Commit | Line | Data |
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1da177e4 LT |
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> | |
1da177e4 LT |
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 | ||
25ad2913 | 59 | static char *get_cpu_type(void) |
1da177e4 LT |
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 | ||
25ad2913 | 78 | int perfmon_init(struct oprofile_operations *ops) |
1da177e4 LT |
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 | } |