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   1 /*
   2  * edac_mc kernel module
   3  * (C) 2005 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  * Based on work by Dan Hollis <goemon at anime dot net> and others.
   9  *      http://www.anime.net/~goemon/linux-ecc/
  10  *
  11  * Modified by Dave Peterson and Doug Thompson
  12  *
  13  */
  14
  15
  16 #include <linux/config.h>
  17 #include <linux/module.h>
  18 #include <linux/proc_fs.h>
  19 #include <linux/kernel.h>
  20 #include <linux/types.h>
  21 #include <linux/smp.h>
  22 #include <linux/init.h>
  23 #include <linux/sysctl.h>
  24 #include <linux/highmem.h>
  25 #include <linux/timer.h>
  26 #include <linux/slab.h>
  27 #include <linux/jiffies.h>
  28 #include <linux/spinlock.h>
  29 #include <linux/list.h>
  30 #include <linux/sysdev.h>
  31 #include <linux/ctype.h>
  32
  33 #include <asm/uaccess.h>
  34 #include <asm/page.h>
  35 #include <asm/edac.h>
  36
  37 #include "edac_mc.h"
  38
  39 #define EDAC_MC_VERSION "edac_mc  Ver: 2.0.0 " __DATE__
  40
  41 /* For now, disable the EDAC sysfs code.  The sysfs interface that EDAC
  42  * presents to user space needs more thought, and is likely to change
  43  * substantially.
  44  */
  45 #define DISABLE_EDAC_SYSFS
  46
  47 #ifdef CONFIG_EDAC_DEBUG
  48 /* Values of 0 to 4 will generate output */
  49 int edac_debug_level = 1;
  50 EXPORT_SYMBOL(edac_debug_level);
  51 #endif
  52
  53 /* EDAC Controls, setable by module parameter, and sysfs */
  54 static int log_ue = 1;
  55 static int log_ce = 1;
  56 static int panic_on_ue;
  57 static int poll_msec = 1000;
  58
  59 static int check_pci_parity = 0;        /* default YES check PCI parity */
  60 static int panic_on_pci_parity;         /* default no panic on PCI Parity */
  61 static atomic_t pci_parity_count = ATOMIC_INIT(0);
  62
  63 /* lock to memory controller's control array */
  64 static DECLARE_MUTEX(mem_ctls_mutex);
  65 static struct list_head mc_devices = LIST_HEAD_INIT(mc_devices);
  66
  67 /* Structure of the whitelist and blacklist arrays */
  68 struct edac_pci_device_list {
  69         unsigned int  vendor;           /* Vendor ID */
  70         unsigned int  device;           /* Deviice ID */
  71 };
  72
  73
  74 #define MAX_LISTED_PCI_DEVICES          32
  75
  76 /* List of PCI devices (vendor-id:device-id) that should be skipped */
  77 static struct edac_pci_device_list pci_blacklist[MAX_LISTED_PCI_DEVICES];
  78 static int pci_blacklist_count;
  79
  80 /* List of PCI devices (vendor-id:device-id) that should be scanned */
  81 static struct edac_pci_device_list pci_whitelist[MAX_LISTED_PCI_DEVICES];
  82 static int pci_whitelist_count ;
  83
  84 /*  START sysfs data and methods */
  85
  86 #ifndef DISABLE_EDAC_SYSFS
  87
  88 static const char *mem_types[] = {
  89         [MEM_EMPTY] = "Empty",
  90         [MEM_RESERVED] = "Reserved",
  91         [MEM_UNKNOWN] = "Unknown",
  92         [MEM_FPM] = "FPM",
  93         [MEM_EDO] = "EDO",
  94         [MEM_BEDO] = "BEDO",
  95         [MEM_SDR] = "Unbuffered-SDR",
  96         [MEM_RDR] = "Registered-SDR",
  97         [MEM_DDR] = "Unbuffered-DDR",
  98         [MEM_RDDR] = "Registered-DDR",
  99         [MEM_RMBS] = "RMBS"
 100 };
 101
 102 static const char *dev_types[] = {
 103         [DEV_UNKNOWN] = "Unknown",
 104         [DEV_X1] = "x1",
 105         [DEV_X2] = "x2",
 106         [DEV_X4] = "x4",
 107         [DEV_X8] = "x8",
 108         [DEV_X16] = "x16",
 109         [DEV_X32] = "x32",
 110         [DEV_X64] = "x64"
 111 };
 112
 113 static const char *edac_caps[] = {
 114         [EDAC_UNKNOWN] = "Unknown",
 115         [EDAC_NONE] = "None",
 116         [EDAC_RESERVED] = "Reserved",
 117         [EDAC_PARITY] = "PARITY",
 118         [EDAC_EC] = "EC",
 119         [EDAC_SECDED] = "SECDED",
 120         [EDAC_S2ECD2ED] = "S2ECD2ED",
 121         [EDAC_S4ECD4ED] = "S4ECD4ED",
 122         [EDAC_S8ECD8ED] = "S8ECD8ED",
 123         [EDAC_S16ECD16ED] = "S16ECD16ED"
 124 };
 125
 126
 127 /* sysfs object: /sys/devices/system/edac */
 128 static struct sysdev_class edac_class = {
 129         set_kset_name("edac"),
 130 };
 131
 132 /* sysfs objects:
 133  *      /sys/devices/system/edac/mc
 134  *      /sys/devices/system/edac/pci
 135  */
 136 static struct kobject edac_memctrl_kobj;
 137 static struct kobject edac_pci_kobj;
 138
 139 /*
 140  * /sys/devices/system/edac/mc;
 141  *      data structures and methods
 142  */
 143 #if 0
 144 static ssize_t memctrl_string_show(void *ptr, char *buffer)
 145 {
 146         char *value = (char*) ptr;
 147         return sprintf(buffer, "%s\n", value);
 148 }
 149 #endif
 150
 151 static ssize_t memctrl_int_show(void *ptr, char *buffer)
 152 {
 153         int *value = (int*) ptr;
 154         return sprintf(buffer, "%d\n", *value);
 155 }
 156
 157 static ssize_t memctrl_int_store(void *ptr, const char *buffer, size_t count)
 158 {
 159         int *value = (int*) ptr;
 160
 161         if (isdigit(*buffer))
 162                 *value = simple_strtoul(buffer, NULL, 0);
 163
 164         return count;
 165 }
 166
 167 struct memctrl_dev_attribute {
 168         struct attribute        attr;
 169         void    *value;
 170         ssize_t (*show)(void *,char *);
 171         ssize_t (*store)(void *, const char *, size_t);
 172 };
 173
 174 /* Set of show/store abstract level functions for memory control object */
 175 static ssize_t
 176 memctrl_dev_show(struct kobject *kobj, struct attribute *attr, char *buffer)
 177 {
 178         struct memctrl_dev_attribute *memctrl_dev;
 179         memctrl_dev = (struct memctrl_dev_attribute*)attr;
 180
 181         if (memctrl_dev->show)
 182                 return memctrl_dev->show(memctrl_dev->value, buffer);
 183         return -EIO;
 184 }
 185
 186 static ssize_t
 187 memctrl_dev_store(struct kobject *kobj, struct attribute *attr,
 188                         const char *buffer, size_t count)
 189 {
 190         struct memctrl_dev_attribute *memctrl_dev;
 191         memctrl_dev = (struct memctrl_dev_attribute*)attr;
 192
 193         if (memctrl_dev->store)
 194                 return memctrl_dev->store(memctrl_dev->value, buffer, count);
 195         return -EIO;
 196 }
 197
 198 static struct sysfs_ops memctrlfs_ops = {
 199         .show   = memctrl_dev_show,
 200         .store  = memctrl_dev_store
 201 };
 202
 203 #define MEMCTRL_ATTR(_name,_mode,_show,_store)                  \
 204 struct memctrl_dev_attribute attr_##_name = {                   \
 205         .attr = {.name = __stringify(_name), .mode = _mode },   \
 206         .value  = &_name,                                       \
 207         .show   = _show,                                        \
 208         .store  = _store,                                       \
 209 };
 210
 211 #define MEMCTRL_STRING_ATTR(_name,_data,_mode,_show,_store)     \
 212 struct memctrl_dev_attribute attr_##_name = {                   \
 213         .attr = {.name = __stringify(_name), .mode = _mode },   \
 214         .value  = _data,                                        \
 215         .show   = _show,                                        \
 216         .store  = _store,                                       \
 217 };
 218
 219 /* cwrow<id> attribute f*/
 220 #if 0
 221 MEMCTRL_STRING_ATTR(mc_version,EDAC_MC_VERSION,S_IRUGO,memctrl_string_show,NULL);
 222 #endif
 223
 224 /* csrow<id> control files */
 225 MEMCTRL_ATTR(panic_on_ue,S_IRUGO|S_IWUSR,memctrl_int_show,memctrl_int_store);
 226 MEMCTRL_ATTR(log_ue,S_IRUGO|S_IWUSR,memctrl_int_show,memctrl_int_store);
 227 MEMCTRL_ATTR(log_ce,S_IRUGO|S_IWUSR,memctrl_int_show,memctrl_int_store);
 228 MEMCTRL_ATTR(poll_msec,S_IRUGO|S_IWUSR,memctrl_int_show,memctrl_int_store);
 229
 230
 231 /* Base Attributes of the memory ECC object */
 232 static struct memctrl_dev_attribute *memctrl_attr[] = {
 233         &attr_panic_on_ue,
 234         &attr_log_ue,
 235         &attr_log_ce,
 236         &attr_poll_msec,
 237         NULL,
 238 };
 239
 240 /* Main MC kobject release() function */
 241 static void edac_memctrl_master_release(struct kobject *kobj)
 242 {
 243         debugf1("EDAC MC: " __FILE__ ": %s()\n", __func__);
 244 }
 245
 246 static struct kobj_type ktype_memctrl = {
 247         .release        = edac_memctrl_master_release,
 248         .sysfs_ops      = &memctrlfs_ops,
 249         .default_attrs  = (struct attribute **) memctrl_attr,
 250 };
 251
 252 #endif  /* DISABLE_EDAC_SYSFS */
 253
 254 /* Initialize the main sysfs entries for edac:
 255  *   /sys/devices/system/edac
 256  *
 257  * and children
 258  *
 259  * Return:  0 SUCCESS
 260  *         !0 FAILURE
 261  */
 262 static int edac_sysfs_memctrl_setup(void)
 263 #ifdef DISABLE_EDAC_SYSFS
 264 {
 265         return 0;
 266 }
 267 #else
 268 {
 269         int err=0;
 270
 271         debugf1("MC: " __FILE__ ": %s()\n", __func__);
 272
 273         /* create the /sys/devices/system/edac directory */
 274         err = sysdev_class_register(&edac_class);
 275         if (!err) {
 276                 /* Init the MC's kobject */
 277                 memset(&edac_memctrl_kobj, 0, sizeof (edac_memctrl_kobj));
 278                 kobject_init(&edac_memctrl_kobj);
 279
 280                 edac_memctrl_kobj.parent = &edac_class.kset.kobj;
 281                 edac_memctrl_kobj.ktype = &ktype_memctrl;
 282
 283                 /* generate sysfs "..../edac/mc"   */
