/* * 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_UNCORRECTED, mci, 1, 0, 0, eccerrlog_syndrome(log), eccerrlog_row(channel, log), -1, -1, "i3000 UE", ""); } } } 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); } 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); } static DEFINE_PCI_DEVICE_TABLE(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: if (mci_pdev) 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");