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perfmon.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);
}

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