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| author | Pierre-Eric Pelloux-Prayer <[email protected]> | 2024-10-03 12:43:09 +0000 |
|---|---|---|
| committer | Christian König <[email protected]> | 2024-10-08 08:00:30 +0000 |
| commit | 56c594d8df64e726e803652ee9f4ab08659d4574 (patch) | |
| tree | 23a653bd9dbff74cb140c8977429dcb4c1cbee65 /drivers/gpu/drm/drm_debugfs.c | |
| parent | drm/vc4: Use `vc4_perfmon_find()` (diff) | |
| download | kernel-56c594d8df64e726e803652ee9f4ab08659d4574.tar.gz kernel-56c594d8df64e726e803652ee9f4ab08659d4574.zip | |
drm: add DRM_SET_CLIENT_NAME ioctl
Giving the opportunity to userspace to associate a free-form
name with a drm_file struct is helpful for tracking and debugging.
This is similar to the existing DMA_BUF_SET_NAME ioctl.
Access to client_name is protected by a mutex, and the 'clients' debugfs
file has been updated to print it.
Userspace MR to use this ioctl:
https://gitlab.freedesktop.org/virgl/virglrenderer/-/merge_requests/1428
If the string passed by userspace contains chars that would mess up output
when it's going to be printed (in dmesg, fdinfo, etc), -EINVAL is returned.
A 0-length string is a valid use, and clears the existing name.
Reviewed-by: Tvrtko Ursulin <[email protected]>
Reviewed-by: Dmitry Osipenko <[email protected]>
Signed-off-by: Pierre-Eric Pelloux-Prayer <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]
Reviewed-by: Christian König <[email protected]>
Signed-off-by: Christian König <[email protected]>
Diffstat (limited to 'drivers/gpu/drm/drm_debugfs.c')
| -rw-r--r-- | drivers/gpu/drm/drm_debugfs.c | 14 |
1 files changed, 10 insertions, 4 deletions
diff --git a/drivers/gpu/drm/drm_debugfs.c b/drivers/gpu/drm/drm_debugfs.c index 6b239a24f1df..5c99322a4c6f 100644 --- a/drivers/gpu/drm/drm_debugfs.c +++ b/drivers/gpu/drm/drm_debugfs.c @@ -78,12 +78,14 @@ static int drm_clients_info(struct seq_file *m, void *data) kuid_t uid; seq_printf(m, - "%20s %5s %3s master a %5s %10s\n", + "%20s %5s %3s master a %5s %10s %*s\n", "command", "tgid", "dev", "uid", - "magic"); + "magic", + DRM_CLIENT_NAME_MAX_LEN, + "name"); /* dev->filelist is sorted youngest first, but we want to present * oldest first (i.e. kernel, servers, clients), so walk backwardss. @@ -94,19 +96,23 @@ static int drm_clients_info(struct seq_file *m, void *data) struct task_struct *task; struct pid *pid; + mutex_lock(&priv->client_name_lock); rcu_read_lock(); /* Locks priv->pid and pid_task()->comm! */ pid = rcu_dereference(priv->pid); task = pid_task(pid, PIDTYPE_TGID); uid = task ? __task_cred(task)->euid : GLOBAL_ROOT_UID; - seq_printf(m, "%20s %5d %3d %c %c %5d %10u\n", + seq_printf(m, "%20s %5d %3d %c %c %5d %10u %*s\n", task ? task->comm : "<unknown>", pid_vnr(pid), priv->minor->index, is_current_master ? 'y' : 'n', priv->authenticated ? 'y' : 'n', from_kuid_munged(seq_user_ns(m), uid), - priv->magic); + priv->magic, + DRM_CLIENT_NAME_MAX_LEN, + priv->client_name ? priv->client_name : "<unset>"); rcu_read_unlock(); + mutex_unlock(&priv->client_name_lock); } mutex_unlock(&dev->filelist_mutex); return 0; |