Re: [PATCH 11/27] drm/i915: Merge wait_for_timelines with retire_request

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On 25/09/2019 11:01, Chris Wilson wrote:
wait_for_timelines is essentially the same loop as retiring requests
(with an extra timeout), so merge the two into one routine.

v2: i915_retire_requests_timeout and keep VT'd w/a as !interruptible

Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
---
  drivers/gpu/drm/i915/gem/i915_gem_mman.c      |  4 +-
  drivers/gpu/drm/i915/gem/i915_gem_pm.c        |  4 +-
  .../drm/i915/gem/selftests/i915_gem_context.c |  2 +-
  drivers/gpu/drm/i915/i915_debugfs.c           |  4 +-
  drivers/gpu/drm/i915/i915_drv.h               |  3 +-
  drivers/gpu/drm/i915/i915_gem.c               | 67 ++-----------------
  drivers/gpu/drm/i915/i915_gem_evict.c         | 12 ++--
  drivers/gpu/drm/i915/i915_gem_gtt.c           |  4 +-
  drivers/gpu/drm/i915/i915_request.c           | 26 ++++++-
  drivers/gpu/drm/i915/i915_request.h           |  7 +-
  .../gpu/drm/i915/selftests/igt_flush_test.c   |  4 +-
  .../gpu/drm/i915/selftests/igt_live_test.c    |  4 +-
  .../gpu/drm/i915/selftests/mock_gem_device.c  |  2 +-
  13 files changed, 49 insertions(+), 94 deletions(-)

