drivers/edac/edac_mc.c

   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 #include <linux/config.h>
  16 #include <linux/module.h>
  17 #include <linux/proc_fs.h>
  18 #include <linux/kernel.h>
  19 #include <linux/types.h>
  20 #include <linux/smp.h>
  21 #include <linux/init.h>
  22 #include <linux/sysctl.h>
  23 #include <linux/highmem.h>
  24 #include <linux/timer.h>
  25 #include <linux/slab.h>
  26 #include <linux/jiffies.h>
  27 #include <linux/spinlock.h>
  28 #include <linux/list.h>
  29 #include <linux/sysdev.h>
  30 #include <linux/ctype.h>
  31 #include <linux/kthread.h>
  32 #include <asm/uaccess.h>
  33 #include <asm/page.h>
  34 #include <asm/edac.h>
  35 #include "edac_mc.h"
  36
  37 #define EDAC_MC_VERSION "Ver: 2.0.0 " __DATE__
  38
  39 /* For now, disable the EDAC sysfs code.  The sysfs interface that EDAC
  40  * presents to user space needs more thought, and is likely to change
  41  * substantially.
  42  */
  43 #define DISABLE_EDAC_SYSFS
  44
  45 #ifdef CONFIG_EDAC_DEBUG
  46 /* Values of 0 to 4 will generate output */
  47 int edac_debug_level = 1;
  48 EXPORT_SYMBOL_GPL(edac_debug_level);
  49 #endif
  50
  51 /* EDAC Controls, setable by module parameter, and sysfs */
  52 static int log_ue = 1;
  53 static int log_ce = 1;
  54 static int panic_on_ue;
  55 static int poll_msec = 1000;
  56
  57 static int check_pci_parity = 0;        /* default YES check PCI parity */
  58 static int panic_on_pci_parity;         /* default no panic on PCI Parity */
  59 static atomic_t pci_parity_count = ATOMIC_INIT(0);
  60
  61 /* lock to memory controller's control array */
  62 static DECLARE_MUTEX(mem_ctls_mutex);
  63 static struct list_head mc_devices = LIST_HEAD_INIT(mc_devices);
  64
  65 static struct task_struct *edac_thread;
  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 #define MAX_LISTED_PCI_DEVICES          32
  74
  75 /* List of PCI devices (vendor-id:device-id) that should be skipped */
  76 static struct edac_pci_device_list pci_blacklist[MAX_LISTED_PCI_DEVICES];
  77 static int pci_blacklist_count;
  78
  79 /* List of PCI devices (vendor-id:device-id) that should be scanned */
  80 static struct edac_pci_device_list pci_whitelist[MAX_LISTED_PCI_DEVICES];
  81 static int pci_whitelist_count ;
  82
  83 /*  START sysfs data and methods */
  84
  85 #ifndef DISABLE_EDAC_SYSFS
  86
  87 static const char *mem_types[] = {
  88         [MEM_EMPTY] = "Empty",
  89         [MEM_RESERVED] = "Reserved",
  90         [MEM_UNKNOWN] = "Unknown",
  91         [MEM_FPM] = "FPM",
  92         [MEM_EDO] = "EDO",
  93         [MEM_BEDO] = "BEDO",
  94         [MEM_SDR] = "Unbuffered-SDR",
  95         [MEM_RDR] = "Registered-SDR",
  96         [MEM_DDR] = "Unbuffered-DDR",
  97         [MEM_RDDR] = "Registered-DDR",
  98         [MEM_RMBS] = "RMBS"
  99 };
 100
 101 static const char *dev_types[] = {
 102         [DEV_UNKNOWN] = "Unknown",
 103         [DEV_X1] = "x1",
 104         [DEV_X2] = "x2",
 105         [DEV_X4] = "x4",
 106         [DEV_X8] = "x8",
 107         [DEV_X16] = "x16",
 108         [DEV_X32] = "x32",
 109         [DEV_X64] = "x64"
 110 };
 111
 112 static const char *edac_caps[] = {
 113         [EDAC_UNKNOWN] = "Unknown",
 114         [EDAC_NONE] = "None",
 115         [EDAC_RESERVED] = "Reserved",
 116         [EDAC_PARITY] = "PARITY",
 117         [EDAC_EC] = "EC",
 118         [EDAC_SECDED] = "SECDED",
 119         [EDAC_S2ECD2ED] = "S2ECD2ED",
 120         [EDAC_S4ECD4ED] = "S4ECD4ED",
 121         [EDAC_S8ECD8ED] = "S8ECD8ED",
 122         [EDAC_S16ECD16ED] = "S16ECD16ED"
 123 };
 124
 125 /* sysfs object: /sys/devices/system/edac */
 126 static struct sysdev_class edac_class = {
 127         set_kset_name("edac"),
 128 };
 129
 130 /* sysfs objects:
 131  *      /sys/devices/system/edac/mc
 132  *      /sys/devices/system/edac/pci
 133  */
 134 static struct kobject edac_memctrl_kobj;
 135 static struct kobject edac_pci_kobj;
 136
 137 /* We use these to wait for the reference counts on edac_memctrl_kobj and
 138  * edac_pci_kobj to reach 0.
 139  */
 140 static struct completion edac_memctrl_kobj_complete;
 141 static struct completion edac_pci_kobj_complete;
 142
 143 /*
 144  * /sys/devices/system/edac/mc;
 145  *      data structures and methods
 146  */
 147 #if 0
 148 static ssize_t memctrl_string_show(void *ptr, char *buffer)
 149 {
 150         char *value = (char*) ptr;
 151         return sprintf(buffer, "%s\n", value);
 152 }
 153 #endif
 154
 155 static ssize_t memctrl_int_show(void *ptr, char *buffer)
 156 {
 157         int *value = (int*) ptr;
 158         return sprintf(buffer, "%d\n", *value);
 159 }
 160
 161 static ssize_t memctrl_int_store(void *ptr, const char *buffer, size_t count)
 162 {
 163         int *value = (int*) ptr;
 164
 165         if (isdigit(*buffer))
 166                 *value = simple_strtoul(buffer, NULL, 0);
 167
 168         return count;
 169 }
 170
 171 struct memctrl_dev_attribute {
 172         struct attribute attr;
 173         void *value;
 174         ssize_t (*show)(void *,char *);
 175         ssize_t (*store)(void *, const char *, size_t);
 176 };
 177
 178 /* Set of show/store abstract level functions for memory control object */
 179 static ssize_t memctrl_dev_show(struct kobject *kobj,
 180                 struct attribute *attr, char *buffer)
 181 {
 182         struct memctrl_dev_attribute *memctrl_dev;
 183         memctrl_dev = (struct memctrl_dev_attribute*)attr;
 184
 185         if (memctrl_dev->show)
 186                 return memctrl_dev->show(memctrl_dev->value, buffer);
 187
 188         return -EIO;
 189 }
 190
 191 static ssize_t memctrl_dev_store(struct kobject *kobj, struct attribute *attr,
 192                 const char *buffer, size_t count)
 193 {
 194         struct memctrl_dev_attribute *memctrl_dev;
 195         memctrl_dev = (struct memctrl_dev_attribute*)attr;
 196
 197         if (memctrl_dev->store)
 198                 return memctrl_dev->store(memctrl_dev->value, buffer, count);
 199
 200         return -EIO;
 201 }
 202
 203 static struct sysfs_ops memctrlfs_ops = {
 204         .show   = memctrl_dev_show,
 205         .store  = memctrl_dev_store
 206 };
 207
 208 #define MEMCTRL_ATTR(_name,_mode,_show,_store)                  \
 209 struct memctrl_dev_attribute attr_##_name = {                   \
 210         .attr = {.name = __stringify(_name), .mode = _mode },   \
 211         .value  = &_name,                                       \
 212         .show   = _show,                                        \
 213         .store  = _store,                                       \
 214 };
 215
 216 #define MEMCTRL_STRING_ATTR(_name,_data,_mode,_show,_store)     \
 217 struct memctrl_dev_attribute attr_##_name = {                   \
 218         .attr = {.name = __stringify(_name), .mode = _mode },   \
 219         .value  = _data,                                        \
 220         .show   = _show,                                        \
 221         .store  = _store,                                       \
 222 };
 223
 224 /* cwrow<id> attribute f*/
 225 #if 0
 226 MEMCTRL_STRING_ATTR(mc_version,EDAC_MC_VERSION,S_IRUGO,memctrl_string_show,NULL);
 227 #endif
 228
 229 /* csrow<id> control files */
 230 MEMCTRL_ATTR(panic_on_ue,S_IRUGO|S_IWUSR,memctrl_int_show,memctrl_int_store);
 231 MEMCTRL_ATTR(log_ue,S_IRUGO|S_IWUSR,memctrl_int_show,memctrl_int_store);
 232 MEMCTRL_ATTR(log_ce,S_IRUGO|S_IWUSR,memctrl_int_show,memctrl_int_store);
 233 MEMCTRL_ATTR(poll_msec,S_IRUGO|S_IWUSR,memctrl_int_show,memctrl_int_store);
 234
 235 /* Base Attributes of the memory ECC object */
 236 static struct memctrl_dev_attribute *memctrl_attr[] = {
 237         &attr_panic_on_ue,
 238         &attr_log_ue,
 239         &attr_log_ce,
 240         &attr_poll_msec,
 241         NULL,
 242 };
 243
 244 /* Main MC kobject release() function */
 245 static void edac_memctrl_master_release(struct kobject *kobj)
 246 {
 247         debugf1("%s()\n", __func__);
 248         complete(&edac_memctrl_kobj_complete);
 249 }
 250
 251 static struct kobj_type ktype_memctrl = {
 252         .release = edac_memctrl_master_release,
 253         .sysfs_ops = &memctrlfs_ops,
 254         .default_attrs = (struct attribute **) memctrl_attr,
 255 };
 256
 257 #endif  /* DISABLE_EDAC_SYSFS */
 258
 259 /* Initialize the main sysfs entries for edac:
 260  *   /sys/devices/system/edac
 261  *
 262  * and children
 263  *
 264  * Return:  0 SUCCESS
 265  *         !0 FAILURE
 266  */
 267 static int edac_sysfs_memctrl_setup(void)
 268 #ifdef DISABLE_EDAC_SYSFS
 269 {
 270         return 0;
 271 }
 272 #else
 273 {
 274         int err=0;
 275
 276         debugf1("%s()\n", __func__);
 277
 278         /* create the /sys/devices/system/edac directory */
 279         err = sysdev_class_register(&edac_class);
 280
 281         if (!err) {
 282                 /* Init the MC's kobject */
 283                 memset(&edac_memctrl_kobj, 0, sizeof (edac_memctrl_kobj));
 284                 edac_memctrl_kobj.parent = &edac_class.kset.kobj;
 285                 edac_memctrl_kobj.ktype = &ktype_memctrl;
 286
 287                 /* generate sysfs "..../edac/mc"   */
 288                 err = kobject_set_name(&edac_memctrl_kobj,"mc");
 289
 290                 if (!err) {
 291                         /* FIXME: maybe new sysdev_create_subdir() */
 292                         err = kobject_register(&edac_memctrl_kobj);
 293
 294                         if (err)
 295                                 debugf1("Failed to register '.../edac/mc'\n");
 296                         else
 297                                 debugf1("Registered '.../edac/mc' kobject\n");
 298                 }
 299         } else
 300                 debugf1("%s() error=%d\n", __func__, err);
 301
 302         return err;
 303 }
 304 #endif  /* DISABLE_EDAC_SYSFS */
 305
 306 /*
 307  * MC teardown:
 308  *      the '..../edac/mc' kobject followed by '..../edac' itself
 309  */
 310 static void edac_sysfs_memctrl_teardown(void)
 311 {
 312 #ifndef DISABLE_EDAC_SYSFS
 313         debugf0("MC: " __FILE__ ": %s()\n", __func__);
 314
 315         /* Unregister the MC's kobject and wait for reference count to reach
 316          * 0.
