[Intel-gfx] [PATCH 26/29] drm/i915: Add uniq id to request structure for debugging

[John.C.Harrison at Intel.com]

From: John Harrison <John.C.Harrison at Intel.com>

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 if the seqno value is late allocated as then the request has
nothing but its pointer to identify it for much of its life.

For: VIZ-4377
Signed-off-by: John Harrison <John.C.Harrison at Intel.com>
---
 drivers/gpu/drm/i915/i915_drv.h         |    4 ++++
 drivers/gpu/drm/i915/intel_lrc.c        |    2 ++
 drivers/gpu/drm/i915/intel_ringbuffer.c |    2 ++
 3 files changed, 8 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index c77cff1..1a3db6f 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -1714,6 +1714,8 @@ struct drm_i915_private {
 		void (*stop_ring)(struct intel_engine_cs *ring);
 	} gt;
 
+	uint32_t request_uniq;
+
 	/*
 	 * NOTE: This is the dri1/ums dungeon, don't add stuff here. Your patch
 	 * will be rejected. Instead look for a better place.
@@ -1955,6 +1957,8 @@ struct drm_i915_gem_request {
 
 	/** deferred free list for dereferencing from IRQ context */
 	struct list_head free_list;
+
+	uint32_t uniq;
 };
 
 void i915_gem_request_free(struct kref *req_ref);
diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c
index 02eeff5..edf1033 100644
--- a/drivers/gpu/drm/i915/intel_lrc.c
+++ b/drivers/gpu/drm/i915/intel_lrc.c
@@ -797,6 +797,7 @@ static int logical_ring_alloc_request(struct intel_engine_cs *ring,
 				      struct intel_context *ctx)
 {
 	struct drm_i915_gem_request *request;
+	struct drm_i915_private *dev_private = ring->dev->dev_private;
 	int ret;
 
 	if (ring->outstanding_lazy_request)
@@ -808,6 +809,7 @@ static int logical_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) {
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c
index 04c9572..7b5c8b8 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.c
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
@@ -2029,6 +2029,7 @@ 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;
@@ -2039,6 +2040,7 @@ 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) {
-- 
1.7.9.5