[mirror_ubuntu-jammy-kernel.git] / drivers / edac / ie31200_edac.c

/*
 * Intel E3-1200
 * Copyright (C) 2014 Jason Baron <jbaron@akamai.com>
 *
 * Support for the E3-1200 processor family. Heavily based on previous
 * Intel EDAC drivers.
 *
 * Since the DRAM controller is on the cpu chip, we can use its PCI device
 * id to identify these processors.
 *
 * PCI DRAM controller device ids (Taken from The PCI ID Repository - http://pci-ids.ucw.cz/)
 *
 * 0108: Xeon E3-1200 Processor Family DRAM Controller
 * 010c: Xeon E3-1200/2nd Generation Core Processor Family DRAM Controller
 * 0150: Xeon E3-1200 v2/3rd Gen Core processor DRAM Controller
 * 0158: Xeon E3-1200 v2/Ivy Bridge DRAM Controller
 * 015c: Xeon E3-1200 v2/3rd Gen Core processor DRAM Controller
 * 0c04: Xeon E3-1200 v3/4th Gen Core Processor DRAM Controller
 * 0c08: Xeon E3-1200 v3 Processor DRAM Controller
 *
 * Based on Intel specification:
 * http://www.intel.com/content/dam/www/public/us/en/documents/datasheets/xeon-e3-1200v3-vol-2-datasheet.pdf
 * http://www.intel.com/content/www/us/en/processors/xeon/xeon-e3-1200-family-vol-2-datasheet.html
 *
 * According to the above datasheet (p.16):
 * "
 * 6. Software must not access B0/D0/F0 32-bit memory-mapped registers with
 * requests that cross a DW boundary.
 * "
 *
 * Thus, we make use of the explicit: lo_hi_readq(), which breaks the readq into
 * 2 readl() calls. This restriction may be lifted in subsequent chip releases,
 * but lo_hi_readq() ensures that we are safe across all e3-1200 processors.
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/pci_ids.h>
#include <linux/edac.h>

#include <linux/io-64-nonatomic-lo-hi.h>
#include "edac_core.h"

#define IE31200_REVISION "1.0"
#define EDAC_MOD_STR "ie31200_edac"

#define ie31200_printk(level, fmt, arg...) \
	edac_printk(level, "ie31200", fmt, ##arg)

#define PCI_DEVICE_ID_INTEL_IE31200_HB_1 0x0108
#define PCI_DEVICE_ID_INTEL_IE31200_HB_2 0x010c
#define PCI_DEVICE_ID_INTEL_IE31200_HB_3 0x0150
#define PCI_DEVICE_ID_INTEL_IE31200_HB_4 0x0158
#define PCI_DEVICE_ID_INTEL_IE31200_HB_5 0x015c
#define PCI_DEVICE_ID_INTEL_IE31200_HB_6 0x0c04
#define PCI_DEVICE_ID_INTEL_IE31200_HB_7 0x0c08

#define IE31200_DIMMS			4
#define IE31200_RANKS			8
#define IE31200_RANKS_PER_CHANNEL	4
#define IE31200_DIMMS_PER_CHANNEL	2
#define IE31200_CHANNELS		2

/* Intel IE31200 register addresses - device 0 function 0 - DRAM Controller */
#define IE31200_MCHBAR_LOW		0x48
#define IE31200_MCHBAR_HIGH		0x4c
#define IE31200_MCHBAR_MASK		GENMASK_ULL(38, 15)
#define IE31200_MMR_WINDOW_SIZE		BIT(15)

/*
 * Error Status Register (16b)
 *
 * 15    reserved
 * 14    Isochronous TBWRR Run Behind FIFO Full
 *       (ITCV)
 * 13    Isochronous TBWRR Run Behind FIFO Put
 *       (ITSTV)
 * 12    reserved
 * 11    MCH Thermal Sensor Event
 *       for SMI/SCI/SERR (GTSE)
 * 10    reserved
 *  9    LOCK to non-DRAM Memory Flag (LCKF)
 *  8    reserved
 *  7    DRAM Throttle Flag (DTF)
 *  6:2  reserved
 *  1    Multi-bit DRAM ECC Error Flag (DMERR)
 *  0    Single-bit DRAM ECC Error Flag (DSERR)
 */
#define IE31200_ERRSTS			0xc8
#define IE31200_ERRSTS_UE		BIT(1)
#define IE31200_ERRSTS_CE		BIT(0)
#define IE31200_ERRSTS_BITS		(IE31200_ERRSTS_UE | IE31200_ERRSTS_CE)

/*
 * Channel 0 ECC Error Log (64b)
 *
 * 63:48 Error Column Address (ERRCOL)
 * 47:32 Error Row Address (ERRROW)
 * 31:29 Error Bank Address (ERRBANK)
 * 28:27 Error Rank Address (ERRRANK)
 * 26:24 reserved
 * 23:16 Error Syndrome (ERRSYND)
 * 15: 2 reserved
 *    1  Multiple Bit Error Status (MERRSTS)
 *    0  Correctable Error Status (CERRSTS)
 */
#define IE31200_C0ECCERRLOG			0x40c8
#define IE31200_C1ECCERRLOG			0x44c8
#define IE31200_ECCERRLOG_CE			BIT(0)
#define IE31200_ECCERRLOG_UE			BIT(1)
#define IE31200_ECCERRLOG_RANK_BITS		GENMASK_ULL(28, 27)
#define IE31200_ECCERRLOG_RANK_SHIFT		27
#define IE31200_ECCERRLOG_SYNDROME_BITS		GENMASK_ULL(23, 16)
#define IE31200_ECCERRLOG_SYNDROME_SHIFT	16

