1/** 2 * @file perfmon.c 3 * 4 * @remark Copyright 2003 OProfile authors 5 * @remark Read the file COPYING 6 * 7 * @author John Levon <levon@movementarian.org> 8 */ 9 10#include <linux/kernel.h> 11#include <linux/oprofile.h> 12#include <linux/sched.h> 13#include <asm/perfmon.h> 14#include <asm/ptrace.h> 15#include <asm/errno.h> 16 17static int allow_ints; 18 19static int 20perfmon_handler(struct task_struct *task, void *buf, pfm_ovfl_arg_t *arg, 21 struct pt_regs *regs, unsigned long stamp) 22{ 23 int event = arg->pmd_eventid; 24 25 arg->ovfl_ctrl.bits.reset_ovfl_pmds = 1; 26 27 /* the owner of the oprofile event buffer may have exited 28 * without perfmon being shutdown (e.g. SIGSEGV) 29 */ 30 if (allow_ints) 31 oprofile_add_sample(regs, event); 32 return 0; 33} 34 35 36static int perfmon_start(void) 37{ 38 allow_ints = 1; 39 return 0; 40} 41 42 43static void perfmon_stop(void) 44{ 45 allow_ints = 0; 46} 47 48 49#define OPROFILE_FMT_UUID { \ 50 0x77, 0x7a, 0x6e, 0x61, 0x20, 0x65, 0x73, 0x69, 0x74, 0x6e, 0x72, 0x20, 0x61, 0x65, 0x0a, 0x6c } 51 52static pfm_buffer_fmt_t oprofile_fmt = { 53 .fmt_name = "oprofile_format", 54 .fmt_uuid = OPROFILE_FMT_UUID, 55 .fmt_handler = perfmon_handler, 56}; 57 58 59static char *get_cpu_type(void) 60{ 61 __u8 family = local_cpu_data->family; 62 63 switch (family) { 64 case 0x07: 65 return "ia64/itanium"; 66 case 0x1f: 67 return "ia64/itanium2"; 68 default: 69 return "ia64/ia64"; 70 } 71} 72 73 74/* all the ops are handled via userspace for IA64 perfmon */ 75 76static int using_perfmon; 77 78int perfmon_init(struct oprofile_operations *ops) 79{ 80 int ret = pfm_register_buffer_fmt(&oprofile_fmt); 81 if (ret) 82 return -ENODEV; 83 84 ops->cpu_type = get_cpu_type(); 85 ops->start = perfmon_start; 86 ops->stop = perfmon_stop; 87 using_perfmon = 1; 88 printk(KERN_INFO "oprofile: using perfmon.\n"); 89 return 0; 90} 91 92 93void perfmon_exit(void) 94{ 95 if (!using_perfmon) 96 return; 97 98 pfm_unregister_buffer_fmt(oprofile_fmt.fmt_uuid); 99} 100