drivers/gpu/drm/i915/i915_gpu_error.c

   1 /*
   2  * Copyright (c) 2008 Intel Corporation
   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 (including the next
  12  * paragraph) shall be included in all copies or substantial portions of the
  13  * Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  21  * IN THE SOFTWARE.
  22  *
  23  * Authors:
  24  *    Eric Anholt <[email protected]>
  25  *    Keith Packard <[email protected]>
  26  *    Mika Kuoppala <[email protected]>
  27  *
  28  */
  29
  30 #include <generated/utsrelease.h>
  31 #include <linux/stop_machine.h>
  32 #include <linux/zlib.h>
  33 #include <drm/drm_print.h>
  34 #include <linux/ascii85.h>
  35
  36 #include "i915_gpu_error.h"
  37 #include "i915_drv.h"
  38
  39 static inline const struct intel_engine_cs *
  40 engine_lookup(const struct drm_i915_private *i915, unsigned int id)
  41 {
  42         if (id >= I915_NUM_ENGINES)
  43                 return NULL;
  44
  45         return i915->engine[id];
  46 }
  47
  48 static inline const char *
  49 __engine_name(const struct intel_engine_cs *engine)
  50 {
  51         return engine ? engine->name : "";
  52 }
  53
  54 static const char *
  55 engine_name(const struct drm_i915_private *i915, unsigned int id)
  56 {
  57         return __engine_name(engine_lookup(i915, id));
  58 }
  59
  60 static const char *tiling_flag(int tiling)
  61 {
  62         switch (tiling) {
  63         default:
  64         case I915_TILING_NONE: return "";
  65         case I915_TILING_X: return " X";
  66         case I915_TILING_Y: return " Y";
  67         }
  68 }
  69
  70 static const char *dirty_flag(int dirty)
  71 {
  72         return dirty ? " dirty" : "";
  73 }
  74
  75 static const char *purgeable_flag(int purgeable)
  76 {
  77         return purgeable ? " purgeable" : "";
  78 }
  79
  80 static bool __i915_error_ok(struct drm_i915_error_state_buf *e)
  81 {
  82
  83         if (!e->err && WARN(e->bytes > (e->size - 1), "overflow")) {
  84                 e->err = -ENOSPC;
  85                 return false;
  86         }
  87
  88         if (e->bytes == e->size - 1 || e->err)
  89                 return false;
  90
  91         return true;
  92 }
  93
  94 static bool __i915_error_seek(struct drm_i915_error_state_buf *e,
  95                               unsigned len)
  96 {
  97         if (e->pos + len <= e->start) {
  98                 e->pos += len;
  99                 return false;
 100         }
 101
 102         /* First vsnprintf needs to fit in its entirety for memmove */
 103         if (len >= e->size) {
 104                 e->err = -EIO;
 105                 return false;
 106         }
 107
 108         return true;
 109 }
 110
 111 static void __i915_error_advance(struct drm_i915_error_state_buf *e,
 112                                  unsigned len)
 113 {
 114         /* If this is first printf in this window, adjust it so that
 115          * start position matches start of the buffer
 116          */
 117
 118         if (e->pos < e->start) {
 119                 const size_t off = e->start - e->pos;
 120
 121                 /* Should not happen but be paranoid */
 122                 if (off > len || e->bytes) {
 123                         e->err = -EIO;
 124                         return;
 125                 }
 126
 127                 memmove(e->buf, e->buf + off, len - off);
 128                 e->bytes = len - off;
 129                 e->pos = e->start;
 130                 return;
 131         }
 132
 133         e->bytes += len;
 134         e->pos += len;
 135 }
 136
 137 __printf(2, 0)
 138 static void i915_error_vprintf(struct drm_i915_error_state_buf *e,
 139                                const char *f, va_list args)
 140 {
 141         unsigned len;
 142
 143         if (!__i915_error_ok(e))
 144                 return;
 145
 146         /* Seek the first printf which is hits start position */
 147         if (e->pos < e->start) {
 148                 va_list tmp;
 149
 150                 va_copy(tmp, args);
 151                 len = vsnprintf(NULL, 0, f, tmp);
 152                 va_end(tmp);
 153
 154                 if (!__i915_error_seek(e, len))
 155                         return;
 156         }
 157
 158         len = vsnprintf(e->buf + e->bytes, e->size - e->bytes, f, args);
 159         if (len >= e->size - e->bytes)
 160                 len = e->size - e->bytes - 1;
 161
 162         __i915_error_advance(e, len);
 163 }
 164
 165 static void i915_error_puts(struct drm_i915_error_state_buf *e,
 166                             const char *str)
 167 {
 168         unsigned len;
 169
 170         if (!__i915_error_ok(e))
 171                 return;
 172
 173         len = strlen(str);
 174
 175         /* Seek the first printf which is hits start position */
 176         if (e->pos < e->start) {
 177                 if (!__i915_error_seek(e, len))
 178                         return;
 179         }
 180
 181         if (len >= e->size - e->bytes)
 182                 len = e->size - e->bytes - 1;
 183         memcpy(e->buf + e->bytes, str, len);
 184
 185         __i915_error_advance(e, len);
 186 }
 187
 188 #define err_printf(e, ...) i915_error_printf(e, __VA_ARGS__)
 189 #define err_puts(e, s) i915_error_puts(e, s)
 190
 191 static void __i915_printfn_error(struct drm_printer *p, struct va_format *vaf)
 192 {
 193         i915_error_vprintf(p->arg, vaf->fmt, *vaf->va);
 194 }
 195
 196 static inline struct drm_printer
 197 i915_error_printer(struct drm_i915_error_state_buf *e)
 198 {
 199         struct drm_printer p = {
 200                 .printfn = __i915_printfn_error,
 201                 .arg = e,
 202         };
 203         return p;
 204 }
 205
 206 #ifdef CONFIG_DRM_I915_COMPRESS_ERROR
 207
 208 struct compress {
 209         struct z_stream_s zstream;
 210         void *tmp;
 211 };
 212
 213 static bool compress_init(struct compress *c)
 214 {
 215         struct z_stream_s *zstream = memset(&c->zstream, 0, sizeof(c->zstream));
 216
 217         zstream->workspace =
 218                 kmalloc(zlib_deflate_workspacesize(MAX_WBITS, MAX_MEM_LEVEL),
 219                         GFP_ATOMIC | __GFP_NOWARN);
 220         if (!zstream->workspace)
 221                 return false;
 222
 223         if (zlib_deflateInit(zstream, Z_DEFAULT_COMPRESSION) != Z_OK) {
 224                 kfree(zstream->workspace);
 225                 return false;
 226         }
 227
 228         c->tmp = NULL;
 229         if (i915_has_memcpy_from_wc())
 230                 c->tmp = (void *)__get_free_page(GFP_ATOMIC | __GFP_NOWARN);
 231
 232         return true;
 233 }
 234
 235 static void *compress_next_page(struct drm_i915_error_object *dst)
 236 {
 237         unsigned long page;
 238
 239         if (dst->page_count >= dst->num_pages)
 240                 return ERR_PTR(-ENOSPC);
 241
 242         page = __get_free_page(GFP_ATOMIC | __GFP_NOWARN);
 243         if (!page)
 244                 return ERR_PTR(-ENOMEM);
 245
 246         return dst->pages[dst->page_count++] = (void *)page;
 247 }
 248
 249 static int compress_page(struct compress *c,
 250                          void *src,
 251                          struct drm_i915_error_object *dst)
 252 {
 253         struct z_stream_s *zstream = &c->zstream;
 254
 255         zstream->next_in = src;
 256         if (c->tmp && i915_memcpy_from_wc(c->tmp, src, PAGE_SIZE))
 257                 zstream->next_in = c->tmp;
 258         zstream->avail_in = PAGE_SIZE;
 259
 260         do {
 261                 if (zstream->avail_out == 0) {
 262                         zstream->next_out = compress_next_page(dst);
 263                         if (IS_ERR(zstream->next_out))
 264                                 return PTR_ERR(zstream->next_out);
 265
 266                         zstream->avail_out = PAGE_SIZE;
 267                 }
 268
 269                 if (zlib_deflate(zstream, Z_NO_FLUSH) != Z_OK)
 270                         return -EIO;
 271         } while (zstream->avail_in);
 272
 273         /* Fallback to uncompressed if we increase size? */
 274         if (0 && zstream->total_out > zstream->total_in)
 275                 return -E2BIG;
 276
 277         return 0;
 278 }
 279
 280 static int compress_flush(struct compress *c,
 281                           struct drm_i915_error_object *dst)
