[PATCH i-g-t] tests/intel/xe_pm: Add a check for power management capability

[Bernatowicz, Marcin]

On 3/6/2025 8:06 PM, Jakub Kolakowski wrote:
> Add a check for power management capability of device tested. Currently
> if test is started on configuration that does not support the PM
> capability it doesn't skip, instead depending on test it may fail, abort
> or timeout.
> With this change test will skip with a clear message why it did.
> 
> Cc: Adam Miszczak <adam.miszczak at linux.intel.com>
> Cc: Lukasz Laguna <lukasz.laguna at intel.com>
> Cc: Marcin Bernatowicz <marcin.bernatowicz at linux.intel.com>
> Signed-off-by: Jakub Kolakowski <jakub1.kolakowski at intel.com>
> ---
>   tests/intel/xe_pm.c | 9 +++++++++
>   1 file changed, 9 insertions(+)
> 
> diff --git a/tests/intel/xe_pm.c b/tests/intel/xe_pm.c
> index c2026474d..049596ebc 100644
> --- a/tests/intel/xe_pm.c
> +++ b/tests/intel/xe_pm.c
> @@ -17,6 +17,7 @@
>   
>   #include "igt.h"
>   #include "lib/igt_device.h"
> +#include "lib/igt_pci.h"
>   #include "lib/igt_pm.h"
>   #include "lib/igt_sysfs.h"
>   #include "lib/igt_syncobj.h"
> @@ -38,6 +39,8 @@
>   #define PREFETCH (0x1 << 1)
>   #define UNBIND_ALL (0x1 << 2)
>   
> +#define PCI_PM_CAP_ID 0x01
> +
>   enum mem_op {
>   	READ,
>   	WRITE,
> @@ -779,6 +782,7 @@ igt_main
>   	device_t device;
>   	uint32_t d3cold_allowed;
>   	int sysfs_fd;
> +	int offset;
>   
>   	const struct s_state {
>   		const char *name;
> @@ -812,6 +816,11 @@ igt_main
>   		device.fd_xe = drm_open_driver(DRIVER_XE);
>   		device.pci_xe = igt_device_get_pci_device(device.fd_xe);
>   		device.pci_root = igt_device_get_pci_root_port(device.fd_xe);
> +
> +		/* Make sure power management capability is present for device being tested */
> +		offset = find_pci_cap_offset(device.pci_root, PCI_PM_CAP_ID);
> +		igt_require_f(offset > 0, "PCI power management capability not found\n");
> +

Shouldn't this requirement apply only to D-states?

>   		igt_device_get_pci_slot_name(device.fd_xe, device.pci_slot_name);
>   
>   		/* Always perform initial once-basic exec checking for health */