 317          */
 318         init_completion(&edac_memctrl_kobj_complete);
 319         kobject_unregister(&edac_memctrl_kobj);
 320         wait_for_completion(&edac_memctrl_kobj_complete);
 321
 322         /* Unregister the 'edac' object */
 323         sysdev_class_unregister(&edac_class);
 324 #endif  /* DISABLE_EDAC_SYSFS */
 325 }
 326
 327 #ifndef DISABLE_EDAC_SYSFS
 328
 329 /*
 330  * /sys/devices/system/edac/pci;
 331  *      data structures and methods
 332  */
 333
 334 struct list_control {
 335         struct edac_pci_device_list *list;
 336         int *count;
 337 };
 338
 339 #if 0
 340 /* Output the list as:  vendor_id:device:id<,vendor_id:device_id> */
 341 static ssize_t edac_pci_list_string_show(void *ptr, char *buffer)
 342 {
 343         struct list_control *listctl;
 344         struct edac_pci_device_list *list;
 345         char *p = buffer;
 346         int len=0;
 347         int i;
 348
 349         listctl = ptr;
 350         list = listctl->list;
 351
 352         for (i = 0; i < *(listctl->count); i++, list++ ) {
 353                 if (len > 0)
 354                         len += snprintf(p + len, (PAGE_SIZE-len), ",");
 355
 356                 len += snprintf(p + len,
 357                                 (PAGE_SIZE-len),
 358                                 "%x:%x",
 359                                 list->vendor,list->device);
 360         }
 361
 362         len += snprintf(p + len,(PAGE_SIZE-len), "\n");
 363         return (ssize_t) len;
 364 }
 365
 366 /**
 367  *
 368  * Scan string from **s to **e looking for one 'vendor:device' tuple
 369  * where each field is a hex value
 370  *
 371  * return 0 if an entry is NOT found
 372  * return 1 if an entry is found
 373  *      fill in *vendor_id and *device_id with values found
 374  *
 375  * In both cases, make sure *s has been moved forward toward *e
 376  */
 377 static int parse_one_device(const char **s,const char **e,
 378         unsigned int *vendor_id, unsigned int *device_id)
 379 {
 380         const char *runner, *p;
 381
 382         /* if null byte, we are done */
 383         if (!**s) {
 384                 (*s)++;  /* keep *s moving */
 385                 return 0;
 386         }
 387
 388         /* skip over newlines & whitespace */
 389         if ((**s == '\n') || isspace(**s)) {
 390                 (*s)++;
 391                 return 0;
 392         }
 393
 394         if (!isxdigit(**s)) {
 395                 (*s)++;
 396                 return 0;
 397         }
 398
 399         /* parse vendor_id */
 400         runner = *s;
 401
 402         while (runner < *e) {
 403                 /* scan for vendor:device delimiter */
 404                 if (*runner == ':') {
 405                         *vendor_id = simple_strtol((char*) *s, (char**) &p, 16);
 406                         runner = p + 1;
 407                         break;
 408                 }
 409
 410                 runner++;
 411         }
 412
 413         if (!isxdigit(*runner)) {
 414                 *s = ++runner;
 415                 return 0;
 416         }
 417
 418         /* parse device_id */
 419         if (runner < *e) {
 420                 *device_id = simple_strtol((char*)runner, (char**)&p, 16);
 421                 runner = p;
 422         }
 423
 424         *s = runner;
 425         return 1;
 426 }
 427
 428 static ssize_t edac_pci_list_string_store(void *ptr, const char *buffer,
 429                 size_t count)
 430 {
 431         struct list_control *listctl;
 432         struct edac_pci_device_list *list;
 433         unsigned int vendor_id, device_id;
 434         const char *s, *e;
 435         int *index;
 436
 437         s = (char*)buffer;
 438         e = s + count;
 439         listctl = ptr;
 440         list = listctl->list;
 441         index = listctl->count;
 442         *index = 0;
 443
 444         while (*index < MAX_LISTED_PCI_DEVICES) {
 445                 if (parse_one_device(&s,&e,&vendor_id,&device_id)) {
 446                         list[ *index ].vendor = vendor_id;
 447                         list[ *index ].device = device_id;
 448                         (*index)++;
 449                 }
 450
 451                 /* check for all data consume */
 452                 if (s >= e)
 453                         break;
 454         }
 455
 456         return count;
 457 }
 458
 459 #endif
 460 static ssize_t edac_pci_int_show(void *ptr, char *buffer)
 461 {
 462         int *value = ptr;
 463         return sprintf(buffer,"%d\n",*value);
 464 }
 465
 466 static ssize_t edac_pci_int_store(void *ptr, const char *buffer, size_t count)
 467 {
 468         int *value = ptr;
 469
 470         if (isdigit(*buffer))
 471                 *value = simple_strtoul(buffer,NULL,0);
 472
 473         return count;
 474 }
 475
 476 struct edac_pci_dev_attribute {
 477         struct attribute attr;
 478         void *value;
 479         ssize_t (*show)(void *,char *);
 480         ssize_t (*store)(void *, const char *,size_t);
 481 };
 482
 483 /* Set of show/store abstract level functions for PCI Parity object */
 484 static ssize_t edac_pci_dev_show(struct kobject *kobj, struct attribute *attr,
 485                 char *buffer)
 486 {
 487         struct edac_pci_dev_attribute *edac_pci_dev;
 488         edac_pci_dev= (struct edac_pci_dev_attribute*)attr;
 489
 490         if (edac_pci_dev->show)
 491                 return edac_pci_dev->show(edac_pci_dev->value, buffer);
 492         return -EIO;
 493 }
 494
 495 static ssize_t edac_pci_dev_store(struct kobject *kobj,
 496                 struct attribute *attr, const char *buffer, size_t count)
 497 {
 498         struct edac_pci_dev_attribute *edac_pci_dev;
 499         edac_pci_dev= (struct edac_pci_dev_attribute*)attr;
 500
 501         if (edac_pci_dev->show)
 502                 return edac_pci_dev->store(edac_pci_dev->value, buffer, count);
 503         return -EIO;
 504 }
 505
 506 static struct sysfs_ops edac_pci_sysfs_ops = {
 507         .show   = edac_pci_dev_show,
 508         .store  = edac_pci_dev_store
 509 };
 510
 511 #define EDAC_PCI_ATTR(_name,_mode,_show,_store)                 \
 512 struct edac_pci_dev_attribute edac_pci_attr_##_name = {         \
 513         .attr = {.name = __stringify(_name), .mode = _mode },   \
 514         .value  = &_name,                                       \
 515         .show   = _show,                                        \
 516         .store  = _store,                                       \
 517 };
 518
 519 #define EDAC_PCI_STRING_ATTR(_name,_data,_mode,_show,_store)    \
 520 struct edac_pci_dev_attribute edac_pci_attr_##_name = {         \
 521         .attr = {.name = __stringify(_name), .mode = _mode },   \
 522         .value  = _data,                                        \
 523         .show   = _show,                                        \
 524         .store  = _store,                                       \
 525 };
 526
 527 #if 0
 528 static struct list_control pci_whitelist_control = {
 529         .list = pci_whitelist,
 530         .count = &pci_whitelist_count
 531 };
 532
 533 static struct list_control pci_blacklist_control = {
 534         .list = pci_blacklist,
 535         .count = &pci_blacklist_count
 536 };
 537
 538 /* whitelist attribute */
 539 EDAC_PCI_STRING_ATTR(pci_parity_whitelist,
 540         &pci_whitelist_control,
 541         S_IRUGO|S_IWUSR,
 542         edac_pci_list_string_show,
 543         edac_pci_list_string_store);
 544
 545 EDAC_PCI_STRING_ATTR(pci_parity_blacklist,
 546         &pci_blacklist_control,
 547         S_IRUGO|S_IWUSR,
 548         edac_pci_list_string_show,
 549         edac_pci_list_string_store);
 550 #endif
 551
 552 /* PCI Parity control files */
 553 EDAC_PCI_ATTR(check_pci_parity, S_IRUGO|S_IWUSR, edac_pci_int_show,
 554         edac_pci_int_store);
 555 EDAC_PCI_ATTR(panic_on_pci_parity, S_IRUGO|S_IWUSR, edac_pci_int_show,
 556         edac_pci_int_store);
 557 EDAC_PCI_ATTR(pci_parity_count, S_IRUGO, edac_pci_int_show, NULL);
 558
 559 /* Base Attributes of the memory ECC object */
 560 static struct edac_pci_dev_attribute *edac_pci_attr[] = {
 561         &edac_pci_attr_check_pci_parity,
 562         &edac_pci_attr_panic_on_pci_parity,
 563         &edac_pci_attr_pci_parity_count,
 564         NULL,
 565 };
 566
 567 /* No memory to release */
 568 static void edac_pci_release(struct kobject *kobj)
 569 {
 570         debugf1("%s()\n", __func__);
 571         complete(&edac_pci_kobj_complete);
 572 }
 573
 574 static struct kobj_type ktype_edac_pci = {
 575         .release = edac_pci_release,
