// SPDX-License-Identifier: GPL-2.0-only

  /* Intel i7 core/Nehalem Memory Controller kernel module
   *

   * This driver supports the memory controllers found on the Intel

   * processor families i7core, i7core 7xx/8xx, i5core, Xeon 35xx,
   * Xeon 55xx and Xeon 56xx also known as Nehalem, Nehalem-EP, Lynnfield
   * and Westmere-EP.

   *

   * Copyright (c) 2009-2010 by:

   *	 Mauro Carvalho Chehab

   *

   * Red Hat Inc. https://www.redhat.com

   *
   * Forked and adapted from the i5400_edac driver
   *
   * Based on the following public Intel datasheets:
   * Intel Core i7 Processor Extreme Edition and Intel Core i7 Processor
   * Datasheet, Volume 2:
   *	http://download.intel.com/design/processor/datashts/320835.pdf
   * Intel Xeon Processor 5500 Series Datasheet Volume 2
   *	http://www.intel.com/Assets/PDF/datasheet/321322.pdf
   * also available at:
   * 	http://www.arrownac.com/manufacturers/intel/s/nehalem/5500-datasheet-v2.pdf
   */

  #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/dmi.h>

  #include <linux/edac.h>
  #include <linux/mmzone.h>

  #include <linux/smp.h>

  #include <asm/mce.h>

  #include <asm/processor.h>

  #include <asm/div64.h>

  #include "edac_module.h"

  /* Static vars */
  static LIST_HEAD(i7core_edac_list);
  static DEFINE_MUTEX(i7core_edac_lock);
  static int probed;

  static int use_pci_fixup;
  module_param(use_pci_fixup, int, 0444);
  MODULE_PARM_DESC(use_pci_fixup, "Enable PCI fixup to seek for hidden devices");

  /*

   * This is used for Nehalem-EP and Nehalem-EX devices, where the non-core
   * registers start at bus 255, and are not reported by BIOS.
   * We currently find devices with only 2 sockets. In order to support more QPI
   * Quick Path Interconnect, just increment this number.
   */
  #define MAX_SOCKET_BUSES	2
  
  
  /*

   * Alter this version for the module when modifications are made
   */

  #define I7CORE_REVISION    " Ver: 1.0.0"

  #define EDAC_MOD_STR      "i7core_edac"

  /*
   * Debug macros
   */
  #define i7core_printk(level, fmt, arg...)			\
  	edac_printk(level, "i7core", fmt, ##arg)
  
  #define i7core_mc_printk(mci, level, fmt, arg...)		\
  	edac_mc_chipset_printk(mci, level, "i7core", fmt, ##arg)
  
  /*
   * i7core Memory Controller Registers
   */

  	/* OFFSETS for Device 0 Function 0 */
  
  #define MC_CFG_CONTROL	0x90

    #define MC_CFG_UNLOCK		0x02
    #define MC_CFG_LOCK		0x00

  	/* OFFSETS for Device 3 Function 0 */
  
  #define MC_CONTROL	0x48
  #define MC_STATUS	0x4c
  #define MC_MAX_DOD	0x64

  /*

   * OFFSETS for Device 3 Function 4, as indicated on Xeon 5500 datasheet:

   * http://www.arrownac.com/manufacturers/intel/s/nehalem/5500-datasheet-v2.pdf
   */
  
  #define MC_TEST_ERR_RCV1	0x60
    #define DIMM2_COR_ERR(r)			((r) & 0x7fff)
  
  #define MC_TEST_ERR_RCV0	0x64
    #define DIMM1_COR_ERR(r)			(((r) >> 16) & 0x7fff)
    #define DIMM0_COR_ERR(r)			((r) & 0x7fff)

  /* OFFSETS for Device 3 Function 2, as indicated on Xeon 5500 datasheet */

  #define MC_SSRCONTROL		0x48
    #define SSR_MODE_DISABLE	0x00
    #define SSR_MODE_ENABLE	0x01
    #define SSR_MODE_MASK		0x03
  
  #define MC_SCRUB_CONTROL	0x4c
    #define STARTSCRUB		(1 << 24)

    #define SCRUBINTERVAL_MASK    0xffffff

  #define MC_COR_ECC_CNT_0	0x80
  #define MC_COR_ECC_CNT_1	0x84
  #define MC_COR_ECC_CNT_2	0x88
  #define MC_COR_ECC_CNT_3	0x8c
  #define MC_COR_ECC_CNT_4	0x90
  #define MC_COR_ECC_CNT_5	0x94
  
  #define DIMM_TOP_COR_ERR(r)			(((r) >> 16) & 0x7fff)
  #define DIMM_BOT_COR_ERR(r)			((r) & 0x7fff)

  	/* OFFSETS for Devices 4,5 and 6 Function 0 */

  #define MC_CHANNEL_DIMM_INIT_PARAMS 0x58
    #define THREE_DIMMS_PRESENT		(1 << 24)
    #define SINGLE_QUAD_RANK_PRESENT	(1 << 23)
    #define QUAD_RANK_PRESENT		(1 << 22)
    #define REGISTERED_DIMM		(1 << 15)

  #define MC_CHANNEL_MAPPER	0x60
    #define RDLCH(r, ch)		((((r) >> (3 + (ch * 6))) & 0x07) - 1)
    #define WRLCH(r, ch)		((((r) >> (ch * 6)) & 0x07) - 1)

  #define MC_CHANNEL_RANK_PRESENT 0x7c
    #define RANK_PRESENT_MASK		0xffff

  #define MC_CHANNEL_ADDR_MATCH	0xf0

  #define MC_CHANNEL_ERROR_MASK	0xf8
  #define MC_CHANNEL_ERROR_INJECT	0xfc
    #define INJECT_ADDR_PARITY	0x10
    #define INJECT_ECC		0x08
    #define MASK_CACHELINE	0x06
    #define MASK_FULL_CACHELINE	0x06
    #define MASK_MSB32_CACHELINE	0x04
    #define MASK_LSB32_CACHELINE	0x02
    #define NO_MASK_CACHELINE	0x00
    #define REPEAT_EN		0x01

  	/* OFFSETS for Devices 4,5 and 6 Function 1 */

  #define MC_DOD_CH_DIMM0		0x48
  #define MC_DOD_CH_DIMM1		0x4c
  #define MC_DOD_CH_DIMM2		0x50
    #define RANKOFFSET_MASK	((1 << 12) | (1 << 11) | (1 << 10))
    #define RANKOFFSET(x)		((x & RANKOFFSET_MASK) >> 10)
    #define DIMM_PRESENT_MASK	(1 << 9)
    #define DIMM_PRESENT(x)	(((x) & DIMM_PRESENT_MASK) >> 9)

    #define MC_DOD_NUMBANK_MASK		((1 << 8) | (1 << 7))
    #define MC_DOD_NUMBANK(x)		(((x) & MC_DOD_NUMBANK_MASK) >> 7)
    #define MC_DOD_NUMRANK_MASK		((1 << 6) | (1 << 5))
    #define MC_DOD_NUMRANK(x)		(((x) & MC_DOD_NUMRANK_MASK) >> 5)

    #define MC_DOD_NUMROW_MASK		((1 << 4) | (1 << 3) | (1 << 2))

    #define MC_DOD_NUMROW(x)		(((x) & MC_DOD_NUMROW_MASK) >> 2)

    #define MC_DOD_NUMCOL_MASK		3
    #define MC_DOD_NUMCOL(x)		((x) & MC_DOD_NUMCOL_MASK)

  #define MC_RANK_PRESENT		0x7c

  #define MC_SAG_CH_0	0x80
  #define MC_SAG_CH_1	0x84
  #define MC_SAG_CH_2	0x88
  #define MC_SAG_CH_3	0x8c
  #define MC_SAG_CH_4	0x90
  #define MC_SAG_CH_5	0x94
  #define MC_SAG_CH_6	0x98
  #define MC_SAG_CH_7	0x9c
  
