drivers/edac/debugfs.c

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