 284                 err = kobject_set_name(&edac_memctrl_kobj,"mc");
 285                 if (!err) {
 286                         /* FIXME: maybe new sysdev_create_subdir() */
 287                         err = kobject_register(&edac_memctrl_kobj);
 288                         if (err) {
 289                                 debugf1("Failed to register '.../edac/mc'\n");
 290                         } else {
 291                                 debugf1("Registered '.../edac/mc' kobject\n");
 292                         }
 293                 }
 294         } else {
 295                 debugf1(KERN_WARNING "__FILE__ %s() error=%d\n", __func__,err);
 296         }
 297
 298         return err;
 299 }
 300 #endif  /* DISABLE_EDAC_SYSFS */
 301
 302 /*
 303  * MC teardown:
 304  *      the '..../edac/mc' kobject followed by '..../edac' itself
 305  */
 306 static void edac_sysfs_memctrl_teardown(void)
 307 {
 308 #ifndef DISABLE_EDAC_SYSFS
 309         debugf0("MC: " __FILE__ ": %s()\n", __func__);
 310
 311         /* Unregister the MC's kobject */
 312         kobject_unregister(&edac_memctrl_kobj);
 313
 314         /* release the master edac mc kobject */
 315         kobject_put(&edac_memctrl_kobj);
 316
 317         /* Unregister the 'edac' object */
 318         sysdev_class_unregister(&edac_class);
 319 #endif  /* DISABLE_EDAC_SYSFS */
 320 }
 321
 322 #ifndef DISABLE_EDAC_SYSFS
 323
 324 /*
 325  * /sys/devices/system/edac/pci;
 326  *      data structures and methods
 327  */
 328
 329 struct list_control {
 330         struct edac_pci_device_list *list;
 331         int *count;
 332 };
 333
 334
 335 #if 0
 336 /* Output the list as:  vendor_id:device:id<,vendor_id:device_id> */
 337 static ssize_t edac_pci_list_string_show(void *ptr, char *buffer)
 338 {
 339         struct list_control *listctl;
 340         struct edac_pci_device_list *list;
 341         char *p = buffer;
 342         int len=0;
 343         int i;
 344
 345         listctl = ptr;
 346         list = listctl->list;
 347
 348         for (i = 0; i < *(listctl->count); i++, list++ ) {
 349                 if (len > 0)
 350                         len += snprintf(p + len, (PAGE_SIZE-len), ",");
 351
 352                 len += snprintf(p + len,
 353                                 (PAGE_SIZE-len),
 354                                 "%x:%x",
 355                                 list->vendor,list->device);
 356         }
 357
 358         len += snprintf(p + len,(PAGE_SIZE-len), "\n");
 359
 360         return (ssize_t) len;
 361 }
 362
 363 /**
 364  *
 365  * Scan string from **s to **e looking for one 'vendor:device' tuple
 366  * where each field is a hex value
 367  *
 368  * return 0 if an entry is NOT found
 369  * return 1 if an entry is found
 370  *      fill in *vendor_id and *device_id with values found
 371  *
 372  * In both cases, make sure *s has been moved forward toward *e
 373  */
 374 static int parse_one_device(const char **s,const char **e,
 375         unsigned int *vendor_id, unsigned int *device_id)
 376 {
 377         const char *runner, *p;
 378
 379         /* if null byte, we are done */
 380         if (!**s) {
 381                 (*s)++; /* keep *s moving */
 382                 return 0;
 383         }
 384
 385         /* skip over newlines & whitespace */
 386         if ((**s == '\n') || isspace(**s)) {
 387                 (*s)++;
 388                 return 0;
 389         }
 390
 391         if (!isxdigit(**s)) {
 392                 (*s)++;
 393                 return 0;
 394         }
 395
 396         /* parse vendor_id */
 397         runner = *s;
 398         while (runner < *e) {
 399                 /* scan for vendor:device delimiter */
 400                 if (*runner == ':') {
 401                         *vendor_id = simple_strtol((char*) *s, (char**) &p, 16);
 402                         runner = p + 1;
 403                         break;
 404                 }
 405                 runner++;
 406         }
 407
 408         if (!isxdigit(*runner)) {
 409                 *s = ++runner;
 410                 return 0;
 411         }
 412
 413         /* parse device_id */
 414         if (runner < *e) {
 415                 *device_id = simple_strtol((char*)runner, (char**)&p, 16);
 416                 runner = p;
 417         }
 418
 419         *s = runner;
 420
 421         return 1;
 422 }
 423
 424 static ssize_t edac_pci_list_string_store(void *ptr, const char *buffer,
 425                                         size_t count)
 426 {
 427         struct list_control *listctl;
 428         struct edac_pci_device_list *list;
 429         unsigned int vendor_id, device_id;
 430         const char *s, *e;
 431         int *index;
 432
 433         s = (char*)buffer;
 434         e = s + count;
 435
 436         listctl = ptr;
 437         list = listctl->list;
 438         index = listctl->count;
 439
 440         *index = 0;
 441         while (*index < MAX_LISTED_PCI_DEVICES) {
 442
 443                 if (parse_one_device(&s,&e,&vendor_id,&device_id)) {
 444                         list[ *index ].vendor = vendor_id;
 445                         list[ *index ].device = device_id;
 446                         (*index)++;
 447                 }
 448
 449                 /* check for all data consume */
 450                 if (s >= e)
 451                         break;
 452         }
 453
 454         return count;
 455 }
 456
 457 #endif
 458 static ssize_t edac_pci_int_show(void *ptr, char *buffer)
 459 {
 460         int *value = ptr;
 461         return sprintf(buffer,"%d\n",*value);
 462 }
 463
 464 static ssize_t edac_pci_int_store(void *ptr, const char *buffer, size_t count)
 465 {
 466         int *value = ptr;
 467
 468         if (isdigit(*buffer))
 469                 *value = simple_strtoul(buffer,NULL,0);
 470
 471         return count;
 472 }
 473
 474 struct edac_pci_dev_attribute {
 475         struct attribute        attr;
 476         void    *value;
 477         ssize_t (*show)(void *,char *);
 478         ssize_t (*store)(void *, const char *,size_t);
 479 };
 480
 481 /* Set of show/store abstract level functions for PCI Parity object */
 482 static ssize_t edac_pci_dev_show(struct kobject *kobj, struct attribute *attr,
 483                                 char *buffer)
 484 {
 485         struct edac_pci_dev_attribute *edac_pci_dev;
 486         edac_pci_dev= (struct edac_pci_dev_attribute*)attr;
 487
 488         if (edac_pci_dev->show)
 489                 return edac_pci_dev->show(edac_pci_dev->value, buffer);
 490         return -EIO;
 491 }
 492
 493 static ssize_t edac_pci_dev_store(struct kobject *kobj, struct attribute *attr,
 494                                 const char *buffer, size_t count)
 495 {
 496         struct edac_pci_dev_attribute *edac_pci_dev;
 497         edac_pci_dev= (struct edac_pci_dev_attribute*)attr;
 498
 499         if (edac_pci_dev->show)
 500                 return edac_pci_dev->store(edac_pci_dev->value, buffer, count);
 501         return -EIO;
 502 }
 503
 504 static struct sysfs_ops edac_pci_sysfs_ops = {
 505         .show   = edac_pci_dev_show,
 506         .store  = edac_pci_dev_store
 507 };
 508
 509
 510 #define EDAC_PCI_ATTR(_name,_mode,_show,_store)                 \
 511 struct edac_pci_dev_attribute edac_pci_attr_##_name = {         \
 512         .attr = {.name = __stringify(_name), .mode = _mode },   \
 513         .value  = &_name,                                       \
 514         .show   = _show,                                        \
 515         .store  = _store,                                       \
 516 };
 517
 518 #define EDAC_PCI_STRING_ATTR(_name,_data,_mode,_show,_store)    \
 519 struct edac_pci_dev_attribute edac_pci_attr_##_name = {         \
 520         .attr = {.name = __stringify(_name), .mode = _mode },   \
 521         .value  = _data,                                        \
 522         .show   = _show,                                        \
 523         .store  = _store,                                       \
 524 };
 525
 526 #if 0
 527 static struct list_control pci_whitelist_control = {
 528         .list = pci_whitelist,
 529         .count = &pci_whitelist_count
 530 };
 531
 532 static struct list_control pci_blacklist_control = {
 533         .list = pci_blacklist,
 534         .count = &pci_blacklist_count
 535 };
 536
 537 /* whitelist attribute */
 538 EDAC_PCI_STRING_ATTR(pci_parity_whitelist,
 539         &pci_whitelist_control,
 540         S_IRUGO|S_IWUSR,
 541         edac_pci_list_string_show,
 542         edac_pci_list_string_store);
 543
 544 EDAC_PCI_STRING_ATTR(pci_parity_blacklist,
 545         &pci_blacklist_control,
 546         S_IRUGO|S_IWUSR,
 547         edac_pci_list_string_show,
 548         edac_pci_list_string_store);
 549 #endif
 550
 551 /* PCI Parity control files */
 552 EDAC_PCI_ATTR(check_pci_parity,S_IRUGO|S_IWUSR,edac_pci_int_show,edac_pci_int_store);
 553 EDAC_PCI_ATTR(panic_on_pci_parity,S_IRUGO|S_IWUSR,edac_pci_int_show,edac_pci_int_store);
 554 EDAC_PCI_ATTR(pci_parity_count,S_IRUGO,edac_pci_int_show,NULL);
 555
 556 /* Base Attributes of the memory ECC object */
 557 static struct edac_pci_dev_attribute *edac_pci_attr[] = {
 558         &edac_pci_attr_check_pci_parity,
 559         &edac_pci_attr_panic_on_pci_parity,
 560         &edac_pci_attr_pci_parity_count,
 561         NULL,
 562 };
 563
 564 /* No memory to release */
