1e3cab2f2f
Signed-off-by: Heiko Carstens <h.carstens@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
124 lines
2.9 KiB
C
124 lines
2.9 KiB
C
/*
|
|
* Performance event support for s390x
|
|
*
|
|
* Copyright IBM Corp. 2012
|
|
* Author(s): Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License (version 2 only)
|
|
* as published by the Free Software Foundation.
|
|
*/
|
|
#define KMSG_COMPONENT "perf"
|
|
#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/perf_event.h>
|
|
#include <linux/percpu.h>
|
|
#include <linux/export.h>
|
|
#include <asm/irq.h>
|
|
#include <asm/cpu_mf.h>
|
|
#include <asm/lowcore.h>
|
|
#include <asm/processor.h>
|
|
|
|
const char *perf_pmu_name(void)
|
|
{
|
|
if (cpum_cf_avail() || cpum_sf_avail())
|
|
return "CPU-measurement facilities (CPUMF)";
|
|
return "pmu";
|
|
}
|
|
EXPORT_SYMBOL(perf_pmu_name);
|
|
|
|
int perf_num_counters(void)
|
|
{
|
|
int num = 0;
|
|
|
|
if (cpum_cf_avail())
|
|
num += PERF_CPUM_CF_MAX_CTR;
|
|
|
|
return num;
|
|
}
|
|
EXPORT_SYMBOL(perf_num_counters);
|
|
|
|
void perf_event_print_debug(void)
|
|
{
|
|
struct cpumf_ctr_info cf_info;
|
|
unsigned long flags;
|
|
int cpu;
|
|
|
|
if (!cpum_cf_avail())
|
|
return;
|
|
|
|
local_irq_save(flags);
|
|
|
|
cpu = smp_processor_id();
|
|
memset(&cf_info, 0, sizeof(cf_info));
|
|
if (!qctri(&cf_info)) {
|
|
pr_info("CPU[%i] CPUM_CF: ver=%u.%u A=%04x E=%04x C=%04x\n",
|
|
cpu, cf_info.cfvn, cf_info.csvn,
|
|
cf_info.auth_ctl, cf_info.enable_ctl, cf_info.act_ctl);
|
|
print_hex_dump_bytes("CPUMF Query: ", DUMP_PREFIX_OFFSET,
|
|
&cf_info, sizeof(cf_info));
|
|
}
|
|
|
|
local_irq_restore(flags);
|
|
}
|
|
|
|
/* See also arch/s390/kernel/traps.c */
|
|
static unsigned long __store_trace(struct perf_callchain_entry *entry,
|
|
unsigned long sp,
|
|
unsigned long low, unsigned long high)
|
|
{
|
|
struct stack_frame *sf;
|
|
struct pt_regs *regs;
|
|
|
|
while (1) {
|
|
sp = sp & PSW_ADDR_INSN;
|
|
if (sp < low || sp > high - sizeof(*sf))
|
|
return sp;
|
|
sf = (struct stack_frame *) sp;
|
|
perf_callchain_store(entry, sf->gprs[8] & PSW_ADDR_INSN);
|
|
/* Follow the backchain. */
|
|
while (1) {
|
|
low = sp;
|
|
sp = sf->back_chain & PSW_ADDR_INSN;
|
|
if (!sp)
|
|
break;
|
|
if (sp <= low || sp > high - sizeof(*sf))
|
|
return sp;
|
|
sf = (struct stack_frame *) sp;
|
|
perf_callchain_store(entry,
|
|
sf->gprs[8] & PSW_ADDR_INSN);
|
|
}
|
|
/* Zero backchain detected, check for interrupt frame. */
|
|
sp = (unsigned long) (sf + 1);
|
|
if (sp <= low || sp > high - sizeof(*regs))
|
|
return sp;
|
|
regs = (struct pt_regs *) sp;
|
|
perf_callchain_store(entry, sf->gprs[8] & PSW_ADDR_INSN);
|
|
low = sp;
|
|
sp = regs->gprs[15];
|
|
}
|
|
}
|
|
|
|
void perf_callchain_kernel(struct perf_callchain_entry *entry,
|
|
struct pt_regs *regs)
|
|
{
|
|
unsigned long head;
|
|
struct stack_frame *head_sf;
|
|
|
|
if (user_mode(regs))
|
|
return;
|
|
|
|
head = regs->gprs[15];
|
|
head_sf = (struct stack_frame *) head;
|
|
|
|
if (!head_sf || !head_sf->back_chain)
|
|
return;
|
|
|
|
head = head_sf->back_chain;
|
|
head = __store_trace(entry, head, S390_lowcore.async_stack - ASYNC_SIZE,
|
|
S390_lowcore.async_stack);
|
|
|
|
__store_trace(entry, head, S390_lowcore.thread_info,
|
|
S390_lowcore.thread_info + THREAD_SIZE);
|
|
}
|