Commit 869f4f98 authored by Hendrik Brueckner's avatar Hendrik Brueckner Committed by Martin Schwidefsky

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: default avatarHendrik Brueckner <brueckner@linux.ibm.com>
Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
parent 346d034d
...@@ -59,6 +59,7 @@ struct cpu_cf_events { ...@@ -59,6 +59,7 @@ struct cpu_cf_events {
}; };
DECLARE_PER_CPU(struct cpu_cf_events, cpu_cf_events); DECLARE_PER_CPU(struct cpu_cf_events, cpu_cf_events);
bool kernel_cpumcf_avail(void);
int __kernel_cpumcf_begin(void); int __kernel_cpumcf_begin(void);
unsigned long kernel_cpumcf_alert(int clear); unsigned long kernel_cpumcf_alert(int clear);
void __kernel_cpumcf_end(void); void __kernel_cpumcf_end(void);
......
...@@ -33,6 +33,9 @@ DEFINE_PER_CPU(struct cpu_cf_events, cpu_cf_events) = { ...@@ -33,6 +33,9 @@ DEFINE_PER_CPU(struct cpu_cf_events, cpu_cf_events) = {
.txn_flags = 0, .txn_flags = 0,
}; };
/* Indicator whether the CPU-Measurement Counter Facility Support is ready */
static bool cpum_cf_initalized;
static enum cpumf_ctr_set get_counter_set(u64 event) static enum cpumf_ctr_set get_counter_set(u64 event)
{ {
int set = CPUMF_CTR_SET_MAX; int set = CPUMF_CTR_SET_MAX;
...@@ -233,6 +236,12 @@ static void setup_pmc_cpu(void *flags) ...@@ -233,6 +236,12 @@ static void setup_pmc_cpu(void *flags)
lcctl(0); lcctl(0);
} }
bool kernel_cpumcf_avail(void)
{
return cpum_cf_initalized;
}
EXPORT_SYMBOL(kernel_cpumcf_avail);
/* Reserve/release functions for sharing perf hardware */ /* Reserve/release functions for sharing perf hardware */
static DEFINE_SPINLOCK(cpumcf_owner_lock); static DEFINE_SPINLOCK(cpumcf_owner_lock);
static void *cpumcf_owner; static void *cpumcf_owner;
...@@ -709,8 +718,13 @@ static int __init cpumf_pmu_init(void) ...@@ -709,8 +718,13 @@ static int __init cpumf_pmu_init(void)
cpumf_measurement_alert); cpumf_measurement_alert);
return rc; return rc;
} }
return cpuhp_setup_state(CPUHP_AP_PERF_S390_CF_ONLINE,
"perf/s390/cf:online", rc = cpuhp_setup_state(CPUHP_AP_PERF_S390_CF_ONLINE,
s390_pmu_online_cpu, s390_pmu_offline_cpu); "perf/s390/cf:online",
s390_pmu_online_cpu, s390_pmu_offline_cpu);
if (!rc)
cpum_cf_initalized = true;
return rc;
} }
early_initcall(cpumf_pmu_init); early_initcall(cpumf_pmu_init);
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