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authorHendrik Brueckner <brueckner@linux.ibm.com>2018-10-25 17:58:15 +0300
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2019-02-22 11:19:54 +0300
commit869f4f98fafadddb3a871b9513f24a44479d8296 (patch)
tree144ab4e9a70e7228393f08252a57a9c6f4aa8166 /arch/s390/kernel/perf_cpum_cf.c
parent346d034d7f13da9eb135458a2f6cf14c9b77a637 (diff)
downloadlinux-869f4f98fafadddb3a871b9513f24a44479d8296.tar.xz
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>
Diffstat (limited to 'arch/s390/kernel/perf_cpum_cf.c')
-rw-r--r--arch/s390/kernel/perf_cpum_cf.c20
1 files changed, 17 insertions, 3 deletions
diff --git a/arch/s390/kernel/perf_cpum_cf.c b/arch/s390/kernel/perf_cpum_cf.c
index c05f69142ce4..ab4b8c904d01 100644
--- a/arch/s390/kernel/perf_cpum_cf.c
+++ b/arch/s390/kernel/perf_cpum_cf.c
@@ -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);