#define IE31200_ECCERRLOG_SYNDROME(log)		   \
	((log & IE31200_ECCERRLOG_SYNDROME_BITS) >> \
	 IE31200_ECCERRLOG_SYNDROME_SHIFT)

#define IE31200_CAPID0			0xe4
#define IE31200_CAPID0_PDCD		BIT(4)
#define IE31200_CAPID0_DDPCD		BIT(6)
#define IE31200_CAPID0_ECC		BIT(1)

#define IE31200_MAD_DIMM_0_OFFSET	0x5004
#define IE31200_MAD_DIMM_SIZE		GENMASK_ULL(7, 0)
#define IE31200_MAD_DIMM_A_RANK		BIT(17)
#define IE31200_MAD_DIMM_A_WIDTH	BIT(19)

#define IE31200_PAGES(n)		(n << (28 - PAGE_SHIFT))

static int nr_channels;

struct ie31200_priv {
	void __iomem *window;
};

enum ie31200_chips {
	IE31200 = 0,
};

struct ie31200_dev_info {
	const char *ctl_name;
};

struct ie31200_error_info {
	u16 errsts;
	u16 errsts2;
	u64 eccerrlog[IE31200_CHANNELS];
};

static const struct ie31200_dev_info ie31200_devs[] = {
	[IE31200] = {
		.ctl_name = "IE31200"
	},
};

struct dimm_data {
	u8 size; /* in 256MB multiples */
	u8 dual_rank : 1,
	   x16_width : 1; /* 0 means x8 width */
};

static int how_many_channels(struct pci_dev *pdev)
{
	int n_channels;
	unsigned char capid0_2b; /* 2nd byte of CAPID0 */

	pci_read_config_byte(pdev, IE31200_CAPID0 + 1, &capid0_2b);

	/* check PDCD: Dual Channel Disable */
	if (capid0_2b & IE31200_CAPID0_PDCD) {
		edac_dbg(0, "In single channel mode\n");
		n_channels = 1;
	} else {
		edac_dbg(0, "In dual channel mode\n");
		n_channels = 2;
	}

	/* check DDPCD - check if both channels are filled */
	if (capid0_2b & IE31200_CAPID0_DDPCD)
		edac_dbg(0, "2 DIMMS per channel disabled\n");
	else
		edac_dbg(0, "2 DIMMS per channel enabled\n");

	return n_channels;
}

static bool ecc_capable(struct pci_dev *pdev)
{
	unsigned char capid0_4b; /* 4th byte of CAPID0 */

	pci_read_config_byte(pdev, IE31200_CAPID0 + 3, &capid0_4b);
	if (capid0_4b & IE31200_CAPID0_ECC)
		return false;
	return true;
}

static int eccerrlog_row(int channel, u64 log)
{
	int rank = ((log & IE31200_ECCERRLOG_RANK_BITS) >>
		IE31200_ECCERRLOG_RANK_SHIFT);
	return rank | (channel * IE31200_RANKS_PER_CHANNEL);
}

static void ie31200_clear_error_info(struct mem_ctl_info *mci)
{
	/*
	 * Clear any error bits.
	 * (Yes, we really clear bits by writing 1 to them.)
	 */
	pci_write_bits16(to_pci_dev(mci->pdev), IE31200_ERRSTS,
			 IE31200_ERRSTS_BITS, IE31200_ERRSTS_BITS);
}

static void ie31200_get_and_clear_error_info(struct mem_ctl_info *mci,
					     struct ie31200_error_info *info)
{
	struct pci_dev *pdev;
	struct ie31200_priv *priv = mci->pvt_info;
	void __iomem *window = priv->window;

	pdev = to_pci_dev(mci->pdev);

	/*
	 * This is a mess because there is no atomic way to read all the
	 * registers at once and the registers can transition from CE being
	 * overwritten by UE.
	 */
	pci_read_config_word(pdev, IE31200_ERRSTS, &info->errsts);
	if (!(info->errsts & IE31200_ERRSTS_BITS))
		return;

	info->eccerrlog[0] = lo_hi_readq(window + IE31200_C0ECCERRLOG);
	if (nr_channels == 2)
		info->eccerrlog[1] = lo_hi_readq(window + IE31200_C1ECCERRLOG);

	pci_read_config_word(pdev, IE31200_ERRSTS, &info->errsts2);

	/*
	 * If the error is the same for both reads then the first set
	 * of reads is valid.  If there is a change then there is a CE
	 * with no info and the second set of reads is valid and
	 * should be UE info.
	 */
	if ((info->errsts ^ info->errsts2) & IE31200_ERRSTS_BITS) {
		info->eccerrlog[0] = lo_hi_readq(window + IE31200_C0ECCERRLOG);
		if (nr_channels == 2)
			info->eccerrlog[1] =
				lo_hi_readq(window + IE31200_C1ECCERRLOG);
	}

	ie31200_clear_error_info(mci);
}

static void ie31200_process_error_info(struct mem_ctl_info *mci,
				       struct ie31200_error_info *info)
{
	int channel;
	u64 log;

	if (!(info->errsts & IE31200_ERRSTS_BITS))
		return;

	if ((info->errsts ^ info->errsts2) & IE31200_ERRSTS_BITS) {
		edac_mc_handle_error(HW_EVENT_ERR_UNCORRECTED, mci, 1, 0, 0, 0,
				     -1, -1, -1, "UE overwrote CE", "");
		info->errsts = info->errsts2;
	}

