drivers/gpu/drm/amd/amdgpu/amdgpu_ras.c

   1 /*
   2  * Copyright 2018 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 <linux/debugfs.h>
  25 #include <linux/list.h>
  26 #include <linux/module.h>
  27 #include <linux/uaccess.h>
  28 #include <linux/reboot.h>
  29 #include <linux/syscalls.h>
  30 #include <linux/pm_runtime.h>
  31
  32 #include "amdgpu.h"
  33 #include "amdgpu_ras.h"
  34 #include "amdgpu_atomfirmware.h"
  35 #include "amdgpu_xgmi.h"
  36 #include "ivsrcid/nbio/irqsrcs_nbif_7_4.h"
  37 #include "atom.h"
  38
  39 static const char *RAS_FS_NAME = "ras";
  40
  41 const char *ras_error_string[] = {
  42         "none",
  43         "parity",
  44         "single_correctable",
  45         "multi_uncorrectable",
  46         "poison",
  47 };
  48
  49 const char *ras_block_string[] = {
  50         "umc",
  51         "sdma",
  52         "gfx",
  53         "mmhub",
  54         "athub",
  55         "pcie_bif",
  56         "hdp",
  57         "xgmi_wafl",
  58         "df",
  59         "smn",
  60         "sem",
  61         "mp0",
  62         "mp1",
  63         "fuse",
  64 };
  65
  66 #define ras_err_str(i) (ras_error_string[ffs(i)])
  67 #define ras_block_str(i) (ras_block_string[i])
  68
  69 #define RAS_DEFAULT_FLAGS (AMDGPU_RAS_FLAG_INIT_BY_VBIOS)
  70
  71 /* inject address is 52 bits */
  72 #define RAS_UMC_INJECT_ADDR_LIMIT       (0x1ULL << 52)
  73
  74 /* typical ECC bad page rate(1 bad page per 100MB VRAM) */
  75 #define RAS_BAD_PAGE_RATE               (100 * 1024 * 1024ULL)
  76
  77 enum amdgpu_ras_retire_page_reservation {
  78         AMDGPU_RAS_RETIRE_PAGE_RESERVED,
  79         AMDGPU_RAS_RETIRE_PAGE_PENDING,
  80         AMDGPU_RAS_RETIRE_PAGE_FAULT,
  81 };
  82
  83 atomic_t amdgpu_ras_in_intr = ATOMIC_INIT(0);
  84
  85 static bool amdgpu_ras_check_bad_page_unlock(struct amdgpu_ras *con,
  86                                 uint64_t addr);
  87 static bool amdgpu_ras_check_bad_page(struct amdgpu_device *adev,
  88                                 uint64_t addr);
  89
  90 void amdgpu_ras_set_error_query_ready(struct amdgpu_device *adev, bool ready)
  91 {
  92         if (adev && amdgpu_ras_get_context(adev))
  93                 amdgpu_ras_get_context(adev)->error_query_ready = ready;
  94 }
  95
  96 static bool amdgpu_ras_get_error_query_ready(struct amdgpu_device *adev)
  97 {
  98         if (adev && amdgpu_ras_get_context(adev))
  99                 return amdgpu_ras_get_context(adev)->error_query_ready;
 100
 101         return false;
 102 }
 103
 104 static int amdgpu_reserve_page_direct(struct amdgpu_device *adev, uint64_t address)
 105 {
 106         struct ras_err_data err_data = {0, 0, 0, NULL};
 107         struct eeprom_table_record err_rec;
 108
 109         if ((address >= adev->gmc.mc_vram_size) ||
 110             (address >= RAS_UMC_INJECT_ADDR_LIMIT)) {
 111                 dev_warn(adev->dev,
 112                          "RAS WARN: input address 0x%llx is invalid.\n",
 113                          address);
 114                 return -EINVAL;
 115         }
 116
 117         if (amdgpu_ras_check_bad_page(adev, address)) {
 118                 dev_warn(adev->dev,
 119                          "RAS WARN: 0x%llx has already been marked as bad page!\n",
 120                          address);
 121                 return 0;
 122         }
 123
 124         memset(&err_rec, 0x0, sizeof(struct eeprom_table_record));
 125
 126         err_rec.address = address;
 127         err_rec.retired_page = address >> AMDGPU_GPU_PAGE_SHIFT;
 128         err_rec.ts = (uint64_t)ktime_get_real_seconds();
 129         err_rec.err_type = AMDGPU_RAS_EEPROM_ERR_NON_RECOVERABLE;
 130
 131         err_data.err_addr = &err_rec;
 132         err_data.err_addr_cnt = 1;
 133
 134         if (amdgpu_bad_page_threshold != 0) {
 135                 amdgpu_ras_add_bad_pages(adev, err_data.err_addr,
 136                                          err_data.err_addr_cnt);
 137                 amdgpu_ras_save_bad_pages(adev);
 138         }
 139
 140         dev_warn(adev->dev, "WARNING: THIS IS ONLY FOR TEST PURPOSES AND WILL CORRUPT RAS EEPROM\n");
 141         dev_warn(adev->dev, "Clear EEPROM:\n");
 142         dev_warn(adev->dev, "    echo 1 > /sys/kernel/debug/dri/0/ras/ras_eeprom_reset\n");
 143
 144         return 0;
 145 }
 146
 147 static ssize_t amdgpu_ras_debugfs_read(struct file *f, char __user *buf,
 148                                         size_t size, loff_t *pos)
 149 {
 150         struct ras_manager *obj = (struct ras_manager *)file_inode(f)->i_private;
 151         struct ras_query_if info = {
 152                 .head = obj->head,
 153         };
 154         ssize_t s;
 155         char val[128];
 156
 157         if (amdgpu_ras_query_error_status(obj->adev, &info))
 158                 return -EINVAL;
 159
 160         s = snprintf(val, sizeof(val), "%s: %lu\n%s: %lu\n",
 161                         "ue", info.ue_count,
 162                         "ce", info.ce_count);
 163         if (*pos >= s)
 164                 return 0;
 165
 166         s -= *pos;
 167         s = min_t(u64, s, size);
 168
 169
 170         if (copy_to_user(buf, &val[*pos], s))
 171                 return -EINVAL;
 172
 173         *pos += s;
 174
 175         return s;
 176 }
 177
 178 static const struct file_operations amdgpu_ras_debugfs_ops = {
 179         .owner = THIS_MODULE,
 180         .read = amdgpu_ras_debugfs_read,
 181         .write = NULL,
 182         .llseek = default_llseek
 183 };
 184
 185 static int amdgpu_ras_find_block_id_by_name(const char *name, int *block_id)
 186 {
 187         int i;
 188
 189         for (i = 0; i < ARRAY_SIZE(ras_block_string); i++) {
 190                 *block_id = i;
 191                 if (strcmp(name, ras_block_str(i)) == 0)
 192                         return 0;
 193         }
 194         return -EINVAL;
 195 }
 196
 197 static int amdgpu_ras_debugfs_ctrl_parse_data(struct file *f,
 198                 const char __user *buf, size_t size,
 199                 loff_t *pos, struct ras_debug_if *data)
 200 {
 201         ssize_t s = min_t(u64, 64, size);
 202         char str[65];
 203         char block_name[33];
 204         char err[9] = "ue";
 205         int op = -1;
 206         int block_id;
 207         uint32_t sub_block;
 208         u64 address, value;
 209
 210         if (*pos)
 211                 return -EINVAL;
 212         *pos = size;
 213
 214         memset(str, 0, sizeof(str));
 215         memset(data, 0, sizeof(*data));
 216
 217         if (copy_from_user(str, buf, s))
 218                 return -EINVAL;
 219
 220         if (sscanf(str, "disable %32s", block_name) == 1)
 221                 op = 0;
 222         else if (sscanf(str, "enable %32s %8s", block_name, err) == 2)
 223                 op = 1;
 224         else if (sscanf(str, "inject %32s %8s", block_name, err) == 2)
 225                 op = 2;
 226         else if (strstr(str, "retire_page") != NULL)
 227                 op = 3;
 228         else if (str[0] && str[1] && str[2] && str[3])
 229                 /* ascii string, but commands are not matched. */
 230                 return -EINVAL;
 231
 232         if (op != -1) {
 233                 if (op == 3) {
 234                         if (sscanf(str, "%*s 0x%llx", &address) != 1 &&
 235                             sscanf(str, "%*s %llu", &address) != 1)
 236                                 return -EINVAL;
 237
 238                         data->op = op;
 239                         data->inject.address = address;
 240
 241                         return 0;
 242                 }
 243
 244                 if (amdgpu_ras_find_block_id_by_name(block_name, &block_id))
 245                         return -EINVAL;
 246
 247                 data->head.block = block_id;
 248                 /* only ue and ce errors are supported */
 249                 if (!memcmp("ue", err, 2))
 250                         data->head.type = AMDGPU_RAS_ERROR__MULTI_UNCORRECTABLE;
 251                 else if (!memcmp("ce", err, 2))
 252                         data->head.type = AMDGPU_RAS_ERROR__SINGLE_CORRECTABLE;
 253                 else
 254                         return -EINVAL;
 255
 256                 data->op = op;
 257
 258                 if (op == 2) {
 259                         if (sscanf(str, "%*s %*s %*s 0x%x 0x%llx 0x%llx",
 260                                    &sub_block, &address, &value) != 3 &&
 261                             sscanf(str, "%*s %*s %*s %u %llu %llu",
 262                                    &sub_block, &address, &value) != 3)
 263                                 return -EINVAL;
 264                         data->head.sub_block_index = sub_block;
 265                         data->inject.address = address;
 266                         data->inject.value = value;
 267                 }
 268         } else {
 269                 if (size < sizeof(*data))
 270                         return -EINVAL;
 271
 272                 if (copy_from_user(data, buf, sizeof(*data)))
 273                         return -EINVAL;
 274         }
 275
 276         return 0;
 277 }
 278
 279 /**
 280  * DOC: AMDGPU RAS debugfs control interface
 281  *
 282  * The control interface accepts struct ras_debug_if which has two members.
 283  *
 284  * First member: ras_debug_if::head or ras_debug_if::inject.
 285  *
 286  * head is used to indicate which IP block will be under control.
 287  *
 288  * head has four members, they are block, type, sub_block_index, name.
 289  * block: which IP will be under control.
 290  * type: what kind of error will be enabled/disabled/injected.
 291  * sub_block_index: some IPs have subcomponets. say, GFX, sDMA.
 292  * name: the name of IP.
 293  *
 294  * inject has two more members than head, they are address, value.
 295  * As their names indicate, inject operation will write the
 296  * value to the address.
 297  *
 298  * The second member: struct ras_debug_if::op.
 299  * It has three kinds of operations.
 300  *
 301  * - 0: disable RAS on the block. Take ::head as its data.
 302  * - 1: enable RAS on the block. Take ::head as its data.
 303  * - 2: inject errors on the block. Take ::inject as its data.
 304  *
 305  * How to use the interface?
 306  *
 307  * In a program
 308  *
 309  * Copy the struct ras_debug_if in your code and initialize it.
 310  * Write the struct to the control interface.
 311  *
 312  * From shell
 313  *
 314  * .. code-block:: bash
 315  *
 316  *      echo "disable <block>" > /sys/kernel/debug/dri/<N>/ras/ras_ctrl
 317  *      echo "enable  <block> <error>" > /sys/kernel/debug/dri/<N>/ras/ras_ctrl
 318  *      echo "inject  <block> <error> <sub-block> <address> <value> > /sys/kernel/debug/dri/<N>/ras/ras_ctrl
 319  *
 320  * Where N, is the card which you want to affect.
 321  *
 322  * "disable" requires only the block.
 323  * "enable" requires the block and error type.
 324  * "inject" requires the block, error type, address, and value.
 325  *
 326  * The block is one of: umc, sdma, gfx, etc.
 327  *      see ras_block_string[] for details
 328  *
 329  * The error type is one of: ue, ce, where,
 330  *      ue is multi-uncorrectable
 331  *      ce is single-correctable
 332  *
 333  * The sub-block is a the sub-block index, pass 0 if there is no sub-block.
