[PATCH 14/15] drm/i915: capture_reg_state interrupt registers for Gen8

[Rodrigo Vivi <rodrigo.vivi@intel.com>]

From: Michel Thierry <michel.thierry@intel.com>

After unclaimed register detection was enabled for BDW, I started seeing
warnings while reading registers 0x4400c (DEIER) and 0x4401c (GTIER).

>From Gen8, DEIER has been split per display engine pipe, and GTIER has
been split in 4.

Signed-off-by: Michel Thierry <michel.thierry@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
---
 drivers/gpu/drm/i915/i915_drv.h       |  2 ++
 drivers/gpu/drm/i915/i915_gpu_error.c | 19 ++++++++++++++++++-
 2 files changed, 20 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 67e9da0..6622a53 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -314,6 +314,8 @@ struct drm_i915_error_state {
 	u32 eir;
 	u32 pgtbl_er;
 	u32 ier;
+	u32 pipe_ier[I915_MAX_PIPES]; /* gen8 */
+	u32 gt_ier[4]; /* gen8 */
 	u32 ccid;
 	u32 derrmr;
 	u32 forcewake;
diff --git a/drivers/gpu/drm/i915/i915_gpu_error.c b/drivers/gpu/drm/i915/i915_gpu_error.c
index 0b3f694..e7a4ae0 100644
--- a/drivers/gpu/drm/i915/i915_gpu_error.c
+++ b/drivers/gpu/drm/i915/i915_gpu_error.c
@@ -380,6 +380,16 @@ int i915_error_state_to_str(struct drm_i915_error_state_buf *m,
 	if (INTEL_INFO(dev)->gen == 7)
 		err_printf(m, "ERR_INT: 0x%08x\n", error->err_int);
 
+	if (INTEL_INFO(dev)->gen == 8) {
+		for (i = 0; i < ARRAY_SIZE(error->pipe_ier); i++)
+				err_printf(m, "PIPE_IER_%d: 0x%08x\n", i,
+					   error->pipe_ier[i]);
+
+		for (i = 0; i < ARRAY_SIZE(error->gt_ier); i++)
+				err_printf(m, "GT_IER_%d: 0x%08x\n", i,
+					   error->gt_ier[i]);
+	}
+
 	for (i = 0; i < ARRAY_SIZE(error->ring); i++) {
 		err_printf(m, "%s command stream:\n", ring_str(i));
 		i915_ring_error_state(m, dev, &error->ring[i]);
@@ -1091,6 +1101,7 @@ static void i915_capture_reg_state(struct drm_i915_private *dev_priv,
 				   struct drm_i915_error_state *error)
 {
 	struct drm_device *dev = dev_priv->dev;
+	int i, pipe;
 
 	/* General organization
 	 * 1. Registers specific to a single generation
@@ -1135,7 +1146,13 @@ static void i915_capture_reg_state(struct drm_i915_private *dev_priv,
 	if (HAS_HW_CONTEXTS(dev))
 		error->ccid = I915_READ(CCID);
 
-	if (HAS_PCH_SPLIT(dev))
+	if (IS_GEN8(dev)) {
+		for_each_pipe(pipe)
+			error->pipe_ier[pipe] =
+					I915_READ(GEN8_DE_PIPE_IER(pipe));
+		for (i = 0; i < 4; i++)
+			error->gt_ier[i] = I915_READ(GEN8_GT_IER(i));
+	} else if (HAS_PCH_SPLIT(dev))
 		error->ier = I915_READ(DEIER) | I915_READ(GTIER);
 	else {
 		if (IS_GEN2(dev))
-- 
1.9.3