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  */
  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 */