[i-g-t] tests/intel: Add tests to run suspend without display

[Sundaresan, Sujaritha]

Hi all,

As a heads up to those reviewing the patch, the pre-merge testing for 
the added subtests is likely to fail due to a known sporadic issue with 
unloading and reloading the driver with no display.

Thanks,

Suja

On 2/22/2024 12:36 PM, Sujaritha Sundaresan wrote:
> Add tests to validate basic execution suspend/resume cycle
> without display module to rule out display related issues
> from the suspend/resume stack.
>
> Signed-off-by: Sujaritha Sundaresan <sujaritha.sundaresan at intel.com>
> ---
>   tests/intel/xe_pm.c | 22 ++++++++++++++++++++++
>   1 file changed, 22 insertions(+)
>
> diff --git a/tests/intel/xe_pm.c b/tests/intel/xe_pm.c
> index a0045da0b..e94835f0d 100644
> --- a/tests/intel/xe_pm.c
> +++ b/tests/intel/xe_pm.c
> @@ -16,6 +16,7 @@
>   
>   #include "igt.h"
>   #include "lib/igt_device.h"
> +#include "lib/igt_kmod.h"
>   #include "lib/igt_pm.h"
>   #include "lib/igt_sysfs.h"
>   #include "lib/igt_syncobj.h"
> @@ -236,6 +237,10 @@ static void close_fw_handle(int sig)
>    * Description: suspend/autoresume on %arg[1] state and exec after RPM
>    * Functionality: pm - %arg[1]
>    *
> + * SUBTEST: %s-without-display
> + * Description: suspend/autoresume on %arg[1] state without display
> + * Functionality: pm - %arg[1]
> + *
>    * arg[1]:
>    *
>    * @s2idle:	s2idle
> @@ -618,6 +623,23 @@ igt_main
>   					  NO_RPM);
>   		}
>   
> +		igt_subtest_f("%s-without-display", s->name) {
> +
> +			if (!drmModeGetResources(device.fd_xe))
> +				return;
> +
> +			xe_for_each_engine(device.fd_xe, hwe) {
> +				igt_kmsg(KMSG_INFO "Unloading Xe\n");
> +				igt_assert_eq(igt_xe_driver_unload(),0);
> +
> +				igt_kmsg(KMSG_INFO "Re-loading Xe without display\n");
> +				igt_assert_eq(igt_xe_driver_load("enable_display=0"),0);
> +
> +				test_exec(device, hwe, 1, 2, s->state,
> +					  NO_RPM);
> +			}
> +		}
> +
>   		for (const struct d_state *d = d_states; d->name; d++) {
>   			igt_subtest_f("%s-%s-basic-exec", s->name, d->name) {
>   				igt_assert(setup_d3(device, d->state));