[PATCH 10/15] drm/i915: debugfs entry for i915 clients

[Ben Widawsky <ben@bwidawsk.net>]

$ cat /sys/kernel/debug/dri/0/i915_clients
PID   CMD
15869  X

Signed-off-by: Ben Widawsky <ben@bwidawsk.net>
---
 drivers/gpu/drm/i915/i915_debugfs.c |   28 ++++++++++++++++++++++++++++
 1 files changed, 28 insertions(+), 0 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index 261aa7c..59b9f22 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -1307,6 +1307,33 @@ static int i915_context_status(struct seq_file *m, void *unused)
 	return 0;
 }
 
+static int i915_clients(struct seq_file *m, void *unused)
+{
+	struct drm_info_node *node = (struct drm_info_node *) m->private;
+	struct drm_device *dev = node->minor->dev;
+	struct drm_i915_private *dev_priv = dev->dev_private;
+	struct drm_i915_file_private *temp;
+	int ret;
+
+	ret = mutex_lock_interruptible(&dev->struct_mutex);
+	if (ret)
+		return ret;
+
+	seq_printf(m, "PID   CMD\n");
+	list_for_each_entry(temp, &dev_priv->i915_client_list, client_link) {
+		struct pid *p;
+		struct task_struct *tsk;
+		pid_t pid = temp->drm_file->pid;
+		p = find_get_pid(pid);
+		tsk = get_pid_task(p, PIDTYPE_PID);
+		seq_printf(m, "%d  %s\n", pid, tsk->comm);
+		put_pid(p);
+	}
+
+	mutex_unlock(&dev->struct_mutex);
+	return 0;
+}
+
 static int i915_gen6_forcewake_count_info(struct seq_file *m, void *data)
 {
 	struct drm_info_node *node = (struct drm_info_node *) m->private;
@@ -1657,6 +1684,7 @@ static struct drm_info_list i915_debugfs_list[] = {
 	{"i915_gem_framebuffer", i915_gem_framebuffer_info, 0},
 	{"i915_context_status", i915_context_status, 0},
 	{"i915_gen6_forcewake_count", i915_gen6_forcewake_count_info, 0},
+	{"i915_clients", i915_clients, 0},
 };
 #define I915_DEBUGFS_ENTRIES ARRAY_SIZE(i915_debugfs_list)
 
-- 
1.7.7.3