1/* 2 * File: mca_drv.c 3 * Purpose: Generic MCA handling layer 4 * 5 * Copyright (C) 2004 FUJITSU LIMITED 6 * Copyright (C) Hidetoshi Seto (seto.hidetoshi@jp.fujitsu.com) 7 * Copyright (C) 2005 Silicon Graphics, Inc 8 * Copyright (C) 2005 Keith Owens <kaos@sgi.com> 9 * Copyright (C) 2006 Russ Anderson <rja@sgi.com> 10 */ 11#include <linux/types.h> 12#include <linux/init.h> 13#include <linux/sched.h> 14#include <linux/interrupt.h> 15#include <linux/irq.h> 16#include <linux/kallsyms.h> 17#include <linux/bootmem.h> 18#include <linux/acpi.h> 19#include <linux/timer.h> 20#include <linux/module.h> 21#include <linux/kernel.h> 22#include <linux/smp.h> 23#include <linux/workqueue.h> 24#include <linux/mm.h> 25 26#include <asm/delay.h> 27#include <asm/machvec.h> 28#include <asm/page.h> 29#include <asm/ptrace.h> 30#include <asm/system.h> 31#include <asm/sal.h> 32#include <asm/mca.h> 33 34#include <asm/irq.h> 35#include <asm/hw_irq.h> 36 37#include "mca_drv.h" 38 39/* max size of SAL error record (default) */ 40static int sal_rec_max = 10000; 41 42/* from mca_drv_asm.S */ 43extern void *mca_handler_bhhook(void); 44 45static DEFINE_SPINLOCK(mca_bh_lock); 46 47typedef enum { 48 MCA_IS_LOCAL = 0, 49 MCA_IS_GLOBAL = 1 50} mca_type_t; 51 52#define MAX_PAGE_ISOLATE 1024 53 54static struct page *page_isolate[MAX_PAGE_ISOLATE]; 55static int num_page_isolate = 0; 56 57typedef enum { 58 ISOLATE_NG, 59 ISOLATE_OK, 60 ISOLATE_NONE 61} isolate_status_t; 62 63typedef enum { 64 MCA_NOT_RECOVERED = 0, 65 MCA_RECOVERED = 1 66} recovery_status_t; 67 68/* 69 * This pool keeps pointers to the section part of SAL error record 70 */ 71static struct { 72 slidx_list_t *buffer; /* section pointer list pool */ 73 int cur_idx; /* Current index of section pointer list pool */ 74 int max_idx; /* Maximum index of section pointer list pool */ 75} slidx_pool; 76 77static int 78fatal_mca(const char *fmt, ...) 79{ 80 va_list args; 81 char buf[256]; 82 83 va_start(args, fmt); 84 vsnprintf(buf, sizeof(buf), fmt, args); 85 va_end(args); 86 ia64_mca_printk(KERN_ALERT "MCA: %s\n", buf); 87 88 return MCA_NOT_RECOVERED; 89} 90 91static int 92mca_recovered(const char *fmt, ...) 93{ 94 va_list args; 95 char buf[256]; 96 97 va_start(args, fmt); 98 vsnprintf(buf, sizeof(buf), fmt, args); 99 va_end(args); 100 ia64_mca_printk(KERN_INFO "MCA: %s\n", buf); 101 102 return MCA_RECOVERED; 103} 104 105/** 106 * mca_page_isolate - isolate a poisoned page in order not to use it later 107 * @paddr: poisoned memory location 108 * 109 * Return value: 110 * one of isolate_status_t, ISOLATE_OK/NG/NONE. 111 */ 112 113static isolate_status_t 114mca_page_isolate(unsigned long paddr) 115{ 116 int i; 117 struct page *p; 118 119 /* whether physical address is valid or not */ 120 if (!ia64_phys_addr_valid(paddr)) 121 return ISOLATE_NONE; 122 123 if (!pfn_valid(paddr >> PAGE_SHIFT)) 124 return ISOLATE_NONE; 125 126 /* convert physical address to physical page number */ 127 p = pfn_to_page(paddr>>PAGE_SHIFT); 128 129 /* check whether a page number have been already registered or not */ 130 for (i = 0; i < num_page_isolate; i++) 131 if (page_isolate[i] == p) 132 return ISOLATE_OK; /* already listed */ 133 134 /* limitation check */ 135 if (num_page_isolate == MAX_PAGE_ISOLATE) 136 return ISOLATE_NG; 137 138 /* kick pages having