mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-10-31 00:17:44 +00:00
99 lines
1.8 KiB
C
99 lines
1.8 KiB
C
/**
|
|
* @file perfmon.c
|
|
*
|
|
* @remark Copyright 2003 OProfile authors
|
|
* @remark Read the file COPYING
|
|
*
|
|
* @author John Levon <levon@movementarian.org>
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/oprofile.h>
|
|
#include <linux/sched.h>
|
|
#include <asm/perfmon.h>
|
|
#include <asm/ptrace.h>
|
|
#include <asm/errno.h>
|
|
|
|
static int allow_ints;
|
|
|
|
static int
|
|
perfmon_handler(struct task_struct *task, void *buf, pfm_ovfl_arg_t *arg,
|
|
struct pt_regs *regs, unsigned long stamp)
|
|
{
|
|
int event = arg->pmd_eventid;
|
|
|
|
arg->ovfl_ctrl.bits.reset_ovfl_pmds = 1;
|
|
|
|
/* the owner of the oprofile event buffer may have exited
|
|
* without perfmon being shutdown (e.g. SIGSEGV)
|
|
*/
|
|
if (allow_ints)
|
|
oprofile_add_sample(regs, event);
|
|
return 0;
|
|
}
|
|
|
|
|
|
static int perfmon_start(void)
|
|
{
|
|
allow_ints = 1;
|
|
return 0;
|
|
}
|
|
|
|
|
|
static void perfmon_stop(void)
|
|
{
|
|
allow_ints = 0;
|
|
}
|
|
|
|
|
|
#define OPROFILE_FMT_UUID { \
|
|
0x77, 0x7a, 0x6e, 0x61, 0x20, 0x65, 0x73, 0x69, 0x74, 0x6e, 0x72, 0x20, 0x61, 0x65, 0x0a, 0x6c }
|
|
|
|
static pfm_buffer_fmt_t oprofile_fmt = {
|
|
.fmt_name = "oprofile_format",
|
|
.fmt_uuid = OPROFILE_FMT_UUID,
|
|
.fmt_handler = perfmon_handler,
|
|
};
|
|
|
|
|
|
static char *get_cpu_type(void)
|
|
{
|
|
__u8 family = local_cpu_data->family;
|
|
|
|
switch (family) {
|
|
case 0x07:
|
|
return "ia64/itanium";
|
|
case 0x1f:
|
|
return "ia64/itanium2";
|
|
default:
|
|
return "ia64/ia64";
|
|
}
|
|
}
|
|
|
|
|
|
/* all the ops are handled via userspace for IA64 perfmon */
|
|
|
|
static int using_perfmon;
|
|
|
|
int perfmon_init(struct oprofile_operations *ops)
|
|
{
|
|
int ret = pfm_register_buffer_fmt(&oprofile_fmt);
|
|
if (ret)
|
|
return -ENODEV;
|
|
|
|
ops->cpu_type = get_cpu_type();
|
|
ops->start = perfmon_start;
|
|
ops->stop = perfmon_stop;
|
|
using_perfmon = 1;
|
|
printk(KERN_INFO "oprofile: using perfmon.\n");
|
|
return 0;
|
|
}
|
|
|
|
|
|
void perfmon_exit(void)
|
|
{
|
|
if (!using_perfmon)
|
|
return;
|
|
|
|
pfm_unregister_buffer_fmt(oprofile_fmt.fmt_uuid);
|
|
}
|