[PATCH v3 14/16] drm/i915: refuse to submit more batchbuffers from guilty context

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If context has recently submitted a faulty batchbuffers guilty of
gpu hang and decides to keep submitting more crap, ban it permanently.

v2: Store guilty ban status bool in gpu_error instead of pointers
    that might become danling before hang is declared.

v3: Use return value for banned status instead of stashing state
    into gpu_error (Chris Wilson)

Signed-off-by: Mika Kuoppala <mika.kuoppala at intel.com>
---
 drivers/gpu/drm/i915/i915_drv.c            |    5 ++--
 drivers/gpu/drm/i915/i915_drv.h            |    8 ++++++-
 drivers/gpu/drm/i915/i915_gem.c            |   35 +++++++++++++++++++++-------
 drivers/gpu/drm/i915/i915_gem_execbuffer.c |   13 +++++++++++
 4 files changed, 49 insertions(+), 12 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
index 9ebe895..fe6f8d2 100644
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -883,16 +883,17 @@ int i915_reset(struct drm_device *dev)
 {
 	drm_i915_private_t *dev_priv = dev->dev_private;
 	int ret;
+	bool ctx_banned;
 
 	if (!i915_try_reset)
 		return 0;
 
 	mutex_lock(&dev->struct_mutex);
 
-	i915_gem_reset(dev);
+	ctx_banned = i915_gem_reset(dev);
 
 	ret = -ENODEV;
-	if (get_seconds() - dev_priv->gpu_error.last_reset < 5)
+	if (!ctx_banned && get_seconds() - dev_priv->gpu_error.last_reset < 5)
 		DRM_ERROR("GPU hanging too fast, declaring wedged!\n");
 	else
 		ret = intel_gpu_reset(dev);
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index d7fd16b..ecd979e 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -459,6 +459,12 @@ struct i915_ctx_hang_stats {
 
 	/* This context had batch active when hang was declared */
 	unsigned batch_active;
+
+	/* Time when this context was last blamed for a GPU reset */
+	unsigned long batch_active_reset_ts;
+
+	/* This context is banned to submit more work */
+	bool banned;
 };
 
 /* This must match up with the value previously used for execbuf2.rsvd1. */
@@ -1662,7 +1668,7 @@ static inline bool i915_terminally_wedged(struct i915_gpu_error *error)
 	return atomic_read(&error->reset_counter) == I915_WEDGED;
 }
 
-void i915_gem_reset(struct drm_device *dev);
+bool i915_gem_reset(struct drm_device *dev);
 void i915_gem_clflush_object(struct drm_i915_gem_object *obj);
 int __must_check i915_gem_object_set_domain(struct drm_i915_gem_object *obj,
 					    uint32_t read_domains,
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 0e87765..646bb7e 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -2143,15 +2143,15 @@ static bool i915_request_guilty(struct drm_i915_gem_request *request,
 	return false;
 }
 
-static void i915_set_reset_status(struct intel_ring_buffer *ring,
+static bool i915_set_reset_status(struct intel_ring_buffer *ring,
 				  struct drm_i915_gem_request *request,
 				  u32 acthd)
 {
 	struct i915_ctx_hang_stats *hs = NULL;
-	bool inside, guilty;
+	bool inside, guilty, banned;
 
 	/* Innocent until proven guilty */
-	guilty = false;
+	guilty = banned = false;
 
 	if (!ring->hangcheck.was_waiting &&
 	    i915_request_guilty(request, acthd, &inside)) {
@@ -2175,11 +2175,21 @@ static void i915_set_reset_status(struct intel_ring_buffer *ring,
 		hs = &request->file_priv->hang_stats;
 
 	if (hs) {
-		if (guilty)
+		if (guilty) {
+			if (!hs->banned &&
+			    get_seconds() - hs->batch_active_reset_ts < 5) {
+				hs->banned = banned = true;
+				DRM_ERROR("context hanging too fast, "
+					  "declaring banned\n");
+			}
 			hs->batch_active++;
-		else
+			hs->batch_active_reset_ts = get_seconds();
+		} else {
 			hs->batch_pending++;
+		}
 	}
+
+	return banned;
 }
 
 static void i915_gem_free_request(struct drm_i915_gem_request *request)
@@ -2193,11 +2203,12 @@ static void i915_gem_free_request(struct drm_i915_gem_request *request)
 	kfree(request);
 }
 
