1 /* 2 * File: mca_drv.c 3 * Purpose: Generic MCA handling layer 4 * 5 * Copyright (C) 2004 FUJITSU LIMITED 6 * Copyright (C) 2004 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/memblock.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 #include <linux/slab.h> 26 27 #include <asm/delay.h> 28 #include <asm/machvec.h> 29 #include <asm/page.h> 30 #include <asm/ptrace.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) */ 40 static int sal_rec_max = 10000; 41 42 /* from mca_drv_asm.S */ 43 extern void *mca_handler_bhhook(void); 44 45 static DEFINE_SPINLOCK(mca_bh_lock); 46 47 typedef enum { 48 MCA_IS_LOCAL = 0, 49 MCA_IS_GLOBAL = 1 50 } mca_type_t; 51 52 #define MAX_PAGE_ISOLATE 1024 53 54 static struct page *page_isolate[MAX_PAGE_ISOLATE]; 55 static int num_page_isolate = 0; 56 57 typedef enum { 58 ISOLATE_NG, 59 ISOLATE_OK, 60 ISOLATE_NONE 61 } isolate_status_t; 62 63 typedef 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 */ 71 static 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 77 static int 78 fatal_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 91 static int 92 mca_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 */ 112 113 static isolate_status_t 114 mca_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 */ 154 155 void 156 mca_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, 162 from_kuid(&init_user_ns, current_uid()), 163 iip, ipsr, paddr, current->comm); 164 165 spin_lock(&mca_bh_lock); 166 switch (mca_page_isolate(paddr)) { 167 case ISOLATE_OK: 168 printk(KERN_DEBUG "Page isolation: ( %lx ) success.\n", paddr); 169 break; 170 case ISOLATE_NG: 171 printk(KERN_CRIT "Page isolation: ( %lx ) failure.\n", paddr); 172 break; 173 default: 174 break; 175 } 176 spin_unlock(&mca_bh_lock); 177 178 /* This process is about to be killed itself */ 179 do_exit(SIGKILL); 180 } 181 182 /** 183 * mca_make_peidx - Make index of processor error section 184 * @slpi: pointer to record of processor error section 185 * @peidx: pointer to index of processor error section 186 */ 187 188 static void 189 mca_make_peidx(sal_log_processor_info_t *slpi, peidx_table_t *peidx) 190 { 191 /* 192 * calculate the start address of 193 * "struct cpuid_info" and "sal_processor_static_info_t". 194 */ 195 u64 total_check_num = slpi->valid.num_cache_check 196 + slpi->valid.num_tlb_check 197 + slpi->valid.num_bus_check 198 + slpi->valid.num_reg_file_check 199 + slpi->valid.num_ms_check; 200 u64 head_size = sizeof(sal_log_mod_error_info_t) * total_check_num 201 + sizeof(sal_log_processor_info_t); 202 u64 mid_size = slpi->valid.cpuid_info * sizeof(struct sal_cpuid_info); 203 204 peidx_head(peidx) = slpi; 205 peidx_mid(peidx) = (struct sal_cpuid_info *) 206 (slpi->valid.cpuid_info ? ((char*)slpi + head_size) : NULL); 207 peidx_bottom(peidx) = (sal_processor_static_info_t *) 208 (slpi->valid.psi_static_struct ? 209 ((char*)slpi + head_size + mid_size) : NULL); 210 } 211 212 /** 213 * mca_make_slidx - Make index of SAL error record 214 * @buffer: pointer to SAL error record 215 * @slidx: pointer to index of SAL error record 216 * 217 * Return value: 218 * 1 if record has platform error / 0 if not 219 */ 220 #define LOG_INDEX_ADD_SECT_PTR(sect, ptr) \ 221 {slidx_list_t *hl = &slidx_pool.buffer[slidx_pool.cur_idx]; \ 222 hl->hdr = ptr; \ 223 list_add(&hl->list, &(sect)); \ 224 slidx_pool.cur_idx = (slidx_pool.cur_idx + 1)%slidx_pool.max_idx; } 225 226 static int 227 mca_make_slidx(void *buffer, slidx_table_t *slidx) 