[Intel-gfx] [RFC i-g-t 2/4] igt_aux: Add igt_set_autoresume_delay()

[Chris Wilson]

On Mon, Nov 07, 2016 at 07:05:14PM -0500, Lyude wrote:
> The default autoresume delay is about 5 seconds. It's possible on a
> system that's not very fast this might not be a long enough time, since
> an asynchronous hotplug event we scheduled on the chamelium that was
> intended to happen during suspend could happen before we actually manage
> to suspend. So, add a function that allows us to increase the autoresume
> time to ensure this never happens during suspend/resume tests with the
> chamelium.
> 
> Signed-off-by: Lyude <lyude at redhat.com>
> ---
>  lib/igt_aux.c | 46 ++++++++++++++++++++++++++++++++++++++++++++++
>  lib/igt_aux.h |  1 +
>  2 files changed, 47 insertions(+)
> 
> diff --git a/lib/igt_aux.c b/lib/igt_aux.c
> index 9754148..26d32fd 100644
> --- a/lib/igt_aux.c
> +++ b/lib/igt_aux.c
> @@ -812,6 +812,52 @@ void igt_system_suspend_autoresume(enum igt_suspend_state state,
>  	close(power_dir);
>  }
>  
> +static int original_autoresume_delay;
> +
> +static void igt_restore_autoresume_delay(int sig)
> +{
> +	int delay_fd;
> +	char delay_str[10];
> +
> +	igt_assert((delay_fd = open("/sys/module/suspend/parameters/pm_test_delay",
> +				    O_WRONLY)) >= 0);
> +
> +	snprintf(delay_str, sizeof(delay_str), "%d", original_autoresume_delay);
> +	igt_assert(write(delay_fd, delay_str, strlen(delay_str)));
> +
> +	close(delay_fd);
> +}
> +
> +/**
> + * igt_set_autoresume_delay:
> + * @delay_secs: The delay in seconds before resuming the system
> + *
> + * Sets how long we wait to resume the system after suspending it, using the
> + * suspend.pm_test_delay variable. On exit, the original delay value is
> + * restored.
> + */
> +void igt_set_autoresume_delay(int delay_secs)
> +{
> +	int delay_fd;
> +	char delay_str[10];
> +
> +	igt_skip_on_simulation();
> +
> +	igt_assert((delay_fd = open("/sys/module/suspend/parameters/pm_test_delay",
> +				    O_RDWR)) >= 0);

Are these test failures? No, then don't assert. Do it within your
igt_fixture() block and use igt_require to skip.
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre