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diff --git a/drivers/edac/edac_mc.h b/drivers/edac/edac_mc.h
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+/*
+ * Defines, structures, APIs for edac_mc module
+ *
+ * (C) 2007 Linux Networx (http://lnxi.com)
+ * This file may be distributed under the terms of the
+ * GNU General Public License.
+ *
+ * Written by Thayne Harbaugh
+ * Based on work by Dan Hollis <goemon at anime dot net> and others.
+ * http://www.anime.net/~goemon/linux-ecc/
+ *
+ * NMI handling support added by
+ * Dave Peterson <dsp@llnl.gov> <dave_peterson@pobox.com>
+ *
+ * Refactored for multi-source files:
+ * Doug Thompson <norsk5@xmission.com>
+ *
+ * Please look at Documentation/driver-api/edac.rst for more info about
+ * EDAC core structs and functions.
+ */
+
+#ifndef _EDAC_MC_H_
+#define _EDAC_MC_H_
+
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/module.h>
+#include <linux/spinlock.h>
+#include <linux/smp.h>
+#include <linux/pci.h>
+#include <linux/time.h>
+#include <linux/nmi.h>
+#include <linux/rcupdate.h>
+#include <linux/completion.h>
+#include <linux/kobject.h>
+#include <linux/platform_device.h>
+#include <linux/workqueue.h>
+#include <linux/edac.h>
+
+#if PAGE_SHIFT < 20
+#define PAGES_TO_MiB(pages) ((pages) >> (20 - PAGE_SHIFT))
+#define MiB_TO_PAGES(mb) ((mb) << (20 - PAGE_SHIFT))
+#else /* PAGE_SHIFT > 20 */
+#define PAGES_TO_MiB(pages) ((pages) << (PAGE_SHIFT - 20))
+#define MiB_TO_PAGES(mb) ((mb) >> (PAGE_SHIFT - 20))
+#endif
+
+#define edac_printk(level, prefix, fmt, arg...) \
+ printk(level "EDAC " prefix ": " fmt, ##arg)
+
+#define edac_mc_printk(mci, level, fmt, arg...) \
+ printk(level "EDAC MC%d: " fmt, mci->mc_idx, ##arg)
+
+#define edac_mc_chipset_printk(mci, level, prefix, fmt, arg...) \
+ printk(level "EDAC " prefix " MC%d: " fmt, mci->mc_idx, ##arg)
+
+#define edac_device_printk(ctl, level, fmt, arg...) \
+ printk(level "EDAC DEVICE%d: " fmt, ctl->dev_idx, ##arg)
+
+#define edac_pci_printk(ctl, level, fmt, arg...) \
+ printk(level "EDAC PCI%d: " fmt, ctl->pci_idx, ##arg)
+
+/* prefixes for edac_printk() and edac_mc_printk() */
+#define EDAC_MC "MC"
+#define EDAC_PCI "PCI"
+#define EDAC_DEBUG "DEBUG"
+
+extern const char * const edac_mem_types[];
+
+#ifdef CONFIG_EDAC_DEBUG
+extern int edac_debug_level;
+
+#define edac_dbg(level, fmt, ...) \
+do { \
+ if (level <= edac_debug_level) \
+ edac_printk(KERN_DEBUG, EDAC_DEBUG, \
+ "%s: " fmt, __func__, ##__VA_ARGS__); \
+} while (0)
+
+#else /* !CONFIG_EDAC_DEBUG */
+
+#define edac_dbg(level, fmt, ...) \
+do { \
+ if (0) \
+ edac_printk(KERN_DEBUG, EDAC_DEBUG, \
+ "%s: " fmt, __func__, ##__VA_ARGS__); \
+} while (0)
+
+#endif /* !CONFIG_EDAC_DEBUG */
+
+#define PCI_VEND_DEV(vend, dev) PCI_VENDOR_ID_ ## vend, \
+ PCI_DEVICE_ID_ ## vend ## _ ## dev
+
+#define edac_dev_name(dev) (dev)->dev_name
+
+#define to_mci(k) container_of(k, struct mem_ctl_info, dev)
+
+/**
+ * edac_mc_alloc() - Allocate and partially fill a struct &mem_ctl_info.
+ *
+ * @mc_num: Memory controller number
+ * @n_layers: Number of MC hierarchy layers
+ * @layers: Describes each layer as seen by the Memory Controller
+ * @sz_pvt: size of private storage needed
+ *
+ *
+ * Everything is kmalloc'ed as one big chunk - more efficient.
+ * Only can be used if all structures have the same lifetime - otherwise
+ * you have to allocate and initialize your own structures.
+ *
+ * Use edac_mc_free() to free mc structures allocated by this function.
+ *
+ * .. note::
+ *
+ * drivers handle multi-rank memories in different ways: in some
+ * drivers, one multi-rank memory stick is mapped as one entry, while, in
+ * others, a single multi-rank memory stick would be mapped into several
+ * entries. Currently, this function will allocate multiple struct dimm_info
+ * on such scenarios, as grouping the multiple ranks require drivers change.