 565 static void edac_pci_release(struct kobject *kobj)
 566 {
 567         debugf1("EDAC PCI: " __FILE__ ": %s()\n", __func__);
 568 }
 569
 570 static struct kobj_type ktype_edac_pci = {
 571         .release        = edac_pci_release,
 572         .sysfs_ops      = &edac_pci_sysfs_ops,
 573         .default_attrs  = (struct attribute **) edac_pci_attr,
 574 };
 575
 576 #endif  /* DISABLE_EDAC_SYSFS */
 577
 578 /**
 579  * edac_sysfs_pci_setup()
 580  *
 581  */
 582 static int edac_sysfs_pci_setup(void)
 583 #ifdef DISABLE_EDAC_SYSFS
 584 {
 585         return 0;
 586 }
 587 #else
 588 {
 589         int err;
 590
 591         debugf1("MC: " __FILE__ ": %s()\n", __func__);
 592
 593         memset(&edac_pci_kobj, 0, sizeof(edac_pci_kobj));
 594
 595         kobject_init(&edac_pci_kobj);
 596         edac_pci_kobj.parent = &edac_class.kset.kobj;
 597         edac_pci_kobj.ktype = &ktype_edac_pci;
 598
 599         err = kobject_set_name(&edac_pci_kobj, "pci");
 600         if (!err) {
 601                 /* Instanstiate the csrow object */
 602                 /* FIXME: maybe new sysdev_create_subdir() */
 603                 err = kobject_register(&edac_pci_kobj);
 604                 if (err)
 605                         debugf1("Failed to register '.../edac/pci'\n");
 606                 else
 607                         debugf1("Registered '.../edac/pci' kobject\n");
 608         }
 609         return err;
 610 }
 611 #endif  /* DISABLE_EDAC_SYSFS */
 612
 613 static void edac_sysfs_pci_teardown(void)
 614 {
 615 #ifndef DISABLE_EDAC_SYSFS
 616         debugf0("MC: " __FILE__ ": %s()\n", __func__);
 617
 618         kobject_unregister(&edac_pci_kobj);
 619         kobject_put(&edac_pci_kobj);
 620 #endif
 621 }
 622
 623 #ifndef DISABLE_EDAC_SYSFS
 624
 625 /* EDAC sysfs CSROW data structures and methods */
 626
 627 /* Set of more detailed csrow<id> attribute show/store functions */
 628 static ssize_t csrow_ch0_dimm_label_show(struct csrow_info *csrow, char *data)
 629 {
 630         ssize_t size = 0;
 631
 632         if (csrow->nr_channels > 0) {
 633                 size = snprintf(data, EDAC_MC_LABEL_LEN,"%s\n",
 634                         csrow->channels[0].label);
 635         }
 636         return size;
 637 }
 638
 639 static ssize_t csrow_ch1_dimm_label_show(struct csrow_info *csrow, char *data)
 640 {
 641         ssize_t size = 0;
 642
 643         if (csrow->nr_channels > 0) {
 644                 size = snprintf(data, EDAC_MC_LABEL_LEN, "%s\n",
 645                         csrow->channels[1].label);
 646         }
 647         return size;
 648 }
 649
 650 static ssize_t csrow_ch0_dimm_label_store(struct csrow_info *csrow,
 651                         const char *data, size_t size)
 652 {
 653         ssize_t max_size = 0;
 654
 655         if (csrow->nr_channels > 0) {
 656                 max_size = min((ssize_t)size,(ssize_t)EDAC_MC_LABEL_LEN-1);
 657                 strncpy(csrow->channels[0].label, data, max_size);
 658                 csrow->channels[0].label[max_size] = '\0';
 659         }
 660         return size;
 661 }
 662
 663 static ssize_t csrow_ch1_dimm_label_store(struct csrow_info *csrow,
 664                         const char *data, size_t size)
 665 {
 666         ssize_t max_size = 0;
 667
 668         if (csrow->nr_channels > 1) {
 669                 max_size = min((ssize_t)size,(ssize_t)EDAC_MC_LABEL_LEN-1);
 670                 strncpy(csrow->channels[1].label, data, max_size);
 671                 csrow->channels[1].label[max_size] = '\0';
 672         }
 673         return max_size;
 674 }
 675
 676 static ssize_t csrow_ue_count_show(struct csrow_info *csrow, char *data)
 677 {
 678         return sprintf(data,"%u\n", csrow->ue_count);
 679 }
 680
 681 static ssize_t csrow_ce_count_show(struct csrow_info *csrow, char *data)
 682 {
 683         return sprintf(data,"%u\n", csrow->ce_count);
 684 }
 685
 686 static ssize_t csrow_ch0_ce_count_show(struct csrow_info *csrow, char *data)
 687 {
 688         ssize_t size = 0;
 689
 690         if (csrow->nr_channels > 0) {
 691                 size = sprintf(data,"%u\n", csrow->channels[0].ce_count);
 692         }
 693         return size;
 694 }
 695
 696 static ssize_t csrow_ch1_ce_count_show(struct csrow_info *csrow, char *data)
 697 {
 698         ssize_t size = 0;
 699
 700         if (csrow->nr_channels > 1) {
 701                 size = sprintf(data,"%u\n", csrow->channels[1].ce_count);
 702         }
 703         return size;
 704 }
 705
 706 static ssize_t csrow_size_show(struct csrow_info *csrow, char *data)
 707 {
 708         return sprintf(data,"%u\n", PAGES_TO_MiB(csrow->nr_pages));
 709 }
 710
 711 static ssize_t csrow_mem_type_show(struct csrow_info *csrow, char *data)
 712 {
 713         return sprintf(data,"%s\n", mem_types[csrow->mtype]);
 714 }
 715
 716 static ssize_t csrow_dev_type_show(struct csrow_info *csrow, char *data)
 717 {
 718         return sprintf(data,"%s\n", dev_types[csrow->dtype]);
 719 }
 720
 721 static ssize_t csrow_edac_mode_show(struct csrow_info *csrow, char *data)
 722 {
 723         return sprintf(data,"%s\n", edac_caps[csrow->edac_mode]);
 724 }
 725
 726 struct csrowdev_attribute {
 727         struct attribute        attr;
 728         ssize_t (*show)(struct csrow_info *,char *);
 729         ssize_t (*store)(struct csrow_info *, const char *,size_t);
 730 };
 731
 732 #define to_csrow(k) container_of(k, struct csrow_info, kobj)
 733 #define to_csrowdev_attr(a) container_of(a, struct csrowdev_attribute, attr)
 734
 735 /* Set of show/store higher level functions for csrow objects */
 736 static ssize_t csrowdev_show(struct kobject *kobj, struct attribute *attr,
 737                                 char *buffer)
 738 {
 739         struct csrow_info *csrow = to_csrow(kobj);
 740         struct csrowdev_attribute *csrowdev_attr = to_csrowdev_attr(attr);
 741
 742         if (csrowdev_attr->show)
 743                 return csrowdev_attr->show(csrow, buffer);
 744         return -EIO;
 745 }
 746
 747 static ssize_t csrowdev_store(struct kobject *kobj, struct attribute *attr,
 748                                 const char *buffer, size_t count)
 749 {
 750         struct csrow_info *csrow = to_csrow(kobj);
 751         struct csrowdev_attribute * csrowdev_attr = to_csrowdev_attr(attr);
 752
 753         if (csrowdev_attr->store)
 754                 return csrowdev_attr->store(csrow, buffer, count);
 755         return -EIO;
 756 }
 757
 758 static struct sysfs_ops csrowfs_ops = {
 759         .show   = csrowdev_show,
 760         .store  = csrowdev_store
 761 };
 762
 763 #define CSROWDEV_ATTR(_name,_mode,_show,_store)                 \
 764 struct csrowdev_attribute attr_##_name = {                      \
 765         .attr = {.name = __stringify(_name), .mode = _mode },   \
 766         .show   = _show,                                        \
 767         .store  = _store,                                       \
 768 };
 769
 770 /* cwrow<id>/attribute files */
 771 CSROWDEV_ATTR(size_mb,S_IRUGO,csrow_size_show,NULL);
 772 CSROWDEV_ATTR(dev_type,S_IRUGO,csrow_dev_type_show,NULL);
 773 CSROWDEV_ATTR(mem_type,S_IRUGO,csrow_mem_type_show,NULL);
 774 CSROWDEV_ATTR(edac_mode,S_IRUGO,csrow_edac_mode_show,NULL);
 775 CSROWDEV_ATTR(ue_count,S_IRUGO,csrow_ue_count_show,NULL);
 776 CSROWDEV_ATTR(ce_count,S_IRUGO,csrow_ce_count_show,NULL);
 777 CSROWDEV_ATTR(ch0_ce_count,S_IRUGO,csrow_ch0_ce_count_show,NULL);
 778 CSROWDEV_ATTR(ch1_ce_count,S_IRUGO,csrow_ch1_ce_count_show,NULL);
 779
 780 /* control/attribute files */
 781 CSROWDEV_ATTR(ch0_dimm_label,S_IRUGO|S_IWUSR,
 782                 csrow_ch0_dimm_label_show,
 783                 csrow_ch0_dimm_label_store);
 784 CSROWDEV_ATTR(ch1_dimm_label,S_IRUGO|S_IWUSR,
 785                 csrow_ch1_dimm_label_show,
 786                 csrow_ch1_dimm_label_store);
 787
 788
 789 /* Attributes of the CSROW<id> object */
 790 static struct csrowdev_attribute *csrow_attr[] = {
 791         &attr_dev_type,
 792         &attr_mem_type,
 793         &attr_edac_mode,
 794         &attr_size_mb,
 795         &attr_ue_count,
 796         &attr_ce_count,
 797         &attr_ch0_ce_count,
 798         &attr_ch1_ce_count,
 799         &attr_ch0_dimm_label,
 800         &attr_ch1_dimm_label,
 801         NULL,
 802 };
 803
 804
 805 /* No memory to release */
 806 static void edac_csrow_instance_release(struct kobject *kobj)
 807 {
 808         debugf1("EDAC MC: " __FILE__ ": %s()\n", __func__);
 809 }
 810
 811 static struct kobj_type ktype_csrow = {
 812         .release        = edac_csrow_instance_release,
 813         .sysfs_ops      = &csrowfs_ops,
 814         .default_attrs  = (struct attribute **) csrow_attr,
 815 };
 816
 817 /* Create a CSROW object under specifed edac_mc_device */
 818 static int edac_create_csrow_object(struct kobject *edac_mci_kobj,
 819                                 struct csrow_info *csrow, int index )
 820 {
 821         int err = 0;
 822
 823         debugf0("MC: " __FILE__ ": %s()\n", __func__);
 824
 825         memset(&csrow->kobj, 0, sizeof(csrow->kobj));
 826
 827         /* generate ..../edac/mc/mc<id>/csrow<index>   */
 828
 829         kobject_init(&csrow->kobj);
 830         csrow->kobj.parent = edac_mci_kobj;
 831         csrow->kobj.ktype = &ktype_csrow;
 832
 833         /* name this instance of csrow<id> */
 834         err = kobject_set_name(&csrow->kobj,"csrow%d",index);
