1 // SPDX-License-Identifier: GPL-2.0-only 2 #include <linux/debugfs.h> 3 #include <linux/ras.h> 4 #include "debugfs.h" 5 6 struct dentry *ras_debugfs_dir; 7 8 static atomic_t trace_count = ATOMIC_INIT(0); 9 10 int ras_userspace_consumers(void) 11 { 12 return atomic_read(&trace_count); 13 } 14 EXPORT_SYMBOL_GPL(ras_userspace_consumers); 15 16 static int trace_show(struct seq_file *m, void *v) 17 { 18 return 0; 19 } 20 21 static int trace_open(struct inode *inode, struct file *file) 22 { 23 atomic_inc(&trace_count); 24 return single_open(file, trace_show, NULL); 25 } 26 27 static int trace_release(struct inode *inode, struct file *file) 28 { 29 atomic_dec(&trace_count); 30 return single_release(inode, file); 31 } 32 33 static const struct file_operations trace_fops = { 34 .open = trace_open, 35 .read = seq_read, 36 .llseek = seq_lseek, 37 .release = trace_release, 38 }; 39 40 int __init ras_add_daemon_trace(void) 41 { 42 struct dentry *fentry; 43 44 if (!ras_debugfs_dir) 45 return -ENOENT; 46 47 fentry = debugfs_create_file("daemon_active", S_IRUSR, ras_debugfs_dir, 48 NULL, &trace_fops); 49 if (IS_ERR(fentry)) 50 return -ENODEV; 51 52 return 0; 53 54 } 55 56 void __init ras_debugfs_init(void) 57 { 58 ras_debugfs_dir = debugfs_create_dir("ras", NULL); 59 } 60