 576         .sysfs_ops = &edac_pci_sysfs_ops,
 577         .default_attrs = (struct attribute **) edac_pci_attr,
 578 };
 579
 580 #endif  /* DISABLE_EDAC_SYSFS */
 581
 582 /**
 583  * edac_sysfs_pci_setup()
 584  *
 585  */
 586 static int edac_sysfs_pci_setup(void)
 587 #ifdef DISABLE_EDAC_SYSFS
 588 {
 589         return 0;
 590 }
 591 #else
 592 {
 593         int err;
 594
 595         debugf1("%s()\n", __func__);
 596
 597         memset(&edac_pci_kobj, 0, sizeof(edac_pci_kobj));
 598         edac_pci_kobj.parent = &edac_class.kset.kobj;
 599         edac_pci_kobj.ktype = &ktype_edac_pci;
 600         err = kobject_set_name(&edac_pci_kobj, "pci");
 601
 602         if (!err) {
 603                 /* Instanstiate the csrow object */
 604                 /* FIXME: maybe new sysdev_create_subdir() */
 605                 err = kobject_register(&edac_pci_kobj);
 606
 607                 if (err)
 608                         debugf1("Failed to register '.../edac/pci'\n");
 609                 else
 610                         debugf1("Registered '.../edac/pci' kobject\n");
 611         }
 612
 613         return err;
 614 }
 615 #endif  /* DISABLE_EDAC_SYSFS */
 616
 617 static void edac_sysfs_pci_teardown(void)
 618 {
 619 #ifndef DISABLE_EDAC_SYSFS
 620         debugf0("%s()\n", __func__);
 621         init_completion(&edac_pci_kobj_complete);
 622         kobject_unregister(&edac_pci_kobj);
 623         wait_for_completion(&edac_pci_kobj_complete);
 624 #endif
 625 }
 626
 627 #ifndef DISABLE_EDAC_SYSFS
 628
 629 /* EDAC sysfs CSROW data structures and methods */
 630
 631 /* Set of more detailed csrow<id> attribute show/store functions */
 632 static ssize_t csrow_ch0_dimm_label_show(struct csrow_info *csrow, char *data)
 633 {
 634         ssize_t size = 0;
 635
 636         if (csrow->nr_channels > 0) {
 637                 size = snprintf(data, EDAC_MC_LABEL_LEN,"%s\n",
 638                         csrow->channels[0].label);
 639         }
 640
 641         return size;
 642 }
 643
 644 static ssize_t csrow_ch1_dimm_label_show(struct csrow_info *csrow, char *data)
 645 {
 646         ssize_t size = 0;
 647
 648         if (csrow->nr_channels > 0) {
 649                 size = snprintf(data, EDAC_MC_LABEL_LEN, "%s\n",
 650                         csrow->channels[1].label);
 651         }
 652
 653         return size;
 654 }
 655
 656 static ssize_t csrow_ch0_dimm_label_store(struct csrow_info *csrow,
 657                 const char *data, size_t size)
 658 {
 659         ssize_t max_size = 0;
 660
 661         if (csrow->nr_channels > 0) {
 662                 max_size = min((ssize_t)size,(ssize_t)EDAC_MC_LABEL_LEN-1);
 663                 strncpy(csrow->channels[0].label, data, max_size);
 664                 csrow->channels[0].label[max_size] = '\0';
 665         }
 666
 667         return size;
 668 }
 669
 670 static ssize_t csrow_ch1_dimm_label_store(struct csrow_info *csrow,
 671                 const char *data, size_t size)
 672 {
 673         ssize_t max_size = 0;
 674
 675         if (csrow->nr_channels > 1) {
 676                 max_size = min((ssize_t)size,(ssize_t)EDAC_MC_LABEL_LEN-1);
 677                 strncpy(csrow->channels[1].label, data, max_size);
 678                 csrow->channels[1].label[max_size] = '\0';
 679         }
 680
 681         return max_size;
 682 }
 683
 684 static ssize_t csrow_ue_count_show(struct csrow_info *csrow, char *data)
 685 {
 686         return sprintf(data,"%u\n", csrow->ue_count);
 687 }
 688
 689 static ssize_t csrow_ce_count_show(struct csrow_info *csrow, char *data)
 690 {
 691         return sprintf(data,"%u\n", csrow->ce_count);
 692 }
 693
 694 static ssize_t csrow_ch0_ce_count_show(struct csrow_info *csrow, char *data)
 695 {
 696         ssize_t size = 0;
 697
 698         if (csrow->nr_channels > 0) {
 699                 size = sprintf(data,"%u\n", csrow->channels[0].ce_count);
 700         }
 701
 702         return size;
 703 }
 704
 705 static ssize_t csrow_ch1_ce_count_show(struct csrow_info *csrow, char *data)
 706 {
 707         ssize_t size = 0;
 708
 709         if (csrow->nr_channels > 1) {
 710                 size = sprintf(data,"%u\n", csrow->channels[1].ce_count);
 711         }
 712
 713         return size;
 714 }
 715
 716 static ssize_t csrow_size_show(struct csrow_info *csrow, char *data)
 717 {
 718         return sprintf(data,"%u\n", PAGES_TO_MiB(csrow->nr_pages));
 719 }
 720
 721 static ssize_t csrow_mem_type_show(struct csrow_info *csrow, char *data)
 722 {
 723         return sprintf(data,"%s\n", mem_types[csrow->mtype]);
 724 }
 725
 726 static ssize_t csrow_dev_type_show(struct csrow_info *csrow, char *data)
 727 {
 728         return sprintf(data,"%s\n", dev_types[csrow->dtype]);
 729 }
 730
 731 static ssize_t csrow_edac_mode_show(struct csrow_info *csrow, char *data)
 732 {
 733         return sprintf(data,"%s\n", edac_caps[csrow->edac_mode]);
 734 }
 735
 736 struct csrowdev_attribute {
 737         struct attribute attr;
 738         ssize_t (*show)(struct csrow_info *,char *);
 739         ssize_t (*store)(struct csrow_info *, const char *,size_t);
 740 };
 741
 742 #define to_csrow(k) container_of(k, struct csrow_info, kobj)
 743 #define to_csrowdev_attr(a) container_of(a, struct csrowdev_attribute, attr)
 744
 745 /* Set of show/store higher level functions for csrow objects */
 746 static ssize_t csrowdev_show(struct kobject *kobj, struct attribute *attr,
 747                 char *buffer)
 748 {
 749         struct csrow_info *csrow = to_csrow(kobj);
 750         struct csrowdev_attribute *csrowdev_attr = to_csrowdev_attr(attr);
 751
 752         if (csrowdev_attr->show)
 753                 return csrowdev_attr->show(csrow, buffer);
 754
 755         return -EIO;
 756 }
 757
 758 static ssize_t csrowdev_store(struct kobject *kobj, struct attribute *attr,
 759                 const char *buffer, size_t count)
 760 {
 761         struct csrow_info *csrow = to_csrow(kobj);
 762         struct csrowdev_attribute * csrowdev_attr = to_csrowdev_attr(attr);
 763
 764         if (csrowdev_attr->store)
 765                 return csrowdev_attr->store(csrow, buffer, count);
 766
 767         return -EIO;
 768 }
 769
 770 static struct sysfs_ops csrowfs_ops = {
 771         .show   = csrowdev_show,
 772         .store  = csrowdev_store
 773 };
 774
 775 #define CSROWDEV_ATTR(_name,_mode,_show,_store)                 \
 776 struct csrowdev_attribute attr_##_name = {                      \
 777         .attr = {.name = __stringify(_name), .mode = _mode },   \
 778         .show   = _show,                                        \
 779         .store  = _store,                                       \
 780 };
 781
 782 /* cwrow<id>/attribute files */
 783 CSROWDEV_ATTR(size_mb,S_IRUGO,csrow_size_show,NULL);
 784 CSROWDEV_ATTR(dev_type,S_IRUGO,csrow_dev_type_show,NULL);
 785 CSROWDEV_ATTR(mem_type,S_IRUGO,csrow_mem_type_show,NULL);
 786 CSROWDEV_ATTR(edac_mode,S_IRUGO,csrow_edac_mode_show,NULL);
 787 CSROWDEV_ATTR(ue_count,S_IRUGO,csrow_ue_count_show,NULL);
 788 CSROWDEV_ATTR(ce_count,S_IRUGO,csrow_ce_count_show,NULL);
 789 CSROWDEV_ATTR(ch0_ce_count,S_IRUGO,csrow_ch0_ce_count_show,NULL);
 790 CSROWDEV_ATTR(ch1_ce_count,S_IRUGO,csrow_ch1_ce_count_show,NULL);
 791
 792 /* control/attribute files */
 793 CSROWDEV_ATTR(ch0_dimm_label,S_IRUGO|S_IWUSR,
 794                 csrow_ch0_dimm_label_show,
 795                 csrow_ch0_dimm_label_store);
 796 CSROWDEV_ATTR(ch1_dimm_label,S_IRUGO|S_IWUSR,
 797                 csrow_ch1_dimm_label_show,
 798                 csrow_ch1_dimm_label_store);
 799
 800 /* Attributes of the CSROW<id> object */
 801 static struct csrowdev_attribute *csrow_attr[] = {
 802         &attr_dev_type,
 803         &attr_mem_type,
 804         &attr_edac_mode,
 805         &attr_size_mb,
 806         &attr_ue_count,
 807         &attr_ce_count,
 808         &attr_ch0_ce_count,
 809         &attr_ch1_ce_count,
 810         &attr_ch0_dimm_label,
 811         &attr_ch1_dimm_label,
 812         NULL,
 813 };
 814
 815 /* No memory to release */
 816 static void edac_csrow_instance_release(struct kobject *kobj)
 817 {
 818         struct csrow_info *cs;
 819
 820         debugf1("%s()\n", __func__);
 821         cs = container_of(kobj, struct csrow_info, kobj);
 822         complete(&cs->kobj_complete);
 823 }
 824
 825 static struct kobj_type ktype_csrow = {
 826         .release = edac_csrow_instance_release,
 827         .sysfs_ops = &csrowfs_ops,
 828         .default_attrs = (struct attribute **) csrow_attr,
 829 };
 830