-static void i915_gem_reset_ring_lists(struct drm_i915_private *dev_priv,
+static bool i915_gem_reset_ring_lists(struct drm_i915_private *dev_priv,
 				      struct intel_ring_buffer *ring)
 {
 	u32 completed_seqno;
 	u32 acthd;
+	bool ctx_banned = false;
 
 	acthd = intel_ring_get_active_head(ring);
 	completed_seqno = ring->get_seqno(ring, false);
@@ -2210,7 +2221,8 @@ static void i915_gem_reset_ring_lists(struct drm_i915_private *dev_priv,
 					   list);
 
 		if (request->seqno > completed_seqno)
-			i915_set_reset_status(ring, request, acthd);
+			ctx_banned |= i915_set_reset_status(ring,
+							    request, acthd);
 
 		i915_gem_free_request(request);
 	}
@@ -2224,6 +2236,8 @@ static void i915_gem_reset_ring_lists(struct drm_i915_private *dev_priv,
 
 		i915_gem_object_move_to_inactive(obj);
 	}
+
+	return ctx_banned;
 }
 
 static void i915_gem_reset_fences(struct drm_device *dev)
@@ -2247,15 +2261,16 @@ static void i915_gem_reset_fences(struct drm_device *dev)
 	INIT_LIST_HEAD(&dev_priv->mm.fence_list);
 }
 
-void i915_gem_reset(struct drm_device *dev)
+bool i915_gem_reset(struct drm_device *dev)
 {
 	struct drm_i915_private *dev_priv = dev->dev_private;
 	struct drm_i915_gem_object *obj;
 	struct intel_ring_buffer *ring;
 	int i;
+	bool ctx_banned = false;
 
 	for_each_ring(ring, dev_priv, i)
-		i915_gem_reset_ring_lists(dev_priv, ring);
+		ctx_banned |= i915_gem_reset_ring_lists(dev_priv, ring);
 
 	/* Move everything out of the GPU domains to ensure we do any
 	 * necessary invalidation upon reuse.
@@ -2269,6 +2284,8 @@ void i915_gem_reset(struct drm_device *dev)
 
 	/* The fence registers are invalidated so clear them out */
 	i915_gem_reset_fences(dev);
+
+	return ctx_banned;
 }
 
 /**
diff --git a/drivers/gpu/drm/i915/i915_gem_execbuffer.c b/drivers/gpu/drm/i915/i915_gem_execbuffer.c
index bd1750a..f1b1ea9 100644
--- a/drivers/gpu/drm/i915/i915_gem_execbuffer.c
+++ b/drivers/gpu/drm/i915/i915_gem_execbuffer.c
@@ -844,6 +844,7 @@ i915_gem_do_execbuffer(struct drm_device *dev, void *data,
 	struct drm_clip_rect *cliprects = NULL;
 	struct intel_ring_buffer *ring;
 	struct i915_hw_context *ctx;
+	struct i915_ctx_hang_stats *hs;
 	u32 ctx_id = i915_execbuffer2_get_context_id(*args);
 	u32 exec_start, exec_len;
 	u32 mask, flags;
@@ -1026,6 +1027,18 @@ i915_gem_do_execbuffer(struct drm_device *dev, void *data,
 	if (ret)
 		goto err;
 
+	hs = i915_gem_context_get_hang_stats(&dev_priv->ring[RCS],
+					     file, ctx_id);
+	if (IS_ERR(hs)) {
+		ret = PTR_ERR(hs);
+		goto err;
+	}
+
+	if (hs->banned) {
+		ret = -EIO;
+		goto err;
+	}
+
 	ctx = i915_switch_context(ring, file, ctx_id);
 	if (IS_ERR(ctx)) {
 		ret = PTR_ERR(ctx);
-- 
1.7.9.5



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