s390/cpum_cf: move common functions into a separate file

Move common functions of the couter facility support into a separate
file.

Signed-off-by: Hendrik Brueckner <brueckner@linux.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

1 files changed, 3 insertions, 181 deletions

diff --git a/arch/s390/kernel/perf_cpum_cf.c b/arch/s390/kernel/perf_cpum_cf.c
index ab4b8c904d01..670ff98acb62 100644
--- a/arch/s390/kernel/perf_cpum_cf.c
+++ b/arch/s390/kernel/perf_cpum_cf.c
@@ -14,28 +14,8 @@
 #include <linux/notifier.h>
 #include <linux/init.h>
 #include <linux/export.h>
-#include <asm/ctl_reg.h>
-#include <asm/irq.h>
 #include <asm/cpu_mcf.h>
 
-/* Per-CPU event structure for the counter facility */
-DEFINE_PER_CPU(struct cpu_cf_events, cpu_cf_events) = {
-	.ctr_set = {
-		[CPUMF_CTR_SET_BASIC]	= ATOMIC_INIT(0),
-		[CPUMF_CTR_SET_USER]	= ATOMIC_INIT(0),
-		[CPUMF_CTR_SET_CRYPTO]	= ATOMIC_INIT(0),
-		[CPUMF_CTR_SET_EXT]	= ATOMIC_INIT(0),
-		[CPUMF_CTR_SET_MT_DIAG] = ATOMIC_INIT(0),
-	},
-	.alert = ATOMIC64_INIT(0),
-	.state = 0,
-	.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)
 {
 	int set = CPUMF_CTR_SET_MAX;
@@ -180,122 +160,6 @@ static atomic_t num_events = ATOMIC_INIT(0);
 /* Used to avoid races in calling reserve/release_cpumf_hardware */
 static DEFINE_MUTEX(pmc_reserve_mutex);
 
-/* CPU-measurement alerts for the counter facility */
-static void cpumf_measurement_alert(struct ext_code ext_code,
-				    unsigned int alert, unsigned long unused)
-{
-	struct cpu_cf_events *cpuhw;
-
-	if (!(alert & CPU_MF_INT_CF_MASK))
-		return;
-
-	inc_irq_stat(IRQEXT_CMC);
-	cpuhw = this_cpu_ptr(&cpu_cf_events);
-
-	/* Measurement alerts are shared and might happen when the PMU
-	 * is not reserved.  Ignore these alerts in this case. */
-	if (!(cpuhw->flags & PMU_F_RESERVED))
-		return;
-
-	/* counter authorization change alert */
-	if (alert & CPU_MF_INT_CF_CACA)
-		qctri(&cpuhw->info);
-
-	/* loss of counter data alert */
-	if (alert & CPU_MF_INT_CF_LCDA)
-		pr_err("CPU[%i] Counter data was lost\n", smp_processor_id());
-
-	/* loss of MT counter data alert */
-	if (alert & CPU_MF_INT_CF_MTDA)
-		pr_warn("CPU[%i] MT counter data was lost\n",
-			smp_processor_id());
-
-	/* store alert for special handling by in-kernel users */
-	atomic64_or(alert, &cpuhw->alert);
-}
-
-#define PMC_INIT      0
-#define PMC_RELEASE   1
-static void setup_pmc_cpu(void *flags)
-{
-	struct cpu_cf_events *cpuhw = this_cpu_ptr(&cpu_cf_events);
-
-	switch (*((int *) flags)) {
-	case PMC_INIT:
-		memset(&cpuhw->info, 0, sizeof(cpuhw->info));
-		qctri(&cpuhw->info);
-		cpuhw->flags |= PMU_F_RESERVED;
-		break;
-
-	case PMC_RELEASE:
-		cpuhw->flags &= ~PMU_F_RESERVED;
-		break;
-	}
-
-	/* Disable CPU counter sets */
-	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;
-
-/* Initialize the CPU-measurement counter facility */
-int __kernel_cpumcf_begin(void)
-{
-	int flags = PMC_INIT;
-	int err = 0;
-
-	spin_lock(&cpumcf_owner_lock);
-	if (cpumcf_owner)
-		err = -EBUSY;
-	else
-		cpumcf_owner = __builtin_return_address(0);
-	spin_unlock(&cpumcf_owner_lock);
-	if (err)
-		return err;
-
-	on_each_cpu(setup_pmc_cpu, &flags, 1);
-	irq_subclass_register(IRQ_SUBCLASS_MEASUREMENT_ALERT);
-
-	return 0;
-}
-EXPORT_SYMBOL(__kernel_cpumcf_begin);
-
-/* Obtain the CPU-measurement alerts for the counter facility */
-unsigned long kernel_cpumcf_alert(int clear)
-{
-	struct cpu_cf_events *cpuhw = this_cpu_ptr(&cpu_cf_events);
-	unsigned long alert;
-
-	alert = atomic64_read(&cpuhw->alert);
-	if (clear)
-		atomic64_set(&cpuhw->alert, 0);
-
-	return alert;
-}
-EXPORT_SYMBOL(kernel_cpumcf_alert);
-
-/* Release the CPU-measurement counter facility */
-void __kernel_cpumcf_end(void)
-{
-	int flags = PMC_RELEASE;
-
-	on_each_cpu(setup_pmc_cpu, &flags, 1);
-	irq_subclass_unregister(IRQ_SUBCLASS_MEASUREMENT_ALERT);
-
-	spin_lock(&cpumcf_owner_lock);
-	cpumcf_owner = NULL;
-	spin_unlock(&cpumcf_owner_lock);
-}
-EXPORT_SYMBOL(__kernel_cpumcf_end);
-
 /* Release the PMU if event is the last perf event */
 static void hw_perf_event_destroy(struct perf_event *event)
 {
@@ -672,59 +536,17 @@ static struct pmu cpumf_pmu = {
 	.cancel_txn   = cpumf_pmu_cancel_txn,
 };
 
-static int cpumf_pmf_setup(unsigned int cpu, int flags)
-{
-	local_irq_disable();
-	setup_pmc_cpu(&flags);
-	local_irq_enable();
-	return 0;
-}
-
-static int s390_pmu_online_cpu(unsigned int cpu)
-{
-	return cpumf_pmf_setup(cpu, PMC_INIT);
-}
-
-static int s390_pmu_offline_cpu(unsigned int cpu)
-{
-	return cpumf_pmf_setup(cpu, PMC_RELEASE);
-}
-
 static int __init cpumf_pmu_init(void)
 {
 	int rc;
 
-	if (!cpum_cf_avail())
+	if (!kernel_cpumcf_avail())
 		return -ENODEV;
 
-	/* clear bit 15 of cr0 to unauthorize problem-state to
-	 * extract measurement counters */
-	ctl_clear_bit(0, 48);
-
-	/* register handler for measurement-alert interruptions */
-	rc = register_external_irq(EXT_IRQ_MEASURE_ALERT,
-				   cpumf_measurement_alert);
-	if (rc) {
-		pr_err("Registering for CPU-measurement alerts "
-		       "failed with rc=%i\n", rc);
-		return rc;
-	}
-
 	cpumf_pmu.attr_groups = cpumf_cf_event_group();
 	rc = perf_pmu_register(&cpumf_pmu, "cpum_cf", PERF_TYPE_RAW);
-	if (rc) {
+	if (rc)
 		pr_err("Registering the cpum_cf PMU failed with rc=%i\n", rc);
-		unregister_external_irq(EXT_IRQ_MEASURE_ALERT,
-					cpumf_measurement_alert);
-		return rc;
-	}
-
-	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);
+subsys_initcall(cpumf_pmu_init);