 831 /* Create a CSROW object under specifed edac_mc_device */
 832 static int edac_create_csrow_object(struct kobject *edac_mci_kobj,
 833                 struct csrow_info *csrow, int index)
 834 {
 835         int err = 0;
 836
 837         debugf0("%s()\n", __func__);
 838         memset(&csrow->kobj, 0, sizeof(csrow->kobj));
 839
 840         /* generate ..../edac/mc/mc<id>/csrow<index>   */
 841
 842         csrow->kobj.parent = edac_mci_kobj;
 843         csrow->kobj.ktype = &ktype_csrow;
 844
 845         /* name this instance of csrow<id> */
 846         err = kobject_set_name(&csrow->kobj,"csrow%d",index);
 847
 848         if (!err) {
 849                 /* Instanstiate the csrow object */
 850                 err = kobject_register(&csrow->kobj);
 851
 852                 if (err)
 853                         debugf0("Failed to register CSROW%d\n",index);
 854                 else
 855                         debugf0("Registered CSROW%d\n",index);
 856         }
 857
 858         return err;
 859 }
 860
 861 /* sysfs data structures and methods for the MCI kobjects */
 862
 863 static ssize_t mci_reset_counters_store(struct mem_ctl_info *mci,
 864                 const char *data, size_t count)
 865 {
 866         int row, chan;
 867
 868         mci->ue_noinfo_count = 0;
 869         mci->ce_noinfo_count = 0;
 870         mci->ue_count = 0;
 871         mci->ce_count = 0;
 872
 873         for (row = 0; row < mci->nr_csrows; row++) {
 874                 struct csrow_info *ri = &mci->csrows[row];
 875
 876                 ri->ue_count = 0;
 877                 ri->ce_count = 0;
 878
 879                 for (chan = 0; chan < ri->nr_channels; chan++)
 880                         ri->channels[chan].ce_count = 0;
 881         }
 882
 883         mci->start_time = jiffies;
 884         return count;
 885 }
 886
 887 static ssize_t mci_ue_count_show(struct mem_ctl_info *mci, char *data)
 888 {
 889         return sprintf(data,"%d\n", mci->ue_count);
 890 }
 891
 892 static ssize_t mci_ce_count_show(struct mem_ctl_info *mci, char *data)
 893 {
 894         return sprintf(data,"%d\n", mci->ce_count);
 895 }
 896
 897 static ssize_t mci_ce_noinfo_show(struct mem_ctl_info *mci, char *data)
 898 {
 899         return sprintf(data,"%d\n", mci->ce_noinfo_count);
 900 }
 901
 902 static ssize_t mci_ue_noinfo_show(struct mem_ctl_info *mci, char *data)
 903 {
 904         return sprintf(data,"%d\n", mci->ue_noinfo_count);
 905 }
 906
 907 static ssize_t mci_seconds_show(struct mem_ctl_info *mci, char *data)
 908 {
 909         return sprintf(data,"%ld\n", (jiffies - mci->start_time) / HZ);
 910 }
 911
 912 static ssize_t mci_mod_name_show(struct mem_ctl_info *mci, char *data)
 913 {
 914         return sprintf(data,"%s %s\n", mci->mod_name, mci->mod_ver);
 915 }
 916
 917 static ssize_t mci_ctl_name_show(struct mem_ctl_info *mci, char *data)
 918 {
 919         return sprintf(data,"%s\n", mci->ctl_name);
 920 }
 921
 922 static int mci_output_edac_cap(char *buf, unsigned long edac_cap)
 923 {
 924         char *p = buf;
 925         int bit_idx;
 926
 927         for (bit_idx = 0; bit_idx < 8 * sizeof(edac_cap); bit_idx++) {
 928                 if ((edac_cap >> bit_idx) & 0x1)
 929                         p += sprintf(p, "%s ", edac_caps[bit_idx]);
 930         }
 931
 932         return p - buf;
 933 }
 934
 935 static ssize_t mci_edac_capability_show(struct mem_ctl_info *mci, char *data)
 936 {
 937         char *p = data;
 938
 939         p += mci_output_edac_cap(p,mci->edac_ctl_cap);
 940         p += sprintf(p, "\n");
 941         return p - data;
 942 }
 943
 944 static ssize_t mci_edac_current_capability_show(struct mem_ctl_info *mci,
 945                 char *data)
 946 {
 947         char *p = data;
 948
 949         p += mci_output_edac_cap(p,mci->edac_cap);
 950         p += sprintf(p, "\n");
 951         return p - data;
 952 }
 953
 954 static int mci_output_mtype_cap(char *buf, unsigned long mtype_cap)
 955 {
 956         char *p = buf;
 957         int bit_idx;
 958
 959         for (bit_idx = 0; bit_idx < 8 * sizeof(mtype_cap); bit_idx++) {
 960                 if ((mtype_cap >> bit_idx) & 0x1)
 961                         p += sprintf(p, "%s ", mem_types[bit_idx]);
 962         }
 963
 964         return p - buf;
 965 }
 966
 967 static ssize_t mci_supported_mem_type_show(struct mem_ctl_info *mci,
 968                 char *data)
 969 {
 970         char *p = data;
 971
 972         p += mci_output_mtype_cap(p,mci->mtype_cap);
 973         p += sprintf(p, "\n");
 974         return p - data;
 975 }
 976
 977 static ssize_t mci_size_mb_show(struct mem_ctl_info *mci, char *data)
 978 {
 979         int total_pages, csrow_idx;
 980
 981         for (total_pages = csrow_idx = 0; csrow_idx < mci->nr_csrows;
 982                         csrow_idx++) {
 983                 struct csrow_info *csrow = &mci->csrows[csrow_idx];
 984
 985                 if (!csrow->nr_pages)
 986                         continue;
 987
 988                 total_pages += csrow->nr_pages;
 989         }
 990
 991         return sprintf(data,"%u\n", PAGES_TO_MiB(total_pages));
 992 }
 993
 994 struct mcidev_attribute {
 995         struct attribute attr;
 996         ssize_t (*show)(struct mem_ctl_info *,char *);
 997         ssize_t (*store)(struct mem_ctl_info *, const char *,size_t);
 998 };
 999
1000 #define to_mci(k) container_of(k, struct mem_ctl_info, edac_mci_kobj)
1001 #define to_mcidev_attr(a) container_of(a, struct mcidev_attribute, attr)
1002
1003 static ssize_t mcidev_show(struct kobject *kobj, struct attribute *attr,
1004                 char *buffer)
1005 {
1006         struct mem_ctl_info *mem_ctl_info = to_mci(kobj);
1007         struct mcidev_attribute * mcidev_attr = to_mcidev_attr(attr);
1008
1009         if (mcidev_attr->show)
1010                 return mcidev_attr->show(mem_ctl_info, buffer);
1011
1012         return -EIO;
1013 }
1014
1015 static ssize_t mcidev_store(struct kobject *kobj, struct attribute *attr,
1016                 const char *buffer, size_t count)
1017 {
1018         struct mem_ctl_info *mem_ctl_info = to_mci(kobj);
1019         struct mcidev_attribute * mcidev_attr = to_mcidev_attr(attr);
1020
1021         if (mcidev_attr->store)
1022                 return mcidev_attr->store(mem_ctl_info, buffer, count);
1023
1024         return -EIO;
1025 }
1026
1027 static struct sysfs_ops mci_ops = {
1028         .show = mcidev_show,
1029         .store = mcidev_store
1030 };
1031
1032 #define MCIDEV_ATTR(_name,_mode,_show,_store)                   \
1033 struct mcidev_attribute mci_attr_##_name = {                    \
1034         .attr = {.name = __stringify(_name), .mode = _mode },   \
1035         .show   = _show,                                        \
1036         .store  = _store,                                       \
1037 };
1038
1039 /* Control file */
1040 MCIDEV_ATTR(reset_counters,S_IWUSR,NULL,mci_reset_counters_store);
1041
1042 /* Attribute files */
1043 MCIDEV_ATTR(mc_name,S_IRUGO,mci_ctl_name_show,NULL);
1044 MCIDEV_ATTR(module_name,S_IRUGO,mci_mod_name_show,NULL);
1045 MCIDEV_ATTR(edac_capability,S_IRUGO,mci_edac_capability_show,NULL);
1046 MCIDEV_ATTR(size_mb,S_IRUGO,mci_size_mb_show,NULL);
1047 MCIDEV_ATTR(seconds_since_reset,S_IRUGO,mci_seconds_show,NULL);
1048 MCIDEV_ATTR(ue_noinfo_count,S_IRUGO,mci_ue_noinfo_show,NULL);
1049 MCIDEV_ATTR(ce_noinfo_count,S_IRUGO,mci_ce_noinfo_show,NULL);
1050 MCIDEV_ATTR(ue_count,S_IRUGO,mci_ue_count_show,NULL);
1051 MCIDEV_ATTR(ce_count,S_IRUGO,mci_ce_count_show,NULL);
1052 MCIDEV_ATTR(edac_current_capability,S_IRUGO,
1053         mci_edac_current_capability_show,NULL);
1054 MCIDEV_ATTR(supported_mem_type,S_IRUGO,
1055         mci_supported_mem_type_show,NULL);
1056
1057 static struct mcidev_attribute *mci_attr[] = {
1058         &mci_attr_reset_counters,
1059         &mci_attr_module_name,
1060         &mci_attr_mc_name,
1061         &mci_attr_edac_capability,
1062         &mci_attr_edac_current_capability,
1063         &mci_attr_supported_mem_type,
1064         &mci_attr_size_mb,
1065         &mci_attr_seconds_since_reset,
1066         &mci_attr_ue_noinfo_count,
1067         &mci_attr_ce_noinfo_count,
1068         &mci_attr_ue_count,
1069         &mci_attr_ce_count,
1070         NULL
1071 };
1072
1073 /*
1074  * Release of a MC controlling instance
1075  */
1076 static void edac_mci_instance_release(struct kobject *kobj)
1077 {
1078         struct mem_ctl_info *mci;
1079
1080         mci = to_mci(kobj);
1081         debugf0("%s() idx=%d\n", __func__, mci->mc_idx);
1082         complete(&mci->kobj_complete);
1083 }