228 { 229 int platform_err = 0; 230 int record_len = ((sal_log_record_header_t*)buffer)->len; 231 u32 ercd_pos; 232 int sects; 233 sal_log_section_hdr_t *sp; 234 235 /* 236 * Initialize index referring current record 237 */ 238 INIT_LIST_HEAD(&(slidx->proc_err)); 239 INIT_LIST_HEAD(&(slidx->mem_dev_err)); 240 INIT_LIST_HEAD(&(slidx->sel_dev_err)); 241 INIT_LIST_HEAD(&(slidx->pci_bus_err)); 242 INIT_LIST_HEAD(&(slidx->smbios_dev_err)); 243 INIT_LIST_HEAD(&(slidx->pci_comp_err)); 244 INIT_LIST_HEAD(&(slidx->plat_specific_err)); 245 INIT_LIST_HEAD(&(slidx->host_ctlr_err)); 246 INIT_LIST_HEAD(&(slidx->plat_bus_err)); 247 INIT_LIST_HEAD(&(slidx->unsupported)); 248 249 /* 250 * Extract a Record Header 251 */ 252 slidx->header = buffer; 253 254 /* 255 * Extract each section records 256 * (arranged from "int ia64_log_platform_info_print()") 257 */ 258 for (ercd_pos = sizeof(sal_log_record_header_t), sects = 0; 259 ercd_pos < record_len; ercd_pos += sp->len, sects++) { 260 sp = (sal_log_section_hdr_t *)((char*)buffer + ercd_pos); 261 if (!efi_guidcmp(sp->guid, SAL_PROC_DEV_ERR_SECT_GUID)) { 262 LOG_INDEX_ADD_SECT_PTR(slidx->proc_err, sp); 263 } else if (!efi_guidcmp(sp->guid, 264 SAL_PLAT_MEM_DEV_ERR_SECT_GUID)) { 265 platform_err = 1; 266 LOG_INDEX_ADD_SECT_PTR(slidx->mem_dev_err, sp); 267 } else if (!efi_guidcmp(sp->guid, 268 SAL_PLAT_SEL_DEV_ERR_SECT_GUID)) { 269 platform_err = 1; 270 LOG_INDEX_ADD_SECT_PTR(slidx->sel_dev_err, sp); 271 } else if (!efi_guidcmp(sp->guid, 272 SAL_PLAT_PCI_BUS_ERR_SECT_GUID)) { 273 platform_err = 1; 274 LOG_INDEX_ADD_SECT_PTR(slidx->pci_bus_err, sp); 275 } else if (!efi_guidcmp(sp->guid, 276 SAL_PLAT_SMBIOS_DEV_ERR_SECT_GUID)) { 277 platform_err = 1; 278 LOG_INDEX_ADD_SECT_PTR(slidx->smbios_dev_err, sp); 279 } else if (!efi_guidcmp(sp->guid, 280 SAL_PLAT_PCI_COMP_ERR_SECT_GUID)) { 281 platform_err = 1; 282 LOG_INDEX_ADD_SECT_PTR(slidx->pci_comp_err, sp); 283 } else if (!efi_guidcmp(sp->guid, 284 SAL_PLAT_SPECIFIC_ERR_SECT_GUID)) { 285 platform_err = 1; 286 LOG_INDEX_ADD_SECT_PTR(slidx->plat_specific_err, sp); 287 } else if (!efi_guidcmp(sp->guid, 288 SAL_PLAT_HOST_CTLR_ERR_SECT_GUID)) { 289 platform_err = 1; 290 LOG_INDEX_ADD_SECT_PTR(slidx->host_ctlr_err, sp); 291 } else if (!efi_guidcmp(sp->guid, 292 SAL_PLAT_BUS_ERR_SECT_GUID)) { 293 platform_err = 1; 294 LOG_INDEX_ADD_SECT_PTR(slidx->plat_bus_err, sp); 295 } else { 296 LOG_INDEX_ADD_SECT_PTR(slidx->unsupported, sp); 297 } 298 } 299 slidx->n_sections = sects; 300 301 return platform_err; 302 } 303 304 /** 305 * init_record_index_pools - Initialize pool of lists for SAL record index 306 * 307 * Return value: 308 * 0 on Success / -ENOMEM on Failure 309 */ 310 static int 311 init_record_index_pools(void) 312 { 313 int i; 314 int rec_max_size; /* Maximum size of SAL error records */ 315 int sect_min_size; /* Minimum size of SAL error sections */ 316 /* minimum size table of each section */ 317 static int sal_log_sect_min_sizes[] = { 318 sizeof(sal_log_processor_info_t) 319 + sizeof(sal_processor_static_info_t), 320 sizeof(sal_log_mem_dev_err_info_t), 321 sizeof(sal_log_sel_dev_err_info_t), 322 sizeof(sal_log_pci_bus_err_info_t), 323 sizeof(sal_log_smbios_dev_err_info_t), 324 sizeof(sal_log_pci_comp_err_info_t), 325 sizeof(sal_log_plat_specific_err_info_t), 326 sizeof(sal_log_host_ctlr_err_info_t), 327 sizeof(sal_log_plat_bus_err_info_t), 328 }; 329 330 /* 331 * MCA handler cannot allocate new memory on flight, 332 * so we preallocate enough memory to handle a SAL record. 