[PATCH v4 2/6] drm: use drm_file client_name in fdinfo

[Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@amd.com>]

Add an optional drm-client-name field to drm fdinfo's output.

Reviewed-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@igalia.com>
Signed-off-by: Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@amd.com>
---
 Documentation/gpu/drm-usage-stats.rst | 5 +++++
 drivers/gpu/drm/drm_file.c            | 5 +++++
 2 files changed, 10 insertions(+)

diff --git a/Documentation/gpu/drm-usage-stats.rst b/Documentation/gpu/drm-usage-stats.rst
index a80f95ca1b2f..566e122e6e60 100644
--- a/Documentation/gpu/drm-usage-stats.rst
+++ b/Documentation/gpu/drm-usage-stats.rst
@@ -73,6 +73,11 @@ scope of each device, in which case `drm-pdev` shall be present as well.
 Userspace should make sure to not double account any usage statistics by using
 the above described criteria in order to associate data to individual clients.
 
+- drm-client-name: <valstr>
+
+String optionally set by userspace using DRM_IOCTL_SET_CLIENT_NAME.
+
+
 Utilization
 ^^^^^^^^^^^
 
diff --git a/drivers/gpu/drm/drm_file.c b/drivers/gpu/drm/drm_file.c
index 64f5e15304e7..1c9e03477a24 100644
--- a/drivers/gpu/drm/drm_file.c
+++ b/drivers/gpu/drm/drm_file.c
@@ -955,6 +955,11 @@ void drm_show_fdinfo(struct seq_file *m, struct file *f)
 			   PCI_SLOT(pdev->devfn), PCI_FUNC(pdev->devfn));
 	}
 
+	mutex_lock(&file->client_name_lock);
+	if (file->client_name)
+		drm_printf(&p, "drm-client-name:\t%s\n", file->client_name);
+	mutex_unlock(&file->client_name_lock);
+
 	if (dev->driver->show_fdinfo)
 		dev->driver->show_fdinfo(&p, file);
 }
-- 
2.40.1