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drm: add drm_file_err function to add process info

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Add a drm helper function which appends the process information for
the drm_file over drm_err formatted output.

v5: change to macro from function (Christian Koenig)
    add helper functions for lock/unlock (Christian Koenig)

v6: remove __maybe_unused and make function inline (Jani Nikula)
    remove drm_print.h

v7: Use va_format and %pV to concatenate fmt and vargs (Jani Nikula)

v8: Code formatting and typos (Ursulin tvrtko)

Signed-off-by: Sunil Khatri <sunil.khatri@amd.com>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@igalia.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Sunil Khatri
2025-04-09 17:09:23 +05:30
committed by Alex Deucher
parent c38de9db74
commit fc3817fb49
2 changed files with 37 additions and 0 deletions
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34
drivers/gpu/drm/drm_file.c
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@@ -986,6 +986,40 @@ void drm_show_fdinfo(struct seq_file *m, struct file *f)
}
EXPORT_SYMBOL(drm_show_fdinfo);
/**
* drm_file_err - log process name, pid and client_name associated with a drm_file
* @file_priv: context of interest for process name and pid
* @fmt: printf() like format string
*
* Helper function for clients which needs to log process details such
* as name and pid etc along with user logs.
*/
void drm_file_err(struct drm_file *file_priv, const char *fmt, ...)
{
va_list args;
struct va_format vaf;
struct pid *pid;
struct task_struct *task;
struct drm_device *dev = file_priv->minor->dev;
va_start(args, fmt);
vaf.fmt = fmt;
vaf.va = &args;
mutex_lock(&file_priv->client_name_lock);
rcu_read_lock();
pid = rcu_dereference(file_priv->pid);
task = pid_task(pid, PIDTYPE_TGID);
drm_err(dev, "comm: %s pid: %d client: %s ... %pV", task ? task->comm : "Unset",
task ? task->pid : 0, file_priv->client_name ?: "Unset", &vaf);
va_end(args);
rcu_read_unlock();
mutex_unlock(&file_priv->client_name_lock);
}
EXPORT_SYMBOL(drm_file_err);
/**
* mock_drm_getfile - Create a new struct file for the drm device
* @minor: drm minor to wrap (e.g. #drm_device.primary)