From: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>
Include the signalers each request in the timeline is waiting on, as a
means to try and identify the cause of a stall. This can be quite
verbose, even as for now we only show each request in the timeline and
its immediate antecedents.
This generates output like:
Timeline 886: { count 1, ready: 0, inflight: 0, seqno: { current: 664, last: 666 }, engine: rcs0 }
U 886:29a- prio=0 @ 134ms: gem_exec_parall<4621>
- U bc1:27a- prio=0 @ 134ms: gem_exec_parall[4917]
Timeline 825: { count 1, ready: 0, inflight: 0, seqno: { current: 802, last: 804 }, engine: vcs0 }
U 825:324 prio=0 @ 107ms: gem_exec_parall<4518>
- U b75:140- prio=0 @ 110ms: gem_exec_parall<5486>
Timeline b46: { count 1, ready: 0, inflight: 0, seqno: { current: 782, last: 784 }, engine: vcs0 }
U b46:310- prio=0 @ 70ms: gem_exec_parall<5428>
- U c11:170- prio=0 @ 70ms: gem_exec_parall[5501]
Timeline 96b: { count 1, ready: 0, inflight: 0, seqno: { current: 632, last: 634 }, engine: vcs0 }
U 96b:27a- prio=0 @ 67ms: gem_exec_parall<4878>
- U b75:19e- prio=0 @ 67ms: gem_exec_parall<5486>
Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>
Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/i915/i915_debugfs.c | 3 ++-
drivers/gpu/drm/i915/i915_scheduler.c | 31 +++++++++++++++++++++++++++
drivers/gpu/drm/i915/i915_scheduler.h | 6 ++++++
3 files changed, 39 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index 354b95c438d0..263074c2c097 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -45,6 +45,7 @@
#include "i915_debugfs.h"
#include "i915_debugfs_params.h"
#include "i915_irq.h"
+#include "i915_scheduler.h"
#include "i915_trace.h"
#include "intel_pm.h"
#include "intel_sideband.h"
@@ -1323,7 +1324,7 @@ static int i915_engine_info(struct seq_file *m, void *unused)
for_each_uabi_engine(engine, i915)
intel_engine_dump(engine, &p, "%s\n", engine->name);
- intel_gt_show_timelines(&i915->gt, &p, NULL);
+ intel_gt_show_timelines(&i915->gt, &p, i915_request_show_with_schedule);
intel_runtime_pm_put(&i915->runtime_pm, wakeref);
diff --git a/drivers/gpu/drm/i915/i915_scheduler.c b/drivers/gpu/drm/i915/i915_scheduler.c
index cbb880b10c65..8837ba672933 100644
--- a/drivers/gpu/drm/i915/i915_scheduler.c
+++ b/drivers/gpu/drm/i915/i915_scheduler.c
@@ -504,6 +504,37 @@ void i915_sched_node_fini(struct i915_sched_node *node)
spin_unlock_irq(&schedule_lock);
}
+void i915_request_show_with_schedule(struct drm_printer *m,
+ const struct i915_request *rq,
+ const char *prefix)
+{
+ struct i915_dependency *dep;
+
+ i915_request_show(m, rq, prefix);
+ if (i915_request_completed(rq))
+ return;
+
+ rcu_read_lock();
+ for_each_signaler(dep, rq) {
+ const struct i915_request *signaler =
+ node_to_request(dep->signaler);
+
+ /* Dependencies along the same timeline are expected. */
+ if (signaler->timeline == rq->timeline)
+ continue;
+
+ if (i915_request_completed(signaler))
+ continue;
+
+ /* XXX ideally build indent into prefix */
+ i915_request_show(m, signaler,
+ i915_request_is_active(signaler) ? " - E" :
+ i915_request_is_ready(signaler) ? " - Q" :
+ " - U");
+ }
+ rcu_read_unlock();
+}
+
static void i915_global_scheduler_shrink(void)
{
kmem_cache_shrink(global.slab_dependencies);
diff --git a/drivers/gpu/drm/i915/i915_scheduler.h b/drivers/gpu/drm/i915/i915_scheduler.h
index 6f0bf00fc569..34cee9a17801 100644
--- a/drivers/gpu/drm/i915/i915_scheduler.h
+++ b/drivers/gpu/drm/i915/i915_scheduler.h
@@ -13,6 +13,8 @@
#include "i915_scheduler_types.h"
+struct drm_printer;
+
#define priolist_for_each_request(it, plist, idx) \
for (idx = 0; idx < ARRAY_SIZE((plist)->requests); idx++) \
list_for_each_entry(it, &(plist)->requests[idx], sched.link)
@@ -54,4 +56,8 @@ static inline void i915_priolist_free(struct i915_priolist *p)
__i915_priolist_free(p);
}
+void i915_request_show_with_schedule(struct drm_printer *m,
+ const struct i915_request *rq,
+ const char *prefix);
+
#endif /* _I915_SCHEDULER_H_ */
--
2.20.1
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