LXR linux/arch/metag/oprofile/common.c

   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