1 // SPDX-License-Identifier: GPL-2.0-only 2 #include "edac_module.h" 3 4 static struct dentry *edac_debugfs; 5 6 static ssize_t edac_fake_inject_write(struct file *file, 7 const char __user *data, 8 size_t count, loff_t *ppos) 9 { 10 struct device *dev = file->private_data; 11 struct mem_ctl_info *mci = to_mci(dev); 12 static enum hw_event_mc_err_type type; 13 u16 errcount = mci->fake_inject_count; 14 15 if (!errcount) 16 errcount = 1; 17 18 type = mci->fake_inject_ue ? HW_EVENT_ERR_UNCORRECTED 19 : HW_EVENT_ERR_CORRECTED; 20 21 printk(KERN_DEBUG 22 "Generating %d %s fake error%s to %d.%d.%d to test core handling. NOTE: this won't test the driver-specific decoding logic.\n", 23 errcount, 24 (type == HW_EVENT_ERR_UNCORRECTED) ? "UE" : "CE", 25 errcount > 1 ? "s" : "", 26 mci->fake_inject_layer[0], 27 mci->fake_inject_layer[1], 28 mci->fake_inject_layer[2] 29 ); 30 edac_mc_handle_error(type, mci, errcount, 0, 0, 0, 31 mci->fake_inject_layer[0], 32 mci->fake_inject_layer[1], 33 mci->fake_inject_layer[2], 34 "FAKE ERROR", "for EDAC testing only"); 35 36 return count; 37 } 38 39 static const struct file_operations debug_fake_inject_fops = { 40 .open = simple_open, 41 .write = edac_fake_inject_write, 42 .llseek = generic_file_llseek, 43 }; 44 45 void __init edac_debugfs_init(void) 46 { 47 edac_debugfs = debugfs_create_dir("edac", NULL); 48 } 49 50 void edac_debugfs_exit(void) 51 { 52 debugfs_remove_recursive(edac_debugfs); 53 } 54 55 void edac_create_debugfs_nodes(struct mem_ctl_info *mci) 56 { 57 struct dentry *parent; 58 char name[80]; 59 int i; 60 61 parent = debugfs_create_dir(mci->dev.kobj.name, edac_debugfs); 62 63 for (i = 0; i < mci->n_layers; i++) { 64 sprintf(name, "fake_inject_%s", 65 edac_layer_name[mci->layers[i].type]); 66 debugfs_create_u8(name, S_IRUGO | S_IWUSR, parent, 67 &mci->fake_inject_layer[i]); 68 } 69 70 debugfs_create_bool("fake_inject_ue", S_IRUGO | S_IWUSR, parent, 71 &mci->fake_inject_ue); 72 73 debugfs_create_u16("fake_inject_count", S_IRUGO | S_IWUSR, parent, 74 &mci->fake_inject_count); 75 76 debugfs_create_file("fake_inject", S_IWUSR, parent, &mci->dev, 77 &debug_fake_inject_fops); 78 79 mci->debugfs = parent; 80 } 81 82 /* Create a toplevel dir under EDAC's debugfs hierarchy */ 83 struct dentry *edac_debugfs_create_dir(const char *dirname) 84 { 85 if (!edac_debugfs) 86 return NULL; 87 88 return debugfs_create_dir(dirname, edac_debugfs); 89 } 90 EXPORT_SYMBOL_GPL(edac_debugfs_create_dir); 91 92 /* Create a toplevel dir under EDAC's debugfs hierarchy with parent @parent */ 93 struct dentry * 94 edac_debugfs_create_dir_at(const char *dirname, struct dentry *parent) 95 { 96 return debugfs_create_dir(dirname, parent); 97 } 98 EXPORT_SYMBOL_GPL(edac_debugfs_create_dir_at); 99 100 /* 101 * Create a file under EDAC's hierarchy or a sub-hierarchy: 102 * 103 * @name: file name 104 * @mode: file permissions 105 * @parent: parent dentry. If NULL, it becomes the toplevel EDAC dir 106 * @data: private data of caller 107 * @fops: file operations of this file 108 */ 109 struct dentry * 110 edac_debugfs_create_file(const char *name, umode_t mode, struct dentry *parent, 111 void *data, const struct file_operations *fops) 112 { 113 if (!parent) 114 parent = edac_debugfs; 115 116 return debugfs_create_file(name, mode, parent, data, fops); 117 } 118 EXPORT_SYMBOL_GPL(edac_debugfs_create_file); 119 120 /* Wrapper for debugfs_create_x8() */ 121 struct dentry *edac_debugfs_create_x8(const char *name, umode_t mode, 122 struct dentry *parent, u8 *value) 123 { 124 if (!parent) 125 parent = edac_debugfs; 126 127 return debugfs_create_x8(name, mode, parent, value); 128 } 129 EXPORT_SYMBOL_GPL(edac_debugfs_create_x8); 130 131 /* Wrapper for debugfs_create_x16() */ 132 struct dentry *edac_debugfs_create_x16(const char *name, umode_t mode, 133 struct dentry *parent, u16 *value) 134 { 135 if (!parent) 136 parent = edac_debugfs; 137 138 return debugfs_create_x16(name, mode, parent, value); 139 } 140 EXPORT_SYMBOL_GPL(edac_debugfs_create_x16); 141