1084
1085 static struct kobj_type ktype_mci = {
1086         .release = edac_mci_instance_release,
1087         .sysfs_ops = &mci_ops,
1088         .default_attrs = (struct attribute **) mci_attr,
1089 };
1090
1091 #endif  /* DISABLE_EDAC_SYSFS */
1092
1093 #define EDAC_DEVICE_SYMLINK     "device"
1094
1095 /*
1096  * Create a new Memory Controller kobject instance,
1097  *      mc<id> under the 'mc' directory
1098  *
1099  * Return:
1100  *      0       Success
1101  *      !0      Failure
1102  */
1103 static int edac_create_sysfs_mci_device(struct mem_ctl_info *mci)
1104 #ifdef DISABLE_EDAC_SYSFS
1105 {
1106         return 0;
1107 }
1108 #else
1109 {
1110         int i;
1111         int err;
1112         struct csrow_info *csrow;
1113         struct kobject *edac_mci_kobj=&mci->edac_mci_kobj;
1114
1115         debugf0("%s() idx=%d\n", __func__, mci->mc_idx);
1116         memset(edac_mci_kobj, 0, sizeof(*edac_mci_kobj));
1117
1118         /* set the name of the mc<id> object */
1119         err = kobject_set_name(edac_mci_kobj,"mc%d",mci->mc_idx);
1120
1121         if (err)
1122                 return err;
1123
1124         /* link to our parent the '..../edac/mc' object */
1125         edac_mci_kobj->parent = &edac_memctrl_kobj;
1126         edac_mci_kobj->ktype = &ktype_mci;
1127
1128         /* register the mc<id> kobject */
1129         err = kobject_register(edac_mci_kobj);
1130
1131         if (err)
1132                 return err;
1133
1134         /* create a symlink for the device */
1135         err = sysfs_create_link(edac_mci_kobj, &mci->pdev->dev.kobj,
1136                                 EDAC_DEVICE_SYMLINK);
1137
1138         if (err)
1139                 goto fail0;
1140
1141         /* Make directories for each CSROW object
1142          * under the mc<id> kobject
1143          */
1144         for (i = 0; i < mci->nr_csrows; i++) {
1145                 csrow = &mci->csrows[i];
1146
1147                 /* Only expose populated CSROWs */
1148                 if (csrow->nr_pages > 0) {
1149                         err = edac_create_csrow_object(edac_mci_kobj,csrow,i);
1150
1151                         if (err)
1152                                 goto fail1;
1153                 }
1154         }
1155
1156         return 0;
1157
1158         /* CSROW error: backout what has already been registered,  */
1159 fail1:
1160         for ( i--; i >= 0; i--) {
1161                 if (csrow->nr_pages > 0) {
1162                         init_completion(&csrow->kobj_complete);
1163                         kobject_unregister(&mci->csrows[i].kobj);
1164                         wait_for_completion(&csrow->kobj_complete);
1165                 }
1166         }
1167
1168 fail0:
1169         init_completion(&mci->kobj_complete);
1170         kobject_unregister(edac_mci_kobj);
1171         wait_for_completion(&mci->kobj_complete);
1172         return err;
1173 }
1174 #endif  /* DISABLE_EDAC_SYSFS */
1175
1176 /*
1177  * remove a Memory Controller instance
1178  */
1179 static void edac_remove_sysfs_mci_device(struct mem_ctl_info *mci)
1180 {
1181 #ifndef DISABLE_EDAC_SYSFS
1182         int i;
1183
1184         debugf0("%s()\n", __func__);
1185
1186         /* remove all csrow kobjects */
1187         for (i = 0; i < mci->nr_csrows; i++) {
1188                 if (mci->csrows[i].nr_pages > 0) {
1189                         init_completion(&mci->csrows[i].kobj_complete);
1190                         kobject_unregister(&mci->csrows[i].kobj);
1191                         wait_for_completion(&mci->csrows[i].kobj_complete);
1192                 }
1193         }
1194
1195         sysfs_remove_link(&mci->edac_mci_kobj, EDAC_DEVICE_SYMLINK);
1196         init_completion(&mci->kobj_complete);
1197         kobject_unregister(&mci->edac_mci_kobj);
1198         wait_for_completion(&mci->kobj_complete);
1199 #endif  /* DISABLE_EDAC_SYSFS */
1200 }
1201
1202 /* END OF sysfs data and methods */
1203
1204 #ifdef CONFIG_EDAC_DEBUG
1205
1206 void edac_mc_dump_channel(struct channel_info *chan)
1207 {
1208         debugf4("\tchannel = %p\n", chan);
1209         debugf4("\tchannel->chan_idx = %d\n", chan->chan_idx);
1210         debugf4("\tchannel->ce_count = %d\n", chan->ce_count);
1211         debugf4("\tchannel->label = '%s'\n", chan->label);
1212         debugf4("\tchannel->csrow = %p\n\n", chan->csrow);
1213 }
1214 EXPORT_SYMBOL_GPL(edac_mc_dump_channel);
1215
1216 void edac_mc_dump_csrow(struct csrow_info *csrow)
1217 {
1218         debugf4("\tcsrow = %p\n", csrow);
1219         debugf4("\tcsrow->csrow_idx = %d\n", csrow->csrow_idx);
1220         debugf4("\tcsrow->first_page = 0x%lx\n",
1221                 csrow->first_page);
1222         debugf4("\tcsrow->last_page = 0x%lx\n", csrow->last_page);
1223         debugf4("\tcsrow->page_mask = 0x%lx\n", csrow->page_mask);
1224         debugf4("\tcsrow->nr_pages = 0x%x\n", csrow->nr_pages);
1225         debugf4("\tcsrow->nr_channels = %d\n",
1226                 csrow->nr_channels);
1227         debugf4("\tcsrow->channels = %p\n", csrow->channels);
1228         debugf4("\tcsrow->mci = %p\n\n", csrow->mci);
1229 }
1230 EXPORT_SYMBOL_GPL(edac_mc_dump_csrow);
1231
1232 void edac_mc_dump_mci(struct mem_ctl_info *mci)
1233 {
1234         debugf3("\tmci = %p\n", mci);
1235         debugf3("\tmci->mtype_cap = %lx\n", mci->mtype_cap);
1236         debugf3("\tmci->edac_ctl_cap = %lx\n", mci->edac_ctl_cap);
1237         debugf3("\tmci->edac_cap = %lx\n", mci->edac_cap);
1238         debugf4("\tmci->edac_check = %p\n", mci->edac_check);
1239         debugf3("\tmci->nr_csrows = %d, csrows = %p\n",
1240                 mci->nr_csrows, mci->csrows);
1241         debugf3("\tpdev = %p\n", mci->pdev);
1242         debugf3("\tmod_name:ctl_name = %s:%s\n",
1243                 mci->mod_name, mci->ctl_name);
1244         debugf3("\tpvt_info = %p\n\n", mci->pvt_info);
1245 }
1246 EXPORT_SYMBOL_GPL(edac_mc_dump_mci);
1247
1248 #endif  /* CONFIG_EDAC_DEBUG */
1249
1250 /* 'ptr' points to a possibly unaligned item X such that sizeof(X) is 'size'.
1251  * Adjust 'ptr' so that its alignment is at least as stringent as what the
1252  * compiler would provide for X and return the aligned result.
1253  *
1254  * If 'size' is a constant, the compiler will optimize this whole function
1255  * down to either a no-op or the addition of a constant to the value of 'ptr'.
1256  */
1257 static inline char * align_ptr(void *ptr, unsigned size)
1258 {
1259         unsigned align, r;
1260
1261         /* Here we assume that the alignment of a "long long" is the most
1262          * stringent alignment that the compiler will ever provide by default.
1263          * As far as I know, this is a reasonable assumption.
1264          */
1265         if (size > sizeof(long))
1266                 align = sizeof(long long);
1267         else if (size > sizeof(int))
1268                 align = sizeof(long);
1269         else if (size > sizeof(short))
1270                 align = sizeof(int);
1271         else if (size > sizeof(char))
1272                 align = sizeof(short);
1273         else
1274                 return (char *) ptr;
1275
1276         r = size % align;
1277
1278         if (r == 0)
1279                 return (char *) ptr;
1280
1281         return (char *) (((unsigned long) ptr) + align - r);
1282 }
1283
1284 /**
1285  * edac_mc_alloc: Allocate a struct mem_ctl_info structure
1286  * @size_pvt:   size of private storage needed
1287  * @nr_csrows:  Number of CWROWS needed for this MC
1288  * @nr_chans:   Number of channels for the MC
1289  *
1290  * Everything is kmalloc'ed as one big chunk - more efficient.
1291  * Only can be used if all structures have the same lifetime - otherwise
1292  * you have to allocate and initialize your own structures.
1293  *
1294  * Use edac_mc_free() to free mc structures allocated by this function.
1295  *
1296  * Returns:
1297  *      NULL allocation failed
1298  *      struct mem_ctl_info pointer
1299  */
1300 struct mem_ctl_info *edac_mc_alloc(unsigned sz_pvt, unsigned nr_csrows,
1301                 unsigned nr_chans)
1302 {
1303         struct mem_ctl_info *mci;
1304         struct csrow_info *csi, *csrow;
1305         struct channel_info *chi, *chp, *chan;
1306         void *pvt;
1307         unsigned size;
1308         int row, chn;
1309
1310         /* Figure out the offsets of the various items from the start of an mc
1311          * structure.  We want the alignment of each item to be at least as
1312          * stringent as what the compiler would provide if we could simply
1313          * hardcode everything into a single struct.
