drivers/edac/i82875p_edac.c

   1 /*
   2  * Intel D82875P Memory Controller kernel module
   3  * (C) 2003 Linux Networx (http://lnxi.com)
   4  * This file may be distributed under the terms of the
   5  * GNU General Public License.
   6  *
   7  * Written by Thayne Harbaugh
   8  * Contributors:
   9  *      Wang Zhenyu at intel.com
  10  *
  11  * $Id: edac_i82875p.c,v 1.5.2.11 2005/10/05 00:43:44 dsp_llnl Exp $
  12  *
  13  * Note: E7210 appears same as D82875P - zhenyu.z.wang at intel.com
  14  */
  15
  16 #include <linux/module.h>
  17 #include <linux/init.h>
  18 #include <linux/pci.h>
  19 #include <linux/pci_ids.h>
  20 #include <linux/edac.h>
  21 #include "edac_core.h"
  22
  23 #define I82875P_REVISION        " Ver: 2.0.2"
  24 #define EDAC_MOD_STR            "i82875p_edac"
  25
  26 #define i82875p_printk(level, fmt, arg...) \
  27         edac_printk(level, "i82875p", fmt, ##arg)
  28
  29 #define i82875p_mc_printk(mci, level, fmt, arg...) \
  30         edac_mc_chipset_printk(mci, level, "i82875p", fmt, ##arg)
  31
  32 #ifndef PCI_DEVICE_ID_INTEL_82875_0
  33 #define PCI_DEVICE_ID_INTEL_82875_0     0x2578
  34 #endif                          /* PCI_DEVICE_ID_INTEL_82875_0 */
  35
  36 #ifndef PCI_DEVICE_ID_INTEL_82875_6
  37 #define PCI_DEVICE_ID_INTEL_82875_6     0x257e
  38 #endif                          /* PCI_DEVICE_ID_INTEL_82875_6 */
  39
  40 /* four csrows in dual channel, eight in single channel */
  41 #define I82875P_NR_DIMMS                8
  42 #define I82875P_NR_CSROWS(nr_chans)     (I82875P_NR_DIMMS / (nr_chans))
  43
  44 /* Intel 82875p register addresses - device 0 function 0 - DRAM Controller */
  45 #define I82875P_EAP             0x58    /* Error Address Pointer (32b)
  46                                          *
  47                                          * 31:12 block address
  48                                          * 11:0  reserved
  49                                          */
  50
  51 #define I82875P_DERRSYN         0x5c    /* DRAM Error Syndrome (8b)
  52                                          *
  53                                          *  7:0  DRAM ECC Syndrome
  54                                          */
  55
  56 #define I82875P_DES             0x5d    /* DRAM Error Status (8b)
  57                                          *
  58                                          *  7:1  reserved
  59                                          *  0    Error channel 0/1
  60                                          */
  61
  62 #define I82875P_ERRSTS          0xc8    /* Error Status Register (16b)
  63                                          *
  64                                          * 15:10 reserved
  65                                          *  9    non-DRAM lock error (ndlock)
  66                                          *  8    Sftwr Generated SMI
  67                                          *  7    ECC UE
  68                                          *  6    reserved
  69                                          *  5    MCH detects unimplemented cycle
  70                                          *  4    AGP access outside GA
  71                                          *  3    Invalid AGP access
  72                                          *  2    Invalid GA translation table
  73                                          *  1    Unsupported AGP command
  74                                          *  0    ECC CE
  75                                          */
  76
  77 #define I82875P_ERRCMD          0xca    /* Error Command (16b)
  78                                          *
  79                                          * 15:10 reserved
  80                                          *  9    SERR on non-DRAM lock
  81                                          *  8    SERR on ECC UE
  82                                          *  7    SERR on ECC CE
  83                                          *  6    target abort on high exception
  84                                          *  5    detect unimplemented cyc
  85                                          *  4    AGP access outside of GA
  86                                          *  3    SERR on invalid AGP access
  87                                          *  2    invalid translation table
  88                                          *  1    SERR on unsupported AGP command
  89                                          *  0    reserved
  90                                          */
  91
  92 /* Intel 82875p register addresses - device 6 function 0 - DRAM Controller */
  93 #define I82875P_PCICMD6         0x04    /* PCI Command Register (16b)
  94                                          *
  95                                          * 15:10 reserved
