[RFC 3/5] drm/i915: Update client name on context create

[Tvrtko Ursulin <tursulin@ursulin.net>]

From: Tvrtko Ursulin <tvrtko.ursulin@intel.com>

Some clients have the DRM fd passed to them over a socket by the X server.

Grab the real client and pid when they create their first context and
update the exposed data for more useful enumeration.

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
---
 drivers/gpu/drm/i915/i915_drv.h         |  8 ++++++++
 drivers/gpu/drm/i915/i915_gem.c         |  4 ++--
 drivers/gpu/drm/i915/i915_gem_context.c | 15 +++++++++++++--
 3 files changed, 23 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 2133e67f5fbc..372d13cb2472 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -3418,6 +3418,14 @@ i915_gem_object_pin_to_display_plane(struct drm_i915_gem_object *obj,
 void i915_gem_object_unpin_from_display_plane(struct i915_vma *vma);
 int i915_gem_object_attach_phys(struct drm_i915_gem_object *obj,
 				int align);
+
+int
+i915_gem_add_client(struct drm_i915_private *i915,
+		struct drm_i915_file_private *file_priv,
+		struct task_struct *task,
+		unsigned int serial);
+void i915_gem_remove_client(struct drm_i915_file_private *file_priv);
+
 int i915_gem_open(struct drm_i915_private *i915, struct drm_file *file);
 void i915_gem_release(struct drm_device *dev, struct drm_file *file);
 
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 24607bce2efe..46ac7b3ca348 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -5631,7 +5631,7 @@ show_client_pid(struct device *kdev, struct device_attribute *attr, char *buf)
 	return snprintf(buf, PAGE_SIZE, "%u", file_priv->client_pid);
 }
 
-static int
+int
 i915_gem_add_client(struct drm_i915_private *i915,
 		struct drm_i915_file_private *file_priv,
 		struct task_struct *task,
@@ -5686,7 +5686,7 @@ i915_gem_add_client(struct drm_i915_private *i915,
 	return ret;
 }
 
-static void i915_gem_remove_client(struct drm_i915_file_private *file_priv)
+void i915_gem_remove_client(struct drm_i915_file_private *file_priv)
 {
 	sysfs_remove_file(file_priv->client_root,
 			  (struct attribute *)&file_priv->attr.pid);
diff --git a/drivers/gpu/drm/i915/i915_gem_context.c b/drivers/gpu/drm/i915/i915_gem_context.c
index 7c6a406fd309..710ccfa18714 100644
--- a/drivers/gpu/drm/i915/i915_gem_context.c
+++ b/drivers/gpu/drm/i915/i915_gem_context.c
@@ -645,6 +645,7 @@ static bool client_is_banned(struct drm_i915_file_private *file_priv)
 int i915_gem_context_create_ioctl(struct drm_device *dev, void *data,
 				  struct drm_file *file)
 {
+	unsigned int pid = pid_nr(get_task_pid(current, PIDTYPE_PID));
 	struct drm_i915_private *dev_priv = to_i915(dev);
 	struct drm_i915_gem_context_create *args = data;
 	struct drm_i915_file_private *file_priv = file->driver_priv;
@@ -659,8 +660,7 @@ int i915_gem_context_create_ioctl(struct drm_device *dev, void *data,
 
 	if (client_is_banned(file_priv)) {
 		DRM_DEBUG("client %s[%d] banned from creating ctx\n",
-			  current->comm,
-			  pid_nr(get_task_pid(current, PIDTYPE_PID)));
+			  current->comm, pid);
 
 		return -EIO;
 	}
@@ -669,6 +669,17 @@ int i915_gem_context_create_ioctl(struct drm_device *dev, void *data,
 	if (ret)
 		return ret;
 
+	if (file_priv->client_pid != pid) {
+		unsigned int id = file_priv->client_sysfs_id;
+
+		i915_gem_remove_client(file_priv);
+		ret = i915_gem_add_client(dev_priv, file_priv, current, id);
+		if (ret) {
+			mutex_unlock(&dev->struct_mutex);
+			return ret;
+		}
+	}
+
 	ctx = i915_gem_create_context(dev_priv, file_priv);
 	mutex_unlock(&dev->struct_mutex);
 	if (IS_ERR(ctx))
-- 
2.14.1

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