1/* 2 * GHES/EDAC Linux driver 3 * 4 * This file may be distributed under the terms of the GNU General Public 5 * License version 2. 6 * 7 * Copyright (c) 2013 by Mauro Carvalho Chehab 8 * 9 * Red Hat Inc. http://www.redhat.com 10 */ 11 12#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 13 14#include <acpi/ghes.h> 15#include <linux/edac.h> 16#include <linux/dmi.h> 17#include "edac_core.h" 18#include <ras/ras_event.h> 19 20#define GHES_EDAC_REVISION " Ver: 1.0.0" 21 22struct ghes_edac_pvt { 23 struct list_head list; 24 struct ghes *ghes; 25 struct mem_ctl_info *mci; 26 27 /* Buffers for the error handling routine */ 28 char detail_location[240]; 29 char other_detail[160]; 30 char msg[80]; 31}; 32 33static LIST_HEAD(ghes_reglist); 34static DEFINE_MUTEX(ghes_edac_lock); 35static int ghes_edac_mc_num; 36 37 38/* Memory Device - Type 17 of SMBIOS spec */ 39struct memdev_dmi_entry { 40 u8 type; 41 u8 length; 42 u16 handle; 43 u16 phys_mem_array_handle; 44 u16 mem_err_info_handle; 45 u16 total_width; 46 u16 data_width; 47 u16 size; 48 u8 form_factor; 49 u8 device_set; 50 u8 device_locator; 51 u8 bank_locator; 52 u8 memory_type; 53 u16 type_detail; 54 u16 speed; 55 u8 manufacturer; 56 u8 serial_number; 57 u8 asset_tag; 58 u8 part_number; 59 u8 attributes; 60 u32 extended_size; 61 u16 conf_mem_clk_speed; 62} __attribute__((__packed__)); 63 64struct ghes_edac_dimm_fill { 65 struct mem_ctl_info *mci; 66 unsigned count; 67}; 68 69char *memory_type[] = { 70 [MEM_EMPTY] = "EMPTY", 71 [MEM_RESERVED] = "RESERVED", 72 [MEM_UNKNOWN] = "UNKNOWN", 73 [MEM_FPM] = "FPM", 74 [MEM_EDO] = "EDO", 75 [MEM_BEDO] = "BEDO", 76 [MEM_SDR] = "SDR", 77 [MEM_RDR] = "RDR", 78 [MEM_DDR] = "DDR", 79 [MEM_RDDR] = "RDDR", 80 [MEM_RMBS] = "RMBS", 81 [MEM_DDR2] = "DDR2", 82 [MEM_FB_DDR2] = "FB_DDR2", 83 [MEM_RDDR2] = "RDDR2", 84 [MEM_XDR] = "XDR", 85 [MEM_DDR3] = "DDR3", 86 [MEM_RDDR3] = "RDDR3", 87}; 88 89static void ghes_edac_count_dimms(const struct dmi_header *dh, void *arg) 90{ 91 int *num_dimm = arg; 92 93 if (dh->type == DMI_ENTRY_MEM_DEVICE) 94 (*num_dimm)++; 95} 96 97static void ghes_edac_dmidecode(const struct dmi_header *dh, void *arg) 98{ 99 struct ghes_edac_dimm_fill *dimm_fill = arg; 100 struct mem_ctl_info *mci = dimm_fill->mci; 101 102 if (dh->type == DMI_ENTRY_MEM_DEVICE) { 103 struct memdev_dmi_entry *entry = (struct memdev_dmi_entry *)dh; 104 struct dimm_info *dimm = EDAC_DIMM_PTR(mci->layers, mci->dimms, 105 mci->n_layers, 106 dimm_fill->count, 0, 0); 107 108 if (entry->size == 0xffff) { 109 pr_info("Can't get DIMM%i size\n", 110 dimm_fill->count); 111 dimm->nr_pages = MiB_TO_PAGES(32);/* Unknown */ 112 } else if (entry->size == 0x7fff) { 113 dimm->nr_pages = MiB_TO_PAGES(entry->extended_size); 114 } else { 115 if (entry->size & 1 << 15) 116 dimm->nr_pages = MiB_TO_PAGES((entry->size & 117 0x7fff) << 10); 118 else 119 dimm->nr_pages = MiB_TO_PAGES(entry->size); 120 } 121 122 switch (entry->memory_type) { 123 case 0x12: 124 if (entry->type_detail & 1 << 13) 125 dimm->mtype = MEM_RDDR; 126 else 127 dimm->mtype = MEM_DDR; 