[RFC 3/4] drm/i915: Add a batch pool debugfs file

[bradley.d.volkin@intel.com]

From: Brad Volkin <bradley.d.volkin@intel.com>

It provides some useful information about the buffers in
the per-ring command parser batch pools.

Signed-off-by: Brad Volkin <bradley.d.volkin@intel.com>
---
 drivers/gpu/drm/i915/i915_debugfs.c | 48 +++++++++++++++++++++++++++++++++++++
 1 file changed, 48 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index 76c2572..a930313 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -564,6 +564,53 @@ static int i915_gem_pageflip_info(struct seq_file *m, void *data)
 	return 0;
 }
 
+static int i915_gem_batch_pool_info(struct seq_file *m, void *data)
+{
+	struct drm_info_node *node = m->private;
+	struct drm_device *dev = node->minor->dev;
+	struct drm_i915_private *dev_priv = dev->dev_private;
+	struct intel_engine_cs *ring;
+	struct drm_i915_gem_object *obj;
+	int count;
+	int ret, i;
+
+	ret = mutex_lock_interruptible(&dev->struct_mutex);
+	if (ret)
+		return ret;
+
+	for_each_ring(ring, dev_priv, i) {
+		count = 0;
+
+		seq_printf(m, "%s pool:\n", ring->name);
+
+		seq_puts(m, " active:\n");
+		list_for_each_entry(obj,
+				    &ring->batch_pool->active_list,
+				    batch_pool_list) {
+			seq_puts(m, "   ");
+			describe_obj(m, obj);
+			seq_putc(m, '\n');
+			count++;
+		}
+
+		seq_puts(m, " inactive:\n");
+		list_for_each_entry(obj,
+				    &ring->batch_pool->inactive_list,
+				    batch_pool_list) {
+			seq_puts(m, "   ");
+			describe_obj(m, obj);
+			seq_putc(m, '\n');
+			count++;
+		}
+
+		seq_printf(m, " total: %d\n", count);
+	}
+
+	mutex_unlock(&dev->struct_mutex);
+
+	return 0;
+}
+
 static int i915_gem_request_info(struct seq_file *m, void *data)
 {
 	struct drm_info_node *node = m->private;
@@ -3811,6 +3858,7 @@ static const struct drm_info_list i915_debugfs_list[] = {
 	{"i915_gem_hws_blt", i915_hws_info, 0, (void *)BCS},
 	{"i915_gem_hws_bsd", i915_hws_info, 0, (void *)VCS},
 	{"i915_gem_hws_vebox", i915_hws_info, 0, (void *)VECS},
+	{"i915_gem_batch_pool", i915_gem_batch_pool_info, 0},
 	{"i915_rstdby_delays", i915_rstdby_delays, 0},
 	{"i915_frequency_info", i915_frequency_info, 0},
 	{"i915_delayfreq_table", i915_delayfreq_table, 0},
-- 
1.8.3.2