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 */
31static char *metag_pmu_op_name;
32
33char *op_name_from_perf_id(void)
34{
35	return metag_pmu_op_name;
36}
37
38int __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
53void oprofile_arch_exit(void)
54{
55	oprofile_perf_exit();
56	kfree(metag_pmu_op_name);
57}
58#else
59int __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}
65void oprofile_arch_exit(void) {}
66#endif /* CONFIG_HW_PERF_EVENTS */
67