i915: Track progress inside of batchbuffers for determining wedgedness.

This avoids early termination for long-running commands.

Signed-off-by: Eric Anholt <eric@anholt.net>
Signed-off-by: Dave Airlie <airlied@redhat.com>

1 files changed, 10 insertions, 1 deletions

diff --git a/drivers/gpu/drm/i915/i915_dma.c b/drivers/gpu/drm/i915/i915_dma.c
index 27a1f78a7f1a..aa9e8da9f716 100644
--- a/drivers/gpu/drm/i915/i915_dma.c
+++ b/drivers/gpu/drm/i915/i915_dma.c
@@ -40,11 +40,15 @@ int i915_wait_ring(struct drm_device * dev, int n, const char *caller)
 {
         drm_i915_private_t *dev_priv = dev->dev_private;
         drm_i915_ring_buffer_t *ring = &(dev_priv->ring);
+        u32 acthd_reg = IS_I965G(dev) ? ACTHD_I965 : ACTHD;
+        u32 last_acthd = I915_READ(acthd_reg);
+        u32 acthd;
         u32 last_head = I915_READ(PRB0_HEAD) & HEAD_ADDR;
         int i;
 
-        for (i = 0; i < 10000; i++) {
+        for (i = 0; i < 100000; i++) {
                 ring->head = I915_READ(PRB0_HEAD) & HEAD_ADDR;
+                acthd = I915_READ(acthd_reg);
                 ring->space = ring->head - (ring->tail + 8);
                 if (ring->space < 0)
                         ring->space += ring->Size;
@@ -55,8 +59,13 @@ int i915_wait_ring(struct drm_device * dev, int n, const char *caller)
 
                 if (ring->head != last_head)
                         i = 0;
+                if (acthd != last_acthd)
+                        i = 0;
 
                 last_head = ring->head;
+                last_acthd = acthd;
+                msleep_interruptible(10);
+
         }
 
         return -EBUSY;