333 * 334 * Initialize a handling set of slidx_pool: 335 * 1. Pick up the max size of SAL error records 336 * 2. Pick up the min size of SAL error sections 337 * 3. Allocate the pool as enough to 2 SAL records 338 * (now we can estimate the maxinum of section in a record.) 339 */ 340 341 /* - 1 - */ 342 rec_max_size = sal_rec_max; 343 344 /* - 2 - */ 345 sect_min_size = sal_log_sect_min_sizes[0]; 346 for (i = 1; i < sizeof sal_log_sect_min_sizes/sizeof(size_t); i++) 347 if (sect_min_size > sal_log_sect_min_sizes[i]) 348 sect_min_size = sal_log_sect_min_sizes[i]; 349 350 /* - 3 - */ 351 slidx_pool.max_idx = (rec_max_size/sect_min_size) * 2 + 1; 352 slidx_pool.buffer = 353 kmalloc_array(slidx_pool.max_idx, sizeof(slidx_list_t), 354 GFP_KERNEL); 355 356 return slidx_pool.buffer ? 0 : -ENOMEM; 357 } 358 359 360 /***************************************************************************** 361 * Recovery functions * 362 *****************************************************************************/ 363 364 /** 365 * is_mca_global - Check whether this MCA is global or not 366 * @peidx: pointer of index of processor error section 367 * @pbci: pointer to pal_bus_check_info_t 368 * @sos: pointer to hand off struct between SAL and OS 369 * 370 * Return value: 371 * MCA_IS_LOCAL / MCA_IS_GLOBAL 372 */ 373 374 static mca_type_t 375 is_mca_global(peidx_table_t *peidx, pal_bus_check_info_t *pbci, 376 struct ia64_sal_os_state *sos) 377 { 378 pal_processor_state_info_t *psp = 379 (pal_processor_state_info_t*)peidx_psp(peidx); 380 381 /* 382 * PAL can request a rendezvous, if the MCA has a global scope. 383 * If "rz_always" flag is set, SAL requests MCA rendezvous 384 * in spite of global MCA. 385 * Therefore it is local MCA when rendezvous has not been requested. 386 * Failed to rendezvous, the system must be down. 387 */ 388 switch (sos->rv_rc) { 389 case -1: /* SAL rendezvous unsuccessful */ 390 return MCA_IS_GLOBAL; 391 case 0: /* SAL rendezvous not required */ 392 return MCA_IS_LOCAL; 393 case 1: /* SAL rendezvous successful int */ 394 case 2: /* SAL rendezvous successful int with init */ 395 default: 396 break; 397 } 398 399 /* 400 * If One or more Cache/TLB/Reg_File/Uarch_Check is here, 401 * it would be a local MCA. (i.e. processor internal error) 402 */ 403 if (psp->tc || psp->cc || psp->rc || psp->uc) 404 return MCA_IS_LOCAL; 405 406 /* 407 * Bus_Check structure with Bus_Check.ib (internal bus error) flag set 408 * would be a global MCA. (e.g. a system bus address parity error) 409 */ 410 if (!pbci || pbci->ib) 411 return MCA_IS_GLOBAL; 412 413 /* 414 * Bus_Check structure with Bus_Check.eb (external bus error) flag set 415 * could be either a local MCA or a global MCA. 416 * 417 * Referring Bus_Check.bsi: 418 * 0: Unknown/unclassified 419 * 1: BERR# 420 * 2: BINIT# 421 * 3: Hard Fail 422 * (FIXME: Are these SGI specific or generic bsi values?) 423 */ 424 if (pbci->eb) 425 switch (pbci->bsi) { 426 case 0: 427 /* e.g. a load from poisoned memory */ 428 return MCA_IS_LOCAL; 429 case 1: 430 case 2: 431 case 3: 432 return MCA_IS_GLOBAL; 433 } 434 435 return MCA_IS_GLOBAL; 436 } 437 438 /** 439 * get_target_identifier - Get the valid Cache or Bus check target identifier. 440 * @peidx: pointer of index of processor error section 441 * 442 * Return value: 443 * target address on Success / 0 on Failure 444 */ 445 static u64 446 get_target_identifier(peidx_table_t *peidx) 447 { 448 u64 target_address = 0; 449 sal_log_mod_error_info_t *smei; 450 pal_cache_check_info_t *pcci; 451 int i, level = 9; 452 453 /* 454 * Look through the cache checks for a valid target identifier 455 * If more than one valid target identifier, return the one 456 * with the lowest cache level. 