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

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

arch/s390/include/asm/cpu_mcf.h

+1 −0
Original line number Diff line number Diff line
@@ -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);

arch/s390/kernel/perf_cpum_cf.c

+17 −3
Original line number Diff line number Diff line
@@ -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,



	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);