attribute 'SLAB' or 'Reserved' */ 139 if (PageSlab(p) || PageReserved(p)) 140 return ISOLATE_NG; 141 142 /* add attribute 'Reserved' and register the page */ 143 get_page(p); 144 SetPageReserved(p); 145 page_isolate[num_page_isolate++] = p; 146 147 return ISOLATE_OK; 148} 149 150/** 151 * mca_hanlder_bh - Kill the process which occurred memory read error 152 * @paddr: poisoned address received from MCA Handler 153 */ 154 155void 156mca_handler_bh(unsigned long paddr, void *iip, unsigned long ipsr) 157{ 158 ia64_mlogbuf_dump(); 159 printk(KERN_ERR "OS_MCA: process [cpu %d, pid: %d, uid: %d, " 160 "iip: %p, psr: 0x%lx,paddr: 0x%lx](%s) encounters MCA.\n", 161 raw_smp_processor_id(), current->pid, current->uid, 162 iip, ipsr, paddr, current->comm); 163 164 spin_lock(&mca_bh_lock); 165 switch (mca_page_isolate(paddr)) { 166 case ISOLATE_OK: 167 printk(KERN_DEBUG "Page isolation: ( %lx ) success.\n", paddr); 168 break; 169 case ISOLATE_NG: 170 printk(KERN_CRIT "Page isolation: ( %lx ) failure.\n", paddr); 171 break; 172 default: 173 break; 174 } 175 spin_unlock(&mca_bh_lock); 176 177 /* This process is about to be killed itself */ 178 do_exit(SIGKILL); 179} 180 181/** 182 * mca_make_peidx - Make index of processor error section 183 * @slpi: pointer to record of processor error section 184 * @peidx: pointer to index of processor error section 185 */ 186 187static void 188mca_make_peidx(sal_log_processor_info_t *slpi, peidx_table_t *peidx) 189{ 190 /* 191 * calculate the start address of 192 * "struct cpuid_info" and "sal_processor_static_info_t". 193 */ 194 u64 total_check_num = slpi->valid.num_cache_check 195 + slpi->valid.num_tlb_check 196 + slpi->valid.num_bus_check 197 + slpi->valid.num_reg_file_check 198 + slpi->valid.num_ms_check; 199 u64 head_size = sizeof(sal_log_mod_error_info_t) * total_check_num 200 + sizeof(sal_log_processor_info_t); 201 u64 mid_size = slpi->valid.cpuid_info * sizeof(struct sal_cpuid_info); 202 203 peidx_head(peidx) = slpi; 204 peidx_mid(peidx) = (struct sal_cpuid_info *) 205 (slpi->valid.cpuid_info ? ((char*)slpi + head_size) : NULL); 206 peidx_bottom(peidx) = (sal_processor_static_info_t *) 207 (slpi->valid.psi_static_struct ? 208 ((char*)slpi + head_size + mid_size) : NULL); 209} 210 211/** 212 * mca_make_slidx - Make index of SAL error record 213 * @buffer: pointer to SAL error record 214 * @slidx: pointer to index of SAL error record 215 * 216 * Return value: 217 * 1 if record has platform error / 0 if not 218 */ 219#define LOG_INDEX_ADD_SECT_PTR(sect, ptr) \ 220 {slidx_list_t *hl = &slidx_pool.buffer[slidx_pool.cur_idx]; \ 221 hl->hdr = ptr; \ 222 list_add(&hl->list, &(sect)); \ 223 slidx_pool.cur_idx = (slidx_pool.cur_idx + 1)%slidx_pool.max_idx; } 224 225static int 226mca_make_slidx(void *buffer, slidx_table_t *slidx) 227{ 228 int platform_err = 0; 229 int record_len = ((sal_log_record_header_t*)buffer)->len; 230 u32 ercd_pos; 231 int sects; 232 sal_log_section_hdr_t *sp; 233 234 /* 235 * Initialize index referring current record 236 */ 237 INIT_LIST_HEAD(&(slidx->proc_err)); 238 INIT_LIST_HEAD(&(slidx->mem_dev_err)); 239 INIT_LIST_HEAD(&(slidx->sel_dev_err)); 240 INIT_LIST_HEAD(&(slidx->pci_bus_err)); 241 INIT_LIST_HEAD(&(slidx->smbios_dev_err)); 242 INIT_LIST_HEAD(&(slidx->pci_comp_err)); 243 INIT_LIST_HEAD(&(slidx->plat_specific_err)); 