128 break; 129 case 0x13: 130 if (entry->type_detail & 1 << 13) 131 dimm->mtype = MEM_RDDR2; 132 else 133 dimm->mtype = MEM_DDR2; 134 break; 135 case 0x14: 136 dimm->mtype = MEM_FB_DDR2; 137 break; 138 case 0x18: 139 if (entry->type_detail & 1 << 13) 140 dimm->mtype = MEM_RDDR3; 141 else 142 dimm->mtype = MEM_DDR3; 143 break; 144 default: 145 if (entry->type_detail & 1 << 6) 146 dimm->mtype = MEM_RMBS; 147 else if ((entry->type_detail & ((1 << 7) | (1 << 13))) 148 == ((1 << 7) | (1 << 13))) 149 dimm->mtype = MEM_RDR; 150 else if (entry->type_detail & 1 << 7) 151 dimm->mtype = MEM_SDR; 152 else if (entry->type_detail & 1 << 9) 153 dimm->mtype = MEM_EDO; 154 else 155 dimm->mtype = MEM_UNKNOWN; 156 } 157 158 /* 159 * Actually, we can only detect if the memory has bits for 160 * checksum or not 161 */ 162 if (entry->total_width == entry->data_width) 163 dimm->edac_mode = EDAC_NONE; 164 else 165 dimm->edac_mode = EDAC_SECDED; 166 167 dimm->dtype = DEV_UNKNOWN; 168 dimm->grain = 128; /* Likely, worse case */ 169 170 /* 171 * FIXME: It shouldn't be hard to also fill the DIMM labels 172 */ 173 174 if (dimm->nr_pages) { 175 edac_dbg(1, "DIMM%i: %s size = %d MB%s\n", 176 dimm_fill->count, memory_type[dimm->mtype], 177 PAGES_TO_MiB(dimm->nr_pages), 178 (dimm->edac_mode != EDAC_NONE) ? "(ECC)" : ""); 179 edac_dbg(2, "\ttype %d, detail 0x%02x, width %d(total %d)\n", 180 entry->memory_type, entry->type_detail, 181 entry->total_width, entry->data_width); 182 } 183 184 dimm_fill->count++; 185 } 186} 187 188void ghes_edac_report_mem_error(struct ghes *ghes, int sev, 189 struct cper_sec_mem_err *mem_err) 190{ 191 enum hw_event_mc_err_type type; 192 struct edac_raw_error_desc *e; 193 struct mem_ctl_info *mci; 194 struct ghes_edac_pvt *pvt = NULL; 195 char *p; 196 u8 grain_bits; 197 198 list_for_each_entry(pvt, &ghes_reglist, list) { 199 if (ghes == pvt->ghes) 200 break; 201 } 202 if (!pvt) { 203 pr_err("Internal error: Can't find EDAC structure\n"); 204 return; 205 } 206 mci = pvt->mci; 207 e = &mci->error_desc; 208 209 /* Cleans the error report buffer */ 210 memset(e, 0, sizeof (*e)); 211 e->error_count = 1; 212 strcpy(e->label, "unknown label"); 213 e->msg = pvt->msg; 214 e->other_detail = pvt->other_detail; 215 e->top_layer = -1; 216 e->mid_layer = -1; 217 e->low_layer = -1; 218 *pvt->other_detail = '\0'; 219 *pvt->msg = '\0'; 220 221 switch (sev) { 222 case GHES_SEV_CORRECTED: 223 type = HW_EVENT_ERR_CORRECTED; 224 break; 225 case GHES_SEV_RECOVERABLE: 226 type = HW_EVENT_ERR_UNCORRECTED; 227 break; 228 case GHES_SEV_PANIC: 229 type = HW_EVENT_ERR_FATAL; 230 break; 231 default: 232 case GHES_SEV_NO: 233 type = HW_EVENT_ERR_INFO; 234 } 235 236 edac_dbg(1, "error validation_bits: 0x%08llx\n", 237 (long long)mem_err->validation_bits); 238 239 /* Error type, mapped on e->msg */ 240 if (mem_err->validation_bits & CPER_MEM_VALID_ERROR_TYPE) { 241 p = pvt->msg; 242 switch (mem_err->error_type) { 243 case 0: 244 p += sprintf(p, "Unknown"); 245 break; 246 case 1: 247 p += sprintf(p, "No error"); 248 break; 249 case 2: 250 p += sprintf(p, "Single-bit ECC"); 251 break; 252 case 3: 253 p += sprintf(p, "Multi-bit ECC"); 254 break; 255 case 4: 256 p += sprintf(p, "Single-symbol ChipKill ECC"); 257 break; 258 case 5: 259 p += sprintf(p, "Multi-symbol ChipKill ECC"); 260 break; 261 case 6: 262 p += sprintf(p, "Master abort"); 263 break; 264 case 7: 265 p += sprintf(p, "Target abort"); 266 break; 267 case 8: 268 p += sprintf(p, "Parity Error"); 269 break; 270 case 9: 271 p += sprintf(p, "Watchdog timeout"); 272 break; 273 case 10: 274 p += sprintf(p, "Invalid address"); 275 break; 276 case 11: 277 p += sprintf(p, "Mirror Broken"); 278 break; 279 case 12: 280 p += sprintf(p, "Memory Sparing"); 281 break; 282 case 13: 283 p += sprintf(p, "Scrub corrected error"); 284 break; 285 case 14: 286 p += sprintf(p, "Scrub uncorrected error"); 287 break; 288 case 15: 289 p += sprintf(p, "Physical Memory Map-out event"); 290 break; 291 default: 292 p += sprintf(p, "reserved error (%d)", 293 mem_err->error_type); 294 } 295 } else { 296 strcpy(pvt->msg, "unknown error"); 297 } 298 299 /* Error address */ 300 if (mem_err->validation_bits & CPER_MEM_VALID_PA) { 301 e->page_frame_number = mem_err->physical_addr >> PAGE_SHIFT; 302 e->offset_in_page = mem_err->physical_addr & ~PAGE_MASK; 303 } 304 305 /* Error grain */ 306 if (mem_err->validation_bits & CPER_MEM_VALID_PA_MASK) 307 e->grain = ~(mem_err->physical_addr_mask & ~PAGE_MASK); 308 309 /* Memory error location, mapped on e->location */ 310 p = e->location; 311 if (mem_err->validation_bits & CPER_MEM_VALID_NODE) 312 p += sprintf(p, "node:%d ", mem_err->node); 313 if (mem_err->validation_bits & CPER_MEM_VALID_CARD) 314 p += sprintf(p, "card:%d ", mem_err->card); 315 if (mem_err->validation_bits & CPER_MEM_VALID_MODULE) 316 p += sprintf(p, "module:%d ", mem_err->module); 317 if (mem_err->validation_bits & CPER_MEM_VALID_RANK_NUMBER) 318 p += sprintf(p, "rank:%d ", mem_err->rank); 319 if (mem_err->validation_bits & CPER_MEM_VALID_BANK) 320 p += sprintf(p, "bank:%d ", mem_err->bank); 321 if (mem_err->validation_bits & CPER_MEM_VALID_ROW) 322 p += sprintf(p, "row:%d ", mem_err->row); 323 if (mem_err->validation_bits & CPER_MEM_VALID_COLUMN) 324 p += sprintf(p, "col:%d ", mem_err->column); 325 if (mem_err->validation_bits & CPER_MEM_VALID_BIT_POSITION) 326 p += sprintf(p, "bit_pos:%d ", mem_err->bit_pos); 327 if (mem_err->validation_bits & CPER_MEM_VALID_MODULE_HANDLE) { 328 const char *bank = NULL, *device = NULL; 329 dmi_memdev_name(mem_err->mem_dev_handle, &bank, &device); 330 if (bank != NULL && device != NULL) 331 p += sprintf(p, "DIMM location:%s %s ", bank, device); 332 else 333 p += sprintf(p, "DIMM DMI handle: 0x%.4x ", 334 mem_err->mem_dev_handle); 335 } 336 if (p > e->location) 337 *(p - 1) = '\0'; 338 339 /* All other fields are mapped on e->other_detail */ 340 p = pvt->other_detail; 341 if (mem_err->validation_bits & CPER_MEM_VALID_ERROR_STATUS) { 342 u64 status = mem_err->error_status; 343 344 p += sprintf(p, "status(0x%016llx): ", (long long)status); 345 switch ((status >> 8) & 0xff) { 346 