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 int __init edac_debugfs_init(void)
  45 {
  46         edac_debugfs = debugfs_create_dir("edac", NULL);
  47         if (IS_ERR(edac_debugfs)) {
  48                 edac_debugfs = NULL;
  49                 return -ENOMEM;
  50         }
  51         return 0;
  52 }
  53
  54 void edac_debugfs_exit(void)
  55 {
  56         debugfs_remove_recursive(edac_debugfs);
  57 }
  58
  59 int edac_create_debugfs_nodes(struct mem_ctl_info *mci)
  60 {
  61         struct dentry *d, *parent;
  62         char name[80];
  63         int i;
  64
  65         if (!edac_debugfs)
  66                 return -ENODEV;
  67
  68         d = debugfs_create_dir(mci->dev.kobj.name, edac_debugfs);
  69         if (!d)
  70                 return -ENOMEM;
  71         parent = d;
  72
  73         for (i = 0; i < mci->n_layers; i++) {
  74                 sprintf(name, "fake_inject_%s",
  75                              edac_layer_name[mci->layers[i].type]);
  76                 d = debugfs_create_u8(name, S_IRUGO | S_IWUSR, parent,
  77                                       &mci->fake_inject_layer[i]);
  78                 if (!d)
  79                         goto nomem;
  80         }
  81
  82         d = debugfs_create_bool("fake_inject_ue", S_IRUGO | S_IWUSR, parent,
  83                                 &mci->fake_inject_ue);
  84         if (!d)
  85                 goto nomem;
  86
  87         d = debugfs_create_u16("fake_inject_count", S_IRUGO | S_IWUSR, parent,
  88                                 &mci->fake_inject_count);
  89         if (!d)
  90                 goto nomem;
  91
  92         d = debugfs_create_file("fake_inject", S_IWUSR, parent,
  93                                 &mci->dev,
  94                                 &debug_fake_inject_fops);
  95         if (!d)
  96                 goto nomem;
  97
  98         mci->debugfs = parent;
  99         return 0;
 100 nomem:
 101         edac_debugfs_remove_recursive(mci->debugfs);
 102         return -ENOMEM;
 103 }
 104
 105 /* Create a toplevel dir under EDAC's debugfs hierarchy */
 106 struct dentry *edac_debugfs_create_dir(const char *dirname)
 107 {
 108         if (!edac_debugfs)
 109                 return NULL;
 110
 111         return debugfs_create_dir(dirname, edac_debugfs);
 112 }
 113 EXPORT_SYMBOL_GPL(edac_debugfs_create_dir);
 114
 115 /* Create a toplevel dir under EDAC's debugfs hierarchy with parent @parent */
 116 struct dentry *
 117 edac_debugfs_create_dir_at(const char *dirname, struct dentry *parent)
 118 {
 119         return debugfs_create_dir(dirname, parent);
 120 }
 121 EXPORT_SYMBOL_GPL(edac_debugfs_create_dir_at);
 122
 123 /*
 124  * Create a file under EDAC's hierarchy or a sub-hierarchy:
 125  *
 126  * @name: file name
 127  * @mode: file permissions
 128  * @parent: parent dentry. If NULL, it becomes the toplevel EDAC dir
 129  * @data: private data of caller
 130  * @fops: file operations of this file
 131  */
 132 struct dentry *
 133 edac_debugfs_create_file(const char *name, umode_t mode, struct dentry *parent,
 134                          void *data, const struct file_operations *fops)
 135 {
 136         if (!parent)
 137                 parent = edac_debugfs;
 138
 139         return debugfs_create_file(name, mode, parent, data, fops);
 140 }
 141 EXPORT_SYMBOL_GPL(edac_debugfs_create_file);
 142
 143 /* Wrapper for debugfs_create_x8() */
 144 struct dentry *edac_debugfs_create_x8(const char *name, umode_t mode,
 145                                        struct dentry *parent, u8 *value)
 146 {
 147         if (!parent)
 148                 parent = edac_debugfs;
 149
 150         return debugfs_create_x8(name, mode, parent, value);
 151 }
 152 EXPORT_SYMBOL_GPL(edac_debugfs_create_x8);
 153
 154 /* Wrapper for debugfs_create_x16() */
 155 struct dentry *edac_debugfs_create_x16(const char *name, umode_t mode,
 156                                        struct dentry *parent, u16 *value)
 157 {
 158         if (!parent)
 159                 parent = edac_debugfs;
 160
 161         return debugfs_create_x16(name, mode, parent, value);
 162 }
 163 EXPORT_SYMBOL_GPL(edac_debugfs_create_x16);