diff --git a/drivers/gpu/drm/i915/gem/i915_gem_mman.c b/drivers/gpu/drm/i915/gem/i915_gem_mman.c
index c44614895487..9cb59fe1a736 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_mman.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_mman.c
@@ -431,9 +431,7 @@ static int create_mmap_offset(struct drm_i915_gem_object *obj)
/* Attempt to reap some mmap space from dead objects */
  	do {
-		err = i915_gem_wait_for_idle(i915,
-					     I915_WAIT_INTERRUPTIBLE,
-					     MAX_SCHEDULE_TIMEOUT);
+		err = i915_gem_wait_for_idle(i915, MAX_SCHEDULE_TIMEOUT);
  		if (err)
  			break;
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_pm.c b/drivers/gpu/drm/i915/gem/i915_gem_pm.c
index c9c9e49391fa..04a9a27d659d 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_pm.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_pm.c
@@ -59,9 +59,7 @@ static bool switch_to_kernel_context_sync(struct intel_gt *gt)
  {
  	bool result = !intel_gt_is_wedged(gt);
- if (i915_gem_wait_for_idle(gt->i915,
-				   I915_WAIT_FOR_IDLE_BOOST,
-				   I915_GEM_IDLE_TIMEOUT) == -ETIME) {
+	if (i915_gem_wait_for_idle(gt->i915, I915_GEM_IDLE_TIMEOUT) == -ETIME) {
  		/* XXX hide warning from gem_eio */
  		if (i915_modparams.reset) {
  			dev_err(gt->i915->drm.dev,
diff --git a/drivers/gpu/drm/i915/gem/selftests/i915_gem_context.c b/drivers/gpu/drm/i915/gem/selftests/i915_gem_context.c
index 82f54e819eb0..b26f550f8430 100644
--- a/drivers/gpu/drm/i915/gem/selftests/i915_gem_context.c
+++ b/drivers/gpu/drm/i915/gem/selftests/i915_gem_context.c
@@ -923,7 +923,7 @@ __sseu_finish(const char *name,
if ((flags & TEST_IDLE) && ret == 0) {
  		ret = i915_gem_wait_for_idle(ce->engine->i915,
-					     0, MAX_SCHEDULE_TIMEOUT);
+					     MAX_SCHEDULE_TIMEOUT);
  		if (ret)
  			return ret;
diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index 7bbc9eda8ebe..033764326601 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -3632,9 +3632,7 @@ i915_drop_caches_set(void *data, u64 val)
  		i915_retire_requests(i915);
if (val & (DROP_IDLE | DROP_ACTIVE)) {
-		ret = i915_gem_wait_for_idle(i915,
-					     I915_WAIT_INTERRUPTIBLE,
-					     MAX_SCHEDULE_TIMEOUT);
+		ret = i915_gem_wait_for_idle(i915, MAX_SCHEDULE_TIMEOUT);
  		if (ret)
  			return ret;
  	}
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 3611fd5446f3..6e5d5e4ca91d 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -2328,8 +2328,7 @@ void i915_gem_driver_register(struct drm_i915_private *i915);
  void i915_gem_driver_unregister(struct drm_i915_private *i915);
  void i915_gem_driver_remove(struct drm_i915_private *dev_priv);
  void i915_gem_driver_release(struct drm_i915_private *dev_priv);
-int i915_gem_wait_for_idle(struct drm_i915_private *dev_priv,
-			   unsigned int flags, long timeout);
+int i915_gem_wait_for_idle(struct drm_i915_private *dev_priv, long timeout);
  void i915_gem_suspend(struct drm_i915_private *dev_priv);
  void i915_gem_suspend_late(struct drm_i915_private *dev_priv);
  void i915_gem_resume(struct drm_i915_private *dev_priv);
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 47c53bb9eb89..ab23944571fa 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -883,61 +883,7 @@ void i915_gem_runtime_suspend(struct drm_i915_private *i915)
  	}
  }
-static long
-wait_for_timelines(struct intel_gt *gt, unsigned int wait, long timeout)
-{
-	struct intel_gt_timelines *timelines = &gt->timelines;
-	struct intel_timeline *tl;
-	unsigned long flags;
-
-	spin_lock_irqsave(&timelines->lock, flags);
-	list_for_each_entry(tl, &timelines->active_list, link) {
-		struct dma_fence *fence;
-
-		fence = i915_active_fence_get(&tl->last_request);
-		if (!fence)
-			continue;
-
-		spin_unlock_irqrestore(&timelines->lock, flags);
-
-		if (!dma_fence_is_i915(fence)) {
-			timeout = dma_fence_wait_timeout(fence,
-							 flags & I915_WAIT_INTERRUPTIBLE,
-							 timeout);
-		} else {
-			struct i915_request *rq = to_request(fence);
-
-			/*
-			 * "Race-to-idle".
-			 *
-			 * Switching to the kernel context is often used as
-			 * a synchronous step prior to idling, e.g. in suspend
-			 * for flushing all current operations to memory before
