arch/sh/oprofile/common.c

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