 334  * The address and value are hexadecimal numbers, leading 0x is optional.
 335  *
 336  * For instance,
 337  *
 338  * .. code-block:: bash
 339  *
 340  *      echo inject umc ue 0x0 0x0 0x0 > /sys/kernel/debug/dri/0/ras/ras_ctrl
 341  *      echo inject umc ce 0 0 0 > /sys/kernel/debug/dri/0/ras/ras_ctrl
 342  *      echo disable umc > /sys/kernel/debug/dri/0/ras/ras_ctrl
 343  *
 344  * How to check the result of the operation?
 345  *
 346  * To check disable/enable, see "ras" features at,
 347  * /sys/class/drm/card[0/1/2...]/device/ras/features
 348  *
 349  * To check inject, see the corresponding error count at,
 350  * /sys/class/drm/card[0/1/2...]/device/ras/[gfx|sdma|umc|...]_err_count
 351  *
 352  * .. note::
 353  *      Operations are only allowed on blocks which are supported.
 354  *      Check the "ras" mask at /sys/module/amdgpu/parameters/ras_mask
 355  *      to see which blocks support RAS on a particular asic.
 356  *
 357  */
 358 static ssize_t amdgpu_ras_debugfs_ctrl_write(struct file *f, const char __user *buf,
 359                 size_t size, loff_t *pos)
 360 {
 361         struct amdgpu_device *adev = (struct amdgpu_device *)file_inode(f)->i_private;
 362         struct ras_debug_if data;
 363         int ret = 0;
 364
 365         if (!amdgpu_ras_get_error_query_ready(adev)) {
 366                 dev_warn(adev->dev, "RAS WARN: error injection "
 367                                 "currently inaccessible\n");
 368                 return size;
 369         }
 370
 371         ret = amdgpu_ras_debugfs_ctrl_parse_data(f, buf, size, pos, &data);
 372         if (ret)
 373                 return -EINVAL;
 374
 375         if (data.op == 3) {
 376                 ret = amdgpu_reserve_page_direct(adev, data.inject.address);
 377                 if (!ret)
 378                         return size;
 379                 else
 380                         return ret;
 381         }
 382
 383         if (!amdgpu_ras_is_supported(adev, data.head.block))
 384                 return -EINVAL;
 385
 386         switch (data.op) {
 387         case 0:
 388                 ret = amdgpu_ras_feature_enable(adev, &data.head, 0);
 389                 break;
 390         case 1:
 391                 ret = amdgpu_ras_feature_enable(adev, &data.head, 1);
 392                 break;
 393         case 2:
 394                 if ((data.inject.address >= adev->gmc.mc_vram_size) ||
 395                     (data.inject.address >= RAS_UMC_INJECT_ADDR_LIMIT)) {
 396                         dev_warn(adev->dev, "RAS WARN: input address "
 397                                         "0x%llx is invalid.",
 398                                         data.inject.address);
 399                         ret = -EINVAL;
 400                         break;
 401                 }
 402
 403                 /* umc ce/ue error injection for a bad page is not allowed */
 404                 if ((data.head.block == AMDGPU_RAS_BLOCK__UMC) &&
 405                     amdgpu_ras_check_bad_page(adev, data.inject.address)) {
 406                         dev_warn(adev->dev, "RAS WARN: 0x%llx has been marked "
 407                                         "as bad before error injection!\n",
 408                                         data.inject.address);
 409                         break;
 410                 }
 411
 412                 /* data.inject.address is offset instead of absolute gpu address */
 413                 ret = amdgpu_ras_error_inject(adev, &data.inject);
 414                 break;
 415         default:
 416                 ret = -EINVAL;
 417                 break;
 418         }
 419
 420         if (ret)
 421                 return -EINVAL;
 422
 423         return size;
 424 }
 425
 426 /**
 427  * DOC: AMDGPU RAS debugfs EEPROM table reset interface
 428  *
 429  * Some boards contain an EEPROM which is used to persistently store a list of
 430  * bad pages which experiences ECC errors in vram.  This interface provides
 431  * a way to reset the EEPROM, e.g., after testing error injection.
 432  *
 433  * Usage:
 434  *
 435  * .. code-block:: bash
 436  *
 437  *      echo 1 > ../ras/ras_eeprom_reset
 438  *
 439  * will reset EEPROM table to 0 entries.
 440  *
 441  */
 442 static ssize_t amdgpu_ras_debugfs_eeprom_write(struct file *f, const char __user *buf,
 443                 size_t size, loff_t *pos)
 444 {
 445         struct amdgpu_device *adev =
 446                 (struct amdgpu_device *)file_inode(f)->i_private;
 447         int ret;
 448
 449         ret = amdgpu_ras_eeprom_reset_table(
 450                         &(amdgpu_ras_get_context(adev)->eeprom_control));
 451
 452         if (ret == 1) {
 453                 amdgpu_ras_get_context(adev)->flags = RAS_DEFAULT_FLAGS;
 454                 return size;
 455         } else {
 456                 return -EIO;
 457         }
 458 }
 459
 460 static const struct file_operations amdgpu_ras_debugfs_ctrl_ops = {
 461         .owner = THIS_MODULE,
 462         .read = NULL,
 463         .write = amdgpu_ras_debugfs_ctrl_write,
 464         .llseek = default_llseek
 465 };
 466
 467 static const struct file_operations amdgpu_ras_debugfs_eeprom_ops = {
 468         .owner = THIS_MODULE,
 469         .read = NULL,
 470         .write = amdgpu_ras_debugfs_eeprom_write,
 471         .llseek = default_llseek
 472 };
 473
 474 /**
 475  * DOC: AMDGPU RAS sysfs Error Count Interface
 476  *
 477  * It allows the user to read the error count for each IP block on the gpu through
 478  * /sys/class/drm/card[0/1/2...]/device/ras/[gfx/sdma/...]_err_count
 479  *
 480  * It outputs the multiple lines which report the uncorrected (ue) and corrected
 481  * (ce) error counts.
 482  *
 483  * The format of one line is below,
 484  *
 485  * [ce|ue]: count
 486  *
 487  * Example:
 488  *
 489  * .. code-block:: bash
 490  *
 491  *      ue: 0
 492  *      ce: 1
 493  *
 494  */
 495 static ssize_t amdgpu_ras_sysfs_read(struct device *dev,
 496                 struct device_attribute *attr, char *buf)
 497 {
 498         struct ras_manager *obj = container_of(attr, struct ras_manager, sysfs_attr);
 499         struct ras_query_if info = {
 500                 .head = obj->head,
 501         };
 502
 503         if (!amdgpu_ras_get_error_query_ready(obj->adev))
 504                 return sysfs_emit(buf, "Query currently inaccessible\n");
 505
 506         if (amdgpu_ras_query_error_status(obj->adev, &info))
 507                 return -EINVAL;
 508
 509
 510         if (obj->adev->asic_type == CHIP_ALDEBARAN) {
 511                 if (amdgpu_ras_reset_error_status(obj->adev, info.head.block))
 512                         DRM_WARN("Failed to reset error counter and error status");
 513         }
 514
 515         return sysfs_emit(buf, "%s: %lu\n%s: %lu\n", "ue", info.ue_count,
 516                           "ce", info.ce_count);
 517 }
 518
 519 /* obj begin */
 520
 521 #define get_obj(obj) do { (obj)->use++; } while (0)
 522 #define alive_obj(obj) ((obj)->use)
 523
 524 static inline void put_obj(struct ras_manager *obj)
 525 {
 526         if (obj && (--obj->use == 0))
 527                 list_del(&obj->node);
 528         if (obj && (obj->use < 0))
 529                 DRM_ERROR("RAS ERROR: Unbalance obj(%s) use\n", obj->head.name);
 530 }
 531
 532 /* make one obj and return it. */
 533 static struct ras_manager *amdgpu_ras_create_obj(struct amdgpu_device *adev,
 534                 struct ras_common_if *head)
 535 {
 536         struct amdgpu_ras *con = amdgpu_ras_get_context(adev);
 537         struct ras_manager *obj;
 538
 539         if (!adev->ras_enabled || !con)
 540                 return NULL;
 541
 542         if (head->block >= AMDGPU_RAS_BLOCK_COUNT)
 543                 return NULL;
 544
 545         obj = &con->objs[head->block];
 546         /* already exist. return obj? */
 547         if (alive_obj(obj))
 548                 return NULL;
 549
 550         obj->head = *head;
 551         obj->adev = adev;
 552         list_add(&obj->node, &con->head);
 553         get_obj(obj);
 554
 555         return obj;
 556 }
 557
 558 /* return an obj equal to head, or the first when head is NULL */
 559 struct ras_manager *amdgpu_ras_find_obj(struct amdgpu_device *adev,
 560                 struct ras_common_if *head)
 561 {
 562         struct amdgpu_ras *con = amdgpu_ras_get_context(adev);
 563         struct ras_manager *obj;
 564         int i;
 565
 566         if (!adev->ras_enabled || !con)
 567                 return NULL;
 568
 569         if (head) {
 570                 if (head->block >= AMDGPU_RAS_BLOCK_COUNT)
 571                         return NULL;
 572
 573                 obj = &con->objs[head->block];
 574
 575                 if (alive_obj(obj)) {
 576                         WARN_ON(head->block != obj->head.block);
 577                         return obj;
 578                 }
 579         } else {
 580                 for (i = 0; i < AMDGPU_RAS_BLOCK_COUNT; i++) {
 581                         obj = &con->objs[i];
 582                         if (alive_obj(obj)) {
 583                                 WARN_ON(i != obj->head.block);
 584                                 return obj;
 585                         }
 586                 }
 587         }
 588
 589         return NULL;
 590 }
 591 /* obj end */
 592
 593 /* feature ctl begin */
 594 static int amdgpu_ras_is_feature_allowed(struct amdgpu_device *adev,
 595                                          struct ras_common_if *head)
 596 {
 597         return adev->ras_hw_enabled & BIT(head->block);
 598 }
 599
 600 static int amdgpu_ras_is_feature_enabled(struct amdgpu_device *adev,
 601                 struct ras_common_if *head)
 602 {
 603         struct amdgpu_ras *con = amdgpu_ras_get_context(adev);
 604
 605         return con->features & BIT(head->block);
 606 }
 607
 608 /*
 609  * if obj is not created, then create one.
 610  * set feature enable flag.
 611  */
 612 static int __amdgpu_ras_feature_enable(struct amdgpu_device *adev,
 613                 struct ras_common_if *head, int enable)
 614 {
 615         struct amdgpu_ras *con = amdgpu_ras_get_context(adev);
 616         struct ras_manager *obj = amdgpu_ras_find_obj(adev, head);
 617
 618         /* If hardware does not support ras, then do not create obj.
 619          * But if hardware support ras, we can create the obj.
 620          * Ras framework checks con->hw_supported to see if it need do
 621          * corresponding initialization.
 622          * IP checks con->support to see if it need disable ras.