 282 {
 283         struct z_stream_s *zstream = &c->zstream;
 284
 285         do {
 286                 switch (zlib_deflate(zstream, Z_FINISH)) {
 287                 case Z_OK: /* more space requested */
 288                         zstream->next_out = compress_next_page(dst);
 289                         if (IS_ERR(zstream->next_out))
 290                                 return PTR_ERR(zstream->next_out);
 291
 292                         zstream->avail_out = PAGE_SIZE;
 293                         break;
 294
 295                 case Z_STREAM_END:
 296                         goto end;
 297
 298                 default: /* any error */
 299                         return -EIO;
 300                 }
 301         } while (1);
 302
 303 end:
 304         memset(zstream->next_out, 0, zstream->avail_out);
 305         dst->unused = zstream->avail_out;
 306         return 0;
 307 }
 308
 309 static void compress_fini(struct compress *c,
 310                           struct drm_i915_error_object *dst)
 311 {
 312         struct z_stream_s *zstream = &c->zstream;
 313
 314         zlib_deflateEnd(zstream);
 315         kfree(zstream->workspace);
 316         if (c->tmp)
 317                 free_page((unsigned long)c->tmp);
 318 }
 319
 320 static void err_compression_marker(struct drm_i915_error_state_buf *m)
 321 {
 322         err_puts(m, ":");
 323 }
 324
 325 #else
 326
 327 struct compress {
 328 };
 329
 330 static bool compress_init(struct compress *c)
 331 {
 332         return true;
 333 }
 334
 335 static int compress_page(struct compress *c,
 336                          void *src,
 337                          struct drm_i915_error_object *dst)
 338 {
 339         unsigned long page;
 340         void *ptr;
 341
 342         page = __get_free_page(GFP_ATOMIC | __GFP_NOWARN);
 343         if (!page)
 344                 return -ENOMEM;
 345
 346         ptr = (void *)page;
 347         if (!i915_memcpy_from_wc(ptr, src, PAGE_SIZE))
 348                 memcpy(ptr, src, PAGE_SIZE);
 349         dst->pages[dst->page_count++] = ptr;
 350
 351         return 0;
 352 }
 353
 354 static int compress_flush(struct compress *c,
 355                           struct drm_i915_error_object *dst)
 356 {
 357         return 0;
 358 }
 359
 360 static void compress_fini(struct compress *c,
 361                           struct drm_i915_error_object *dst)
 362 {
 363 }
 364
 365 static void err_compression_marker(struct drm_i915_error_state_buf *m)
 366 {
 367         err_puts(m, "~");
 368 }
 369
 370 #endif
 371
 372 static void print_error_buffers(struct drm_i915_error_state_buf *m,
 373                                 const char *name,
 374                                 struct drm_i915_error_buffer *err,
 375                                 int count)
 376 {
 377         err_printf(m, "%s [%d]:\n", name, count);
 378
 379         while (count--) {
 380                 err_printf(m, "    %08x_%08x %8u %02x %02x %02x",
 381                            upper_32_bits(err->gtt_offset),
 382                            lower_32_bits(err->gtt_offset),
 383                            err->size,
 384                            err->read_domains,
 385                            err->write_domain,
 386                            err->wseqno);
 387                 err_puts(m, tiling_flag(err->tiling));
 388                 err_puts(m, dirty_flag(err->dirty));
 389                 err_puts(m, purgeable_flag(err->purgeable));
 390                 err_puts(m, err->userptr ? " userptr" : "");
 391                 err_puts(m, err->engine != -1 ? " " : "");
 392                 err_puts(m, engine_name(m->i915, err->engine));
 393                 err_puts(m, i915_cache_level_str(m->i915, err->cache_level));
 394
 395                 if (err->name)
 396                         err_printf(m, " (name: %d)", err->name);
 397                 if (err->fence_reg != I915_FENCE_REG_NONE)
 398                         err_printf(m, " (fence: %d)", err->fence_reg);
 399
 400                 err_puts(m, "\n");
 401                 err++;
 402         }
 403 }
 404
 405 static void error_print_instdone(struct drm_i915_error_state_buf *m,
 406                                  const struct drm_i915_error_engine *ee)
 407 {
 408         int slice;
 409         int subslice;
 410
 411         err_printf(m, "  INSTDONE: 0x%08x\n",
 412                    ee->instdone.instdone);
 413
 414         if (ee->engine_id != RCS || INTEL_GEN(m->i915) <= 3)
 415                 return;
 416
 417         err_printf(m, "  SC_INSTDONE: 0x%08x\n",
 418                    ee->instdone.slice_common);
 419
 420         if (INTEL_GEN(m->i915) <= 6)
 421                 return;
 422
 423         for_each_instdone_slice_subslice(m->i915, slice, subslice)
 424                 err_printf(m, "  SAMPLER_INSTDONE[%d][%d]: 0x%08x\n",
 425                            slice, subslice,
 426                            ee->instdone.sampler[slice][subslice]);
 427
 428         for_each_instdone_slice_subslice(m->i915, slice, subslice)
 429                 err_printf(m, "  ROW_INSTDONE[%d][%d]: 0x%08x\n",
 430                            slice, subslice,
 431                            ee->instdone.row[slice][subslice]);
 432 }
 433
 434 static const char *bannable(const struct drm_i915_error_context *ctx)
 435 {
 436         return ctx->bannable ? "" : " (unbannable)";
 437 }
 438
 439 static void error_print_request(struct drm_i915_error_state_buf *m,
 440                                 const char *prefix,
 441                                 const struct drm_i915_error_request *erq,
 442                                 const unsigned long epoch)
 443 {
 444         if (!erq->seqno)
 445                 return;
 446
 447         err_printf(m, "%s pid %d, ban score %d, seqno %8x:%08x, prio %d, emitted %dms, start %08x, head %08x, tail %08x\n",
 448                    prefix, erq->pid, erq->ban_score,
 449                    erq->context, erq->seqno, erq->sched_attr.priority,
 450                    jiffies_to_msecs(erq->jiffies - epoch),
 451                    erq->start, erq->head, erq->tail);
 452 }
 453
 454 static void error_print_context(struct drm_i915_error_state_buf *m,
 455                                 const char *header,
 456                                 const struct drm_i915_error_context *ctx)
 457 {
 458         err_printf(m, "%s%s[%d] user_handle %d hw_id %d, prio %d, ban score %d%s guilty %d active %d\n",
 459                    header, ctx->comm, ctx->pid, ctx->handle, ctx->hw_id,
 460                    ctx->sched_attr.priority, ctx->ban_score, bannable(ctx),
 461                    ctx->guilty, ctx->active);
 462 }
 463
 464 static void error_print_engine(struct drm_i915_error_state_buf *m,
 465                                const struct drm_i915_error_engine *ee,
 466                                const unsigned long epoch)
 467 {
 468         int n;
 469
 470         err_printf(m, "%s command stream:\n",
 471                    engine_name(m->i915, ee->engine_id));
 472         err_printf(m, "  IDLE?: %s\n", yesno(ee->idle));
 473         err_printf(m, "  START: 0x%08x\n", ee->start);
 474         err_printf(m, "  HEAD:  0x%08x [0x%08x]\n", ee->head, ee->rq_head);
 475         err_printf(m, "  TAIL:  0x%08x [0x%08x, 0x%08x]\n",
 476                    ee->tail, ee->rq_post, ee->rq_tail);
 477         err_printf(m, "  CTL:   0x%08x\n", ee->ctl);
 478         err_printf(m, "  MODE:  0x%08x\n", ee->mode);
 479         err_printf(m, "  HWS:   0x%08x\n", ee->hws);
 480         err_printf(m, "  ACTHD: 0x%08x %08x\n",
 481                    (u32)(ee->acthd>>32), (u32)ee->acthd);
 482         err_printf(m, "  IPEIR: 0x%08x\n", ee->ipeir);
 483         err_printf(m, "  IPEHR: 0x%08x\n", ee->ipehr);
 484
 485         error_print_instdone(m, ee);
 486
 487         if (ee->batchbuffer) {
 488                 u64 start = ee->batchbuffer->gtt_offset;
 489                 u64 end = start + ee->batchbuffer->gtt_size;
 490
 491                 err_printf(m, "  batch: [0x%08x_%08x, 0x%08x_%08x]\n",
 492                            upper_32_bits(start), lower_32_bits(start),
 493                            upper_32_bits(end), lower_32_bits(end));
 494         }
 495         if (INTEL_GEN(m->i915) >= 4) {
 496                 err_printf(m, "  BBADDR: 0x%08x_%08x\n",
