[PATCH] drm: function to get process name and pid

[Khatri, Sunil]

[AMD Official Use Only - AMD Internal Distribution Only]

Sure, I will send the patch for the user too.

Regards
Sunil Khatri

-----Original Message-----
From: Koenig, Christian <Christian.Koenig at amd.com>
Sent: Friday, April 11, 2025 5:40 PM
To: Khatri, Sunil <Sunil.Khatri at amd.com>; dri-devel at lists.freedesktop.org; amd-gfx at lists.freedesktop.org
Cc: Deucher, Alexander <Alexander.Deucher at amd.com>
Subject: Re: [PATCH] drm: function to get process name and pid

Am 11.04.25 um 13:26 schrieb Sunil Khatri:
> Add helper function which get the process information for the drm_file
> and updates the user provided character buffer with the information of
> process name and pid as a string.

Hi Sunil,

you need to send this out together with the patch which makes use of the new function.

Regards,
Christian.

>
> Signed-off-by: Sunil Khatri <sunil.khatri at amd.com>
> ---
>  drivers/gpu/drm/drm_file.c | 30 ++++++++++++++++++++++++++++++
>  include/drm/drm_file.h     |  1 +
>  2 files changed, 31 insertions(+)
>
> diff --git a/drivers/gpu/drm/drm_file.c b/drivers/gpu/drm/drm_file.c
> index cb5f22f5bbb6..4434258d21b5 100644
> --- a/drivers/gpu/drm/drm_file.c
> +++ b/drivers/gpu/drm/drm_file.c
> @@ -965,6 +965,36 @@ void drm_show_fdinfo(struct seq_file *m, struct
> file *f)  }  EXPORT_SYMBOL(drm_show_fdinfo);
>
> +/**
> + * drm_process_info - Fill info string with process name and pid
> + * @file_priv: context of interest for process name and pid
> + * @proc_info: user char ptr to write the string to
> + * @buff_size: size of the buffer passed for the string
> + *
> + * This update the user provided buffer with process
> + * name and pid information for @file_priv  */ void
> +drm_process_info(struct drm_file *file_priv, char *proc_info, size_t
> +buff_size) {
> +     struct task_struct *task;
> +     struct pid *pid;
> +     struct drm_device *dev = file_priv->minor->dev;
> +
> +     if (!proc_info) {
> +             drm_err(dev, "Invalid user buffer\n");
> +             return;
> +     }
> +
> +     rcu_read_lock();
> +     pid = rcu_dereference(file_priv->pid);
> +     task = pid_task(pid, PIDTYPE_TGID);
> +     if (task)
> +             snprintf(proc_info, buff_size, "comm:%s pid:%d", task->comm,
> +task->pid);
> +
> +     rcu_read_unlock();
> +}
> +EXPORT_SYMBOL(drm_process_info);
> +
>  /**
>   * mock_drm_getfile - Create a new struct file for the drm device
>   * @minor: drm minor to wrap (e.g. #drm_device.primary) diff --git
> a/include/drm/drm_file.h b/include/drm/drm_file.h index
> f0ef32e9fa5e..c01b34936968 100644
> --- a/include/drm/drm_file.h
> +++ b/include/drm/drm_file.h
> @@ -501,6 +501,7 @@ void drm_print_memory_stats(struct drm_printer *p,
>
>  void drm_show_memory_stats(struct drm_printer *p, struct drm_file
> *file);  void drm_show_fdinfo(struct seq_file *m, struct file *f);
> +void drm_process_info(struct drm_file *file_priv, char *proc_info,
> +size_t buff_size);
>
>  struct file *mock_drm_getfile(struct drm_minor *minor, unsigned int
> flags);
>