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   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/sysdev.h>
  14 #include <asm/semaphore.h>
  15
  16 #include "op_counter.h"
  17 #include "op_arm_model.h"
  18
  19 static struct op_arm_model_spec *pmu_model;
  20 static int pmu_enabled;
  21 static struct semaphore pmu_sem;
  22
  23 struct op_counter_config counter_config[OP_MAX_COUNTER];
  24
  25 static int pmu_create_files(struct super_block *sb, struct dentry *root)
  26 {
  27         unsigned int i;
  28
  29         for (i = 0; i < pmu_model->num_counters; i++) {
  30                 struct dentry *dir;
  31                 char buf[2];
  32
  33                 snprintf(buf, sizeof buf, "%d", i);
  34                 dir = oprofilefs_mkdir(sb, root, buf);
  35                 oprofilefs_create_ulong(sb, dir, "enabled", &counter_config[i].enabled);
  36                 oprofilefs_create_ulong(sb, dir, "event", &counter_config[i].event);
  37                 oprofilefs_create_ulong(sb, dir, "count", &counter_config[i].count);
  38                 oprofilefs_create_ulong(sb, dir, "unit_mask", &counter_config[i].unit_mask);
  39                 oprofilefs_create_ulong(sb, dir, "kernel", &counter_config[i].kernel);
  40                 oprofilefs_create_ulong(sb, dir, "user", &counter_config[i].user);
  41         }
  42
  43         return 0;
  44 }
  45
  46 static int pmu_setup(void)
  47 {
  48         int ret;
  49
  50         spin_lock(&oprofilefs_lock);
  51         ret = pmu_model->setup_ctrs();
  52         spin_unlock(&oprofilefs_lock);
  53         return ret;
  54 }
  55
  56 static int pmu_start(void)
  57 {
  58         int ret = -EBUSY;
  59
  60         down(&pmu_sem);
  61         if (!pmu_enabled) {
  62                 ret = pmu_model->start();
  63                 pmu_enabled = !ret;
  64         }
  65         up(&pmu_sem);
  66         return ret;
  67 }
  68
  69 static void pmu_stop(void)
  70 {
  71         down(&pmu_sem);
  72         if (pmu_enabled)
  73                 pmu_model->stop();
  74         pmu_enabled = 0;
  75         up(&pmu_sem);
  76 }
  77
  78 #ifdef CONFIG_PM
  79 static int pmu_suspend(struct sys_device *dev, pm_message_t state)
  80 {
  81         down(&pmu_sem);
  82         if (pmu_enabled)
  83                 pmu_model->stop();
  84         up(&pmu_sem);
  85         return 0;
  86 }
  87
  88 static int pmu_resume(struct sys_device *dev)
  89 {
  90         down(&pmu_sem);
  91         if (pmu_enabled && pmu_model->start())
  92                 pmu_enabled = 0;
  93         up(&pmu_sem);
  94         return 0;
  95 }
  96
  97 static struct sysdev_class oprofile_sysclass = {
  98         set_kset_name("oprofile"),
  99         .resume         = pmu_resume,
 100         .suspend        = pmu_suspend,
 101 };
 102
 103 static struct sys_device device_oprofile = {
 104         .id             = 0,
 105         .cls            = &oprofile_sysclass,
 106 };
 107
 108 static int __init init_driverfs(void)
 109 {
 110         int ret;
 111
 112         if (!(ret = sysdev_class_register(&oprofile_sysclass)))
 113                 ret = sysdev_register(&device_oprofile);
 114
 115         return ret;
 116 }
 117
 118 static void  exit_driverfs(void)
 119 {
 120         sysdev_unregister(&device_oprofile);
 121         sysdev_class_unregister(&oprofile_sysclass);
 122 }
 123 #else
 124 #define init_driverfs() do { } while (0)
 125 #define exit_driverfs() do { } while (0)
 126 #endif /* CONFIG_PM */
 127
 128 int __init pmu_init(struct oprofile_operations *ops, struct op_arm_model_spec *spec)
 129 {
 130         init_MUTEX(&pmu_sem);
 131
 132         if (spec->init() < 0)
 133                 return -ENODEV;
 134
 135         pmu_model = spec;
 136         init_driverfs();
 137         ops->create_files = pmu_create_files;
 138         ops->setup = pmu_setup;
 139         ops->shutdown = pmu_stop;
 140         ops->start = pmu_start;
 141         ops->stop = pmu_stop;
 142         ops->cpu_type = pmu_model->name;
 143         printk(KERN_INFO "oprofile: using %s PMU\n", spec->name);
 144
 145         return 0;
 146 }
 147
 148 void pmu_exit(void)
 149 {
 150         if (pmu_model) {
 151                 exit_driverfs();
 152                 pmu_model = NULL;
 153         }
 154 }
 155