ERR_INT on HSW will display unclaimed MMIO accesses. This can be either
the result of a driver bug writing to an invalid addresses, or the
result of RC6.
Signed-off-by: Ben Widawsky <ben at bwidawsk.net>
---
drivers/gpu/drm/i915/i915_drv.c | 4 ++++
drivers/gpu/drm/i915/i915_reg.h | 1 +
2 files changed, 5 insertions(+)
diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
index 845e390..255087f 100644
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -1182,6 +1182,10 @@ void i915_write##x(struct drm_i915_private *dev_priv, u32 reg, u##x val) { \
if (unlikely(__fifo_ret)) { \
gen6_gt_check_fifodbg(dev_priv); \
} \
+ if (IS_HASWELL(dev_priv->dev) && (I915_READ_NOTRACE(GEN7_ERR_INT) & ERR_INT_MMIO_UNCLAIMED)) { \
+ DRM_ERROR("Unclaimed write to %x\n", reg); \
+ writel(ERR_INT_MMIO_UNCLAIMED, dev_priv->regs + GEN7_ERR_INT); \
+ } \
}
__i915_write(8, b)
__i915_write(16, w)
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index d4a7d73..bab4762 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -508,6 +508,7 @@
#define ERROR_GEN6 0x040a0
#define GEN7_ERR_INT 0x44040
+#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
--
1.7.11.5