  96                                          *  9    fast back-to-back - ro 0
  97                                          *  8    SERR enable - ro 0
  98                                          *  7    addr/data stepping - ro 0
  99                                          *  6    parity err enable - ro 0
 100                                          *  5    VGA palette snoop - ro 0
 101                                          *  4    mem wr & invalidate - ro 0
 102                                          *  3    special cycle - ro 0
 103                                          *  2    bus master - ro 0
 104                                          *  1    mem access dev6 - 0(dis),1(en)
 105                                          *  0    IO access dev3 - 0(dis),1(en)
 106                                          */
 107
 108 #define I82875P_BAR6            0x10    /* Mem Delays Base ADDR Reg (32b)
 109                                          *
 110                                          * 31:12 mem base addr [31:12]
 111                                          * 11:4  address mask - ro 0
 112                                          *  3    prefetchable - ro 0(non),1(pre)
 113                                          *  2:1  mem type - ro 0
 114                                          *  0    mem space - ro 0
 115                                          */
 116
 117 /* Intel 82875p MMIO register space - device 0 function 0 - MMR space */
 118
 119 #define I82875P_DRB_SHIFT 26    /* 64MiB grain */
 120 #define I82875P_DRB             0x00    /* DRAM Row Boundary (8b x 8)
 121                                          *
 122                                          *  7    reserved
 123                                          *  6:0  64MiB row boundary addr
 124                                          */
 125
 126 #define I82875P_DRA             0x10    /* DRAM Row Attribute (4b x 8)
 127                                          *
 128                                          *  7    reserved
 129                                          *  6:4  row attr row 1
 130                                          *  3    reserved
 131                                          *  2:0  row attr row 0
 132                                          *
 133                                          * 000 =  4KiB
 134                                          * 001 =  8KiB
 135                                          * 010 = 16KiB
 136                                          * 011 = 32KiB
 137                                          */
 138
 139 #define I82875P_DRC             0x68    /* DRAM Controller Mode (32b)
 140                                          *
 141                                          * 31:30 reserved
 142                                          * 29    init complete
 143                                          * 28:23 reserved
 144                                          * 22:21 nr chan 00=1,01=2
 145                                          * 20    reserved
 146                                          * 19:18 Data Integ Mode 00=none,01=ecc
 147                                          * 17:11 reserved
 148                                          * 10:8  refresh mode
 149                                          *  7    reserved
 150                                          *  6:4  mode select
 151                                          *  3:2  reserved
 152                                          *  1:0  DRAM type 01=DDR
 153                                          */
 154
 155 enum i82875p_chips {
 156         I82875P = 0,
 157 };
 158
 159 struct i82875p_pvt {
 160         struct pci_dev *ovrfl_pdev;
 161         void __iomem *ovrfl_window;
 162 };
 163
 164 struct i82875p_dev_info {
 165         const char *ctl_name;
 166 };
 167
 168 struct i82875p_error_info {
 169         u16 errsts;
 170         u32 eap;
 171         u8 des;
 172         u8 derrsyn;
 173         u16 errsts2;
 174 };
 175
 176 static const struct i82875p_dev_info i82875p_devs[] = {
 177         [I82875P] = {
 178                 .ctl_name = "i82875p"},
 179 };
 180
 181 static struct pci_dev *mci_pdev;        /* init dev: in case that AGP code has
 182                                          * already registered driver
 183                                          */
 184
 185 static struct edac_pci_ctl_info *i82875p_pci;
 186
 187 static void i82875p_get_error_info(struct mem_ctl_info *mci,
 188                                 struct i82875p_error_info *info)
 189 {
 190         struct pci_dev *pdev;
 191
 192         pdev = to_pci_dev(mci->pdev);
 193
 194         /*
 195          * This is a mess because there is no atomic way to read all the
 196          * registers at once and the registers can transition from CE being
 197          * overwritten by UE.