-			 * sleeping. These we want to complete as quickly as
-			 * possible to avoid prolonged stalls, so allow the gpu
-			 * to boost to maximum clocks.
-			 */
-			if (flags & I915_WAIT_FOR_IDLE_BOOST)
-				gen6_rps_boost(rq);
-
-			timeout = i915_request_wait(rq, flags, timeout);
-		}
-
-		dma_fence_put(fence);
-		if (timeout < 0)
-			return timeout;
-
-		/* restart after reacquiring the lock */
-		spin_lock_irqsave(&timelines->lock, flags);
-		tl = list_entry(&timelines->active_list, typeof(*tl), link);
-	}
-	spin_unlock_irqrestore(&timelines->lock, flags);
-
-	return timeout;
-}
-
-int i915_gem_wait_for_idle(struct drm_i915_private *i915,
-			   unsigned int flags, long timeout)
+int i915_gem_wait_for_idle(struct drm_i915_private *i915, long timeout)
  {
  	struct intel_gt *gt = &i915->gt;
@@ -945,18 +891,13 @@ int i915_gem_wait_for_idle(struct drm_i915_private *i915,
  	if (!intel_gt_pm_is_awake(gt))
  		return 0;
- do {
-		timeout = wait_for_timelines(gt, flags, timeout);
-		if (timeout < 0)
-			return timeout;
-
+	while ((timeout = i915_retire_requests_timeout(i915, timeout)) > 0) {
  		cond_resched();
  		if (signal_pending(current))
  			return -EINTR;
+	}
- } while (i915_retire_requests(i915));
-
-	return 0;
+	return timeout;
  }
struct i915_vma *
diff --git a/drivers/gpu/drm/i915/i915_gem_evict.c b/drivers/gpu/drm/i915/i915_gem_evict.c
index 0552bf93eea3..0a412f6d01d7 100644
--- a/drivers/gpu/drm/i915/i915_gem_evict.c
+++ b/drivers/gpu/drm/i915/i915_gem_evict.c
@@ -46,9 +46,7 @@ static int ggtt_flush(struct drm_i915_private *i915)
  	 * the hopes that we can then remove contexts and the like only
  	 * bound by their active reference.
  	 */
-	return i915_gem_wait_for_idle(i915,
-				      I915_WAIT_INTERRUPTIBLE,
-				      MAX_SCHEDULE_TIMEOUT);
+	return i915_gem_wait_for_idle(i915, MAX_SCHEDULE_TIMEOUT);
  }
static bool
@@ -126,6 +124,8 @@ i915_gem_evict_something(struct i915_address_space *vm,
  				    min_size, alignment, color,
  				    start, end, mode);
+ i915_retire_requests(vm->i915);
+
  search_again:
  	active = NULL;
  	INIT_LIST_HEAD(&eviction_list);
@@ -264,13 +264,13 @@ int i915_gem_evict_for_node(struct i915_address_space *vm,
trace_i915_gem_evict_node(vm, target, flags); - /* Retire before we search the active list. Although we have
+	/*
+	 * Retire before we search the active list. Although we have
  	 * reasonable accuracy in our retirement lists, we may have
  	 * a stray pin (preventing eviction) that can only be resolved by
  	 * retiring.
  	 */
-	if (!(flags & PIN_NONBLOCK))
-		i915_retire_requests(vm->i915);
+	i915_retire_requests(vm->i915);
if (i915_vm_has_cache_coloring(vm)) {
  		/* Expand search to cover neighbouring guard pages (or lack!) */
diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c
index bf57c41fa1fb..30ee016ac2ba 100644
--- a/drivers/gpu/drm/i915/i915_gem_gtt.c
+++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
@@ -2528,7 +2528,9 @@ void i915_gem_gtt_finish_pages(struct drm_i915_gem_object *obj,
  	struct i915_ggtt *ggtt = &dev_priv->ggtt;
if (unlikely(ggtt->do_idle_maps)) {
-		if (i915_gem_wait_for_idle(dev_priv, 0, MAX_SCHEDULE_TIMEOUT)) {
+		/* XXX This does not prevent more requests being submitted! */
+		if (i915_retire_requests_timeout(dev_priv,
+						 -MAX_SCHEDULE_TIMEOUT)) {
  			DRM_ERROR("Failed to wait for idle; VT'd may hang.\n");
  			/* Wait a bit, in hopes it avoids the hang */
  			udelay(10);
diff --git a/drivers/gpu/drm/i915/i915_request.c b/drivers/gpu/drm/i915/i915_request.c
index 4ffe62a42186..52f7c4e5b644 100644
--- a/drivers/gpu/drm/i915/i915_request.c
+++ b/drivers/gpu/drm/i915/i915_request.c
@@ -1508,13 +1508,19 @@ long i915_request_wait(struct i915_request *rq,
  	return timeout;
  }
-bool i915_retire_requests(struct drm_i915_private *i915)
+long i915_retire_requests_timeout(struct drm_i915_private *i915, long timeout)
  {
  	struct intel_gt_timelines *timelines = &i915->gt.timelines;
  	struct intel_timeline *tl, *tn;
+	unsigned long active_count = 0;
  	unsigned long flags;
+	bool interruptible;
  	LIST_HEAD(free);
+ interruptible = true;
+	if (timeout < 0)
+		timeout = -timeout, interruptible = false;