1314          */
1315         mci = (struct mem_ctl_info *) 0;
1316         csi = (struct csrow_info *)align_ptr(&mci[1], sizeof(*csi));
1317         chi = (struct channel_info *)
1318                         align_ptr(&csi[nr_csrows], sizeof(*chi));
1319         pvt = align_ptr(&chi[nr_chans * nr_csrows], sz_pvt);
1320         size = ((unsigned long) pvt) + sz_pvt;
1321
1322         if ((mci = kmalloc(size, GFP_KERNEL)) == NULL)
1323                 return NULL;
1324
1325         /* Adjust pointers so they point within the memory we just allocated
1326          * rather than an imaginary chunk of memory located at address 0.
1327          */
1328         csi = (struct csrow_info *) (((char *) mci) + ((unsigned long) csi));
1329         chi = (struct channel_info *) (((char *) mci) + ((unsigned long) chi));
1330         pvt = sz_pvt ? (((char *) mci) + ((unsigned long) pvt)) : NULL;
1331
1332         memset(mci, 0, size);  /* clear all fields */
1333         mci->csrows = csi;
1334         mci->pvt_info = pvt;
1335         mci->nr_csrows = nr_csrows;
1336
1337         for (row = 0; row < nr_csrows; row++) {
1338                 csrow = &csi[row];
1339                 csrow->csrow_idx = row;
1340                 csrow->mci = mci;
1341                 csrow->nr_channels = nr_chans;
1342                 chp = &chi[row * nr_chans];
1343                 csrow->channels = chp;
1344
1345                 for (chn = 0; chn < nr_chans; chn++) {
1346                         chan = &chp[chn];
1347                         chan->chan_idx = chn;
1348                         chan->csrow = csrow;
1349                 }
1350         }
1351
1352         return mci;
1353 }
1354 EXPORT_SYMBOL_GPL(edac_mc_alloc);
1355
1356 /**
1357  * edac_mc_free:  Free a previously allocated 'mci' structure
1358  * @mci: pointer to a struct mem_ctl_info structure
1359  */
1360 void edac_mc_free(struct mem_ctl_info *mci)
1361 {
1362         kfree(mci);
1363 }
1364 EXPORT_SYMBOL_GPL(edac_mc_free);
1365
1366 static struct mem_ctl_info *find_mci_by_pdev(struct pci_dev *pdev)
1367 {
1368         struct mem_ctl_info *mci;
1369         struct list_head *item;
1370
1371         debugf3("%s()\n", __func__);
1372
1373         list_for_each(item, &mc_devices) {
1374                 mci = list_entry(item, struct mem_ctl_info, link);
1375
1376                 if (mci->pdev == pdev)
1377                         return mci;
1378         }
1379
1380         return NULL;
1381 }
1382
1383 static int add_mc_to_global_list(struct mem_ctl_info *mci)
1384 {
1385         struct list_head *item, *insert_before;
1386         struct mem_ctl_info *p;
1387         int i;
1388
1389         if (list_empty(&mc_devices)) {
1390                 mci->mc_idx = 0;
1391                 insert_before = &mc_devices;
1392         } else {
1393                 if (find_mci_by_pdev(mci->pdev)) {
1394                         edac_printk(KERN_WARNING, EDAC_MC,
1395                                 "%s (%s) %s %s already assigned %d\n",
1396                                 mci->pdev->dev.bus_id,
1397                                 pci_name(mci->pdev), mci->mod_name,
1398                                 mci->ctl_name, mci->mc_idx);
1399                         return 1;
1400                 }
1401
1402                 insert_before = NULL;
1403                 i = 0;
1404
1405                 list_for_each(item, &mc_devices) {
1406                         p = list_entry(item, struct mem_ctl_info, link);
1407
1408                         if (p->mc_idx != i) {
1409                                 insert_before = item;
1410                                 break;
1411                         }
1412
1413                         i++;
1414                 }
1415
1416                 mci->mc_idx = i;
1417
1418                 if (insert_before == NULL)
1419                         insert_before = &mc_devices;
1420         }
1421
1422         list_add_tail_rcu(&mci->link, insert_before);
1423         return 0;
1424 }
1425
1426 static void complete_mc_list_del(struct rcu_head *head)
1427 {
1428         struct mem_ctl_info *mci;
1429
1430         mci = container_of(head, struct mem_ctl_info, rcu);
1431         INIT_LIST_HEAD(&mci->link);
1432         complete(&mci->complete);
1433 }
1434
1435 static void del_mc_from_global_list(struct mem_ctl_info *mci)
1436 {
1437         list_del_rcu(&mci->link);
1438         init_completion(&mci->complete);
1439         call_rcu(&mci->rcu, complete_mc_list_del);
1440         wait_for_completion(&mci->complete);
1441 }
1442
1443 /**
1444  * edac_mc_add_mc: Insert the 'mci' structure into the mci global list and
1445  *                 create sysfs entries associated with mci structure
1446  * @mci: pointer to the mci structure to be added to the list
1447  *
1448  * Return:
1449  *      0       Success
1450  *      !0      Failure
1451  */
1452
1453 /* FIXME - should a warning be printed if no error detection? correction? */
1454 int edac_mc_add_mc(struct mem_ctl_info *mci)
1455 {
1456         debugf0("%s()\n", __func__);
1457 #ifdef CONFIG_EDAC_DEBUG
1458         if (edac_debug_level >= 3)
1459                 edac_mc_dump_mci(mci);
1460
1461         if (edac_debug_level >= 4) {
1462                 int i;
1463
1464                 for (i = 0; i < mci->nr_csrows; i++) {
1465                         int j;
1466
1467                         edac_mc_dump_csrow(&mci->csrows[i]);
1468                         for (j = 0; j < mci->csrows[i].nr_channels; j++)
1469                                 edac_mc_dump_channel(
1470                                         &mci->csrows[i].channels[j]);
1471                 }
1472         }
1473 #endif
1474         down(&mem_ctls_mutex);
1475
1476         if (add_mc_to_global_list(mci))
1477                 goto fail0;
1478
1479         /* set load time so that error rate can be tracked */
1480         mci->start_time = jiffies;
1481
1482         if (edac_create_sysfs_mci_device(mci)) {
1483                 edac_mc_printk(mci, KERN_WARNING,
1484                         "failed to create sysfs device\n");
1485                 goto fail1;
1486         }
1487
1488         /* Report action taken */
1489         edac_mc_printk(mci, KERN_INFO, "Giving out device to %s %s: PCI %s\n",
1490                 mci->mod_name, mci->ctl_name, pci_name(mci->pdev));
1491
1492         up(&mem_ctls_mutex);
1493         return 0;
1494
1495 fail1:
1496         del_mc_from_global_list(mci);
1497
1498 fail0:
1499         up(&mem_ctls_mutex);
1500         return 1;
1501 }
1502 EXPORT_SYMBOL_GPL(edac_mc_add_mc);
1503
1504 /**
1505  * edac_mc_del_mc: Remove sysfs entries for specified mci structure and
1506  *                 remove mci structure from global list
1507  * @pdev: Pointer to 'struct pci_dev' representing mci structure to remove.
1508  *
1509  * Return pointer to removed mci structure, or NULL if device not found.
1510  */
1511 struct mem_ctl_info * edac_mc_del_mc(struct pci_dev *pdev)
1512 {
1513         struct mem_ctl_info *mci;
1514
1515         debugf0("MC: %s()\n", __func__);
1516         down(&mem_ctls_mutex);
1517
1518         if ((mci = find_mci_by_pdev(pdev)) == NULL) {
1519                 up(&mem_ctls_mutex);
1520                 return NULL;
1521         }
1522
1523         edac_remove_sysfs_mci_device(mci);
1524         del_mc_from_global_list(mci);
1525         up(&mem_ctls_mutex);
1526         edac_printk(KERN_INFO, EDAC_MC,
1527                 "Removed device %d for %s %s: PCI %s\n", mci->mc_idx,
1528                 mci->mod_name, mci->ctl_name, pci_name(mci->pdev));
1529         return mci;
1530 }
1531 EXPORT_SYMBOL_GPL(edac_mc_del_mc);
1532
1533 void edac_mc_scrub_block(unsigned long page, unsigned long offset, u32 size)
1534 {
1535         struct page *pg;
1536         void *virt_addr;
1537         unsigned long flags = 0;
1538
1539         debugf3("%s()\n", __func__);
1540
1541         /* ECC error page was not in our memory. Ignore it. */
1542         if(!pfn_valid(page))
1543                 return;
1544
1545         /* Find the actual page structure then map it and fix */
1546         pg = pfn_to_page(page);
1547
1548         if (PageHighMem(pg))
1549                 local_irq_save(flags);
1550
1551         virt_addr = kmap_atomic(pg, KM_BOUNCE_READ);
1552
1553         /* Perform architecture specific atomic scrub operation */
1554         atomic_scrub(virt_addr + offset, size);
1555
1556         /* Unmap and complete */
1557         kunmap_atomic(virt_addr, KM_BOUNCE_READ);
1558
1559         if (PageHighMem(pg))
1560                 local_irq_restore(flags);
1561 }
1562 EXPORT_SYMBOL_GPL(edac_mc_scrub_block);
1563
1564 /* FIXME - should return -1 */
1565 int edac_mc_find_csrow_by_page(struct mem_ctl_info *mci, unsigned long page)
1566 {
1567         struct csrow_info *csrows = mci->csrows;
1568         int row, i;
1569
1570         debugf1("MC%d: %s(): 0x%lx\n", mci->mc_idx, __func__, page);
1571         row = -1;
1572
1573         for (i = 0; i < mci->nr_csrows; i++) {
1574                 struct csrow_info *csrow = &csrows[i];
1575
1576                 if (csrow->nr_pages == 0)
1577                         continue;
1578
1579                 debugf3("MC%d: %s(): first(0x%lx) page(0x%lx) last(0x%lx) "
1580                         "mask(0x%lx)\n", mci->mc_idx, __func__,
1581                         csrow->first_page, page, csrow->last_page,
1582                         csrow->page_mask);
1583
1584                 if ((page >= csrow->first_page) &&
1585                     (page <= csrow->last_page) &&
1586                     ((page & csrow->page_mask) ==
1587                      (csrow->first_page & csrow->page_mask))) {
1588                         row = i;
1589                         break;
1590                 }
1591         }
1592
1593         if (row == -1)
1594                 edac_mc_printk(mci, KERN_ERR,
1595                         "could not look up page error address %lx\n",
1596                         (unsigned long) page);
1597
1598         return row;
1599 }
1600 EXPORT_SYMBOL_GPL(edac_mc_find_csrow_by_page);
1601
1602 /* FIXME - setable log (warning/emerg) levels */
1603 /* FIXME - integrate with evlog: http://evlog.sourceforge.net/ */
1604 void edac_mc_handle_ce(struct mem_ctl_info *mci,
1605                 unsigned long page_frame_number, unsigned long offset_in_page,
1606                 unsigned long syndrome, int row, int channel, const char *msg)
1607 {
1608         unsigned long remapped_page;
1609
1610         debugf3("MC%d: %s()\n", mci->mc_idx, __func__);
1611
1612         /* FIXME - maybe make panic on INTERNAL ERROR an option */
1613         if (row >= mci->nr_csrows || row < 0) {
1614                 /* something is wrong */
1615                 edac_mc_printk(mci, KERN_ERR,
1616                         "INTERNAL ERROR: row out of range "
1617                         "(%d >= %d)\n", row, mci->nr_csrows);
1618                 edac_mc_handle_ce_no_info(mci, "INTERNAL ERROR");
1619                 return;
1620         }
1621
1622         if (channel >= mci->csrows[row].nr_channels || channel < 0) {
1623                 /* something is wrong */
1624                 edac_mc_printk(mci, KERN_ERR,
1625                         "INTERNAL ERROR: channel out of range "
1626                         "(%d >= %d)\n", channel,
1627                         mci->csrows[row].nr_channels);
1628                 edac_mc_handle_ce_no_info(mci, "INTERNAL ERROR");
1629                 return;
1630         }
1631
1632         if (log_ce)
1633                 /* FIXME - put in DIMM location */
1634                 edac_mc_printk(mci, KERN_WARNING,
1635                         "CE page 0x%lx, offset 0x%lx, grain %d, syndrome "
1636                         "0x%lx, row %d, channel %d, label \"%s\": %s\n",
1637                         page_frame_number, offset_in_page,
1638                         mci->csrows[row].grain, syndrome, row, channel,
1639                         mci->csrows[row].channels[channel].label, msg);
1640
1641         mci->ce_count++;
1642         mci->csrows[row].ce_count++;
1643         mci->csrows[row].channels[channel].ce_count++;
1644
1645         if (mci->scrub_mode & SCRUB_SW_SRC) {
1646                 /*
1647                  * Some MC's can remap memory so that it is still available
1648                  * at a different address when PCI devices map into memory.
