diff options
Diffstat (limited to 'arch/s390/kernel/perf_cpum_cf_common.c')
| -rw-r--r-- | arch/s390/kernel/perf_cpum_cf_common.c | 163 |
1 files changed, 0 insertions, 163 deletions
diff --git a/arch/s390/kernel/perf_cpum_cf_common.c b/arch/s390/kernel/perf_cpum_cf_common.c deleted file mode 100644 index 99523dc3fc8b..000000000000 --- a/arch/s390/kernel/perf_cpum_cf_common.c +++ /dev/null @@ -1,163 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 -/* - * CPU-Measurement Counter Facility Support - Common Layer - * - * Copyright IBM Corp. 2019 - * Author(s): Hendrik Brueckner <brueckner@linux.ibm.com> - */ -#define KMSG_COMPONENT "cpum_cf_common" -#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt - -#include <linux/kernel.h> -#include <linux/kernel_stat.h> -#include <linux/percpu.h> -#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), - }, - .state = 0, - .dev_state = 0, - .flags = 0, - .used = 0, - .usedss = 0, - .sets = 0 -}; -/* Indicator whether the CPU-Measurement Counter Facility Support is ready */ -static bool cpum_cf_initalized; - -/* 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()); -} - -#define PMC_INIT 0 -#define PMC_RELEASE 1 -static void cpum_cf_setup_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); -} - -/* Initialize the CPU-measurement counter facility */ -int __kernel_cpumcf_begin(void) -{ - int flags = PMC_INIT; - - on_each_cpu(cpum_cf_setup_cpu, &flags, 1); - irq_subclass_register(IRQ_SUBCLASS_MEASUREMENT_ALERT); - - return 0; -} -EXPORT_SYMBOL(__kernel_cpumcf_begin); - -/* Release the CPU-measurement counter facility */ -void __kernel_cpumcf_end(void) -{ - int flags = PMC_RELEASE; - - on_each_cpu(cpum_cf_setup_cpu, &flags, 1); - irq_subclass_unregister(IRQ_SUBCLASS_MEASUREMENT_ALERT); -} -EXPORT_SYMBOL(__kernel_cpumcf_end); - -static int cpum_cf_setup(unsigned int cpu, int flags) -{ - local_irq_disable(); - cpum_cf_setup_cpu(&flags); - local_irq_enable(); - return 0; -} - -static int cpum_cf_online_cpu(unsigned int cpu) -{ - cpum_cf_setup(cpu, PMC_INIT); - return cfset_online_cpu(cpu); -} - -static int cpum_cf_offline_cpu(unsigned int cpu) -{ - cfset_offline_cpu(cpu); - return cpum_cf_setup(cpu, PMC_RELEASE); -} - -static int __init cpum_cf_init(void) -{ - int rc; - - if (!cpum_cf_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; - } - - rc = cpuhp_setup_state(CPUHP_AP_PERF_S390_CF_ONLINE, - "perf/s390/cf:online", - cpum_cf_online_cpu, cpum_cf_offline_cpu); - if (!rc) - cpum_cf_initalized = true; - - return rc; -} -early_initcall(cpum_cf_init); |