457 */ 458 for (i = 0; i < peidx_cache_check_num(peidx); i++) { 459 smei = (sal_log_mod_error_info_t *)peidx_cache_check(peidx, i); 460 if (smei->valid.target_identifier && smei->target_identifier) { 461 pcci = (pal_cache_check_info_t *)&(smei->check_info); 462 if (!target_address || (pcci->level < level)) { 463 target_address = smei->target_identifier; 464 level = pcci->level; 465 continue; 466 } 467 } 468 } 469 if (target_address) 470 return target_address; 471 472 /* 473 * Look at the bus check for a valid target identifier 474 */ 475 smei = peidx_bus_check(peidx, 0); 476 if (smei && smei->valid.target_identifier) 477 return smei->target_identifier; 478 479 return 0; 480 } 481 482 /** 483 * recover_from_read_error - Try to recover the errors which type are "read"s. 484 * @slidx: pointer of index of SAL error record 485 * @peidx: pointer of index of processor error section 486 * @pbci: pointer of pal_bus_check_info 487 * @sos: pointer to hand off struct between SAL and OS 488 * 489 * Return value: 490 * 1 on Success / 0 on Failure 491 */ 492 493 static int 494 recover_from_read_error(slidx_table_t *slidx, 495 peidx_table_t *peidx, pal_bus_check_info_t *pbci, 496 struct ia64_sal_os_state *sos) 497 { 498 u64 target_identifier; 499 pal_min_state_area_t *pmsa; 500 struct ia64_psr *psr1, *psr2; 501 ia64_fptr_t *mca_hdlr_bh = (ia64_fptr_t*)mca_handler_bhhook; 502 503 /* Is target address valid? */ 504 target_identifier = get_target_identifier(peidx); 505 if (!target_identifier) 506 return fatal_mca("target address not valid"); 507 508 /* 509 * cpu read or memory-mapped io read 510 * 511 * offending process affected process OS MCA do 512 * kernel mode kernel mode down system 513 * kernel mode user mode kill the process 514 * user mode kernel mode down system (*) 515 * user mode user mode kill the process 516 * 517 * (*) You could terminate offending user-mode process 518 * if (pbci->pv && pbci->pl != 0) *and* if you sure 519 * the process not have any locks of kernel. 520 */ 521 522 /* Is minstate valid? */ 523 if (!peidx_bottom(peidx) || !(peidx_bottom(peidx)->valid.minstate)) 524 return fatal_mca("minstate not valid"); 525 psr1 =(struct ia64_psr *)&(peidx_minstate_area(peidx)->pmsa_ipsr); 526 psr2 =(struct ia64_psr *)&(peidx_minstate_area(peidx)->pmsa_xpsr); 527 528 /* 529 * Check the privilege level of interrupted context. 530 * If it is user-mode, then terminate affected process. 531 */ 532 533 pmsa = sos->pal_min_state; 534 if (psr1->cpl != 0 || 535 ((psr2->cpl != 0) && mca_recover_range(pmsa->pmsa_iip))) { 536 /* 537 * setup for resume to bottom half of MCA, 538 * "mca_handler_bhhook" 539 */ 540 /* pass to bhhook as argument (gr8, ...) */ 541 pmsa->pmsa_gr[8-1] = target_identifier; 542 pmsa->pmsa_gr[9-1] = pmsa->pmsa_iip; 543 pmsa->pmsa_gr[10-1] = pmsa->pmsa_ipsr; 544 /* set interrupted return address (but no use) */ 545 pmsa->pmsa_br0 = pmsa->pmsa_iip; 546 /* change resume address to bottom half */ 547 pmsa->pmsa_iip = mca_hdlr_bh->fp; 548 pmsa->pmsa_gr[1-1] = mca_hdlr_bh->gp; 549 /* set cpl with kernel mode */ 550 psr2 = (struct ia64_psr *)&pmsa->pmsa_ipsr; 551 psr2->cpl = 0; 552 psr2->ri = 0; 553 psr2->bn = 1; 554 psr2->i = 0; 555 556 return mca_recovered("user memory corruption. " 557 "kill affected process - recovered."); 558 } 559 560 return fatal_mca("kernel context not recovered, iip 0x%lx\n", 561 pmsa->pmsa_iip); 562 } 563 564 /** 565 * recover_from_platform_error - Recover from platform error. 