244 INIT_LIST_HEAD(&(slidx->host_ctlr_err)); 245 INIT_LIST_HEAD(&(slidx->plat_bus_err)); 246 INIT_LIST_HEAD(&(slidx->unsupported)); 247 248 /* 249 * Extract a Record Header 250 */ 251 slidx->header = buffer; 252 253 /* 254 * Extract each section records 255 * (arranged from "int ia64_log_platform_info_print()") 256 */ 257 for (ercd_pos = sizeof(sal_log_record_header_t), sects = 0; 258 ercd_pos < record_len; ercd_pos += sp->len, sects++) { 259 sp = (sal_log_section_hdr_t *)((char*)buffer + ercd_pos); 260 if (!efi_guidcmp(sp->guid, SAL_PROC_DEV_ERR_SECT_GUID)) { 261 LOG_INDEX_ADD_SECT_PTR(slidx->proc_err, sp); 262 } else if (!efi_guidcmp(sp->guid, 263 SAL_PLAT_MEM_DEV_ERR_SECT_GUID)) { 264 platform_err = 1; 265 LOG_INDEX_ADD_SECT_PTR(slidx->mem_dev_err, sp); 266 } else if (!efi_guidcmp(sp->guid, 267 SAL_PLAT_SEL_DEV_ERR_SECT_GUID)) { 268 platform_err = 1; 269 LOG_INDEX_ADD_SECT_PTR(slidx->sel_dev_err, sp); 270 } else if (!efi_guidcmp(sp->guid, 271 SAL_PLAT_PCI_BUS_ERR_SECT_GUID)) { 272 platform_err = 1; 273 LOG_INDEX_ADD_SECT_PTR(slidx->pci_bus_err, sp); 274 } else if (!efi_guidcmp(sp->guid, 275 SAL_PLAT_SMBIOS_DEV_ERR_SECT_GUID)) { 276 platform_err = 1; 277 LOG_INDEX_ADD_SECT_PTR(slidx->smbios_dev_err, sp); 278 } else if (!efi_guidcmp(sp->guid, 279 SAL_PLAT_PCI_COMP_ERR_SECT_GUID)) { 280 platform_err = 1; 281 LOG_INDEX_ADD_SECT_PTR(slidx->pci_comp_err, sp); 282 } else if (!efi_guidcmp(sp->guid, 283 SAL_PLAT_SPECIFIC_ERR_SECT_GUID)) { 284 platform_err = 1; 285 LOG_INDEX_ADD_SECT_PTR(slidx->plat_specific_err, sp); 286 } else if (!efi_guidcmp(sp->guid, 287 SAL_PLAT_HOST_CTLR_ERR_SECT_GUID)) { 288 platform_err = 1; 289 LOG_INDEX_ADD_SECT_PTR(slidx->host_ctlr_err, sp); 290 } else if (!efi_guidcmp(sp->guid, 291 SAL_PLAT_BUS_ERR_SECT_GUID)) { 292 platform_err = 1; 293 LOG_INDEX_ADD_SECT_PTR(slidx->plat_bus_err, sp); 294 } else { 295 LOG_INDEX_ADD_SECT_PTR(slidx->unsupported, sp); 296 } 297 } 298 slidx->n_sections = sects; 299 300 return platform_err; 301} 302 303/** 304 * init_record_index_pools - Initialize pool of lists for SAL record index 305 * 306 * Return value: 307 * 0 on Success / -ENOMEM on Failure 308 */ 309static int 310init_record_index_pools(void) 311{ 312 int i; 313 int rec_max_size; /* Maximum size of SAL error records */ 314 int sect_min_size; /* Minimum size of SAL error sections */ 315 /* minimum size table of each section */ 316 static int sal_log_sect_min_sizes[] = { 317 sizeof(sal_log_processor_info_t) 318 + sizeof(sal_processor_static_info_t), 319 sizeof(sal_log_mem_dev_err_info_t), 320 sizeof(sal_log_sel_dev_err_info_t), 321 sizeof(sal_log_pci_bus_err_info_t), 322 sizeof(sal_log_smbios_dev_err_info_t), 323 sizeof(sal_log_pci_comp_err_info_t), 324 sizeof(sal_log_plat_specific_err_info_t), 325 sizeof(sal_log_host_ctlr_err_info_t), 326 sizeof(sal_log_plat_bus_err_info_t), 327 }; 328 329 /* 330 * MCA handler cannot allocate new memory on flight, 331 * so we preallocate enough memory to handle a SAL record. 332 * 333 * Initialize a handling set of slidx_pool: 334 * 1. Pick up the max size of SAL error records 335 * 2. Pick up the min size of SAL error sections 336 * 3. Allocate the pool as enough to 2 SAL records 337 * (now we can estimate the maxinum of section in a record.) 