 497                            (u32)(ee->bbaddr>>32), (u32)ee->bbaddr);
 498                 err_printf(m, "  BB_STATE: 0x%08x\n", ee->bbstate);
 499                 err_printf(m, "  INSTPS: 0x%08x\n", ee->instps);
 500         }
 501         err_printf(m, "  INSTPM: 0x%08x\n", ee->instpm);
 502         err_printf(m, "  FADDR: 0x%08x %08x\n", upper_32_bits(ee->faddr),
 503                    lower_32_bits(ee->faddr));
 504         if (INTEL_GEN(m->i915) >= 6) {
 505                 err_printf(m, "  RC PSMI: 0x%08x\n", ee->rc_psmi);
 506                 err_printf(m, "  FAULT_REG: 0x%08x\n", ee->fault_reg);
 507                 err_printf(m, "  SYNC_0: 0x%08x\n",
 508                            ee->semaphore_mboxes[0]);
 509                 err_printf(m, "  SYNC_1: 0x%08x\n",
 510                            ee->semaphore_mboxes[1]);
 511                 if (HAS_VEBOX(m->i915))
 512                         err_printf(m, "  SYNC_2: 0x%08x\n",
 513                                    ee->semaphore_mboxes[2]);
 514         }
 515         if (USES_PPGTT(m->i915)) {
 516                 err_printf(m, "  GFX_MODE: 0x%08x\n", ee->vm_info.gfx_mode);
 517
 518                 if (INTEL_GEN(m->i915) >= 8) {
 519                         int i;
 520                         for (i = 0; i < 4; i++)
 521                                 err_printf(m, "  PDP%d: 0x%016llx\n",
 522                                            i, ee->vm_info.pdp[i]);
 523                 } else {
 524                         err_printf(m, "  PP_DIR_BASE: 0x%08x\n",
 525                                    ee->vm_info.pp_dir_base);
 526                 }
 527         }
 528         err_printf(m, "  seqno: 0x%08x\n", ee->seqno);
 529         err_printf(m, "  last_seqno: 0x%08x\n", ee->last_seqno);
 530         err_printf(m, "  waiting: %s\n", yesno(ee->waiting));
 531         err_printf(m, "  ring->head: 0x%08x\n", ee->cpu_ring_head);
 532         err_printf(m, "  ring->tail: 0x%08x\n", ee->cpu_ring_tail);
 533         err_printf(m, "  hangcheck stall: %s\n", yesno(ee->hangcheck_stalled));
 534         err_printf(m, "  hangcheck action: %s\n",
 535                    hangcheck_action_to_str(ee->hangcheck_action));
 536         err_printf(m, "  hangcheck action timestamp: %dms (%lu%s)\n",
 537                    jiffies_to_msecs(ee->hangcheck_timestamp - epoch),
 538                    ee->hangcheck_timestamp,
 539                    ee->hangcheck_timestamp == epoch ? "; epoch" : "");
 540         err_printf(m, "  engine reset count: %u\n", ee->reset_count);
 541
 542         for (n = 0; n < ee->num_ports; n++) {
 543                 err_printf(m, "  ELSP[%d]:", n);
 544                 error_print_request(m, " ", &ee->execlist[n], epoch);
 545         }
 546
 547         error_print_context(m, "  Active context: ", &ee->context);
 548 }
 549
 550 void i915_error_printf(struct drm_i915_error_state_buf *e, const char *f, ...)
 551 {
 552         va_list args;
 553
 554         va_start(args, f);
 555         i915_error_vprintf(e, f, args);
 556         va_end(args);
 557 }
 558
 559 static void print_error_obj(struct drm_i915_error_state_buf *m,
 560                             struct intel_engine_cs *engine,
 561                             const char *name,
 562                             struct drm_i915_error_object *obj)
 563 {
 564         char out[ASCII85_BUFSZ];
 565         int page;
 566
 567         if (!obj)
 568                 return;
 569
 570         if (name) {
 571                 err_printf(m, "%s --- %s = 0x%08x %08x\n",
 572                            engine ? engine->name : "global", name,
 573                            upper_32_bits(obj->gtt_offset),
 574                            lower_32_bits(obj->gtt_offset));
 575         }
 576
 577         err_compression_marker(m);
 578         for (page = 0; page < obj->page_count; page++) {
 579                 int i, len;
 580
 581                 len = PAGE_SIZE;
 582                 if (page == obj->page_count - 1)
 583                         len -= obj->unused;
 584                 len = ascii85_encode_len(len);
 585
 586                 for (i = 0; i < len; i++)
 587                         err_puts(m, ascii85_encode(obj->pages[page][i], out));
 588         }
 589         err_puts(m, "\n");
 590 }
 591
 592 static void err_print_capabilities(struct drm_i915_error_state_buf *m,
 593                                    const struct intel_device_info *info,
 594                                    const struct intel_driver_caps *caps)
 595 {
 596         struct drm_printer p = i915_error_printer(m);
 597
 598         intel_device_info_dump_flags(info, &p);
 599         intel_driver_caps_print(caps, &p);
 600         intel_device_info_dump_topology(&info->sseu, &p);
 601 }
 602
 603 static void err_print_params(struct drm_i915_error_state_buf *m,
 604                              const struct i915_params *params)
 605 {
 606         struct drm_printer p = i915_error_printer(m);
 607
 608         i915_params_dump(params, &p);
 609 }
 610
 611 static void err_print_pciid(struct drm_i915_error_state_buf *m,
 612                             struct drm_i915_private *i915)
 613 {
 614         struct pci_dev *pdev = i915->drm.pdev;
 615
 616         err_printf(m, "PCI ID: 0x%04x\n", pdev->device);
 617         err_printf(m, "PCI Revision: 0x%02x\n", pdev->revision);
 618         err_printf(m, "PCI Subsystem: %04x:%04x\n",
 619                    pdev->subsystem_vendor,
 620                    pdev->subsystem_device);
 621 }
 622
 623 static void err_print_uc(struct drm_i915_error_state_buf *m,
 624                          const struct i915_error_uc *error_uc)
 625 {
 626         struct drm_printer p = i915_error_printer(m);
 627         const struct i915_gpu_state *error =
 628                 container_of(error_uc, typeof(*error), uc);
 629
 630         if (!error->device_info.has_guc)
 631                 return;
 632
 633         intel_uc_fw_dump(&error_uc->guc_fw, &p);
 634         intel_uc_fw_dump(&error_uc->huc_fw, &p);
 635         print_error_obj(m, NULL, "GuC log buffer", error_uc->guc_log);
 636 }
 637
 638 int i915_error_state_to_str(struct drm_i915_error_state_buf *m,
 639                             const struct i915_gpu_state *error)
 640 {
 641         struct drm_i915_private *dev_priv = m->i915;
 642         struct drm_i915_error_object *obj;
 643         struct timespec64 ts;
 644         int i, j;
 645
 646         if (!error) {
 647                 err_printf(m, "No error state collected\n");
 648                 return 0;
 649         }
 650
 651         if (IS_ERR(error))
 652                 return PTR_ERR(error);
 653
 654         if (*error->error_msg)
 655                 err_printf(m, "%s\n", error->error_msg);
 656         err_printf(m, "Kernel: " UTS_RELEASE "\n");
 657         ts = ktime_to_timespec64(error->time);
 658         err_printf(m, "Time: %lld s %ld us\n",
 659                    (s64)ts.tv_sec, ts.tv_nsec / NSEC_PER_USEC);
 660         ts = ktime_to_timespec64(error->boottime);
 661         err_printf(m, "Boottime: %lld s %ld us\n",
 662                    (s64)ts.tv_sec, ts.tv_nsec / NSEC_PER_USEC);
 663         ts = ktime_to_timespec64(error->uptime);
 664         err_printf(m, "Uptime: %lld s %ld us\n",
 665                    (s64)ts.tv_sec, ts.tv_nsec / NSEC_PER_USEC);
 666         err_printf(m, "Epoch: %lu jiffies (%u HZ)\n", error->epoch, HZ);
 667         err_printf(m, "Capture: %lu jiffies; %d ms ago, %d ms after epoch\n",
 668                    error->capture,
 669                    jiffies_to_msecs(jiffies - error->capture),
 670                    jiffies_to_msecs(error->capture - error->epoch));
 671
 672         for (i = 0; i < ARRAY_SIZE(error->engine); i++) {
 673                 if (error->engine[i].hangcheck_stalled &&
 674                     error->engine[i].context.pid) {
 675                         err_printf(m, "Active process (on ring %s): %s [%d], score %d%s\n",
 676                                    engine_name(m->i915, i),
 677                                    error->engine[i].context.comm,
 678                                    error->engine[i].context.pid,
 679                                    error->engine[i].context.ban_score,
 680                                    bannable(&error->engine[i].context));