	for (channel = 0; channel < nr_channels; channel++) {
		log = info->eccerrlog[channel];
		if (log & IE31200_ECCERRLOG_UE) {
			edac_mc_handle_error(HW_EVENT_ERR_UNCORRECTED, mci, 1,
					     0, 0, 0,
					     eccerrlog_row(channel, log),
					     channel, -1,
					     "ie31200 UE", "");
		} else if (log & IE31200_ECCERRLOG_CE) {
			edac_mc_handle_error(HW_EVENT_ERR_CORRECTED, mci, 1,
					     0, 0,
					     IE31200_ECCERRLOG_SYNDROME(log),
					     eccerrlog_row(channel, log),
					     channel, -1,
					     "ie31200 CE", "");
		}
	}
}

static void ie31200_check(struct mem_ctl_info *mci)
{
	struct ie31200_error_info info;

	edac_dbg(1, "MC%d\n", mci->mc_idx);
	ie31200_get_and_clear_error_info(mci, &info);
	ie31200_process_error_info(mci, &info);
}

static void __iomem *ie31200_map_mchbar(struct pci_dev *pdev)
{
	union {
		u64 mchbar;
		struct {
			u32 mchbar_low;
			u32 mchbar_high;
		};
	} u;
	void __iomem *window;

	pci_read_config_dword(pdev, IE31200_MCHBAR_LOW, &u.mchbar_low);
	pci_read_config_dword(pdev, IE31200_MCHBAR_HIGH, &u.mchbar_high);
	u.mchbar &= IE31200_MCHBAR_MASK;

	if (u.mchbar != (resource_size_t)u.mchbar) {
		ie31200_printk(KERN_ERR, "mmio space beyond accessible range (0x%llx)\n",
			       (unsigned long long)u.mchbar);
		return NULL;
	}

	window = ioremap_nocache(u.mchbar, IE31200_MMR_WINDOW_SIZE);
	if (!window)
		ie31200_printk(KERN_ERR, "Cannot map mmio space at 0x%llx\n",
			       (unsigned long long)u.mchbar);

	return window;
}

static int ie31200_probe1(struct pci_dev *pdev, int dev_idx)
{
	int i, j, ret;
	struct mem_ctl_info *mci = NULL;
	struct edac_mc_layer layers[2];
	struct dimm_data dimm_info[IE31200_CHANNELS][IE31200_DIMMS_PER_CHANNEL];
	void __iomem *window;
	struct ie31200_priv *priv;
	u32 addr_decode;

	edac_dbg(0, "MC:\n");

	if (!ecc_capable(pdev)) {
		ie31200_printk(KERN_INFO, "No ECC support\n");
		return -ENODEV;
	}

	nr_channels = how_many_channels(pdev);
	layers[0].type = EDAC_MC_LAYER_CHIP_SELECT;
	layers[0].size = IE31200_DIMMS;
	layers[0].is_virt_csrow = true;
	layers[1].type = EDAC_MC_LAYER_CHANNEL;
	layers[1].size = nr_channels;
	layers[1].is_virt_csrow = false;
	mci = edac_mc_alloc(0, ARRAY_SIZE(layers), layers,
			    sizeof(struct ie31200_priv));
	if (!mci)
		return -ENOMEM;

	window = ie31200_map_mchbar(pdev);
	if (!window) {
		ret = -ENODEV;
		goto fail_free;
	}

	edac_dbg(3, "MC: init mci\n");
	mci->pdev = &pdev->dev;
	mci->mtype_cap = MEM_FLAG_DDR3;
	mci->edac_ctl_cap = EDAC_FLAG_SECDED;
	mci->edac_cap = EDAC_FLAG_SECDED;
	mci->mod_name = EDAC_MOD_STR;
	mci->mod_ver = IE31200_REVISION;
	mci->ctl_name = ie31200_devs[dev_idx].ctl_name;
	mci->dev_name = pci_name(pdev);
	mci->edac_check = ie31200_check;
	mci->ctl_page_to_phys = NULL;
	priv = mci->pvt_info;
	priv->window = window;

	/* populate DIMM info */
	for (i = 0; i < IE31200_CHANNELS; i++) {
		addr_decode = readl(window + IE31200_MAD_DIMM_0_OFFSET +
					(i * 4));
		edac_dbg(0, "addr_decode: 0x%x\n", addr_decode);
		for (j = 0; j < IE31200_DIMMS_PER_CHANNEL; j++) {
			dimm_info[i][j].size = (addr_decode >> (j * 8)) &
						IE31200_MAD_DIMM_SIZE;
			dimm_info[i][j].dual_rank = (addr_decode &
				(IE31200_MAD_DIMM_A_RANK << j)) ? 1 : 0;
			dimm_info[i][j].x16_width = (addr_decode &
				(IE31200_MAD_DIMM_A_WIDTH << j)) ? 1 : 0;
			edac_dbg(0, "size: 0x%x, rank: %d, width: %d\n",
				 dimm_info[i][j].size,
				 dimm_info[i][j].dual_rank,
				 dimm_info[i][j].x16_width);
		}
	}

