drm/i915: Record fence registers on error.
Having seen the effects of erroneous fencing on the batchbuffer, a
useful sanity check is to record the fence registers at the time of an
error.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index 1e8cd74..addb939 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -684,6 +684,9 @@
seq_printf(m, " INSTPM: 0x%08x\n", error->instpm);
seq_printf(m, " seqno: 0x%08x\n", error->seqno);
+ for (i = 0; i < 16; i++)
+ seq_printf(m, " fence[%d] = %08llx\n", i, error->fence[i]);
+
if (error->active_bo)
print_error_buffers(m, "Active",
error->active_bo,
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 22d6388..699e71a 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -166,6 +166,7 @@
u32 instdone1;
u32 seqno;
u64 bbaddr;
+ u64 fence[16];
struct timeval time;
struct drm_i915_error_object {
int page_count;
diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index 09ac3bb..de95c7b 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -581,6 +581,35 @@
return i;
}
+static void i915_gem_record_fences(struct drm_device *dev,
+ struct drm_i915_error_state *error)
+{
+ struct drm_i915_private *dev_priv = dev->dev_private;
+ int i;
+
+ /* Fences */
+ switch (INTEL_INFO(dev)->gen) {
+ case 6:
+ for (i = 0; i < 16; i++)
+ error->fence[i] = I915_READ64(FENCE_REG_SANDYBRIDGE_0 + (i * 8));
+ break;
+ case 5:
+ case 4:
+ for (i = 0; i < 16; i++)
+ error->fence[i] = I915_READ64(FENCE_REG_965_0 + (i * 8));
+ break;
+ case 3:
+ if (IS_I945G(dev) || IS_I945GM(dev) || IS_G33(dev))
+ for (i = 0; i < 8; i++)
+ error->fence[i+8] = I915_READ(FENCE_REG_945_8 + (i * 4));
+ case 2:
+ for (i = 0; i < 8; i++)
+ error->fence[i] = I915_READ(FENCE_REG_830_0 + (i * 4));
+ break;
+
+ }
+}
+
/**
* i915_capture_error_state - capture an error record for later analysis
* @dev: drm device
@@ -656,6 +685,7 @@
error->acthd = I915_READ(ACTHD);
error->bbaddr = 0;
}
+ i915_gem_record_fences(dev, error);
bbaddr = i915_ringbuffer_last_batch(dev, &dev_priv->render_ring);