 681                 }
 682         }
 683         err_printf(m, "Reset count: %u\n", error->reset_count);
 684         err_printf(m, "Suspend count: %u\n", error->suspend_count);
 685         err_printf(m, "Platform: %s\n", intel_platform_name(error->device_info.platform));
 686         err_print_pciid(m, error->i915);
 687
 688         err_printf(m, "IOMMU enabled?: %d\n", error->iommu);
 689
 690         if (HAS_CSR(dev_priv)) {
 691                 struct intel_csr *csr = &dev_priv->csr;
 692
 693                 err_printf(m, "DMC loaded: %s\n",
 694                            yesno(csr->dmc_payload != NULL));
 695                 err_printf(m, "DMC fw version: %d.%d\n",
 696                            CSR_VERSION_MAJOR(csr->version),
 697                            CSR_VERSION_MINOR(csr->version));
 698         }
 699
 700         err_printf(m, "GT awake: %s\n", yesno(error->awake));
 701         err_printf(m, "RPM wakelock: %s\n", yesno(error->wakelock));
 702         err_printf(m, "PM suspended: %s\n", yesno(error->suspended));
 703         err_printf(m, "EIR: 0x%08x\n", error->eir);
 704         err_printf(m, "IER: 0x%08x\n", error->ier);
 705         for (i = 0; i < error->ngtier; i++)
 706                 err_printf(m, "GTIER[%d]: 0x%08x\n", i, error->gtier[i]);
 707         err_printf(m, "PGTBL_ER: 0x%08x\n", error->pgtbl_er);
 708         err_printf(m, "FORCEWAKE: 0x%08x\n", error->forcewake);
 709         err_printf(m, "DERRMR: 0x%08x\n", error->derrmr);
 710         err_printf(m, "CCID: 0x%08x\n", error->ccid);
 711         err_printf(m, "Missed interrupts: 0x%08lx\n", dev_priv->gpu_error.missed_irq_rings);
 712
 713         for (i = 0; i < error->nfence; i++)
 714                 err_printf(m, "  fence[%d] = %08llx\n", i, error->fence[i]);
 715
 716         if (INTEL_GEN(dev_priv) >= 6) {
 717                 err_printf(m, "ERROR: 0x%08x\n", error->error);
 718
 719                 if (INTEL_GEN(dev_priv) >= 8)
 720                         err_printf(m, "FAULT_TLB_DATA: 0x%08x 0x%08x\n",
 721                                    error->fault_data1, error->fault_data0);
 722
 723                 err_printf(m, "DONE_REG: 0x%08x\n", error->done_reg);
 724         }
 725
 726         if (IS_GEN7(dev_priv))
 727                 err_printf(m, "ERR_INT: 0x%08x\n", error->err_int);
 728
 729         for (i = 0; i < ARRAY_SIZE(error->engine); i++) {
 730                 if (error->engine[i].engine_id != -1)
 731                         error_print_engine(m, &error->engine[i], error->epoch);
 732         }
 733
 734         for (i = 0; i < ARRAY_SIZE(error->active_vm); i++) {
 735                 char buf[128];
 736                 int len, first = 1;
 737
 738                 if (!error->active_vm[i])
 739                         break;
 740
 741                 len = scnprintf(buf, sizeof(buf), "Active (");
 742                 for (j = 0; j < ARRAY_SIZE(error->engine); j++) {
 743                         if (error->engine[j].vm != error->active_vm[i])
 744                                 continue;
 745
 746                         len += scnprintf(buf + len, sizeof(buf), "%s%s",
 747                                          first ? "" : ", ",
 748                                          dev_priv->engine[j]->name);
 749                         first = 0;
 750                 }
 751                 scnprintf(buf + len, sizeof(buf), ")");
 752                 print_error_buffers(m, buf,
 753                                     error->active_bo[i],
 754                                     error->active_bo_count[i]);
 755         }
 756
 757         print_error_buffers(m, "Pinned (global)",
 758                             error->pinned_bo,
 759                             error->pinned_bo_count);
 760
 761         for (i = 0; i < ARRAY_SIZE(error->engine); i++) {
 762                 const struct drm_i915_error_engine *ee = &error->engine[i];
 763
 764                 obj = ee->batchbuffer;
 765                 if (obj) {
 766                         err_puts(m, dev_priv->engine[i]->name);
 767                         if (ee->context.pid)
 768                                 err_printf(m, " (submitted by %s [%d], ctx %d [%d], score %d%s)",
 769                                            ee->context.comm,
 770                                            ee->context.pid,
 771                                            ee->context.handle,
 772                                            ee->context.hw_id,
 773                                            ee->context.ban_score,
 774                                            bannable(&ee->context));
 775                         err_printf(m, " --- gtt_offset = 0x%08x %08x\n",
 776                                    upper_32_bits(obj->gtt_offset),
 777                                    lower_32_bits(obj->gtt_offset));
 778                         print_error_obj(m, dev_priv->engine[i], NULL, obj);
 779                 }
 780
 781                 for (j = 0; j < ee->user_bo_count; j++)
 782                         print_error_obj(m, dev_priv->engine[i],
 783                                         "user", ee->user_bo[j]);
 784
 785                 if (ee->num_requests) {
 786                         err_printf(m, "%s --- %d requests\n",
 787                                    dev_priv->engine[i]->name,
 788                                    ee->num_requests);
 789                         for (j = 0; j < ee->num_requests; j++)
 790                                 error_print_request(m, " ",
 791                                                     &ee->requests[j],
 792                                                     error->epoch);
 793                 }
 794
 795                 if (IS_ERR(ee->waiters)) {
 796                         err_printf(m, "%s --- ? waiters [unable to acquire spinlock]\n",
 797                                    dev_priv->engine[i]->name);
 798                 } else if (ee->num_waiters) {
 799                         err_printf(m, "%s --- %d waiters\n",
 800                                    dev_priv->engine[i]->name,
 801                                    ee->num_waiters);
 802                         for (j = 0; j < ee->num_waiters; j++) {
 803                                 err_printf(m, " seqno 0x%08x for %s [%d]\n",
 804                                            ee->waiters[j].seqno,
 805                                            ee->waiters[j].comm,
 806                                            ee->waiters[j].pid);
 807                         }
 808                 }
 809
 810                 print_error_obj(m, dev_priv->engine[i],
 811                                 "ringbuffer", ee->ringbuffer);
 812
 813                 print_error_obj(m, dev_priv->engine[i],
 814                                 "HW Status", ee->hws_page);
 815
 816                 print_error_obj(m, dev_priv->engine[i],
 817                                 "HW context", ee->ctx);
 818
 819                 print_error_obj(m, dev_priv->engine[i],
 820                                 "WA context", ee->wa_ctx);
 821
 822                 print_error_obj(m, dev_priv->engine[i],
 823                                 "WA batchbuffer", ee->wa_batchbuffer);
 824
 825                 print_error_obj(m, dev_priv->engine[i],
 826                                 "NULL context", ee->default_state);
 827         }
 828
 829         if (error->overlay)
 830                 intel_overlay_print_error_state(m, error->overlay);
 831
 832         if (error->display)
 833                 intel_display_print_error_state(m, error->display);
 834
 835         err_print_capabilities(m, &error->device_info, &error->driver_caps);
 836         err_print_params(m, &error->params);
 837         err_print_uc(m, &error->uc);
 838
 839         if (m->bytes == 0 && m->err)
 840                 return m->err;
 841
 842         return 0;
 843 }
 844
 845 int i915_error_state_buf_init(struct drm_i915_error_state_buf *ebuf,
 846                               struct drm_i915_private *i915,
 847                               size_t count, loff_t pos)
 848 {
 849         memset(ebuf, 0, sizeof(*ebuf));
 850         ebuf->i915 = i915;
 851
 852         /* We need to have enough room to store any i915_error_state printf
 853          * so that we can move it to start position.
