[PATCH i-g-t 3/4] lib/xe/xe_sriov_provisioning: Add helper to check default scheduling attributes

[Marcin Bernatowicz <marcin.bernatowicz@linux.intel.com>]

Introduce a function to validate default SR-IOV scheduling attributes
for VFs and PF. This function skips the test if non-default attributes
are detected. The default attributes verified include:

- exec_quantum_ms set to 0 (infinite execution quantum)
- preempt_timeout_us set to 0 (infinite preemption timeout)
- sched_if_idle set to false
- reset_engine set to false
- sched_priority set to XE_SRIOV_SCHED_PRIORITY_LOW

Signed-off-by: Marcin Bernatowicz <marcin.bernatowicz@linux.intel.com>
Cc: Adam Miszczak <adam.miszczak@linux.intel.com>
Cc: Jakub Kolakowski <jakub1.kolakowski@intel.com>
Cc: Lukasz Laguna <lukasz.laguna@intel.com>
Cc: Michał Wajdeczko <michal.wajdeczko@intel.com>
Cc: Michał Winiarski <michal.winiarski@intel.com>
Cc: Narasimha C V <narasimha.c.v@intel.com>
Cc: Piotr Piórkowski <piotr.piorkowski@intel.com>
Cc: Satyanarayana K V P <satyanarayana.k.v.p@intel.com>
Cc: Tomasz Lis <tomasz.lis@intel.com>
---
 lib/xe/xe_sriov_provisioning.c | 42 ++++++++++++++++++++++++++++++++++
 lib/xe/xe_sriov_provisioning.h |  1 +
 2 files changed, 43 insertions(+)

diff --git a/lib/xe/xe_sriov_provisioning.c b/lib/xe/xe_sriov_provisioning.c
index a1c94daf0..0c5cd01fd 100644
--- a/lib/xe/xe_sriov_provisioning.c
+++ b/lib/xe/xe_sriov_provisioning.c
@@ -519,3 +519,45 @@ void xe_sriov_set_sched_priority(int pf, unsigned int vf_num, unsigned int gt_nu
 {
 	igt_fail_on(__xe_sriov_set_sched_priority(pf, vf_num, gt_num, value));
 }
+
+/**
+ * xe_sriov_require_default_scheduling_attributes - Ensure default SR-IOV scheduling attributes
+ * @pf_fd: PF device file descriptor
+ *
+ * Skips the current test if non-default SR-IOV scheduling attributes are set.
+ *
+ * Default scheduling attributes are as follows for each VF and PF:
+ * - exec_quantum_ms equals zero (meaning infinity)
+ * - preempt_timeout_us equals zero (meaning infinity)
+ * - sched_if_idle equals false
+ * - reset_engine equals false
+ * - sched_priority equals XE_SRIOV_SCHED_PRIORITY_LOW
+ */
+void xe_sriov_require_default_scheduling_attributes(int pf)
+{
+	unsigned int totalvfs = igt_sriov_get_total_vfs(pf);
+	enum xe_sriov_sched_priority sched_priority;
+	bool sched_if_idle, reset_engine;
+	uint32_t eq, pt;
+	unsigned int gt;
+
+	xe_for_each_gt(pf, gt) {
+		igt_skip_on(__xe_sriov_get_sched_if_idle(pf, gt, &sched_if_idle));
+		igt_require_f(!sched_if_idle, "sched_if_idle != false on gt%u\n", gt);
+		igt_skip_on(__xe_sriov_get_engine_reset(pf, gt, &reset_engine));
+		igt_require_f(!reset_engine, "reset_engine != false on gt%u\n", gt);
+
+		for (unsigned int vf_num = 0; vf_num <= totalvfs; ++vf_num) {
+			igt_skip_on(__xe_sriov_get_exec_quantum_ms(pf, vf_num, gt, &eq));
+			igt_require_f(eq == 0, "exec_quantum_ms != 0 on gt%u/VF%u\n", gt, vf_num);
+
+			igt_skip_on(__xe_sriov_get_preempt_timeout_us(pf, vf_num, gt, &pt));
+			igt_require_f(pt == 0, "preempt_timeout_us != 0 on gt%u/VF%u\n",
+				      gt, vf_num);
+
+			igt_skip_on(__xe_sriov_get_sched_priority(pf, vf_num, gt, &sched_priority));
+			igt_require_f(sched_priority == XE_SRIOV_SCHED_PRIORITY_LOW,
+				      "sched_priority != LOW on gt%u/VF%u\n", gt, vf_num);
+		}
+	}
+}
diff --git a/lib/xe/xe_sriov_provisioning.h b/lib/xe/xe_sriov_provisioning.h
index 8e85985b7..4ddf3149f 100644
--- a/lib/xe/xe_sriov_provisioning.h
+++ b/lib/xe/xe_sriov_provisioning.h
@@ -99,5 +99,6 @@ int __xe_sriov_set_sched_priority(int pf, unsigned int vf_num, unsigned int gt_n
 				  enum xe_sriov_sched_priority value);
 void xe_sriov_set_sched_priority(int pf, unsigned int vf_num, unsigned int gt_num,
 				 enum xe_sriov_sched_priority value);
+void xe_sriov_require_default_scheduling_attributes(int pf);
 
 #endif /* __XE_SRIOV_PROVISIONING_H__ */
-- 
2.31.1