[PATCH i-g-t v3] Do not require QUERY_OA_UNITS for all Xe tests

[Dixit, Ashutosh]

On Sun, 28 Jul 2024 22:25:39 -0700, Peter Senna Tschudin wrote:
>
> Changes xe_query_oa_units_new() to return NULL instead of aborting
> due to assertion failure when querying for DRM_XE_DEVICE_QUERY_OA_UNITS.
>
> It adds a skip to xe_oa.c to make sure it will not try to run the tests if the
> query has failed before.
>
> The motivation is as follows:
>  - The only test that requires oa_units is tests/intel/xe_oa.c, however current
>    code will prevent all Xe tests from running if OA_UNITS is not supported
>  - Before this patch, trying to run IGT on the Xe module from Fedora 40
>    (6.9.9-200.fc40.x86_64) fails
>  - After this patch, we can run some tests, such as xe_exec_basic
>    successfully
>
> Here is an example of the impact of this patch:
>  1. Use Fedora 40 with the following kernel command line arguments:
>     "xe.force_probe=* i915.force_probe=!* modprobe.blacklist=i915,ast,snd_hda_intel,xe"
>
>  2. Running IGT without this patch will fail:
>      $ sudo ./build/tests/xe_exec_basic
>      $ echo $?
>      98
>
>  3. Running after fix applied will succeed:
>     sudo ./build/tests/xe_exec_basic
>      $ sudo ./build/tests/xe_exec_basic
>      $ echo $?
>      0
>
> V3:
>  - Update comment syntax and shorten comments
>  - Update comment content to describe from kernel version perspective only
>  - Update test to make '!= 0' implicit

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

> V2:
>  - Cleanup headers from message body
>  - Add 'lib/xe/xe_query:' to subject line
>
> Signed-off-by: Peter Senna Tschudin <peter.senna at intel.com>
> ---
>  lib/xe/xe_query.c   | 4 +++-
>  tests/intel/xe_oa.c | 6 +++++-
>  2 files changed, 8 insertions(+), 2 deletions(-)
>
> diff --git a/lib/xe/xe_query.c b/lib/xe/xe_query.c
> index 84eaaac96..8694fa3f9 100644
> --- a/lib/xe/xe_query.c
> +++ b/lib/xe/xe_query.c
> @@ -124,7 +124,9 @@ static struct drm_xe_query_oa_units *xe_query_oa_units_new(int fd)
>		.data = 0,
>	};
>
> -	igt_assert_eq(igt_ioctl(fd, DRM_IOCTL_XE_DEVICE_QUERY, &query), 0);
> +	/* Support older kernels where this uapi is not yet available */
> +	if (igt_ioctl(fd, DRM_IOCTL_XE_DEVICE_QUERY, &query))
> +		return NULL;
>
>	oa_units = malloc(query.size);
>	igt_assert(oa_units);
> diff --git a/tests/intel/xe_oa.c b/tests/intel/xe_oa.c
> index ff2218300..1f82dce06 100644
> --- a/tests/intel/xe_oa.c
> +++ b/tests/intel/xe_oa.c
> @@ -4503,6 +4503,7 @@ static const char *xe_engine_class_name(uint32_t engine_class)
>  igt_main
>  {
>	struct drm_xe_engine_class_instance *hwe = NULL;
> +	struct xe_device *xe_dev;
>
>	igt_fixture {
>		struct stat sb;
> @@ -4527,7 +4528,10 @@ igt_main
>		igt_assert_eq(drm_fd, -1);
>
>		drm_fd = drm_open_driver(DRIVER_XE);
> -		xe_device_get(drm_fd);
> +		xe_dev = xe_device_get(drm_fd);
> +
> +		/* See xe_query_oa_units_new() */
> +		igt_require(xe_dev->oa_units);
>
>		devid = intel_get_drm_devid(drm_fd);
>		sysfs = igt_sysfs_open(drm_fd);
> --
> 2.34.1
>