drm/i915: Record the in-flight requests at the time of a hang
Being able to tally the list of outstanding requests with the sequence
of commands in the ringbuffer is often useful evidence with respect to
driver corruption.
Note that since this is the umpteenth per-ring data structure to be added
to the error state, I've coallesced the nearby loops (the ringbuffer and
batchbuffer) into a single structure along with the list of requests. A
later task would be to refactor the ring register state into the same
structure.
v2: Fix pretty printing of requests so that they are parsed correctly by
intel_error_decode and use the 0x%08x format for seqno for consistency
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index bd6168b..85504fb1 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -788,11 +788,11 @@
{
int i;
- for (i = 0; i < ARRAY_SIZE(error->batchbuffer); i++)
- i915_error_object_free(error->batchbuffer[i]);
-
- for (i = 0; i < ARRAY_SIZE(error->ringbuffer); i++)
- i915_error_object_free(error->ringbuffer[i]);
+ for (i = 0; i < ARRAY_SIZE(error->ring); i++) {
+ i915_error_object_free(error->ring[i].batchbuffer);
+ i915_error_object_free(error->ring[i].ringbuffer);
+ kfree(error->ring[i].requests);
+ }
kfree(error->active_bo);
kfree(error->overlay);
@@ -934,6 +934,51 @@
error->cpu_ring_tail[ring->id] = ring->tail;
}
+static void i915_gem_record_rings(struct drm_device *dev,
+ struct drm_i915_error_state *error)
+{
+ struct drm_i915_private *dev_priv = dev->dev_private;
+ struct drm_i915_gem_request *request;
+ int i, count;
+
+ for (i = 0; i < I915_NUM_RINGS; i++) {
+ struct intel_ring_buffer *ring = &dev_priv->ring[i];
+
+ if (ring->obj == NULL)
+ continue;
+
+ i915_record_ring_state(dev, error, ring);
+
+ error->ring[i].batchbuffer =
+ i915_error_first_batchbuffer(dev_priv, ring);
+
+ error->ring[i].ringbuffer =
+ i915_error_object_create(dev_priv, ring->obj);
+
+ count = 0;
+ list_for_each_entry(request, &ring->request_list, list)
+ count++;
+
+ error->ring[i].num_requests = count;
+ error->ring[i].requests =
+ kmalloc(count*sizeof(struct drm_i915_error_request),
+ GFP_ATOMIC);
+ if (error->ring[i].requests == NULL) {
+ error->ring[i].num_requests = 0;
+ continue;
+ }
+
+ count = 0;
+ list_for_each_entry(request, &ring->request_list, list) {
+ struct drm_i915_error_request *erq;
+
+ erq = &error->ring[i].requests[count++];
+ erq->seqno = request->seqno;
+ erq->jiffies = request->emitted_jiffies;
+ }
+ }
+}
+
/**
* i915_capture_error_state - capture an error record for later analysis
* @dev: drm device
@@ -977,24 +1022,8 @@
error->done_reg = I915_READ(DONE_REG);
}
- i915_record_ring_state(dev, error, &dev_priv->ring[RCS]);
- if (HAS_BLT(dev))
- i915_record_ring_state(dev, error, &dev_priv->ring[BCS]);
- if (HAS_BSD(dev))
- i915_record_ring_state(dev, error, &dev_priv->ring[VCS]);
-
i915_gem_record_fences(dev, error);
-
- /* Record the active batch and ring buffers */
- for (i = 0; i < I915_NUM_RINGS; i++) {
- error->batchbuffer[i] =
- i915_error_first_batchbuffer(dev_priv,
- &dev_priv->ring[i]);
-
- error->ringbuffer[i] =
- i915_error_object_create(dev_priv,
- dev_priv->ring[i].obj);
- }
+ i915_gem_record_rings(dev, error);
/* Record buffers on the active and pinned lists. */
error->active_bo = NULL;