Only declare a missed interrupt if we find that the GPU is idle with
waiters and a hangcheck interval has passed in which no new user
interrupts have been raised.
v2: Clear the stuck interrupt marker between successful batches
Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Cc: Mika Kuoppala <mika.kuoppala@xxxxxxxxx>
Reviewed-by: Mika Kuoppala <mika.kuoppala@xxxxxxxxx>
---
drivers/gpu/drm/i915/i915_debugfs.c | 11 ++++++----
drivers/gpu/drm/i915/i915_irq.c | 38 ++++++++++++++++++++++-----------
drivers/gpu/drm/i915/intel_ringbuffer.h | 2 ++
3 files changed, 35 insertions(+), 16 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index 919c05ba9932..9640738aabf2 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -728,10 +728,10 @@ static int i915_gem_request_info(struct seq_file *m, void *data)
static void i915_ring_seqno_info(struct seq_file *m,
struct intel_engine_cs *engine)
{
- if (engine->get_seqno) {
- seq_printf(m, "Current sequence (%s): %x\n",
- engine->name, engine->get_seqno(engine));
- }
+ seq_printf(m, "Current sequence (%s): %x\n",
+ engine->name, engine->get_seqno(engine));
+ seq_printf(m, "Current user interrupts (%s): %x\n",
+ engine->name, READ_ONCE(engine->user_interrupts));
}
static int i915_gem_seqno_info(struct seq_file *m, void *data)
@@ -1367,6 +1367,9 @@ static int i915_hangcheck_info(struct seq_file *m, void *unused)
engine->hangcheck.seqno,
seqno[id],
engine->last_submitted_seqno);
+ seq_printf(m, "\tuser interrupts = %x [current %x]\n",
+ engine->hangcheck.user_interrupts,
+ READ_ONCE(engine->user_interrupts));
seq_printf(m, "\tACTHD = 0x%08llx [current 0x%08llx]\n",
(long long)engine->hangcheck.acthd,
(long long)acthd[id]);
diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index 3b946e1c7614..679f08c944ef 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -1000,6 +1000,7 @@ static void notify_ring(struct intel_engine_cs *engine)
return;
trace_i915_gem_request_notify(engine);
+ engine->user_interrupts++;
wake_up_all(&engine->irq_queue);
}
@@ -3054,6 +3055,24 @@ ring_stuck(struct intel_engine_cs *engine, u64 acthd)
return HANGCHECK_HUNG;
}
+static unsigned kick_waiters(struct intel_engine_cs *engine)
+{
+ struct drm_i915_private *i915 = to_i915(engine->dev);
+ unsigned user_interrupts = READ_ONCE(engine->user_interrupts);
+
+ if (engine->hangcheck.user_interrupts == user_interrupts &&
+ !test_and_set_bit(engine->id, &i915->gpu_error.missed_irq_rings)) {
+ if (!(i915->gpu_error.test_irq_rings & intel_engine_flag(engine)))
+ DRM_ERROR("Hangcheck timer elapsed... %s idle\n",
+ engine->name);
+ else
+ DRM_INFO("Fake missed irq on %s\n",
+ engine->name);
+ wake_up_all(&engine->irq_queue);
+ }
+
+ return user_interrupts;
+}
/*
* This is called when the chip hasn't reported back with completed
* batchbuffers in a long time. We keep track per ring seqno progress and
@@ -3096,6 +3115,7 @@ static void i915_hangcheck_elapsed(struct work_struct *work)
for_each_engine_id(engine, dev_priv, id) {
u64 acthd;
u32 seqno;
+ unsigned user_interrupts;
bool busy = true;
semaphore_clear_deadlocks(dev_priv);
@@ -3113,22 +3133,15 @@ static void i915_hangcheck_elapsed(struct work_struct *work)
acthd = intel_ring_get_active_head(engine);
seqno = engine->get_seqno(engine);
+ /* Reset stuck interrupts between batch advances */
+ user_interrupts = 0;
+
if (engine->hangcheck.seqno == seqno) {
if (ring_idle(engine, seqno)) {
engine->hangcheck.action = HANGCHECK_IDLE;
-
if (waitqueue_active(&engine->irq_queue)) {
- /* Issue a wake-up to catch stuck h/w. */
- if (!test_and_set_bit(engine->id, &dev_priv->gpu_error.missed_irq_rings)) {
- if (!(dev_priv->gpu_error.test_irq_rings & intel_engine_flag(engine)))
- DRM_ERROR("Hangcheck timer elapsed... %s idle\n",
- engine->name);
- else
- DRM_INFO("Fake missed irq on %s\n",
- engine->name);
- wake_up_all(&engine->irq_queue);
- }
/* Safeguard against driver failure */
+ user_interrupts = kick_waiters(engine);
engine->hangcheck.score += BUSY;
} else
busy = false;
@@ -3179,7 +3192,7 @@ static void i915_hangcheck_elapsed(struct work_struct *work)
engine->hangcheck.score = 0;
/* Clear head and subunit states on seqno movement */
- engine->hangcheck.acthd = 0;
+ acthd = 0;
memset(engine->hangcheck.instdone, 0,
sizeof(engine->hangcheck.instdone));
@@ -3187,6 +3200,7 @@ static void i915_hangcheck_elapsed(struct work_struct *work)
engine->hangcheck.seqno = seqno;
engine->hangcheck.acthd = acthd;
+ engine->hangcheck.user_interrupts = user_interrupts;
busy_count += busy;
}
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.h b/drivers/gpu/drm/i915/intel_ringbuffer.h
index 3f04906a081f..29c54cc1ee5c 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.h
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.h
@@ -87,6 +87,7 @@ enum intel_ring_hangcheck_action {
struct intel_ring_hangcheck {
u64 acthd;
u32 seqno;
+ unsigned user_interrupts;
int score;
enum intel_ring_hangcheck_action action;
int deadlock;
@@ -305,6 +306,7 @@ struct intel_engine_cs {
* inspecting request list.
*/
u32 last_submitted_seqno;
+ unsigned user_interrupts;
bool gpu_caches_dirty;
--
2.8.0.rc3
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