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s390/cpum_cf: introduce kernel_cpumcf_avail() function
A preparation to move out common CPU-MF counter facility support functions, first introduce a function that indicates whether the support is ready to use. Signed-off-by: Hendrik Brueckner <brueckner@linux.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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parent
346d034d7f
commit
869f4f98fa
2 changed files with 18 additions and 3 deletions
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@ -59,6 +59,7 @@ struct cpu_cf_events {
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};
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DECLARE_PER_CPU(struct cpu_cf_events, cpu_cf_events);
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bool kernel_cpumcf_avail(void);
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int __kernel_cpumcf_begin(void);
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unsigned long kernel_cpumcf_alert(int clear);
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void __kernel_cpumcf_end(void);
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@ -33,6 +33,9 @@ DEFINE_PER_CPU(struct cpu_cf_events, cpu_cf_events) = {
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.txn_flags = 0,
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};
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/* Indicator whether the CPU-Measurement Counter Facility Support is ready */
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static bool cpum_cf_initalized;
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static enum cpumf_ctr_set get_counter_set(u64 event)
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{
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int set = CPUMF_CTR_SET_MAX;
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@ -233,6 +236,12 @@ static void setup_pmc_cpu(void *flags)
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lcctl(0);
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}
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bool kernel_cpumcf_avail(void)
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{
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return cpum_cf_initalized;
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}
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EXPORT_SYMBOL(kernel_cpumcf_avail);
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/* Reserve/release functions for sharing perf hardware */
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static DEFINE_SPINLOCK(cpumcf_owner_lock);
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static void *cpumcf_owner;
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@ -709,8 +718,13 @@ static int __init cpumf_pmu_init(void)
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cpumf_measurement_alert);
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return rc;
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}
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return cpuhp_setup_state(CPUHP_AP_PERF_S390_CF_ONLINE,
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"perf/s390/cf:online",
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s390_pmu_online_cpu, s390_pmu_offline_cpu);
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rc = cpuhp_setup_state(CPUHP_AP_PERF_S390_CF_ONLINE,
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"perf/s390/cf:online",
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s390_pmu_online_cpu, s390_pmu_offline_cpu);
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if (!rc)
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cpum_cf_initalized = true;
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return rc;
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}
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early_initcall(cpumf_pmu_init);
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