Commit 4230cea8 authored by Tvrtko Ursulin's avatar Tvrtko Ursulin Committed by Christian König

drm: Track clients by tgid and not tid

Thread group id (aka pid from userspace point of view) is a more
interesting thing to show as an owner of a DRM fd, so track and show that
instead of the thread id.

In the next patch we will make the owner updated post file descriptor
handover, which will also be tgid based to avoid ping-pong when multiple
threads access the fd.
Signed-off-by: default avatarTvrtko Ursulin <tvrtko.ursulin@intel.com>
Reviewed-by: default avatarZack Rusin <zackr@vmware.com>
Reviewed-by: default avatarChristian König <christian.koenig@amd.com>
Signed-off-by: default avatarChristian König <christian.koenig@amd.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230314141904.1210824-2-tvrtko.ursulin@linux.intel.com
parent e2945e6c
......@@ -969,7 +969,7 @@ static int amdgpu_debugfs_gem_info_show(struct seq_file *m, void *unused)
* Therefore, we need to protect this ->comm access using RCU.
*/
rcu_read_lock();
task = pid_task(file->pid, PIDTYPE_PID);
task = pid_task(file->pid, PIDTYPE_TGID);
seq_printf(m, "pid %8d command %s:\n", pid_nr(file->pid),
task ? task->comm : "<unknown>");
rcu_read_unlock();
......
......@@ -80,7 +80,7 @@ static int drm_clients_info(struct seq_file *m, void *data)
seq_printf(m,
"%20s %5s %3s master a %5s %10s\n",
"command",
"pid",
"tgid",
"dev",
"uid",
"magic");
......@@ -94,7 +94,7 @@ static int drm_clients_info(struct seq_file *m, void *data)
bool is_current_master = drm_is_current_master(priv);
rcu_read_lock(); /* locks pid_task()->comm */
task = pid_task(priv->pid, PIDTYPE_PID);
task = pid_task(priv->pid, PIDTYPE_TGID);
uid = task ? __task_cred(task)->euid : GLOBAL_ROOT_UID;
seq_printf(m, "%20s %5d %3d %c %c %5d %10u\n",
task ? task->comm : "<unknown>",
......
......@@ -156,7 +156,7 @@ struct drm_file *drm_file_alloc(struct drm_minor *minor)
if (!file)
return ERR_PTR(-ENOMEM);
file->pid = get_pid(task_pid(current));
file->pid = get_pid(task_tgid(current));
file->minor = minor;
/* for compatibility root is always authenticated */
......
......@@ -241,7 +241,7 @@ static int vmw_debugfs_gem_info_show(struct seq_file *m, void *unused)
* Therefore, we need to protect this ->comm access using RCU.
*/
rcu_read_lock();
task = pid_task(file->pid, PIDTYPE_PID);
task = pid_task(file->pid, PIDTYPE_TGID);
seq_printf(m, "pid %8d command %s:\n", pid_nr(file->pid),
task ? task->comm : "<unknown>");
rcu_read_unlock();
......
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