1 /* 2 * Copyright 2019 Advanced Micro Devices, Inc. 3 * 4 * Permission is hereby granted, free of charge, to any person obtaining a 5 * copy of this software and associated documentation files (the "Software"), 6 * to deal in the Software without restriction, including without limitation 7 * the rights to use, copy, modify, merge, publish, distribute, sublicense, 8 * and/or sell copies of the Software, and to permit persons to whom the 9 * Software is furnished to do so, subject to the following conditions: 10 * 11 * The above copyright notice and this permission notice shall be included in 12 * all copies or substantial portions of the Software. 13 * 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 17 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR 18 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR 20 * OTHER DEALINGS IN THE SOFTWARE. 21 * 22 */ 23 24 #include "amdgpu_ras_eeprom.h" 25 #include "amdgpu.h" 26 #include "amdgpu_ras.h" 27 #include <linux/bits.h> 28 #include "smu_v11_0_i2c.h" 29 30 #define EEPROM_I2C_TARGET_ADDR 0xA0 31 32 /* 33 * The 2 macros bellow represent the actual size in bytes that 34 * those entities occupy in the EEPROM memory. 35 * EEPROM_TABLE_RECORD_SIZE is different than sizeof(eeprom_table_record) which 36 * uses uint64 to store 6b fields such as retired_page. 37 */ 38 #define EEPROM_TABLE_HEADER_SIZE 20 39 #define EEPROM_TABLE_RECORD_SIZE 24 40 41 #define EEPROM_ADDRESS_SIZE 0x2 42 43 /* Table hdr is 'AMDR' */ 44 #define EEPROM_TABLE_HDR_VAL 0x414d4452 45 #define EEPROM_TABLE_VER 0x00010000 46 47 /* Assume 2 Mbit size */ 48 #define EEPROM_SIZE_BYTES 256000 49 #define EEPROM_PAGE__SIZE_BYTES 256 50 #define EEPROM_HDR_START 0 51 #define EEPROM_RECORD_START (EEPROM_HDR_START + EEPROM_TABLE_HEADER_SIZE) 52 #define EEPROM_MAX_RECORD_NUM ((EEPROM_SIZE_BYTES - EEPROM_TABLE_HEADER_SIZE) / EEPROM_TABLE_RECORD_SIZE) 53 #define EEPROM_ADDR_MSB_MASK GENMASK(17, 8) 54 55 #define to_amdgpu_device(x) (container_of(x, struct amdgpu_ras, eeprom_control))->adev 56 57 static void __encode_table_header_to_buff(struct amdgpu_ras_eeprom_table_header *hdr, 58 unsigned char *buff) 59 { 60 uint32_t *pp = (uint32_t *) buff; 61 62 pp[0] = cpu_to_le32(hdr->header); 63 pp[1] = cpu_to_le32(hdr->version); 64 pp[2] = cpu_to_le32(hdr->first_rec_offset); 65 pp[3] = cpu_to_le32(hdr->tbl_size); 66 pp[4] = cpu_to_le32(hdr->checksum); 67 } 68 69 static void __decode_table_header_from_buff(struct amdgpu_ras_eeprom_table_header *hdr, 70 unsigned char *buff) 71 { 72 uint32_t *pp = (uint32_t *)buff; 73 74 hdr->header = le32_to_cpu(pp[0]); 75 hdr->version = le32_to_cpu(pp[1]); 76 hdr->first_rec_offset = le32_to_cpu(pp[2]); 77 hdr->tbl_size = le32_to_cpu(pp[3]); 78 hdr->checksum = le32_to_cpu(pp[4]); 79 } 80 81 static int __update_table_header(struct amdgpu_ras_eeprom_control *control, 82 unsigned char *buff) 83 { 84 int ret = 0; 85 struct i2c_msg msg = { 86 .addr = EEPROM_I2C_TARGET_ADDR, 87 .flags = 0, 88 .len = EEPROM_ADDRESS_SIZE + EEPROM_TABLE_HEADER_SIZE, 89 .buf = buff, 90 }; 91 92 93 *(uint16_t *)buff = EEPROM_HDR_START; 94 __encode_table_header_to_buff(&control->tbl_hdr, buff + EEPROM_ADDRESS_SIZE); 95 96 ret = i2c_transfer(&control->eeprom_accessor, &msg, 1); 97 if (ret < 1) 98 DRM_ERROR("Failed to write EEPROM table header, ret:%d", ret); 99 100 return ret; 101 } 102 103 104 105 static uint32_t __calc_hdr_byte_sum(struct amdgpu_ras_eeprom_control *control) 106 { 107 int i; 108 uint32_t tbl_sum = 0; 109 110 /* Header checksum, skip checksum field in the calculation */ 111 for (i = 0; i < sizeof(control->tbl_hdr) - sizeof(control->tbl_hdr.checksum); i++) 112 tbl_sum += *(((unsigned char *)&control->tbl_hdr) + i); 113 114 return tbl_sum; 115 } 116 117 static uint32_t __calc_recs_byte_sum(struct eeprom_table_record *records, 118 int num) 119 { 120 int i, j; 121 uint32_t tbl_sum = 0; 122 123 /* Records checksum */ 124 for (i = 0; i < num; i++) { 125 struct eeprom_table_record *record = &records[i]; 126 127 for (j = 0; j < sizeof(*record); j++) { 128 tbl_sum += *(((unsigned char *)record) + j); 129 } 130 } 131 132 return tbl_sum; 133 } 134 135 static inline uint32_t __calc_tbl_byte_sum(struct amdgpu_ras_eeprom_control *control, 136 struct eeprom_table_record *records, int num) 137 { 138 return __calc_hdr_byte_sum(control) + __calc_recs_byte_sum(records, num); 139 } 140 141 /* Checksum = 256 -((sum of all table entries) mod 256) */ 142 static void __update_tbl_checksum(struct amdgpu_ras_eeprom_control *control, 143 struct eeprom_table_record *records, int num, 144 uint32_t old_hdr_byte_sum) 145 { 146 /* 147 * This will update the table sum with new records. 148 * 149 * TODO: What happens when the EEPROM table is to be wrapped around 150 * and old records from start will get overridden. 151 */ 152 153 /* need to recalculate updated header byte sum */ 154 control->tbl_byte_sum -= old_hdr_byte_sum; 155 control->tbl_byte_sum += __calc_tbl_byte_sum(control, records, num); 156 157 control->tbl_hdr.checksum = 256 - (control->tbl_byte_sum % 256); 158 } 159 160 /* table sum mod 256 + checksum must equals 256 */ 161 static bool __validate_tbl_checksum(struct amdgpu_ras_eeprom_control *control, 162 struct eeprom_table_record *records, int num) 163 { 164 control->tbl_byte_sum = __calc_tbl_byte_sum(control, records, num); 165 166 if (control->tbl_hdr.checksum + (control->tbl_byte_sum % 256) != 256) { 167 DRM_WARN("Checksum mismatch, checksum: %u ", control->tbl_hdr.checksum); 168 return false; 169 } 170 171 return true; 172 } 173 174 int amdgpu_ras_eeprom_reset_table(struct amdgpu_ras_eeprom_control *control) 175 { 176 unsigned char buff[EEPROM_ADDRESS_SIZE + EEPROM_TABLE_HEADER_SIZE] = { 0 }; 177 struct amdgpu_ras_eeprom_table_header *hdr = &control->tbl_hdr; 178 int ret = 0; 179 180 mutex_lock(&control->tbl_mutex); 181 182 hdr->header = EEPROM_TABLE_HDR_VAL; 183 hdr->version = EEPROM_TABLE_VER; 184 hdr->first_rec_offset = EEPROM_RECORD_START; 185 hdr->tbl_size = EEPROM_TABLE_HEADER_SIZE; 186 187 control->tbl_byte_sum = 0; 188 __update_tbl_checksum(control, NULL, 0, 0); 189 control->next_addr = EEPROM_RECORD_START; 190 191 ret = __update_table_header(control, buff); 192 193 