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drm/i915: Record the ringbuffer associated with the request 

The request tells us where to read the ringbuf from, so use that
information to simplify the error capture. If no request was active at
the time of the hang, the ring is idle and there is no information
inside the ring pertaining to the hang.

Note carefully that this will reduce the amount of information stored in
the error state - any ring without an active request will not be
recorded.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Dave Gordon <david.s.gordon@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1467616119-4093-8-git-send-email-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson 2016-07-04 08:08:38 +01:00
parent 7b4d3a16dd
commit ba6e041806
1 changed files with 8 additions and 20 deletions
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28
drivers/gpu/drm/i915/i915_gpu_error.c
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@ -1077,7 +1077,6 @@ static void i915_gem_record_rings(struct drm_i915_private *dev_priv,
for (i = 0; i < I915_NUM_ENGINES; i++) {
struct intel_engine_cs *engine = &dev_priv->engine[i];
struct intel_ringbuffer *rbuf;
error->ring[i].pid = -1;
@ -1092,6 +1091,7 @@ static void i915_gem_record_rings(struct drm_i915_private *dev_priv,
request = i915_gem_find_active_request(engine);
if (request) {
struct i915_address_space *vm;
struct intel_ringbuffer *rb;
vm = request->ctx && request->ctx->ppgtt ?
&request->ctx->ppgtt->base :
@ -1122,27 +1122,15 @@ static void i915_gem_record_rings(struct drm_i915_private *dev_priv,
}
rcu_read_unlock();
}
rb = request->ringbuf;
error->ring[i].cpu_ring_head = rb->head;
error->ring[i].cpu_ring_tail = rb->tail;
error->ring[i].ringbuffer =
i915_error_ggtt_object_create(dev_priv,
rb->obj);
}
if (i915.enable_execlists) {
/* TODO: This is only a small fix to keep basic error
* capture working, but we need to add more information
* for it to be useful (e.g. dump the context being
* executed).
*/
if (request)
rbuf = request->ctx->engine[engine->id].ringbuf;
else
rbuf = dev_priv->kernel_context->engine[engine->id].ringbuf;
} else
rbuf = engine->buffer;
error->ring[i].cpu_ring_head = rbuf->head;
error->ring[i].cpu_ring_tail = rbuf->tail;
error->ring[i].ringbuffer =
i915_error_ggtt_object_create(dev_priv, rbuf->obj);
error->ring[i].hws_page =
i915_error_ggtt_object_create(dev_priv,
engine->status_page.obj);