[RFC 32/39] drm/i915: Added debug state dump facilities to scheduler

From: John.C.Harrison@Intel.com
To: Intel-GFX@Lists.FreeDesktop.Org
Subject: [RFC 32/39] drm/i915: Added debug state dump facilities to scheduler
Date: Fri, 17 Jul 2015 15:33:41 +0100	[thread overview]
Message-ID: <1437143628-6329-33-git-send-email-John.C.Harrison@Intel.com> (raw)
In-Reply-To: <1437143628-6329-1-git-send-email-John.C.Harrison@Intel.com>

From: John Harrison <John.C.Harrison@Intel.com>

When debugging batch buffer submission issues, it is useful to be able to see
what the current state of the scheduler is. This change adds functions for
decoding the internal scheduler state and reporting it.

Change-Id: I0634168e3f3465ff023f5a673165c90b07e535b6
For: VIZ-1587
Signed-off-by: John Harrison <John.C.Harrison@Intel.com>
---
 drivers/gpu/drm/i915/i915_scheduler.c | 276 ++++++++++++++++++++++++++++++++++
 drivers/gpu/drm/i915/i915_scheduler.h |  14 ++
 2 files changed, 290 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_scheduler.c b/drivers/gpu/drm/i915/i915_scheduler.c
index f0c99ad..e22f6b8 100644
--- a/drivers/gpu/drm/i915/i915_scheduler.c
+++ b/drivers/gpu/drm/i915/i915_scheduler.c
@@ -36,6 +36,9 @@ static int         i915_scheduler_submit_max_priority(struct intel_engine_cs *ri
 					       bool is_locked);
 static uint32_t    i915_scheduler_count_flying(struct i915_scheduler *scheduler,
 					       struct intel_engine_cs *ring);
+static int         i915_scheduler_dump_locked(struct intel_engine_cs *ring,
+					      const char *msg);
+static int         i915_scheduler_dump_all_locked(struct drm_device *dev, const char *msg);
 static void        i915_scheduler_priority_bump_clear(struct i915_scheduler *scheduler);
 static int         i915_scheduler_priority_bump(struct i915_scheduler *scheduler,
 						struct i915_scheduler_queue_entry *target,
@@ -53,6 +56,115 @@ bool i915_scheduler_is_enabled(struct drm_device *dev)
 	return dev_priv->scheduler != NULL;
 }
 
+const char *i915_qe_state_str(struct i915_scheduler_queue_entry *node)
+{
+	static char	str[50];
+	char		*ptr = str;
+
+	*(ptr++) = node->bumped ? 'B' : '-',
+
+	*ptr = 0;
+
+	return str;
+}
+
+char i915_scheduler_queue_status_chr(enum i915_scheduler_queue_status status)
+{
+	switch (status) {
+	case i915_sqs_none:
+	return 'N';
+
+	case i915_sqs_queued:
+	return 'Q';
+
+	case i915_sqs_popped:
+	return 'X';
+
+	case i915_sqs_flying:
+	return 'F';
+
+	case i915_sqs_complete:
+	return 'C';
+
+	case i915_sqs_dead:
+	return 'D';
+
+	default:
+	break;
+	}
+
+	return '?';
+}
+
+const char *i915_scheduler_queue_status_str(
+				enum i915_scheduler_queue_status status)
+{
+	static char	str[50];
+
+	switch (status) {
+	case i915_sqs_none:
+	return "None";
+
+	case i915_sqs_queued:
+	return "Queued";
+
+	case i915_sqs_popped:
+	return "Popped";
+
+	case i915_sqs_flying:
+	return "Flying";
+
+	case i915_sqs_complete:
+	return "Complete";
+
+	case i915_sqs_dead:
+	return "Dead";
+
+	default:
+	break;
+	}
+
+	sprintf(str, "[Unknown_%d!]", status);
+	return str;
+}
+
+const char *i915_scheduler_flag_str(uint32_t flags)
+{
+	static char     str[100];
+	char           *ptr = str;
+
+	*ptr = 0;
+
+#define TEST_FLAG(flag, msg)						\
+	do {								\
+		if (flags & (flag)) {					\
+			strcpy(ptr, msg);				\
+			ptr += strlen(ptr);				\
+			flags &= ~(flag);				\
+		}							\
+	} while (0)
+
+	TEST_FLAG(i915_sf_interrupts_enabled, "IntOn|");
+	TEST_FLAG(i915_sf_submitting,         "Submitting|");
+	TEST_FLAG(i915_sf_dump_force,         "DumpForce|");
+	TEST_FLAG(i915_sf_dump_details,       "DumpDetails|");
+	TEST_FLAG(i915_sf_dump_dependencies,  "DumpDeps|");
+
+#undef TEST_FLAG
+
+	if (flags) {
+		sprintf(ptr, "Unknown_0x%X!", flags);
+		ptr += strlen(ptr);
+	}
+
+	if (ptr == str)
+		strcpy(str, "-");
+	else
+		ptr[-1] = 0;
+
+	return str;
+};
+
 int i915_scheduler_init(struct drm_device *dev)
 {
 	struct drm_i915_private *dev_priv = dev->dev_private;
@@ -709,6 +821,170 @@ void i915_gem_scheduler_work_handler(struct work_struct *work)
 	mutex_unlock(&dev->struct_mutex);
 }
 