338 */ 339 340 /* - 1 - */ 341 rec_max_size = sal_rec_max; 342 343 /* - 2 - */ 344 sect_min_size = sal_log_sect_min_sizes[0]; 345 for (i = 1; i < sizeof sal_log_sect_min_sizes/sizeof(size_t); i++) 346 if (sect_min_size > sal_log_sect_min_sizes[i]) 347 sect_min_size = sal_log_sect_min_sizes[i]; 348 349 /* - 3 - */ 350 slidx_pool.max_idx = (rec_max_size/sect_min_size) * 2 + 1; 351 slidx_pool.buffer = (slidx_list_t *) 352 kmalloc(slidx_pool.max_idx * sizeof(slidx_list_t), GFP_KERNEL); 353 354 return slidx_pool.buffer ? 0 : -ENOMEM; 355} 356 357 358/***************************************************************************** 359 * Recovery functions * 360 *****************************************************************************/ 361 362/** 363 * is_mca_global - Check whether this MCA is global or not 364 * @peidx: pointer of index of processor error section 365 * @pbci: pointer to pal_bus_check_info_t 366 * @sos: pointer to hand off struct between SAL and OS 367 * 368 * Return value: 369 * MCA_IS_LOCAL / MCA_IS_GLOBAL 370 */ 371 372static mca_type_t 373is_mca_global(peidx_table_t *peidx, pal_bus_check_info_t *pbci, 374 struct ia64_sal_os_state *sos) 375{ 376 pal_processor_state_info_t *psp = 377 (pal_processor_state_info_t*)peidx_psp(peidx); 378 379 /* 380 * PAL can request a rendezvous, if the MCA has a global scope. 381 * If "rz_always" flag is set, SAL requests MCA rendezvous 382 * in spite of global MCA. 383 * Therefore it is local MCA when rendezvous has not been requested. 384 * Failed to rendezvous, the system must be down. 385 */ 386 switch (sos->rv_rc) { 387 case -1: /* SAL rendezvous unsuccessful */ 388 return MCA_IS_GLOBAL; 389 case 0: /* SAL rendezvous not required */ 390 return MCA_IS_LOCAL; 391 case 1: /* SAL rendezvous successful int */ 392 case 2: /* SAL rendezvous successful int with init */ 393 default: 394 break; 395 } 396 397 /* 398 * If One or more Cache/TLB/Reg_File/Uarch_Check is here, 399 * it would be a local MCA. (i.e. processor internal error) 400 */ 401 if (psp->tc || psp->cc || psp->rc || psp->uc) 402 return MCA_IS_LOCAL; 403 404 /* 405 * Bus_Check structure with Bus_Check.ib (internal bus error) flag set 406 * would be a global MCA. (e.g. a system bus address parity error) 407 */ 408 if (!pbci || pbci->ib) 409 return MCA_IS_GLOBAL; 410 411 if (pbci->eb) 412 switch (pbci->bsi) { 413 case 0: 414 /* e.g. a load from poisoned memory */ 415 return MCA_IS_LOCAL; 416 case 1: 417 case 2: 418 case 3: 419 return MCA_IS_GLOBAL; 420 } 421 422 return MCA_IS_GLOBAL; 423} 424 425/** 426 * get_target_identifier - Get the valid Cache or Bus check target identifier. 427 * @peidx: pointer of index of processor error section 428 * 429 * Return value: 430 * target address on Success / 0 on Failure 431 */ 432static u64 433get_target_identifier(peidx_table_t *peidx) 434{ 435 u64 target_address = 0; 436 sal_log_mod_error_info_t *smei; 437 pal_cache_check_info_t *pcci; 438 int i, level = 9; 439 440 /* 441 * Look through the cache checks for a valid target identifier 442 * If more than one valid target identifier, return the one 443 * with the lowest cache level. 