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ebd912ff99
The two functions perf_callchain_user() and arch_stack_walk_user() are
nearly identical. Reduce code duplication and add a common helper which can
be called by both functions.
Fixes: aa44433ac4
("s390: add USER_STACKTRACE support")
Reviewed-by: Jens Remus <jremus@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
233 lines
5.7 KiB
C
233 lines
5.7 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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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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#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/uaccess.h>
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#include <linux/compat.h>
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#include <linux/sysfs.h>
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#include <asm/stacktrace.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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#include <asm/unwind.h>
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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->sie_control_block;
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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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void perf_callchain_kernel(struct perf_callchain_entry_ctx *entry,
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struct pt_regs *regs)
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{
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struct unwind_state state;
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unsigned long addr;
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unwind_for_each_frame(&state, current, regs, 0) {
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addr = unwind_get_return_address(&state);
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if (!addr || perf_callchain_store(entry, addr))
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return;
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}
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}
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void perf_callchain_user(struct perf_callchain_entry_ctx *entry,
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struct pt_regs *regs)
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{
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arch_stack_walk_user_common(NULL, NULL, entry, regs, true);
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}
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/* Perf definitions 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\n", pmu_attr->id);
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}
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