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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 <asm/semaphore.h>
  14 #include <linux/sysdev.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 static int pmu_start(void);
  24 static int pmu_setup(void);
  25 static void pmu_stop(void);
  26 static int pmu_create_files(struct super_block *, struct dentry *);
  27
  28 #ifdef CONFIG_PM
  29 static int pmu_suspend(struct sys_device *dev, pm_message_t state)
  30 {
  31         if (pmu_enabled)
  32                 pmu_stop();
  33         return 0;
  34 }
  35
  36 static int pmu_resume(struct sys_device *dev)
  37 {
  38         if (pmu_enabled)
  39                 pmu_start();
  40         return 0;
  41 }
  42
  43 static struct sysdev_class oprofile_sysclass = {
  44         set_kset_name("oprofile"),
  45         .resume         = pmu_resume,
  46         .suspend        = pmu_suspend,
  47 };
  48
  49 static struct sys_device device_oprofile = {
  50         .id             = 0,
  51         .cls            = &oprofile_sysclass,
  52 };
  53
  54 static int __init init_driverfs(void)
  55 {
  56         int ret;
  57
  58         if (!(ret = sysdev_class_register(&oprofile_sysclass)))
  59                 ret = sysdev_register(&device_oprofile);
  60
  61         return ret;
  62 }
  63
  64 static void  exit_driverfs(void)
  65 {
  66         sysdev_unregister(&device_oprofile);
  67         sysdev_class_unregister(&oprofile_sysclass);
  68 }
  69 #else
  70 #define init_driverfs() do { } while (0)
  71 #define exit_driverfs() do { } while (0)
  72 #endif /* CONFIG_PM */
  73
  74 struct op_counter_config counter_config[OP_MAX_COUNTER];
  75
  76 static int pmu_create_files(struct super_block *sb, struct dentry *root)
  77 {
  78         unsigned int i;
  79
  80         for (i = 0; i < pmu_model->num_counters; i++) {
  81                 struct dentry *dir;
  82                 char buf[2];
  83
  84                 snprintf(buf, sizeof buf, "%d", i);
  85                 dir = oprofilefs_mkdir(sb, root, buf);
  86                 oprofilefs_create_ulong(sb, dir, "enabled", &counter_config[i].enabled);
  87                 oprofilefs_create_ulong(sb, dir, "event", &counter_config[i].event);
  88                 oprofilefs_create_ulong(sb, dir, "count", &counter_config[i].count);
  89                 oprofilefs_create_ulong(sb, dir, "unit_mask", &counter_config[i].unit_mask);
  90                 oprofilefs_create_ulong(sb, dir, "kernel", &counter_config[i].kernel);
  91                 oprofilefs_create_ulong(sb, dir, "user", &counter_config[i].user);
  92         }
  93
  94         return 0;
  95 }
  96
  97 static int pmu_setup(void)
  98 {
  99         int ret;
 100
 101         spin_lock(&oprofilefs_lock);
 102         ret = pmu_model->setup_ctrs();
 103         spin_unlock(&oprofilefs_lock);
 104         return ret;
 105 }
 106
 107 static int pmu_start(void)
 108 {
 109         int ret = -EBUSY;
 110
 111         down(&pmu_sem);
 112         if (!pmu_enabled) {
 113                 ret = pmu_model->start();
 114                 pmu_enabled = !ret;
 115         }
 116         up(&pmu_sem);
 117         return ret;
 118 }
 119
 120 static void pmu_stop(void)
 121 {
 122         down(&pmu_sem);
 123         if (pmu_enabled)
 124                 pmu_model->stop();
 125         pmu_enabled = 0;
 126         up(&pmu_sem);
 127 }
 128
 129 int __init pmu_init(struct oprofile_operations *ops, struct op_arm_model_spec *spec)
 130 {
 131         init_MUTEX(&pmu_sem);
 132
 133         if (spec->init() < 0)
 134                 return -ENODEV;
 135
 136         pmu_model = spec;
 137         init_driverfs();
 138         ops->create_files = pmu_create_files;
 139         ops->setup = pmu_setup;
 140         ops->shutdown = pmu_stop;
 141         ops->start = pmu_start;
 142         ops->stop = pmu_stop;
 143         ops->cpu_type = pmu_model->name;
 144         printk(KERN_INFO "oprofile: using %s PMU\n", spec->name);
 145
 146         return 0;
 147 }
 148
 149 void pmu_exit(void)
 150 {
 151         if (pmu_model) {
 152                 exit_driverfs();
 153                 pmu_model = NULL;
 154         }
 155 }
 156