These changes are the raw update to linux-4.4.6-rt14. Kernel sources

[kvmfornfv.git] / kernel / drivers / edac / debugfs.c

diff --git a/kernel/drivers/edac/debugfs.c b/kernel/drivers/edac/debugfs.c
new file mode 100644 (file)
index 0000000..54d2f66
--- /dev/null
+++ b/kernel/drivers/edac/debugfs.c
@@ -0,0 +1,163 @@
+#include "edac_module.h"
+
+static struct dentry *edac_debugfs;
+
+static ssize_t edac_fake_inject_write(struct file *file,
+                                     const char __user *data,
+                                     size_t count, loff_t *ppos)
+{
+       struct device *dev = file->private_data;
+       struct mem_ctl_info *mci = to_mci(dev);
+       static enum hw_event_mc_err_type type;
+       u16 errcount = mci->fake_inject_count;
+
+       if (!errcount)
+               errcount = 1;
+
+       type = mci->fake_inject_ue ? HW_EVENT_ERR_UNCORRECTED
+                                  : HW_EVENT_ERR_CORRECTED;
+
+       printk(KERN_DEBUG
+              "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",
+               errcount,
+               (type == HW_EVENT_ERR_UNCORRECTED) ? "UE" : "CE",
+               errcount > 1 ? "s" : "",
+               mci->fake_inject_layer[0],
+               mci->fake_inject_layer[1],
+               mci->fake_inject_layer[2]
+              );
+       edac_mc_handle_error(type, mci, errcount, 0, 0, 0,
+                            mci->fake_inject_layer[0],
+                            mci->fake_inject_layer[1],
+                            mci->fake_inject_layer[2],
+                            "FAKE ERROR", "for EDAC testing only");
+
+       return count;
+}
+
+static const struct file_operations debug_fake_inject_fops = {
+       .open = simple_open,
+       .write = edac_fake_inject_write,
+       .llseek = generic_file_llseek,
+};
+
+int __init edac_debugfs_init(void)
+{
+       edac_debugfs = debugfs_create_dir("edac", NULL);
+       if (IS_ERR(edac_debugfs)) {
+               edac_debugfs = NULL;
+               return -ENOMEM;
+       }
+       return 0;
+}
+
+void edac_debugfs_exit(void)
+{
+       debugfs_remove(edac_debugfs);
+}
+
+int edac_create_debugfs_nodes(struct mem_ctl_info *mci)
+{
+       struct dentry *d, *parent;
+       char name[80];
+       int i;
+
+       if (!edac_debugfs)
+               return -ENODEV;
+
+       d = debugfs_create_dir(mci->dev.kobj.name, edac_debugfs);
+       if (!d)
+               return -ENOMEM;
+       parent = d;
+
+       for (i = 0; i < mci->n_layers; i++) {
+               sprintf(name, "fake_inject_%s",
+                            edac_layer_name[mci->layers[i].type]);
+               d = debugfs_create_u8(name, S_IRUGO | S_IWUSR, parent,
+                                     &mci->fake_inject_layer[i]);
+               if (!d)
+                       goto nomem;
+       }
+
+       d = debugfs_create_bool("fake_inject_ue", S_IRUGO | S_IWUSR, parent,
+                               &mci->fake_inject_ue);
+       if (!d)
+               goto nomem;
+
+       d = debugfs_create_u16("fake_inject_count", S_IRUGO | S_IWUSR, parent,
+                               &mci->fake_inject_count);
+       if (!d)
+               goto nomem;
+
+       d = debugfs_create_file("fake_inject", S_IWUSR, parent,
+                               &mci->dev,
+                               &debug_fake_inject_fops);
+       if (!d)
+               goto nomem;
+
+       mci->debugfs = parent;
+       return 0;
+nomem:
+       edac_debugfs_remove_recursive(mci->debugfs);
+       return -ENOMEM;
+}
+
+/* Create a toplevel dir under EDAC's debugfs hierarchy */
+struct dentry *edac_debugfs_create_dir(const char *dirname)
+{
+       if (!edac_debugfs)
+               return NULL;
+
+       return debugfs_create_dir(dirname, edac_debugfs);
+}
+EXPORT_SYMBOL_GPL(edac_debugfs_create_dir);
+
+/* Create a toplevel dir under EDAC's debugfs hierarchy with parent @parent */
+struct dentry *
+edac_debugfs_create_dir_at(const char *dirname, struct dentry *parent)
+{
+       return debugfs_create_dir(dirname, parent);
+}
+EXPORT_SYMBOL_GPL(edac_debugfs_create_dir_at);
+
+/*
+ * Create a file under EDAC's hierarchy or a sub-hierarchy:
+ *
+ * @name: file name
+ * @mode: file permissions
+ * @parent: parent dentry. If NULL, it becomes the toplevel EDAC dir
+ * @data: private data of caller
+ * @fops: file operations of this file
+ */
+struct dentry *
+edac_debugfs_create_file(const char *name, umode_t mode, struct dentry *parent,
+                        void *data, const struct file_operations *fops)
+{
+       if (!parent)
+               parent = edac_debugfs;
+
+       return debugfs_create_file(name, mode, parent, data, fops);
+}
+EXPORT_SYMBOL_GPL(edac_debugfs_create_file);
+
+/* Wrapper for debugfs_create_x8() */
+struct dentry *edac_debugfs_create_x8(const char *name, umode_t mode,
+                                      struct dentry *parent, u8 *value)
+{
+       if (!parent)
+               parent = edac_debugfs;
+
+       return debugfs_create_x8(name, mode, parent, value);
+}
+EXPORT_SYMBOL_GPL(edac_debugfs_create_x8);
+
+/* Wrapper for debugfs_create_x16() */
+struct dentry *edac_debugfs_create_x16(const char *name, umode_t mode,
+                                      struct dentry *parent, u16 *value)
+{
+       if (!parent)
+               parent = edac_debugfs;
+
+       return debugfs_create_x16(name, mode, parent, value);
+}
+EXPORT_SYMBOL_GPL(edac_debugfs_create_x16);