 835         if (!err) {
 836                 /* Instanstiate the csrow object */
 837                 err = kobject_register(&csrow->kobj);
 838                 if (err)
 839                         debugf0("Failed to register CSROW%d\n",index);
 840                 else
 841                         debugf0("Registered CSROW%d\n",index);
 842         }
 843
 844         return err;
 845 }
 846
 847 /* sysfs data structures and methods for the MCI kobjects */
 848
 849 static ssize_t mci_reset_counters_store(struct mem_ctl_info  *mci,
 850                                         const char *data, size_t count )
 851 {
 852         int row, chan;
 853
 854         mci->ue_noinfo_count = 0;
 855         mci->ce_noinfo_count = 0;
 856         mci->ue_count = 0;
 857         mci->ce_count = 0;
 858         for (row = 0; row < mci->nr_csrows; row++) {
 859                 struct csrow_info *ri = &mci->csrows[row];
 860
 861                 ri->ue_count = 0;
 862                 ri->ce_count = 0;
 863                 for (chan = 0; chan < ri->nr_channels; chan++)
 864                         ri->channels[chan].ce_count = 0;
 865         }
 866         mci->start_time = jiffies;
 867
 868         return count;
 869 }
 870
 871 static ssize_t mci_ue_count_show(struct mem_ctl_info *mci, char *data)
 872 {
 873         return sprintf(data,"%d\n", mci->ue_count);
 874 }
 875
 876 static ssize_t mci_ce_count_show(struct mem_ctl_info *mci, char *data)
 877 {
 878         return sprintf(data,"%d\n", mci->ce_count);
 879 }
 880
 881 static ssize_t mci_ce_noinfo_show(struct mem_ctl_info *mci, char *data)
 882 {
 883         return sprintf(data,"%d\n", mci->ce_noinfo_count);
 884 }
 885
 886 static ssize_t mci_ue_noinfo_show(struct mem_ctl_info *mci, char *data)
 887 {
 888         return sprintf(data,"%d\n", mci->ue_noinfo_count);
 889 }
 890
 891 static ssize_t mci_seconds_show(struct mem_ctl_info *mci, char *data)
 892 {
 893         return sprintf(data,"%ld\n", (jiffies - mci->start_time) / HZ);
 894 }
 895
 896 static ssize_t mci_mod_name_show(struct mem_ctl_info *mci, char *data)
 897 {
 898         return sprintf(data,"%s %s\n", mci->mod_name, mci->mod_ver);
 899 }
 900
 901 static ssize_t mci_ctl_name_show(struct mem_ctl_info *mci, char *data)
 902 {
 903         return sprintf(data,"%s\n", mci->ctl_name);
 904 }
 905
 906 static int mci_output_edac_cap(char *buf, unsigned long edac_cap)
 907 {
 908         char *p = buf;
 909         int bit_idx;
 910
 911         for (bit_idx = 0; bit_idx < 8 * sizeof(edac_cap); bit_idx++) {
 912                 if ((edac_cap >> bit_idx) & 0x1)
 913                         p += sprintf(p, "%s ", edac_caps[bit_idx]);
 914         }
 915
 916         return p - buf;
 917 }
 918
 919 static ssize_t mci_edac_capability_show(struct mem_ctl_info *mci, char *data)
 920 {
 921         char *p = data;
 922
 923         p += mci_output_edac_cap(p,mci->edac_ctl_cap);
 924         p += sprintf(p, "\n");
 925
 926         return p - data;
 927 }
 928
 929 static ssize_t mci_edac_current_capability_show(struct mem_ctl_info *mci,
 930                                                 char *data)
 931 {
 932         char *p = data;
 933
 934         p += mci_output_edac_cap(p,mci->edac_cap);
 935         p += sprintf(p, "\n");
 936
 937         return p - data;
 938 }
 939
 940 static int mci_output_mtype_cap(char *buf, unsigned long mtype_cap)
 941 {
 942         char *p = buf;
 943         int bit_idx;
 944
 945         for (bit_idx = 0; bit_idx < 8 * sizeof(mtype_cap); bit_idx++) {
 946                 if ((mtype_cap >> bit_idx) & 0x1)
 947                         p += sprintf(p, "%s ", mem_types[bit_idx]);
 948         }
 949
 950         return p - buf;
 951 }
 952
 953 static ssize_t mci_supported_mem_type_show(struct mem_ctl_info *mci, char *data)
 954 {
 955         char *p = data;
 956
 957         p += mci_output_mtype_cap(p,mci->mtype_cap);
 958         p += sprintf(p, "\n");
 959
 960         return p - data;
 961 }
 962
 963 static ssize_t mci_size_mb_show(struct mem_ctl_info *mci, char *data)
 964 {
 965         int total_pages, csrow_idx;
 966
 967         for (total_pages = csrow_idx = 0; csrow_idx < mci->nr_csrows;
 968                         csrow_idx++) {
 969                 struct csrow_info *csrow = &mci->csrows[csrow_idx];
 970
 971                 if (!csrow->nr_pages)
 972                         continue;
 973                 total_pages += csrow->nr_pages;
 974         }
 975
 976         return sprintf(data,"%u\n", PAGES_TO_MiB(total_pages));
 977 }
 978
 979 struct mcidev_attribute {
 980         struct attribute        attr;
 981         ssize_t (*show)(struct mem_ctl_info *,char *);
 982         ssize_t (*store)(struct mem_ctl_info *, const char *,size_t);
 983 };
 984
 985 #define to_mci(k) container_of(k, struct mem_ctl_info, edac_mci_kobj)
 986 #define to_mcidev_attr(a) container_of(a, struct mcidev_attribute, attr)
 987
 988 static ssize_t mcidev_show(struct kobject *kobj, struct attribute *attr,
 989                         char *buffer)
 990 {
 991         struct mem_ctl_info *mem_ctl_info = to_mci(kobj);
 992         struct mcidev_attribute * mcidev_attr = to_mcidev_attr(attr);
 993
 994         if (mcidev_attr->show)
 995                 return mcidev_attr->show(mem_ctl_info, buffer);
 996         return -EIO;
 997 }
 998
 999 static ssize_t mcidev_store(struct kobject *kobj, struct attribute *attr,
1000                                 const char *buffer, size_t count)
1001 {
1002         struct mem_ctl_info *mem_ctl_info = to_mci(kobj);
1003         struct mcidev_attribute * mcidev_attr = to_mcidev_attr(attr);
1004
1005         if (mcidev_attr->store)
1006                 return mcidev_attr->store(mem_ctl_info, buffer, count);
1007         return -EIO;
1008 }
1009
1010 static struct sysfs_ops mci_ops = {
1011         .show   = mcidev_show,
1012         .store  = mcidev_store
1013 };
1014
1015 #define MCIDEV_ATTR(_name,_mode,_show,_store)                   \
1016 struct mcidev_attribute mci_attr_##_name = {                    \
1017         .attr = {.name = __stringify(_name), .mode = _mode },   \
1018         .show   = _show,                                        \
1019         .store  = _store,                                       \
1020 };
1021
1022 /* Control file */
1023 MCIDEV_ATTR(reset_counters,S_IWUSR,NULL,mci_reset_counters_store);
1024
1025 /* Attribute files */
1026 MCIDEV_ATTR(mc_name,S_IRUGO,mci_ctl_name_show,NULL);
1027 MCIDEV_ATTR(module_name,S_IRUGO,mci_mod_name_show,NULL);
1028 MCIDEV_ATTR(edac_capability,S_IRUGO,mci_edac_capability_show,NULL);
1029 MCIDEV_ATTR(size_mb,S_IRUGO,mci_size_mb_show,NULL);
1030 MCIDEV_ATTR(seconds_since_reset,S_IRUGO,mci_seconds_show,NULL);
1031 MCIDEV_ATTR(ue_noinfo_count,S_IRUGO,mci_ue_noinfo_show,NULL);
1032 MCIDEV_ATTR(ce_noinfo_count,S_IRUGO,mci_ce_noinfo_show,NULL);
1033 MCIDEV_ATTR(ue_count,S_IRUGO,mci_ue_count_show,NULL);
1034 MCIDEV_ATTR(ce_count,S_IRUGO,mci_ce_count_show,NULL);
1035 MCIDEV_ATTR(edac_current_capability,S_IRUGO,
1036         mci_edac_current_capability_show,NULL);
1037 MCIDEV_ATTR(supported_mem_type,S_IRUGO,
1038         mci_supported_mem_type_show,NULL);
1039
1040
1041 static struct mcidev_attribute *mci_attr[] = {
1042         &mci_attr_reset_counters,
1043         &mci_attr_module_name,
1044         &mci_attr_mc_name,
1045         &mci_attr_edac_capability,
1046         &mci_attr_edac_current_capability,
1047         &mci_attr_supported_mem_type,
1048         &mci_attr_size_mb,
1049         &mci_attr_seconds_since_reset,
1050         &mci_attr_ue_noinfo_count,
1051         &mci_attr_ce_noinfo_count,
1052         &mci_attr_ue_count,
1053         &mci_attr_ce_count,
1054         NULL
1055 };
1056
1057
1058 /*
1059  * Release of a MC controlling instance
1060  */
1061 static void edac_mci_instance_release(struct kobject *kobj)
1062 {
1063         struct mem_ctl_info *mci;
1064         mci = container_of(kobj,struct mem_ctl_info,edac_mci_kobj);
1065
1066         debugf0("MC: " __FILE__ ": %s() idx=%d calling kfree\n",
1067                 __func__, mci->mc_idx);
1068
1069         kfree(mci);
1070 }
1071
1072 static struct kobj_type ktype_mci = {
1073         .release        = edac_mci_instance_release,
1074         .sysfs_ops      = &mci_ops,
1075         .default_attrs  = (struct attribute **) mci_attr,
1076 };
1077
1078 #endif  /* DISABLE_EDAC_SYSFS */
1079
1080 #define EDAC_DEVICE_SYMLINK     "device"
1081
1082 /*
1083  * Create a new Memory Controller kobject instance,
1084  *      mc<id> under the 'mc' directory
1085  *
1086  * Return:
1087  *      0       Success
1088  *      !0      Failure
1089  */
1090 static int edac_create_sysfs_mci_device(struct mem_ctl_info *mci)
1091 #ifdef DISABLE_EDAC_SYSFS
1092 {
1093         return 0;
1094 }
1095 #else
1096 {
1097         int i;
1098         int err;
1099         struct csrow_info *csrow;
1100         struct kobject *edac_mci_kobj=&mci->edac_mci_kobj;
1101
1102         debugf0("MC: " __FILE__ ": %s() idx=%d\n", __func__, mci->mc_idx);
1103
1104         memset(edac_mci_kobj, 0, sizeof(*edac_mci_kobj));
1105         kobject_init(edac_mci_kobj);
1106
1107         /* set the name of the mc<id> object */
1108         err = kobject_set_name(edac_mci_kobj,"mc%d",mci->mc_idx);
1109         if (err)
1110                 return err;
1111
1112         /* link to our parent the '..../edac/mc' object */