 623          */
 624         if (!amdgpu_ras_is_feature_allowed(adev, head))
 625                 return 0;
 626         if (!(!!enable ^ !!amdgpu_ras_is_feature_enabled(adev, head)))
 627                 return 0;
 628
 629         if (enable) {
 630                 if (!obj) {
 631                         obj = amdgpu_ras_create_obj(adev, head);
 632                         if (!obj)
 633                                 return -EINVAL;
 634                 } else {
 635                         /* In case we create obj somewhere else */
 636                         get_obj(obj);
 637                 }
 638                 con->features |= BIT(head->block);
 639         } else {
 640                 if (obj && amdgpu_ras_is_feature_enabled(adev, head)) {
 641                         con->features &= ~BIT(head->block);
 642                         put_obj(obj);
 643                 }
 644         }
 645
 646         return 0;
 647 }
 648
 649 /* wrapper of psp_ras_enable_features */
 650 int amdgpu_ras_feature_enable(struct amdgpu_device *adev,
 651                 struct ras_common_if *head, bool enable)
 652 {
 653         struct amdgpu_ras *con = amdgpu_ras_get_context(adev);
 654         union ta_ras_cmd_input *info;
 655         int ret;
 656
 657         if (!con)
 658                 return -EINVAL;
 659
 660         info = kzalloc(sizeof(union ta_ras_cmd_input), GFP_KERNEL);
 661         if (!info)
 662                 return -ENOMEM;
 663
 664         if (!enable) {
 665                 info->disable_features = (struct ta_ras_disable_features_input) {
 666                         .block_id =  amdgpu_ras_block_to_ta(head->block),
 667                         .error_type = amdgpu_ras_error_to_ta(head->type),
 668                 };
 669         } else {
 670                 info->enable_features = (struct ta_ras_enable_features_input) {
 671                         .block_id =  amdgpu_ras_block_to_ta(head->block),
 672                         .error_type = amdgpu_ras_error_to_ta(head->type),
 673                 };
 674         }
 675
 676         /* Do not enable if it is not allowed. */
 677         WARN_ON(enable && !amdgpu_ras_is_feature_allowed(adev, head));
 678         /* Are we alerady in that state we are going to set? */
 679         if (!(!!enable ^ !!amdgpu_ras_is_feature_enabled(adev, head))) {
 680                 ret = 0;
 681                 goto out;
 682         }
 683
 684         if (!amdgpu_ras_intr_triggered()) {
 685                 ret = psp_ras_enable_features(&adev->psp, info, enable);
 686                 if (ret) {
 687                         dev_err(adev->dev, "ras %s %s failed %d\n",
 688                                 enable ? "enable":"disable",
 689                                 ras_block_str(head->block),
 690                                 ret);
 691                         goto out;
 692                 }
 693         }
 694
 695         /* setup the obj */
 696         __amdgpu_ras_feature_enable(adev, head, enable);
 697         ret = 0;
 698 out:
 699         kfree(info);
 700         return ret;
 701 }
 702
 703 /* Only used in device probe stage and called only once. */
 704 int amdgpu_ras_feature_enable_on_boot(struct amdgpu_device *adev,
 705                 struct ras_common_if *head, bool enable)
 706 {
 707         struct amdgpu_ras *con = amdgpu_ras_get_context(adev);
 708         int ret;
 709
 710         if (!con)
 711                 return -EINVAL;
 712
 713         if (con->flags & AMDGPU_RAS_FLAG_INIT_BY_VBIOS) {
 714                 if (enable) {
 715                         /* There is no harm to issue a ras TA cmd regardless of
 716                          * the currecnt ras state.
 717                          * If current state == target state, it will do nothing
 718                          * But sometimes it requests driver to reset and repost
 719                          * with error code -EAGAIN.
 720                          */
 721                         ret = amdgpu_ras_feature_enable(adev, head, 1);
 722                         /* With old ras TA, we might fail to enable ras.
 723                          * Log it and just setup the object.
 724                          * TODO need remove this WA in the future.
 725                          */
 726                         if (ret == -EINVAL) {
 727                                 ret = __amdgpu_ras_feature_enable(adev, head, 1);
 728                                 if (!ret)
 729                                         dev_info(adev->dev,
 730                                                 "RAS INFO: %s setup object\n",
 731                                                 ras_block_str(head->block));
 732                         }
 733                 } else {
 734                         /* setup the object then issue a ras TA disable cmd.*/
 735                         ret = __amdgpu_ras_feature_enable(adev, head, 1);
 736                         if (ret)
 737                                 return ret;
 738
 739                         /* gfx block ras dsiable cmd must send to ras-ta */
 740                         if (head->block == AMDGPU_RAS_BLOCK__GFX)
 741                                 con->features |= BIT(head->block);
 742
 743                         ret = amdgpu_ras_feature_enable(adev, head, 0);
 744
 745                         /* clean gfx block ras features flag */
 746                         if (adev->ras_enabled && head->block == AMDGPU_RAS_BLOCK__GFX)
 747                                 con->features &= ~BIT(head->block);
 748                 }
 749         } else
 750                 ret = amdgpu_ras_feature_enable(adev, head, enable);
 751
 752         return ret;
 753 }
 754
 755 static int amdgpu_ras_disable_all_features(struct amdgpu_device *adev,
 756                 bool bypass)
 757 {
 758         struct amdgpu_ras *con = amdgpu_ras_get_context(adev);
 759         struct ras_manager *obj, *tmp;
 760
 761         list_for_each_entry_safe(obj, tmp, &con->head, node) {
 762                 /* bypass psp.
 763                  * aka just release the obj and corresponding flags
 764                  */
 765                 if (bypass) {
 766                         if (__amdgpu_ras_feature_enable(adev, &obj->head, 0))
 767                                 break;
 768                 } else {
 769                         if (amdgpu_ras_feature_enable(adev, &obj->head, 0))
 770                                 break;
 771                 }
 772         }
 773
 774         return con->features;
 775 }
 776
 777 static int amdgpu_ras_enable_all_features(struct amdgpu_device *adev,
 778                 bool bypass)
 779 {
 780         struct amdgpu_ras *con = amdgpu_ras_get_context(adev);
 781         int ras_block_count = AMDGPU_RAS_BLOCK_COUNT;
 782         int i;
 783         const enum amdgpu_ras_error_type default_ras_type =
 784                 AMDGPU_RAS_ERROR__NONE;
 785
 786         for (i = 0; i < ras_block_count; i++) {
 787                 struct ras_common_if head = {
 788                         .block = i,
 789                         .type = default_ras_type,
 790                         .sub_block_index = 0,
 791                 };
 792                 strcpy(head.name, ras_block_str(i));
 793                 if (bypass) {
 794                         /*
 795                          * bypass psp. vbios enable ras for us.
 796                          * so just create the obj
 797                          */
 798                         if (__amdgpu_ras_feature_enable(adev, &head, 1))
 799                                 break;
 800                 } else {
 801                         if (amdgpu_ras_feature_enable(adev, &head, 1))
 802                                 break;
 803                 }
 804         }
 805
 806         return con->features;
 807 }
 808 /* feature ctl end */
 809
 810 /* query/inject/cure begin */
 811 int amdgpu_ras_query_error_status(struct amdgpu_device *adev,
 812         struct ras_query_if *info)
 813 {
 814         struct ras_manager *obj = amdgpu_ras_find_obj(adev, &info->head);
 815         struct ras_err_data err_data = {0, 0, 0, NULL};
 816         int i;
 817
 818         if (!obj)
 819                 return -EINVAL;
 820
 821         switch (info->head.block) {
 822         case AMDGPU_RAS_BLOCK__UMC:
 823                 if (adev->umc.ras_funcs &&
 824                     adev->umc.ras_funcs->query_ras_error_count)
 825                         adev->umc.ras_funcs->query_ras_error_count(adev, &err_data);
 826                 /* umc query_ras_error_address is also responsible for clearing
 827                  * error status
 828                  */
 829                 if (adev->umc.ras_funcs &&
 830                     adev->umc.ras_funcs->query_ras_error_address)
 831                         adev->umc.ras_funcs->query_ras_error_address(adev, &err_data);
 832                 break;
 833         case AMDGPU_RAS_BLOCK__SDMA:
 834                 if (adev->sdma.funcs->query_ras_error_count) {
 835                         for (i = 0; i < adev->sdma.num_instances; i++)
 836                                 adev->sdma.funcs->query_ras_error_count(adev, i,
 837                                                                         &err_data);
 838                 }
 839                 break;
 840         case AMDGPU_RAS_BLOCK__GFX:
 841                 if (adev->gfx.ras_funcs &&
 842                     adev->gfx.ras_funcs->query_ras_error_count)
 843                         adev->gfx.ras_funcs->query_ras_error_count(adev, &err_data);
 844
 845                 if (adev->gfx.ras_funcs &&
 846                     adev->gfx.ras_funcs->query_ras_error_status)
 847                         adev->gfx.ras_funcs->query_ras_error_status(adev);
 848                 break;
 849         case AMDGPU_RAS_BLOCK__MMHUB:
 850                 if (adev->mmhub.ras_funcs &&
 851                     adev->mmhub.ras_funcs->query_ras_error_count)
 852                         adev->mmhub.ras_funcs->query_ras_error_count(adev, &err_data);
 853
 854                 if (adev->mmhub.ras_funcs &&
 855                     adev->mmhub.ras_funcs->query_ras_error_status)
 856                         adev->mmhub.ras_funcs->query_ras_error_status(adev);
 857                 break;
 858         case AMDGPU_RAS_BLOCK__PCIE_BIF:
 859                 if (adev->nbio.ras_funcs &&
 860                     adev->nbio.ras_funcs->query_ras_error_count)
 861                         adev->nbio.ras_funcs->query_ras_error_count(adev, &err_data);
 862                 break;
 863         case AMDGPU_RAS_BLOCK__XGMI_WAFL:
 864                 if (adev->gmc.xgmi.ras_funcs &&
 865                     adev->gmc.xgmi.ras_funcs->query_ras_error_count)
 866                         adev->gmc.xgmi.ras_funcs->query_ras_error_count(adev, &err_data);
 867                 break;
 868         case AMDGPU_RAS_BLOCK__HDP:
 869                 if (adev->hdp.ras_funcs &&
 870                     adev->hdp.ras_funcs->query_ras_error_count)
 871                         adev->hdp.ras_funcs->query_ras_error_count(adev, &err_data);
 872                 break;
 873         default:
 874                 break;
 875         }
 876
 877         obj->err_data.ue_count += err_data.ue_count;
 878         obj->err_data.ce_count += err_data.ce_count;
 879
 880         info->ue_count = obj->err_data.ue_count;
 881         info->ce_count = obj->err_data.ce_count;
 882
 883         if (err_data.ce_count) {
 884                 if (adev->smuio.funcs &&
 885                     adev->smuio.funcs->get_socket_id &&
 886                     adev->smuio.funcs->get_die_id) {
 887                         dev_info(adev->dev, "socket: %d, die: %d "
 888                                         "%ld correctable hardware errors "
 889                                         "detected in %s block, no user "
 890                                         "action is needed.\n",
 891                                         adev->smuio.funcs->get_socket_id(adev),
 892                                         adev->smuio.funcs->get_die_id(adev),
 893                                         obj->err_data.ce_count,
 894                                         ras_block_str(info->head.block));
 895                 } else {
 896                         dev_info(adev->dev, "%ld correctable hardware errors "
 897                                         "detected in %s block, no user "
 898                                         "action is needed.\n",
 899                                         obj->err_data.ce_count,
 900                                         ras_block_str(info->head.block));
 901                 }
 902         }
 903         if (err_data.ue_count) {
 904                 if (adev->smuio.funcs &&
 905                     adev->smuio.funcs->get_socket_id &&
 906                     adev->smuio.funcs->get_die_id) {
 907                         dev_info(adev->dev, "socket: %d, die: %d "
 908                                         "%ld uncorrectable hardware errors "
 909                                         "detected in %s block\n",
 910                                         adev->smuio.funcs->get_socket_id(adev),
 911                                         adev->smuio.funcs->get_die_id(adev),
 912                                         obj->err_data.ue_count,