	/*
	 * The dram rank boundary (DRB) reg values are boundary addresses
	 * for each DRAM rank with a granularity of 64MB.  DRB regs are
	 * cumulative; the last one will contain the total memory
	 * contained in all ranks.
	 */
	for (i = 0; i < IE31200_DIMMS_PER_CHANNEL; i++) {
		for (j = 0; j < IE31200_CHANNELS; j++) {
			struct dimm_info *dimm;
			unsigned long nr_pages;

			nr_pages = IE31200_PAGES(dimm_info[j][i].size);
			if (nr_pages == 0)
				continue;

			if (dimm_info[j][i].dual_rank) {
				nr_pages = nr_pages / 2;
				dimm = EDAC_DIMM_PTR(mci->layers, mci->dimms,
						     mci->n_layers, (i * 2) + 1,
						     j, 0);
				dimm->nr_pages = nr_pages;
				edac_dbg(0, "set nr pages: 0x%lx\n", nr_pages);
				dimm->grain = 8; /* just a guess */
				dimm->mtype = MEM_DDR3;
				dimm->dtype = DEV_UNKNOWN;
				dimm->edac_mode = EDAC_UNKNOWN;
			}
			dimm = EDAC_DIMM_PTR(mci->layers, mci->dimms,
					     mci->n_layers, i * 2, j, 0);
			dimm->nr_pages = nr_pages;
			edac_dbg(0, "set nr pages: 0x%lx\n", nr_pages);
			dimm->grain = 8; /* same guess */
			dimm->mtype = MEM_DDR3;
			dimm->dtype = DEV_UNKNOWN;
			dimm->edac_mode = EDAC_UNKNOWN;
		}
	}

	ie31200_clear_error_info(mci);

	if (edac_mc_add_mc(mci)) {
		edac_dbg(3, "MC: failed edac_mc_add_mc()\n");
		ret = -ENODEV;
		goto fail_unmap;
	}

	/* get this far and it's successful */
	edac_dbg(3, "MC: success\n");
	return 0;

fail_unmap:
	iounmap(window);

fail_free:
	edac_mc_free(mci);

	return ret;
}

static int ie31200_init_one(struct pci_dev *pdev,
			    const struct pci_device_id *ent)
{
	edac_dbg(0, "MC:\n");

	if (pci_enable_device(pdev) < 0)
		return -EIO;

	return ie31200_probe1(pdev, ent->driver_data);
}

static void ie31200_remove_one(struct pci_dev *pdev)
{
	struct mem_ctl_info *mci;
	struct ie31200_priv *priv;

	edac_dbg(0, "\n");
	mci = edac_mc_del_mc(&pdev->dev);
	if (!mci)
		return;
	priv = mci->pvt_info;
	iounmap(priv->window);
	edac_mc_free(mci);
}

static const struct pci_device_id ie31200_pci_tbl[] = {
	{
		PCI_VEND_DEV(INTEL, IE31200_HB_1), PCI_ANY_ID, PCI_ANY_ID, 0, 0,
		IE31200},
	{
		PCI_VEND_DEV(INTEL, IE31200_HB_2), PCI_ANY_ID, PCI_ANY_ID, 0, 0,
		IE31200},
	{
		PCI_VEND_DEV(INTEL, IE31200_HB_3), PCI_ANY_ID, PCI_ANY_ID, 0, 0,
		IE31200},
	{
		PCI_VEND_DEV(INTEL, IE31200_HB_4), PCI_ANY_ID, PCI_ANY_ID, 0, 0,
		IE31200},
	{
		PCI_VEND_DEV(INTEL, IE31200_HB_5), PCI_ANY_ID, PCI_ANY_ID, 0, 0,
		IE31200},
	{
		PCI_VEND_DEV(INTEL, IE31200_HB_6), PCI_ANY_ID, PCI_ANY_ID, 0, 0,
		IE31200},
	{
		PCI_VEND_DEV(INTEL, IE31200_HB_7), PCI_ANY_ID, PCI_ANY_ID, 0, 0,
		IE31200},
	{
		0,
	}            /* 0 terminated list. */
};
MODULE_DEVICE_TABLE(pci, ie31200_pci_tbl);

static struct pci_driver ie31200_driver = {
	.name = EDAC_MOD_STR,
	.probe = ie31200_init_one,
	.remove = ie31200_remove_one,
	.id_table = ie31200_pci_tbl,
};

static int __init ie31200_init(void)
{
	edac_dbg(3, "MC:\n");
	/* Ensure that the OPSTATE is set correctly for POLL or NMI */
	opstate_init();

	return pci_register_driver(&ie31200_driver);
}

static void __exit ie31200_exit(void)
{
	edac_dbg(3, "MC:\n");
	pci_unregister_driver(&ie31200_driver);
}