 198          */
 199         pci_read_config_word(pdev, I82875P_ERRSTS, &info->errsts);
 200
 201         if (!(info->errsts & 0x0081))
 202                 return;
 203
 204         pci_read_config_dword(pdev, I82875P_EAP, &info->eap);
 205         pci_read_config_byte(pdev, I82875P_DES, &info->des);
 206         pci_read_config_byte(pdev, I82875P_DERRSYN, &info->derrsyn);
 207         pci_read_config_word(pdev, I82875P_ERRSTS, &info->errsts2);
 208
 209         /*
 210          * If the error is the same then we can for both reads then
 211          * the first set of reads is valid.  If there is a change then
 212          * there is a CE no info and the second set of reads is valid
 213          * and should be UE info.
 214          */
 215         if ((info->errsts ^ info->errsts2) & 0x0081) {
 216                 pci_read_config_dword(pdev, I82875P_EAP, &info->eap);
 217                 pci_read_config_byte(pdev, I82875P_DES, &info->des);
 218                 pci_read_config_byte(pdev, I82875P_DERRSYN, &info->derrsyn);
 219         }
 220
 221         pci_write_bits16(pdev, I82875P_ERRSTS, 0x0081, 0x0081);
 222 }
 223
 224 static int i82875p_process_error_info(struct mem_ctl_info *mci,
 225                                 struct i82875p_error_info *info,
 226                                 int handle_errors)
 227 {
 228         int row, multi_chan;
 229
 230         multi_chan = mci->csrows[0]->nr_channels - 1;
 231
 232         if (!(info->errsts & 0x0081))
 233                 return 0;
 234
 235         if (!handle_errors)
 236                 return 1;
 237
 238         if ((info->errsts ^ info->errsts2) & 0x0081) {
 239                 edac_mc_handle_error(HW_EVENT_ERR_UNCORRECTED, mci, 1, 0, 0, 0,
 240                                      -1, -1, -1,
 241                                      "UE overwrote CE", "");
 242                 info->errsts = info->errsts2;
 243         }
 244
 245         info->eap >>= PAGE_SHIFT;
 246         row = edac_mc_find_csrow_by_page(mci, info->eap);
 247
 248         if (info->errsts & 0x0080)
 249                 edac_mc_handle_error(HW_EVENT_ERR_UNCORRECTED, mci, 1,
 250                                      info->eap, 0, 0,
 251                                      row, -1, -1,
 252                                      "i82875p UE", "");
 253         else
 254                 edac_mc_handle_error(HW_EVENT_ERR_CORRECTED, mci, 1,
 255                                      info->eap, 0, info->derrsyn,
 256                                      row, multi_chan ? (info->des & 0x1) : 0,
 257                                      -1, "i82875p CE", "");
 258
 259         return 1;
 260 }
 261
 262 static void i82875p_check(struct mem_ctl_info *mci)
 263 {
 264         struct i82875p_error_info info;
 265
 266         edac_dbg(1, "MC%d\n", mci->mc_idx);
 267         i82875p_get_error_info(mci, &info);
 268         i82875p_process_error_info(mci, &info, 1);
 269 }
 270
 271 /* Return 0 on success or 1 on failure. */
 272 static int i82875p_setup_overfl_dev(struct pci_dev *pdev,
 273                                 struct pci_dev **ovrfl_pdev,
 274                                 void __iomem **ovrfl_window)
 275 {
 276         struct pci_dev *dev;
 277         void __iomem *window;
 278
 279         *ovrfl_pdev = NULL;
 280         *ovrfl_window = NULL;
 281         dev = pci_get_device(PCI_VEND_DEV(INTEL, 82875_6), NULL);
 282
 283         if (dev == NULL) {
 284                 /* Intel tells BIOS developers to hide device 6 which
 285                  * configures the overflow device access containing
 286                  * the DRBs - this is where we expose device 6.