 913                                         ras_block_str(info->head.block));
 914                 } else {
 915                         dev_info(adev->dev, "%ld uncorrectable hardware errors "
 916                                         "detected in %s block\n",
 917                                         obj->err_data.ue_count,
 918                                         ras_block_str(info->head.block));
 919                 }
 920         }
 921
 922         return 0;
 923 }
 924
 925 int amdgpu_ras_reset_error_status(struct amdgpu_device *adev,
 926                 enum amdgpu_ras_block block)
 927 {
 928         if (!amdgpu_ras_is_supported(adev, block))
 929                 return -EINVAL;
 930
 931         switch (block) {
 932         case AMDGPU_RAS_BLOCK__GFX:
 933                 if (adev->gfx.ras_funcs &&
 934                     adev->gfx.ras_funcs->reset_ras_error_count)
 935                         adev->gfx.ras_funcs->reset_ras_error_count(adev);
 936
 937                 if (adev->gfx.ras_funcs &&
 938                     adev->gfx.ras_funcs->reset_ras_error_status)
 939                         adev->gfx.ras_funcs->reset_ras_error_status(adev);
 940                 break;
 941         case AMDGPU_RAS_BLOCK__MMHUB:
 942                 if (adev->mmhub.ras_funcs &&
 943                     adev->mmhub.ras_funcs->reset_ras_error_count)
 944                         adev->mmhub.ras_funcs->reset_ras_error_count(adev);
 945
 946                 if (adev->mmhub.ras_funcs &&
 947                     adev->mmhub.ras_funcs->reset_ras_error_status)
 948                         adev->mmhub.ras_funcs->reset_ras_error_status(adev);
 949                 break;
 950         case AMDGPU_RAS_BLOCK__SDMA:
 951                 if (adev->sdma.funcs->reset_ras_error_count)
 952                         adev->sdma.funcs->reset_ras_error_count(adev);
 953                 break;
 954         case AMDGPU_RAS_BLOCK__HDP:
 955                 if (adev->hdp.ras_funcs &&
 956                     adev->hdp.ras_funcs->reset_ras_error_count)
 957                         adev->hdp.ras_funcs->reset_ras_error_count(adev);
 958                 break;
 959         default:
 960                 break;
 961         }
 962
 963         return 0;
 964 }
 965
 966 /* Trigger XGMI/WAFL error */
 967 static int amdgpu_ras_error_inject_xgmi(struct amdgpu_device *adev,
 968                                  struct ta_ras_trigger_error_input *block_info)
 969 {
 970         int ret;
 971
 972         if (amdgpu_dpm_set_df_cstate(adev, DF_CSTATE_DISALLOW))
 973                 dev_warn(adev->dev, "Failed to disallow df cstate");
 974
 975         if (amdgpu_dpm_allow_xgmi_power_down(adev, false))
 976                 dev_warn(adev->dev, "Failed to disallow XGMI power down");
 977
 978         ret = psp_ras_trigger_error(&adev->psp, block_info);
 979
 980         if (amdgpu_ras_intr_triggered())
 981                 return ret;
 982
 983         if (amdgpu_dpm_allow_xgmi_power_down(adev, true))
 984                 dev_warn(adev->dev, "Failed to allow XGMI power down");
 985
 986         if (amdgpu_dpm_set_df_cstate(adev, DF_CSTATE_ALLOW))
 987                 dev_warn(adev->dev, "Failed to allow df cstate");
 988
 989         return ret;
 990 }
 991
 992 /* wrapper of psp_ras_trigger_error */
 993 int amdgpu_ras_error_inject(struct amdgpu_device *adev,
 994                 struct ras_inject_if *info)
 995 {
 996         struct ras_manager *obj = amdgpu_ras_find_obj(adev, &info->head);
 997         struct ta_ras_trigger_error_input block_info = {
 998                 .block_id =  amdgpu_ras_block_to_ta(info->head.block),
 999                 .inject_error_type = amdgpu_ras_error_to_ta(info->head.type),
1000                 .sub_block_index = info->head.sub_block_index,
1001                 .address = info->address,
1002                 .value = info->value,
1003         };
1004         int ret = 0;
1005
1006         if (!obj)
1007                 return -EINVAL;
1008
1009         /* Calculate XGMI relative offset */
1010         if (adev->gmc.xgmi.num_physical_nodes > 1) {
1011                 block_info.address =
1012                         amdgpu_xgmi_get_relative_phy_addr(adev,
1013                                                           block_info.address);
1014         }
1015
1016         switch (info->head.block) {
1017         case AMDGPU_RAS_BLOCK__GFX:
1018                 if (adev->gfx.ras_funcs &&
1019                     adev->gfx.ras_funcs->ras_error_inject)
1020                         ret = adev->gfx.ras_funcs->ras_error_inject(adev, info);
1021                 else
1022                         ret = -EINVAL;
1023                 break;
1024         case AMDGPU_RAS_BLOCK__UMC:
1025         case AMDGPU_RAS_BLOCK__SDMA:
1026         case AMDGPU_RAS_BLOCK__MMHUB:
1027         case AMDGPU_RAS_BLOCK__PCIE_BIF:
1028                 ret = psp_ras_trigger_error(&adev->psp, &block_info);
1029                 break;
1030         case AMDGPU_RAS_BLOCK__XGMI_WAFL:
1031                 ret = amdgpu_ras_error_inject_xgmi(adev, &block_info);
1032                 break;
1033         default:
1034                 dev_info(adev->dev, "%s error injection is not supported yet\n",
1035                          ras_block_str(info->head.block));
1036                 ret = -EINVAL;
1037         }
1038
1039         if (ret)
1040                 dev_err(adev->dev, "ras inject %s failed %d\n",
1041                         ras_block_str(info->head.block), ret);
1042
1043         return ret;
1044 }
1045
1046 /* get the total error counts on all IPs */
1047 void amdgpu_ras_query_error_count(struct amdgpu_device *adev,
1048                                   unsigned long *ce_count,
1049                                   unsigned long *ue_count)
1050 {
1051         struct amdgpu_ras *con = amdgpu_ras_get_context(adev);
1052         struct ras_manager *obj;
1053         unsigned long ce, ue;
1054
1055         if (!adev->ras_enabled || !con)
1056                 return;
1057
1058         ce = 0;
1059         ue = 0;
1060         list_for_each_entry(obj, &con->head, node) {
1061                 struct ras_query_if info = {
1062                         .head = obj->head,
1063                 };
1064
1065                 if (amdgpu_ras_query_error_status(adev, &info))
1066                         return;
1067
1068                 ce += info.ce_count;
1069                 ue += info.ue_count;
1070         }
1071
1072         if (ce_count)
1073                 *ce_count = ce;
1074
1075         if (ue_count)
1076                 *ue_count = ue;
1077 }
1078 /* query/inject/cure end */
1079
1080
1081 /* sysfs begin */
1082
1083 static int amdgpu_ras_badpages_read(struct amdgpu_device *adev,
1084                 struct ras_badpage **bps, unsigned int *count);
1085
1086 static char *amdgpu_ras_badpage_flags_str(unsigned int flags)
1087 {
1088         switch (flags) {
1089         case AMDGPU_RAS_RETIRE_PAGE_RESERVED:
1090                 return "R";
1091         case AMDGPU_RAS_RETIRE_PAGE_PENDING:
1092                 return "P";
1093         case AMDGPU_RAS_RETIRE_PAGE_FAULT:
1094         default:
1095                 return "F";
1096         }
1097 }
1098
1099 /**
1100  * DOC: AMDGPU RAS sysfs gpu_vram_bad_pages Interface
1101  *
1102  * It allows user to read the bad pages of vram on the gpu through
1103  * /sys/class/drm/card[0/1/2...]/device/ras/gpu_vram_bad_pages
1104  *
1105  * It outputs multiple lines, and each line stands for one gpu page.
1106  *
1107  * The format of one line is below,
1108  * gpu pfn : gpu page size : flags
1109  *
1110  * gpu pfn and gpu page size are printed in hex format.
1111  * flags can be one of below character,
1112  *
1113  * R: reserved, this gpu page is reserved and not able to use.
1114  *
1115  * P: pending for reserve, this gpu page is marked as bad, will be reserved
1116  * in next window of page_reserve.
1117  *
1118  * F: unable to reserve. this gpu page can't be reserved due to some reasons.
1119  *
1120  * Examples:
1121  *
1122  * .. code-block:: bash
1123  *
1124  *      0x00000001 : 0x00001000 : R
1125  *      0x00000002 : 0x00001000 : P
1126  *
1127  */
1128
1129 static ssize_t amdgpu_ras_sysfs_badpages_read(struct file *f,
1130                 struct kobject *kobj, struct bin_attribute *attr,
1131                 char *buf, loff_t ppos, size_t count)
1132 {
1133         struct amdgpu_ras *con =
1134                 container_of(attr, struct amdgpu_ras, badpages_attr);
1135         struct amdgpu_device *adev = con->adev;
1136         const unsigned int element_size =
1137                 sizeof("0xabcdabcd : 0x12345678 : R\n") - 1;
1138         unsigned int start = div64_ul(ppos + element_size - 1, element_size);
1139         unsigned int end = div64_ul(ppos + count - 1, element_size);
1140         ssize_t s = 0;
1141         struct ras_badpage *bps = NULL;
1142         unsigned int bps_count = 0;
1143
1144         memset(buf, 0, count);
1145
1146         if (amdgpu_ras_badpages_read(adev, &bps, &bps_count))
1147                 return 0;
1148
1149         for (; start < end && start < bps_count; start++)
1150                 s += scnprintf(&buf[s], element_size + 1,
1151                                 "0x%08x : 0x%08x : %1s\n",
1152                                 bps[start].bp,
1153                                 bps[start].size,
1154                                 amdgpu_ras_badpage_flags_str(bps[start].flags));
1155
1156         kfree(bps);
1157
1158         return s;
1159 }
1160
1161 static ssize_t amdgpu_ras_sysfs_features_read(struct device *dev,
1162                 struct device_attribute *attr, char *buf)
1163 {
1164         struct amdgpu_ras *con =
1165                 container_of(attr, struct amdgpu_ras, features_attr);
1166
1167         return scnprintf(buf, PAGE_SIZE, "feature mask: 0x%x\n", con->features);
1168 }
1169
1170 static void amdgpu_ras_sysfs_remove_bad_page_node(struct amdgpu_device *adev)
1171 {
1172         struct amdgpu_ras *con = amdgpu_ras_get_context(adev);
1173
1174         sysfs_remove_file_from_group(&adev->dev->kobj,
1175                                 &con->badpages_attr.attr,
1176                                 RAS_FS_NAME);
1177 }
1178
1179 static int amdgpu_ras_sysfs_remove_feature_node(struct amdgpu_device *adev)
1180 {
1181         struct amdgpu_ras *con = amdgpu_ras_get_context(adev);
1182         struct attribute *attrs[] = {
1183                 &con->features_attr.attr,
1184                 NULL
1185         };
1186         struct attribute_group group = {
1187                 .name = RAS_FS_NAME,
1188                 .attrs = attrs,
1189         };
1190
1191         sysfs_remove_group(&adev->dev->kobj, &group);
1192
1193         return 0;
1194 }
1195
1196 int amdgpu_ras_sysfs_create(struct amdgpu_device *adev,
1197                 struct ras_fs_if *head)
1198 {
1199         struct ras_manager *obj = amdgpu_ras_find_obj(adev, &head->head);
1200
1201         if (!obj || obj->attr_inuse)
1202                 return -EINVAL;
1203
1204         get_obj(obj);
1205
1206         memcpy(obj->fs_data.sysfs_name,
1207                         head->sysfs_name,
1208                         sizeof(obj->fs_data.sysfs_name));
1209
1210         obj->sysfs_attr = (struct device_attribute){
1211                 .attr = {
1212                         .name = obj->fs_data.sysfs_name,
1213                         .mode = S_IRUGO,
1214                 },
1215                         .show = amdgpu_ras_sysfs_read,
1216         };
1217         sysfs_attr_init(&obj->sysfs_attr.attr);
1218
1219         if (sysfs_add_file_to_group(&adev->dev->kobj,
1220                                 &obj->sysfs_attr.attr,
1221                                 RAS_FS_NAME)) {
1222                 put_obj(obj);
1223                 return -EINVAL;
1224         }
1225
1226         obj->attr_inuse = 1;
1227
1228         return 0;
1229 }
1230
1231 int amdgpu_ras_sysfs_remove(struct amdgpu_device *adev,
1232                 struct ras_common_if *head)
1233 {
1234         struct ras_manager *obj = amdgpu_ras_find_obj(adev, head);
1235
1236         if (!obj || !obj->attr_inuse)
1237                 return -EINVAL;
1238
1239         sysfs_remove_file_from_group(&adev->dev->kobj,
1240                                 &obj->sysfs_attr.attr,
1241                                 RAS_FS_NAME);
1242         obj->attr_inuse = 0;
1243         put_obj(obj);
1244
1245         return 0;
1246 }
1247
1248 static int amdgpu_ras_sysfs_remove_all(struct amdgpu_device *adev)
1249 {
1250         struct amdgpu_ras *con = amdgpu_ras_get_context(adev);
1251         struct ras_manager *obj, *tmp;
1252
1253         list_for_each_entry_safe(obj, tmp, &con->head, node) {
1254                 amdgpu_ras_sysfs_remove(adev, &obj->head);
1255         }
1256
1257         if (amdgpu_bad_page_threshold != 0)
1258                 amdgpu_ras_sysfs_remove_bad_page_node(adev);
1259
1260         amdgpu_ras_sysfs_remove_feature_node(adev);
1261
1262         return 0;
1263 }
1264 /* sysfs end */
1265
1266 /**
1267  * DOC: AMDGPU RAS Reboot Behavior for Unrecoverable Errors
1268  *
1269  * Normally when there is an uncorrectable error, the driver will reset
1270  * the GPU to recover.  However, in the event of an unrecoverable error,
1271  * the driver provides an interface to reboot the system automatically
1272  * in that event.