  #define MC_RIR_LIMIT_CH_0	0x40
  #define MC_RIR_LIMIT_CH_1	0x44
  #define MC_RIR_LIMIT_CH_2	0x48
  #define MC_RIR_LIMIT_CH_3	0x4C
  #define MC_RIR_LIMIT_CH_4	0x50
  #define MC_RIR_LIMIT_CH_5	0x54
  #define MC_RIR_LIMIT_CH_6	0x58
  #define MC_RIR_LIMIT_CH_7	0x5C
  #define MC_RIR_LIMIT_MASK	((1 << 10) - 1)
  
  #define MC_RIR_WAY_CH		0x80
    #define MC_RIR_WAY_OFFSET_MASK	(((1 << 14) - 1) & ~0x7)
    #define MC_RIR_WAY_RANK_MASK		0x7

  /*
   * i7core structs
   */
  
  #define NUM_CHANS 3

  #define MAX_DIMMS 3		/* Max DIMMS per channel */
  #define MAX_MCR_FUNC  4
  #define MAX_CHAN_FUNC 3

  
  struct i7core_info {
  	u32	mc_control;
  	u32	mc_status;
  	u32	max_dod;

  	u32	ch_map;

  };

  
  struct i7core_inject {
  	int	enable;
  
  	u32	section;
  	u32	type;
  	u32	eccmask;
  
  	/* Error address mask */
  	int channel, dimm, rank, bank, page, col;
  };

  struct i7core_channel {

  	bool		is_3dimms_present;
  	bool		is_single_4rank;
  	bool		has_4rank;

  	u32		dimms;

  };

  struct pci_id_descr {

  	int			dev;
  	int			func;
  	int 			dev_id;

  	int			optional;

  };

  struct pci_id_table {

  	const struct pci_id_descr	*descr;
  	int				n_devs;

  };

  struct i7core_dev {
  	struct list_head	list;
  	u8			socket;
  	struct pci_dev		**pdev;

  	int			n_devs;

  	struct mem_ctl_info	*mci;
  };

  struct i7core_pvt {

  	struct device *addrmatch_dev, *chancounts_dev;

  	struct pci_dev	*pci_noncore;
  	struct pci_dev	*pci_mcr[MAX_MCR_FUNC + 1];
  	struct pci_dev	*pci_ch[NUM_CHANS][MAX_CHAN_FUNC + 1];
  
  	struct i7core_dev *i7core_dev;

  	struct i7core_info	info;

  	struct i7core_inject	inject;

  	struct i7core_channel	channel[NUM_CHANS];

  	int		ce_count_available;

  
  			/* ECC corrected errors counts per udimm */

  	unsigned long	udimm_ce_count[MAX_DIMMS];
  	int		udimm_last_ce_count[MAX_DIMMS];

  			/* ECC corrected errors counts per rdimm */

  	unsigned long	rdimm_ce_count[NUM_CHANS][MAX_DIMMS];
  	int		rdimm_last_ce_count[NUM_CHANS][MAX_DIMMS];

  	bool		is_registered, enable_scrub;

  	/* DCLK Frequency used for computing scrub rate */
  	int			dclk_freq;

  	/* Struct to control EDAC polling */
  	struct edac_pci_ctl_info *i7core_pci;

  };

  #define PCI_DESCR(device, function, device_id)	\
  	.dev = (device),			\
  	.func = (function),			\
  	.dev_id = (device_id)

  static const struct pci_id_descr pci_dev_descr_i7core_nehalem[] = {

  		/* Memory controller */
  	{ PCI_DESCR(3, 0, PCI_DEVICE_ID_INTEL_I7_MCR)     },
  	{ PCI_DESCR(3, 1, PCI_DEVICE_ID_INTEL_I7_MC_TAD)  },

  			/* Exists only for RDIMM */

  	{ PCI_DESCR(3, 2, PCI_DEVICE_ID_INTEL_I7_MC_RAS), .optional = 1  },

  	{ PCI_DESCR(3, 4, PCI_DEVICE_ID_INTEL_I7_MC_TEST) },
  
  		/* Channel 0 */
  	{ PCI_DESCR(4, 0, PCI_DEVICE_ID_INTEL_I7_MC_CH0_CTRL) },
  	{ PCI_DESCR(4, 1, PCI_DEVICE_ID_INTEL_I7_MC_CH0_ADDR) },
  	{ PCI_DESCR(4, 2, PCI_DEVICE_ID_INTEL_I7_MC_CH0_RANK) },
  	{ PCI_DESCR(4, 3, PCI_DEVICE_ID_INTEL_I7_MC_CH0_TC)   },
  
  		/* Channel 1 */
  	{ PCI_DESCR(5, 0, PCI_DEVICE_ID_INTEL_I7_MC_CH1_CTRL) },
  	{ PCI_DESCR(5, 1, PCI_DEVICE_ID_INTEL_I7_MC_CH1_ADDR) },
  	{ PCI_DESCR(5, 2, PCI_DEVICE_ID_INTEL_I7_MC_CH1_RANK) },
  	{ PCI_DESCR(5, 3, PCI_DEVICE_ID_INTEL_I7_MC_CH1_TC)   },
  
  		/* Channel 2 */
  	{ PCI_DESCR(6, 0, PCI_DEVICE_ID_INTEL_I7_MC_CH2_CTRL) },
  	{ PCI_DESCR(6, 1, PCI_DEVICE_ID_INTEL_I7_MC_CH2_ADDR) },
  	{ PCI_DESCR(6, 2, PCI_DEVICE_ID_INTEL_I7_MC_CH2_RANK) },
  	{ PCI_DESCR(6, 3, PCI_DEVICE_ID_INTEL_I7_MC_CH2_TC)   },

  
  		/* Generic Non-core registers */
  	/*
  	 * This is the PCI device on i7core and on Xeon 35xx (8086:2c41)
  	 * On Xeon 55xx, however, it has a different id (8086:2c40). So,
  	 * the probing code needs to test for the other address in case of
  	 * failure of this one
  	 */
  	{ PCI_DESCR(0, 0, PCI_DEVICE_ID_INTEL_I7_NONCORE)  },

  };

  static const struct pci_id_descr pci_dev_descr_lynnfield[] = {

  	{ PCI_DESCR( 3, 0, PCI_DEVICE_ID_INTEL_LYNNFIELD_MCR)         },
  	{ PCI_DESCR( 3, 1, PCI_DEVICE_ID_INTEL_LYNNFIELD_MC_TAD)      },
  	{ PCI_DESCR( 3, 4, PCI_DEVICE_ID_INTEL_LYNNFIELD_MC_TEST)     },
  
  	{ PCI_DESCR( 4, 0, PCI_DEVICE_ID_INTEL_LYNNFIELD_MC_CH0_CTRL) },
  	{ PCI_DESCR( 4, 1, PCI_DEVICE_ID_INTEL_LYNNFIELD_MC_CH0_ADDR) },
  	{ PCI_DESCR( 4, 2, PCI_DEVICE_ID_INTEL_LYNNFIELD_MC_CH0_RANK) },
  	{ PCI_DESCR( 4, 3, PCI_DEVICE_ID_INTEL_LYNNFIELD_MC_CH0_TC)   },

  	{ PCI_DESCR( 5, 0, PCI_DEVICE_ID_INTEL_LYNNFIELD_MC_CH1_CTRL) },
  	{ PCI_DESCR( 5, 1, PCI_DEVICE_ID_INTEL_LYNNFIELD_MC_CH1_ADDR) },
  	{ PCI_DESCR( 5, 2, PCI_DEVICE_ID_INTEL_LYNNFIELD_MC_CH1_RANK) },
  	{ PCI_DESCR( 5, 3, PCI_DEVICE_ID_INTEL_LYNNFIELD_MC_CH1_TC)   },