1113         edac_mci_kobj->parent = &edac_memctrl_kobj;
1114         edac_mci_kobj->ktype = &ktype_mci;
1115
1116         /* register the mc<id> kobject */
1117         err = kobject_register(edac_mci_kobj);
1118         if (err)
1119                 return err;
1120
1121         /* create a symlink for the device */
1122         err = sysfs_create_link(edac_mci_kobj, &mci->pdev->dev.kobj,
1123                                 EDAC_DEVICE_SYMLINK);
1124         if (err) {
1125                 kobject_unregister(edac_mci_kobj);
1126                 return err;
1127         }
1128
1129         /* Make directories for each CSROW object
1130          * under the mc<id> kobject
1131          */
1132         for (i = 0; i < mci->nr_csrows; i++) {
1133
1134                 csrow = &mci->csrows[i];
1135
1136                 /* Only expose populated CSROWs */
1137                 if (csrow->nr_pages > 0) {
1138                         err = edac_create_csrow_object(edac_mci_kobj,csrow,i);
1139                         if (err)
1140                                 goto fail;
1141                 }
1142         }
1143
1144         /* Mark this MCI instance as having sysfs entries */
1145         mci->sysfs_active = MCI_SYSFS_ACTIVE;
1146
1147         return 0;
1148
1149
1150         /* CSROW error: backout what has already been registered,  */
1151 fail:
1152         for ( i--; i >= 0; i--) {
1153                 if (csrow->nr_pages > 0) {
1154                         kobject_unregister(&mci->csrows[i].kobj);
1155                         kobject_put(&mci->csrows[i].kobj);
1156                 }
1157         }
1158
1159         kobject_unregister(edac_mci_kobj);
1160         kobject_put(edac_mci_kobj);
1161
1162         return err;
1163 }
1164 #endif  /* DISABLE_EDAC_SYSFS */
1165
1166 /*
1167  * remove a Memory Controller instance
1168  */
1169 static void edac_remove_sysfs_mci_device(struct mem_ctl_info *mci)
1170 {
1171 #ifndef DISABLE_EDAC_SYSFS
1172         int i;
1173
1174         debugf0("MC: " __FILE__ ": %s()\n", __func__);
1175
1176         /* remove all csrow kobjects */
1177         for (i = 0; i < mci->nr_csrows; i++) {
1178                 if (mci->csrows[i].nr_pages > 0)  {
1179                         kobject_unregister(&mci->csrows[i].kobj);
1180                         kobject_put(&mci->csrows[i].kobj);
1181                 }
1182         }
1183
1184         sysfs_remove_link(&mci->edac_mci_kobj, EDAC_DEVICE_SYMLINK);
1185
1186         kobject_unregister(&mci->edac_mci_kobj);
1187         kobject_put(&mci->edac_mci_kobj);
1188 #endif  /* DISABLE_EDAC_SYSFS */
1189 }
1190
1191 /* END OF sysfs data and methods */
1192
1193 #ifdef CONFIG_EDAC_DEBUG
1194
1195 EXPORT_SYMBOL(edac_mc_dump_channel);
1196
1197 void edac_mc_dump_channel(struct channel_info *chan)
1198 {
1199         debugf4("\tchannel = %p\n", chan);
1200         debugf4("\tchannel->chan_idx = %d\n", chan->chan_idx);
1201         debugf4("\tchannel->ce_count = %d\n", chan->ce_count);
1202         debugf4("\tchannel->label = '%s'\n", chan->label);
1203         debugf4("\tchannel->csrow = %p\n\n", chan->csrow);
1204 }
1205
1206
1207 EXPORT_SYMBOL(edac_mc_dump_csrow);
1208
1209 void edac_mc_dump_csrow(struct csrow_info *csrow)
1210 {
1211         debugf4("\tcsrow = %p\n", csrow);
1212         debugf4("\tcsrow->csrow_idx = %d\n", csrow->csrow_idx);
1213         debugf4("\tcsrow->first_page = 0x%lx\n",
1214                 csrow->first_page);
1215         debugf4("\tcsrow->last_page = 0x%lx\n", csrow->last_page);
1216         debugf4("\tcsrow->page_mask = 0x%lx\n", csrow->page_mask);
1217         debugf4("\tcsrow->nr_pages = 0x%x\n", csrow->nr_pages);
1218         debugf4("\tcsrow->nr_channels = %d\n",
1219                 csrow->nr_channels);
1220         debugf4("\tcsrow->channels = %p\n", csrow->channels);
1221         debugf4("\tcsrow->mci = %p\n\n", csrow->mci);
1222 }
1223
1224
1225 EXPORT_SYMBOL(edac_mc_dump_mci);
1226
1227 void edac_mc_dump_mci(struct mem_ctl_info *mci)
1228 {
1229         debugf3("\tmci = %p\n", mci);
1230         debugf3("\tmci->mtype_cap = %lx\n", mci->mtype_cap);
1231         debugf3("\tmci->edac_ctl_cap = %lx\n", mci->edac_ctl_cap);
1232         debugf3("\tmci->edac_cap = %lx\n", mci->edac_cap);
1233         debugf4("\tmci->edac_check = %p\n", mci->edac_check);
1234         debugf3("\tmci->nr_csrows = %d, csrows = %p\n",
1235                 mci->nr_csrows, mci->csrows);
1236         debugf3("\tpdev = %p\n", mci->pdev);
1237         debugf3("\tmod_name:ctl_name = %s:%s\n",
1238                 mci->mod_name, mci->ctl_name);
1239         debugf3("\tpvt_info = %p\n\n", mci->pvt_info);
1240 }
1241
1242
1243 #endif                          /* CONFIG_EDAC_DEBUG */
1244
1245 /* 'ptr' points to a possibly unaligned item X such that sizeof(X) is 'size'.
1246  * Adjust 'ptr' so that its alignment is at least as stringent as what the
1247  * compiler would provide for X and return the aligned result.
1248  *
1249  * If 'size' is a constant, the compiler will optimize this whole function
1250  * down to either a no-op or the addition of a constant to the value of 'ptr'.
1251  */
1252 static inline char * align_ptr (void *ptr, unsigned size)
1253 {
1254         unsigned align, r;
1255
1256         /* Here we assume that the alignment of a "long long" is the most
1257          * stringent alignment that the compiler will ever provide by default.
1258          * As far as I know, this is a reasonable assumption.
1259          */
1260         if (size > sizeof(long))
1261                 align = sizeof(long long);
1262         else if (size > sizeof(int))
1263                 align = sizeof(long);
1264         else if (size > sizeof(short))
1265                 align = sizeof(int);
1266         else if (size > sizeof(char))
1267                 align = sizeof(short);
1268         else
1269                 return (char *) ptr;
1270
1271         r = size % align;
1272
1273         if (r == 0)
1274                 return (char *) ptr;
1275
1276         return (char *) (((unsigned long) ptr) + align - r);
1277 }
1278
1279
1280 EXPORT_SYMBOL(edac_mc_alloc);
1281
1282 /**
1283  * edac_mc_alloc: Allocate a struct mem_ctl_info structure
1284  * @size_pvt:   size of private storage needed
1285  * @nr_csrows:  Number of CWROWS needed for this MC
1286  * @nr_chans:   Number of channels for the MC
1287  *
1288  * Everything is kmalloc'ed as one big chunk - more efficient.
1289  * Only can be used if all structures have the same lifetime - otherwise
1290  * you have to allocate and initialize your own structures.
1291  *
1292  * Use edac_mc_free() to free mc structures allocated by this function.
1293  *
1294  * Returns:
1295  *      NULL allocation failed
1296  *      struct mem_ctl_info pointer
1297  */
1298 struct mem_ctl_info *edac_mc_alloc(unsigned sz_pvt, unsigned nr_csrows,
1299                                         unsigned nr_chans)
1300 {
1301         struct mem_ctl_info *mci;
1302         struct csrow_info *csi, *csrow;
1303         struct channel_info *chi, *chp, *chan;
1304         void *pvt;
1305         unsigned size;
1306         int row, chn;
1307
1308         /* Figure out the offsets of the various items from the start of an mc
1309          * structure.  We want the alignment of each item to be at least as
1310          * stringent as what the compiler would provide if we could simply
1311          * hardcode everything into a single struct.
1312          */
1313         mci = (struct mem_ctl_info *) 0;
1314         csi = (struct csrow_info *)align_ptr(&mci[1], sizeof(*csi));
1315         chi = (struct channel_info *)
1316                         align_ptr(&csi[nr_csrows], sizeof(*chi));
1317         pvt = align_ptr(&chi[nr_chans * nr_csrows], sz_pvt);
1318         size = ((unsigned long) pvt) + sz_pvt;
1319
1320         if ((mci = kmalloc(size, GFP_KERNEL)) == NULL)
1321                 return NULL;
1322
1323         /* Adjust pointers so they point within the memory we just allocated
1324          * rather than an imaginary chunk of memory located at address 0.
1325          */
1326         csi = (struct csrow_info *) (((char *) mci) + ((unsigned long) csi));
1327         chi = (struct channel_info *) (((char *) mci) + ((unsigned long) chi));
1328         pvt = sz_pvt ? (((char *) mci) + ((unsigned long) pvt)) : NULL;
1329
1330         memset(mci, 0, size);   /* clear all fields */
1331
1332         mci->csrows = csi;
1333         mci->pvt_info = pvt;
1334         mci->nr_csrows = nr_csrows;
1335
1336         for (row = 0; row < nr_csrows; row++) {
1337                 csrow = &csi[row];
1338                 csrow->csrow_idx = row;
1339                 csrow->mci = mci;
1340                 csrow->nr_channels = nr_chans;
1341                 chp = &chi[row * nr_chans];
1342                 csrow->channels = chp;
1343
1344                 for (chn = 0; chn < nr_chans; chn++) {
1345                         chan = &chp[chn];
1346                         chan->chan_idx = chn;
1347                         chan->csrow = csrow;
1348                 }
1349         }
1350
1351         return mci;
1352 }
1353
1354
1355 EXPORT_SYMBOL(edac_mc_free);
1356
1357 /**
1358  * edac_mc_free:  Free a previously allocated 'mci' structure
1359  * @mci: pointer to a struct mem_ctl_info structure
1360  *
1361  * Free up a previously allocated mci structure
1362  * A MCI structure can be in 2 states after being allocated
1363  * by edac_mc_alloc().