Slightly uneasy about the negative trick but alternatives which came to mind of or-ing the negative bit or wrapper for passing in the (non-)interruptible(timeout) do not sound so hot either.

+
  	spin_lock_irqsave(&timelines->lock, flags);
  	list_for_each_entry_safe(tl, tn, &timelines->active_list, link) {
  		if (!mutex_trylock(&tl->mutex))
@@ -1525,13 +1531,27 @@ bool i915_retire_requests(struct drm_i915_private *i915)
  		tl->active_count++; /* pin the list element */
  		spin_unlock_irqrestore(&timelines->lock, flags);
+ if (timeout > 0) {
+			struct dma_fence *fence;
+
+			fence = i915_active_fence_get(&tl->last_request);
+			if (fence) {
+				timeout = dma_fence_wait_timeout(fence,
+								 interruptible,
+								 timeout);
+				dma_fence_put(fence);
+			}
+		}
+
  		retire_requests(tl);
spin_lock_irqsave(&timelines->lock, flags); /* Resume iteration after dropping lock */
  		list_safe_reset_next(tl, tn, link);
-		if (!--tl->active_count)
+		if (--tl->active_count)
+			active_count += !!rcu_access_pointer(tl->last_request.fence);
+		else
  			list_del(&tl->link);
mutex_unlock(&tl->mutex);
@@ -1547,7 +1567,7 @@ bool i915_retire_requests(struct drm_i915_private *i915)
  	list_for_each_entry_safe(tl, tn, &free, link)
  		__intel_timeline_free(&tl->kref);
- return !list_empty(&timelines->active_list);
+	return active_count ? timeout : 0;
  }
#if IS_ENABLED(CONFIG_DRM_I915_SELFTEST)
diff --git a/drivers/gpu/drm/i915/i915_request.h b/drivers/gpu/drm/i915/i915_request.h
index 621fb33cda30..256b0715180f 100644
--- a/drivers/gpu/drm/i915/i915_request.h
+++ b/drivers/gpu/drm/i915/i915_request.h
@@ -310,7 +310,6 @@ long i915_request_wait(struct i915_request *rq,
  #define I915_WAIT_INTERRUPTIBLE	BIT(0)
  #define I915_WAIT_PRIORITY	BIT(1) /* small priority bump for the request */
  #define I915_WAIT_ALL		BIT(2) /* used by i915_gem_object_wait() */
-#define I915_WAIT_FOR_IDLE_BOOST BIT(3)
static inline bool i915_request_signaled(const struct i915_request *rq)
  {
@@ -460,6 +459,10 @@ i915_request_active_timeline(struct i915_request *rq)
  					 lockdep_is_held(&rq->engine->active.lock));
  }
-bool i915_retire_requests(struct drm_i915_private *i915);
+long i915_retire_requests_timeout(struct drm_i915_private *i915, long timeout);
+static inline void i915_retire_requests(struct drm_i915_private *i915)
+{
+	i915_retire_requests_timeout(i915, 0);
+}
#endif /* I915_REQUEST_H */
diff --git a/drivers/gpu/drm/i915/selftests/igt_flush_test.c b/drivers/gpu/drm/i915/selftests/igt_flush_test.c
index 2a5fbe46ea9f..ed496bd6d84f 100644
--- a/drivers/gpu/drm/i915/selftests/igt_flush_test.c
+++ b/drivers/gpu/drm/i915/selftests/igt_flush_test.c
@@ -18,8 +18,7 @@ int igt_flush_test(struct drm_i915_private *i915)
cond_resched(); - i915_retire_requests(i915);
-	if (i915_gem_wait_for_idle(i915, 0, HZ / 5) == -ETIME) {
+	if (i915_gem_wait_for_idle(i915, HZ / 5) == -ETIME) {
  		pr_err("%pS timed out, cancelling all further testing.\n",
  		       __builtin_return_address(0));
@@ -30,7 +29,6 @@ int igt_flush_test(struct drm_i915_private *i915)
  		intel_gt_set_wedged(&i915->gt);
  		ret = -EIO;
  	}
-	i915_retire_requests(i915);
return ret;
  }
diff --git a/drivers/gpu/drm/i915/selftests/igt_live_test.c b/drivers/gpu/drm/i915/selftests/igt_live_test.c
index 04a6f88fdf64..eae90f97df6c 100644
--- a/drivers/gpu/drm/i915/selftests/igt_live_test.c
+++ b/drivers/gpu/drm/i915/selftests/igt_live_test.c
@@ -23,9 +23,7 @@ int igt_live_test_begin(struct igt_live_test *t,
  	t->func = func;
  	t->name = name;
- err = i915_gem_wait_for_idle(i915,
-				     I915_WAIT_INTERRUPTIBLE,
-				     MAX_SCHEDULE_TIMEOUT);
+	err = i915_gem_wait_for_idle(i915, MAX_SCHEDULE_TIMEOUT);
  	if (err) {
  		pr_err("%s(%s): failed to idle before, with err=%d!",
  		       func, name, err);
diff --git a/drivers/gpu/drm/i915/selftests/mock_gem_device.c b/drivers/gpu/drm/i915/selftests/mock_gem_device.c
index 91f6253939ad..87d34167bf89 100644
--- a/drivers/gpu/drm/i915/selftests/mock_gem_device.c
+++ b/drivers/gpu/drm/i915/selftests/mock_gem_device.c
@@ -44,7 +44,7 @@ void mock_device_flush(struct drm_i915_private *i915)
  	do {
  		for_each_engine(engine, i915, id)
  			mock_engine_flush(engine);
-	} while (i915_retire_requests(i915));
+	} while (i915_retire_requests_timeout(i915, MAX_SCHEDULE_TIMEOUT));
  }
static void mock_device_release(struct drm_device *dev)


Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>

Regards,

Tvrtko
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