module_init(ie31200_init);
module_exit(ie31200_exit);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Jason Baron <jbaron@akamai.com>");
MODULE_DESCRIPTION("MC support for Intel Processor E31200 memory hub controllers");
Commit	Line	Data
7ee40b89 JB	1	/*
	2	* Intel E3-1200
	3	* Copyright (C) 2014 Jason Baron <jbaron@akamai.com>
	4	*
	5	* Support for the E3-1200 processor family. Heavily based on previous
	6	* Intel EDAC drivers.
	7	*
	8	* Since the DRAM controller is on the cpu chip, we can use its PCI device
	9	* id to identify these processors.
	10	*
	11	* PCI DRAM controller device ids (Taken from The PCI ID Repository - http://pci-ids.ucw.cz/)
	12	*
	13	* 0108: Xeon E3-1200 Processor Family DRAM Controller
	14	* 010c: Xeon E3-1200/2nd Generation Core Processor Family DRAM Controller
	15	* 0150: Xeon E3-1200 v2/3rd Gen Core processor DRAM Controller
	16	* 0158: Xeon E3-1200 v2/Ivy Bridge DRAM Controller
	17	* 015c: Xeon E3-1200 v2/3rd Gen Core processor DRAM Controller
	18	* 0c04: Xeon E3-1200 v3/4th Gen Core Processor DRAM Controller
	19	* 0c08: Xeon E3-1200 v3 Processor DRAM Controller
	20	*
	21	* Based on Intel specification:
	22	* http://www.intel.com/content/dam/www/public/us/en/documents/datasheets/xeon-e3-1200v3-vol-2-datasheet.pdf
	23	* http://www.intel.com/content/www/us/en/processors/xeon/xeon-e3-1200-family-vol-2-datasheet.html
	24	*
	25	* According to the above datasheet (p.16):
	26	* "
	27	* 6. Software must not access B0/D0/F0 32-bit memory-mapped registers with
	28	* requests that cross a DW boundary.
	29	* "
	30	*
	31	* Thus, we make use of the explicit: lo_hi_readq(), which breaks the readq into
	32	* 2 readl() calls. This restriction may be lifted in subsequent chip releases,
	33	* but lo_hi_readq() ensures that we are safe across all e3-1200 processors.
	34	*/
	35
	36	#include <linux/module.h>
	37	#include <linux/init.h>
	38	#include <linux/pci.h>
	39	#include <linux/pci_ids.h>
	40	#include <linux/edac.h>
	41
2f8e2c87	42	#include <linux/io-64-nonatomic-lo-hi.h>
7ee40b89 JB	43	#include "edac_core.h"
	44
	45	#define IE31200_REVISION "1.0"
	46	#define EDAC_MOD_STR "ie31200_edac"
	47
	48	#define ie31200_printk(level, fmt, arg...) \
	49	edac_printk(level, "ie31200", fmt, ##arg)
	50
	51	#define PCI_DEVICE_ID_INTEL_IE31200_HB_1 0x0108
	52	#define PCI_DEVICE_ID_INTEL_IE31200_HB_2 0x010c
	53	#define PCI_DEVICE_ID_INTEL_IE31200_HB_3 0x0150
	54	#define PCI_DEVICE_ID_INTEL_IE31200_HB_4 0x0158
	55	#define PCI_DEVICE_ID_INTEL_IE31200_HB_5 0x015c
	56	#define PCI_DEVICE_ID_INTEL_IE31200_HB_6 0x0c04
	57	#define PCI_DEVICE_ID_INTEL_IE31200_HB_7 0x0c08
	58
	59	#define IE31200_DIMMS 4
	60	#define IE31200_RANKS 8
	61	#define IE31200_RANKS_PER_CHANNEL 4
	62	#define IE31200_DIMMS_PER_CHANNEL 2
	63	#define IE31200_CHANNELS 2
	64
	65	/* Intel IE31200 register addresses - device 0 function 0 - DRAM Controller */
	66	#define IE31200_MCHBAR_LOW 0x48
	67	#define IE31200_MCHBAR_HIGH 0x4c
	68	#define IE31200_MCHBAR_MASK GENMASK_ULL(38, 15)
	69	#define IE31200_MMR_WINDOW_SIZE BIT(15)
	70
	71	/*
	72	* Error Status Register (16b)
	73	*
	74	* 15 reserved
	75	* 14 Isochronous TBWRR Run Behind FIFO Full
	76	* (ITCV)
	77	* 13 Isochronous TBWRR Run Behind FIFO Put
	78	* (ITSTV)
	79	* 12 reserved
	80	* 11 MCH Thermal Sensor Event
	81	* for SMI/SCI/SERR (GTSE)
	82	* 10 reserved
	83	* 9 LOCK to non-DRAM Memory Flag (LCKF)
	84	* 8 reserved
	85	* 7 DRAM Throttle Flag (DTF)
	86	* 6:2 reserved
	87	* 1 Multi-bit DRAM ECC Error Flag (DMERR)
	88	* 0 Single-bit DRAM ECC Error Flag (DSERR)
	89	*/
	90	#define IE31200_ERRSTS 0xc8
	91	#define IE31200_ERRSTS_UE BIT(1)
	92	#define IE31200_ERRSTS_CE BIT(0)
	93	#define IE31200_ERRSTS_BITS (IE31200_ERRSTS_UE \| IE31200_ERRSTS_CE)
	94
	95	/*
	96	* Channel 0 ECC Error Log (64b)
	97	*
	98	* 63:48 Error Column Address (ERRCOL)
	99	* 47:32 Error Row Address (ERRROW)
	100	* 31:29 Error Bank Address (ERRBANK)
	101	* 28:27 Error Rank Address (ERRRANK)
	102	* 26:24 reserved
	103	* 23:16 Error Syndrome (ERRSYND)
	104	* 15: 2 reserved
	105	* 1 Multiple Bit Error Status (MERRSTS)
	106	* 0 Correctable Error Status (CERRSTS)
107	*/
108	#define IE31200_C0ECCERRLOG 0x40c8
