Linux-libre 4.4-gnupck-4.4-gnu

1 files changed, 163 insertions, 0 deletions

diff --git a/drivers/edac/debugfs.c b/drivers/edac/debugfs.c
new file mode 100644
index 000000000..54d2f668c
--- /dev/null
+++ b/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);