1364  *      1) Allocated in a MC driver's probe, but not yet committed
1365  *      2) Allocated and committed, by a call to  edac_mc_add_mc()
1366  * edac_mc_add_mc() is the function that adds the sysfs entries
1367  * thus, this free function must determine which state the 'mci'
1368  * structure is in, then either free it directly or
1369  * perform kobject cleanup by calling edac_remove_sysfs_mci_device().
1370  *
1371  * VOID Return
1372  */
1373 void edac_mc_free(struct mem_ctl_info *mci)
1374 {
1375         /* only if sysfs entries for this mci instance exist
1376          * do we remove them and defer the actual kfree via
1377          * the kobject 'release()' callback.
1378          *
1379          * Otherwise, do a straight kfree now.
1380          */
1381         if (mci->sysfs_active == MCI_SYSFS_ACTIVE)
1382                 edac_remove_sysfs_mci_device(mci);
1383         else
1384                 kfree(mci);
1385 }
1386
1387
1388
1389 EXPORT_SYMBOL(edac_mc_find_mci_by_pdev);
1390
1391 struct mem_ctl_info *edac_mc_find_mci_by_pdev(struct pci_dev *pdev)
1392 {
1393         struct mem_ctl_info *mci;
1394         struct list_head *item;
1395
1396         debugf3("MC: " __FILE__ ": %s()\n", __func__);
1397
1398         list_for_each(item, &mc_devices) {
1399                 mci = list_entry(item, struct mem_ctl_info, link);
1400
1401                 if (mci->pdev == pdev)
1402                         return mci;
1403         }
1404
1405         return NULL;
1406 }
1407
1408 static int add_mc_to_global_list (struct mem_ctl_info *mci)
1409 {
1410         struct list_head *item, *insert_before;
1411         struct mem_ctl_info *p;
1412         int i;
1413
1414         if (list_empty(&mc_devices)) {
1415                 mci->mc_idx = 0;
1416                 insert_before = &mc_devices;
1417         } else {
1418                 if (edac_mc_find_mci_by_pdev(mci->pdev)) {
1419                         printk(KERN_WARNING
1420                                 "EDAC MC: %s (%s) %s %s already assigned %d\n",
1421                                 mci->pdev->dev.bus_id, pci_name(mci->pdev),
1422                                 mci->mod_name, mci->ctl_name, mci->mc_idx);
1423                         return 1;
1424                 }
1425
1426                 insert_before = NULL;
1427                 i = 0;
1428
1429                 list_for_each(item, &mc_devices) {
1430                         p = list_entry(item, struct mem_ctl_info, link);
1431
1432                         if (p->mc_idx != i) {
1433                                 insert_before = item;
1434                                 break;
1435                         }
1436
1437                         i++;
1438                 }
1439
1440                 mci->mc_idx = i;
1441
1442                 if (insert_before == NULL)
1443                         insert_before = &mc_devices;
1444         }
1445
1446         list_add_tail_rcu(&mci->link, insert_before);
1447         return 0;
1448 }
1449
1450
1451
1452 EXPORT_SYMBOL(edac_mc_add_mc);
1453
1454 /**
1455  * edac_mc_add_mc: Insert the 'mci' structure into the mci global list
1456  * @mci: pointer to the mci structure to be added to the list
1457  *
1458  * Return:
1459  *      0       Success
1460  *      !0      Failure
1461  */
1462
1463 /* FIXME - should a warning be printed if no error detection? correction? */
1464 int edac_mc_add_mc(struct mem_ctl_info *mci)
1465 {
1466         int rc = 1;
1467
1468         debugf0("MC: " __FILE__ ": %s()\n", __func__);
1469 #ifdef CONFIG_EDAC_DEBUG
1470         if (edac_debug_level >= 3)
1471                 edac_mc_dump_mci(mci);
1472         if (edac_debug_level >= 4) {
1473                 int i;
1474
1475                 for (i = 0; i < mci->nr_csrows; i++) {
1476                         int j;
1477                         edac_mc_dump_csrow(&mci->csrows[i]);
1478                         for (j = 0; j < mci->csrows[i].nr_channels; j++)
1479                                 edac_mc_dump_channel(&mci->csrows[i].
1480                                                           channels[j]);
1481                 }
1482         }
1483 #endif
1484         down(&mem_ctls_mutex);
1485
1486         if (add_mc_to_global_list(mci))
1487                 goto finish;
1488
1489         /* set load time so that error rate can be tracked */
1490         mci->start_time = jiffies;
1491
1492         if (edac_create_sysfs_mci_device(mci)) {
1493                 printk(KERN_WARNING
1494                        "EDAC MC%d: failed to create sysfs device\n",
1495                        mci->mc_idx);
1496                 /* FIXME - should there be an error code and unwind? */
1497                 goto finish;
1498         }
1499
1500         /* Report action taken */
1501         printk(KERN_INFO
1502                "EDAC MC%d: Giving out device to %s %s: PCI %s\n",
1503                mci->mc_idx, mci->mod_name, mci->ctl_name,
1504                pci_name(mci->pdev));
1505
1506
1507         rc = 0;
1508
1509 finish:
1510         up(&mem_ctls_mutex);
1511         return rc;
1512 }
1513
1514
1515
1516 static void complete_mc_list_del (struct rcu_head *head)
1517 {
1518         struct mem_ctl_info *mci;
1519
1520         mci = container_of(head, struct mem_ctl_info, rcu);
1521         INIT_LIST_HEAD(&mci->link);
1522         complete(&mci->complete);
1523 }
1524
1525 static void del_mc_from_global_list (struct mem_ctl_info *mci)
1526 {
1527         list_del_rcu(&mci->link);
1528         init_completion(&mci->complete);
1529         call_rcu(&mci->rcu, complete_mc_list_del);
1530         wait_for_completion(&mci->complete);
1531 }
1532
1533 EXPORT_SYMBOL(edac_mc_del_mc);
1534
1535 /**
1536  * edac_mc_del_mc:  Remove the specified mci structure from global list
1537  * @mci:        Pointer to struct mem_ctl_info structure
1538  *
1539  * Returns:
1540  *      0       Success
1541  *      1       Failure
1542  */
1543 int edac_mc_del_mc(struct mem_ctl_info *mci)
1544 {
1545         int rc = 1;
1546
1547         debugf0("MC%d: " __FILE__ ": %s()\n", mci->mc_idx, __func__);
1548         down(&mem_ctls_mutex);
1549         del_mc_from_global_list(mci);
1550         printk(KERN_INFO
1551                "EDAC MC%d: Removed device %d for %s %s: PCI %s\n",
1552                mci->mc_idx, mci->mc_idx, mci->mod_name, mci->ctl_name,
1553                pci_name(mci->pdev));
1554         rc = 0;
1555         up(&mem_ctls_mutex);
1556
1557         return rc;
1558 }
1559
1560
1561 EXPORT_SYMBOL(edac_mc_scrub_block);
1562
1563 void edac_mc_scrub_block(unsigned long page, unsigned long offset,
1564                               u32 size)
1565 {
1566         struct page *pg;
1567         void *virt_addr;
1568         unsigned long flags = 0;
1569
1570         debugf3("MC: " __FILE__ ": %s()\n", __func__);
1571
1572         /* ECC error page was not in our memory. Ignore it. */
1573         if(!pfn_valid(page))
1574                 return;
1575
1576         /* Find the actual page structure then map it and fix */
1577         pg = pfn_to_page(page);
1578
1579         if (PageHighMem(pg))
1580                 local_irq_save(flags);
1581
1582         virt_addr = kmap_atomic(pg, KM_BOUNCE_READ);
1583
1584         /* Perform architecture specific atomic scrub operation */
1585         atomic_scrub(virt_addr + offset, size);
1586
1587         /* Unmap and complete */
1588         kunmap_atomic(virt_addr, KM_BOUNCE_READ);
1589
1590         if (PageHighMem(pg))
1591                 local_irq_restore(flags);
1592 }
1593
1594
1595 /* FIXME - should return -1 */
1596 EXPORT_SYMBOL(edac_mc_find_csrow_by_page);
1597
1598 int edac_mc_find_csrow_by_page(struct mem_ctl_info *mci,
1599                                     unsigned long page)
1600 {
1601         struct csrow_info *csrows = mci->csrows;
1602         int row, i;
1603
1604         debugf1("MC%d: " __FILE__ ": %s(): 0x%lx\n", mci->mc_idx, __func__,
1605                 page);
1606         row = -1;
1607
1608         for (i = 0; i < mci->nr_csrows; i++) {
1609                 struct csrow_info *csrow = &csrows[i];
1610
1611                 if (csrow->nr_pages == 0)
1612                         continue;
1613
1614                 debugf3("MC%d: " __FILE__
1615                         ": %s(): first(0x%lx) page(0x%lx)"
1616                         " last(0x%lx) mask(0x%lx)\n", mci->mc_idx,
1617                         __func__, csrow->first_page, page,
1618                         csrow->last_page, csrow->page_mask);
1619
1620                 if ((page >= csrow->first_page) &&
1621                     (page <= csrow->last_page) &&
1622                     ((page & csrow->page_mask) ==
1623                      (csrow->first_page & csrow->page_mask))) {
1624                         row = i;
1625                         break;
1626                 }
1627         }
1628
1629         if (row == -1)
1630                 printk(KERN_ERR
1631                        "EDAC MC%d: could not look up page error address %lx\n",
1632                        mci->mc_idx, (unsigned long) page);
1633
1634         return row;
1635 }
1636
1637
1638 EXPORT_SYMBOL(edac_mc_handle_ce);
1639
1640 /* FIXME - setable log (warning/emerg) levels */
1641 /* FIXME - integrate with evlog: http://evlog.sourceforge.net/ */
1642 void edac_mc_handle_ce(struct mem_ctl_info *mci,
1643                             unsigned long page_frame_number,
1644                             unsigned long offset_in_page,
1645                             unsigned long syndrome, int row, int channel,
1646                             const char *msg)
1647 {
1648         unsigned long remapped_page;
1649
1650         debugf3("MC%d: " __FILE__ ": %s()\n", mci->mc_idx, __func__);
1651
1652         /* FIXME - maybe make panic on INTERNAL ERROR an option */
1653         if (row >= mci->nr_csrows || row < 0) {
1654                 /* something is wrong */
1655                 printk(KERN_ERR
1656                        "EDAC MC%d: INTERNAL ERROR: row out of range (%d >= %d)\n",
1657                        mci->mc_idx, row, mci->nr_csrows);
1658                 edac_mc_handle_ce_no_info(mci, "INTERNAL ERROR");
1659                 return;
1660         }
1661         if (channel >= mci->csrows[row].nr_channels || channel < 0) {
1662                 /* something is wrong */
1663                 printk(KERN_ERR
1664                        "EDAC MC%d: INTERNAL ERROR: channel out of range "
1665                        "(%d >= %d)\n",
1666                        mci->mc_idx, channel, mci->csrows[row].nr_channels);
1667                 edac_mc_handle_ce_no_info(mci, "INTERNAL ERROR");
1668                 return;
1669         }
1670
1671         if (log_ce)
1672                 /* FIXME - put in DIMM location */
1673                 printk(KERN_WARNING
1674                        "EDAC MC%d: CE page 0x%lx, offset 0x%lx,"
1675                        " grain %d, syndrome 0x%lx, row %d, channel %d,"
1676                        " label \"%s\": %s\n", mci->mc_idx,
1677                        page_frame_number, offset_in_page,
1678                        mci->csrows[row].grain, syndrome, row, channel,
1679                        mci->csrows[row].channels[channel].label, msg);
1680
1681         mci->ce_count++;
1682         mci->csrows[row].ce_count++;
1683         mci->csrows[row].channels[channel].ce_count++;
1684
1685         if (mci->scrub_mode & SCRUB_SW_SRC) {
1686                 /*
1687                  * Some MC's can remap memory so that it is still available
1688                  * at a different address when PCI devices map into memory.