 287                  * http://www.x86-secret.com/articles/tweak/pat/patsecrets-2.htm
 288                  */
 289                 pci_write_bits8(pdev, 0xf4, 0x2, 0x2);
 290                 dev = pci_scan_single_device(pdev->bus, PCI_DEVFN(6, 0));
 291
 292                 if (dev == NULL)
 293                         return 1;
 294
 295                 pci_bus_assign_resources(dev->bus);
 296                 pci_bus_add_device(dev);
 297         }
 298
 299         *ovrfl_pdev = dev;
 300
 301         if (pci_enable_device(dev)) {
 302                 i82875p_printk(KERN_ERR, "%s(): Failed to enable overflow "
 303                         "device\n", __func__);
 304                 return 1;
 305         }
 306
 307         if (pci_request_regions(dev, pci_name(dev))) {
 308 #ifdef CORRECT_BIOS
 309                 goto fail0;
 310 #endif
 311         }
 312
 313         /* cache is irrelevant for PCI bus reads/writes */
 314         window = pci_ioremap_bar(dev, 0);
 315         if (window == NULL) {
 316                 i82875p_printk(KERN_ERR, "%s(): Failed to ioremap bar6\n",
 317                         __func__);
 318                 goto fail1;
 319         }
 320
 321         *ovrfl_window = window;
 322         return 0;
 323
 324 fail1:
 325         pci_release_regions(dev);
 326
 327 #ifdef CORRECT_BIOS
 328 fail0:
 329         pci_disable_device(dev);
 330 #endif
 331         /* NOTE: the ovrfl proc entry and pci_dev are intentionally left */
 332         return 1;
 333 }
 334
 335 /* Return 1 if dual channel mode is active.  Else return 0. */
 336 static inline int dual_channel_active(u32 drc)
 337 {
 338         return (drc >> 21) & 0x1;
 339 }
 340
 341 static void i82875p_init_csrows(struct mem_ctl_info *mci,
 342                                 struct pci_dev *pdev,
 343                                 void __iomem * ovrfl_window, u32 drc)
 344 {
 345         struct csrow_info *csrow;
 346         struct dimm_info *dimm;
 347         unsigned nr_chans = dual_channel_active(drc) + 1;
 348         unsigned long last_cumul_size;
 349         u8 value;
 350         u32 drc_ddim;           /* DRAM Data Integrity Mode 0=none,2=edac */
 351         u32 cumul_size, nr_pages;
 352         int index, j;
 353
 354         drc_ddim = (drc >> 18) & 0x1;
 355         last_cumul_size = 0;
 356
 357         /* The dram row boundary (DRB) reg values are boundary address
 358          * for each DRAM row with a granularity of 32 or 64MB (single/dual
 359          * channel operation).  DRB regs are cumulative; therefore DRB7 will
 360          * contain the total memory contained in all eight rows.
 361          */
 362
 363         for (index = 0; index < mci->nr_csrows; index++) {
 364                 csrow = mci->csrows[index];
 365
 366                 value = readb(ovrfl_window + I82875P_DRB + index);
 367                 cumul_size = value << (I82875P_DRB_SHIFT - PAGE_SHIFT);
 368                 edac_dbg(3, "(%d) cumul_size 0x%x\n", index, cumul_size);
 369                 if (cumul_size == last_cumul_size)
 370                         continue;       /* not populated */
 371
 372                 csrow->first_page = last_cumul_size;
 373                 csrow->last_page = cumul_size - 1;
 374                 nr_pages = cumul_size - last_cumul_size;
 375                 last_cumul_size = cumul_size;
 376
 377                 for (j = 0; j < nr_chans; j++) {
 378                         dimm = csrow->channels[j]->dimm;
 379
 380                         dimm->nr_pages = nr_pages / nr_chans;
 381                         dimm->grain = 1 << 12;  /* I82875P_EAP has 4KiB reolution */
 382                         dimm->mtype = MEM_DDR;