  
  	/*
  	 * This is the PCI device has an alternate address on some
  	 * processors like Core i7 860
  	 */
  	{ PCI_DESCR( 0, 0, PCI_DEVICE_ID_INTEL_LYNNFIELD_NONCORE)     },

  };

  static const struct pci_id_descr pci_dev_descr_i7core_westmere[] = {

  		/* Memory controller */
  	{ PCI_DESCR(3, 0, PCI_DEVICE_ID_INTEL_LYNNFIELD_MCR_REV2)     },
  	{ PCI_DESCR(3, 1, PCI_DEVICE_ID_INTEL_LYNNFIELD_MC_TAD_REV2)  },
  			/* Exists only for RDIMM */
  	{ PCI_DESCR(3, 2, PCI_DEVICE_ID_INTEL_LYNNFIELD_MC_RAS_REV2), .optional = 1  },
  	{ PCI_DESCR(3, 4, PCI_DEVICE_ID_INTEL_LYNNFIELD_MC_TEST_REV2) },
  
  		/* Channel 0 */
  	{ PCI_DESCR(4, 0, PCI_DEVICE_ID_INTEL_LYNNFIELD_MC_CH0_CTRL_REV2) },
  	{ PCI_DESCR(4, 1, PCI_DEVICE_ID_INTEL_LYNNFIELD_MC_CH0_ADDR_REV2) },
  	{ PCI_DESCR(4, 2, PCI_DEVICE_ID_INTEL_LYNNFIELD_MC_CH0_RANK_REV2) },
  	{ PCI_DESCR(4, 3, PCI_DEVICE_ID_INTEL_LYNNFIELD_MC_CH0_TC_REV2)   },
  
  		/* Channel 1 */
  	{ PCI_DESCR(5, 0, PCI_DEVICE_ID_INTEL_LYNNFIELD_MC_CH1_CTRL_REV2) },
  	{ PCI_DESCR(5, 1, PCI_DEVICE_ID_INTEL_LYNNFIELD_MC_CH1_ADDR_REV2) },
  	{ PCI_DESCR(5, 2, PCI_DEVICE_ID_INTEL_LYNNFIELD_MC_CH1_RANK_REV2) },
  	{ PCI_DESCR(5, 3, PCI_DEVICE_ID_INTEL_LYNNFIELD_MC_CH1_TC_REV2)   },
  
  		/* Channel 2 */
  	{ PCI_DESCR(6, 0, PCI_DEVICE_ID_INTEL_LYNNFIELD_MC_CH2_CTRL_REV2) },
  	{ PCI_DESCR(6, 1, PCI_DEVICE_ID_INTEL_LYNNFIELD_MC_CH2_ADDR_REV2) },
  	{ PCI_DESCR(6, 2, PCI_DEVICE_ID_INTEL_LYNNFIELD_MC_CH2_RANK_REV2) },
  	{ PCI_DESCR(6, 3, PCI_DEVICE_ID_INTEL_LYNNFIELD_MC_CH2_TC_REV2)   },

  
  		/* Generic Non-core registers */
  	{ PCI_DESCR(0, 0, PCI_DEVICE_ID_INTEL_LYNNFIELD_NONCORE_REV2)  },

  };

  #define PCI_ID_TABLE_ENTRY(A) { .descr=A, .n_devs = ARRAY_SIZE(A) }
  static const struct pci_id_table pci_dev_table[] = {

  	PCI_ID_TABLE_ENTRY(pci_dev_descr_i7core_nehalem),
  	PCI_ID_TABLE_ENTRY(pci_dev_descr_lynnfield),
  	PCI_ID_TABLE_ENTRY(pci_dev_descr_i7core_westmere),

  	{0,}			/* 0 terminated list. */

  };

  /*
   *	pci_device_id	table for which devices we are looking for

   */

  static const struct pci_device_id i7core_pci_tbl[] = {

  	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_X58_HUB_MGMT)},

  	{PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_LYNNFIELD_QPI_LINK0)},

  	{0,}			/* 0 terminated list. */
  };

  /****************************************************************************

  			Ancillary status routines

   ****************************************************************************/
  
  	/* MC_CONTROL bits */

  #define CH_ACTIVE(pvt, ch)	((pvt)->info.mc_control & (1 << (8 + ch)))
  #define ECCx8(pvt)		((pvt)->info.mc_control & (1 << 1))

  
  	/* MC_STATUS bits */

  #define ECC_ENABLED(pvt)	((pvt)->info.mc_status & (1 << 4))

  #define CH_DISABLED(pvt, ch)	((pvt)->info.mc_status & (1 << ch))

  
  	/* MC_MAX_DOD read functions */

  static inline int numdimms(u32 dimms)

  {

  	return (dimms & 0x3) + 1;

  }

  static inline int numrank(u32 rank)

  {

  	static const int ranks[] = { 1, 2, 4, -EINVAL };

  	return ranks[rank & 0x3];

  }

  static inline int numbank(u32 bank)

  {

  	static const int banks[] = { 4, 8, 16, -EINVAL };

  	return banks[bank & 0x3];

  }

  static inline int numrow(u32 row)

  {

  	static const int rows[] = {

  		1 << 12, 1 << 13, 1 << 14, 1 << 15,
  		1 << 16, -EINVAL, -EINVAL, -EINVAL,
  	};

  	return rows[row & 0x7];

  }

  static inline int numcol(u32 col)

  {

  	static const int cols[] = {

  		1 << 10, 1 << 11, 1 << 12, -EINVAL,
  	};

  	return cols[col & 0x3];

  }

  static struct i7core_dev *get_i7core_dev(u8 socket)

  {
  	struct i7core_dev *i7core_dev;
  
  	list_for_each_entry(i7core_dev, &i7core_edac_list, list) {
  		if (i7core_dev->socket == socket)
  			return i7core_dev;
  	}
  
  	return NULL;
  }

  static struct i7core_dev *alloc_i7core_dev(u8 socket,
  					   const struct pci_id_table *table)
  {
  	struct i7core_dev *i7core_dev;
  
  	i7core_dev = kzalloc(sizeof(*i7core_dev), GFP_KERNEL);
  	if (!i7core_dev)
  		return NULL;

  	i7core_dev->pdev = kcalloc(table->n_devs, sizeof(*i7core_dev->pdev),

  				   GFP_KERNEL);
  	if (!i7core_dev->pdev) {
  		kfree(i7core_dev);
  		return NULL;
  	}
  
  	i7core_dev->socket = socket;
  	i7core_dev->n_devs = table->n_devs;
  	list_add_tail(&i7core_dev->list, &i7core_edac_list);
  
  	return i7core_dev;
  }

  static void free_i7core_dev(struct i7core_dev *i7core_dev)
  {
  	list_del(&i7core_dev->list);
  	kfree(i7core_dev->pdev);
  	kfree(i7core_dev);
  }

  /****************************************************************************
  			Memory check routines
   ****************************************************************************/

  static int get_dimm_config(struct mem_ctl_info *mci)

  {
  	struct i7core_pvt *pvt = mci->pvt_info;

  	struct pci_dev *pdev;

  	int i, j;

  	enum edac_type mode;

  	enum mem_type mtype;

  	struct dimm_info *dimm;

  	/* Get data from the MC register, function 0 */

  	pdev = pvt->pci_mcr[0];

  	if (!pdev)

  		return -ENODEV;

