drivers/edac/debugfs.c

   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 void 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         debugfs_create_x8(name, mode, parent, value);
 128 }
 129 EXPORT_SYMBOL_GPL(edac_debugfs_create_x8);
 130
 131 /* Wrapper for debugfs_create_x16() */
 132 void 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         debugfs_create_x16(name, mode, parent, value);
 139 }
 140 EXPORT_SYMBOL_GPL(edac_debugfs_create_x16);