109	#define IE31200_C1ECCERRLOG 0x44c8
110	#define IE31200_ECCERRLOG_CE BIT(0)
111	#define IE31200_ECCERRLOG_UE BIT(1)
112	#define IE31200_ECCERRLOG_RANK_BITS GENMASK_ULL(28, 27)
113	#define IE31200_ECCERRLOG_RANK_SHIFT 27
114	#define IE31200_ECCERRLOG_SYNDROME_BITS GENMASK_ULL(23, 16)
115	#define IE31200_ECCERRLOG_SYNDROME_SHIFT 16
116
117	#define IE31200_ECCERRLOG_SYNDROME(log) \
118	((log & IE31200_ECCERRLOG_SYNDROME_BITS) >> \
119	IE31200_ECCERRLOG_SYNDROME_SHIFT)
120
121	#define IE31200_CAPID0 0xe4
122	#define IE31200_CAPID0_PDCD BIT(4)
123	#define IE31200_CAPID0_DDPCD BIT(6)
124	#define IE31200_CAPID0_ECC BIT(1)
125
126	#define IE31200_MAD_DIMM_0_OFFSET 0x5004
127	#define IE31200_MAD_DIMM_SIZE GENMASK_ULL(7, 0)
128	#define IE31200_MAD_DIMM_A_RANK BIT(17)
129	#define IE31200_MAD_DIMM_A_WIDTH BIT(19)
130
131	#define IE31200_PAGES(n) (n << (28 - PAGE_SHIFT))
132
133	static int nr_channels;
134
135	struct ie31200_priv {
136	void __iomem *window;
137	};
138
139	enum ie31200_chips {
140	IE31200 = 0,
141	};
142
143	struct ie31200_dev_info {
144	const char *ctl_name;
145	};
146
147	struct ie31200_error_info {
148	u16 errsts;
149	u16 errsts2;
150	u64 eccerrlog[IE31200_CHANNELS];
151	};
152
153	static const struct ie31200_dev_info ie31200_devs[] = {
154	[IE31200] = {
155	.ctl_name = "IE31200"
156	},
157	};
158
159	struct dimm_data {
160	u8 size; /* in 256MB multiples */
161	u8 dual_rank : 1,
162	x16_width : 1; /* 0 means x8 width */
163	};
164
165	static int how_many_channels(struct pci_dev *pdev)
166	{
167	int n_channels;
168	unsigned char capid0_2b; /* 2nd byte of CAPID0 */
169
170	pci_read_config_byte(pdev, IE31200_CAPID0 + 1, &capid0_2b);
171
172	/* check PDCD: Dual Channel Disable */
173	if (capid0_2b & IE31200_CAPID0_PDCD) {
174	edac_dbg(0, "In single channel mode\n");
175	n_channels = 1;
176	} else {
177	edac_dbg(0, "In dual channel mode\n");
178	n_channels = 2;
179	}
180
181	/* check DDPCD - check if both channels are filled */
182	if (capid0_2b & IE31200_CAPID0_DDPCD)
183	edac_dbg(0, "2 DIMMS per channel disabled\n");
184	else
185	edac_dbg(0, "2 DIMMS per channel enabled\n");
186
187	return n_channels;
188	}
189
190	static bool ecc_capable(struct pci_dev *pdev)
191	{
192	unsigned char capid0_4b; /* 4th byte of CAPID0 */
193
194	pci_read_config_byte(pdev, IE31200_CAPID0 + 3, &capid0_4b);
195	if (capid0_4b & IE31200_CAPID0_ECC)
196	return false;
197	return true;
198	}
199
200	static int eccerrlog_row(int channel, u64 log)
201	{
202	int rank = ((log & IE31200_ECCERRLOG_RANK_BITS) >>
203	IE31200_ECCERRLOG_RANK_SHIFT);
204	return rank \| (channel * IE31200_RANKS_PER_CHANNEL);
205	}
206
207	static void ie31200_clear_error_info(struct mem_ctl_info *mci)
208	{
209	/*
210	* Clear any error bits.
211	* (Yes, we really clear bits by writing 1 to them.)
212	*/
213	pci_write_bits16(to_pci_dev(mci->pdev), IE31200_ERRSTS,
214	IE31200_ERRSTS_BITS, IE31200_ERRSTS_BITS);
215	}
216
217	static void ie31200_get_and_clear_error_info(struct mem_ctl_info *mci,
218	struct ie31200_error_info *info)
219	{
220	struct pci_dev *pdev;
221	struct ie31200_priv *priv = mci->pvt_info;
222	void __iomem *window = priv->window;
223
224	pdev = to_pci_dev(mci->pdev);
225
226	/*
227	* This is a mess because there is no atomic way to read all the
228	* registers at once and the registers can transition from CE being
229	* overwritten by UE.
230	*/
231	pci_read_config_word(pdev, IE31200_ERRSTS, &info->errsts);
232	if (!(info->errsts & IE31200_ERRSTS_BITS))
233	return;
234
235	info->eccerrlog[0] = lo_hi_readq(window + IE31200_C0ECCERRLOG);
236	if (nr_channels == 2)
237	info->eccerrlog[1] = lo_hi_readq(window + IE31200_C1ECCERRLOG);
238
239	pci_read_config_word(pdev, IE31200_ERRSTS, &info->errsts2);
240
241	/*
242	* If the error is the same for both reads then the first set
243	* of reads is valid. If there is a change then there is a CE
244	* with no info and the second set of reads is valid and
245	* should be UE info.
246	*/
247	if ((info->errsts ^ info->errsts2) & IE31200_ERRSTS_BITS) {
248	info->eccerrlog[0] = lo_hi_readq(window + IE31200_C0ECCERRLOG);
249	if (nr_channels == 2)
250	info->eccerrlog[1] =
