[igt-dev] [PATCH i-g-t v4 2/2] lib/igt_aux: Enable PM Suspend dbg messages

[Dixit, Ashutosh]

On Mon, 26 Jun 2023 05:50:45 -0700, Anshuman Gupta wrote:
>

Hi Anshuman,

> Enabling PM Suspend dbg messages by turning on
> /sys/power/pm_debug_messages switch also adding an
> exit handler provision to restore the
> pm_debug_messages state.
>
> v2:
> - Fixed sysfs_fd leak. [Badal]
> v3:
> - Added igt_aux_enable_pm_suspend_dbg() function doc. [Kmail]
>
> Signed-off-by: Anshuman Gupta <anshuman.gupta at intel.com>
> Reviewed-by: Badal Nilawar <badal.nilawar at intel.com>
> ---
>  lib/igt_aux.c | 35 ++++++++++++++++++++++++++++-------
>  1 file changed, 28 insertions(+), 7 deletions(-)
>
> diff --git a/lib/igt_aux.c b/lib/igt_aux.c
> index 5eb6d9e270..35263b4519 100644
> --- a/lib/igt_aux.c
> +++ b/lib/igt_aux.c
> @@ -703,6 +703,7 @@ void igt_print_activity(void)
>
>  static int autoresume_delay;
>  bool __console_suspend_saved_state;
> +bool __pm_debug_messages_state;
>
>  #define SYSFS_MODULE_PRINTK "/sys/module/printk/parameters/"
>  #define CONSOLE_SUSPEND_DISABLE false
> @@ -913,7 +914,7 @@ static bool is_mem_sleep_state_supported(int power_dir, enum igt_mem_sleep state
>
>  static void igt_aux_pm_suspend_dbg_restore_exit_handler(int sig)
>  {
> -	int sysfs_fd;
> +	int sysfs_fd, power_dir;
>
>	sysfs_fd = open(SYSFS_MODULE_PRINTK, O_RDONLY);
>
> @@ -922,17 +923,30 @@ static void igt_aux_pm_suspend_dbg_restore_exit_handler(int sig)
>
>	igt_sysfs_set_boolean(sysfs_fd, "console_suspend", __console_suspend_saved_state);
>	close(sysfs_fd);

Maybe add an empty line here.

> +	power_dir = open("/sys/power", O_RDONLY);
> +

And delete this empty line.

> +	if (power_dir <  0)
> +		return;
> +
> +	if (!faccessat(power_dir, "pm_debug_messages", R_OK |  W_OK, 0))
> +		igt_sysfs_set_boolean(power_dir, "pm_debug_messages", __pm_debug_messages_state);
> +
> +	close(power_dir);
>  }
>
>  /**
>   * igt_aux_enable_pm_suspend_dbg:
> + * @power_dir: /sys/power/ dir fd
>   *
>   * Enhance the System wide suspend/resume debugging by,

No comma needed (it's from previous patch).

Apart from above nits, lgtm:

Reviewed-by: Ashutosh Dixit <ashutosh.dixit at intel.com>