forked from Minki/linux
9cb1ccecb6
Yet another leftover from the 31 bit era. The usual operation "y = x & PSW_ADDR_INSN" with the PSW_ADDR_INSN mask is a nop for CONFIG_64BIT. Therefore remove all usages and hope the code is a bit less confusing. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Reviewed-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
323 lines
7.8 KiB
C
323 lines
7.8 KiB
C
/*
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* Performance event support for s390x
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*
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* Copyright IBM Corp. 2012, 2013
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* Author(s): Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License (version 2 only)
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* as published by the Free Software Foundation.
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*/
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#define KMSG_COMPONENT "perf"
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#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
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#include <linux/kernel.h>
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#include <linux/perf_event.h>
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#include <linux/kvm_host.h>
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#include <linux/percpu.h>
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#include <linux/export.h>
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#include <linux/seq_file.h>
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#include <linux/spinlock.h>
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#include <linux/sysfs.h>
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#include <asm/irq.h>
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#include <asm/cpu_mf.h>
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#include <asm/lowcore.h>
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#include <asm/processor.h>
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#include <asm/sysinfo.h>
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const char *perf_pmu_name(void)
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{
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if (cpum_cf_avail() || cpum_sf_avail())
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return "CPU-Measurement Facilities (CPU-MF)";
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return "pmu";
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}
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EXPORT_SYMBOL(perf_pmu_name);
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int perf_num_counters(void)
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{
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int num = 0;
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if (cpum_cf_avail())
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num += PERF_CPUM_CF_MAX_CTR;
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if (cpum_sf_avail())
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num += PERF_CPUM_SF_MAX_CTR;
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return num;
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}
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EXPORT_SYMBOL(perf_num_counters);
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static struct kvm_s390_sie_block *sie_block(struct pt_regs *regs)
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{
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struct stack_frame *stack = (struct stack_frame *) regs->gprs[15];
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if (!stack)
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return NULL;
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return (struct kvm_s390_sie_block *) stack->empty1[0];
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}
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static bool is_in_guest(struct pt_regs *regs)
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{
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if (user_mode(regs))
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return false;
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#if IS_ENABLED(CONFIG_KVM)
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return instruction_pointer(regs) == (unsigned long) &sie_exit;
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#else
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return false;
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#endif
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}
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static unsigned long guest_is_user_mode(struct pt_regs *regs)
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{
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return sie_block(regs)->gpsw.mask & PSW_MASK_PSTATE;
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}
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static unsigned long instruction_pointer_guest(struct pt_regs *regs)
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{
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return sie_block(regs)->gpsw.addr;
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}
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unsigned long perf_instruction_pointer(struct pt_regs *regs)
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{
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return is_in_guest(regs) ? instruction_pointer_guest(regs)
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: instruction_pointer(regs);
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}
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static unsigned long perf_misc_guest_flags(struct pt_regs *regs)
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{
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return guest_is_user_mode(regs) ? PERF_RECORD_MISC_GUEST_USER
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: PERF_RECORD_MISC_GUEST_KERNEL;
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}
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static unsigned long perf_misc_flags_sf(struct pt_regs *regs)
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{
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struct perf_sf_sde_regs *sde_regs;
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unsigned long flags;
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sde_regs = (struct perf_sf_sde_regs *) ®s->int_parm_long;
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if (sde_regs->in_guest)
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flags = user_mode(regs) ? PERF_RECORD_MISC_GUEST_USER
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: PERF_RECORD_MISC_GUEST_KERNEL;
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else
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flags = user_mode(regs) ? PERF_RECORD_MISC_USER
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: PERF_RECORD_MISC_KERNEL;
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return flags;
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}
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unsigned long perf_misc_flags(struct pt_regs *regs)
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{
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/* Check if the cpum_sf PMU has created the pt_regs structure.
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* In this case, perf misc flags can be easily extracted. Otherwise,
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* do regular checks on the pt_regs content.