  	/* Device 3 function 0 reads */

  	pci_read_config_dword(pdev, MC_CONTROL, &pvt->info.mc_control);
  	pci_read_config_dword(pdev, MC_STATUS, &pvt->info.mc_status);
  	pci_read_config_dword(pdev, MC_MAX_DOD, &pvt->info.max_dod);
  	pci_read_config_dword(pdev, MC_CHANNEL_MAPPER, &pvt->info.ch_map);

  	edac_dbg(0, "QPI %d control=0x%08x status=0x%08x dod=0x%08x map=0x%08x
  ",
  		 pvt->i7core_dev->socket, pvt->info.mc_control,
  		 pvt->info.mc_status, pvt->info.max_dod, pvt->info.ch_map);

  	if (ECC_ENABLED(pvt)) {

  		edac_dbg(0, "ECC enabled with x%d SDCC
  ", ECCx8(pvt) ? 8 : 4);

  		if (ECCx8(pvt))
  			mode = EDAC_S8ECD8ED;
  		else
  			mode = EDAC_S4ECD4ED;
  	} else {

  		edac_dbg(0, "ECC disabled
  ");

  		mode = EDAC_NONE;
  	}

  
  	/* FIXME: need to handle the error codes */

  	edac_dbg(0, "DOD Max limits: DIMMS: %d, %d-ranked, %d-banked x%x x 0x%x
  ",
  		 numdimms(pvt->info.max_dod),
  		 numrank(pvt->info.max_dod >> 2),
  		 numbank(pvt->info.max_dod >> 4),
  		 numrow(pvt->info.max_dod >> 6),
  		 numcol(pvt->info.max_dod >> 9));

  	for (i = 0; i < NUM_CHANS; i++) {

  		u32 data, dimm_dod[3], value[8];

  		if (!pvt->pci_ch[i][0])
  			continue;

  		if (!CH_ACTIVE(pvt, i)) {

  			edac_dbg(0, "Channel %i is not active
  ", i);

  			continue;
  		}
  		if (CH_DISABLED(pvt, i)) {

  			edac_dbg(0, "Channel %i is disabled
  ", i);

  			continue;
  		}

  		/* Devices 4-6 function 0 */

  		pci_read_config_dword(pvt->pci_ch[i][0],

  				MC_CHANNEL_DIMM_INIT_PARAMS, &data);

  
  		if (data & THREE_DIMMS_PRESENT)
  			pvt->channel[i].is_3dimms_present = true;
  
  		if (data & SINGLE_QUAD_RANK_PRESENT)
  			pvt->channel[i].is_single_4rank = true;
  
  		if (data & QUAD_RANK_PRESENT)
  			pvt->channel[i].has_4rank = true;

  		if (data & REGISTERED_DIMM)
  			mtype = MEM_RDDR3;

  		else

  			mtype = MEM_DDR3;

  
  		/* Devices 4-6 function 1 */

  		pci_read_config_dword(pvt->pci_ch[i][1],

  				MC_DOD_CH_DIMM0, &dimm_dod[0]);

  		pci_read_config_dword(pvt->pci_ch[i][1],

  				MC_DOD_CH_DIMM1, &dimm_dod[1]);

  		pci_read_config_dword(pvt->pci_ch[i][1],

  				MC_DOD_CH_DIMM2, &dimm_dod[2]);

  		edac_dbg(0, "Ch%d phy rd%d, wr%d (0x%08x): %s%s%s%cDIMMs
  ",
  			 i,
  			 RDLCH(pvt->info.ch_map, i), WRLCH(pvt->info.ch_map, i),
  			 data,
  			 pvt->channel[i].is_3dimms_present ? "3DIMMS " : "",
  			 pvt->channel[i].is_3dimms_present ? "SINGLE_4R " : "",
  			 pvt->channel[i].has_4rank ? "HAS_4R " : "",
  			 (data & REGISTERED_DIMM) ? 'R' : 'U');

  
  		for (j = 0; j < 3; j++) {
  			u32 banks, ranks, rows, cols;

  			u32 size, npages;

  
  			if (!DIMM_PRESENT(dimm_dod[j]))
  				continue;

  			dimm = edac_get_dimm(mci, i, j, 0);

  			banks = numbank(MC_DOD_NUMBANK(dimm_dod[j]));
  			ranks = numrank(MC_DOD_NUMRANK(dimm_dod[j]));
  			rows = numrow(MC_DOD_NUMROW(dimm_dod[j]));
  			cols = numcol(MC_DOD_NUMCOL(dimm_dod[j]));

  			/* DDR3 has 8 I/O banks */
  			size = (rows * cols * banks * ranks) >> (20 - 3);

  			edac_dbg(0, "\tdimm %d %d MiB offset: %x, bank: %d, rank: %d, row: %#x, col: %#x
  ",

  				 j, size,
  				 RANKOFFSET(dimm_dod[j]),
  				 banks, ranks, rows, cols);

  			npages = MiB_TO_PAGES(size);

  			dimm->nr_pages = npages;

  			switch (banks) {
  			case 4:

  				dimm->dtype = DEV_X4;

  				break;
  			case 8:

  				dimm->dtype = DEV_X8;

  				break;
  			case 16:

  				dimm->dtype = DEV_X16;

  				break;
  			default:

  				dimm->dtype = DEV_UNKNOWN;

  			}

  			snprintf(dimm->label, sizeof(dimm->label),
  				 "CPU#%uChannel#%u_DIMM#%u",
  				 pvt->i7core_dev->socket, i, j);
  			dimm->grain = 8;
  			dimm->edac_mode = mode;
  			dimm->mtype = mtype;

  		}

  		pci_read_config_dword(pdev, MC_SAG_CH_0, &value[0]);
  		pci_read_config_dword(pdev, MC_SAG_CH_1, &value[1]);
  		pci_read_config_dword(pdev, MC_SAG_CH_2, &value[2]);
  		pci_read_config_dword(pdev, MC_SAG_CH_3, &value[3]);
  		pci_read_config_dword(pdev, MC_SAG_CH_4, &value[4]);
  		pci_read_config_dword(pdev, MC_SAG_CH_5, &value[5]);
  		pci_read_config_dword(pdev, MC_SAG_CH_6, &value[6]);
  		pci_read_config_dword(pdev, MC_SAG_CH_7, &value[7]);

  		edac_dbg(1, "\t[%i] DIVBY3\tREMOVED\tOFFSET
  ", i);

  		for (j = 0; j < 8; j++)

  			edac_dbg(1, "\t\t%#x\t%#x\t%#x
  ",
  				 (value[j] >> 27) & 0x1,
  				 (value[j] >> 24) & 0x7,
  				 (value[j] & ((1 << 24) - 1)));

  	}

  	return 0;
  }
  
  /****************************************************************************

  			Error insertion routines
   ****************************************************************************/

  #define to_mci(k) container_of(k, struct mem_ctl_info, dev)

  /* The i7core has independent error injection features per channel.
     However, to have a simpler code, we don't allow enabling error injection
     on more than one channel.
     Also, since a change at an inject parameter will be applied only at enable,
     we're disabling error injection on all write calls to the sysfs nodes that
     controls the error code injection.
   */

  static int disable_inject(const struct mem_ctl_info *mci)

  {
  	struct i7core_pvt *pvt = mci->pvt_info;
  
  	pvt->inject.enable = 0;

  	if (!pvt->pci_ch[pvt->inject.channel][0])

  		return -ENODEV;

  	pci_write_config_dword(pvt->pci_ch[pvt->inject.channel][0],

  				MC_CHANNEL_ERROR_INJECT, 0);

  
  	return 0;