444 */ 445 for (i = 0; i < peidx_cache_check_num(peidx); i++) { 446 smei = (sal_log_mod_error_info_t *)peidx_cache_check(peidx, i); 447 if (smei->valid.target_identifier && smei->target_identifier) { 448 pcci = (pal_cache_check_info_t *)&(smei->check_info); 449 if (!target_address || (pcci->level < level)) { 450 target_address = smei->target_identifier; 451 level = pcci->level; 452 continue; 453 } 454 } 455 } 456 if (target_address) 457 return target_address; 458 459 /* 460 * Look at the bus check for a valid target identifier 461 */ 462 smei = peidx_bus_check(peidx, 0); 463 if (smei && smei->valid.target_identifier) 464 return smei->target_identifier; 465 466 return 0; 467} 468 469/** 470 * recover_from_read_error - Try to recover the errors which type are "read"s. 471 * @slidx: pointer of index of SAL error record 472 * @peidx: pointer of index of processor error section 473 * @pbci: pointer of pal_bus_check_info 474 * @sos: pointer to hand off struct between SAL and OS 475 * 476 * Return value: 477 * 1 on Success / 0 on Failure 478 */ 479 480static int 481recover_from_read_error(slidx_table_t *slidx, 482 peidx_table_t *peidx, pal_bus_check_info_t *pbci, 483 struct ia64_sal_os_state *sos) 484{ 485 u64 target_identifier; 486 pal_min_state_area_t *pmsa; 487 struct ia64_psr *psr1, *psr2; 488 ia64_fptr_t *mca_hdlr_bh = (ia64_fptr_t*)mca_handler_bhhook; 489 490 /* Is target address valid? */ 491 target_identifier = get_target_identifier(peidx); 492 if (!target_identifier) 493 return fatal_mca("target address not valid"); 494 495 /* 496 * cpu read or memory-mapped io read 497 * 498 * offending process affected process OS MCA do 499 * kernel mode kernel mode down system 500 * kernel mode user mode kill the process 501 * user mode kernel mode down system (*) 502 * user mode user mode kill the process 503 * 504 * (*) You could terminate offending user-mode process 505 * if (pbci->pv && pbci->pl != 0) *and* if you sure 506 * the process not have any locks of kernel. 507 */ 508 509 /* Is minstate valid? */ 510 if (!peidx_bottom(peidx) || !(peidx_bottom(peidx)->valid.minstate)) 511 return fatal_mca("minstate not valid"); 512 psr1 =(struct ia64_psr *)&(peidx_minstate_area(peidx)->pmsa_ipsr); 513 psr2 =(struct ia64_psr *)&(peidx_minstate_area(peidx)->pmsa_xpsr); 514 515 /* 516 * Check the privilege level of interrupted context. 517 * If it is user-mode, then terminate affected process. 518 */ 519 520 pmsa = sos->pal_min_state; 521 if (psr1->cpl != 0 || 522 ((psr2->cpl != 0) && mca_recover_range(pmsa->pmsa_iip))) { 523 /* 524 * setup for resume to bottom half of MCA, 525 * "mca_handler_bhhook" 526 */ 527 /* pass to bhhook as argument (gr8, ...) */ 528 pmsa->pmsa_gr[8-1] = target_identifier; 529 pmsa->pmsa_gr[9-1] = pmsa->pmsa_iip; 530 pmsa->pmsa_gr[10-1] = pmsa->pmsa_ipsr; 531 /* set interrupted return address (but no use) */ 532 pmsa->pmsa_br0 = pmsa->pmsa_iip; 533 /* change resume address to bottom half */ 534 pmsa->pmsa_iip = mca_hdlr_bh->fp; 535 pmsa->pmsa_gr[1-1] = mca_hdlr_bh->gp; 536 /* set cpl with kernel mode */ 537 psr2 = (struct ia64_psr *)&pmsa->pmsa_ipsr; 538 psr2->cpl = 0; 539 psr2->ri = 0; 540 psr2->bn = 1; 541 psr2->i = 0; 542 543 return mca_recovered("user memory corruption. " 544 "kill affected process - recovered."); 545 } 546 547 return fatal_mca("kernel context not recovered, iip 0x%lx\n", 548 pmsa->pmsa_iip); 549} 550 551/** 552 * recover_from_platform_error - Recover from platform error. 