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s390/cpum_cf: introduce kernel_cpumcf_avail() function

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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>
This commit is contained in:
Hendrik Brueckner 2018-10-25 16:58:15 +02:00 committed by Martin Schwidefsky
parent 346d034d7f
commit 869f4f98fa
2 changed files with 18 additions and 3 deletions
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1
arch/s390/include/asm/cpu_mcf.h
View file

@ -59,6 +59,7 @@ struct cpu_cf_events {
};
DECLARE_PER_CPU(struct cpu_cf_events, cpu_cf_events);
bool kernel_cpumcf_avail(void);
int __kernel_cpumcf_begin(void);
unsigned long kernel_cpumcf_alert(int clear);
void __kernel_cpumcf_end(void);

20
arch/s390/kernel/perf_cpum_cf.c
View file

@ -33,6 +33,9 @@ DEFINE_PER_CPU(struct cpu_cf_events, cpu_cf_events) = {
.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)
{
int set = CPUMF_CTR_SET_MAX;
@ -233,6 +236,12 @@ static void setup_pmc_cpu(void *flags)
lcctl(0);
}
bool kernel_cpumcf_avail(void)
{
return cpum_cf_initalized;
}
EXPORT_SYMBOL(kernel_cpumcf_avail);
/* Reserve/release functions for sharing perf hardware */
static DEFINE_SPINLOCK(cpumcf_owner_lock);
static void *cpumcf_owner;
@ -709,8 +718,13 @@ static int __init cpumf_pmu_init(void)
cpumf_measurement_alert);
return rc;
}
return cpuhp_setup_state(CPUHP_AP_PERF_S390_CF_ONLINE,
"perf/s390/cf:online",
s390_pmu_online_cpu, s390_pmu_offline_cpu);
rc = cpuhp_setup_state(CPUHP_AP_PERF_S390_CF_ONLINE,
"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);