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drm/i915: Add a tracepoint for using a semaphore 

So that we can find the callers who introduce a ring stall. A single
ring stall is not too unwelcome, the right issue becomes when they start
to interlock and prevent any concurrent work. That, however, is a little
tricker to detect with a mere tracepoint!

v2: Rebrand it as a ring event, rather than an object event.
v3: Include the seqno in the tracepoint for posterity or something.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Chris Wilson 2013-09-25 11:43:28 +01:00 committed by Daniel Vetter
parent f56383cb9f
commit b52b89da09
2 changed files with 27 additions and 0 deletions
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1
drivers/gpu/drm/i915/i915_gem.c
View File

@ -2625,6 +2625,7 @@ i915_gem_object_sync(struct drm_i915_gem_object *obj,
if (ret)
return ret;
trace_i915_gem_ring_sync_to(from, to, seqno);
ret = to->sync_to(to, from, seqno);
if (!ret)
/* We use last_read_seqno because sync_to()

26
drivers/gpu/drm/i915/i915_trace.h
View File

@ -248,6 +248,32 @@ TRACE_EVENT(i915_gem_evict_vm,
TP_printk("dev=%d, vm=%p", __entry->vm->dev->primary->index, __entry->vm)
);
TRACE_EVENT(i915_gem_ring_sync_to,
TP_PROTO(struct intel_ring_buffer *from,
struct intel_ring_buffer *to,
u32 seqno),
TP_ARGS(from, to, seqno),
TP_STRUCT__entry(
__field(u32, dev)
__field(u32, sync_from)
__field(u32, sync_to)
__field(u32, seqno)
),
TP_fast_assign(
__entry->dev = from->dev->primary->index;
__entry->sync_from = from->id;
__entry->sync_to = to->id;
__entry->seqno = seqno;
),
TP_printk("dev=%u, sync-from=%u, sync-to=%u, seqno=%u",
__entry->dev,
__entry->sync_from, __entry->sync_to,
__entry->seqno)
);
TRACE_EVENT(i915_gem_ring_dispatch,
TP_PROTO(struct intel_ring_buffer *ring, u32 seqno, u32 flags),
TP_ARGS(ring, seqno, flags),