553 * @slidx: pointer of index of SAL error record 554 * @peidx: pointer of index of processor error section 555 * @pbci: pointer of pal_bus_check_info 556 * @sos: pointer to hand off struct between SAL and OS 557 * 558 * Return value: 559 * 1 on Success / 0 on Failure 560 */ 561 562static int 563recover_from_platform_error(slidx_table_t *slidx, peidx_table_t *peidx, 564 pal_bus_check_info_t *pbci, 565 struct ia64_sal_os_state *sos) 566{ 567 int status = 0; 568 pal_processor_state_info_t *psp = 569 (pal_processor_state_info_t*)peidx_psp(peidx); 570 571 if (psp->bc && pbci->eb && pbci->bsi == 0) { 572 switch(pbci->type) { 573 case 1: /* partial read */ 574 case 3: /* full line(cpu) read */ 575 case 9: /* I/O space read */ 576 status = recover_from_read_error(slidx, peidx, pbci, 577 sos); 578 break; 579 case 0: /* unknown */ 580 case 2: /* partial write */ 581 case 4: /* full line write */ 582 case 5: /* implicit or explicit write-back operation */ 583 case 6: /* snoop probe */ 584 case 7: /* incoming or outgoing ptc.g */ 585 case 8: /* write coalescing transactions */ 586 case 10: /* I/O space write */ 587 case 11: /* inter-processor interrupt message(IPI) */ 588 case 12: /* interrupt acknowledge or 589 external task priority cycle */ 590 default: 591 break; 592 } 593 } else if (psp->cc && !psp->bc) { /* Cache error */ 594 status = recover_from_read_error(slidx, peidx, pbci, sos); 595 } 596 597 return status; 598} 599 600/* 601 * recover_from_tlb_check 602 * @peidx: pointer of index of processor error section 603 * 604 * Return value: 605 * 1 on Success / 0 on Failure 606 */ 607static int 608recover_from_tlb_check(peidx_table_t *peidx) 609{ 610 sal_log_mod_error_info_t *smei; 611 pal_tlb_check_info_t *ptci; 612 613 smei = (sal_log_mod_error_info_t *)peidx_tlb_check(peidx, 0); 614 ptci = (pal_tlb_check_info_t *)&(smei->check_info); 615 616 /* 617 * Look for signature of a duplicate TLB DTC entry, which is 618 * a SW bug and always fatal. 619 */ 620 if (ptci->op == PAL_TLB_CHECK_OP_PURGE 621 && !(ptci->itr || ptci->dtc || ptci->itc)) 622 return fatal_mca("Duplicate TLB entry"); 623 624 return mca_recovered("TLB check recovered"); 625} 626 627/** 628 * recover_from_processor_error 629 * @platform: whether there are some platform error section or not 630 * @slidx: pointer of index of SAL error record 631 * @peidx: pointer of index of processor error section 632 * @pbci: pointer of pal_bus_check_info 633 * @sos: pointer to hand off struct between SAL and OS 634 * 635 * Return value: 636 * 1 on Success / 0 on Failure 637 */ 638 639static int 640recover_from_processor_error(int platform, slidx_table_t *slidx, 641 peidx_table_t *peidx, pal_bus_check_info_t *pbci, 642 struct ia64_sal_os_state *sos) 643{ 644 pal_processor_state_info_t *psp = 645 (pal_processor_state_info_t*)peidx_psp(peidx); 646 647 /* 648 * Processor recovery status must key off of the PAL recovery 649 * status in the Processor State Parameter. 650 */ 651 652 /* 653 * The machine check is corrected. 654 */ 655 if (psp->cm == 1) 656 return mca_recovered("machine check is already corrected."); 657 658 /* 659 * The error was not contained. Software must be reset. 660 */ 661 if (psp->us || psp->ci == 0) 662 return fatal_mca("error not contained"); 663 664 /* 665 * Look for recoverable TLB check 666 */ 667 if (psp->tc && !