566 * @slidx: pointer of index of SAL error record 567 * @peidx: pointer of index of processor error section 568 * @pbci: pointer of pal_bus_check_info 569 * @sos: pointer to hand off struct between SAL and OS 570 * 571 * Return value: 572 * 1 on Success / 0 on Failure 573 */ 574 575 static int 576 recover_from_platform_error(slidx_table_t *slidx, peidx_table_t *peidx, 577 pal_bus_check_info_t *pbci, 578 struct ia64_sal_os_state *sos) 579 { 580 int status = 0; 581 pal_processor_state_info_t *psp = 582 (pal_processor_state_info_t*)peidx_psp(peidx); 583 584 if (psp->bc && pbci->eb && pbci->bsi == 0) { 585 switch(pbci->type) { 586 case 1: /* partial read */ 587 case 3: /* full line(cpu) read */ 588 case 9: /* I/O space read */ 589 status = recover_from_read_error(slidx, peidx, pbci, 590 sos); 591 break; 592 case 0: /* unknown */ 593 case 2: /* partial write */ 594 case 4: /* full line write */ 595 case 5: /* implicit or explicit write-back operation */ 596 case 6: /* snoop probe */ 597 case 7: /* incoming or outgoing ptc.g */ 598 case 8: /* write coalescing transactions */ 599 case 10: /* I/O space write */ 600 case 11: /* inter-processor interrupt message(IPI) */ 601 case 12: /* interrupt acknowledge or 602 external task priority cycle */ 603 default: 604 break; 605 } 606 } else if (psp->cc && !psp->bc) { /* Cache error */ 607 status = recover_from_read_error(slidx, peidx, pbci, sos); 608 } 609 610 return status; 611 } 612 613 /* 614 * recover_from_tlb_check 615 * @peidx: pointer of index of processor error section 616 * 617 * Return value: 618 * 1 on Success / 0 on Failure 619 */ 620 static int 621 recover_from_tlb_check(peidx_table_t *peidx) 622 { 623 sal_log_mod_error_info_t *smei; 624 pal_tlb_check_info_t *ptci; 625 626 smei = (sal_log_mod_error_info_t *)peidx_tlb_check(peidx, 0); 627 ptci = (pal_tlb_check_info_t *)&(smei->check_info); 628 629 /* 630 * Look for signature of a duplicate TLB DTC entry, which is 631 * a SW bug and always fatal. 632 */ 633 if (ptci->op == PAL_TLB_CHECK_OP_PURGE 634 && !(ptci->itr || ptci->dtc || ptci->itc)) 635 return fatal_mca("Duplicate TLB entry"); 636 637 return mca_recovered("TLB check recovered"); 638 } 639 640 /** 641 * recover_from_processor_error 642 * @platform: whether there are some platform error section or not 643 * @slidx: pointer of index of SAL error record 644 * @peidx: pointer of index of processor error section 645 * @pbci: pointer of pal_bus_check_info 646 * @sos: pointer to hand off struct between SAL and OS 647 * 648 * Return value: 649 * 1 on Success / 0 on Failure 650 */ 651 652 static int 653 recover_from_processor_error(int platform, slidx_table_t *slidx, 654 peidx_table_t *peidx, pal_bus_check_info_t *pbci, 655 struct ia64_sal_os_state *sos) 656 { 657 pal_processor_state_info_t *psp = 658 (pal_processor_state_info_t*)peidx_psp(peidx); 659 660 /* 661 * Processor recovery status must key off of the PAL recovery 662 * status in the Processor State Parameter. 663 */ 664 665 /* 666 * The machine check is corrected. 667 */ 668 if (psp->cm == 1) 669 return mca_recovered("machine check is already corrected."); 670 671 /* 672 * The error was not contained. Software must be reset. 