[Intel-gfx] [PATCH v4 34/38] drm/i915: Scheduler state dump via debugfs

[John.C.Harrison at Intel.com]

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

Added a facility for triggering the scheduler state dump via a debugfs
entry.

v2: New patch in series.

For: VIZ-1587
Signed-off-by: John Harrison <John.C.Harrison at Intel.com>
---
 drivers/gpu/drm/i915/i915_debugfs.c   | 33 +++++++++++++++++++++++++++++++++
 drivers/gpu/drm/i915/i915_scheduler.c |  9 +++++----
 drivers/gpu/drm/i915/i915_scheduler.h |  6 ++++++
 3 files changed, 44 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index 1c4c6fe..a99f9c5 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -1285,6 +1285,38 @@ DEFINE_SIMPLE_ATTRIBUTE(i915_scheduler_file_queue_max_fops,
 			i915_scheduler_file_queue_max_set,
 			"%llu\n");
 
+static int
+i915_scheduler_dump_flags_get(void *data, u64 *val)
+{
+	struct drm_device       *dev       = data;
+	struct drm_i915_private *dev_priv  = dev->dev_private;
+	struct i915_scheduler   *scheduler = dev_priv->scheduler;
+
+	*val = scheduler->dump_flags;
+
+	return 0;
+}
+
+static int
+i915_scheduler_dump_flags_set(void *data, u64 val)
+{
+	struct drm_device       *dev       = data;
+	struct drm_i915_private *dev_priv  = dev->dev_private;
+	struct i915_scheduler   *scheduler = dev_priv->scheduler;
+
+	scheduler->dump_flags = lower_32_bits(val) & i915_sf_dump_mask;
+
+	if (val & 1)
+		i915_scheduler_dump_all(dev, "DebugFS");
+
+	return 0;
+}
+
+DEFINE_SIMPLE_ATTRIBUTE(i915_scheduler_dump_flags_fops,
+			i915_scheduler_dump_flags_get,
+			i915_scheduler_dump_flags_set,
+			"0x%llx\n");
+
 static int i915_frequency_info(struct seq_file *m, void *unused)
 {
 	struct drm_info_node *node = m->private;
@@ -5698,6 +5730,7 @@ static const struct i915_debugfs_files {
 	{"i915_scheduler_priority_preempt", &i915_scheduler_priority_preempt_fops},
 	{"i915_scheduler_min_flying", &i915_scheduler_min_flying_fops},
 	{"i915_scheduler_file_queue_max", &i915_scheduler_file_queue_max_fops},
+	{"i915_scheduler_dump_flags", &i915_scheduler_dump_flags_fops},
 	{"i915_display_crc_ctl", &i915_display_crc_ctl_fops},
 	{"i915_pri_wm_latency", &i915_pri_wm_latency_fops},
 	{"i915_spr_wm_latency", &i915_spr_wm_latency_fops},
diff --git a/drivers/gpu/drm/i915/i915_scheduler.c b/drivers/gpu/drm/i915/i915_scheduler.c
index 3edf856..8426927 100644
--- a/drivers/gpu/drm/i915/i915_scheduler.c
+++ b/drivers/gpu/drm/i915/i915_scheduler.c
@@ -195,6 +195,10 @@ int i915_scheduler_init(struct drm_device *dev)
 	scheduler->priority_level_preempt = 900;
 	scheduler->min_flying             = 2;
 	scheduler->file_queue_max         = 64;
+	scheduler->dump_flags             = i915_sf_dump_force   |
+					    i915_sf_dump_details |
+					    i915_sf_dump_seqno   |
+					    i915_sf_dump_dependencies;
 
 	dev_priv->scheduler = scheduler;
 
@@ -787,10 +791,7 @@ static int i915_scheduler_dump_all_locked(struct drm_device *dev,
 	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_seqno   |
-					      i915_sf_dump_dependencies;
+		scheduler->flags[ring->id] |= scheduler->dump_flags & i915_sf_dump_mask;
 		r = i915_scheduler_dump_locked(ring, msg);
 		if (ret == 0)
 			ret = r;
diff --git a/drivers/gpu/drm/i915/i915_scheduler.h b/drivers/gpu/drm/i915/i915_scheduler.h
index d7aa542..3d1484d 100644
--- a/drivers/gpu/drm/i915/i915_scheduler.h
+++ b/drivers/gpu/drm/i915/i915_scheduler.h
@@ -108,6 +108,7 @@ struct i915_scheduler {
 	int32_t             priority_level_preempt;
 	uint32_t            min_flying;
 	uint32_t            file_queue_max;
+	uint32_t            dump_flags;
 
 	/* Statistics: */
 	struct i915_scheduler_stats     stats[I915_NUM_RINGS];
@@ -124,6 +125,11 @@ enum {
 	i915_sf_dump_details        = (1 << 9),
 	i915_sf_dump_dependencies   = (1 << 10),
 	i915_sf_dump_seqno          = (1 << 11),
+
+	i915_sf_dump_mask           = i915_sf_dump_force        |
+				      i915_sf_dump_details      |
+				      i915_sf_dump_dependencies |
+				      i915_sf_dump_seqno,
 };
 const char *i915_scheduler_flag_str(uint32_t flags);
 
-- 
1.9.1