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00e6c923 JH |
1 | /* |
2 | * arch/metag/oprofile/common.c | |
3 | * | |
4 | * Copyright (C) 2013 Imagination Technologies Ltd. | |
5 | * | |
6 | * Based on arch/sh/oprofile/common.c: | |
7 | * | |
8 | * Copyright (C) 2003 - 2010 Paul Mundt | |
9 | * | |
10 | * Based on arch/mips/oprofile/common.c: | |
11 | * | |
12 | * Copyright (C) 2004, 2005 Ralf Baechle | |
13 | * Copyright (C) 2005 MIPS Technologies, Inc. | |
14 | * | |
15 | * This file is subject to the terms and conditions of the GNU General Public | |
16 | * License. See the file "COPYING" in the main directory of this archive | |
17 | * for more details. | |
18 | */ | |
19 | #include <linux/errno.h> | |
20 | #include <linux/init.h> | |
21 | #include <linux/oprofile.h> | |
22 | #include <linux/perf_event.h> | |
23 | #include <linux/slab.h> | |
24 | ||
25 | #include "backtrace.h" | |
26 | ||
27 | #ifdef CONFIG_HW_PERF_EVENTS | |
28 | /* | |
29 | * This will need to be reworked when multiple PMUs are supported. | |
30 | */ | |
31 | static char *metag_pmu_op_name; | |
32 | ||
33 | char *op_name_from_perf_id(void) | |
34 | { | |
35 | return metag_pmu_op_name; | |
36 | } | |
37 | ||
38 | int __init oprofile_arch_init(struct oprofile_operations *ops) | |
39 | { | |
40 | ops->backtrace = metag_backtrace; | |
41 | ||
42 | if (perf_num_counters() == 0) | |
43 | return -ENODEV; | |
44 | ||
45 | metag_pmu_op_name = kasprintf(GFP_KERNEL, "metag/%s", | |
46 | perf_pmu_name()); | |
47 | if (unlikely(!metag_pmu_op_name)) | |
48 | return -ENOMEM; | |
49 | ||
50 | return oprofile_perf_init(ops); | |
51 | } | |
52 | ||
53 | void oprofile_arch_exit(void) | |
54 | { | |
55 | oprofile_perf_exit(); | |
56 | kfree(metag_pmu_op_name); | |
57 | } | |
58 | #else | |
59 | int __init oprofile_arch_init(struct oprofile_operations *ops) | |
60 | { | |
61 | ops->backtrace = metag_backtrace; | |
62 | /* fall back to timer interrupt PC sampling */ | |
63 | return -ENODEV; | |
64 | } | |
65 | void oprofile_arch_exit(void) {} | |
66 | #endif /* CONFIG_HW_PERF_EVENTS */ |