1649                  * MC's that can't do this lose the memory where PCI devices
1650                  * are mapped.  This mapping is MC dependant and so we call
1651                  * back into the MC driver for it to map the MC page to
1652                  * a physical (CPU) page which can then be mapped to a virtual
1653                  * page - which can then be scrubbed.
1654                  */
1655                 remapped_page = mci->ctl_page_to_phys ?
1656                     mci->ctl_page_to_phys(mci, page_frame_number) :
1657                     page_frame_number;
1658
1659                 edac_mc_scrub_block(remapped_page, offset_in_page,
1660                                         mci->csrows[row].grain);
1661         }
1662 }
1663 EXPORT_SYMBOL_GPL(edac_mc_handle_ce);
1664
1665 void edac_mc_handle_ce_no_info(struct mem_ctl_info *mci, const char *msg)
1666 {
1667         if (log_ce)
1668                 edac_mc_printk(mci, KERN_WARNING,
1669                         "CE - no information available: %s\n", msg);
1670
1671         mci->ce_noinfo_count++;
1672         mci->ce_count++;
1673 }
1674 EXPORT_SYMBOL_GPL(edac_mc_handle_ce_no_info);
1675
1676 void edac_mc_handle_ue(struct mem_ctl_info *mci,
1677                 unsigned long page_frame_number, unsigned long offset_in_page,
1678                 int row, const char *msg)
1679 {
1680         int len = EDAC_MC_LABEL_LEN * 4;
1681         char labels[len + 1];
1682         char *pos = labels;
1683         int chan;
1684         int chars;
1685
1686         debugf3("MC%d: %s()\n", mci->mc_idx, __func__);
1687
1688         /* FIXME - maybe make panic on INTERNAL ERROR an option */
1689         if (row >= mci->nr_csrows || row < 0) {
1690                 /* something is wrong */
1691                 edac_mc_printk(mci, KERN_ERR,
1692                         "INTERNAL ERROR: row out of range "
1693                         "(%d >= %d)\n", row, mci->nr_csrows);
1694                 edac_mc_handle_ue_no_info(mci, "INTERNAL ERROR");
1695                 return;
1696         }
1697
1698         chars = snprintf(pos, len + 1, "%s",
1699                         mci->csrows[row].channels[0].label);
1700         len -= chars;
1701         pos += chars;
1702
1703         for (chan = 1; (chan < mci->csrows[row].nr_channels) && (len > 0);
1704              chan++) {
1705                 chars = snprintf(pos, len + 1, ":%s",
1706                                 mci->csrows[row].channels[chan].label);
1707                 len -= chars;
1708                 pos += chars;
1709         }
1710
1711         if (log_ue)
1712                 edac_mc_printk(mci, KERN_EMERG,
1713                         "UE page 0x%lx, offset 0x%lx, grain %d, row %d, "
1714                         "labels \"%s\": %s\n", page_frame_number,
1715                         offset_in_page, mci->csrows[row].grain, row, labels,
1716                         msg);
1717
1718         if (panic_on_ue)
1719                 panic("EDAC MC%d: UE page 0x%lx, offset 0x%lx, grain %d, "
1720                         "row %d, labels \"%s\": %s\n", mci->mc_idx,
1721                         page_frame_number, offset_in_page,
1722                         mci->csrows[row].grain, row, labels, msg);
1723
1724         mci->ue_count++;
1725         mci->csrows[row].ue_count++;
1726 }
1727 EXPORT_SYMBOL_GPL(edac_mc_handle_ue);
1728
1729 void edac_mc_handle_ue_no_info(struct mem_ctl_info *mci, const char *msg)
1730 {
1731         if (panic_on_ue)
1732                 panic("EDAC MC%d: Uncorrected Error", mci->mc_idx);
1733
1734         if (log_ue)
1735                 edac_mc_printk(mci, KERN_WARNING,
1736                         "UE - no information available: %s\n", msg);
1737         mci->ue_noinfo_count++;
1738         mci->ue_count++;
1739 }
1740 EXPORT_SYMBOL_GPL(edac_mc_handle_ue_no_info);
1741
1742 #ifdef CONFIG_PCI
1743
1744 static u16 get_pci_parity_status(struct pci_dev *dev, int secondary)
1745 {
1746         int where;
1747         u16 status;
1748
1749         where = secondary ? PCI_SEC_STATUS : PCI_STATUS;
1750         pci_read_config_word(dev, where, &status);
1751
1752         /* If we get back 0xFFFF then we must suspect that the card has been
1753          * pulled but the Linux PCI layer has not yet finished cleaning up.
1754          * We don't want to report on such devices
1755          */
1756
1757         if (status == 0xFFFF) {
1758                 u32 sanity;
1759
1760                 pci_read_config_dword(dev, 0, &sanity);
1761
1762                 if (sanity == 0xFFFFFFFF)
1763                         return 0;
1764         }
1765
1766         status &= PCI_STATUS_DETECTED_PARITY | PCI_STATUS_SIG_SYSTEM_ERROR |
1767                 PCI_STATUS_PARITY;
1768
1769         if (status)
1770                 /* reset only the bits we are interested in */
1771                 pci_write_config_word(dev, where, status);
1772
1773         return status;
1774 }
1775
1776 typedef void (*pci_parity_check_fn_t) (struct pci_dev *dev);
1777
1778 /* Clear any PCI parity errors logged by this device. */
1779 static void edac_pci_dev_parity_clear(struct pci_dev *dev)
1780 {
1781         u8 header_type;
1782
1783         get_pci_parity_status(dev, 0);
1784
1785         /* read the device TYPE, looking for bridges */
1786         pci_read_config_byte(dev, PCI_HEADER_TYPE, &header_type);
1787
1788         if ((header_type & 0x7F) == PCI_HEADER_TYPE_BRIDGE)
1789                 get_pci_parity_status(dev, 1);
1790 }
1791
1792 /*
1793  *  PCI Parity polling
1794  *
1795  */
1796 static void edac_pci_dev_parity_test(struct pci_dev *dev)
1797 {
1798         u16 status;
1799         u8  header_type;
1800
1801         /* read the STATUS register on this device
1802          */
1803         status = get_pci_parity_status(dev, 0);
1804
1805         debugf2("PCI STATUS= 0x%04x %s\n", status, dev->dev.bus_id );
1806
1807         /* check the status reg for errors */
1808         if (status) {
1809                 if (status & (PCI_STATUS_SIG_SYSTEM_ERROR))
1810                         edac_printk(KERN_CRIT, EDAC_PCI,
1811                                 "Signaled System Error on %s\n",
1812                                 pci_name(dev));
1813
1814                 if (status & (PCI_STATUS_PARITY)) {
1815                         edac_printk(KERN_CRIT, EDAC_PCI,
1816                                 "Master Data Parity Error on %s\n",
1817                                 pci_name(dev));
1818
1819                         atomic_inc(&pci_parity_count);
1820                 }
1821
1822                 if (status & (PCI_STATUS_DETECTED_PARITY)) {
1823                         edac_printk(KERN_CRIT, EDAC_PCI,
1824                                 "Detected Parity Error on %s\n",
1825                                 pci_name(dev));
1826
1827                         atomic_inc(&pci_parity_count);
1828                 }
1829         }
1830
1831         /* read the device TYPE, looking for bridges */
1832         pci_read_config_byte(dev, PCI_HEADER_TYPE, &header_type);
1833
1834         debugf2("PCI HEADER TYPE= 0x%02x %s\n", header_type, dev->dev.bus_id );
1835
1836         if ((header_type & 0x7F) == PCI_HEADER_TYPE_BRIDGE) {
1837                 /* On bridges, need to examine secondary status register  */
1838                 status = get_pci_parity_status(dev, 1);
1839
1840                 debugf2("PCI SEC_STATUS= 0x%04x %s\n",
1841                                 status, dev->dev.bus_id );
1842
1843                 /* check the secondary status reg for errors */
1844                 if (status) {
1845                         if (status & (PCI_STATUS_SIG_SYSTEM_ERROR))
1846                                 edac_printk(KERN_CRIT, EDAC_PCI, "Bridge "
1847                                         "Signaled System Error on %s\n",
1848                                         pci_name(dev));
1849
1850                         if (status & (PCI_STATUS_PARITY)) {
1851                                 edac_printk(KERN_CRIT, EDAC_PCI, "Bridge "
1852                                         "Master Data Parity Error on "
1853                                         "%s\n", pci_name(dev));
1854
1855                                 atomic_inc(&pci_parity_count);
1856                         }
1857
1858                         if (status & (PCI_STATUS_DETECTED_PARITY)) {
1859                                 edac_printk(KERN_CRIT, EDAC_PCI, "Bridge "
1860                                         "Detected Parity Error on %s\n",
1861                                         pci_name(dev));
1862
1863                                 atomic_inc(&pci_parity_count);
1864                         }
1865                 }
1866         }
1867 }
1868
1869 /*
1870  * check_dev_on_list: Scan for a PCI device on a white/black list
1871  * @list:       an EDAC  &edac_pci_device_list  white/black list pointer
1872  * @free_index: index of next free entry on the list
1873  * @pci_dev:    PCI Device pointer
1874  *
1875  * see if list contains the device.