mutex_unlock(&control->tbl_mutex); 194 195 return ret; 196 197 } 198 199 int amdgpu_ras_eeprom_init(struct amdgpu_ras_eeprom_control *control) 200 { 201 int ret = 0; 202 struct amdgpu_device *adev = to_amdgpu_device(control); 203 unsigned char buff[EEPROM_ADDRESS_SIZE + EEPROM_TABLE_HEADER_SIZE] = { 0 }; 204 struct amdgpu_ras_eeprom_table_header *hdr = &control->tbl_hdr; 205 struct i2c_msg msg = { 206 .addr = EEPROM_I2C_TARGET_ADDR, 207 .flags = I2C_M_RD, 208 .len = EEPROM_ADDRESS_SIZE + EEPROM_TABLE_HEADER_SIZE, 209 .buf = buff, 210 }; 211 212 mutex_init(&control->tbl_mutex); 213 214 switch (adev->asic_type) { 215 case CHIP_VEGA20: 216 ret = smu_v11_0_i2c_eeprom_control_init(&control->eeprom_accessor); 217 break; 218 219 default: 220 return 0; 221 } 222 223 if (ret) { 224 DRM_ERROR("Failed to init I2C controller, ret:%d", ret); 225 return ret; 226 } 227 228 /* Read/Create table header from EEPROM address 0 */ 229 ret = i2c_transfer(&control->eeprom_accessor, &msg, 1); 230 if (ret < 1) { 231 DRM_ERROR("Failed to read EEPROM table header, ret:%d", ret); 232 return ret; 233 } 234 235 __decode_table_header_from_buff(hdr, &buff[2]); 236 237 if (hdr->header == EEPROM_TABLE_HDR_VAL) { 238 control->num_recs = (hdr->tbl_size - EEPROM_TABLE_HEADER_SIZE) / 239 EEPROM_TABLE_RECORD_SIZE; 240 control->tbl_byte_sum = __calc_hdr_byte_sum(control); 241 control->next_addr = EEPROM_RECORD_START; 242 243 DRM_DEBUG_DRIVER("Found existing EEPROM table with %d records", 244 control->num_recs); 245 246 } else { 247 DRM_INFO("Creating new EEPROM table"); 248 249 ret = amdgpu_ras_eeprom_reset_table(control); 250 } 251 252 return ret == 1 ? 0 : -EIO; 253 } 254 255 void amdgpu_ras_eeprom_fini(struct amdgpu_ras_eeprom_control *control) 256 { 257 struct amdgpu_device *adev = to_amdgpu_device(control); 258 259 switch (adev->asic_type) { 260 case CHIP_VEGA20: 261 smu_v11_0_i2c_eeprom_control_fini(&control->eeprom_accessor); 262 break; 263 264 default: 265 return; 266 } 267 } 268 269 static void __encode_table_record_to_buff(struct amdgpu_ras_eeprom_control *control, 270 struct eeprom_table_record *record, 271 unsigned char *buff) 272 { 273 __le64 tmp = 0; 274 int i = 0; 275 276 /* Next are all record fields according to EEPROM page spec in LE foramt */ 277 buff[i++] = record->err_type; 278 279 buff[i++] = record->bank; 280 281 tmp = cpu_to_le64(record->ts); 282 memcpy(buff + i, &tmp, 8); 283 i += 8; 284 285 tmp = cpu_to_le64((record->offset & 0xffffffffffff)); 286 memcpy(buff + i, &tmp, 6); 287 i += 6; 288 289 buff[i++] = record->mem_channel; 290 buff[i++] = record->mcumc_id; 291 292 tmp = cpu_to_le64((record->retired_page & 0xffffffffffff)); 293 memcpy(buff + i, &tmp, 6); 294 } 295 296 static void __decode_table_record_from_buff(struct amdgpu_ras_eeprom_control *control, 297 struct eeprom_table_record *record, 298 unsigned char *buff) 299 { 300 __le64 tmp = 0; 301 int i = 0; 302 303 /* Next are all record fields according to EEPROM page spec in LE foramt */ 304 record->err_type = buff[i++]; 305 306 record->bank = buff[i++]; 307 308 memcpy(&tmp, buff + i, 8); 309 record->ts = le64_to_cpu(tmp); 310 i += 8; 311 312 memcpy(&tmp, buff + i, 6); 313 record->offset = (le64_to_cpu(tmp) & 0xffffffffffff); 314 i += 6; 315 316 record->mem_channel = buff[i++]; 317 record->mcumc_id = buff[i++]; 318 319 memcpy(&tmp, buff + i, 6); 320 record->retired_page = (le64_to_cpu(tmp) & 0xffffffffffff); 321 } 322 323 /* 324 * When reaching end of EEPROM memory jump back to 0 record address 325 * When next record access will go beyond EEPROM page boundary modify bits A17/A8 326 * in I2C selector to go to next page 327 */ 328 static uint32_t __correct_eeprom_dest_address(uint32_t curr_address) 329 { 330 uint32_t next_address = curr_address + EEPROM_TABLE_RECORD_SIZE; 331 332 /* When all EEPROM memory used jump back to 0 address */ 333 if (next_address > EEPROM_SIZE_BYTES) { 334 DRM_INFO("Reached end of EEPROM memory, jumping to 0 " 335 "and overriding old record"); 336 return EEPROM_RECORD_START; 337 } 338 339 /* 340 * To check if we overflow page boundary compare next address with 341 * current and see if bits 17/8 of the EEPROM address will change 342 * If they do start from the next 256b page 343 * 344 * https://www.st.com/resource/en/datasheet/m24m02-dr.pdf sec. 5.1.2 345 */ 346 if ((curr_address & EEPROM_ADDR_MSB_MASK) != (next_address & EEPROM_ADDR_MSB_MASK)) { 347 DRM_DEBUG_DRIVER("Reached end of EEPROM memory page, jumping to next: %lx", 348 (next_address & EEPROM_ADDR_MSB_MASK)); 349 350 return (next_address & EEPROM_ADDR_MSB_MASK); 351 } 352 353 return curr_address; 354 } 355 356 int amdgpu_ras_eeprom_process_recods(struct amdgpu_ras_eeprom_control *control, 357 struct eeprom_table_record *records, 358 bool write, 359 int num) 360 { 361 int i, ret = 0; 362 struct i2c_msg *msgs; 363 unsigned char *buffs; 364 struct amdgpu_device *adev = to_amdgpu_device(control); 365 366 if (adev->asic_type != CHIP_VEGA20) 367 return 0; 368 369 buffs = kcalloc(num, EEPROM_ADDRESS_SIZE + EEPROM_TABLE_RECORD_SIZE, 370 GFP_KERNEL); 371 if (!buffs) 372 return -ENOMEM; 373 374 mutex_lock(&control->tbl_mutex); 375 376 msgs = kcalloc(num, sizeof(*msgs), GFP_KERNEL); 377 if (!msgs) { 378 ret = -ENOMEM; 379 goto free_buff; 380 } 381 382 /* In case of overflow just start from beginning to not lose newest records */ 383 if (write && (control->next_addr + EEPROM_TABLE_RECORD_SIZE * num > EEPROM_SIZE_BYTES)) 384 control->next_addr = EEPROM_RECORD_START; 385 386 387 /* 388 * TODO Currently makes EEPROM writes for each record, this creates 389 * internal fragmentation. Optimized the code to do full page write of 390 * 256b 391 */ 392 for (i = 0; i < num; i++) { 393 unsigned char *buff = &buffs[i * (EEPROM_ADDRESS_SIZE + EEPROM_TABLE_RECORD_SIZE)]; 394 struct eeprom_table_record *record = &records[i]; 395 struct i2c_msg *msg = &msgs[i]; 396 397 control->next_addr = __correct_eeprom_dest_address(control->next_addr); 398 399 /* 400 * Update bits 16,17 of EEPROM address in I2C address by setting them 401 * to bits 1,2 of Device address byte 402 */ 403 msg->addr = EEPROM_I2C_TARGET_ADDR | 404 ((control->next_addr & EEPROM_ADDR_MSB_MASK) >> 15); 405 msg->flags = write ? 