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 } 57