Initial import

1 files changed, 550 insertions, 0 deletions

diff --git a/drivers/edac/i3200_edac.c b/drivers/edac/i3200_edac.c
new file mode 100644
index 000000000..4ad062b0e
--- /dev/null
+++ b/drivers/edac/i3200_edac.c
@@ -0,0 +1,550 @@
+/*
+ * Intel 3200/3210 Memory Controller kernel module
+ * Copyright (C) 2008-2009 Akamai Technologies, Inc.
+ * Portions by Hitoshi Mitake <h.mitake@gmail.com>.
+ *
+ * This file may be distributed under the terms of the
+ * GNU General Public License.
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/pci.h>
+#include <linux/pci_ids.h>
+#include <linux/edac.h>
+#include <linux/io.h>
+#include "edac_core.h"
+
+#include <asm-generic/io-64-nonatomic-lo-hi.h>
+
+#define I3200_REVISION        "1.1"
+
+#define EDAC_MOD_STR        "i3200_edac"
+
+#define PCI_DEVICE_ID_INTEL_3200_HB    0x29f0
+
+#define I3200_DIMMS		4
+#define I3200_RANKS		8
+#define I3200_RANKS_PER_CHANNEL	4
+#define I3200_CHANNELS		2
+
+/* Intel 3200 register addresses - device 0 function 0 - DRAM Controller */
+
+#define I3200_MCHBAR_LOW	0x48	/* MCH Memory Mapped Register BAR */
+#define I3200_MCHBAR_HIGH	0x4c
+#define I3200_MCHBAR_MASK	0xfffffc000ULL	/* bits 35:14 */
+#define I3200_MMR_WINDOW_SIZE	16384
+
+#define I3200_TOM		0xa0	/* Top of Memory (16b)
+		 *
+		 * 15:10 reserved
+		 *  9:0  total populated physical memory
+		 */
+#define I3200_TOM_MASK		0x3ff	/* bits 9:0 */
+#define I3200_TOM_SHIFT		26	/* 64MiB grain */
+
+#define I3200_ERRSTS		0xc8	/* 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 I3200_ERRSTS_UE		0x0002
+#define I3200_ERRSTS_CE		0x0001
+#define I3200_ERRSTS_BITS	(I3200_ERRSTS_UE | I3200_ERRSTS_CE)
+
+
+/* Intel  MMIO register space - device 0 function 0 - MMR space */
+
+#define I3200_C0DRB	0x200	/* Channel 0 DRAM Rank Boundary (16b x 4)
+		 *
+		 * 15:10 reserved
+		 *  9:0  Channel 0 DRAM Rank Boundary Address
+		 */
+#define I3200_C1DRB	0x600	/* Channel 1 DRAM Rank Boundary (16b x 4) */
+#define I3200_DRB_MASK	0x3ff	/* bits 9:0 */
+#define I3200_DRB_SHIFT	26	/* 64MiB grain */
+
+#define I3200_C0ECCERRLOG	0x280	/* 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 I3200_C1ECCERRLOG		0x680	/* Chan 1 ECC Error Log (64b) */
+#define I3200_ECCERRLOG_CE		0x1
+#define I3200_ECCERRLOG_UE		0x2
+#define I3200_ECCERRLOG_RANK_BITS	0x18000000
+#define I3200_ECCERRLOG_RANK_SHIFT	27
+#define I3200_ECCERRLOG_SYNDROME_BITS	0xff0000
+#define I3200_ECCERRLOG_SYNDROME_SHIFT	16
+#define I3200_CAPID0			0xe0	/* P.95 of spec for details */
+
+struct i3200_priv {
+	void __iomem *window;
+};
+
+static int nr_channels;
+
+static int how_many_channels(struct pci_dev *pdev)
+{
+	int n_channels;
+
+	unsigned char capid0_8b; /* 8th byte of CAPID0 */
+
+	pci_read_config_byte(pdev, I3200_CAPID0 + 8, &capid0_8b);
+
+	if (capid0_8b & 0x20) { /* check DCD: Dual Channel Disable */
+		edac_dbg(0, "In single channel mode\n");
+		n_channels = 1;
+	} else {
+		edac_dbg(0, "In dual channel mode\n");