(psp->cc || psp->bc || psp->rc || psp->uc)) 668 return recover_from_tlb_check(peidx); 669 670 /* 671 * The cache check and bus check bits have four possible states 672 * cc bc 673 * 1 1 Memory error, attempt recovery 674 * 1 0 Cache error, attempt recovery 675 * 0 1 I/O error, attempt recovery 676 * 0 0 Other error type, not recovered 677 */ 678 if (psp->cc == 0 && (psp->bc == 0 || pbci == NULL)) 679 return fatal_mca("No cache or bus check"); 680 681 /* 682 * Cannot handle more than one bus check. 683 */ 684 if (peidx_bus_check_num(peidx) > 1) 685 return fatal_mca("Too many bus checks"); 686 687 if (pbci->ib) 688 return fatal_mca("Internal Bus error"); 689 if (pbci->eb && pbci->bsi > 0) 690 return fatal_mca("External bus check fatal status"); 691 692 /* 693 * This is a local MCA and estimated as a recoverable error. 694 */ 695 if (platform) 696 return recover_from_platform_error(slidx, peidx, pbci, sos); 697 698 /* 699 * On account of strange SAL error record, we cannot recover. 700 */ 701 return fatal_mca("Strange SAL record"); 702} 703 704/** 705 * mca_try_to_recover - Try to recover from MCA 706 * @rec: pointer to a SAL error record 707 * @sos: pointer to hand off struct between SAL and OS 708 * 709 * Return value: 710 * 1 on Success / 0 on Failure 711 */ 712 713static int 714mca_try_to_recover(void *rec, struct ia64_sal_os_state *sos) 715{ 716 int platform_err; 717 int n_proc_err; 718 slidx_table_t slidx; 719 peidx_table_t peidx; 720 pal_bus_check_info_t pbci; 721 722 /* Make index of SAL error record */ 723 platform_err = mca_make_slidx(rec, &slidx); 724 725 /* Count processor error sections */ 726 n_proc_err = slidx_count(&slidx, proc_err); 727 728 /* Now, OS can recover when there is one processor error section */ 729 if (n_proc_err > 1) 730 return fatal_mca("Too Many Errors"); 731 else if (n_proc_err == 0) 732 /* Weird SAL record ... We can't do anything */ 733 return fatal_mca("Weird SAL record"); 734 735 /* Make index of processor error section */ 736 mca_make_peidx((sal_log_processor_info_t*) 737 slidx_first_entry(&slidx.proc_err)->hdr, &peidx); 738 739 /* Extract Processor BUS_CHECK[0] */ 740 *((u64*)&pbci) = peidx_check_info(&peidx, bus_check, 0); 741 742 /* Check whether MCA is global or not */ 743 if (is_mca_global(&peidx, &pbci, sos)) 744 return fatal_mca("global MCA"); 745 746 /* Try to recover a processor error */ 747 return recover_from_processor_error(platform_err, &slidx, &peidx, 748 &pbci, sos); 749} 750 751/* 752 * ============================================================================= 753 */ 754 755int __init mca_external_handler_init(void) 756{ 757 if (init_record_index_pools()) 758 return -ENOMEM; 759 760 /* register external mca handlers */ 761 if (ia64_reg_MCA_extension(mca_try_to_recover)) { 762 printk(KERN_ERR "ia64_reg_MCA_extension failed.\n"); 763 kfree(slidx_pool.buffer); 764 return -EFAULT; 765 } 766 return 0; 767} 768 769void __exit mca_external_handler_exit(void) 770{ 771 /* unregister external mca handlers */ 772 ia64_unreg_MCA_extension(); 773 kfree(slidx_pool.buffer); 774} 775 776module_init(mca_external_handler_init); 777module_exit(mca_external_handler_exit); 778 779module_param(sal_rec_max, int, 0644); 780MODULE_PARM_DESC(sal_rec_max, "Max size of SAL error record"); 781 782MODULE_DESCRIPTION("ia64 platform dependent mca handler driver"); 783MODULE_LICENSE("GPL"); 784