1273  *
1274  * The following file in debugfs provides that interface:
1275  * /sys/kernel/debug/dri/[0/1/2...]/ras/auto_reboot
1276  *
1277  * Usage:
1278  *
1279  * .. code-block:: bash
1280  *
1281  *      echo true > .../ras/auto_reboot
1282  *
1283  */
1284 /* debugfs begin */
1285 static struct dentry *amdgpu_ras_debugfs_create_ctrl_node(struct amdgpu_device *adev)
1286 {
1287         struct amdgpu_ras *con = amdgpu_ras_get_context(adev);
1288         struct drm_minor  *minor = adev_to_drm(adev)->primary;
1289         struct dentry     *dir;
1290
1291         dir = debugfs_create_dir(RAS_FS_NAME, minor->debugfs_root);
1292         debugfs_create_file("ras_ctrl", S_IWUGO | S_IRUGO, dir, adev,
1293                             &amdgpu_ras_debugfs_ctrl_ops);
1294         debugfs_create_file("ras_eeprom_reset", S_IWUGO | S_IRUGO, dir, adev,
1295                             &amdgpu_ras_debugfs_eeprom_ops);
1296         debugfs_create_u32("bad_page_cnt_threshold", 0444, dir,
1297                            &con->bad_page_cnt_threshold);
1298         debugfs_create_x32("ras_hw_enabled", 0444, dir, &adev->ras_hw_enabled);
1299         debugfs_create_x32("ras_enabled", 0444, dir, &adev->ras_enabled);
1300
1301         /*
1302          * After one uncorrectable error happens, usually GPU recovery will
1303          * be scheduled. But due to the known problem in GPU recovery failing
1304          * to bring GPU back, below interface provides one direct way to
1305          * user to reboot system automatically in such case within
1306          * ERREVENT_ATHUB_INTERRUPT generated. Normal GPU recovery routine
1307          * will never be called.
1308          */
1309         debugfs_create_bool("auto_reboot", S_IWUGO | S_IRUGO, dir, &con->reboot);
1310
1311         /*
1312          * User could set this not to clean up hardware's error count register
1313          * of RAS IPs during ras recovery.
1314          */
1315         debugfs_create_bool("disable_ras_err_cnt_harvest", 0644, dir,
1316                             &con->disable_ras_err_cnt_harvest);
1317         return dir;
1318 }
1319
1320 static void amdgpu_ras_debugfs_create(struct amdgpu_device *adev,
1321                                       struct ras_fs_if *head,
1322                                       struct dentry *dir)
1323 {
1324         struct ras_manager *obj = amdgpu_ras_find_obj(adev, &head->head);
1325
1326         if (!obj || !dir)
1327                 return;
1328
1329         get_obj(obj);
1330
1331         memcpy(obj->fs_data.debugfs_name,
1332                         head->debugfs_name,
1333                         sizeof(obj->fs_data.debugfs_name));
1334
1335         debugfs_create_file(obj->fs_data.debugfs_name, S_IWUGO | S_IRUGO, dir,
1336                             obj, &amdgpu_ras_debugfs_ops);
1337 }
1338
1339 void amdgpu_ras_debugfs_create_all(struct amdgpu_device *adev)
1340 {
1341         struct amdgpu_ras *con = amdgpu_ras_get_context(adev);
1342         struct dentry *dir;
1343         struct ras_manager *obj;
1344         struct ras_fs_if fs_info;
1345
1346         /*
1347          * it won't be called in resume path, no need to check
1348          * suspend and gpu reset status
1349          */
1350         if (!IS_ENABLED(CONFIG_DEBUG_FS) || !con)
1351                 return;
1352
1353         dir = amdgpu_ras_debugfs_create_ctrl_node(adev);
1354
1355         list_for_each_entry(obj, &con->head, node) {
1356                 if (amdgpu_ras_is_supported(adev, obj->head.block) &&
1357                         (obj->attr_inuse == 1)) {
1358                         sprintf(fs_info.debugfs_name, "%s_err_inject",
1359                                         ras_block_str(obj->head.block));
1360                         fs_info.head = obj->head;
1361                         amdgpu_ras_debugfs_create(adev, &fs_info, dir);
1362                 }
1363         }
1364 }
1365
1366 /* debugfs end */
1367
1368 /* ras fs */
1369 static BIN_ATTR(gpu_vram_bad_pages, S_IRUGO,
1370                 amdgpu_ras_sysfs_badpages_read, NULL, 0);
1371 static DEVICE_ATTR(features, S_IRUGO,
1372                 amdgpu_ras_sysfs_features_read, NULL);
1373 static int amdgpu_ras_fs_init(struct amdgpu_device *adev)
1374 {
1375         struct amdgpu_ras *con = amdgpu_ras_get_context(adev);
1376         struct attribute_group group = {
1377                 .name = RAS_FS_NAME,
1378         };
1379         struct attribute *attrs[] = {
1380                 &con->features_attr.attr,
1381                 NULL
1382         };
1383         struct bin_attribute *bin_attrs[] = {
1384                 NULL,
1385                 NULL,
1386         };
1387         int r;
1388
1389         /* add features entry */
1390         con->features_attr = dev_attr_features;
1391         group.attrs = attrs;
1392         sysfs_attr_init(attrs[0]);
1393
1394         if (amdgpu_bad_page_threshold != 0) {
1395                 /* add bad_page_features entry */
1396                 bin_attr_gpu_vram_bad_pages.private = NULL;
1397                 con->badpages_attr = bin_attr_gpu_vram_bad_pages;
1398                 bin_attrs[0] = &con->badpages_attr;
1399                 group.bin_attrs = bin_attrs;
1400                 sysfs_bin_attr_init(bin_attrs[0]);
1401         }
1402
1403         r = sysfs_create_group(&adev->dev->kobj, &group);
1404         if (r)
1405                 dev_err(adev->dev, "Failed to create RAS sysfs group!");
1406
1407         return 0;
1408 }
1409
1410 static int amdgpu_ras_fs_fini(struct amdgpu_device *adev)
1411 {
1412         struct amdgpu_ras *con = amdgpu_ras_get_context(adev);
1413         struct ras_manager *con_obj, *ip_obj, *tmp;
1414
1415         if (IS_ENABLED(CONFIG_DEBUG_FS)) {
1416                 list_for_each_entry_safe(con_obj, tmp, &con->head, node) {
1417                         ip_obj = amdgpu_ras_find_obj(adev, &con_obj->head);
1418                         if (ip_obj)
1419                                 put_obj(ip_obj);
1420                 }
1421         }
1422
1423         amdgpu_ras_sysfs_remove_all(adev);
1424         return 0;
1425 }
1426 /* ras fs end */
1427
1428 /* ih begin */
1429 static void amdgpu_ras_interrupt_handler(struct ras_manager *obj)
1430 {
1431         struct ras_ih_data *data = &obj->ih_data;
1432         struct amdgpu_iv_entry entry;
1433         int ret;
1434         struct ras_err_data err_data = {0, 0, 0, NULL};
1435
1436         while (data->rptr != data->wptr) {
1437                 rmb();
1438                 memcpy(&entry, &data->ring[data->rptr],
1439                                 data->element_size);
1440
1441                 wmb();
1442                 data->rptr = (data->aligned_element_size +
1443                                 data->rptr) % data->ring_size;
1444
1445                 /* Let IP handle its data, maybe we need get the output
1446                  * from the callback to udpate the error type/count, etc
1447                  */
1448                 if (data->cb) {
1449                         ret = data->cb(obj->adev, &err_data, &entry);
1450                         /* ue will trigger an interrupt, and in that case
1451                          * we need do a reset to recovery the whole system.
1452                          * But leave IP do that recovery, here we just dispatch
1453                          * the error.
1454                          */
1455                         if (ret == AMDGPU_RAS_SUCCESS) {
1456                                 /* these counts could be left as 0 if
1457                                  * some blocks do not count error number
1458                                  */
1459                                 obj->err_data.ue_count += err_data.ue_count;
1460                                 obj->err_data.ce_count += err_data.ce_count;
1461                         }
1462                 }
1463         }
1464 }
1465
1466 static void amdgpu_ras_interrupt_process_handler(struct work_struct *work)
1467 {
1468         struct ras_ih_data *data =
1469                 container_of(work, struct ras_ih_data, ih_work);
1470         struct ras_manager *obj =
1471                 container_of(data, struct ras_manager, ih_data);
1472
1473         amdgpu_ras_interrupt_handler(obj);
1474 }
1475
1476 int amdgpu_ras_interrupt_dispatch(struct amdgpu_device *adev,
1477                 struct ras_dispatch_if *info)
1478 {
1479         struct ras_manager *obj = amdgpu_ras_find_obj(adev, &info->head);
1480         struct ras_ih_data *data = &obj->ih_data;
1481
1482         if (!obj)
1483                 return -EINVAL;
1484
1485         if (data->inuse == 0)
1486                 return 0;
1487
1488         /* Might be overflow... */
1489         memcpy(&data->ring[data->wptr], info->entry,
1490                         data->element_size);
1491
1492         wmb();
1493         data->wptr = (data->aligned_element_size +
1494                         data->wptr) % data->ring_size;
1495
1496         schedule_work(&data->ih_work);
1497
1498         return 0;
1499 }
1500
1501 int amdgpu_ras_interrupt_remove_handler(struct amdgpu_device *adev,
1502                 struct ras_ih_if *info)
1503 {
1504         struct ras_manager *obj = amdgpu_ras_find_obj(adev, &info->head);
1505         struct ras_ih_data *data;
1506
1507         if (!obj)
1508                 return -EINVAL;
1509
1510         data = &obj->ih_data;
1511         if (data->inuse == 0)
1512                 return 0;
1513
1514         cancel_work_sync(&data->ih_work);
1515
1516         kfree(data->ring);
1517         memset(data, 0, sizeof(*data));
1518         put_obj(obj);
1519
1520         return 0;
1521 }
1522
1523 int amdgpu_ras_interrupt_add_handler(struct amdgpu_device *adev,
1524                 struct ras_ih_if *info)
1525 {
1526         struct ras_manager *obj = amdgpu_ras_find_obj(adev, &info->head);
1527         struct ras_ih_data *data;
1528
1529         if (!obj) {
1530                 /* in case we registe the IH before enable ras feature */
1531                 obj = amdgpu_ras_create_obj(adev, &info->head);
1532                 if (!obj)
1533                         return -EINVAL;
1534         } else
1535                 get_obj(obj);
1536
1537         data = &obj->ih_data;
1538         /* add the callback.etc */
1539         *data = (struct ras_ih_data) {
1540                 .inuse = 0,
1541                 .cb = info->cb,
1542                 .element_size = sizeof(struct amdgpu_iv_entry),
1543                 .rptr = 0,
1544                 .wptr = 0,
1545         };
1546
1547         INIT_WORK(&data->ih_work, amdgpu_ras_interrupt_process_handler);
1548
1549         data->aligned_element_size = ALIGN(data->element_size, 8);
1550         /* the ring can store 64 iv entries. */
1551         data->ring_size = 64 * data->aligned_element_size;
1552         data->ring = kmalloc(data->ring_size, GFP_KERNEL);
1553         if (!data->ring) {
1554                 put_obj(obj);
1555                 return -ENOMEM;
1556         }
1557
1558         /* IH is ready */
1559         data->inuse = 1;
1560
1561         return 0;
1562 }
1563
1564 static int amdgpu_ras_interrupt_remove_all(struct amdgpu_device *adev)
1565 {
1566         struct amdgpu_ras *con = amdgpu_ras_get_context(adev);
1567         struct ras_manager *obj, *tmp;
1568
1569         list_for_each_entry_safe(obj, tmp, &con->head, node) {
1570                 struct ras_ih_if info = {
1571                         .head = obj->head,
1572                 };
1573                 amdgpu_ras_interrupt_remove_handler(adev, &info);
1574         }
1575
1576         return 0;
1577 }
1578 /* ih end */
1579
1580 /* traversal all IPs except NBIO to query error counter */
1581 static void amdgpu_ras_log_on_err_counter(struct amdgpu_device *adev)
1582 {
1583         struct amdgpu_ras *con = amdgpu_ras_get_context(adev);
1584         struct ras_manager *obj;
1585
1586         if (!adev->ras_enabled || !con)
1587                 return;
1588
1589         list_for_each_entry(obj, &con->head, node) {
1590                 struct ras_query_if info = {
1591                         .head = obj->head,
1592                 };
1593
1594                 /*
1595                  * PCIE_BIF IP has one different isr by ras controller
1596                  * interrupt, the specific ras counter query will be
1597                  * done in that isr. So skip such block from common
1598                  * sync flood interrupt isr calling.