  }
  
  /*
   * i7core inject inject.section
   *
   *	accept and store error injection inject.section value
   *	bit 0 - refers to the lower 32-byte half cacheline
   *	bit 1 - refers to the upper 32-byte half cacheline
   */

  static ssize_t i7core_inject_section_store(struct device *dev,
  					   struct device_attribute *mattr,

  					   const char *data, size_t count)
  {

  	struct mem_ctl_info *mci = to_mci(dev);

  	struct i7core_pvt *pvt = mci->pvt_info;
  	unsigned long value;
  	int rc;
  
  	if (pvt->inject.enable)

  		disable_inject(mci);

  	rc = kstrtoul(data, 10, &value);

  	if ((rc < 0) || (value > 3))

  		return -EIO;

  
  	pvt->inject.section = (u32) value;
  	return count;
  }

  static ssize_t i7core_inject_section_show(struct device *dev,
  					  struct device_attribute *mattr,
  					  char *data)

  {

  	struct mem_ctl_info *mci = to_mci(dev);

  	struct i7core_pvt *pvt = mci->pvt_info;
  	return sprintf(data, "0x%08x
  ", pvt->inject.section);
  }
  
  /*
   * i7core inject.type
   *
   *	accept and store error injection inject.section value
   *	bit 0 - repeat enable - Enable error repetition
   *	bit 1 - inject ECC error
   *	bit 2 - inject parity error
   */

  static ssize_t i7core_inject_type_store(struct device *dev,
  					struct device_attribute *mattr,

  					const char *data, size_t count)
  {

  	struct mem_ctl_info *mci = to_mci(dev);

  	struct i7core_pvt *pvt = mci->pvt_info;

  	unsigned long value;
  	int rc;
  
  	if (pvt->inject.enable)

  		disable_inject(mci);

  	rc = kstrtoul(data, 10, &value);

  	if ((rc < 0) || (value > 7))

  		return -EIO;

  
  	pvt->inject.type = (u32) value;
  	return count;
  }

  static ssize_t i7core_inject_type_show(struct device *dev,
  				       struct device_attribute *mattr,
  				       char *data)

  {

  	struct mem_ctl_info *mci = to_mci(dev);

  	struct i7core_pvt *pvt = mci->pvt_info;

  	return sprintf(data, "0x%08x
  ", pvt->inject.type);
  }
  
  /*
   * i7core_inject_inject.eccmask_store
   *
   * The type of error (UE/CE) will depend on the inject.eccmask value:
   *   Any bits set to a 1 will flip the corresponding ECC bit
   *   Correctable errors can be injected by flipping 1 bit or the bits within
   *   a symbol pair (2 consecutive aligned 8-bit pairs - i.e. 7:0 and 15:8 or
   *   23:16 and 31:24). Flipping bits in two symbol pairs will cause an
   *   uncorrectable error to be injected.
   */

  static ssize_t i7core_inject_eccmask_store(struct device *dev,
  					   struct device_attribute *mattr,
  					   const char *data, size_t count)

  {

  	struct mem_ctl_info *mci = to_mci(dev);

  	struct i7core_pvt *pvt = mci->pvt_info;
  	unsigned long value;
  	int rc;
  
  	if (pvt->inject.enable)

  		disable_inject(mci);

  	rc = kstrtoul(data, 10, &value);

  	if (rc < 0)

  		return -EIO;

  
  	pvt->inject.eccmask = (u32) value;
  	return count;
  }

  static ssize_t i7core_inject_eccmask_show(struct device *dev,
  					  struct device_attribute *mattr,
  					  char *data)

  {

  	struct mem_ctl_info *mci = to_mci(dev);

  	struct i7core_pvt *pvt = mci->pvt_info;

  	return sprintf(data, "0x%08x
  ", pvt->inject.eccmask);
  }
  
  /*
   * i7core_addrmatch
   *
   * The type of error (UE/CE) will depend on the inject.eccmask value:
   *   Any bits set to a 1 will flip the corresponding ECC bit
   *   Correctable errors can be injected by flipping 1 bit or the bits within
   *   a symbol pair (2 consecutive aligned 8-bit pairs - i.e. 7:0 and 15:8 or
   *   23:16 and 31:24). Flipping bits in two symbol pairs will cause an
   *   uncorrectable error to be injected.
   */

  #define DECLARE_ADDR_MATCH(param, limit)			\
  static ssize_t i7core_inject_store_##param(			\

  	struct device *dev,					\
  	struct device_attribute *mattr,				\
  	const char *data, size_t count)				\

  {								\

  	struct mem_ctl_info *mci = dev_get_drvdata(dev);	\

  	struct i7core_pvt *pvt;					\

  	long value;						\
  	int rc;							\
  								\

  	edac_dbg(1, "
  ");					\

  	pvt = mci->pvt_info;					\
  								\

  	if (pvt->inject.enable)					\
  		disable_inject(mci);				\
  								\

  	if (!strcasecmp(data, "any") || !strcasecmp(data, "any
  "))\

  		value = -1;					\
  	else {							\

  		rc = kstrtoul(data, 10, &value);		\

  		if ((rc < 0) || (value >= limit))		\
  			return -EIO;				\
  	}							\
  								\
  	pvt->inject.param = value;				\
  								\
  	return count;						\
  }								\
  								\
  static ssize_t i7core_inject_show_##param(			\

  	struct device *dev,					\
  	struct device_attribute *mattr,				\
  	char *data)						\

  {								\

  	struct mem_ctl_info *mci = dev_get_drvdata(dev);	\

  	struct i7core_pvt *pvt;					\
  								\
  	pvt = mci->pvt_info;					\

  	edac_dbg(1, "pvt=%p
  ", pvt);				\

  	if (pvt->inject.param < 0)				\
  		return sprintf(data, "any
  ");			\
  	else							\
  		return sprintf(data, "%d
  ", pvt->inject.param);\

  }

  #define ATTR_ADDR_MATCH(param)					\

  	static DEVICE_ATTR(param, S_IRUGO | S_IWUSR,		\
  		    i7core_inject_show_##param,			\
  		    i7core_inject_store_##param)

  DECLARE_ADDR_MATCH(channel, 3);
  DECLARE_ADDR_MATCH(dimm, 3);
  DECLARE_ADDR_MATCH(rank, 4);
  DECLARE_ADDR_MATCH(bank, 32);
  DECLARE_ADDR_MATCH(page, 0x10000);
  DECLARE_ADDR_MATCH(col, 0x4000);

  ATTR_ADDR_MATCH(channel);
  ATTR_ADDR_MATCH(dimm);
  ATTR_ADDR_MATCH(rank);
  ATTR_ADDR_MATCH(bank);
  ATTR_ADDR_MATCH(page);
  ATTR_ADDR_MATCH(col);

  static int write_and_test(struct pci_dev *dev, const int where, const u32 val)

  {
  	u32 read;
  	int count;

  	edac_dbg(0, "setting pci %02x:%02x.%x reg=%02x value=%08x
  ",
  		 dev->bus->number, PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn),
  		 where, val);

  	for (count = 0; count < 10; count++) {
  		if (count)

  			msleep(100);

  		pci_write_config_dword(dev, where, val);
  		pci_read_config_dword(dev, where, &read);
  
  		if (read == val)
  			return 0;
  	}

  	i7core_printk(KERN_ERR, "Error during set pci %02x:%02x.%x reg=%02x "
  		"write=%08x. Read=%08x
  ",
  		dev->bus->number, PCI_SLOT(dev->devfn), PCI_FUNC(dev->devfn),
  		where, val, read);

  
  	return -EINVAL;
  }

  /*
   * This routine prepares the Memory Controller for error injection.
   * The error will be injected when some process tries to write to the
   * memory that matches the given criteria.
   * The criteria can be set in terms of a mask where dimm, rank, bank, page
   * and col can be specified.
   * A -1 value for any of the mask items will make the MCU to ignore
   * that matching criteria for error injection.
   *
   * It should be noticed that the error will only happen after a write operation
   * on a memory that matches the condition. if REPEAT_EN is not enabled at
   * inject mask, then it will produce just one error. Otherwise, it will repeat
   * until the injectmask would be cleaned.
   *
   * FIXME: This routine assumes that MAXNUMDIMMS value of MC_MAX_DOD
   *    is reliable enough to check if the MC is using the
   *    three channels. However, this is not clear at the datasheet.
   */

  static ssize_t i7core_inject_enable_store(struct device *dev,
  					  struct device_attribute *mattr,
  					  const char *data, size_t count)