+int i915_scheduler_dump_all(struct drm_device *dev, const char *msg)
+{
+	struct drm_i915_private *dev_priv = dev->dev_private;
+	struct i915_scheduler   *scheduler = dev_priv->scheduler;
+	unsigned long   flags;
+	int             ret;
+
+	spin_lock_irqsave(&scheduler->lock, flags);
+	ret = i915_scheduler_dump_all_locked(dev, msg);
+	spin_unlock_irqrestore(&scheduler->lock, flags);
+
+	return ret;
+}
+
+static int i915_scheduler_dump_all_locked(struct drm_device *dev, const char *msg)
+{
+	struct drm_i915_private *dev_priv = dev->dev_private;
+	struct i915_scheduler   *scheduler = dev_priv->scheduler;
+	struct intel_engine_cs  *ring;
+	int                     i, r, ret = 0;
+
+	for_each_ring(ring, dev_priv, i) {
+		scheduler->flags[ring->id] |= i915_sf_dump_force   |
+					      i915_sf_dump_details |
+					      i915_sf_dump_dependencies;
+		r = i915_scheduler_dump_locked(ring, msg);
+		if (ret == 0)
+			ret = r;
+	}
+
+	return ret;
+}
+
+int i915_scheduler_dump(struct intel_engine_cs *ring, const char *msg)
+{
+	struct drm_i915_private *dev_priv = ring->dev->dev_private;
+	struct i915_scheduler   *scheduler = dev_priv->scheduler;
+	unsigned long   flags;
+	int             ret;
+
+	spin_lock_irqsave(&scheduler->lock, flags);
+	ret = i915_scheduler_dump_locked(ring, msg);
+	spin_unlock_irqrestore(&scheduler->lock, flags);
+
+	return ret;
+}
+
+static int i915_scheduler_dump_locked(struct intel_engine_cs *ring, const char *msg)
+{
+	struct drm_i915_private *dev_priv = ring->dev->dev_private;
+	struct i915_scheduler   *scheduler = dev_priv->scheduler;
+	struct i915_scheduler_queue_entry  *node;
+	int                 flying = 0, queued = 0, complete = 0, other = 0;
+	static int          old_flying = -1, old_queued = -1, old_complete = -1;
+	bool                b_dump;
+	char                brkt[2] = { '<', '>' };
+
+	if (!ring)
+		return -EINVAL;
+
+	list_for_each_entry(node, &scheduler->node_queue[ring->id], link) {
+		if (I915_SQS_IS_QUEUED(node))
+			queued++;
+		else if (I915_SQS_IS_FLYING(node))
+			flying++;
+		else if (I915_SQS_IS_COMPLETE(node))
+			complete++;
+		else
+			other++;
+	}
+
+	b_dump = (flying != old_flying) ||
+		 (queued != old_queued) ||
+		 (complete != old_complete);
+	if (scheduler->flags[ring->id] & i915_sf_dump_force) {
+		if (!b_dump) {
+			b_dump = true;
+			brkt[0] = '{';
+			brkt[1] = '}';
+		}
+
+		scheduler->flags[ring->id] &= ~i915_sf_dump_force;
+	}
+
+	if (b_dump) {
+		old_flying   = flying;
+		old_queued   = queued;
+		old_complete = complete;
+		DRM_DEBUG_DRIVER("<%s> Q:%02d, F:%02d, C:%02d, O:%02d, "
+				 "Flags = %s, Next = %d:%d %c%s%c\n",
+				 ring->name, queued, flying, complete, other,
+				 i915_scheduler_flag_str(scheduler->flags[ring->id]),
+				 dev_priv->request_uniq, dev_priv->next_seqno,
+				 brkt[0], msg, brkt[1]);
+	} else {
+		/*DRM_DEBUG_DRIVER("<%s> Q:%02d, F:%02d, C:%02d, O:%02d"
+				 ", Flags = %s, Next = %d:%d [%s]\n",
+				 ring->name,
+				 queued, flying, complete, other,
+				 i915_scheduler_flag_str(scheduler->flags[ring->id]),
+				 dev_priv->request_uniq, dev_priv->next_seqno, msg); */
+
+		return 0;
+	}
+
+	if (scheduler->flags[ring->id] & i915_sf_dump_details) {
+		int         i, deps;
+		uint32_t    count, counts[i915_sqs_MAX];
+
+		memset(counts, 0x00, sizeof(counts));
+
+		list_for_each_entry(node, &scheduler->node_queue[ring->id], link) {
+			if (node->status < i915_sqs_MAX) {
+				count = counts[node->status]++;
+			} else {
+				DRM_DEBUG_DRIVER("<%s>   Unknown status: %d!\n",
+						 ring->name, node->status);
+				count = -1;
+			}
+
+			deps = 0;
+			for (i = 0; i < node->num_deps; i++)
+				if (i915_scheduler_is_dependency_valid(node, i))
+					deps++;
+
+			DRM_DEBUG_DRIVER("<%s>   %c:%02d> index = %d, uniq = %d, seqno"
+					 " = %d/%s, deps = %d / %d, fence = %p/%d, %s [pri = "
+					 "%4d]\n", ring->name,
+					 i915_scheduler_queue_status_chr(node->status),
+					 count,
+					 node->scheduler_index,
+					 node->params.request->uniq,
+					 node->params.request->seqno,
+					 node->params.ring->name,
+					 deps, node->num_deps,
+					 node->params.fence_wait,
+					 node->params.fence_wait ? atomic_read(&node->params.fence_wait->status) : 0,
+					 i915_qe_state_str(node),
+					 node->priority);
+
+			if ((scheduler->flags[ring->id] & i915_sf_dump_dependencies)
+				== 0)
+				continue;
+
+			for (i = 0; i < node->num_deps; i++)
+				if (node->dep_list[i])
+					DRM_DEBUG_DRIVER("<%s>       |-%c:"
+						"%02d%c uniq = %d, seqno = %d/%s, %s [pri = %4d]\n",
+						ring->name,
+						i915_scheduler_queue_status_chr(node->dep_list[i]->status),
+						i,
+						i915_scheduler_is_dependency_valid(node, i)
+							? '>' : '#',
+						node->dep_list[i]->params.request->uniq,
+						node->dep_list[i]->params.request->seqno,
+						node->dep_list[i]->params.ring->name,
+						i915_qe_state_str(node->dep_list[i]),
+						node->dep_list[i]->priority);
+		}
+	}
+
+	return 0;
+}
+
 int i915_scheduler_flush_request(struct drm_i915_gem_request *req,
 				 bool is_locked)
 {
diff --git a/drivers/gpu/drm/i915/i915_scheduler.h b/drivers/gpu/drm/i915/i915_scheduler.h
index 301c567..3e6819d 100644
--- a/drivers/gpu/drm/i915/i915_scheduler.h
+++ b/drivers/gpu/drm/i915/i915_scheduler.h
@@ -41,6 +41,9 @@ enum i915_scheduler_queue_status {
 	/* Limit value for use with arrays/loops */
 	i915_sqs_MAX
 };
+char i915_scheduler_queue_status_chr(enum i915_scheduler_queue_status status);
+const char *i915_scheduler_queue_status_str(
+				enum i915_scheduler_queue_status status);
 
