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| author | Chris Wilson <chris@chris-wilson.co.uk> | 2014-09-02 11:03:22 +0400 |
|---|---|---|
| committer | Daniel Vetter <daniel.vetter@ffwll.ch> | 2014-09-15 10:56:29 +0400 |
| commit | 50d47cb318ed3bfdea4032111772be6f7a5cc7a2 (patch) | |
| tree | aa203018e02fccb96cf78b6b8241a78880c82f65 /drivers/gpu/drm/drm_info.c | |
| parent | 2a5706a36d1f7ecd563fdff0b363c9b909e727e2 (diff) | |
| download | linux-50d47cb318ed3bfdea4032111772be6f7a5cc7a2.tar.xz | |
drm: Include task->name and master status in debugfs clients info
Showing who is the current master is useful for trying to decypher
errors when trying to acquire master (e.g. a race with X taking over
from plymouth). By including the process name as well as the pid
simplifies the task of grabbing enough information remotely at the point
of error.
v2: Add the command column header and flesh out a couple of comments.
(David Herrmann)
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: David Herrmann <dh.herrmann@gmail.com>
Reviewed-by: David Herrmann <dh.herrmann@gmail.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Diffstat (limited to 'drivers/gpu/drm/drm_info.c')
| -rw-r--r-- | drivers/gpu/drm/drm_info.c | 27 |
1 files changed, 22 insertions, 5 deletions
diff --git a/drivers/gpu/drm/drm_info.c b/drivers/gpu/drm/drm_info.c index 3c99f6f60818..d1c5904bc473 100644 --- a/drivers/gpu/drm/drm_info.c +++ b/drivers/gpu/drm/drm_info.c @@ -183,15 +183,32 @@ int drm_clients_info(struct seq_file *m, void *data) struct drm_device *dev = node->minor->dev; struct drm_file *priv; + seq_printf(m, + "%20s %5s %3s master a %5s %10s\n", + "command", + "pid", + "dev", + "uid", + "magic"); + + /* dev->filelist is sorted youngest first, but we want to present + * oldest first (i.e. kernel, servers, clients), so walk backwardss. + */ mutex_lock(&dev->struct_mutex); - seq_printf(m, "a dev pid uid magic\n\n"); - list_for_each_entry(priv, &dev->filelist, lhead) { - seq_printf(m, "%c %3d %5d %5d %10u\n", - priv->authenticated ? 'y' : 'n', - priv->minor->index, + list_for_each_entry_reverse(priv, &dev->filelist, lhead) { + struct task_struct *task; + + rcu_read_lock(); /* locks pid_task()->comm */ + task = pid_task(priv->pid, PIDTYPE_PID); + seq_printf(m, "%20s %5d %3d %c %c %5d %10u\n", + task ? task->comm : "<unknown>", pid_vnr(priv->pid), + priv->minor->index, + priv->is_master ? 'y' : 'n', + priv->authenticated ? 'y' : 'n', from_kuid_munged(seq_user_ns(m), priv->uid), priv->magic); + rcu_read_unlock(); } mutex_unlock(&dev->struct_mutex); return 0; |