  {

  	struct mem_ctl_info *mci = to_mci(dev);

  	struct i7core_pvt *pvt = mci->pvt_info;
  	u32 injectmask;
  	u64 mask = 0;
  	int  rc;
  	long enable;

  	if (!pvt->pci_ch[pvt->inject.channel][0])

  		return 0;

  	rc = kstrtoul(data, 10, &enable);

  	if ((rc < 0))
  		return 0;
  
  	if (enable) {
  		pvt->inject.enable = 1;
  	} else {
  		disable_inject(mci);
  		return count;
  	}
  
  	/* Sets pvt->inject.dimm mask */
  	if (pvt->inject.dimm < 0)

  		mask |= 1LL << 41;

  	else {

  		if (pvt->channel[pvt->inject.channel].dimms > 2)

  			mask |= (pvt->inject.dimm & 0x3LL) << 35;

  		else

  			mask |= (pvt->inject.dimm & 0x1LL) << 36;

  	}
  
  	/* Sets pvt->inject.rank mask */
  	if (pvt->inject.rank < 0)

  		mask |= 1LL << 40;

  	else {

  		if (pvt->channel[pvt->inject.channel].dimms > 2)

  			mask |= (pvt->inject.rank & 0x1LL) << 34;

  		else

  			mask |= (pvt->inject.rank & 0x3LL) << 34;

  	}
  
  	/* Sets pvt->inject.bank mask */
  	if (pvt->inject.bank < 0)

  		mask |= 1LL << 39;

  	else

  		mask |= (pvt->inject.bank & 0x15LL) << 30;

  
  	/* Sets pvt->inject.page mask */
  	if (pvt->inject.page < 0)

  		mask |= 1LL << 38;

  	else

  		mask |= (pvt->inject.page & 0xffff) << 14;

  
  	/* Sets pvt->inject.column mask */
  	if (pvt->inject.col < 0)

  		mask |= 1LL << 37;

  	else

  		mask |= (pvt->inject.col & 0x3fff);

  	/*
  	 * bit    0: REPEAT_EN
  	 * bits 1-2: MASK_HALF_CACHELINE
  	 * bit    3: INJECT_ECC
  	 * bit    4: INJECT_ADDR_PARITY
  	 */
  
  	injectmask = (pvt->inject.type & 1) |
  		     (pvt->inject.section & 0x3) << 1 |
  		     (pvt->inject.type & 0x6) << (3 - 1);
  
  	/* Unlock writes to registers - this register is write only */

  	pci_write_config_dword(pvt->pci_noncore,

  			       MC_CFG_CONTROL, 0x2);

  	write_and_test(pvt->pci_ch[pvt->inject.channel][0],

  			       MC_CHANNEL_ADDR_MATCH, mask);

  	write_and_test(pvt->pci_ch[pvt->inject.channel][0],

  			       MC_CHANNEL_ADDR_MATCH + 4, mask >> 32L);

  	write_and_test(pvt->pci_ch[pvt->inject.channel][0],

  			       MC_CHANNEL_ERROR_MASK, pvt->inject.eccmask);

  	write_and_test(pvt->pci_ch[pvt->inject.channel][0],

  			       MC_CHANNEL_ERROR_INJECT, injectmask);

  	/*

  	 * This is something undocumented, based on my tests
  	 * Without writing 8 to this register, errors aren't injected. Not sure
  	 * why.

  	 */

  	pci_write_config_dword(pvt->pci_noncore,

  			       MC_CFG_CONTROL, 8);

  	edac_dbg(0, "Error inject addr match 0x%016llx, ecc 0x%08x, inject 0x%08x
  ",
  		 mask, pvt->inject.eccmask, injectmask);

  	return count;
  }

  static ssize_t i7core_inject_enable_show(struct device *dev,
  					 struct device_attribute *mattr,
  					 char *data)

  {

  	struct mem_ctl_info *mci = to_mci(dev);

  	struct i7core_pvt *pvt = mci->pvt_info;

  	u32 injectmask;

  	if (!pvt->pci_ch[pvt->inject.channel][0])
  		return 0;

  	pci_read_config_dword(pvt->pci_ch[pvt->inject.channel][0],

  			       MC_CHANNEL_ERROR_INJECT, &injectmask);

  	edac_dbg(0, "Inject error read: 0x%018x
  ", injectmask);

  
  	if (injectmask & 0x0c)
  		pvt->inject.enable = 1;

  	return sprintf(data, "%d
  ", pvt->inject.enable);
  }

  #define DECLARE_COUNTER(param)					\
  static ssize_t i7core_show_counter_##param(			\

  	struct device *dev,					\
  	struct device_attribute *mattr,				\
  	char *data)						\

  {								\

  	struct mem_ctl_info *mci = dev_get_drvdata(dev);	\

  	struct i7core_pvt *pvt = mci->pvt_info;			\
  								\

  	edac_dbg(1, "
  ");					\

  	if (!pvt->ce_count_available || (pvt->is_registered))	\
  		return sprintf(data, "data unavailable
  ");	\
  	return sprintf(data, "%lu
  ",				\
  			pvt->udimm_ce_count[param]);		\
  }

  #define ATTR_COUNTER(param)					\

  	static DEVICE_ATTR(udimm##param, S_IRUGO | S_IWUSR,	\
  		    i7core_show_counter_##param,		\
  		    NULL)

  DECLARE_COUNTER(0);
  DECLARE_COUNTER(1);
  DECLARE_COUNTER(2);

  ATTR_COUNTER(0);
  ATTR_COUNTER(1);
  ATTR_COUNTER(2);

  /*

   * inject_addrmatch device sysfs struct

   */

  static struct attribute *i7core_addrmatch_attrs[] = {
  	&dev_attr_channel.attr,
  	&dev_attr_dimm.attr,
  	&dev_attr_rank.attr,
  	&dev_attr_bank.attr,
  	&dev_attr_page.attr,
  	&dev_attr_col.attr,
  	NULL

  };

  static const struct attribute_group addrmatch_grp = {

  	.attrs	= i7core_addrmatch_attrs,

  };

  static const struct attribute_group *addrmatch_groups[] = {
  	&addrmatch_grp,
  	NULL

  };

  static void addrmatch_release(struct device *device)
  {

  	edac_dbg(1, "Releasing device %s
  ", dev_name(device));

  	kfree(device);

  }

  static const struct device_type addrmatch_type = {

  	.groups		= addrmatch_groups,
  	.release	= addrmatch_release,

  };

  /*
   * all_channel_counts sysfs struct
   */
  
  static struct attribute *i7core_udimm_counters_attrs[] = {
  	&dev_attr_udimm0.attr,
  	&dev_attr_udimm1.attr,
  	&dev_attr_udimm2.attr,
  	NULL

  };

  static const struct attribute_group all_channel_counts_grp = {

  	.attrs	= i7core_udimm_counters_attrs,

  };

  static const struct attribute_group *all_channel_counts_groups[] = {
  	&all_channel_counts_grp,
  	NULL

  };

  static void all_channel_counts_release(struct device *device)
  {

  	edac_dbg(1, "Releasing device %s
  ", dev_name(device));

  	kfree(device);

  }

  static const struct device_type all_channel_counts_type = {

  	.groups		= all_channel_counts_groups,
  	.release	= all_channel_counts_release,
  };
  