673 */ 674 if (psp->us || psp->ci == 0) 675 return fatal_mca("error not contained"); 676 677 /* 678 * Look for recoverable TLB check 679 */ 680 if (psp->tc && !(psp->cc || psp->bc || psp->rc || psp->uc)) 681 return recover_from_tlb_check(peidx); 682 683 /* 684 * The cache check and bus check bits have four possible states 685 * cc bc 686 * 1 1 Memory error, attempt recovery 687 * 1 0 Cache error, attempt recovery 688 * 0 1 I/O error, attempt recovery 689 * 0 0 Other error type, not recovered 690 */ 691 if (psp->cc == 0 && (psp->bc == 0 || pbci == NULL)) 692 return fatal_mca("No cache or bus check"); 693 694 /* 695 * Cannot handle more than one bus check. 696 */ 697 if (peidx_bus_check_num(peidx) > 1) 698 return fatal_mca("Too many bus checks"); 699 700 if (pbci->ib) 701 return fatal_mca("Internal Bus error"); 702 if (pbci->eb && pbci->bsi > 0) 703 return fatal_mca("External bus check fatal status"); 704 705 /* 706 * This is a local MCA and estimated as a recoverable error. 707 */ 708 if (platform) 709 return recover_from_platform_error(slidx, peidx, pbci, sos); 710 711 /* 712 * On account of strange SAL error record, we cannot recover. 713 */ 714 return fatal_mca("Strange SAL record"); 715 } 716 717 /** 718 * mca_try_to_recover - Try to recover from MCA 719 * @rec: pointer to a SAL error record 720 * @sos: pointer to hand off struct between SAL and OS 721 * 722 * Return value: 723 * 1 on Success / 0 on Failure 724 */ 725 726 static int 727 mca_try_to_recover(void *rec, struct ia64_sal_os_state *sos) 728 { 729 int platform_err; 730 int n_proc_err; 731 slidx_table_t slidx; 732 peidx_table_t peidx; 733 pal_bus_check_info_t pbci; 734 735 /* Make index of SAL error record */ 736 platform_err = mca_make_slidx(rec, &slidx); 737 738 /* Count processor error sections */ 739 n_proc_err = slidx_count(&slidx, proc_err); 740 741 /* Now, OS can recover when there is one processor error section */ 742 if (n_proc_err > 1) 743 return fatal_mca("Too Many Errors"); 744 else if (n_proc_err == 0) 745 /* Weird SAL record ... We can't do anything */ 746 return fatal_mca("Weird SAL record"); 747 748 /* Make index of processor error section */ 749 mca_make_peidx((sal_log_processor_info_t*) 750 slidx_first_entry(&slidx.proc_err)->hdr, &peidx); 751 752 /* Extract Processor BUS_CHECK[0] */ 753 *((u64*)&pbci) = peidx_check_info(&peidx, bus_check, 0); 754 755 /* Check whether MCA is global or not */ 756 if (is_mca_global(&peidx, &pbci, sos)) 757 return fatal_mca("global MCA"); 758 759 /* Try to recover a processor error */ 760 return recover_from_processor_error(platform_err, &slidx, &peidx, 761 &pbci, sos); 762 } 763 764 /* 765 * ============================================================================= 766 */ 767 768 int __init mca_external_handler_init(void) 769 { 770 if (init_record_index_pools()) 771 return -ENOMEM; 772 773 /* register external mca handlers */ 774 if (ia64_reg_MCA_extension(mca_try_to_recover)) { 775 printk(KERN_ERR "ia64_reg_MCA_extension failed.\n"); 776 kfree(slidx_pool.buffer); 777 return -EFAULT; 778 } 779 return 0; 780 } 781 782 void __exit mca_external_handler_exit(void) 783 { 784 /* unregister external mca handlers */ 785 ia64_unreg_MCA_extension(); 786 kfree(slidx_pool.buffer); 787 } 788 789 module_init(mca_external_handler_init); 790 module_exit(mca_external_handler_exit); 791 792 module_param(sal_rec_max, int, 0644); 793 MODULE_PARM_DESC(sal_rec_max, "Max size of SAL error record"); 794 795 MODULE_DESCRIPTION("ia64 platform dependent mca handler driver"); 796 MODULE_LICENSE("GPL"); 797