arch/sh/oprofile/common.c

   1 /*
   2  * arch/sh/oprofile/init.c
   3  *
   4  * Copyright (C) 2003 - 2008  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 <asm/processor.h>
  21 #include "op_impl.h"
  22
  23 static struct op_sh_model *model;
  24
  25 static struct op_counter_config ctr[20];
  26
  27 extern void sh_backtrace(struct pt_regs * const regs, unsigned int depth);
  28
  29 static int op_sh_setup(void)
  30 {
  31         /* Pre-compute the values to stuff in the hardware registers.  */
  32         model->reg_setup(ctr);
  33
  34         /* Configure the registers on all cpus.  */
  35         on_each_cpu(model->cpu_setup, NULL, 1);
  36
  37         return 0;
  38 }
  39
  40 static int op_sh_create_files(struct super_block *sb, struct dentry *root)
  41 {
  42         int i, ret = 0;
  43
  44         for (i = 0; i < model->num_counters; i++) {
  45                 struct dentry *dir;
  46                 char buf[4];
  47
  48                 snprintf(buf, sizeof(buf), "%d", i);
  49                 dir = oprofilefs_mkdir(sb, root, buf);
  50
  51                 ret |= oprofilefs_create_ulong(sb, dir, "enabled", &ctr[i].enabled);
  52                 ret |= oprofilefs_create_ulong(sb, dir, "event", &ctr[i].event);
  53                 ret |= oprofilefs_create_ulong(sb, dir, "kernel", &ctr[i].kernel);
  54                 ret |= oprofilefs_create_ulong(sb, dir, "user", &ctr[i].user);
  55
  56                 if (model->create_files)
  57                         ret |= model->create_files(sb, dir);
  58                 else
  59                         ret |= oprofilefs_create_ulong(sb, dir, "count", &ctr[i].count);
  60
  61                 /* Dummy entries */
  62                 ret |= oprofilefs_create_ulong(sb, dir, "unit_mask", &ctr[i].unit_mask);
  63         }
  64
  65         return ret;
  66 }
  67
  68 static int op_sh_start(void)
  69 {
  70         /* Enable performance monitoring for all counters.  */
  71         on_each_cpu(model->cpu_start, NULL, 1);
  72
  73         return 0;
  74 }
  75
  76 static void op_sh_stop(void)
  77 {
  78         /* Disable performance monitoring for all counters.  */
  79         on_each_cpu(model->cpu_stop, NULL, 1);
  80 }
  81
  82 int __init oprofile_arch_init(struct oprofile_operations *ops)
  83 {
  84         struct op_sh_model *lmodel = NULL;
  85         int ret;
  86
  87         /*
  88          * Always assign the backtrace op. If the counter initialization
  89          * fails, we fall back to the timer which will still make use of
  90          * this.
  91          */
  92         ops->backtrace = sh_backtrace;
  93
  94         /*
  95          * XXX
  96          *
  97          * All of the SH7750/SH-4A counters have been converted to perf,
  98          * this infrastructure hook is left for other users until they've
  99          * had a chance to convert over, at which point all of this
 100          * will be deleted.
 101          */
 102
 103         if (!lmodel)
 104                 return -ENODEV;
 105         if (!(current_cpu_data.flags & CPU_HAS_PERF_COUNTER))
 106                 return -ENODEV;
 107
 108         ret = lmodel->init();
 109         if (unlikely(ret != 0))
 110                 return ret;
 111
 112         model = lmodel;
 113
 114         ops->setup              = op_sh_setup;
 115         ops->create_files       = op_sh_create_files;
 116         ops->start              = op_sh_start;
 117         ops->stop               = op_sh_stop;
 118         ops->cpu_type           = lmodel->cpu_type;
 119
 120         printk(KERN_INFO "oprofile: using %s performance monitoring.\n",
 121                lmodel->cpu_type);
 122
 123         return 0;
 124 }
 125
 126 void oprofile_arch_exit(void)
 127 {
 128         if (model && model->exit)
 129                 model->exit();
 130 }