  /*
   * inject sysfs attributes
   */
  
  static DEVICE_ATTR(inject_section, S_IRUGO | S_IWUSR,
  		   i7core_inject_section_show, i7core_inject_section_store);
  
  static DEVICE_ATTR(inject_type, S_IRUGO | S_IWUSR,
  		   i7core_inject_type_show, i7core_inject_type_store);
  
  
  static DEVICE_ATTR(inject_eccmask, S_IRUGO | S_IWUSR,
  		   i7core_inject_eccmask_show, i7core_inject_eccmask_store);
  
  static DEVICE_ATTR(inject_enable, S_IRUGO | S_IWUSR,
  		   i7core_inject_enable_show, i7core_inject_enable_store);

  static struct attribute *i7core_dev_attrs[] = {
  	&dev_attr_inject_section.attr,
  	&dev_attr_inject_type.attr,
  	&dev_attr_inject_eccmask.attr,
  	&dev_attr_inject_enable.attr,
  	NULL
  };
  
  ATTRIBUTE_GROUPS(i7core_dev);

  static int i7core_create_sysfs_devices(struct mem_ctl_info *mci)
  {
  	struct i7core_pvt *pvt = mci->pvt_info;
  	int rc;

  	pvt->addrmatch_dev = kzalloc(sizeof(*pvt->addrmatch_dev), GFP_KERNEL);
  	if (!pvt->addrmatch_dev)

  		return -ENOMEM;

  
  	pvt->addrmatch_dev->type = &addrmatch_type;
  	pvt->addrmatch_dev->bus = mci->dev.bus;
  	device_initialize(pvt->addrmatch_dev);
  	pvt->addrmatch_dev->parent = &mci->dev;
  	dev_set_name(pvt->addrmatch_dev, "inject_addrmatch");
  	dev_set_drvdata(pvt->addrmatch_dev, mci);

  	edac_dbg(1, "creating %s
  ", dev_name(pvt->addrmatch_dev));

  	rc = device_add(pvt->addrmatch_dev);

  	if (rc < 0)

  		goto err_put_addrmatch;

  
  	if (!pvt->is_registered) {

  		pvt->chancounts_dev = kzalloc(sizeof(*pvt->chancounts_dev),
  					      GFP_KERNEL);
  		if (!pvt->chancounts_dev) {

  			rc = -ENOMEM;
  			goto err_del_addrmatch;

  		}
  
  		pvt->chancounts_dev->type = &all_channel_counts_type;
  		pvt->chancounts_dev->bus = mci->dev.bus;
  		device_initialize(pvt->chancounts_dev);
  		pvt->chancounts_dev->parent = &mci->dev;
  		dev_set_name(pvt->chancounts_dev, "all_channel_counts");
  		dev_set_drvdata(pvt->chancounts_dev, mci);

  		edac_dbg(1, "creating %s
  ", dev_name(pvt->chancounts_dev));

  		rc = device_add(pvt->chancounts_dev);

  		if (rc < 0)

  			goto err_put_chancounts;

  	}
  	return 0;

  
  err_put_chancounts:
  	put_device(pvt->chancounts_dev);
  err_del_addrmatch:
  	device_del(pvt->addrmatch_dev);
  err_put_addrmatch:
  	put_device(pvt->addrmatch_dev);
  
  	return rc;

  }
  
  static void i7core_delete_sysfs_devices(struct mem_ctl_info *mci)
  {
  	struct i7core_pvt *pvt = mci->pvt_info;

  	edac_dbg(1, "
  ");

  	if (!pvt->is_registered) {

  		device_del(pvt->chancounts_dev);

  		put_device(pvt->chancounts_dev);

  	}

  	device_del(pvt->addrmatch_dev);

  	put_device(pvt->addrmatch_dev);

  }

  /****************************************************************************

  	Device initialization routines: put/get, init/exit
   ****************************************************************************/
  
  /*

   *	i7core_put_all_devices	'put' all the devices that we have

   *				reserved via 'get'
   */

  static void i7core_put_devices(struct i7core_dev *i7core_dev)

  {

  	int i;

  	edac_dbg(0, "
  ");

  	for (i = 0; i < i7core_dev->n_devs; i++) {

  		struct pci_dev *pdev = i7core_dev->pdev[i];
  		if (!pdev)
  			continue;

  		edac_dbg(0, "Removing dev %02x:%02x.%d
  ",
  			 pdev->bus->number,
  			 PCI_SLOT(pdev->devfn), PCI_FUNC(pdev->devfn));

  		pci_dev_put(pdev);
  	}

  }

  static void i7core_put_all_devices(void)
  {

  	struct i7core_dev *i7core_dev, *tmp;

  	list_for_each_entry_safe(i7core_dev, tmp, &i7core_edac_list, list) {

  		i7core_put_devices(i7core_dev);

  		free_i7core_dev(i7core_dev);

  	}

  }

  static void __init i7core_xeon_pci_fixup(const struct pci_id_table *table)

  {
  	struct pci_dev *pdev = NULL;
  	int i;

  	/*

  	 * On Xeon 55xx, the Intel Quick Path Arch Generic Non-core pci buses

  	 * aren't announced by acpi. So, we need to use a legacy scan probing
  	 * to detect them
  	 */

  	while (table && table->descr) {
  		pdev = pci_get_device(PCI_VENDOR_ID_INTEL, table->descr[0].dev_id, NULL);
  		if (unlikely(!pdev)) {
  			for (i = 0; i < MAX_SOCKET_BUSES; i++)
  				pcibios_scan_specific_bus(255-i);
  		}

  		pci_dev_put(pdev);

  		table++;

  	}
  }

  static unsigned i7core_pci_lastbus(void)
  {
  	int last_bus = 0, bus;
  	struct pci_bus *b = NULL;
  
  	while ((b = pci_find_next_bus(b)) != NULL) {
  		bus = b->number;

  		edac_dbg(0, "Found bus %d
  ", bus);

  		if (bus > last_bus)
  			last_bus = bus;
  	}

  	edac_dbg(0, "Last bus %d
  ", last_bus);

  
  	return last_bus;
  }

  /*

   *	i7core_get_all_devices	Find and perform 'get' operation on the MCH's

   *			device/functions we want to reference for this driver
   *
   *			Need to 'get' device 16 func 1 and func 2
   */

  static int i7core_get_onedevice(struct pci_dev **prev,
  				const struct pci_id_table *table,
  				const unsigned devno,
  				const unsigned last_bus)

  {

  	struct i7core_dev *i7core_dev;

  	const struct pci_id_descr *dev_descr = &table->descr[devno];

  	struct pci_dev *pdev = NULL;

  	u8 bus = 0;
  	u8 socket = 0;

  	pdev = pci_get_device(PCI_VENDOR_ID_INTEL,

  			      dev_descr->dev_id, *prev);

  	/*

  	 * On Xeon 55xx, the Intel QuickPath Arch Generic Non-core regs

  	 * is at addr 8086:2c40, instead of 8086:2c41. So, we need
  	 * to probe for the alternate address in case of failure
  	 */

  	if (dev_descr->dev_id == PCI_DEVICE_ID_INTEL_I7_NONCORE && !pdev) {
  		pci_dev_get(*prev);	/* pci_get_device will put it */

  		pdev = pci_get_device(PCI_VENDOR_ID_INTEL,
  				      PCI_DEVICE_ID_INTEL_I7_NONCORE_ALT, *prev);

  	}

  	if (dev_descr->dev_id == PCI_DEVICE_ID_INTEL_LYNNFIELD_NONCORE &&
  	    !pdev) {
  		pci_dev_get(*prev);	/* pci_get_device will put it */

  		pdev = pci_get_device(PCI_VENDOR_ID_INTEL,
  				      PCI_DEVICE_ID_INTEL_LYNNFIELD_NONCORE_ALT,
  				      *prev);

  	}

  	if (!pdev) {
  		if (*prev) {
  			*prev = pdev;
  			return 0;