case 1: 347 p += sprintf(p, "Error detected internal to the component "); 348 break; 349 case 16: 350 p += sprintf(p, "Error detected in the bus "); 351 break; 352 case 4: 353 p += sprintf(p, "Storage error in DRAM memory "); 354 break; 355 case 5: 356 p += sprintf(p, "Storage error in TLB "); 357 break; 358 case 6: 359 p += sprintf(p, "Storage error in cache "); 360 break; 361 case 7: 362 p += sprintf(p, "Error in one or more functional units "); 363 break; 364 case 8: 365 p += sprintf(p, "component failed self test "); 366 break; 367 case 9: 368 p += sprintf(p, "Overflow or undervalue of internal queue "); 369 break; 370 case 17: 371 p += sprintf(p, "Virtual address not found on IO-TLB or IO-PDIR "); 372 break; 373 case 18: 374 p += sprintf(p, "Improper access error "); 375 break; 376 case 19: 377 p += sprintf(p, "Access to a memory address which is not mapped to any component "); 378 break; 379 case 20: 380 p += sprintf(p, "Loss of Lockstep "); 381 break; 382 case 21: 383 p += sprintf(p, "Response not associated with a request "); 384 break; 385 case 22: 386 p += sprintf(p, "Bus parity error - must also set the A, C, or D Bits "); 387 break; 388 case 23: 389 p += sprintf(p, "Detection of a PATH_ERROR "); 390 break; 391 case 25: 392 p += sprintf(p, "Bus operation timeout "); 393 break; 394 case 26: 395 p += sprintf(p, "A read was issued to data that has been poisoned "); 396 break; 397 default: 398 p += sprintf(p, "reserved "); 399 break; 400 } 401 } 402 if (mem_err->validation_bits & CPER_MEM_VALID_REQUESTOR_ID) 403 p += sprintf(p, "requestorID: 0x%016llx ", 404 (long long)mem_err->requestor_id); 405 if (mem_err->validation_bits & CPER_MEM_VALID_RESPONDER_ID) 406 p += sprintf(p, "responderID: 0x%016llx ", 407 (long long)mem_err->responder_id); 408 if (mem_err->validation_bits & CPER_MEM_VALID_TARGET_ID) 409 p += sprintf(p, "targetID: 0x%016llx ", 410 (long long)mem_err->responder_id); 411 if (p > pvt->other_detail) 412 *(p - 1) = '\0'; 413 414 /* Generate the trace event */ 415 grain_bits = fls_long(e->grain); 416 snprintf(pvt->detail_location, sizeof(pvt->detail_location), 417 "APEI location: %s %s", e->location, e->other_detail); 418 trace_mc_event(type, e->msg, e->label, e->error_count, 419 mci->mc_idx, e->top_layer, e->mid_layer, e->low_layer, 420 PAGES_TO_MiB(e->page_frame_number) | e->offset_in_page, 421 grain_bits, e->syndrome, pvt->detail_location); 422 423 /* Report the error via EDAC API */ 424 edac_raw_mc_handle_error(type, mci, e); 425} 426EXPORT_SYMBOL_GPL(ghes_edac_report_mem_error); 427 428int ghes_edac_register(struct ghes *ghes, struct device *dev) 429{ 430 bool fake = false; 431 int rc, num_dimm = 0; 432 struct mem_ctl_info *mci; 433 struct edac_mc_layer layers[1]; 434 struct ghes_edac_pvt *pvt; 435 struct ghes_edac_dimm_fill dimm_fill; 436 437 /* Get the number of DIMMs */ 438 dmi_walk(ghes_edac_count_dimms, &num_dimm); 439 440 /* Check if we've got a bogus BIOS */ 441 if (num_dimm == 0) { 442 fake = true; 443 num_dimm = 1; 444 } 445 446 layers[0].type = EDAC_MC_LAYER_ALL_MEM; 447 