 854          */
 855         ebuf->size = count + 1 > PAGE_SIZE ? count + 1 : PAGE_SIZE;
 856         ebuf->buf = kmalloc(ebuf->size,
 857                                 GFP_KERNEL | __GFP_NORETRY | __GFP_NOWARN);
 858
 859         if (ebuf->buf == NULL) {
 860                 ebuf->size = PAGE_SIZE;
 861                 ebuf->buf = kmalloc(ebuf->size, GFP_KERNEL);
 862         }
 863
 864         if (ebuf->buf == NULL) {
 865                 ebuf->size = 128;
 866                 ebuf->buf = kmalloc(ebuf->size, GFP_KERNEL);
 867         }
 868
 869         if (ebuf->buf == NULL)
 870                 return -ENOMEM;
 871
 872         ebuf->start = pos;
 873
 874         return 0;
 875 }
 876
 877 static void i915_error_object_free(struct drm_i915_error_object *obj)
 878 {
 879         int page;
 880
 881         if (obj == NULL)
 882                 return;
 883
 884         for (page = 0; page < obj->page_count; page++)
 885                 free_page((unsigned long)obj->pages[page]);
 886
 887         kfree(obj);
 888 }
 889
 890 static __always_inline void free_param(const char *type, void *x)
 891 {
 892         if (!__builtin_strcmp(type, "char *"))
 893                 kfree(*(void **)x);
 894 }
 895
 896 static void cleanup_params(struct i915_gpu_state *error)
 897 {
 898 #define FREE(T, x, ...) free_param(#T, &error->params.x);
 899         I915_PARAMS_FOR_EACH(FREE);
 900 #undef FREE
 901 }
 902
 903 static void cleanup_uc_state(struct i915_gpu_state *error)
 904 {
 905         struct i915_error_uc *error_uc = &error->uc;
 906
 907         kfree(error_uc->guc_fw.path);
 908         kfree(error_uc->huc_fw.path);
 909         i915_error_object_free(error_uc->guc_log);
 910 }
 911
 912 void __i915_gpu_state_free(struct kref *error_ref)
 913 {
 914         struct i915_gpu_state *error =
 915                 container_of(error_ref, typeof(*error), ref);
 916         long i, j;
 917
 918         for (i = 0; i < ARRAY_SIZE(error->engine); i++) {
 919                 struct drm_i915_error_engine *ee = &error->engine[i];
 920
 921                 for (j = 0; j < ee->user_bo_count; j++)
 922                         i915_error_object_free(ee->user_bo[j]);
 923                 kfree(ee->user_bo);
 924
 925                 i915_error_object_free(ee->batchbuffer);
 926                 i915_error_object_free(ee->wa_batchbuffer);
 927                 i915_error_object_free(ee->ringbuffer);
 928                 i915_error_object_free(ee->hws_page);
 929                 i915_error_object_free(ee->ctx);
 930                 i915_error_object_free(ee->wa_ctx);
 931
 932                 kfree(ee->requests);
 933                 if (!IS_ERR_OR_NULL(ee->waiters))
 934                         kfree(ee->waiters);
 935         }
 936
 937         for (i = 0; i < ARRAY_SIZE(error->active_bo); i++)
 938                 kfree(error->active_bo[i]);
 939         kfree(error->pinned_bo);
 940
 941         kfree(error->overlay);
 942         kfree(error->display);
 943
 944         cleanup_params(error);
 945         cleanup_uc_state(error);
 946
 947         kfree(error);
 948 }
 949
 950 static struct drm_i915_error_object *
 951 i915_error_object_create(struct drm_i915_private *i915,
 952                          struct i915_vma *vma)
 953 {
 954         struct i915_ggtt *ggtt = &i915->ggtt;
 955         const u64 slot = ggtt->error_capture.start;
 956         struct drm_i915_error_object *dst;
 957         struct compress compress;
 958         unsigned long num_pages;
 959         struct sgt_iter iter;
 960         dma_addr_t dma;
 961         int ret;
 962
 963         if (!vma)
 964                 return NULL;
 965
 966         num_pages = min_t(u64, vma->size, vma->obj->base.size) >> PAGE_SHIFT;
 967         num_pages = DIV_ROUND_UP(10 * num_pages, 8); /* worstcase zlib growth */
 968         dst = kmalloc(sizeof(*dst) + num_pages * sizeof(u32 *),
 969                       GFP_ATOMIC | __GFP_NOWARN);
 970         if (!dst)
 971                 return NULL;
 972
 973         dst->gtt_offset = vma->node.start;
 974         dst->gtt_size = vma->node.size;
 975         dst->num_pages = num_pages;
 976         dst->page_count = 0;
 977         dst->unused = 0;
 978
 979         if (!compress_init(&compress)) {
 980                 kfree(dst);
 981                 return NULL;
 982         }
 983
 984         ret = -EINVAL;
 985         for_each_sgt_dma(dma, iter, vma->pages) {
 986                 void __iomem *s;
 987
 988                 ggtt->vm.insert_page(&ggtt->vm, dma, slot, I915_CACHE_NONE, 0);
 989
 990                 s = io_mapping_map_atomic_wc(&ggtt->iomap, slot);
 991                 ret = compress_page(&compress, (void  __force *)s, dst);
 992                 io_mapping_unmap_atomic(s);
 993                 if (ret)
 994                         break;
 995         }
 996
 997         if (ret || compress_flush(&compress, dst)) {
 998                 while (dst->page_count--)
 999                         free_page((unsigned long)dst->pages[dst->page_count]);
1000                 kfree(dst);
1001                 dst = NULL;
1002         }
1003
1004         compress_fini(&compress, dst);
1005         ggtt->vm.clear_range(&ggtt->vm, slot, PAGE_SIZE);
1006         return dst;
1007 }
1008
1009 /* The error capture is special as tries to run underneath the normal
1010  * locking rules - so we use the raw version of the i915_gem_active lookup.