+ *
+ * Returns:
+ * On success, return a pointer to struct mem_ctl_info pointer;
+ * %NULL otherwise
+ */
+struct mem_ctl_info *edac_mc_alloc(unsigned int mc_num,
+ unsigned int n_layers,
+ struct edac_mc_layer *layers,
+ unsigned int sz_pvt);
+
+/**
+ * edac_get_owner - Return the owner's mod_name of EDAC MC
+ *
+ * Returns:
+ * Pointer to mod_name string when EDAC MC is owned. NULL otherwise.
+ */
+extern const char *edac_get_owner(void);
+
+/*
+ * edac_mc_add_mc_with_groups() - Insert the @mci structure into the mci
+ * global list and create sysfs entries associated with @mci structure.
+ *
+ * @mci: pointer to the mci structure to be added to the list
+ * @groups: optional attribute groups for the driver-specific sysfs entries
+ *
+ * Returns:
+ * 0 on Success, or an error code on failure
+ */
+extern int edac_mc_add_mc_with_groups(struct mem_ctl_info *mci,
+ const struct attribute_group **groups);
+#define edac_mc_add_mc(mci) edac_mc_add_mc_with_groups(mci, NULL)
+
+/**
+ * edac_mc_free() - Frees a previously allocated @mci structure
+ *
+ * @mci: pointer to a struct mem_ctl_info structure
+ */
+extern void edac_mc_free(struct mem_ctl_info *mci);
+
+/**
+ * edac_has_mcs() - Check if any MCs have been allocated.
+ *
+ * Returns:
+ * True if MC instances have been registered successfully.
+ * False otherwise.
+ */
+extern bool edac_has_mcs(void);
+
+/**
+ * edac_mc_find() - Search for a mem_ctl_info structure whose index is @idx.
+ *
+ * @idx: index to be seek
+ *
+ * If found, return a pointer to the structure.
+ * Else return NULL.
+ */
+extern struct mem_ctl_info *edac_mc_find(int idx);
+
+/**
+ * find_mci_by_dev() - Scan list of controllers looking for the one that
+ * manages the @dev device.
+ *
+ * @dev: pointer to a struct device related with the MCI
+ *
+ * Returns: on success, returns a pointer to struct &mem_ctl_info;
+ * %NULL otherwise.
+ */
+extern struct mem_ctl_info *find_mci_by_dev(struct device *dev);
+
+/**
+ * edac_mc_del_mc() - Remove sysfs entries for mci structure associated with
+ * @dev and remove mci structure from global list.
+ *
+ * @dev: Pointer to struct &device representing mci structure to remove.
+ *
+ * Returns: pointer to removed mci structure, or %NULL if device not found.
+ */
+extern struct mem_ctl_info *edac_mc_del_mc(struct device *dev);
+
+/**
+ * edac_mc_find_csrow_by_page() - Ancillary routine to identify what csrow
+ * contains a memory page.
+ *
+ * @mci: pointer to a struct mem_ctl_info structure
+ * @page: memory page to find
+ *
+ * Returns: on success, returns the csrow. -1 if not found.
+ */
+extern int edac_mc_find_csrow_by_page(struct mem_ctl_info *mci,
+ unsigned long page);
+
+/**
+ * edac_raw_mc_handle_error() - Reports a memory event to userspace without
+ * doing anything to discover the error location.
+ *
+ * @e: error description
+ *
+ * This raw function is used internally by edac_mc_handle_error(). It should
+ * only be called directly when the hardware error come directly from BIOS,
+ * like in the case of APEI GHES driver.
+ */
+void edac_raw_mc_handle_error(struct edac_raw_error_desc *e);
+
+/**
+ * edac_mc_handle_error() - Reports a memory event to userspace.
+ *
+ * @type: severity of the error (CE/UE/Fatal)
+ * @mci: a struct mem_ctl_info pointer
+ * @error_count: Number of errors of the same type
+ * @page_frame_number: mem page where the error occurred
+ * @offset_in_page: offset of the error inside the page
+ * @syndrome: ECC syndrome
+ * @top_layer: Memory layer[0] position
+ * @mid_layer: Memory layer[1] position
+ * @low_layer: Memory layer[2] position
+ * @msg: Message meaningful to the end users that
+ * explains the event
+ * @other_detail: Technical details about the event that
+ * may help hardware manufacturers and
+ * EDAC developers to analyse the event
+ */
+void edac_mc_handle_error(const enum hw_event_mc_err_type type,
+ struct mem_ctl_info *mci,
+ const u16 error_count,
+ const unsigned long page_frame_number,
+ const unsigned long offset_in_page,
+ const unsigned long syndrome,
+ const int top_layer,
+ const int mid_layer,
+ const int low_layer,
+ const char *msg,
+ const char *other_detail);
+
+/*
+ * edac misc APIs
+ */
+extern char *edac_op_state_to_string(int op_state);
+
+#endif /* _EDAC_MC_H_ */