1 // SPDX-License-Identifier: GPL-2.0-only 2 #include <linux/debugfs.h> 3 #include <linux/ras.h> 4 #include "debugfs.h" 5 6 static struct dentry *ras_debugfs_dir; 7 8 static atomic_t trace_count = ATOMIC_INIT(0); 9 10 struct dentry *ras_get_debugfs_root(void) 11 { 12 return ras_debugfs_dir; 13 } 14 EXPORT_SYMBOL_GPL(ras_get_debugfs_root); 15 16 int ras_userspace_consumers(void) 17 { 18 return atomic_read(&trace_count); 19 } 20 EXPORT_SYMBOL_GPL(ras_userspace_consumers); 21 22 static int trace_show(struct seq_file *m, void *v) 23 { 24 return 0; 25 } 26 27 static int trace_open(struct inode *inode, struct file *file) 28 { 29 atomic_inc(&trace_count); 30 return single_open(file, trace_show, NULL); 31 } 32 33 static int trace_release(struct inode *inode, struct file *file) 34 { 35 atomic_dec(&trace_count); 36 return single_release(inode, file); 37 } 38 39 static const struct file_operations trace_fops = { 40 .open = trace_open, 41 .read = seq_read, 42 .llseek = seq_lseek, 43 .release = trace_release, 44 }; 45 46 int __init ras_add_daemon_trace(void) 47 { 48 struct dentry *fentry; 49 50 if (!ras_debugfs_dir) 51 return -ENOENT; 52 53 fentry = debugfs_create_file("daemon_active", S_IRUSR, ras_debugfs_dir, 54 NULL, &trace_fops); 55 if (IS_ERR(fentry)) 56 return -ENODEV; 57 58 return 0; 59 60 } 61 62 void __init ras_debugfs_init(void) 63 { 64 ras_debugfs_dir = debugfs_create_dir("ras", NULL); 65 } 66