diff mbox

[06/39] drm/i915: Re-instate request->uniq because it is extremely useful

Message ID 1448278774-31376-7-git-send-email-John.C.Harrison@Intel.com (mailing list archive)
State New, archived
Headers show

Commit Message

John Harrison Nov. 23, 2015, 11:39 a.m. UTC 
From: John Harrison <John.C.Harrison@Intel.com>

The seqno value cannot always be used when debugging issues via trace
points. This is because it can be reset back to start, especially
during TDR type tests. Also, when the scheduler arrives the seqno is
only valid while a given request is executing on the hardware. While
the request is simply queued waiting for submission, it's seqno value
will be zero (meaning invalid).

For: VIZ-5115
Signed-off-by: John Harrison <John.C.Harrison@Intel.com>
Reviewed-by: Tomas Elf <tomas.elf@intel.com>
---
 drivers/gpu/drm/i915/i915_drv.h   |  5 +++++
 drivers/gpu/drm/i915/i915_gem.c   |  3 ++-
 drivers/gpu/drm/i915/i915_trace.h | 25 +++++++++++++++++--------
 3 files changed, 24 insertions(+), 9 deletions(-)
diff mbox

Patch

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index eb00454..5d390d9 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -1963,6 +1963,8 @@  struct drm_i915_private {
 	/* perform PHY state sanity checks? */
 	bool chv_phy_assert[2];
 
+	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.
@@ -2210,6 +2212,9 @@  struct drm_i915_gem_request {
 	/** GEM sequence number associated with this request. */
 	uint32_t seqno;
 
+	/* Unique identifier which can be used for trace points & debug */
+	uint32_t uniq;
+
 	/** Position in the ringbuffer of the start of the request */
 	u32 head;
 
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 8ecc1f4..b23746a 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -2862,7 +2862,7 @@  static void i915_gem_request_fence_value_str(struct fence *req_fence, char *str,
 
 	req = container_of(req_fence, typeof(*req), fence);
 
-	snprintf(str, size, "%d [%d]", req->fence.seqno, req->seqno);
+	snprintf(str, size, "%d [%d:%d]", req->fence.seqno, req->uniq, req->seqno);
 }
 
 static const struct fence_ops i915_gem_request_fops = {
@@ -3015,6 +3015,7 @@  int i915_gem_request_alloc(struct intel_engine_cs *ring,
 
 	req->i915 = dev_priv;
 	req->ring = ring;
+	req->uniq = dev_priv->request_uniq++;
 	req->ctx  = ctx;
 	i915_gem_context_reference(req->ctx);
 
diff --git a/drivers/gpu/drm/i915/i915_trace.h b/drivers/gpu/drm/i915/i915_trace.h
index 41a026d..76b08fa 100644
--- a/drivers/gpu/drm/i915/i915_trace.h
+++ b/drivers/gpu/drm/i915/i915_trace.h
@@ -469,6 +469,7 @@  TRACE_EVENT(i915_gem_ring_sync_to,
 			     __field(u32, dev)
 			     __field(u32, sync_from)
 			     __field(u32, sync_to)
+			     __field(u32, uniq_to)
 			     __field(u32, seqno)
 			     ),
 
@@ -476,13 +477,14 @@  TRACE_EVENT(i915_gem_ring_sync_to,
 			   __entry->dev = from->dev->primary->index;
 			   __entry->sync_from = from->id;
 			   __entry->sync_to = to_req->ring->id;
+			   __entry->uniq_to = to_req->uniq;
 			   __entry->seqno = i915_gem_request_get_seqno(req);
 			   ),
 
-	    TP_printk("dev=%u, sync-from=%u, sync-to=%u, seqno=%u",
+	    TP_printk("dev=%u, sync-from=%u, sync-to=%u, seqno=%u, to_uniq=%u",
 		      __entry->dev,
 		      __entry->sync_from, __entry->sync_to,
-		      __entry->seqno)
+		      __entry->seqno, __entry->uniq_to)
 );
 
 TRACE_EVENT(i915_gem_ring_dispatch,
@@ -517,6 +519,7 @@  TRACE_EVENT(i915_gem_ring_flush,
 	    TP_STRUCT__entry(
 			     __field(u32, dev)
 			     __field(u32, ring)
+			     __field(u32, uniq)
 			     __field(u32, invalidate)
 			     __field(u32, flush)
 			     ),
@@ -524,12 +527,13 @@  TRACE_EVENT(i915_gem_ring_flush,
 	    TP_fast_assign(
 			   __entry->dev = req->ring->dev->primary->index;
 			   __entry->ring = req->ring->id;
+			   __entry->uniq = req->uniq;
 			   __entry->invalidate = invalidate;
 			   __entry->flush = flush;
 			   ),
 
-	    TP_printk("dev=%u, ring=%x, invalidate=%04x, flush=%04x",
-		      __entry->dev, __entry->ring,
+	    TP_printk("dev=%u, ring=%x, request=%u, invalidate=%04x, flush=%04x",
+		      __entry->dev, __entry->ring, __entry->uniq,
 		      __entry->invalidate, __entry->flush)
 );
 
@@ -540,6 +544,7 @@  DECLARE_EVENT_CLASS(i915_gem_request,
 	    TP_STRUCT__entry(
 			     __field(u32, dev)
 			     __field(u32, ring)
+			     __field(u32, uniq)
 			     __field(u32, seqno)
 			     ),
 
@@ -548,11 +553,13 @@  DECLARE_EVENT_CLASS(i915_gem_request,
 						i915_gem_request_get_ring(req);
 			   __entry->dev = ring->dev->primary->index;
 			   __entry->ring = ring->id;
+			   __entry->uniq = req ? req->uniq : 0;
 			   __entry->seqno = i915_gem_request_get_seqno(req);
 			   ),
 
-	    TP_printk("dev=%u, ring=%u, seqno=%u",
-		      __entry->dev, __entry->ring, __entry->seqno)
+	    TP_printk("dev=%u, ring=%u, uniq=%u, seqno=%u",
+		      __entry->dev, __entry->ring, __entry->uniq,
+		      __entry->seqno)
 );
 
 DEFINE_EVENT(i915_gem_request, i915_gem_request_add,
@@ -600,6 +607,7 @@  TRACE_EVENT(i915_gem_request_wait_begin,
 	    TP_STRUCT__entry(
 			     __field(u32, dev)
 			     __field(u32, ring)
+			     __field(u32, uniq)
 			     __field(u32, seqno)
 			     __field(bool, blocking)
 			     ),
@@ -615,13 +623,14 @@  TRACE_EVENT(i915_gem_request_wait_begin,
 						i915_gem_request_get_ring(req);
 			   __entry->dev = ring->dev->primary->index;
 			   __entry->ring = ring->id;
+			   __entry->uniq = req ? req->uniq : 0;
 			   __entry->seqno = i915_gem_request_get_seqno(req);
 			   __entry->blocking =
 				     mutex_is_locked(&ring->dev->struct_mutex);
 			   ),
 
-	    TP_printk("dev=%u, ring=%u, seqno=%u, blocking=%s",
-		      __entry->dev, __entry->ring,
+	    TP_printk("dev=%u, ring=%u, uniq=%u, seqno=%u, blocking=%s",
+		      __entry->dev, __entry->ring, __entry->uniq,
 		      __entry->seqno, __entry->blocking ?  "yes (NB)" : "no")
 );