 #define I915_SQS_IS_QUEUED(node)	(((node)->status == i915_sqs_queued))
 #define I915_SQS_IS_FLYING(node)	(((node)->status == i915_sqs_flying))
@@ -75,6 +78,7 @@ struct i915_scheduler_queue_entry {
 	uint32_t                            scheduler_index;
 	uint32_t                            flags;
 };
+const char *i915_qe_state_str(struct i915_scheduler_queue_entry *node);
 
 struct i915_scheduler {
 	struct list_head    node_queue[I915_NUM_RINGS];
@@ -92,9 +96,16 @@ struct i915_scheduler {
 
 /* Flag bits for i915_scheduler::flags */
 enum {
+	/* Internal state */
 	i915_sf_interrupts_enabled  = (1 << 0),
 	i915_sf_submitting          = (1 << 1),
+
+	/* Dump/debug flags */
+	i915_sf_dump_force          = (1 << 8),
+	i915_sf_dump_details        = (1 << 9),
+	i915_sf_dump_dependencies   = (1 << 10),
 };
+const char *i915_scheduler_flag_str(uint32_t flags);
 
 /* Options for 'scheduler_override' module parameter: */
 enum {
@@ -119,6 +130,9 @@ struct drm_i915_gem_request *i915_scheduler_find_by_sync_value(struct intel_engi
 int         i915_scheduler_flush(struct intel_engine_cs *ring, bool is_locked);
 int         i915_scheduler_flush_request(struct drm_i915_gem_request *req,
 					 bool is_locked);
+int         i915_scheduler_dump(struct intel_engine_cs *ring,
+				const char *msg);
+int         i915_scheduler_dump_all(struct drm_device *dev, const char *msg);
 bool        i915_scheduler_is_request_tracked(struct drm_i915_gem_request *req,
 					      bool *completed, bool *busy);
 bool        i915_scheduler_file_queue_is_full(struct drm_file *file);
-- 
1.9.1

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