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*/
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if (regs->int_code == 0x1407 && regs->int_parm == CPU_MF_INT_SF_PRA)
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if (!regs->gprs[15])
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return perf_misc_flags_sf(regs);
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if (is_in_guest(regs))
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return perf_misc_guest_flags(regs);
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return user_mode(regs) ? PERF_RECORD_MISC_USER
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: PERF_RECORD_MISC_KERNEL;
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}
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static void print_debug_cf(void)
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{
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struct cpumf_ctr_info cf_info;
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int cpu = smp_processor_id();
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memset(&cf_info, 0, sizeof(cf_info));
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if (!qctri(&cf_info))
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pr_info("CPU[%i] CPUM_CF: ver=%u.%u A=%04x E=%04x C=%04x\n",
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cpu, cf_info.cfvn, cf_info.csvn,
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cf_info.auth_ctl, cf_info.enable_ctl, cf_info.act_ctl);
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}
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static void print_debug_sf(void)
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{
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struct hws_qsi_info_block si;
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int cpu = smp_processor_id();
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memset(&si, 0, sizeof(si));
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if (qsi(&si))
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return;
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pr_info("CPU[%i] CPUM_SF: basic=%i diag=%i min=%lu max=%lu cpu_speed=%u\n",
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cpu, si.as, si.ad, si.min_sampl_rate, si.max_sampl_rate,
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si.cpu_speed);
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if (si.as)
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pr_info("CPU[%i] CPUM_SF: Basic-sampling: a=%i e=%i c=%i"
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" bsdes=%i tear=%016lx dear=%016lx\n", cpu,
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si.as, si.es, si.cs, si.bsdes, si.tear, si.dear);
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if (si.ad)
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pr_info("CPU[%i] CPUM_SF: Diagnostic-sampling: a=%i e=%i c=%i"
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" dsdes=%i tear=%016lx dear=%016lx\n", cpu,
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si.ad, si.ed, si.cd, si.dsdes, si.tear, si.dear);
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}
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void perf_event_print_debug(void)
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{
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unsigned long flags;
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local_irq_save(flags);
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if (cpum_cf_avail())
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print_debug_cf();
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if (cpum_sf_avail())
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print_debug_sf();
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local_irq_restore(flags);
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}
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/* Service level infrastructure */
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static void sl_print_counter(struct seq_file *m)
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{
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struct cpumf_ctr_info ci;
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memset(&ci, 0, sizeof(ci));
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if (qctri(&ci))
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return;
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seq_printf(m, "CPU-MF: Counter facility: version=%u.%u "
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"authorization=%04x\n", ci.cfvn, ci.csvn, ci.auth_ctl);
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}
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static void sl_print_sampling(struct seq_file *m)
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{
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struct hws_qsi_info_block si;
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memset(&si, 0, sizeof(si));
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if (qsi(&si))
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return;
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if (!si.as && !si.ad)
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return;
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seq_printf(m, "CPU-MF: Sampling facility: min_rate=%lu max_rate=%lu"
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" cpu_speed=%u\n", si.min_sampl_rate, si.max_sampl_rate,
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si.cpu_speed);
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if (si.as)
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seq_printf(m, "CPU-MF: Sampling facility: mode=basic"
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" sample_size=%u\n", si.bsdes);
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if (si.ad)
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seq_printf(m, "CPU-MF: Sampling facility: mode=diagnostic"
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" sample_size=%u\n", si.dsdes);
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}
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static void service_level_perf_print(struct seq_file *m,
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struct service_level *sl)
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{
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if (cpum_cf_avail())
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sl_print_counter(m);
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if (cpum_sf_avail())
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sl_print_sampling(m);
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}
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static struct service_level service_level_perf = {
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.seq_print = service_level_perf_print,
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};
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static int __init service_level_perf_register(void)
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{
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return register_service_level(&service_level_perf);
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}
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arch_initcall(service_level_perf_register);
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/* See also arch/s390/kernel/traps.c */
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static unsigned long __store_trace(struct perf_callchain_entry *entry,
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unsigned long sp,
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unsigned long low, unsigned long high)
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{
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struct stack_frame *sf;
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struct pt_regs *regs;
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while (1) {
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if (sp < low || sp > high - sizeof(*sf))
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return sp;
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sf = (struct stack_frame *) sp;
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perf_callchain_store(entry, sf->gprs[8]);
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/* Follow the backchain. */
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while (1) {
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low = sp;
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sp = sf->back_chain;
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if (!sp)
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break;
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if (sp <= low || sp > high - sizeof(*sf))
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return sp;
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sf = (struct stack_frame *) sp;
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perf_callchain_store(entry, sf->gprs[8]);
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}
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/* Zero backchain detected, check for interrupt frame. */
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sp = (unsigned long) (sf + 1);
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if (sp <= low || sp > high - sizeof(*regs))
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return sp;
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regs = (struct pt_regs *) sp;
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perf_callchain_store(entry, sf->gprs[8]);
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low = sp;
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sp = regs->gprs[15];
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}
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}
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void perf_callchain_kernel(struct perf_callchain_entry *entry,
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struct pt_regs *regs)
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{
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unsigned long head;
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struct stack_frame *head_sf;
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if (user_mode(regs))
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return;
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head = regs->gprs[15];
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head_sf = (struct stack_frame *) head;
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if (!head_sf || !head_sf->back_chain)
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return;
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head = head_sf->back_chain;
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head = __store_trace(entry, head, S390_lowcore.async_stack - ASYNC_SIZE,
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S390_lowcore.async_stack);
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__store_trace(entry, head, S390_lowcore.thread_info,
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S390_lowcore.thread_info + THREAD_SIZE);
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}
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/* Perf defintions for PMU event attributes in sysfs */
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ssize_t cpumf_events_sysfs_show(struct device *dev,
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struct device_attribute *attr, char *page)
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{
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struct perf_pmu_events_attr *pmu_attr;
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pmu_attr = container_of(attr, struct perf_pmu_events_attr, attr);
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return sprintf(page, "event=0x%04llx,name=%s\n",
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pmu_attr->id, attr->attr.name);
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}
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/* Reserve/release functions for sharing perf hardware */
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static DEFINE_SPINLOCK(perf_hw_owner_lock);
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static void *perf_sampling_owner;
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int perf_reserve_sampling(void)
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{
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int err;
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err = 0;
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spin_lock(&perf_hw_owner_lock);
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if (perf_sampling_owner) {
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pr_warn("The sampling facility is already reserved by %p\n",
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perf_sampling_owner);
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err = -EBUSY;
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} else
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perf_sampling_owner = __builtin_return_address(0);
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spin_unlock(&perf_hw_owner_lock);
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return err;
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}
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EXPORT_SYMBOL(perf_reserve_sampling);
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void perf_release_sampling(void)
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{
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spin_lock(&perf_hw_owner_lock);
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WARN_ON(!perf_sampling_owner);
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perf_sampling_owner = NULL;
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spin_unlock(&perf_hw_owner_lock);
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}
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EXPORT_SYMBOL(perf_release_sampling);
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