1011  */
1012 static inline uint32_t
1013 __active_get_seqno(struct i915_gem_active *active)
1014 {
1015         struct i915_request *request;
1016
1017         request = __i915_gem_active_peek(active);
1018         return request ? request->global_seqno : 0;
1019 }
1020
1021 static inline int
1022 __active_get_engine_id(struct i915_gem_active *active)
1023 {
1024         struct i915_request *request;
1025
1026         request = __i915_gem_active_peek(active);
1027         return request ? request->engine->id : -1;
1028 }
1029
1030 static void capture_bo(struct drm_i915_error_buffer *err,
1031                        struct i915_vma *vma)
1032 {
1033         struct drm_i915_gem_object *obj = vma->obj;
1034
1035         err->size = obj->base.size;
1036         err->name = obj->base.name;
1037
1038         err->wseqno = __active_get_seqno(&obj->frontbuffer_write);
1039         err->engine = __active_get_engine_id(&obj->frontbuffer_write);
1040
1041         err->gtt_offset = vma->node.start;
1042         err->read_domains = obj->read_domains;
1043         err->write_domain = obj->write_domain;
1044         err->fence_reg = vma->fence ? vma->fence->id : -1;
1045         err->tiling = i915_gem_object_get_tiling(obj);
1046         err->dirty = obj->mm.dirty;
1047         err->purgeable = obj->mm.madv != I915_MADV_WILLNEED;
1048         err->userptr = obj->userptr.mm != NULL;
1049         err->cache_level = obj->cache_level;
1050 }
1051
1052 static u32 capture_error_bo(struct drm_i915_error_buffer *err,
1053                             int count, struct list_head *head,
1054                             bool pinned_only)
1055 {
1056         struct i915_vma *vma;
1057         int i = 0;
1058
1059         list_for_each_entry(vma, head, vm_link) {
1060                 if (!vma->obj)
1061                         continue;
1062
1063                 if (pinned_only && !i915_vma_is_pinned(vma))
1064                         continue;
1065
1066                 capture_bo(err++, vma);
1067                 if (++i == count)
1068                         break;
1069         }
1070
1071         return i;
1072 }
1073
1074 /* Generate a semi-unique error code. The code is not meant to have meaning, The
1075  * code's only purpose is to try to prevent false duplicated bug reports by
1076  * grossly estimating a GPU error state.
1077  *
1078  * TODO Ideally, hashing the batchbuffer would be a very nice way to determine
1079  * the hang if we could strip the GTT offset information from it.
1080  *
1081  * It's only a small step better than a random number in its current form.
1082  */
1083 static uint32_t i915_error_generate_code(struct drm_i915_private *dev_priv,
1084                                          struct i915_gpu_state *error,
1085                                          int *engine_id)
1086 {
1087         uint32_t error_code = 0;
1088         int i;
1089
1090         /* IPEHR would be an ideal way to detect errors, as it's the gross
1091          * measure of "the command that hung." However, has some very common
1092          * synchronization commands which almost always appear in the case
1093          * strictly a client bug. Use instdone to differentiate those some.
1094          */
1095         for (i = 0; i < I915_NUM_ENGINES; i++) {
1096                 if (error->engine[i].hangcheck_stalled) {
1097                         if (engine_id)
1098                                 *engine_id = i;
1099
1100                         return error->engine[i].ipehr ^
1101                                error->engine[i].instdone.instdone;
1102                 }
1103         }
1104
1105         return error_code;
1106 }
1107
1108 static void gem_record_fences(struct i915_gpu_state *error)
1109 {
1110         struct drm_i915_private *dev_priv = error->i915;
1111         int i;
1112
1113         if (INTEL_GEN(dev_priv) >= 6) {
1114                 for (i = 0; i < dev_priv->num_fence_regs; i++)
1115                         error->fence[i] = I915_READ64(FENCE_REG_GEN6_LO(i));
1116         } else if (INTEL_GEN(dev_priv) >= 4) {
1117                 for (i = 0; i < dev_priv->num_fence_regs; i++)
1118                         error->fence[i] = I915_READ64(FENCE_REG_965_LO(i));
1119         } else {
1120                 for (i = 0; i < dev_priv->num_fence_regs; i++)
1121                         error->fence[i] = I915_READ(FENCE_REG(i));
1122         }
1123         error->nfence = i;
1124 }
1125
1126 static void gen6_record_semaphore_state(struct intel_engine_cs *engine,
1127                                         struct drm_i915_error_engine *ee)
1128 {
1129         struct drm_i915_private *dev_priv = engine->i915;
1130
1131         ee->semaphore_mboxes[0] = I915_READ(RING_SYNC_0(engine->mmio_base));
1132         ee->semaphore_mboxes[1] = I915_READ(RING_SYNC_1(engine->mmio_base));
1133         if (HAS_VEBOX(dev_priv))
1134                 ee->semaphore_mboxes[2] =
1135                         I915_READ(RING_SYNC_2(engine->mmio_base));
1136 }
1137
1138 static void error_record_engine_waiters(struct intel_engine_cs *engine,
1139                                         struct drm_i915_error_engine *ee)
1140 {
1141         struct intel_breadcrumbs *b = &engine->breadcrumbs;
1142         struct drm_i915_error_waiter *waiter;
1143         struct rb_node *rb;
1144         int count;
1145
1146         ee->num_waiters = 0;
1147         ee->waiters = NULL;
1148
1149         if (RB_EMPTY_ROOT(&b->waiters))
1150                 return;
1151
1152         if (!spin_trylock_irq(&b->rb_lock)) {
1153                 ee->waiters = ERR_PTR(-EDEADLK);
1154                 return;
1155         }
1156
1157         count = 0;
1158         for (rb = rb_first(&b->waiters); rb != NULL; rb = rb_next(rb))
1159                 count++;
1160         spin_unlock_irq(&b->rb_lock);
1161
1162         waiter = NULL;
1163         if (count)
1164                 waiter = kmalloc_array(count,
1165                                        sizeof(struct drm_i915_error_waiter),
1166                                        GFP_ATOMIC);
1167         if (!waiter)
1168                 return;
1169
1170         if (!spin_trylock_irq(&b->rb_lock)) {
1171                 kfree(waiter);
1172                 ee->waiters = ERR_PTR(-EDEADLK);
1173                 return;
1174         }
1175
1176         ee->waiters = waiter;
1177         for (rb = rb_first(&b->waiters); rb; rb = rb_next(rb)) {
1178                 struct intel_wait *w = rb_entry(rb, typeof(*w), node);
1179
1180                 strcpy(waiter->comm, w->tsk->comm);
1181                 waiter->pid = w->tsk->pid;
1182                 waiter->seqno = w->seqno;
1183                 waiter++;
1184
1185                 if (++ee->num_waiters == count)
1186                         break;
1187         }
1188         spin_unlock_irq(&b->rb_lock);
1189 }
1190
1191 static void error_record_engine_registers(struct i915_gpu_state *error,
1192                                           struct intel_engine_cs *engine,
1193                                           struct drm_i915_error_engine *ee)
1194 {
1195         struct drm_i915_private *dev_priv = engine->i915;
1196
1197         if (INTEL_GEN(dev_priv) >= 6) {
1198                 ee->rc_psmi = I915_READ(RING_PSMI_CTL(engine->mmio_base));