0 : I2C_M_RD; 406 msg->len = EEPROM_ADDRESS_SIZE + EEPROM_TABLE_RECORD_SIZE; 407 msg->buf = buff; 408 409 /* Insert the EEPROM dest addess, bits 0-15 */ 410 buff[0] = ((control->next_addr >> 8) & 0xff); 411 buff[1] = (control->next_addr & 0xff); 412 413 /* EEPROM table content is stored in LE format */ 414 if (write) 415 __encode_table_record_to_buff(control, record, buff + EEPROM_ADDRESS_SIZE); 416 417 /* 418 * The destination EEPROM address might need to be corrected to account 419 * for page or entire memory wrapping 420 */ 421 control->next_addr += EEPROM_TABLE_RECORD_SIZE; 422 } 423 424 ret = i2c_transfer(&control->eeprom_accessor, msgs, num); 425 if (ret < 1) { 426 DRM_ERROR("Failed to process EEPROM table records, ret:%d", ret); 427 428 /* TODO Restore prev next EEPROM address ? */ 429 goto free_msgs; 430 } 431 432 433 if (!write) { 434 for (i = 0; i < num; i++) { 435 unsigned char *buff = &buffs[i*(EEPROM_ADDRESS_SIZE + EEPROM_TABLE_RECORD_SIZE)]; 436 struct eeprom_table_record *record = &records[i]; 437 438 __decode_table_record_from_buff(control, record, buff + EEPROM_ADDRESS_SIZE); 439 } 440 } 441 442 if (write) { 443 uint32_t old_hdr_byte_sum = __calc_hdr_byte_sum(control); 444 445 /* 446 * Update table header with size and CRC and account for table 447 * wrap around where the assumption is that we treat it as empty 448 * table 449 * 450 * TODO - Check the assumption is correct 451 */ 452 control->num_recs += num; 453 control->num_recs %= EEPROM_MAX_RECORD_NUM; 454 control->tbl_hdr.tbl_size += EEPROM_TABLE_RECORD_SIZE * num; 455 if (control->tbl_hdr.tbl_size > EEPROM_SIZE_BYTES) 456 control->tbl_hdr.tbl_size = EEPROM_TABLE_HEADER_SIZE + 457 control->num_recs * EEPROM_TABLE_RECORD_SIZE; 458 459 __update_tbl_checksum(control, records, num, old_hdr_byte_sum); 460 461 __update_table_header(control, buffs); 462 } else if (!__validate_tbl_checksum(control, records, num)) { 463 DRM_WARN("EEPROM Table checksum mismatch!"); 464 /* TODO Uncomment when EEPROM read/write is relliable */ 465 /* ret = -EIO; */ 466 } 467 468 free_msgs: 469 kfree(msgs); 470 471 free_buff: 472 kfree(buffs); 473 474 mutex_unlock(&control->tbl_mutex); 475 476 return ret == num ? 0 : -EIO; 477 } 478 479 /* Used for testing if bugs encountered */ 480 #if 0 481 void amdgpu_ras_eeprom_test(struct amdgpu_ras_eeprom_control *control) 482 { 483 int i; 484 struct eeprom_table_record *recs = kcalloc(1, sizeof(*recs), GFP_KERNEL); 485 486 if (!recs) 487 return; 488 489 for (i = 0; i < 1 ; i++) { 490 recs[i].address = 0xdeadbeef; 491 recs[i].retired_page = i; 492 } 493 494 if (!amdgpu_ras_eeprom_process_recods(control, recs, true, 1)) { 495 496 memset(recs, 0, sizeof(*recs) * 1); 497 498 control->next_addr = EEPROM_RECORD_START; 499 500 if (!amdgpu_ras_eeprom_process_recods(control, recs, false, 1)) { 501 for (i = 0; i < 1; i++) 502 DRM_INFO("rec.address :0x%llx, rec.retired_page :%llu", 503 recs[i].address, recs[i].retired_page); 504 } else 505 DRM_ERROR("Failed in reading from table"); 506 507 } else 508 DRM_ERROR("Failed in writing to table"); 509 } 510 #endif 511