+		n_channels = 2;
+	}
+
+	if (capid0_8b & 0x10) /* check if both channels are filled */
+		edac_dbg(0, "2 DIMMS per channel disabled\n");
+	else
+		edac_dbg(0, "2 DIMMS per channel enabled\n");
+
+	return n_channels;
+}
+
+static unsigned long eccerrlog_syndrome(u64 log)
+{
+	return (log & I3200_ECCERRLOG_SYNDROME_BITS) >>
+		I3200_ECCERRLOG_SYNDROME_SHIFT;
+}
+
+static int eccerrlog_row(int channel, u64 log)
+{
+	u64 rank = ((log & I3200_ECCERRLOG_RANK_BITS) >>
+		I3200_ECCERRLOG_RANK_SHIFT);
+	return rank | (channel * I3200_RANKS_PER_CHANNEL);
+}
+
+enum i3200_chips {
+	I3200 = 0,
+};
+
+struct i3200_dev_info {
+	const char *ctl_name;
+};
+
+struct i3200_error_info {
+	u16 errsts;
+	u16 errsts2;
+	u64 eccerrlog[I3200_CHANNELS];
+};
+
+static const struct i3200_dev_info i3200_devs[] = {
+	[I3200] = {
+		.ctl_name = "i3200"
+	},
+};
+
+static struct pci_dev *mci_pdev;
+static int i3200_registered = 1;
+
+
+static void i3200_clear_error_info(struct mem_ctl_info *mci)
+{
+	struct pci_dev *pdev;
+
+	pdev = to_pci_dev(mci->pdev);
+
+	/*
+	 * Clear any error bits.
+	 * (Yes, we really clear bits by writing 1 to them.)
+	 */
+	pci_write_bits16(pdev, I3200_ERRSTS, I3200_ERRSTS_BITS,
+		I3200_ERRSTS_BITS);
+}
+
+static void i3200_get_and_clear_error_info(struct mem_ctl_info *mci,
+		struct i3200_error_info *info)
+{
+	struct pci_dev *pdev;
+	struct i3200_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, I3200_ERRSTS, &info->errsts);
+	if (!(info->errsts & I3200_ERRSTS_BITS))
+		return;
+
+	info->eccerrlog[0] = readq(window + I3200_C0ECCERRLOG);
+	if (nr_channels == 2)
+		info->eccerrlog[1] = readq(window + I3200_C1ECCERRLOG);
+
+	pci_read_config_word(pdev, I3200_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) & I3200_ERRSTS_BITS) {
+		info->eccerrlog[0] = readq(window + I3200_C0ECCERRLOG);
+		if (nr_channels == 2)
+			info->eccerrlog[1] = readq(window + I3200_C1ECCERRLOG);
+	}
+
+	i3200_clear_error_info(mci);
+}
+
+static void i3200_process_error_info(struct mem_ctl_info *mci,
+		struct i3200_error_info *info)
+{
+	int channel;
+	u64 log;
+
+	if (!(info->errsts & I3200_ERRSTS_BITS))
+		return;
+
+	if ((info->errsts ^ info->errsts2) & I3200_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 & I3200_ECCERRLOG_UE) {
+			edac_mc_handle_error(HW_EVENT_ERR_UNCORRECTED, mci, 1,
+					     0, 0, 0,
+					     eccerrlog_row(channel, log),
+					     -1, -1,
+					     "i3000 UE", "");
+		} else if (log & I3200_ECCERRLOG_CE) {
+			edac_mc_handle_error(HW_EVENT_ERR_CORRECTED, mci, 1,
+					     0, 0, eccerrlog_syndrome(log),
+					     eccerrlog_row(channel, log),
+					     -1, -1,
+					     "i3000 CE", "");
+		}
+	}
+}
+
+static void i3200_check(struct mem_ctl_info *mci)
+{
+	struct i3200_error_info info;
+
+	edac_dbg(1, "MC%d\n", mci->mc_idx);
+	i3200_get_and_clear_error_info(mci, &info);
+	i3200_process_error_info(mci, &info);
+}
+
+static void __iomem *i3200_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, I3200_MCHBAR_LOW, &u.mchbar_low);