1199                 if (INTEL_GEN(dev_priv) >= 8) {
1200                         ee->fault_reg = I915_READ(GEN8_RING_FAULT_REG);
1201                 } else {
1202                         gen6_record_semaphore_state(engine, ee);
1203                         ee->fault_reg = I915_READ(RING_FAULT_REG(engine));
1204                 }
1205         }
1206
1207         if (INTEL_GEN(dev_priv) >= 4) {
1208                 ee->faddr = I915_READ(RING_DMA_FADD(engine->mmio_base));
1209                 ee->ipeir = I915_READ(RING_IPEIR(engine->mmio_base));
1210                 ee->ipehr = I915_READ(RING_IPEHR(engine->mmio_base));
1211                 ee->instps = I915_READ(RING_INSTPS(engine->mmio_base));
1212                 ee->bbaddr = I915_READ(RING_BBADDR(engine->mmio_base));
1213                 if (INTEL_GEN(dev_priv) >= 8) {
1214                         ee->faddr |= (u64) I915_READ(RING_DMA_FADD_UDW(engine->mmio_base)) << 32;
1215                         ee->bbaddr |= (u64) I915_READ(RING_BBADDR_UDW(engine->mmio_base)) << 32;
1216                 }
1217                 ee->bbstate = I915_READ(RING_BBSTATE(engine->mmio_base));
1218         } else {
1219                 ee->faddr = I915_READ(DMA_FADD_I8XX);
1220                 ee->ipeir = I915_READ(IPEIR);
1221                 ee->ipehr = I915_READ(IPEHR);
1222         }
1223
1224         intel_engine_get_instdone(engine, &ee->instdone);
1225
1226         ee->waiting = intel_engine_has_waiter(engine);
1227         ee->instpm = I915_READ(RING_INSTPM(engine->mmio_base));
1228         ee->acthd = intel_engine_get_active_head(engine);
1229         ee->seqno = intel_engine_get_seqno(engine);
1230         ee->last_seqno = intel_engine_last_submit(engine);
1231         ee->start = I915_READ_START(engine);
1232         ee->head = I915_READ_HEAD(engine);
1233         ee->tail = I915_READ_TAIL(engine);
1234         ee->ctl = I915_READ_CTL(engine);
1235         if (INTEL_GEN(dev_priv) > 2)
1236                 ee->mode = I915_READ_MODE(engine);
1237
1238         if (!HWS_NEEDS_PHYSICAL(dev_priv)) {
1239                 i915_reg_t mmio;
1240
1241                 if (IS_GEN7(dev_priv)) {
1242                         switch (engine->id) {
1243                         default:
1244                         case RCS:
1245                                 mmio = RENDER_HWS_PGA_GEN7;
1246                                 break;
1247                         case BCS:
1248                                 mmio = BLT_HWS_PGA_GEN7;
1249                                 break;
1250                         case VCS:
1251                                 mmio = BSD_HWS_PGA_GEN7;
1252                                 break;
1253                         case VECS:
1254                                 mmio = VEBOX_HWS_PGA_GEN7;
1255                                 break;
1256                         }
1257                 } else if (IS_GEN6(engine->i915)) {
1258                         mmio = RING_HWS_PGA_GEN6(engine->mmio_base);
1259                 } else {
1260                         /* XXX: gen8 returns to sanity */
1261                         mmio = RING_HWS_PGA(engine->mmio_base);
1262                 }
1263
1264                 ee->hws = I915_READ(mmio);
1265         }
1266
1267         ee->idle = intel_engine_is_idle(engine);
1268         ee->hangcheck_timestamp = engine->hangcheck.action_timestamp;
1269         ee->hangcheck_action = engine->hangcheck.action;
1270         ee->hangcheck_stalled = engine->hangcheck.stalled;
1271         ee->reset_count = i915_reset_engine_count(&dev_priv->gpu_error,
1272                                                   engine);
1273
1274         if (USES_PPGTT(dev_priv)) {
1275                 int i;
1276
1277                 ee->vm_info.gfx_mode = I915_READ(RING_MODE_GEN7(engine));
1278
1279                 if (IS_GEN6(dev_priv))
1280                         ee->vm_info.pp_dir_base =
1281                                 I915_READ(RING_PP_DIR_BASE_READ(engine));
1282                 else if (IS_GEN7(dev_priv))
1283                         ee->vm_info.pp_dir_base =
1284                                 I915_READ(RING_PP_DIR_BASE(engine));
1285                 else if (INTEL_GEN(dev_priv) >= 8)
1286                         for (i = 0; i < 4; i++) {
1287                                 ee->vm_info.pdp[i] =
1288                                         I915_READ(GEN8_RING_PDP_UDW(engine, i));
1289                                 ee->vm_info.pdp[i] <<= 32;
1290                                 ee->vm_info.pdp[i] |=
1291                                         I915_READ(GEN8_RING_PDP_LDW(engine, i));
1292                         }
1293         }
1294 }
1295
1296 static void record_request(struct i915_request *request,
1297                            struct drm_i915_error_request *erq)
1298 {
1299         struct i915_gem_context *ctx = request->gem_context;
1300
1301         erq->context = ctx->hw_id;
1302         erq->sched_attr = request->sched.attr;
1303         erq->ban_score = atomic_read(&ctx->ban_score);
1304         erq->seqno = request->global_seqno;
1305         erq->jiffies = request->emitted_jiffies;
1306         erq->start = i915_ggtt_offset(request->ring->vma);
1307         erq->head = request->head;
1308         erq->tail = request->tail;
1309
1310         rcu_read_lock();
1311         erq->pid = ctx->pid ? pid_nr(ctx->pid) : 0;
1312         rcu_read_unlock();
1313 }
1314
1315 static void engine_record_requests(struct intel_engine_cs *engine,
1316                                    struct i915_request *first,
1317                                    struct drm_i915_error_engine *ee)
1318 {
1319         struct i915_request *request;
1320         int count;
1321
1322         count = 0;
1323         request = first;
1324         list_for_each_entry_from(request, &engine->timeline.requests, link)
1325                 count++;
1326         if (!count)
1327                 return;
1328
1329         ee->requests = kcalloc(count, sizeof(*ee->requests), GFP_ATOMIC);
1330         if (!ee->requests)
1331                 return;
1332
1333         ee->num_requests = count;
1334
1335         count = 0;
1336         request = first;
1337         list_for_each_entry_from(request, &engine->timeline.requests, link) {
1338                 if (count >= ee->num_requests) {
1339                         /*
1340                          * If the ring request list was changed in
1341                          * between the point where the error request
1342                          * list was created and dimensioned and this
1343                          * point then just exit early to avoid crashes.
1344                          *
1345                          * We don't need to communicate that the
1346                          * request list changed state during error
1347                          * state capture and that the error state is
1348                          * slightly incorrect as a consequence since we
1349                          * are typically only interested in the request
1350                          * list state at the point of error state
1351                          * capture, not in any changes happening during
1352                          * the capture.
