125 lines
2.9 KiB
C
125 lines
2.9 KiB
C
/*
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* Performance event support for s390x
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*
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* Copyright IBM Corp. 2012
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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/percpu.h>
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#include <linux/export.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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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 (CPUMF)";
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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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return num;
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}
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EXPORT_SYMBOL(perf_num_counters);
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void perf_event_print_debug(void)
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{
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struct cpumf_ctr_info cf_info;
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unsigned long flags;
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int cpu;
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if (!cpum_cf_avail())
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return;
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local_irq_save(flags);
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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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print_hex_dump_bytes("CPUMF Query: ", DUMP_PREFIX_OFFSET,
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&cf_info, sizeof(cf_info));
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}
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local_irq_restore(flags);
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}
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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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sp = sp & PSW_ADDR_INSN;
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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] & PSW_ADDR_INSN);
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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 & PSW_ADDR_INSN;
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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,
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sf->gprs[8] & PSW_ADDR_INSN);
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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] & PSW_ADDR_INSN);
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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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