1599                  */
1600                 if (info.head.block == AMDGPU_RAS_BLOCK__PCIE_BIF)
1601                         continue;
1602
1603                 amdgpu_ras_query_error_status(adev, &info);
1604         }
1605 }
1606
1607 /* Parse RdRspStatus and WrRspStatus */
1608 static void amdgpu_ras_error_status_query(struct amdgpu_device *adev,
1609                                           struct ras_query_if *info)
1610 {
1611         /*
1612          * Only two block need to query read/write
1613          * RspStatus at current state
1614          */
1615         switch (info->head.block) {
1616         case AMDGPU_RAS_BLOCK__GFX:
1617                 if (adev->gfx.ras_funcs &&
1618                     adev->gfx.ras_funcs->query_ras_error_status)
1619                         adev->gfx.ras_funcs->query_ras_error_status(adev);
1620                 break;
1621         case AMDGPU_RAS_BLOCK__MMHUB:
1622                 if (adev->mmhub.ras_funcs &&
1623                     adev->mmhub.ras_funcs->query_ras_error_status)
1624                         adev->mmhub.ras_funcs->query_ras_error_status(adev);
1625                 break;
1626         default:
1627                 break;
1628         }
1629 }
1630
1631 static void amdgpu_ras_query_err_status(struct amdgpu_device *adev)
1632 {
1633         struct amdgpu_ras *con = amdgpu_ras_get_context(adev);
1634         struct ras_manager *obj;
1635
1636         if (!adev->ras_enabled || !con)
1637                 return;
1638
1639         list_for_each_entry(obj, &con->head, node) {
1640                 struct ras_query_if info = {
1641                         .head = obj->head,
1642                 };
1643
1644                 amdgpu_ras_error_status_query(adev, &info);
1645         }
1646 }
1647
1648 /* recovery begin */
1649
1650 /* return 0 on success.
1651  * caller need free bps.
1652  */
1653 static int amdgpu_ras_badpages_read(struct amdgpu_device *adev,
1654                 struct ras_badpage **bps, unsigned int *count)
1655 {
1656         struct amdgpu_ras *con = amdgpu_ras_get_context(adev);
1657         struct ras_err_handler_data *data;
1658         int i = 0;
1659         int ret = 0, status;
1660
1661         if (!con || !con->eh_data || !bps || !count)
1662                 return -EINVAL;
1663
1664         mutex_lock(&con->recovery_lock);
1665         data = con->eh_data;
1666         if (!data || data->count == 0) {
1667                 *bps = NULL;
1668                 ret = -EINVAL;
1669                 goto out;
1670         }
1671
1672         *bps = kmalloc(sizeof(struct ras_badpage) * data->count, GFP_KERNEL);
1673         if (!*bps) {
1674                 ret = -ENOMEM;
1675                 goto out;
1676         }
1677
1678         for (; i < data->count; i++) {
1679                 (*bps)[i] = (struct ras_badpage){
1680                         .bp = data->bps[i].retired_page,
1681                         .size = AMDGPU_GPU_PAGE_SIZE,
1682                         .flags = AMDGPU_RAS_RETIRE_PAGE_RESERVED,
1683                 };
1684                 status = amdgpu_vram_mgr_query_page_status(
1685                                 ttm_manager_type(&adev->mman.bdev, TTM_PL_VRAM),
1686                                 data->bps[i].retired_page);
1687                 if (status == -EBUSY)
1688                         (*bps)[i].flags = AMDGPU_RAS_RETIRE_PAGE_PENDING;
1689                 else if (status == -ENOENT)
1690                         (*bps)[i].flags = AMDGPU_RAS_RETIRE_PAGE_FAULT;
1691         }
1692
1693         *count = data->count;
1694 out:
1695         mutex_unlock(&con->recovery_lock);
1696         return ret;
1697 }
1698
1699 static void amdgpu_ras_do_recovery(struct work_struct *work)
1700 {
1701         struct amdgpu_ras *ras =
1702                 container_of(work, struct amdgpu_ras, recovery_work);
1703         struct amdgpu_device *remote_adev = NULL;
1704         struct amdgpu_device *adev = ras->adev;
1705         struct list_head device_list, *device_list_handle =  NULL;
1706
1707         if (!ras->disable_ras_err_cnt_harvest) {
1708                 struct amdgpu_hive_info *hive = amdgpu_get_xgmi_hive(adev);
1709
1710                 /* Build list of devices to query RAS related errors */
1711                 if  (hive && adev->gmc.xgmi.num_physical_nodes > 1) {
1712                         device_list_handle = &hive->device_list;
1713                 } else {
1714                         INIT_LIST_HEAD(&device_list);
1715                         list_add_tail(&adev->gmc.xgmi.head, &device_list);
1716                         device_list_handle = &device_list;
1717                 }
1718
1719                 list_for_each_entry(remote_adev,
1720                                 device_list_handle, gmc.xgmi.head) {
1721                         amdgpu_ras_query_err_status(remote_adev);
1722                         amdgpu_ras_log_on_err_counter(remote_adev);
1723                 }
1724
1725                 amdgpu_put_xgmi_hive(hive);
1726         }
1727
1728         if (amdgpu_device_should_recover_gpu(ras->adev))
1729                 amdgpu_device_gpu_recover(ras->adev, NULL);
1730         atomic_set(&ras->in_recovery, 0);
1731 }
1732
1733 /* alloc/realloc bps array */
1734 static int amdgpu_ras_realloc_eh_data_space(struct amdgpu_device *adev,
1735                 struct ras_err_handler_data *data, int pages)
1736 {
1737         unsigned int old_space = data->count + data->space_left;
1738         unsigned int new_space = old_space + pages;
1739         unsigned int align_space = ALIGN(new_space, 512);
1740         void *bps = kmalloc(align_space * sizeof(*data->bps), GFP_KERNEL);
1741
1742         if (!bps) {
1743                 kfree(bps);
1744                 return -ENOMEM;
1745         }
1746
1747         if (data->bps) {
1748                 memcpy(bps, data->bps,
1749                                 data->count * sizeof(*data->bps));
1750                 kfree(data->bps);
1751         }
1752
1753         data->bps = bps;
1754         data->space_left += align_space - old_space;
1755         return 0;
1756 }
1757
1758 /* it deal with vram only. */
1759 int amdgpu_ras_add_bad_pages(struct amdgpu_device *adev,
1760                 struct eeprom_table_record *bps, int pages)
1761 {
1762         struct amdgpu_ras *con = amdgpu_ras_get_context(adev);
1763         struct ras_err_handler_data *data;
1764         int ret = 0;
1765         uint32_t i;
1766
1767         if (!con || !con->eh_data || !bps || pages <= 0)
1768                 return 0;
1769
1770         mutex_lock(&con->recovery_lock);
1771         data = con->eh_data;
1772         if (!data)
1773                 goto out;
1774
1775         for (i = 0; i < pages; i++) {
1776                 if (amdgpu_ras_check_bad_page_unlock(con,
1777                         bps[i].retired_page << AMDGPU_GPU_PAGE_SHIFT))
1778                         continue;
1779
1780                 if (!data->space_left &&
1781                         amdgpu_ras_realloc_eh_data_space(adev, data, 256)) {
1782                         ret = -ENOMEM;
1783                         goto out;
1784                 }
1785
1786                 amdgpu_vram_mgr_reserve_range(
1787                         ttm_manager_type(&adev->mman.bdev, TTM_PL_VRAM),
1788                         bps[i].retired_page << AMDGPU_GPU_PAGE_SHIFT,
1789                         AMDGPU_GPU_PAGE_SIZE);
1790
1791                 memcpy(&data->bps[data->count], &bps[i], sizeof(*data->bps));
1792                 data->count++;
1793                 data->space_left--;
1794         }
1795 out:
1796         mutex_unlock(&con->recovery_lock);
1797
1798         return ret;
1799 }
1800
1801 /*
1802  * write error record array to eeprom, the function should be
1803  * protected by recovery_lock
1804  */
1805 int amdgpu_ras_save_bad_pages(struct amdgpu_device *adev)
1806 {
1807         struct amdgpu_ras *con = amdgpu_ras_get_context(adev);
1808         struct ras_err_handler_data *data;
1809         struct amdgpu_ras_eeprom_control *control;
1810         int save_count;
1811
1812         if (!con || !con->eh_data)
1813                 return 0;
1814
1815         control = &con->eeprom_control;
1816         data = con->eh_data;
1817         save_count = data->count - control->num_recs;
1818         /* only new entries are saved */
1819         if (save_count > 0) {
1820                 if (amdgpu_ras_eeprom_process_recods(control,
1821                                                         &data->bps[control->num_recs],
1822                                                         true,
1823                                                         save_count)) {
1824                         dev_err(adev->dev, "Failed to save EEPROM table data!");
1825                         return -EIO;
1826                 }
1827
1828                 dev_info(adev->dev, "Saved %d pages to EEPROM table.\n", save_count);
1829         }
1830
1831         return 0;
1832 }
1833
1834 /*
1835  * read error record array in eeprom and reserve enough space for
1836  * storing new bad pages
1837  */
1838 static int amdgpu_ras_load_bad_pages(struct amdgpu_device *adev)
1839 {
1840         struct amdgpu_ras_eeprom_control *control =
1841                                         &adev->psp.ras.ras->eeprom_control;
1842         struct eeprom_table_record *bps = NULL;
1843         int ret = 0;
1844
1845         /* no bad page record, skip eeprom access */
1846         if (!control->num_recs || (amdgpu_bad_page_threshold == 0))
1847                 return ret;
1848
1849         bps = kcalloc(control->num_recs, sizeof(*bps), GFP_KERNEL);
1850         if (!bps)
1851                 return -ENOMEM;
1852
1853         if (amdgpu_ras_eeprom_process_recods(control, bps, false,
1854                 control->num_recs)) {
1855                 dev_err(adev->dev, "Failed to load EEPROM table records!");
1856                 ret = -EIO;
1857                 goto out;
1858         }
1859
1860         ret = amdgpu_ras_add_bad_pages(adev, bps, control->num_recs);
1861
1862 out:
1863         kfree(bps);
1864         return ret;
1865 }
1866
1867 static bool amdgpu_ras_check_bad_page_unlock(struct amdgpu_ras *con,
1868                                 uint64_t addr)
1869 {
1870         struct ras_err_handler_data *data = con->eh_data;
1871         int i;
1872
1873         addr >>= AMDGPU_GPU_PAGE_SHIFT;
1874         for (i = 0; i < data->count; i++)
1875                 if (addr == data->bps[i].retired_page)
1876                         return true;
1877
1878         return false;
1879 }
1880
1881 /*
1882  * check if an address belongs to bad page
1883  *
1884  * Note: this check is only for umc block
1885  */
1886 static bool amdgpu_ras_check_bad_page(struct amdgpu_device *adev,
1887                                 uint64_t addr)
1888 {
1889         struct amdgpu_ras *con = amdgpu_ras_get_context(adev);
1890         bool ret = false;
1891
1892         if (!con || !con->eh_data)
1893                 return ret;
1894
1895         mutex_lock(&con->recovery_lock);
1896         ret = amdgpu_ras_check_bad_page_unlock(con, addr);
1897         mutex_unlock(&con->recovery_lock);
1898         return ret;
1899 }
1900
1901 static void amdgpu_ras_validate_threshold(struct amdgpu_device *adev,
1902                                         uint32_t max_length)
1903 {
1904         struct amdgpu_ras *con = amdgpu_ras_get_context(adev);
1905         int tmp_threshold = amdgpu_bad_page_threshold;
1906         u64 val;
1907
1908         /*
1909          * Justification of value bad_page_cnt_threshold in ras structure
1910          *
1911          * Generally, -1 <= amdgpu_bad_page_threshold <= max record length
1912          * in eeprom, and introduce two scenarios accordingly.
