drm/i915: Add unique id to the request structure for debugging

For debugging purposes, it is useful to be able to uniquely identify a given
request structure as it works its way through the system. This becomes
especially tricky once the seqno value is lazily allocated as then the request
has nothing but its pointer to identify it for much of its life.

Change-Id: Ie76b2268b940467f4cdf5a4ba6f5a54cbb96445d
For: VIZ-4377
Signed-off-by: John Harrison <John.C.Harrison@Intel.com>
Reviewed-by: Thomas Daniel <Thomas.Daniel@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

1 files changed, 2 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c
index 882821913937..3887f1aaf057 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.c
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
@@ -2028,6 +2028,7 @@ intel_ring_alloc_request(struct intel_engine_cs *ring)
 {
         int ret;
         struct drm_i915_gem_request *request;
+        struct drm_i915_private *dev_private = ring->dev->dev_private;
 
         if (ring->outstanding_lazy_request)
                 return 0;
@@ -2038,6 +2039,7 @@ intel_ring_alloc_request(struct intel_engine_cs *ring)
 
         kref_init(&request->ref);
         request->ring = ring;
+        request->uniq = dev_private->request_uniq++;
 
         ret = i915_gem_get_seqno(ring->dev, &request->seqno);
         if (ret) {