  		}

  		if (dev_descr->optional)

  			return 0;

  		if (devno == 0)
  			return -ENODEV;

  		i7core_printk(KERN_INFO,

  			"Device not found: dev %02x.%d PCI ID %04x:%04x
  ",

  			dev_descr->dev, dev_descr->func,
  			PCI_VENDOR_ID_INTEL, dev_descr->dev_id);

  		/* End of list, leave */
  		return -ENODEV;
  	}
  	bus = pdev->bus->number;

  	socket = last_bus - bus;

  	i7core_dev = get_i7core_dev(socket);
  	if (!i7core_dev) {

  		i7core_dev = alloc_i7core_dev(socket, table);

  		if (!i7core_dev) {
  			pci_dev_put(pdev);

  			return -ENOMEM;

  		}

  	}

  	if (i7core_dev->pdev[devno]) {

  		i7core_printk(KERN_ERR,
  			"Duplicated device for "
  			"dev %02x:%02x.%d PCI ID %04x:%04x
  ",

  			bus, dev_descr->dev, dev_descr->func,
  			PCI_VENDOR_ID_INTEL, dev_descr->dev_id);

  		pci_dev_put(pdev);
  		return -ENODEV;
  	}

  	i7core_dev->pdev[devno] = pdev;

  
  	/* Sanity check */

  	if (unlikely(PCI_SLOT(pdev->devfn) != dev_descr->dev ||
  			PCI_FUNC(pdev->devfn) != dev_descr->func)) {

  		i7core_printk(KERN_ERR,
  			"Device PCI ID %04x:%04x "
  			"has dev %02x:%02x.%d instead of dev %02x:%02x.%d
  ",

  			PCI_VENDOR_ID_INTEL, dev_descr->dev_id,

  			bus, PCI_SLOT(pdev->devfn), PCI_FUNC(pdev->devfn),

  			bus, dev_descr->dev, dev_descr->func);

  		return -ENODEV;
  	}

  	/* Be sure that the device is enabled */
  	if (unlikely(pci_enable_device(pdev) < 0)) {
  		i7core_printk(KERN_ERR,
  			"Couldn't enable "
  			"dev %02x:%02x.%d PCI ID %04x:%04x
  ",

  			bus, dev_descr->dev, dev_descr->func,
  			PCI_VENDOR_ID_INTEL, dev_descr->dev_id);

  		return -ENODEV;
  	}

  	edac_dbg(0, "Detected socket %d dev %02x:%02x.%d PCI ID %04x:%04x
  ",
  		 socket, bus, dev_descr->dev,
  		 dev_descr->func,
  		 PCI_VENDOR_ID_INTEL, dev_descr->dev_id);

  	/*
  	 * As stated on drivers/pci/search.c, the reference count for
  	 * @from is always decremented if it is not %NULL. So, as we need
  	 * to get all devices up to null, we need to do a get for the device
  	 */
  	pci_dev_get(pdev);

  	*prev = pdev;

  	return 0;
  }

  static int i7core_get_all_devices(void)

  {

  	int i, rc, last_bus;

  	struct pci_dev *pdev = NULL;

  	const struct pci_id_table *table = pci_dev_table;

  	last_bus = i7core_pci_lastbus();

  	while (table && table->descr) {

  		for (i = 0; i < table->n_devs; i++) {
  			pdev = NULL;
  			do {

  				rc = i7core_get_onedevice(&pdev, table, i,

  							  last_bus);

  				if (rc < 0) {
  					if (i == 0) {
  						i = table->n_devs;
  						break;
  					}
  					i7core_put_all_devices();
  					return -ENODEV;
  				}
  			} while (pdev);
  		}

  		table++;

  	}

  	return 0;

  }

  static int mci_bind_devs(struct mem_ctl_info *mci,
  			 struct i7core_dev *i7core_dev)

  {
  	struct i7core_pvt *pvt = mci->pvt_info;
  	struct pci_dev *pdev;

  	int i, func, slot;

  	char *family;

  	pvt->is_registered = false;
  	pvt->enable_scrub  = false;

  	for (i = 0; i < i7core_dev->n_devs; i++) {

  		pdev = i7core_dev->pdev[i];
  		if (!pdev)

  			continue;

  		func = PCI_FUNC(pdev->devfn);
  		slot = PCI_SLOT(pdev->devfn);
  		if (slot == 3) {
  			if (unlikely(func > MAX_MCR_FUNC))
  				goto error;
  			pvt->pci_mcr[func] = pdev;
  		} else if (likely(slot >= 4 && slot < 4 + NUM_CHANS)) {
  			if (unlikely(func > MAX_CHAN_FUNC))

  				goto error;

  			pvt->pci_ch[slot - 4][func] = pdev;

  		} else if (!slot && !func) {

  			pvt->pci_noncore = pdev;

  
  			/* Detect the processor family */
  			switch (pdev->device) {
  			case PCI_DEVICE_ID_INTEL_I7_NONCORE:
  				family = "Xeon 35xx/ i7core";
  				pvt->enable_scrub = false;
  				break;
  			case PCI_DEVICE_ID_INTEL_LYNNFIELD_NONCORE_ALT:
  				family = "i7-800/i5-700";
  				pvt->enable_scrub = false;
  				break;
  			case PCI_DEVICE_ID_INTEL_LYNNFIELD_NONCORE:
  				family = "Xeon 34xx";
  				pvt->enable_scrub = false;
  				break;
  			case PCI_DEVICE_ID_INTEL_I7_NONCORE_ALT:
  				family = "Xeon 55xx";
  				pvt->enable_scrub = true;
  				break;
  			case PCI_DEVICE_ID_INTEL_LYNNFIELD_NONCORE_REV2:
  				family = "Xeon 56xx / i7-900";
  				pvt->enable_scrub = true;
  				break;
  			default:
  				family = "unknown";
  				pvt->enable_scrub = false;
  			}

  			edac_dbg(0, "Detected a processor type %s
  ", family);

  		} else

  			goto error;

  		edac_dbg(0, "Associated fn %d.%d, dev = %p, socket %d
  ",
  			 PCI_SLOT(pdev->devfn), PCI_FUNC(pdev->devfn),
  			 pdev, i7core_dev->socket);

  		if (PCI_SLOT(pdev->devfn) == 3 &&
  			PCI_FUNC(pdev->devfn) == 2)

  			pvt->is_registered = true;

  	}

  	return 0;

  
  error:
  	i7core_printk(KERN_ERR, "Device %d, function %d "
  		      "is out of the expected range
  ",
  		      slot, func);
  	return -EINVAL;

  }

  /****************************************************************************
  			Error check routines
   ****************************************************************************/

  
  static void i7core_rdimm_update_ce_count(struct mem_ctl_info *mci,

  					 const int chan,
  					 const int new0,
  					 const int new1,
  					 const int new2)

  {
  	struct i7core_pvt *pvt = mci->pvt_info;
  	int add0 = 0, add1 = 0, add2 = 0;
  	/* Updates CE counters if it is not the first time here */

  	if (pvt->ce_count_available) {

  		/* Updates CE counters */

  		add2 = new2 - pvt->rdimm_last_ce_count[chan][2];
  		add1 = new1 - pvt->rdimm_last_ce_count[chan][1];
  		add0 = new0 - pvt->rdimm_last_ce_count[chan][0];

  
  		if (add2 < 0)
  			add2 += 0x7fff;

  		pvt->rdimm_ce_count[chan][2] += add2;

  
  		if (add1 < 0)
  			add1 += 0x7fff;

  		pvt->rdimm_ce_count[chan][1] += add1;

  
  		if (add0 < 0)
  			add0 += 0x7fff;

  		pvt->rdimm_ce_count[chan][0] += add0;

  	} else