4 * @remark Copyright 2003 OProfile authors
5 * @remark Read the file COPYING
7 * @author John Levon <levon@movementarian.org>
10 #include <linux/kernel.h>
11 #include <linux/config.h>
12 #include <linux/oprofile.h>
13 #include <linux/sched.h>
14 #include <asm/perfmon.h>
15 #include <asm/ptrace.h>
16 #include <asm/errno.h>
18 static int allow_ints;
21 perfmon_handler(struct task_struct *task, void *buf, pfm_ovfl_arg_t *arg,
22 struct pt_regs *regs, unsigned long stamp)
24 int event = arg->pmd_eventid;
26 arg->ovfl_ctrl.bits.reset_ovfl_pmds = 1;
28 /* the owner of the oprofile event buffer may have exited
29 * without perfmon being shutdown (e.g. SIGSEGV)
32 oprofile_add_sample(regs, event);
37 static int perfmon_start(void)
44 static void perfmon_stop(void)
50 #define OPROFILE_FMT_UUID { \
51 0x77, 0x7a, 0x6e, 0x61, 0x20, 0x65, 0x73, 0x69, 0x74, 0x6e, 0x72, 0x20, 0x61, 0x65, 0x0a, 0x6c }
53 static pfm_buffer_fmt_t oprofile_fmt = {
54 .fmt_name = "oprofile_format",
55 .fmt_uuid = OPROFILE_FMT_UUID,
56 .fmt_handler = perfmon_handler,
60 static char * get_cpu_type(void)
62 __u8 family = local_cpu_data->family;
66 return "ia64/itanium";
68 return "ia64/itanium2";
75 /* all the ops are handled via userspace for IA64 perfmon */
77 static int using_perfmon;
79 int perfmon_init(struct oprofile_operations * ops)
81 int ret = pfm_register_buffer_fmt(&oprofile_fmt);
85 ops->cpu_type = get_cpu_type();
86 ops->start = perfmon_start;
87 ops->stop = perfmon_stop;
89 printk(KERN_INFO "oprofile: using perfmon.\n");
94 void perfmon_exit(void)
99 pfm_unregister_buffer_fmt(oprofile_fmt.fmt_uuid);