layers[0].size = num_dimm; 448 layers[0].is_virt_csrow = true; 449 450 /* 451 * We need to serialize edac_mc_alloc() and edac_mc_add_mc(), 452 * to avoid duplicated memory controller numbers 453 */ 454 mutex_lock(&ghes_edac_lock); 455 mci = edac_mc_alloc(ghes_edac_mc_num, ARRAY_SIZE(layers), layers, 456 sizeof(*pvt)); 457 if (!mci) { 458 pr_info("Can't allocate memory for EDAC data\n"); 459 mutex_unlock(&ghes_edac_lock); 460 return -ENOMEM; 461 } 462 463 pvt = mci->pvt_info; 464 memset(pvt, 0, sizeof(*pvt)); 465 list_add_tail(&pvt->list, &ghes_reglist); 466 pvt->ghes = ghes; 467 pvt->mci = mci; 468 mci->pdev = dev; 469 470 mci->mtype_cap = MEM_FLAG_EMPTY; 471 mci->edac_ctl_cap = EDAC_FLAG_NONE; 472 mci->edac_cap = EDAC_FLAG_NONE; 473 mci->mod_name = "ghes_edac.c"; 474 mci->mod_ver = GHES_EDAC_REVISION; 475 mci->ctl_name = "ghes_edac"; 476 mci->dev_name = "ghes"; 477 478 if (!ghes_edac_mc_num) { 479 if (!fake) { 480 pr_info("This EDAC driver relies on BIOS to enumerate memory and get error reports.\n"); 481 pr_info("Unfortunately, not all BIOSes reflect the memory layout correctly.\n"); 482 pr_info("So, the end result of using this driver varies from vendor to vendor.\n"); 483 pr_info("If you find incorrect reports, please contact your hardware vendor\n"); 484 pr_info("to correct its BIOS.\n"); 485 pr_info("This system has %d DIMM sockets.\n", 486 num_dimm); 487 } else { 488 pr_info("This system has a very crappy BIOS: It doesn't even list the DIMMS.\n"); 489 pr_info("Its SMBIOS info is wrong. It is doubtful that the error report would\n"); 490 pr_info("work on such system. Use this driver with caution\n"); 491 } 492 } 493 494 if (!fake) { 495 /* 496 * Fill DIMM info from DMI for the memory controller #0 497 * 498 * Keep it in blank for the other memory controllers, as 499 * there's no reliable way to properly credit each DIMM to 500 * the memory controller, as different BIOSes fill the 501 * DMI bank location fields on different ways 502 */ 503 if (!ghes_edac_mc_num) { 504 dimm_fill.count = 0; 505 dimm_fill.mci = mci; 506 dmi_walk(ghes_edac_dmidecode, &dimm_fill); 507 } 508 } else { 509 struct dimm_info *dimm = EDAC_DIMM_PTR(mci->layers, mci->dimms, 510 mci->n_layers, 0, 0, 0); 511 512 dimm->nr_pages = 1; 513 dimm->grain = 128; 514 dimm->mtype = MEM_UNKNOWN; 515 dimm->dtype = DEV_UNKNOWN; 516 dimm->edac_mode = EDAC_SECDED; 517 } 518 519 rc = edac_mc_add_mc(mci); 520 if (rc < 0) { 521 pr_info("Can't register at EDAC core\n"); 522 edac_mc_free(mci); 523 mutex_unlock(&ghes_edac_lock); 524 return -ENODEV; 525 } 526 527 ghes_edac_mc_num++; 528 mutex_unlock(&ghes_edac_lock); 529 return 0; 530} 531EXPORT_SYMBOL_GPL(ghes_edac_register); 532 533void ghes_edac_unregister(struct ghes *ghes) 534{ 535 struct mem_ctl_info *mci; 536 struct ghes_edac_pvt *pvt, *tmp; 537 538 list_for_each_entry_safe(pvt, tmp, &ghes_reglist, list) { 539 if (ghes == pvt->ghes) { 540 mci = pvt->mci; 541 edac_mc_del_mc(mci->pdev); 542 edac_mc_free(mci); 543 list_del(&pvt->list); 544 } 545 } 546} 547EXPORT_SYMBOL_GPL(ghes_edac_unregister); 548