[PATCH i-g-t 1/5] tests/v3d_perfmon: Don't use the deprecated V3D_PERFCNT_NUM

["Maíra Canal" <mcanal@igalia.com>]

As described in the UAPI, one shouldn't use V3D_PERFCNT_NUM to retrieve
the maximum number of performance counters, as this value is only valid
for V3D 4.2. One should retrieve this parameter from the kernel using
DRM_V3D_PARAM_MAX_PERF_COUNTERS.

Due to this inconsistency, the test "create-perfmon-invalid-counters" is
currently failing in V3D 7.1 (Raspberry Pi 5).

Update the "create-perfmon-invalid-counters" test to the UAPI guideline
by replacing V3D_PERFCNT_NUM with the value retrieved from
DRM_IOCTL_V3D_GET_PARAM.

Signed-off-by: Maíra Canal <mcanal@igalia.com>
---
 tests/v3d/v3d_perfmon.c | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/tests/v3d/v3d_perfmon.c b/tests/v3d/v3d_perfmon.c
index ac6f094c3..5045e8c81 100644
--- a/tests/v3d/v3d_perfmon.c
+++ b/tests/v3d/v3d_perfmon.c
@@ -37,8 +37,18 @@ int igt_main()
 	igt_subtest("create-perfmon-invalid-counters") {
 		struct drm_v3d_perfmon_create create = {
 			.ncounters = 1,
-			.counters = { V3D_PERFCNT_NUM },
 		};
+		uint32_t total_perfcnt_num;
+
+		total_perfcnt_num = igt_v3d_get_param(fd, DRM_V3D_PARAM_MAX_PERF_COUNTERS);
+		igt_assert(total_perfcnt_num || errno != EINVAL);
+
+		/* Fallback if kernel < v6.11 */
+		if (!total_perfcnt_num)
+			total_perfcnt_num = V3D_PERFCNT_NUM;
+
+		create.counters[0] = total_perfcnt_num;
+
 		do_ioctl_err(fd, DRM_IOCTL_V3D_PERFMON_CREATE, &create, EINVAL);
 	}
 
-- 
2.54.0