[Intel-gfx] [PATCH 7/7] drm/i915/chv: Add non claimed mmio checking

[Mika Kuoppala]

Imre mentioned that chv might also have capability to
track unclaimed mmio accesses. And it has, so take it
into use.

Cc: Imre Deak <imre.deak at intel.com>
Cc: Ville Syrjälä <ville.syrjala at linux.intel.com>
Signed-off-by: Mika Kuoppala <mika.kuoppala at intel.com>
---
 drivers/gpu/drm/i915/i915_reg.h     |  4 ++++
 drivers/gpu/drm/i915/intel_uncore.c | 34 ++++++++++++++++++++++++++++++----
 2 files changed, 34 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 007ae83..24686ab 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -1711,6 +1711,10 @@ enum skl_disp_power_wells {
 #define FPGA_DBG		_MMIO(0x42300)
 #define   FPGA_DBG_RM_NOCLAIM	(1<<31)
 
+#define CLAIM_ER		_MMIO(0x182028)
+#define   CLAIM_ER_CLR		(1<<31)
+#define   CLAIM_ER_CTR_MASK	(0xffff)
+
 #define DERRMR		_MMIO(0x44050)
 /* Note that HBLANK events are reserved on bdw+ */
 #define   DERRMR_PIPEA_SCANLINE		(1<<0)
diff --git a/drivers/gpu/drm/i915/intel_uncore.c b/drivers/gpu/drm/i915/intel_uncore.c
index 02bad32..ea8fcd4 100644
--- a/drivers/gpu/drm/i915/intel_uncore.c
+++ b/drivers/gpu/drm/i915/intel_uncore.c
@@ -335,13 +335,10 @@ static void intel_uncore_ellc_detect(struct drm_device *dev)
 }
 
 static bool
-check_for_unclaimed_mmio(struct drm_i915_private *dev_priv)
+fpga_check_for_unclaimed_mmio(struct drm_i915_private *dev_priv)
 {
 	u32 dbg;
 
-	if (!HAS_FPGA_DBG_UNCLAIMED(dev_priv))
-		return false;
-
 	dbg = __raw_i915_read32(dev_priv, FPGA_DBG);
 	if (likely(!(dbg & FPGA_DBG_RM_NOCLAIM)))
 		return false;
@@ -354,6 +351,35 @@ check_for_unclaimed_mmio(struct drm_i915_private *dev_priv)
 	return true;
 }
 
+static bool
+chv_check_for_unclaimed_mmio(struct drm_i915_private *dev_priv)
+{
+	u32 cer;
+
+	cer = __raw_i915_read32(dev_priv, CLAIM_ER);
+	if (likely(!(cer & CLAIM_ER_CTR_MASK)))
+		return false;
+
+	__raw_i915_write32(dev_priv, CLAIM_ER, CLAIM_ER_CLR);
+
+	/* We want to clear it asap, so post */
+	__raw_i915_read32(dev_priv, CLAIM_ER);
+
+	return true;
+}
+
+static bool
+check_for_unclaimed_mmio(struct drm_i915_private *dev_priv)
+{
+	if (HAS_FPGA_DBG_UNCLAIMED(dev_priv))
+		return fpga_check_for_unclaimed_mmio(dev_priv);
+
+	if (IS_CHERRYVIEW(dev_priv))
+		return chv_check_for_unclaimed_mmio(dev_priv);
+
+	return false;
+}
+
 static void __intel_uncore_early_sanitize(struct drm_device *dev,
 					  bool restore_forcewake)
 {
-- 
2.5.0