Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
| 17 | static int allow_ints; |
| 18 | |
| 19 | static int |
| 20 | perfmon_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 | |
| 36 | static int perfmon_start(void) |
| 37 | { |
| 38 | allow_ints = 1; |
| 39 | return 0; |
| 40 | } |
| 41 | |
| 42 | |
| 43 | static 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 | |
| 52 | static 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 | |
Robert Richter | 25ad291 | 2008-09-05 17:12:36 +0200 | [diff] [blame] | 59 | static char *get_cpu_type(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
| 76 | static int using_perfmon; |
| 77 | |
Robert Richter | 25ad291 | 2008-09-05 17:12:36 +0200 | [diff] [blame] | 78 | int perfmon_init(struct oprofile_operations *ops) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
| 93 | void perfmon_exit(void) |
| 94 | { |
| 95 | if (!using_perfmon) |
| 96 | return; |
| 97 | |
| 98 | pfm_unregister_buffer_fmt(oprofile_fmt.fmt_uuid); |
| 99 | } |