arch/arm/oprofile/common.c

   1 /**
   2  * @file common.c
   3  *
   4  * @remark Copyright 2004 Oprofile Authors
   5  * @remark Read the file COPYING
   6  *
   7  * @author Zwane Mwaikambo
   8  */
   9
  10 #include <linux/init.h>
  11 #include <linux/oprofile.h>
  12 #include <linux/errno.h>
  13 #include <linux/slab.h>
  14 #include <linux/sysdev.h>
  15 #include <linux/mutex.h>
  16
  17 #include "op_counter.h"
  18 #include "op_arm_model.h"
  19
  20 static struct op_arm_model_spec *op_arm_model;
  21 static int op_arm_enabled;
  22 static DEFINE_MUTEX(op_arm_mutex);
  23
  24 struct op_counter_config *counter_config;
  25
  26 static int op_arm_create_files(struct super_block *sb, struct dentry *root)
  27 {
  28         unsigned int i;
  29
  30         for (i = 0; i < op_arm_model->num_counters; i++) {
  31                 struct dentry *dir;
  32                 char buf[4];
  33
  34                 snprintf(buf, sizeof buf, "%d", i);
  35                 dir = oprofilefs_mkdir(sb, root, buf);
  36                 oprofilefs_create_ulong(sb, dir, "enabled", &counter_config[i].enabled);
  37                 oprofilefs_create_ulong(sb, dir, "event", &counter_config[i].event);
  38                 oprofilefs_create_ulong(sb, dir, "count", &counter_config[i].count);
  39                 oprofilefs_create_ulong(sb, dir, "unit_mask", &counter_config[i].unit_mask);
  40                 oprofilefs_create_ulong(sb, dir, "kernel", &counter_config[i].kernel);
  41                 oprofilefs_create_ulong(sb, dir, "user", &counter_config[i].user);
  42         }
  43
  44         return 0;
  45 }
  46
  47 static int op_arm_setup(void)
  48 {
  49         int ret;
  50
  51         spin_lock(&oprofilefs_lock);
  52         ret = op_arm_model->setup_ctrs();
  53         spin_unlock(&oprofilefs_lock);
  54         return ret;
  55 }
  56
  57 static int op_arm_start(void)
  58 {
  59         int ret = -EBUSY;
  60
  61         mutex_lock(&op_arm_mutex);
  62         if (!op_arm_enabled) {
  63                 ret = op_arm_model->start();
  64                 op_arm_enabled = !ret;
  65         }
  66         mutex_unlock(&op_arm_mutex);
  67         return ret;
  68 }
  69
  70 static void op_arm_stop(void)
  71 {
  72         mutex_lock(&op_arm_mutex);
  73         if (op_arm_enabled)
  74                 op_arm_model->stop();
  75         op_arm_enabled = 0;
  76         mutex_unlock(&op_arm_mutex);
  77 }
  78
  79 #ifdef CONFIG_PM
  80 static int op_arm_suspend(struct sys_device *dev, pm_message_t state)
  81 {
  82         mutex_lock(&op_arm_mutex);
  83         if (op_arm_enabled)
  84                 op_arm_model->stop();
  85         mutex_unlock(&op_arm_mutex);
  86         return 0;
  87 }
  88
  89 static int op_arm_resume(struct sys_device *dev)
  90 {
  91         mutex_lock(&op_arm_mutex);
  92         if (op_arm_enabled && op_arm_model->start())
  93                 op_arm_enabled = 0;
  94         mutex_unlock(&op_arm_mutex);
  95         return 0;
  96 }
  97
  98 static struct sysdev_class oprofile_sysclass = {
  99         set_kset_name("oprofile"),
 100         .resume         = op_arm_resume,
 101         .suspend        = op_arm_suspend,
 102 };
 103
 104 static struct sys_device device_oprofile = {
 105         .id             = 0,
 106         .cls            = &oprofile_sysclass,
 107 };
 108
 109 static int __init init_driverfs(void)
 110 {
 111         int ret;
 112
 113         if (!(ret = sysdev_class_register(&oprofile_sysclass)))
 114                 ret = sysdev_register(&device_oprofile);
 115
 116         return ret;
 117 }
 118
 119 static void  exit_driverfs(void)
 120 {
 121         sysdev_unregister(&device_oprofile);
 122         sysdev_class_unregister(&oprofile_sysclass);
 123 }
 124 #else
 125 #define init_driverfs() do { } while (0)
 126 #define exit_driverfs() do { } while (0)
 127 #endif /* CONFIG_PM */
 128
 129 int __init oprofile_arch_init(struct oprofile_operations *ops)
 130 {
 131         struct op_arm_model_spec *spec = NULL;
 132         int ret = -ENODEV;
 133
 134 #ifdef CONFIG_CPU_XSCALE
 135         spec = &op_xscale_spec;
 136 #endif
 137
 138         if (spec) {
 139                 ret = spec->init();
 140                 if (ret < 0)
 141                         return ret;
 142
 143                 counter_config = kcalloc(spec->num_counters, sizeof(struct op_counter_config),
 144                                          GFP_KERNEL);
 145                 if (!counter_config)
 146                         return -ENOMEM;
 147
 148                 op_arm_model = spec;
 149                 init_driverfs();
 150                 ops->create_files = op_arm_create_files;
 151                 ops->setup = op_arm_setup;
 152                 ops->shutdown = op_arm_stop;
 153                 ops->start = op_arm_start;
 154                 ops->stop = op_arm_stop;
 155                 ops->cpu_type = op_arm_model->name;
 156                 ops->backtrace = arm_backtrace;
 157                 printk(KERN_INFO "oprofile: using %s\n", spec->name);
 158         }
 159
 160         return ret;
 161 }
 162
 163 void oprofile_arch_exit(void)
 164 {
 165         if (op_arm_model) {
 166                 exit_driverfs();
 167                 op_arm_model = NULL;
 168         }
 169         kfree(counter_config);
 170 }