1913          *
1914          * Bad page retirement enablement:
1915          *    - If amdgpu_bad_page_threshold = -1,
1916          *      bad_page_cnt_threshold = typical value by formula.
1917          *
1918          *    - When the value from user is 0 < amdgpu_bad_page_threshold <
1919          *      max record length in eeprom, use it directly.
1920          *
1921          * Bad page retirement disablement:
1922          *    - If amdgpu_bad_page_threshold = 0, bad page retirement
1923          *      functionality is disabled, and bad_page_cnt_threshold will
1924          *      take no effect.
1925          */
1926
1927         if (tmp_threshold < -1)
1928                 tmp_threshold = -1;
1929         else if (tmp_threshold > max_length)
1930                 tmp_threshold = max_length;
1931
1932         if (tmp_threshold == -1) {
1933                 val = adev->gmc.mc_vram_size;
1934                 do_div(val, RAS_BAD_PAGE_RATE);
1935                 con->bad_page_cnt_threshold = min(lower_32_bits(val),
1936                                                 max_length);
1937         } else {
1938                 con->bad_page_cnt_threshold = tmp_threshold;
1939         }
1940 }
1941
1942 int amdgpu_ras_recovery_init(struct amdgpu_device *adev)
1943 {
1944         struct amdgpu_ras *con = amdgpu_ras_get_context(adev);
1945         struct ras_err_handler_data **data;
1946         uint32_t max_eeprom_records_len = 0;
1947         bool exc_err_limit = false;
1948         int ret;
1949
1950         if (adev->ras_enabled && con)
1951                 data = &con->eh_data;
1952         else
1953                 return 0;
1954
1955         *data = kmalloc(sizeof(**data), GFP_KERNEL | __GFP_ZERO);
1956         if (!*data) {
1957                 ret = -ENOMEM;
1958                 goto out;
1959         }
1960
1961         mutex_init(&con->recovery_lock);
1962         INIT_WORK(&con->recovery_work, amdgpu_ras_do_recovery);
1963         atomic_set(&con->in_recovery, 0);
1964         con->adev = adev;
1965
1966         max_eeprom_records_len = amdgpu_ras_eeprom_get_record_max_length();
1967         amdgpu_ras_validate_threshold(adev, max_eeprom_records_len);
1968
1969         /* Todo: During test the SMU might fail to read the eeprom through I2C
1970          * when the GPU is pending on XGMI reset during probe time
1971          * (Mostly after second bus reset), skip it now
1972          */
1973         if (adev->gmc.xgmi.pending_reset)
1974                 return 0;
1975         ret = amdgpu_ras_eeprom_init(&con->eeprom_control, &exc_err_limit);
1976         /*
1977          * This calling fails when exc_err_limit is true or
1978          * ret != 0.
1979          */
1980         if (exc_err_limit || ret)
1981                 goto free;
1982
1983         if (con->eeprom_control.num_recs) {
1984                 ret = amdgpu_ras_load_bad_pages(adev);
1985                 if (ret)
1986                         goto free;
1987
1988                 if (adev->smu.ppt_funcs && adev->smu.ppt_funcs->send_hbm_bad_pages_num)
1989                         adev->smu.ppt_funcs->send_hbm_bad_pages_num(&adev->smu, con->eeprom_control.num_recs);
1990         }
1991
1992         return 0;
1993
1994 free:
1995         kfree((*data)->bps);
1996         kfree(*data);
1997         con->eh_data = NULL;
1998 out:
1999         dev_warn(adev->dev, "Failed to initialize ras recovery!\n");
2000
2001         /*
2002          * Except error threshold exceeding case, other failure cases in this
2003          * function would not fail amdgpu driver init.
2004          */
2005         if (!exc_err_limit)
2006                 ret = 0;
2007         else
2008                 ret = -EINVAL;
2009
2010         return ret;
2011 }
2012
2013 static int amdgpu_ras_recovery_fini(struct amdgpu_device *adev)
2014 {
2015         struct amdgpu_ras *con = amdgpu_ras_get_context(adev);
2016         struct ras_err_handler_data *data = con->eh_data;
2017
2018         /* recovery_init failed to init it, fini is useless */
2019         if (!data)
2020                 return 0;
2021
2022         cancel_work_sync(&con->recovery_work);
2023
2024         mutex_lock(&con->recovery_lock);
2025         con->eh_data = NULL;
2026         kfree(data->bps);
2027         kfree(data);
2028         mutex_unlock(&con->recovery_lock);
2029
2030         return 0;
2031 }
2032 /* recovery end */
2033
2034 /* return 0 if ras will reset gpu and repost.*/
2035 int amdgpu_ras_request_reset_on_boot(struct amdgpu_device *adev,
2036                 unsigned int block)
2037 {
2038         struct amdgpu_ras *ras = amdgpu_ras_get_context(adev);
2039
2040         if (!ras)
2041                 return -EINVAL;
2042
2043         ras->flags |= AMDGPU_RAS_FLAG_INIT_NEED_RESET;
2044         return 0;
2045 }
2046
2047 static bool amdgpu_ras_asic_supported(struct amdgpu_device *adev)
2048 {
2049         return adev->asic_type == CHIP_VEGA10 ||
2050                 adev->asic_type == CHIP_VEGA20 ||
2051                 adev->asic_type == CHIP_ARCTURUS ||
2052                 adev->asic_type == CHIP_ALDEBARAN ||
2053                 adev->asic_type == CHIP_SIENNA_CICHLID;
2054 }
2055
2056 /*
2057  * this is workaround for vega20 workstation sku,
2058  * force enable gfx ras, ignore vbios gfx ras flag
2059  * due to GC EDC can not write
2060  */
2061 static void amdgpu_ras_get_quirks(struct amdgpu_device *adev)
2062 {
2063         struct atom_context *ctx = adev->mode_info.atom_context;
2064
2065         if (!ctx)
2066                 return;
2067
2068         if (strnstr(ctx->vbios_version, "D16406",
2069                     sizeof(ctx->vbios_version)) ||
2070                 strnstr(ctx->vbios_version, "D36002",
2071                         sizeof(ctx->vbios_version)))
2072                 adev->ras_hw_enabled |= (1 << AMDGPU_RAS_BLOCK__GFX);
2073 }
2074
2075 /*
2076  * check hardware's ras ability which will be saved in hw_supported.
2077  * if hardware does not support ras, we can skip some ras initializtion and
2078  * forbid some ras operations from IP.
2079  * if software itself, say boot parameter, limit the ras ability. We still
2080  * need allow IP do some limited operations, like disable. In such case,
2081  * we have to initialize ras as normal. but need check if operation is
2082  * allowed or not in each function.
2083  */
2084 static void amdgpu_ras_check_supported(struct amdgpu_device *adev)
2085 {
2086         adev->ras_hw_enabled = adev->ras_enabled = 0;
2087
2088         if (amdgpu_sriov_vf(adev) || !adev->is_atom_fw ||
2089             !amdgpu_ras_asic_supported(adev))
2090                 return;
2091
2092         if (!adev->gmc.xgmi.connected_to_cpu) {
2093                 if (amdgpu_atomfirmware_mem_ecc_supported(adev)) {
2094                         dev_info(adev->dev, "MEM ECC is active.\n");
2095                         adev->ras_hw_enabled |= (1 << AMDGPU_RAS_BLOCK__UMC |
2096                                                    1 << AMDGPU_RAS_BLOCK__DF);
2097                 } else {
2098                         dev_info(adev->dev, "MEM ECC is not presented.\n");
2099                 }
2100
2101                 if (amdgpu_atomfirmware_sram_ecc_supported(adev)) {
2102                         dev_info(adev->dev, "SRAM ECC is active.\n");
2103                         adev->ras_hw_enabled |= ~(1 << AMDGPU_RAS_BLOCK__UMC |
2104                                                     1 << AMDGPU_RAS_BLOCK__DF);
2105                 } else {
2106                         dev_info(adev->dev, "SRAM ECC is not presented.\n");
2107                 }
2108         } else {
2109                 /* driver only manages a few IP blocks RAS feature
2110                  * when GPU is connected cpu through XGMI */
2111                 adev->ras_hw_enabled |= (1 << AMDGPU_RAS_BLOCK__GFX |
2112                                            1 << AMDGPU_RAS_BLOCK__SDMA |
2113                                            1 << AMDGPU_RAS_BLOCK__MMHUB);
2114         }
2115
2116         amdgpu_ras_get_quirks(adev);
2117
2118         /* hw_supported needs to be aligned with RAS block mask. */
2119         adev->ras_hw_enabled &= AMDGPU_RAS_BLOCK_MASK;
2120
2121         adev->ras_enabled = amdgpu_ras_enable == 0 ? 0 :
2122                 adev->ras_hw_enabled & amdgpu_ras_mask;
2123 }
2124
2125 static void amdgpu_ras_counte_dw(struct work_struct *work)
2126 {
2127         struct amdgpu_ras *con = container_of(work, struct amdgpu_ras,
2128                                               ras_counte_delay_work.work);
2129         struct amdgpu_device *adev = con->adev;
2130         struct drm_device *dev = adev_to_drm(adev);
2131         unsigned long ce_count, ue_count;
2132         int res;
2133
2134         res = pm_runtime_get_sync(dev->dev);
2135         if (res < 0)
2136                 goto Out;
2137
2138         /* Cache new values.
2139          */
2140         amdgpu_ras_query_error_count(adev, &ce_count, &ue_count);
2141         atomic_set(&con->ras_ce_count, ce_count);
2142         atomic_set(&con->ras_ue_count, ue_count);
2143
2144         pm_runtime_mark_last_busy(dev->dev);
2145 Out:
2146         pm_runtime_put_autosuspend(dev->dev);
2147 }
2148
2149 int amdgpu_ras_init(struct amdgpu_device *adev)
2150 {
2151         struct amdgpu_ras *con = amdgpu_ras_get_context(adev);
2152         int r;
2153
2154         if (con)
2155                 return 0;
2156
2157         con = kmalloc(sizeof(struct amdgpu_ras) +
2158                         sizeof(struct ras_manager) * AMDGPU_RAS_BLOCK_COUNT,
2159                         GFP_KERNEL|__GFP_ZERO);
2160         if (!con)
2161                 return -ENOMEM;
2162
2163         con->adev = adev;
2164         INIT_DELAYED_WORK(&con->ras_counte_delay_work, amdgpu_ras_counte_dw);
2165         atomic_set(&con->ras_ce_count, 0);
2166         atomic_set(&con->ras_ue_count, 0);
2167
2168         con->objs = (struct ras_manager *)(con + 1);
2169
2170         amdgpu_ras_set_context(adev, con);
2171
2172         amdgpu_ras_check_supported(adev);
2173
2174         if (!adev->ras_enabled || adev->asic_type == CHIP_VEGA10) {
2175                 /* set gfx block ras context feature for VEGA20 Gaming
2176                  * send ras disable cmd to ras ta during ras late init.
