drivers/ras/debugfs.c

   1 #include <linux/debugfs.h>
   2
   3 static struct dentry *ras_debugfs_dir;
   4
   5 static atomic_t trace_count = ATOMIC_INIT(0);
   6
   7 int ras_userspace_consumers(void)
   8 {
   9         return atomic_read(&trace_count);
  10 }
  11 EXPORT_SYMBOL_GPL(ras_userspace_consumers);
  12
  13 static int trace_show(struct seq_file *m, void *v)
  14 {
  15         return atomic_read(&trace_count);
  16 }
  17
  18 static int trace_open(struct inode *inode, struct file *file)
  19 {
  20         atomic_inc(&trace_count);
  21         return single_open(file, trace_show, NULL);
  22 }
  23
  24 static int trace_release(struct inode *inode, struct file *file)
  25 {
  26         atomic_dec(&trace_count);
  27         return single_release(inode, file);
  28 }
  29
  30 static const struct file_operations trace_fops = {
  31         .open    = trace_open,
  32         .read    = seq_read,
  33         .llseek  = seq_lseek,
  34         .release = trace_release,
  35 };
  36
  37 int __init ras_add_daemon_trace(void)
  38 {
  39         struct dentry *fentry;
  40
  41         if (!ras_debugfs_dir)
  42                 return -ENOENT;
  43
  44         fentry = debugfs_create_file("daemon_active", S_IRUSR, ras_debugfs_dir,
  45                                      NULL, &trace_fops);
  46         if (!fentry)
  47                 return -ENODEV;
  48
  49         return 0;
  50
  51 }
  52
  53 void __init ras_debugfs_init(void)
  54 {
  55         ras_debugfs_dir = debugfs_create_dir("ras", NULL);
  56 }