+	pci_read_config_dword(pdev, I3200_MCHBAR_HIGH, &u.mchbar_high);
+	u.mchbar &= I3200_MCHBAR_MASK;
+
+	if (u.mchbar != (resource_size_t)u.mchbar) {
+		printk(KERN_ERR
+			"i3200: mmio space beyond accessible range (0x%llx)\n",
+			(unsigned long long)u.mchbar);
+		return NULL;
+	}
+
+	window = ioremap_nocache(u.mchbar, I3200_MMR_WINDOW_SIZE);
+	if (!window)
+		printk(KERN_ERR "i3200: cannot map mmio space at 0x%llx\n",
+			(unsigned long long)u.mchbar);
+
+	return window;
+}
+
+
+static void i3200_get_drbs(void __iomem *window,
+	u16 drbs[I3200_CHANNELS][I3200_RANKS_PER_CHANNEL])
+{
+	int i;
+
+	for (i = 0; i < I3200_RANKS_PER_CHANNEL; i++) {
+		drbs[0][i] = readw(window + I3200_C0DRB + 2*i) & I3200_DRB_MASK;
+		drbs[1][i] = readw(window + I3200_C1DRB + 2*i) & I3200_DRB_MASK;
+
+		edac_dbg(0, "drb[0][%d] = %d, drb[1][%d] = %d\n", i, drbs[0][i], i, drbs[1][i]);
+	}
+}
+
+static bool i3200_is_stacked(struct pci_dev *pdev,
+	u16 drbs[I3200_CHANNELS][I3200_RANKS_PER_CHANNEL])
+{
+	u16 tom;
+
+	pci_read_config_word(pdev, I3200_TOM, &tom);
+	tom &= I3200_TOM_MASK;
+
+	return drbs[I3200_CHANNELS - 1][I3200_RANKS_PER_CHANNEL - 1] == tom;
+}
+
+static unsigned long drb_to_nr_pages(
+	u16 drbs[I3200_CHANNELS][I3200_RANKS_PER_CHANNEL], bool stacked,
+	int channel, int rank)
+{
+	int n;
+
+	n = drbs[channel][rank];
+	if (!n)
+		return 0;
+
+	if (rank > 0)
+		n -= drbs[channel][rank - 1];
+	if (stacked && (channel == 1) &&
+	drbs[channel][rank] == drbs[channel][I3200_RANKS_PER_CHANNEL - 1])
+		n -= drbs[0][I3200_RANKS_PER_CHANNEL - 1];
+
+	n <<= (I3200_DRB_SHIFT - PAGE_SHIFT);
+	return n;
+}
+
+static int i3200_probe1(struct pci_dev *pdev, int dev_idx)
+{
+	int rc;
+	int i, j;
+	struct mem_ctl_info *mci = NULL;
+	struct edac_mc_layer layers[2];
+	u16 drbs[I3200_CHANNELS][I3200_RANKS_PER_CHANNEL];
+	bool stacked;
+	void __iomem *window;
+	struct i3200_priv *priv;
+
+	edac_dbg(0, "MC:\n");
+
+	window = i3200_map_mchbar(pdev);
+	if (!window)
+		return -ENODEV;
+
+	i3200_get_drbs(window, drbs);
+	nr_channels = how_many_channels(pdev);
+
+	layers[0].type = EDAC_MC_LAYER_CHIP_SELECT;
+	layers[0].size = I3200_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 i3200_priv));
+	if (!mci)
+		return -ENOMEM;
+
+	edac_dbg(3, "MC: init mci\n");
+
+	mci->pdev = &pdev->dev;
+	mci->mtype_cap = MEM_FLAG_DDR2;
+
+	mci->edac_ctl_cap = EDAC_FLAG_SECDED;
+	mci->edac_cap = EDAC_FLAG_SECDED;
+
+	mci->mod_name = EDAC_MOD_STR;
+	mci->mod_ver = I3200_REVISION;
+	mci->ctl_name = i3200_devs[dev_idx].ctl_name;
+	mci->dev_name = pci_name(pdev);
+	mci->edac_check = i3200_check;
+	mci->ctl_page_to_phys = NULL;
+	priv = mci->pvt_info;
+	priv->window = window;
+
+	stacked = i3200_is_stacked(pdev, drbs);
+
+	/*
+	 * 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 < I3200_DIMMS; i++) {
+		unsigned long nr_pages;
+
+		for (j = 0; j < nr_channels; j++) {