251	lo_hi_readq(window + IE31200_C1ECCERRLOG);
252	}
253
254	ie31200_clear_error_info(mci);
255	}
256
257	static void ie31200_process_error_info(struct mem_ctl_info *mci,
258	struct ie31200_error_info *info)
259	{
260	int channel;
261	u64 log;
262
263	if (!(info->errsts & IE31200_ERRSTS_BITS))
264	return;
265
266	if ((info->errsts ^ info->errsts2) & IE31200_ERRSTS_BITS) {
267	edac_mc_handle_error(HW_EVENT_ERR_UNCORRECTED, mci, 1, 0, 0, 0,
268	-1, -1, -1, "UE overwrote CE", "");
269	info->errsts = info->errsts2;
270	}
271
272	for (channel = 0; channel < nr_channels; channel++) {
273	log = info->eccerrlog[channel];
274	if (log & IE31200_ECCERRLOG_UE) {
275	edac_mc_handle_error(HW_EVENT_ERR_UNCORRECTED, mci, 1,
276	0, 0, 0,
277	eccerrlog_row(channel, log),
278	channel, -1,
279	"ie31200 UE", "");
280	} else if (log & IE31200_ECCERRLOG_CE) {
281	edac_mc_handle_error(HW_EVENT_ERR_CORRECTED, mci, 1,
282	0, 0,
283	IE31200_ECCERRLOG_SYNDROME(log),
284	eccerrlog_row(channel, log),
285	channel, -1,
286	"ie31200 CE", "");
287	}
288	}
289	}
290
291	static void ie31200_check(struct mem_ctl_info *mci)
292	{
293	struct ie31200_error_info info;
294
295	edac_dbg(1, "MC%d\n", mci->mc_idx);
296	ie31200_get_and_clear_error_info(mci, &info);
297	ie31200_process_error_info(mci, &info);
298	}
299
300	static void __iomem ie31200_map_mchbar(struct pci_dev pdev)
301	{
302	union {
303	u64 mchbar;
304	struct {
305	u32 mchbar_low;
306	u32 mchbar_high;
307	};
308	} u;
309	void __iomem *window;
310
311	pci_read_config_dword(pdev, IE31200_MCHBAR_LOW, &u.mchbar_low);
312	pci_read_config_dword(pdev, IE31200_MCHBAR_HIGH, &u.mchbar_high);
313	u.mchbar &= IE31200_MCHBAR_MASK;
314
315	if (u.mchbar != (resource_size_t)u.mchbar) {
316	ie31200_printk(KERN_ERR, "mmio space beyond accessible range (0x%llx)\n",
317	(unsigned long long)u.mchbar);
318	return NULL;
319	}
320
321	window = ioremap_nocache(u.mchbar, IE31200_MMR_WINDOW_SIZE);
322	if (!window)
323	ie31200_printk(KERN_ERR, "Cannot map mmio space at 0x%llx\n",
324	(unsigned long long)u.mchbar);
325
326	return window;
327	}
328
329	static int ie31200_probe1(struct pci_dev *pdev, int dev_idx)
330	{
78fd4d12	331	int i, j, ret;
7ee40b89 JB	332	struct mem_ctl_info *mci = NULL;
	333	struct edac_mc_layer layers[2];
	334	struct dimm_data dimm_info[IE31200_CHANNELS][IE31200_DIMMS_PER_CHANNEL];
	335	void __iomem *window;
	336	struct ie31200_priv *priv;
	337	u32 addr_decode;
	338
	339	edac_dbg(0, "MC:\n");
	340
	341	if (!ecc_capable(pdev)) {
	342	ie31200_printk(KERN_INFO, "No ECC support\n");
	343	return -ENODEV;
	344	}
	345
7ee40b89	346	nr_channels = how_many_channels(pdev);
7ee40b89 JB	347	layers[0].type = EDAC_MC_LAYER_CHIP_SELECT;
	348	layers[0].size = IE31200_DIMMS;
	349	layers[0].is_virt_csrow = true;
	350	layers[1].type = EDAC_MC_LAYER_CHANNEL;
	351	layers[1].size = nr_channels;
	352	layers[1].is_virt_csrow = false;
	353	mci = edac_mc_alloc(0, ARRAY_SIZE(layers), layers,
	354	sizeof(struct ie31200_priv));
7ee40b89	355	if (!mci)
78fd4d12	356	return -ENOMEM;
7ee40b89	357
78fd4d12 JB	358	window = ie31200_map_mchbar(pdev);
	359	if (!window) {
	360	ret = -ENODEV;
	361	goto fail_free;
	362	}
7ee40b89	363
78fd4d12	364	edac_dbg(3, "MC: init mci\n");
7ee40b89 JB	365	mci->pdev = &pdev->dev;
7ee40b89 JB	366	mci->mtype_cap = MEM_FLAG_DDR3;
7ee40b89 JB	367	mci->edac_ctl_cap = EDAC_FLAG_SECDED;
7ee40b89 JB	368	mci->edac_cap = EDAC_FLAG_SECDED;
7ee40b89 JB	369	mci->mod_name = EDAC_MOD_STR;
	370	mci->mod_ver = IE31200_REVISION;
	371	mci->ctl_name = ie31200_devs[dev_idx].ctl_name;
	372	mci->dev_name = pci_name(pdev);
	373	mci->edac_check = ie31200_check;
	374	mci->ctl_page_to_phys = NULL;
	375	priv = mci->pvt_info;
	376	priv->window = window;
	377
78fd4d12 JB	378	/* populate DIMM info */
	379	for (i = 0; i < IE31200_CHANNELS; i++) {
	380	addr_decode = readl(window + IE31200_MAD_DIMM_0_OFFSET +
	381	(i * 4));
	382	edac_dbg(0, "addr_decode: 0x%x\n", addr_decode);
	383	for (j = 0; j < IE31200_DIMMS_PER_CHANNEL; j++) {
	384	dimm_info[i][j].size = (addr_decode >> (j * 8)) &
	385	IE31200_MAD_DIMM_SIZE;
	386	dimm_info[i][j].dual_rank = (addr_decode &
	387	(IE31200_MAD_DIMM_A_RANK << j)) ? 1 : 0;
