path: root/drivers/edac/skx_edac.c

/*
 * EDAC driver for Intel(R) Xeon(R) Skylake processors
 * Copyright (c) 2016, Intel Corporation.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/pci_ids.h>
#include <linux/slab.h>
#include <linux/delay.h>
#include <linux/edac.h>
#include <linux/mmzone.h>
#include <linux/smp.h>
#include <linux/bitmap.h>
#include <linux/math64.h>
#include <linux/mod_devicetable.h>
#include <asm/cpu_device_id.h>
#include <asm/intel-family.h>
#include <asm/processor.h>
#include <asm/mce.h>

#include "edac_module.h"

#define SKX_REVISION    " Ver: 1.0 "

/*
 * Debug macros
 */
#define skx_printk(level, fmt, arg...)			\
	edac_printk(level, "skx", fmt, ##arg)

#define skx_mc_printk(mci, level, fmt, arg...)		\
	edac_mc_chipset_printk(mci, level, "skx", fmt, ##arg)

/*
 * Get a bit field at register value <v>, from bit <lo> to bit <hi>
 */
#define GET_BITFIELD(v, lo, hi) \
	(((v) & GENMASK_ULL((hi), (lo))) >> (lo))

static LIST_HEAD(skx_edac_list);

static u64 skx_tolm, skx_tohm;

#define NUM_IMC			2	/* memory controllers per socket */
#define NUM_CHANNELS		3	/* channels per memory controller */
#define NUM_DIMMS		2	/* Max DIMMS per channel */

#define	MASK26	0x3FFFFFF		/* Mask for 2^26 */
#define MASK29	0x1FFFFFFF		/* Mask for 2^29 */

/*
 * Each cpu socket contains some pci devices that provide global
 * information, and also some that are local to each of the two
 * memory controllers on the die.
 */
struct skx_dev {
	struct list_head	list;
	u8			bus[4];
	struct pci_dev	*sad_all;
	struct pci_dev	*util_all;
	u32	mcroute;
	struct skx_imc {
		struct mem_ctl_info *mci;
		u8	mc;	/* system wide mc# */
		u8	lmc;	/* socket relative mc# */
		u8	src_id, node_id;
		struct skx_channel {
			struct pci_dev *cdev;
			struct skx_dimm {
				u8	close_pg;
				u8	bank_xor_enable;
				u8	fine_grain_bank;
				u8	rowbits;
				u8	colbits;
			} dimms[NUM_DIMMS];
		} chan[NUM_CHANNELS];
	} imc[NUM_IMC];
};
static int skx_num_sockets;

struct skx_pvt {
	struct skx_imc	*imc;
};

struct decoded_addr {
	struct skx_dev *dev;
	u64	addr;
	int	socket;
	int	imc;
	int	channel;
	u64	chan_addr;
	int	sktways;
	int	chanways;
	int	dimm;
	int	rank;
	int	channel_rank;
	u64	rank_address;
	int	row;
	int	column;
	int	bank_address;
	int	bank_group;
};

static struct skx_dev *get_skx_dev(u8 bus, u8 idx)
{
	struct skx_dev *d;

	list_for_each_entry(d, &skx_edac_list, list) {
		if (d->bus[idx] == bus)
			return d;
	}

	return NULL;
}

enum munittype {
	CHAN0, CHAN1, CHAN2, SAD_ALL, UTIL_ALL, SAD
};

struct munit {
	u16	did;
	u16	devfn[NUM_IMC];
	u8	busidx;
	u8	per_socket;
	enum munittype mtype;
};

/*
 * List of PCI device ids that we need together with some device
 * number and function numbers to tell which memory controller the
 * device belongs to.
 */
static const struct munit skx_all_munits[] = {
	{ 0x2054, { }, 1, 1, SAD_ALL },
	{ 0x2055, { }, 1, 1, UTIL_ALL },
	{ 0x2040, { PCI_DEVFN(10, 0), PCI_DEVFN(12, 0) }, 2, 2, CHAN0 },
	{ 0x2044, { PCI_DEVFN(10, 4), PCI_DEVFN(12, 4) }, 2, 2, CHAN1 },
	{ 0x2048, { PCI_DEVFN(11, 0), PCI_DEVFN(13, 0) }, 2, 2, CHAN2 },
	{ 0x208e, { }, 1, 0, SAD },
	{ }
};

/*
 * We use the per-socket device 0x2016 to count how many sockets are present,
 * and to detemine which PCI buses are associated with each socket. Allocate
 * and build the full list of all the skx_dev structures that we need here.
 */
static int get_all_bus_mappings(void)
{
	struct pci_dev *pdev, *prev;
	struct skx_dev *d;
	u32 reg;
	int ndev = 0;

	prev = NULL;
	for (;;) {
		pdev = pci_get_device(PCI_VENDOR_ID_INTEL, 0x2016, prev);
		if (!pdev)
			break;
		ndev++;
		d = kzalloc(sizeof(*d), GFP_KERNEL);
		if (!d) {
			pci_dev_put(pdev);
			return -ENOMEM;
		}
		pci_read_config_dword(pdev, 0xCC, &reg);
		d->bus[0] =  GET_BITFIELD(reg, 0, 7);
		d->bus[1] =  GET_BITFIELD(reg, 8, 15);
		d-&