+			struct dimm_info *dimm = EDAC_DIMM_PTR(mci->layers, mci->dimms,
+							       mci->n_layers, i, j, 0);
+
+			nr_pages = drb_to_nr_pages(drbs, stacked, j, i);
+			if (nr_pages == 0)
+				continue;
+
+			edac_dbg(0, "csrow %d, channel %d%s, size = %ld Mb\n", i, j,
+				 stacked ? " (stacked)" : "", PAGES_TO_MiB(nr_pages));
+
+			dimm->nr_pages = nr_pages;
+			dimm->grain = nr_pages << PAGE_SHIFT;
+			dimm->mtype = MEM_DDR2;
+			dimm->dtype = DEV_UNKNOWN;
+			dimm->edac_mode = EDAC_UNKNOWN;
+		}
+	}
+
+	i3200_clear_error_info(mci);
+
+	rc = -ENODEV;
+	if (edac_mc_add_mc(mci)) {
+		edac_dbg(3, "MC: failed edac_mc_add_mc()\n");
+		goto fail;
+	}
+
+	/* get this far and it's successful */
+	edac_dbg(3, "MC: success\n");
+	return 0;
+
+fail:
+	iounmap(window);
+	if (mci)
+		edac_mc_free(mci);
+
+	return rc;
+}
+
+static int i3200_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
+{
+	int rc;
+
+	edac_dbg(0, "MC:\n");
+
+	if (pci_enable_device(pdev) < 0)
+		return -EIO;
+
+	rc = i3200_probe1(pdev, ent->driver_data);
+	if (!mci_pdev)
+		mci_pdev = pci_dev_get(pdev);
+
+	return rc;
+}
+
+static void i3200_remove_one(struct pci_dev *pdev)
+{
+	struct mem_ctl_info *mci;
+	struct i3200_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);
+
+	pci_disable_device(pdev);
+}
+
+static const struct pci_device_id i3200_pci_tbl[] = {
+	{
+		PCI_VEND_DEV(INTEL, 3200_HB), PCI_ANY_ID, PCI_ANY_ID, 0, 0,
+		I3200},
+	{
+		0,
+	}            /* 0 terminated list. */
+};
+
+MODULE_DEVICE_TABLE(pci, i3200_pci_tbl);
+
+static struct pci_driver i3200_driver = {
+	.name = EDAC_MOD_STR,
+	.probe = i3200_init_one,
+	.remove = i3200_remove_one,
+	.id_table = i3200_pci_tbl,
+};
+
+static int __init i3200_init(void)
+{
+	int pci_rc;
+
+	edac_dbg(3, "MC:\n");
+
+	/* Ensure that the OPSTATE is set correctly for POLL or NMI */
+	opstate_init();
+
+	pci_rc = pci_register_driver(&i3200_driver);
+	if (pci_rc < 0)
+		goto fail0;
+
+	if (!mci_pdev) {
+		i3200_registered = 0;
+		mci_pdev = pci_get_device(PCI_VENDOR_ID_INTEL,
+				PCI_DEVICE_ID_INTEL_3200_HB, NULL);
+		if (!mci_pdev) {
+			edac_dbg(0, "i3200 pci_get_device fail\n");
+			pci_rc = -ENODEV;
+			goto fail1;
+		}
+
+		pci_rc = i3200_init_one(mci_pdev, i3200_pci_tbl);
+		if (pci_rc < 0) {
+			edac_dbg(0, "i3200 init fail\n");
+			pci_rc = -ENODEV;
+			goto fail1;
+		}
+	}
+
+	return 0;
+
+fail1:
+	pci_unregister_driver(&i3200_driver);
+
+fail0:
+	pci_dev_put(mci_pdev);
+
+	return pci_rc;
+}
+
+static void __exit i3200_exit(void)
+{
+	edac_dbg(3, "MC:\n");
+
+	pci_unregister_driver(&i3200_driver);
+	if (!i3200_registered) {
+		i3200_remove_one(mci_pdev);
+		pci_dev_put(mci_pdev);
+	}
+}
+
+module_init(i3200_init);
+module_exit(i3200_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Akamai Technologies, Inc.");
+MODULE_DESCRIPTION("MC support for Intel 3200 memory hub controllers");
+
+module_param(edac_op_state, int, 0444);
+MODULE_PARM_DESC(edac_op_state, "EDAC Error Reporting state: 0=Poll,1=NMI");