1689                  * MC's that can't do this lose the memory where PCI devices
1690                  * are mapped.  This mapping is MC dependant and so we call
1691                  * back into the MC driver for it to map the MC page to
1692                  * a physical (CPU) page which can then be mapped to a virtual
1693                  * page - which can then be scrubbed.
1694                  */
1695                 remapped_page = mci->ctl_page_to_phys ?
1696                     mci->ctl_page_to_phys(mci, page_frame_number) :
1697                     page_frame_number;
1698
1699                 edac_mc_scrub_block(remapped_page, offset_in_page,
1700                                          mci->csrows[row].grain);
1701         }
1702 }
1703
1704
1705 EXPORT_SYMBOL(edac_mc_handle_ce_no_info);
1706
1707 void edac_mc_handle_ce_no_info(struct mem_ctl_info *mci,
1708                                     const char *msg)
1709 {
1710         if (log_ce)
1711                 printk(KERN_WARNING
1712                        "EDAC MC%d: CE - no information available: %s\n",
1713                        mci->mc_idx, msg);
1714         mci->ce_noinfo_count++;
1715         mci->ce_count++;
1716 }
1717
1718
1719 EXPORT_SYMBOL(edac_mc_handle_ue);
1720
1721 void edac_mc_handle_ue(struct mem_ctl_info *mci,
1722                             unsigned long page_frame_number,
1723                             unsigned long offset_in_page, int row,
1724                             const char *msg)
1725 {
1726         int len = EDAC_MC_LABEL_LEN * 4;
1727         char labels[len + 1];
1728         char *pos = labels;
1729         int chan;
1730         int chars;
1731
1732         debugf3("MC%d: " __FILE__ ": %s()\n", mci->mc_idx, __func__);
1733
1734         /* FIXME - maybe make panic on INTERNAL ERROR an option */
1735         if (row >= mci->nr_csrows || row < 0) {
1736                 /* something is wrong */
1737                 printk(KERN_ERR
1738                        "EDAC MC%d: INTERNAL ERROR: row out of range (%d >= %d)\n",
1739                        mci->mc_idx, row, mci->nr_csrows);
1740                 edac_mc_handle_ue_no_info(mci, "INTERNAL ERROR");
1741                 return;
1742         }
1743
1744         chars = snprintf(pos, len + 1, "%s",
1745                          mci->csrows[row].channels[0].label);
1746         len -= chars;
1747         pos += chars;
1748         for (chan = 1; (chan < mci->csrows[row].nr_channels) && (len > 0);
1749              chan++) {
1750                 chars = snprintf(pos, len + 1, ":%s",
1751                                  mci->csrows[row].channels[chan].label);
1752                 len -= chars;
1753                 pos += chars;
1754         }
1755
1756         if (log_ue)
1757                 printk(KERN_EMERG
1758                        "EDAC MC%d: UE page 0x%lx, offset 0x%lx, grain %d, row %d,"
1759                        " labels \"%s\": %s\n", mci->mc_idx,
1760                        page_frame_number, offset_in_page,
1761                        mci->csrows[row].grain, row, labels, msg);
1762
1763         if (panic_on_ue)
1764                 panic
1765                     ("EDAC MC%d: UE page 0x%lx, offset 0x%lx, grain %d, row %d,"
1766                      " labels \"%s\": %s\n", mci->mc_idx,
1767                      page_frame_number, offset_in_page,
1768                      mci->csrows[row].grain, row, labels, msg);
1769
1770         mci->ue_count++;
1771         mci->csrows[row].ue_count++;
1772 }
1773
1774
1775 EXPORT_SYMBOL(edac_mc_handle_ue_no_info);
1776
1777 void edac_mc_handle_ue_no_info(struct mem_ctl_info *mci,
1778                                     const char *msg)
1779 {
1780         if (panic_on_ue)
1781                 panic("EDAC MC%d: Uncorrected Error", mci->mc_idx);
1782
1783         if (log_ue)
1784                 printk(KERN_WARNING
1785                        "EDAC MC%d: UE - no information available: %s\n",
1786                        mci->mc_idx, msg);
1787         mci->ue_noinfo_count++;
1788         mci->ue_count++;
1789 }
1790
1791
1792 #ifdef CONFIG_PCI
1793
1794 static u16 get_pci_parity_status(struct pci_dev *dev, int secondary)
1795 {
1796         int where;
1797         u16 status;
1798
1799         where = secondary ? PCI_SEC_STATUS : PCI_STATUS;
1800         pci_read_config_word(dev, where, &status);
1801
1802         /* If we get back 0xFFFF then we must suspect that the card has been pulled but
1803            the Linux PCI layer has not yet finished cleaning up. We don't want to report
1804            on such devices */
1805
1806         if (status == 0xFFFF) {
1807                 u32 sanity;
1808                 pci_read_config_dword(dev, 0, &sanity);
1809                 if (sanity == 0xFFFFFFFF)
1810                         return 0;
1811         }
1812         status &= PCI_STATUS_DETECTED_PARITY | PCI_STATUS_SIG_SYSTEM_ERROR |
1813                   PCI_STATUS_PARITY;
1814
1815         if (status)
1816                 /* reset only the bits we are interested in */
1817                 pci_write_config_word(dev, where, status);
1818
1819         return status;
1820 }
1821
1822 typedef void (*pci_parity_check_fn_t) (struct pci_dev *dev);
1823
1824 /* Clear any PCI parity errors logged by this device. */
1825 static void edac_pci_dev_parity_clear( struct pci_dev *dev )
1826 {
1827         u8 header_type;
1828
1829         get_pci_parity_status(dev, 0);
1830
1831         /* read the device TYPE, looking for bridges */
1832         pci_read_config_byte(dev, PCI_HEADER_TYPE, &header_type);
1833
1834         if ((header_type & 0x7F) == PCI_HEADER_TYPE_BRIDGE)
1835                 get_pci_parity_status(dev, 1);
1836 }
1837
1838 /*
1839  *  PCI Parity polling
1840  *
1841  */
1842 static void edac_pci_dev_parity_test(struct pci_dev *dev)
1843 {
1844         u16 status;
1845         u8  header_type;
1846
1847         /* read the STATUS register on this device
1848          */
1849         status = get_pci_parity_status(dev, 0);
1850
1851         debugf2("PCI STATUS= 0x%04x %s\n", status, dev->dev.bus_id );
1852
1853         /* check the status reg for errors */
1854         if (status) {
1855                 if (status & (PCI_STATUS_SIG_SYSTEM_ERROR))
1856                         printk(KERN_CRIT
1857                                 "EDAC PCI- "
1858                                 "Signaled System Error on %s\n",
1859                                 pci_name (dev));
1860
1861                 if (status & (PCI_STATUS_PARITY)) {
1862                         printk(KERN_CRIT
1863                                 "EDAC PCI- "
1864                                 "Master Data Parity Error on %s\n",
1865                                 pci_name (dev));
1866
1867                         atomic_inc(&pci_parity_count);
1868                 }
1869
1870                 if (status & (PCI_STATUS_DETECTED_PARITY)) {
1871                         printk(KERN_CRIT
1872                                 "EDAC PCI- "
1873                                 "Detected Parity Error on %s\n",
1874                                 pci_name (dev));
1875
1876                         atomic_inc(&pci_parity_count);
1877                 }
1878         }
1879
1880         /* read the device TYPE, looking for bridges */
1881         pci_read_config_byte(dev, PCI_HEADER_TYPE, &header_type);
1882
1883         debugf2("PCI HEADER TYPE= 0x%02x %s\n", header_type, dev->dev.bus_id );
1884
1885         if ((header_type & 0x7F) == PCI_HEADER_TYPE_BRIDGE) {
1886                 /* On bridges, need to examine secondary status register  */
1887                 status = get_pci_parity_status(dev, 1);
1888
1889                 debugf2("PCI SEC_STATUS= 0x%04x %s\n",
1890                                 status, dev->dev.bus_id );
1891
1892                 /* check the secondary status reg for errors */
1893                 if (status) {
1894                         if (status & (PCI_STATUS_SIG_SYSTEM_ERROR))
1895                                 printk(KERN_CRIT
1896                                         "EDAC PCI-Bridge- "
1897                                         "Signaled System Error on %s\n",
1898                                         pci_name (dev));
1899
1900                         if (status & (PCI_STATUS_PARITY)) {
1901                                 printk(KERN_CRIT
1902                                         "EDAC PCI-Bridge- "
1903                                         "Master Data Parity Error on %s\n",
1904                                         pci_name (dev));
1905
1906                                 atomic_inc(&pci_parity_count);
1907                         }
1908
1909                         if (status & (PCI_STATUS_DETECTED_PARITY)) {
1910                                 printk(KERN_CRIT
1911                                         "EDAC PCI-Bridge- "
1912                                         "Detected Parity Error on %s\n",
1913                                         pci_name (dev));
1914
1915                                 atomic_inc(&pci_parity_count);
1916                         }
1917                 }
1918         }
1919 }
1920
1921 /*
1922  * check_dev_on_list: Scan for a PCI device on a white/black list
1923  * @list:       an EDAC  &edac_pci_device_list  white/black list pointer
1924  * @free_index: index of next free entry on the list
1925  * @pci_dev:    PCI Device pointer
1926  *
1927  * see if list contains the device.
