1 // SPDX-License-Identifier: GPL-2.0-only 2 3 #include <linux/string_choices.h> 4 5 #include "edac_module.h" 6 7 static struct dentry *edac_debugfs; 8 9 static ssize_t edac_fake_inject_write(struct file *file, 10 const char __user *data, 11 size_t count, loff_t *ppos) 12 { 13 struct device *dev = file->private_data; 14 struct mem_ctl_info *mci = to_mci(dev); 15 static enum hw_event_mc_err_type type; 16 u16 errcount = mci->fake_inject_count; 17 18 if (!errcount) 19 errcount = 1; 20 21 type = mci->fake_inject_ue ? HW_EVENT_ERR_UNCORRECTED 22 : HW_EVENT_ERR_CORRECTED; 23 24 printk(KERN_DEBUG 25 "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", 26 errcount, 27 (type == HW_EVENT_ERR_UNCORRECTED) ? "UE" : "CE", 28 str_plural(errcount), 29 mci->fake_inject_layer[0], 30 mci->fake_inject_layer[1], 31 mci->fake_inject_layer[2] 32 ); 33 edac_mc_handle_error(type, mci, errcount, 0, 0, 0, 34 mci->fake_inject_layer[0], 35 mci->fake_inject_layer[1], 36 mci->fake_inject_layer[2], 37 "FAKE ERROR", "for EDAC testing only"); 38 39 return count; 40 } 41 42 static const struct file_operations debug_fake_inject_fops = { 43 .open = simple_open, 44 .write = edac_fake_inject_write, 45 .llseek = generic_file_llseek, 46 }; 47 48 void __init edac_debugfs_init(void) 49 { 50 edac_debugfs = debugfs_create_dir("edac", NULL); 51 } 52 53 void edac_debugfs_exit(void) 54 { 55 debugfs_remove_recursive(edac_debugfs); 56 } 57 58 void edac_create_debugfs_nodes(struct mem_ctl_info *mci) 59 { 60 struct dentry *parent; 61 char name[80]; 62 int i; 63 64 parent = debugfs_create_dir(mci->dev.kobj.name, edac_debugfs); 65 66 for (i = 0; i < mci->n_layers; i++) { 67 sprintf(name, "fake_inject_%s", 68 edac_layer_name[mci->layers[i].type]); 69 debugfs_create_u8(name, S_IRUGO | S_IWUSR, parent, 70 &mci->fake_inject_layer[i]); 71 } 72 73 debugfs_create_bool("fake_inject_ue", S_IRUGO | S_IWUSR, parent, 74 &mci->fake_inject_ue); 75 76 debugfs_create_u16("fake_inject_count", S_IRUGO | S_IWUSR, parent, 77 &mci->fake_inject_count); 78 79 debugfs_create_file("fake_inject", S_IWUSR, parent, &mci->dev, 80 &debug_fake_inject_fops); 81 82 mci->debugfs = parent; 83 } 84 85 /* Create a toplevel dir under EDAC's debugfs hierarchy */ 86 struct dentry *edac_debugfs_create_dir(const char *dirname) 87 { 88 if (!edac_debugfs) 89 return NULL; 90 91 return debugfs_create_dir(dirname, edac_debugfs); 92 } 93 EXPORT_SYMBOL_GPL(edac_debugfs_create_dir); 94 95 /* Create a toplevel dir under EDAC's debugfs hierarchy with parent @parent */ 96 struct dentry * 97 edac_debugfs_create_dir_at(const char *dirname, struct dentry *parent) 98 { 99 return debugfs_create_dir(dirname, parent); 100 } 101 EXPORT_SYMBOL_GPL(edac_debugfs_create_dir_at); 102 103 /* 104 * Create a file under EDAC's hierarchy or a sub-hierarchy: 105 * 106 * @name: file name 107 * @mode: file permissions 108 * @parent: parent dentry. If NULL, it becomes the toplevel EDAC dir 109 * @data: private data of caller 110 * @fops: file operations of this file 111 */ 112 struct dentry * 113 edac_debugfs_create_file(const char *name, umode_t mode, struct dentry *parent, 114 void *data, const struct file_operations *fops) 115 { 116 if (!parent) 117 parent = edac_debugfs; 118 119 return debugfs_create_file(name, mode, parent, data, fops); 120 } 121 EXPORT_SYMBOL_GPL(edac_debugfs_create_file); 122 123 /* Wrapper for debugfs_create_x8() */ 124 void edac_debugfs_create_x8(const char *name, umode_t mode, 125 struct dentry *parent, u8 *value) 126 { 127 if (!parent) 128 parent = edac_debugfs; 129 130 debugfs_create_x8(name, mode, parent, value); 131 } 132 EXPORT_SYMBOL_GPL(edac_debugfs_create_x8); 133 134 /* Wrapper for debugfs_create_x16() */ 135 void edac_debugfs_create_x16(const char *name, umode_t mode, 136 struct dentry *parent, u16 *value) 137 { 138 if (!parent) 139 parent = edac_debugfs; 140 141 debugfs_create_x16(name, mode, parent, value); 142 } 143 EXPORT_SYMBOL_GPL(edac_debugfs_create_x16); 144 145 /* Wrapper for debugfs_create_x32() */ 146 void edac_debugfs_create_x32(const char *name, umode_t mode, 147 struct dentry *parent, u32 *value) 148 { 149 if (!parent) 150 parent = edac_debugfs; 151 152 debugfs_create_x32(name, mode, parent, value); 153 } 154 EXPORT_SYMBOL_GPL(edac_debugfs_create_x32); 155