 383                         dimm->dtype = DEV_UNKNOWN;
 384                         dimm->edac_mode = drc_ddim ? EDAC_SECDED : EDAC_NONE;
 385                 }
 386         }
 387 }
 388
 389 static int i82875p_probe1(struct pci_dev *pdev, int dev_idx)
 390 {
 391         int rc = -ENODEV;
 392         struct mem_ctl_info *mci;
 393         struct edac_mc_layer layers[2];
 394         struct i82875p_pvt *pvt;
 395         struct pci_dev *ovrfl_pdev;
 396         void __iomem *ovrfl_window;
 397         u32 drc;
 398         u32 nr_chans;
 399         struct i82875p_error_info discard;
 400
 401         edac_dbg(0, "\n");
 402
 403         if (i82875p_setup_overfl_dev(pdev, &ovrfl_pdev, &ovrfl_window))
 404                 return -ENODEV;
 405         drc = readl(ovrfl_window + I82875P_DRC);
 406         nr_chans = dual_channel_active(drc) + 1;
 407
 408         layers[0].type = EDAC_MC_LAYER_CHIP_SELECT;
 409         layers[0].size = I82875P_NR_CSROWS(nr_chans);
 410         layers[0].is_virt_csrow = true;
 411         layers[1].type = EDAC_MC_LAYER_CHANNEL;
 412         layers[1].size = nr_chans;
 413         layers[1].is_virt_csrow = false;
 414         mci = edac_mc_alloc(0, ARRAY_SIZE(layers), layers, sizeof(*pvt));
 415         if (!mci) {
 416                 rc = -ENOMEM;
 417                 goto fail0;
 418         }
 419
 420         edac_dbg(3, "init mci\n");
 421         mci->pdev = &pdev->dev;
 422         mci->mtype_cap = MEM_FLAG_DDR;
 423         mci->edac_ctl_cap = EDAC_FLAG_NONE | EDAC_FLAG_SECDED;
 424         mci->edac_cap = EDAC_FLAG_UNKNOWN;
 425         mci->mod_name = EDAC_MOD_STR;
 426         mci->mod_ver = I82875P_REVISION;
 427         mci->ctl_name = i82875p_devs[dev_idx].ctl_name;
 428         mci->dev_name = pci_name(pdev);
 429         mci->edac_check = i82875p_check;
 430         mci->ctl_page_to_phys = NULL;
 431         edac_dbg(3, "init pvt\n");
 432         pvt = (struct i82875p_pvt *)mci->pvt_info;
 433         pvt->ovrfl_pdev = ovrfl_pdev;
 434         pvt->ovrfl_window = ovrfl_window;
 435         i82875p_init_csrows(mci, pdev, ovrfl_window, drc);
 436         i82875p_get_error_info(mci, &discard);  /* clear counters */
 437
 438         /* Here we assume that we will never see multiple instances of this
 439          * type of memory controller.  The ID is therefore hardcoded to 0.
 440          */
 441         if (edac_mc_add_mc(mci)) {
 442                 edac_dbg(3, "failed edac_mc_add_mc()\n");
 443                 goto fail1;
 444         }
 445
 446         /* allocating generic PCI control info */
 447         i82875p_pci = edac_pci_create_generic_ctl(&pdev->dev, EDAC_MOD_STR);
 448         if (!i82875p_pci) {
 449                 printk(KERN_WARNING
 450                         "%s(): Unable to create PCI control\n",
 451                         __func__);
 452                 printk(KERN_WARNING
 453                         "%s(): PCI error report via EDAC not setup\n",
 454                         __func__);
 455         }
 456
 457         /* get this far and it's successful */
 458         edac_dbg(3, "success\n");
 459         return 0;
 460
 461 fail1:
 462         edac_mc_free(mci);
 463
 464 fail0:
 465         iounmap(ovrfl_window);
 466         pci_release_regions(ovrfl_pdev);
 467
 468         pci_disable_device(ovrfl_pdev);
 469         /* NOTE: the ovrfl proc entry and pci_dev are intentionally left */
 470         return rc;
 471 }
 472
 473 /* returns count (>= 0), or negative on error */
 474 static int i82875p_init_one(struct pci_dev *pdev,
 475                             const struct pci_device_id *ent)
 476 {
 477         int rc;
 478
 479         edac_dbg(0, "\n");