	388	dimm_info[i][j].x16_width = (addr_decode &
	389	(IE31200_MAD_DIMM_A_WIDTH << j)) ? 1 : 0;
	390	edac_dbg(0, "size: 0x%x, rank: %d, width: %d\n",
	391	dimm_info[i][j].size,
	392	dimm_info[i][j].dual_rank,
	393	dimm_info[i][j].x16_width);
	394	}
	395	}
	396
7ee40b89 JB	397	/*
	398	* The dram rank boundary (DRB) reg values are boundary addresses
	399	* for each DRAM rank with a granularity of 64MB. DRB regs are
	400	* cumulative; the last one will contain the total memory
	401	* contained in all ranks.
	402	*/
	403	for (i = 0; i < IE31200_DIMMS_PER_CHANNEL; i++) {
	404	for (j = 0; j < IE31200_CHANNELS; j++) {
	405	struct dimm_info *dimm;
	406	unsigned long nr_pages;
	407
	408	nr_pages = IE31200_PAGES(dimm_info[j][i].size);
	409	if (nr_pages == 0)
	410	continue;
	411
	412	if (dimm_info[j][i].dual_rank) {
	413	nr_pages = nr_pages / 2;
	414	dimm = EDAC_DIMM_PTR(mci->layers, mci->dimms,
	415	mci->n_layers, (i * 2) + 1,
	416	j, 0);
	417	dimm->nr_pages = nr_pages;
	418	edac_dbg(0, "set nr pages: 0x%lx\n", nr_pages);
	419	dimm->grain = 8; /* just a guess */
	420	dimm->mtype = MEM_DDR3;
	421	dimm->dtype = DEV_UNKNOWN;
	422	dimm->edac_mode = EDAC_UNKNOWN;
	423	}
	424	dimm = EDAC_DIMM_PTR(mci->layers, mci->dimms,
	425	mci->n_layers, i * 2, j, 0);
	426	dimm->nr_pages = nr_pages;
	427	edac_dbg(0, "set nr pages: 0x%lx\n", nr_pages);
	428	dimm->grain = 8; /* same guess */
	429	dimm->mtype = MEM_DDR3;
	430	dimm->dtype = DEV_UNKNOWN;
	431	dimm->edac_mode = EDAC_UNKNOWN;
	432	}
	433	}
	434
	435	ie31200_clear_error_info(mci);
	436
7ee40b89 JB	437	if (edac_mc_add_mc(mci)) {
7ee40b89 JB	438	edac_dbg(3, "MC: failed edac_mc_add_mc()\n");
78fd4d12 JB	439	ret = -ENODEV;
78fd4d12 JB	440	goto fail_unmap;
7ee40b89 JB	441	}
	442
	443	/* get this far and it's successful */
	444	edac_dbg(3, "MC: success\n");
	445	return 0;
	446
7ee40b89 JB	447	fail_unmap:
	448	iounmap(window);
	449
78fd4d12 JB	450	fail_free:
	451	edac_mc_free(mci);
	452
	453	return ret;
7ee40b89 JB	454	}
	455
	456	static int ie31200_init_one(struct pci_dev *pdev,
	457	const struct pci_device_id *ent)
	458	{
	459	edac_dbg(0, "MC:\n");
	460
	461	if (pci_enable_device(pdev) < 0)
	462	return -EIO;
	463
	464	return ie31200_probe1(pdev, ent->driver_data);
	465	}
	466
	467	static void ie31200_remove_one(struct pci_dev *pdev)
	468	{
	469	struct mem_ctl_info *mci;
	470	struct ie31200_priv *priv;
	471
	472	edac_dbg(0, "\n");
	473	mci = edac_mc_del_mc(&pdev->dev);
	474	if (!mci)
	475	return;
	476	priv = mci->pvt_info;
	477	iounmap(priv->window);
	478	edac_mc_free(mci);
	479	}
	480
	481	static const struct pci_device_id ie31200_pci_tbl[] = {
	482	{
	483	PCI_VEND_DEV(INTEL, IE31200_HB_1), PCI_ANY_ID, PCI_ANY_ID, 0, 0,
	484	IE31200},
	485	{
	486	PCI_VEND_DEV(INTEL, IE31200_HB_2), PCI_ANY_ID, PCI_ANY_ID, 0, 0,
	487	IE31200},
	488	{
	489	PCI_VEND_DEV(INTEL, IE31200_HB_3), PCI_ANY_ID, PCI_ANY_ID, 0, 0,
	490	IE31200},
	491	{
	492	PCI_VEND_DEV(INTEL, IE31200_HB_4), PCI_ANY_ID, PCI_ANY_ID, 0, 0,
	493	IE31200},
	494	{
	495	PCI_VEND_DEV(INTEL, IE31200_HB_5), PCI_ANY_ID, PCI_ANY_ID, 0, 0,
	496	IE31200},
	497	{
	498	PCI_VEND_DEV(INTEL, IE31200_HB_6), PCI_ANY_ID, PCI_ANY_ID, 0, 0,
	499	IE31200},
	500	{
	501	PCI_VEND_DEV(INTEL, IE31200_HB_7), PCI_ANY_ID, PCI_ANY_ID, 0, 0,
	502	IE31200},
	503	{
	504	0,
	505	} /* 0 terminated list. */
	506	};
	507	MODULE_DEVICE_TABLE(pci, ie31200_pci_tbl);
	508
	509	static struct pci_driver ie31200_driver = {
	510	.name = EDAC_MOD_STR,
	511	.probe = ie31200_init_one,
	512	.remove = ie31200_remove_one,
	513	.id_table = ie31200_pci_tbl,
	514	};
	515
	516	static int __init ie31200_init(void)
	517	{
518	edac_dbg(3, "MC:\n");
519	/* Ensure that the OPSTATE is set correctly for POLL or NMI */
520	opstate_init();
521
522	return pci_register_driver(&ie31200_driver);
523	}
524
525	static void __exit ie31200_exit(void)
526	{
527	edac_dbg(3, "MC:\n");
528	pci_unregister_driver(&ie31200_driver);
529	}
530
531	module_init(ie31200_init);
532	module_exit(ie31200_exit);
533
534	MODULE_LICENSE("GPL");
535	MODULE_AUTHOR("Jason Baron <jbaron@akamai.com>");
536	MODULE_DESCRIPTION("MC support for Intel Processor E31200 memory hub controllers");