1876  *
1877  * Returns:     0 not found
1878  *              1 found on list
1879  */
1880 static int check_dev_on_list(struct edac_pci_device_list *list,
1881                 int free_index, struct pci_dev *dev)
1882 {
1883         int i;
1884         int rc = 0;     /* Assume not found */
1885         unsigned short vendor=dev->vendor;
1886         unsigned short device=dev->device;
1887
1888         /* Scan the list, looking for a vendor/device match */
1889         for (i = 0; i < free_index; i++, list++ ) {
1890                 if ((list->vendor == vendor ) && (list->device == device )) {
1891                         rc = 1;
1892                         break;
1893                 }
1894         }
1895
1896         return rc;
1897 }
1898
1899 /*
1900  * pci_dev parity list iterator
1901  *      Scan the PCI device list for one iteration, looking for SERRORs
1902  *      Master Parity ERRORS or Parity ERRORs on primary or secondary devices
1903  */
1904 static inline void edac_pci_dev_parity_iterator(pci_parity_check_fn_t fn)
1905 {
1906         struct pci_dev *dev = NULL;
1907
1908         /* request for kernel access to the next PCI device, if any,
1909          * and while we are looking at it have its reference count
1910          * bumped until we are done with it
1911          */
1912         while((dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev)) != NULL) {
1913                 /* if whitelist exists then it has priority, so only scan
1914                  * those devices on the whitelist
1915                  */
1916                 if (pci_whitelist_count > 0 ) {
1917                         if (check_dev_on_list(pci_whitelist,
1918                                         pci_whitelist_count, dev))
1919                                 fn(dev);
1920                 } else {
1921                         /*
1922                          * if no whitelist, then check if this devices is
1923                          * blacklisted
1924                          */
1925                         if (!check_dev_on_list(pci_blacklist,
1926                                         pci_blacklist_count, dev))
1927                                 fn(dev);
1928                 }
1929         }
1930 }
1931
1932 static void do_pci_parity_check(void)
1933 {
1934         unsigned long flags;
1935         int before_count;
1936
1937         debugf3("%s()\n", __func__);
1938
1939         if (!check_pci_parity)
1940                 return;
1941
1942         before_count = atomic_read(&pci_parity_count);
1943
1944         /* scan all PCI devices looking for a Parity Error on devices and
1945          * bridges
1946          */
1947         local_irq_save(flags);
1948         edac_pci_dev_parity_iterator(edac_pci_dev_parity_test);
1949         local_irq_restore(flags);
1950
1951         /* Only if operator has selected panic on PCI Error */
1952         if (panic_on_pci_parity) {
1953                 /* If the count is different 'after' from 'before' */
1954                 if (before_count != atomic_read(&pci_parity_count))
1955                         panic("EDAC: PCI Parity Error");
1956         }
1957 }
1958
1959 static inline void clear_pci_parity_errors(void)
1960 {
1961         /* Clear any PCI bus parity errors that devices initially have logged
1962          * in their registers.
1963          */
1964         edac_pci_dev_parity_iterator(edac_pci_dev_parity_clear);
1965 }
1966
1967 #else  /* CONFIG_PCI */
1968
1969 static inline void do_pci_parity_check(void)
1970 {
1971         /* no-op */
1972 }
1973
1974 static inline void clear_pci_parity_errors(void)
1975 {
1976         /* no-op */
1977 }
1978
1979 #endif  /* CONFIG_PCI */
1980
1981 /*
1982  * Iterate over all MC instances and check for ECC, et al, errors
1983  */
1984 static inline void check_mc_devices(void)
1985 {
1986         struct list_head *item;
1987         struct mem_ctl_info *mci;
1988
1989         debugf3("%s()\n", __func__);
1990         down(&mem_ctls_mutex);
1991
1992         list_for_each(item, &mc_devices) {
1993                 mci = list_entry(item, struct mem_ctl_info, link);
1994
1995                 if (mci->edac_check != NULL)
1996                         mci->edac_check(mci);
1997         }
1998
1999         up(&mem_ctls_mutex);
2000 }
2001
2002 /*
2003  * Check MC status every poll_msec.
2004  * Check PCI status every poll_msec as well.
2005  *
2006  * This where the work gets done for edac.
2007  *
2008  * SMP safe, doesn't use NMI, and auto-rate-limits.
2009  */
2010 static void do_edac_check(void)
2011 {
2012         debugf3("%s()\n", __func__);
2013         check_mc_devices();
2014         do_pci_parity_check();
2015 }
2016
2017 static int edac_kernel_thread(void *arg)
2018 {
2019         while (!kthread_should_stop()) {
2020                 do_edac_check();
2021
2022                 /* goto sleep for the interval */
2023                 schedule_timeout_interruptible((HZ * poll_msec) / 1000);
2024                 try_to_freeze();
2025         }
2026
2027         return 0;
2028 }
2029
2030 /*
2031  * edac_mc_init
2032  *      module initialization entry point
2033  */
2034 static int __init edac_mc_init(void)
2035 {
2036         edac_printk(KERN_INFO, EDAC_MC, EDAC_MC_VERSION "\n");
2037
2038         /*
2039          * Harvest and clear any boot/initialization PCI parity errors
2040          *
2041          * FIXME: This only clears errors logged by devices present at time of
2042          *      module initialization.  We should also do an initial clear
2043          *      of each newly hotplugged device.
2044          */
2045         clear_pci_parity_errors();
2046
2047         /* Create the MC sysfs entries */
2048         if (edac_sysfs_memctrl_setup()) {
2049                 edac_printk(KERN_ERR, EDAC_MC,
2050                         "Error initializing sysfs code\n");
2051                 return -ENODEV;
2052         }
2053
2054         /* Create the PCI parity sysfs entries */
2055         if (edac_sysfs_pci_setup()) {
2056                 edac_sysfs_memctrl_teardown();
2057                 edac_printk(KERN_ERR, EDAC_MC,
2058                         "EDAC PCI: Error initializing sysfs code\n");
2059                 return -ENODEV;
2060         }
2061
2062         /* create our kernel thread */
2063         edac_thread = kthread_run(edac_kernel_thread, NULL, "kedac");
2064
2065         if (IS_ERR(edac_thread)) {
2066                 /* remove the sysfs entries */
2067                 edac_sysfs_memctrl_teardown();
2068                 edac_sysfs_pci_teardown();
2069                 return PTR_ERR(edac_thread);
2070         }
2071
2072         return 0;
2073 }
2074
2075 /*
2076  * edac_mc_exit()
2077  *      module exit/termination functioni
2078  */
2079 static void __exit edac_mc_exit(void)
2080 {
2081         debugf0("%s()\n", __func__);
2082         kthread_stop(edac_thread);
2083
2084         /* tear down the sysfs device */
2085         edac_sysfs_memctrl_teardown();
2086         edac_sysfs_pci_teardown();
2087 }
2088
2089 module_init(edac_mc_init);
2090 module_exit(edac_mc_exit);
2091
2092 MODULE_LICENSE("GPL");
2093 MODULE_AUTHOR("Linux Networx (http://lnxi.com) Thayne Harbaugh et al\n"
2094         "Based on work by Dan Hollis et al");
2095 MODULE_DESCRIPTION("Core library routines for MC reporting");
2096
2097 module_param(panic_on_ue, int, 0644);
2098 MODULE_PARM_DESC(panic_on_ue, "Panic on uncorrected error: 0=off 1=on");
2099 module_param(check_pci_parity, int, 0644);
2100 MODULE_PARM_DESC(check_pci_parity, "Check for PCI bus parity errors: 0=off 1=on");
2101 module_param(panic_on_pci_parity, int, 0644);
2102 MODULE_PARM_DESC(panic_on_pci_parity, "Panic on PCI Bus Parity error: 0=off 1=on");
2103 module_param(log_ue, int, 0644);
2104 MODULE_PARM_DESC(log_ue, "Log uncorrectable error to console: 0=off 1=on");
2105 module_param(log_ce, int, 0644);
2106 MODULE_PARM_DESC(log_ce, "Log correctable error to console: 0=off 1=on");
2107 module_param(poll_msec, int, 0644);
2108 MODULE_PARM_DESC(poll_msec, "Polling period in milliseconds");
2109 #ifdef CONFIG_EDAC_DEBUG
2110 module_param(edac_debug_level, int, 0644);
2111 MODULE_PARM_DESC(edac_debug_level, "Debug level");
2112 #endif