2177                  */
2178                 if (!adev->ras_enabled && adev->asic_type == CHIP_VEGA20) {
2179                         con->features |= BIT(AMDGPU_RAS_BLOCK__GFX);
2180
2181                         return 0;
2182                 }
2183
2184                 r = 0;
2185                 goto release_con;
2186         }
2187
2188         con->features = 0;
2189         INIT_LIST_HEAD(&con->head);
2190         /* Might need get this flag from vbios. */
2191         con->flags = RAS_DEFAULT_FLAGS;
2192
2193         /* initialize nbio ras function ahead of any other
2194          * ras functions so hardware fatal error interrupt
2195          * can be enabled as early as possible */
2196         switch (adev->asic_type) {
2197         case CHIP_VEGA20:
2198         case CHIP_ARCTURUS:
2199         case CHIP_ALDEBARAN:
2200                 if (!adev->gmc.xgmi.connected_to_cpu)
2201                         adev->nbio.ras_funcs = &nbio_v7_4_ras_funcs;
2202                 break;
2203         default:
2204                 /* nbio ras is not available */
2205                 break;
2206         }
2207
2208         if (adev->nbio.ras_funcs &&
2209             adev->nbio.ras_funcs->init_ras_controller_interrupt) {
2210                 r = adev->nbio.ras_funcs->init_ras_controller_interrupt(adev);
2211                 if (r)
2212                         goto release_con;
2213         }
2214
2215         if (adev->nbio.ras_funcs &&
2216             adev->nbio.ras_funcs->init_ras_err_event_athub_interrupt) {
2217                 r = adev->nbio.ras_funcs->init_ras_err_event_athub_interrupt(adev);
2218                 if (r)
2219                         goto release_con;
2220         }
2221
2222         if (amdgpu_ras_fs_init(adev)) {
2223                 r = -EINVAL;
2224                 goto release_con;
2225         }
2226
2227         dev_info(adev->dev, "RAS INFO: ras initialized successfully, "
2228                  "hardware ability[%x] ras_mask[%x]\n",
2229                  adev->ras_hw_enabled, adev->ras_enabled);
2230
2231         return 0;
2232 release_con:
2233         amdgpu_ras_set_context(adev, NULL);
2234         kfree(con);
2235
2236         return r;
2237 }
2238
2239 int amdgpu_persistent_edc_harvesting_supported(struct amdgpu_device *adev)
2240 {
2241         if (adev->gmc.xgmi.connected_to_cpu)
2242                 return 1;
2243         return 0;
2244 }
2245
2246 static int amdgpu_persistent_edc_harvesting(struct amdgpu_device *adev,
2247                                         struct ras_common_if *ras_block)
2248 {
2249         struct ras_query_if info = {
2250                 .head = *ras_block,
2251         };
2252
2253         if (!amdgpu_persistent_edc_harvesting_supported(adev))
2254                 return 0;
2255
2256         if (amdgpu_ras_query_error_status(adev, &info) != 0)
2257                 DRM_WARN("RAS init harvest failure");
2258
2259         if (amdgpu_ras_reset_error_status(adev, ras_block->block) != 0)
2260                 DRM_WARN("RAS init harvest reset failure");
2261
2262         return 0;
2263 }
2264
2265 /* helper function to handle common stuff in ip late init phase */
2266 int amdgpu_ras_late_init(struct amdgpu_device *adev,
2267                          struct ras_common_if *ras_block,
2268                          struct ras_fs_if *fs_info,
2269                          struct ras_ih_if *ih_info)
2270 {
2271         struct amdgpu_ras *con = amdgpu_ras_get_context(adev);
2272         unsigned long ue_count, ce_count;
2273         int r;
2274
2275         /* disable RAS feature per IP block if it is not supported */
2276         if (!amdgpu_ras_is_supported(adev, ras_block->block)) {
2277                 amdgpu_ras_feature_enable_on_boot(adev, ras_block, 0);
2278                 return 0;
2279         }
2280
2281         r = amdgpu_ras_feature_enable_on_boot(adev, ras_block, 1);
2282         if (r) {
2283                 if (r == -EAGAIN) {
2284                         /* request gpu reset. will run again */
2285                         amdgpu_ras_request_reset_on_boot(adev,
2286                                         ras_block->block);
2287                         return 0;
2288                 } else if (adev->in_suspend || amdgpu_in_reset(adev)) {
2289                         /* in resume phase, if fail to enable ras,
2290                          * clean up all ras fs nodes, and disable ras */
2291                         goto cleanup;
2292                 } else
2293                         return r;
2294         }
2295
2296         /* check for errors on warm reset edc persisant supported ASIC */
2297         amdgpu_persistent_edc_harvesting(adev, ras_block);
2298
2299         /* in resume phase, no need to create ras fs node */
2300         if (adev->in_suspend || amdgpu_in_reset(adev))
2301                 return 0;
2302
2303         if (ih_info->cb) {
2304                 r = amdgpu_ras_interrupt_add_handler(adev, ih_info);
2305                 if (r)
2306                         goto interrupt;
2307         }
2308
2309         r = amdgpu_ras_sysfs_create(adev, fs_info);
2310         if (r)
2311                 goto sysfs;
2312
2313         /* Those are the cached values at init.
2314          */
2315         amdgpu_ras_query_error_count(adev, &ce_count, &ue_count);
2316         atomic_set(&con->ras_ce_count, ce_count);
2317         atomic_set(&con->ras_ue_count, ue_count);
2318
2319         return 0;
2320 cleanup:
2321         amdgpu_ras_sysfs_remove(adev, ras_block);
2322 sysfs:
2323         if (ih_info->cb)
2324                 amdgpu_ras_interrupt_remove_handler(adev, ih_info);
2325 interrupt:
2326         amdgpu_ras_feature_enable(adev, ras_block, 0);
2327         return r;
2328 }
2329
2330 /* helper function to remove ras fs node and interrupt handler */
2331 void amdgpu_ras_late_fini(struct amdgpu_device *adev,
2332                           struct ras_common_if *ras_block,
2333                           struct ras_ih_if *ih_info)
2334 {
2335         if (!ras_block || !ih_info)
2336                 return;
2337
2338         amdgpu_ras_sysfs_remove(adev, ras_block);
2339         if (ih_info->cb)
2340                 amdgpu_ras_interrupt_remove_handler(adev, ih_info);
2341         amdgpu_ras_feature_enable(adev, ras_block, 0);
2342 }
2343
2344 /* do some init work after IP late init as dependence.
2345  * and it runs in resume/gpu reset/booting up cases.
2346  */
2347 void amdgpu_ras_resume(struct amdgpu_device *adev)
2348 {
2349         struct amdgpu_ras *con = amdgpu_ras_get_context(adev);
2350         struct ras_manager *obj, *tmp;
2351
2352         if (!adev->ras_enabled || !con) {
2353                 /* clean ras context for VEGA20 Gaming after send ras disable cmd */
2354                 amdgpu_release_ras_context(adev);
2355
2356                 return;
2357         }
2358
2359         if (con->flags & AMDGPU_RAS_FLAG_INIT_BY_VBIOS) {
2360                 /* Set up all other IPs which are not implemented. There is a
2361                  * tricky thing that IP's actual ras error type should be
2362                  * MULTI_UNCORRECTABLE, but as driver does not handle it, so
2363                  * ERROR_NONE make sense anyway.
2364                  */
2365                 amdgpu_ras_enable_all_features(adev, 1);
2366
2367                 /* We enable ras on all hw_supported block, but as boot
2368                  * parameter might disable some of them and one or more IP has
2369                  * not implemented yet. So we disable them on behalf.
2370                  */
2371                 list_for_each_entry_safe(obj, tmp, &con->head, node) {
2372                         if (!amdgpu_ras_is_supported(adev, obj->head.block)) {
2373                                 amdgpu_ras_feature_enable(adev, &obj->head, 0);
2374                                 /* there should be no any reference. */
2375                                 WARN_ON(alive_obj(obj));
2376                         }
2377                 }
2378         }
2379
2380         if (con->flags & AMDGPU_RAS_FLAG_INIT_NEED_RESET) {
2381                 con->flags &= ~AMDGPU_RAS_FLAG_INIT_NEED_RESET;
2382                 /* setup ras obj state as disabled.
2383                  * for init_by_vbios case.
2384                  * if we want to enable ras, just enable it in a normal way.
2385                  * If we want do disable it, need setup ras obj as enabled,
2386                  * then issue another TA disable cmd.
2387                  * See feature_enable_on_boot
2388                  */
2389                 amdgpu_ras_disable_all_features(adev, 1);
2390                 amdgpu_ras_reset_gpu(adev);
2391         }
2392 }
2393
2394 void amdgpu_ras_suspend(struct amdgpu_device *adev)
2395 {
2396         struct amdgpu_ras *con = amdgpu_ras_get_context(adev);
2397
2398         if (!adev->ras_enabled || !con)
2399                 return;
2400
2401         amdgpu_ras_disable_all_features(adev, 0);
2402         /* Make sure all ras objects are disabled. */
2403         if (con->features)
2404                 amdgpu_ras_disable_all_features(adev, 1);
2405 }
2406
2407 /* do some fini work before IP fini as dependence */
2408 int amdgpu_ras_pre_fini(struct amdgpu_device *adev)
2409 {
2410         struct amdgpu_ras *con = amdgpu_ras_get_context(adev);
2411
2412         if (!adev->ras_enabled || !con)
2413                 return 0;
2414
2415
2416         /* Need disable ras on all IPs here before ip [hw/sw]fini */
2417         amdgpu_ras_disable_all_features(adev, 0);
2418         amdgpu_ras_recovery_fini(adev);
2419         return 0;
2420 }
2421
2422 int amdgpu_ras_fini(struct amdgpu_device *adev)
2423 {
2424         struct amdgpu_ras *con = amdgpu_ras_get_context(adev);
2425
2426         if (!adev->ras_enabled || !con)
2427                 return 0;
2428
2429         amdgpu_ras_fs_fini(adev);
2430         amdgpu_ras_interrupt_remove_all(adev);
2431
2432         WARN(con->features, "Feature mask is not cleared");
2433
2434         if (con->features)
2435                 amdgpu_ras_disable_all_features(adev, 1);
2436
2437         cancel_delayed_work_sync(&con->ras_counte_delay_work);
2438
2439         amdgpu_ras_set_context(adev, NULL);
2440         kfree(con);
2441
2442         return 0;
2443 }
2444
2445 void amdgpu_ras_global_ras_isr(struct amdgpu_device *adev)
2446 {
2447         amdgpu_ras_check_supported(adev);
2448         if (!adev->ras_hw_enabled)
2449                 return;
2450
2451         if (atomic_cmpxchg(&amdgpu_ras_in_intr, 0, 1) == 0) {
2452                 dev_info(adev->dev, "uncorrectable hardware error"
2453                         "(ERREVENT_ATHUB_INTERRUPT) detected!\n");
2454
2455                 amdgpu_ras_reset_gpu(adev);
2456         }
2457 }
2458
2459 bool amdgpu_ras_need_emergency_restart(struct amdgpu_device *adev)
2460 {
2461         if (adev->asic_type == CHIP_VEGA20 &&
2462             adev->pm.fw_version <= 0x283400) {
2463                 return !(amdgpu_asic_reset_method(adev) == AMD_RESET_METHOD_BACO) &&
2464                                 amdgpu_ras_intr_triggered();
2465         }
2466
2467         return false;
2468 }
2469
2470 void amdgpu_release_ras_context(struct amdgpu_device *adev)
2471 {
2472         struct amdgpu_ras *con = amdgpu_ras_get_context(adev);
2473
2474         if (!con)
2475                 return;
2476
2477         if (!adev->ras_enabled && con->features & BIT(AMDGPU_RAS_BLOCK__GFX)) {
2478                 con->features &= ~BIT(AMDGPU_RAS_BLOCK__GFX);
2479                 amdgpu_ras_set_context(adev, NULL);
2480                 kfree(con);
2481         }
2482 }