 480         i82875p_printk(KERN_INFO, "i82875p init one\n");
 481
 482         if (pci_enable_device(pdev) < 0)
 483                 return -EIO;
 484
 485         rc = i82875p_probe1(pdev, ent->driver_data);
 486
 487         if (mci_pdev == NULL)
 488                 mci_pdev = pci_dev_get(pdev);
 489
 490         return rc;
 491 }
 492
 493 static void i82875p_remove_one(struct pci_dev *pdev)
 494 {
 495         struct mem_ctl_info *mci;
 496         struct i82875p_pvt *pvt = NULL;
 497
 498         edac_dbg(0, "\n");
 499
 500         if (i82875p_pci)
 501                 edac_pci_release_generic_ctl(i82875p_pci);
 502
 503         if ((mci = edac_mc_del_mc(&pdev->dev)) == NULL)
 504                 return;
 505
 506         pvt = (struct i82875p_pvt *)mci->pvt_info;
 507
 508         if (pvt->ovrfl_window)
 509                 iounmap(pvt->ovrfl_window);
 510
 511         if (pvt->ovrfl_pdev) {
 512 #ifdef CORRECT_BIOS
 513                 pci_release_regions(pvt->ovrfl_pdev);
 514 #endif                          /*CORRECT_BIOS */
 515                 pci_disable_device(pvt->ovrfl_pdev);
 516                 pci_dev_put(pvt->ovrfl_pdev);
 517         }
 518
 519         edac_mc_free(mci);
 520 }
 521
 522 static const struct pci_device_id i82875p_pci_tbl[] = {
 523         {
 524          PCI_VEND_DEV(INTEL, 82875_0), PCI_ANY_ID, PCI_ANY_ID, 0, 0,
 525          I82875P},
 526         {
 527          0,
 528          }                      /* 0 terminated list. */
 529 };
 530
 531 MODULE_DEVICE_TABLE(pci, i82875p_pci_tbl);
 532
 533 static struct pci_driver i82875p_driver = {
 534         .name = EDAC_MOD_STR,
 535         .probe = i82875p_init_one,
 536         .remove = i82875p_remove_one,
 537         .id_table = i82875p_pci_tbl,
 538 };
 539
 540 static int __init i82875p_init(void)
 541 {
 542         int pci_rc;
 543
 544         edac_dbg(3, "\n");
 545
 546        /* Ensure that the OPSTATE is set correctly for POLL or NMI */
 547        opstate_init();
 548
 549         pci_rc = pci_register_driver(&i82875p_driver);
 550
 551         if (pci_rc < 0)
 552                 goto fail0;
 553
 554         if (mci_pdev == NULL) {
 555                 mci_pdev = pci_get_device(PCI_VENDOR_ID_INTEL,
 556                                         PCI_DEVICE_ID_INTEL_82875_0, NULL);
 557
 558                 if (!mci_pdev) {
 559                         edac_dbg(0, "875p pci_get_device fail\n");
 560                         pci_rc = -ENODEV;
 561                         goto fail1;
 562                 }
 563
 564                 pci_rc = i82875p_init_one(mci_pdev, i82875p_pci_tbl);
 565
 566                 if (pci_rc < 0) {
 567                         edac_dbg(0, "875p init fail\n");
 568                         pci_rc = -ENODEV;
 569                         goto fail1;
 570                 }
 571         }
 572
 573         return 0;
 574
 575 fail1:
 576         pci_unregister_driver(&i82875p_driver);
 577
 578 fail0:
 579         if (mci_pdev != NULL)
 580                 pci_dev_put(mci_pdev);
 581
 582         return pci_rc;
 583 }
 584
 585 static void __exit i82875p_exit(void)
 586 {
 587         edac_dbg(3, "\n");
 588
 589         i82875p_remove_one(mci_pdev);
 590         pci_dev_put(mci_pdev);
 591
 592         pci_unregister_driver(&i82875p_driver);
 593
 594 }
 595
 596 module_init(i82875p_init);
 597 module_exit(i82875p_exit);
 598
 599 MODULE_LICENSE("GPL");
 600 MODULE_AUTHOR("Linux Networx (http://lnxi.com) Thayne Harbaugh");
 601 MODULE_DESCRIPTION("MC support for Intel 82875 memory hub controllers");
 602
 603 module_param(edac_op_state, int, 0444);
 604 MODULE_PARM_DESC(edac_op_state, "EDAC Error Reporting state: 0=Poll,1=NMI");