1928  *
1929  * Returns:     0 not found
1930  *              1 found on list
1931  */
1932 static int check_dev_on_list(struct edac_pci_device_list *list, int free_index,
1933                                 struct pci_dev *dev)
1934 {
1935         int i;
1936         int rc = 0;     /* Assume not found */
1937         unsigned short vendor=dev->vendor;
1938         unsigned short device=dev->device;
1939
1940         /* Scan the list, looking for a vendor/device match
1941          */
1942         for (i = 0; i < free_index; i++, list++ ) {
1943                 if (    (list->vendor == vendor ) &&
1944                         (list->device == device )) {
1945                         rc = 1;
1946                         break;
1947                 }
1948         }
1949
1950         return rc;
1951 }
1952
1953 /*
1954  * pci_dev parity list iterator
1955  *      Scan the PCI device list for one iteration, looking for SERRORs
1956  *      Master Parity ERRORS or Parity ERRORs on primary or secondary devices
1957  */
1958 static inline void edac_pci_dev_parity_iterator(pci_parity_check_fn_t fn)
1959 {
1960         struct pci_dev *dev=NULL;
1961
1962         /* request for kernel access to the next PCI device, if any,
1963          * and while we are looking at it have its reference count
1964          * bumped until we are done with it
1965          */
1966         while((dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev)) != NULL) {
1967
1968                 /* if whitelist exists then it has priority, so only scan those
1969                  * devices on the whitelist
1970                  */
1971                 if (pci_whitelist_count > 0 ) {
1972                         if (check_dev_on_list(pci_whitelist,
1973                                         pci_whitelist_count, dev))
1974                                 fn(dev);
1975                 } else {
1976                         /*
1977                          * if no whitelist, then check if this devices is
1978                          * blacklisted
1979                          */
1980                         if (!check_dev_on_list(pci_blacklist,
1981                                         pci_blacklist_count, dev))
1982                                 fn(dev);
1983                 }
1984         }
1985 }
1986
1987 static void do_pci_parity_check(void)
1988 {
1989         unsigned long flags;
1990         int before_count;
1991
1992         debugf3("MC: " __FILE__ ": %s()\n", __func__);
1993
1994         if (!check_pci_parity)
1995                 return;
1996
1997         before_count = atomic_read(&pci_parity_count);
1998
1999         /* scan all PCI devices looking for a Parity Error on devices and
2000          * bridges
2001          */
2002         local_irq_save(flags);
2003         edac_pci_dev_parity_iterator(edac_pci_dev_parity_test);
2004         local_irq_restore(flags);
2005
2006         /* Only if operator has selected panic on PCI Error */
2007         if (panic_on_pci_parity) {
2008                 /* If the count is different 'after' from 'before' */
2009                 if (before_count != atomic_read(&pci_parity_count))
2010                         panic("EDAC: PCI Parity Error");
2011         }
2012 }
2013
2014
2015 static inline void clear_pci_parity_errors(void)
2016 {
2017         /* Clear any PCI bus parity errors that devices initially have logged
2018          * in their registers.
2019          */
2020         edac_pci_dev_parity_iterator(edac_pci_dev_parity_clear);
2021 }
2022
2023
2024 #else  /* CONFIG_PCI */
2025
2026
2027 static inline void do_pci_parity_check(void)
2028 {
2029         /* no-op */
2030 }
2031
2032
2033 static inline void clear_pci_parity_errors(void)
2034 {
2035         /* no-op */
2036 }
2037
2038
2039 #endif  /* CONFIG_PCI */
2040
2041 /*
2042  * Iterate over all MC instances and check for ECC, et al, errors
2043  */
2044 static inline void check_mc_devices (void)
2045 {
2046         unsigned long flags;
2047         struct list_head *item;
2048         struct mem_ctl_info *mci;
2049
2050         debugf3("MC: " __FILE__ ": %s()\n", __func__);
2051
2052         /* during poll, have interrupts off */
2053         local_irq_save(flags);
2054
2055         list_for_each(item, &mc_devices) {
2056                 mci = list_entry(item, struct mem_ctl_info, link);
2057
2058                 if (mci->edac_check != NULL)
2059                         mci->edac_check(mci);
2060         }
2061
2062         local_irq_restore(flags);
2063 }
2064
2065
2066 /*
2067  * Check MC status every poll_msec.
2068  * Check PCI status every poll_msec as well.
2069  *
2070  * This where the work gets done for edac.
2071  *
2072  * SMP safe, doesn't use NMI, and auto-rate-limits.
2073  */
2074 static void do_edac_check(void)
2075 {
2076
2077         debugf3("MC: " __FILE__ ": %s()\n", __func__);
2078
2079         check_mc_devices();
2080
2081         do_pci_parity_check();
2082 }
2083
2084
2085 /*
2086  * EDAC thread state information
2087  */
2088 struct bs_thread_info
2089 {
2090         struct task_struct *task;
2091         struct completion *event;
2092         char *name;
2093         void (*run)(void);
2094 };
2095
2096 static struct bs_thread_info bs_thread;
2097
2098 /*
2099  *  edac_kernel_thread
2100  *      This the kernel thread that processes edac operations
2101  *      in a normal thread environment
2102  */
2103 static int edac_kernel_thread(void *arg)
2104 {
2105         struct bs_thread_info *thread = (struct bs_thread_info *) arg;
2106
2107         /* detach thread */
2108         daemonize(thread->name);
2109
2110         current->exit_signal = SIGCHLD;
2111         allow_signal(SIGKILL);
2112         thread->task = current;
2113
2114         /* indicate to starting task we have started */
2115         complete(thread->event);
2116
2117         /* loop forever, until we are told to stop */
2118         while(thread->run != NULL) {
2119                 void (*run)(void);
2120
2121                 /* call the function to check the memory controllers */
2122                 run = thread->run;
2123                 if (run)
2124                         run();
2125
2126                 if (signal_pending(current))
2127                         flush_signals(current);
2128
2129                 /* ensure we are interruptable */
2130                 set_current_state(TASK_INTERRUPTIBLE);
2131
2132                 /* goto sleep for the interval */
2133                 schedule_timeout((HZ * poll_msec) / 1000);
2134                 try_to_freeze();
2135         }
2136
2137         /* notify waiter that we are exiting */
2138         complete(thread->event);
2139
2140         return 0;
2141 }
2142
2143 /*
2144  * edac_mc_init
2145  *      module initialization entry point
2146  */
2147 static int __init edac_mc_init(void)
2148 {
2149         int ret;
2150         struct completion event;
2151
2152         printk(KERN_INFO "MC: " __FILE__ " version " EDAC_MC_VERSION "\n");
2153
2154         /*
2155          * Harvest and clear any boot/initialization PCI parity errors
2156          *
2157          * FIXME: This only clears errors logged by devices present at time of
2158          *      module initialization.  We should also do an initial clear
2159          *      of each newly hotplugged device.
2160          */
2161         clear_pci_parity_errors();
2162
2163         /* perform check for first time to harvest boot leftovers */
2164         do_edac_check();
2165
2166         /* Create the MC sysfs entires */
2167         if (edac_sysfs_memctrl_setup()) {
2168                 printk(KERN_ERR "EDAC MC: Error initializing sysfs code\n");
2169                 return -ENODEV;
2170         }
2171
2172         /* Create the PCI parity sysfs entries */
2173         if (edac_sysfs_pci_setup()) {
2174                 edac_sysfs_memctrl_teardown();
2175                 printk(KERN_ERR "EDAC PCI: Error initializing sysfs code\n");
2176                 return -ENODEV;
2177         }
2178
2179         /* Create our kernel thread */
2180         init_completion(&event);
2181         bs_thread.event = &event;
2182         bs_thread.name = "kedac";
2183         bs_thread.run = do_edac_check;
2184
2185         /* create our kernel thread */
2186         ret = kernel_thread(edac_kernel_thread, &bs_thread, CLONE_KERNEL);
2187         if (ret < 0) {
2188                 /* remove the sysfs entries */
2189                 edac_sysfs_memctrl_teardown();
2190                 edac_sysfs_pci_teardown();
2191                 return -ENOMEM;
2192         }
2193
2194         /* wait for our kernel theard ack that it is up and running */
2195         wait_for_completion(&event);
2196
2197         return 0;
2198 }
2199
2200
2201 /*
2202  * edac_mc_exit()
2203  *      module exit/termination functioni
2204  */
2205 static void __exit edac_mc_exit(void)
2206 {
2207         struct completion event;
2208
2209         debugf0("MC: " __FILE__ ": %s()\n", __func__);
2210
2211         init_completion(&event);
2212         bs_thread.event = &event;
2213
2214         /* As soon as ->run is set to NULL, the task could disappear,
2215          * so we need to hold tasklist_lock until we have sent the signal
2216          */
2217         read_lock(&tasklist_lock);
2218         bs_thread.run = NULL;
2219         send_sig(SIGKILL, bs_thread.task, 1);
2220         read_unlock(&tasklist_lock);
2221         wait_for_completion(&event);
2222
2223         /* tear down the sysfs device */
2224         edac_sysfs_memctrl_teardown();
2225         edac_sysfs_pci_teardown();
2226 }
2227
2228
2229
2230
2231 module_init(edac_mc_init);
2232 module_exit(edac_mc_exit);
2233
2234 MODULE_LICENSE("GPL");
2235 MODULE_AUTHOR("Linux Networx (http://lnxi.com) Thayne Harbaugh et al\n"
2236               "Based on.work by Dan Hollis et al");
2237 MODULE_DESCRIPTION("Core library routines for MC reporting");
2238
2239 module_param(panic_on_ue, int, 0644);
2240 MODULE_PARM_DESC(panic_on_ue, "Panic on uncorrected error: 0=off 1=on");
2241 module_param(check_pci_parity, int, 0644);
2242 MODULE_PARM_DESC(check_pci_parity, "Check for PCI bus parity errors: 0=off 1=on");
2243 module_param(panic_on_pci_parity, int, 0644);
2244 MODULE_PARM_DESC(panic_on_pci_parity, "Panic on PCI Bus Parity error: 0=off 1=on");
2245 module_param(log_ue, int, 0644);
2246 MODULE_PARM_DESC(log_ue, "Log uncorrectable error to console: 0=off 1=on");
2247 module_param(log_ce, int, 0644);
2248 MODULE_PARM_DESC(log_ce, "Log correctable error to console: 0=off 1=on");
2249 module_param(poll_msec, int, 0644);
2250 MODULE_PARM_DESC(poll_msec, "Polling period in milliseconds");
2251 #ifdef CONFIG_EDAC_DEBUG
2252 module_param(edac_debug_level, int, 0644);
2253 MODULE_PARM_DESC(edac_debug_level, "Debug level");
2254 #endif