perf/x86/intel: Factor out intel_pmu_check_num_counters

Each Hybrid PMU has to check its own number of counters and mask fixed
counters before registration.

The intel_pmu_check_num_counters will be reused later to check the
number of the counters for each hybrid PMU.

Signed-off-by: Kan Liang <kan.liang@linux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Andi Kleen <ak@linux.intel.com>
Link: https://lkml.kernel.org/r/1618237865-33448-12-git-send-email-kan.liang@linux.intel.com

arch/x86/events/intel/core.c

@@ -5064,6 +5064,26 @@ static const struct attribute_group *attr_update[] = {
 
 static struct attribute *empty_attrs;
 
+static void intel_pmu_check_num_counters(int *num_counters,
+					 int *num_counters_fixed,
+					 u64 *intel_ctrl, u64 fixed_mask)
+{
+	if (*num_counters > INTEL_PMC_MAX_GENERIC) {
+		WARN(1, KERN_ERR "hw perf events %d > max(%d), clipping!",
+		     *num_counters, INTEL_PMC_MAX_GENERIC);
+		*num_counters = INTEL_PMC_MAX_GENERIC;
+	}
+	*intel_ctrl = (1ULL << *num_counters) - 1;
+
+	if (*num_counters_fixed > INTEL_PMC_MAX_FIXED) {
+		WARN(1, KERN_ERR "hw perf events fixed %d > max(%d), clipping!",
+		     *num_counters_fixed, INTEL_PMC_MAX_FIXED);
+		*num_counters_fixed = INTEL_PMC_MAX_FIXED;
+	}
+
+	*intel_ctrl |= fixed_mask << INTEL_PMC_IDX_FIXED;
+}
+
 __init int intel_pmu_init(void)
 {
 	struct attribute **extra_skl_attr = &empty_attrs;
@@ -5703,20 +5723,10 @@ __init int intel_pmu_init(void)
 
 	x86_pmu.attr_update = attr_update;
 
-	if (x86_pmu.num_counters > INTEL_PMC_MAX_GENERIC) {
-		WARN(1, KERN_ERR "hw perf events %d > max(%d), clipping!",
-		     x86_pmu.num_counters, INTEL_PMC_MAX_GENERIC);
-		x86_pmu.num_counters = INTEL_PMC_MAX_GENERIC;
-	}
-	x86_pmu.intel_ctrl = (1ULL << x86_pmu.num_counters) - 1;
-
-	if (x86_pmu.num_counters_fixed > INTEL_PMC_MAX_FIXED) {
-		WARN(1, KERN_ERR "hw perf events fixed %d > max(%d), clipping!",
-		     x86_pmu.num_counters_fixed, INTEL_PMC_MAX_FIXED);
-		x86_pmu.num_counters_fixed = INTEL_PMC_MAX_FIXED;
-	}
-
-	x86_pmu.intel_ctrl |= (u64)fixed_mask << INTEL_PMC_IDX_FIXED;
+	intel_pmu_check_num_counters(&x86_pmu.num_counters,
+				     &x86_pmu.num_counters_fixed,
+				     &x86_pmu.intel_ctrl,
+				     (u64)fixed_mask);
 
 	/* AnyThread may be deprecated on arch perfmon v5 or later */
 	if (x86_pmu.intel_cap.anythread_deprecated)