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244 lines
5.9 KiB
244 lines
5.9 KiB
// 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 <[email protected]> |
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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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#include <asm/unwind.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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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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/* 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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