}
+
 static irqreturn_t ivybridge_irq_handler(int irq, void *arg)
 {
 	struct drm_device *dev = (struct drm_device *) arg;
@@ -720,6 +768,9 @@ static irqreturn_t ivybridge_irq_handler(int irq, void *arg)
 
 	de_iir = I915_READ(DEIIR);
 	if (de_iir) {
+		if (de_iir & DE_ERR_INT_IVB)
+			ivb_err_int_handler(dev);
+
 		if (de_iir & DE_AUX_CHANNEL_A_IVB)
 			dp_aux_irq_handler(dev);
 
@@ -1964,7 +2015,7 @@ static int ivybridge_irq_postinstall(struct drm_device *dev)
 		DE_PLANEC_FLIP_DONE_IVB |
 		DE_PLANEB_FLIP_DONE_IVB |
 		DE_PLANEA_FLIP_DONE_IVB |
-		DE_AUX_CHANNEL_A_IVB;
+		DE_AUX_CHANNEL_A_IVB | DE_ERR_INT_IVB;
 	u32 render_irqs;
 	u32 hotplug_mask;
 	u32 pch_irq_mask;
@@ -1972,6 +2023,7 @@ static int ivybridge_irq_postinstall(struct drm_device *dev)
 	dev_priv->irq_mask = ~display_mask;
 
 	/* should always can generate irq */
+	I915_WRITE(GEN7_ERR_INT, I915_READ(GEN7_ERR_INT));
 	I915_WRITE(DEIIR, I915_READ(DEIIR));
 	I915_WRITE(DEIMR, dev_priv->irq_mask);
 	I915_WRITE(DEIER,
@@ -2135,6 +2187,8 @@ static void ironlake_irq_uninstall(struct drm_device *dev)
 	I915_WRITE(DEIMR, 0xffffffff);
 	I915_WRITE(DEIER, 0x0);
 	I915_WRITE(DEIIR, I915_READ(DEIIR));
+	if (IS_GEN7(dev))
+		I915_WRITE(GEN7_ERR_INT, I915_READ(GEN7_ERR_INT));
 
 	I915_WRITE(GTIMR, 0xffffffff);
 	I915_WRITE(GTIER, 0x0);
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index f054554..e8ecdc4 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -511,7 +511,26 @@
 
 #define ERROR_GEN6	0x040a0
 #define GEN7_ERR_INT	0x44040
-#define   ERR_INT_MMIO_UNCLAIMED (1<<13)
+#define  ERR_INT_POISON			(1<<31)
+#define  ERR_INT_INVALID_GTT_PTE	(1<<29)
+#define  ERR_INT_INVALID_PTE_DATA	(1<<28)
+#define  ERR_INT_SPRITE_GTT_FAULT_C	(1<<23)
+#define  ERR_INT_PRIMARY_GTT_FAULT_C	(1<<22)
+#define  ERR_INT_CURSOR_GTT_FAULT_C	(1<<21)
+#define  ERR_INT_SPRITE_GTT_FAULT_B	(1<<20)
+#define  ERR_INT_PRIMARY_GTT_FAULT_B	(1<<19)
+#define  ERR_INT_CURSOR_GTT_FAULT_B	(1<<18)
+#define  ERR_INT_SPRITE_GTT_FAULT_A	(1<<17)
+#define  ERR_INT_PRIMARY_GTT_FAULT_A	(1<<16)
+#define  ERR_INT_CURSOR_GTT_FAULT_A	(1<<15)
+#define  ERR_INT_PIPE_CRR_ERROR_C	(1<<7)
+#define  ERR_INT_PIPE_FIFO_UNDERRRUN_C	(1<<6)
+#define  ERR_INT_PIPE_CRR_ERROR_B	(1<<4)
+#define  ERR_INT_PIPE_FIFO_UNDERRRUN_B	(1<<3)
+#define  ERR_INT_PIPE_CRR_ERROR_A	(1<<1)
+#define  ERR_INT_PIPE_FIFO_UNDERRRUN_A	(1<<0)
+/* Haswell only: */
+#define  ERR_INT_MMIO_UNCLAIMED		(1<<13)
 
 /* GM45+ chicken bits -- debug workaround bits that may be required
  * for various sorts of correct behavior.  The top 16 bits of each are
@@ -3374,7 +3393,7 @@
 #define DE_PIPEA_FIFO_UNDERRUN  (1 << 0)
 
 /* More Ivybridge lolz */
-#define DE_ERR_DEBUG_IVB		(1<<30)
+#define DE_ERR_INT_IVB			(1<<30)
 #define DE_GSE_IVB			(1<<29)
 #define DE_PCH_EVENT_IVB		(1<<28)
 #define DE_DP_A_HOTPLUG_IVB		(1<<27)
-- 
1.7.10.4