1353                          */
1354                         break;
1355                 }
1356
1357                 record_request(request, &ee->requests[count++]);
1358         }
1359         ee->num_requests = count;
1360 }
1361
1362 static void error_record_engine_execlists(struct intel_engine_cs *engine,
1363                                           struct drm_i915_error_engine *ee)
1364 {
1365         const struct intel_engine_execlists * const execlists = &engine->execlists;
1366         unsigned int n;
1367
1368         for (n = 0; n < execlists_num_ports(execlists); n++) {
1369                 struct i915_request *rq = port_request(&execlists->port[n]);
1370
1371                 if (!rq)
1372                         break;
1373
1374                 record_request(rq, &ee->execlist[n]);
1375         }
1376
1377         ee->num_ports = n;
1378 }
1379
1380 static void record_context(struct drm_i915_error_context *e,
1381                            struct i915_gem_context *ctx)
1382 {
1383         if (ctx->pid) {
1384                 struct task_struct *task;
1385
1386                 rcu_read_lock();
1387                 task = pid_task(ctx->pid, PIDTYPE_PID);
1388                 if (task) {
1389                         strcpy(e->comm, task->comm);
1390                         e->pid = task->pid;
1391                 }
1392                 rcu_read_unlock();
1393         }
1394
1395         e->handle = ctx->user_handle;
1396         e->hw_id = ctx->hw_id;
1397         e->sched_attr = ctx->sched;
1398         e->ban_score = atomic_read(&ctx->ban_score);
1399         e->bannable = i915_gem_context_is_bannable(ctx);
1400         e->guilty = atomic_read(&ctx->guilty_count);
1401         e->active = atomic_read(&ctx->active_count);
1402 }
1403
1404 static void request_record_user_bo(struct i915_request *request,
1405                                    struct drm_i915_error_engine *ee)
1406 {
1407         struct i915_capture_list *c;
1408         struct drm_i915_error_object **bo;
1409         long count, max;
1410
1411         max = 0;
1412         for (c = request->capture_list; c; c = c->next)
1413                 max++;
1414         if (!max)
1415                 return;
1416
1417         bo = kmalloc_array(max, sizeof(*bo), GFP_ATOMIC);
1418         if (!bo) {
1419                 /* If we can't capture everything, try to capture something. */
1420                 max = min_t(long, max, PAGE_SIZE / sizeof(*bo));
1421                 bo = kmalloc_array(max, sizeof(*bo), GFP_ATOMIC);
1422         }
1423         if (!bo)
1424                 return;
1425
1426         count = 0;
1427         for (c = request->capture_list; c; c = c->next) {
1428                 bo[count] = i915_error_object_create(request->i915, c->vma);
1429                 if (!bo[count])
1430                         break;
1431                 if (++count == max)
1432                         break;
1433         }
1434
1435         ee->user_bo = bo;
1436         ee->user_bo_count = count;
1437 }
1438
1439 static struct drm_i915_error_object *
1440 capture_object(struct drm_i915_private *dev_priv,
1441                struct drm_i915_gem_object *obj)
1442 {
1443         if (obj && i915_gem_object_has_pages(obj)) {
1444                 struct i915_vma fake = {
1445                         .node = { .start = U64_MAX, .size = obj->base.size },
1446                         .size = obj->base.size,
1447                         .pages = obj->mm.pages,
1448                         .obj = obj,
1449                 };
1450
1451                 return i915_error_object_create(dev_priv, &fake);
1452         } else {
1453                 return NULL;
1454         }
1455 }
1456
1457 static void gem_record_rings(struct i915_gpu_state *error)
1458 {
1459         struct drm_i915_private *i915 = error->i915;
1460         struct i915_ggtt *ggtt = &i915->ggtt;
1461         int i;
1462
1463         for (i = 0; i < I915_NUM_ENGINES; i++) {
1464                 struct intel_engine_cs *engine = i915->engine[i];
1465                 struct drm_i915_error_engine *ee = &error->engine[i];
1466                 struct i915_request *request;
1467
1468                 ee->engine_id = -1;
1469
1470                 if (!engine)
1471                         continue;
1472
1473                 ee->engine_id = i;
1474
1475                 error_record_engine_registers(error, engine, ee);
1476                 error_record_engine_waiters(engine, ee);
1477                 error_record_engine_execlists(engine, ee);
1478
1479                 request = i915_gem_find_active_request(engine);
1480                 if (request) {
1481                         struct i915_gem_context *ctx = request->gem_context;
1482                         struct intel_ring *ring;
1483
1484                         ee->vm = ctx->ppgtt ? &ctx->ppgtt->vm : &ggtt->vm;
1485
1486                         record_context(&ee->context, ctx);
1487
1488                         /* We need to copy these to an anonymous buffer
1489                          * as the simplest method to avoid being overwritten
1490                          * by userspace.
1491                          */
1492                         ee->batchbuffer =
1493                                 i915_error_object_create(i915, request->batch);
1494
1495                         if (HAS_BROKEN_CS_TLB(i915))
1496                                 ee->wa_batchbuffer =
1497                                         i915_error_object_create(i915,
1498                                                                  engine->scratch);
1499                         request_record_user_bo(request, ee);
1500
1501                         ee->ctx =
1502                                 i915_error_object_create(i915,
1503                                                          request->hw_context->state);
1504
1505                         error->simulated |=
1506                                 i915_gem_context_no_error_capture(ctx);
1507
1508                         ee->rq_head = request->head;
1509                         ee->rq_post = request->postfix;
1510                         ee->rq_tail = request->tail;
1511
1512                         ring = request->ring;
1513                         ee->cpu_ring_head = ring->head;
1514                         ee->cpu_ring_tail = ring->tail;
1515                         ee->ringbuffer =
1516                                 i915_error_object_create(i915, ring->vma);
1517
1518                         engine_record_requests(engine, request, ee);
1519                 }
1520
1521                 ee->hws_page =
1522                         i915_error_object_create(i915,
1523                                                  engine->status_page.vma);
1524
1525                 ee->wa_ctx = i915_error_object_create(i915, engine->wa_ctx.vma);
1526
1527                 ee->default_state = capture_object(i915, engine->default_state);
1528         }
1529 }
1530
1531 static void gem_capture_vm(struct i915_gpu_state *error,
1532                            struct i915_address_space *vm,
1533                            int idx)
1534 {
1535         struct drm_i915_error_buffer *active_bo;
1536         struct i915_vma *vma;
1537         int count;
1538
1539         count = 0;
1540         list_for_each_entry(vma, &vm->active_list, vm_link)
1541                 count++;
1542
1543         active_bo = NULL;
1544         if (count)
1545                 active_bo = kcalloc(count, sizeof(*active_bo), GFP_ATOMIC);
1546         if (active_bo)
1547                 count = capture_error_bo(active_bo, count, &vm->active_list, false);
1548         else
1549                 count = 0;
1550
1551         error->active_vm[idx] = vm;
1552         error->active_bo[idx] = active_bo;
1553         error->active_bo_count[idx] = count;
1554 }
1555
1556 static void capture_active_buffers(struct i915_gpu_state *error)
1557 {
1558         int cnt = 0, i, j;
1559
1560         BUILD_BUG_ON(ARRAY_SIZE(error->engine) > ARRAY_SIZE(error->active_bo));
1561         BUILD_BUG_ON(ARRAY_SIZE(error->active_bo) != ARRAY_SIZE(error->active_vm));
1562         BUILD_BUG_ON(ARRAY_SIZE(error->active_bo) != ARRAY_SIZE(error->active_bo_count));
1563
1564         /* Scan each engine looking for unique active contexts/vm */
1565         for (i = 0; i < ARRAY_SIZE(error->engine); i++) {
1566                 struct drm_i915_error_engine *ee = &error->engine[i];
1567                 bool found;
1568
1569                 if (!ee->vm)
1570                         continue;
1571
1572                 found = false;
1573                 for (j = 0; j < i && !found; j++)
1574                         found = error->engine[j].vm == ee->vm;
1575                 if (!found)
1576                         gem_capture_vm(error, ee->vm, cnt++);
1577         }
1578 }
1579
1580 static void capture_pinned_buffers(struct i915_gpu_state *error)
1581 {
1582         struct i915_address_space *vm = &error->i915->ggtt.vm;
1583         struct drm_i915_error_buffer *bo;
1584         struct i915_vma *vma;
1585         int count_inactive, count_active;
1586
1587         count_inactive = 0;
1588         list_for_each_entry(vma, &vm->inactive_list, vm_link)
1589                 count_inactive++;
1590
1591         count_active = 0;
1592         list_for_each_entry(vma, &vm->active_list, vm_link)
1593                 count_active++;
1594
1595         bo = NULL;
1596         if (count_inactive + count_active)
1597                 bo = kcalloc(count_inactive + count_active,
1598                              sizeof(*bo), GFP_ATOMIC);
1599         if (!bo)
1600                 return;
1601
1602         count_inactive = capture_error_bo(bo, count_inactive,
1603                                           &vm->active_list, true);
1604         count_active = capture_error_bo(bo + count_inactive, count_active,
1605                                         &vm->inactive_list, true);
1606         error->pinned_bo_count = count_inactive + count_active;
1607         error->pinned_bo = bo;
1608 }
1609
1610 static void capture_uc_state(struct i915_gpu_state *error)
1611 {
1612         struct drm_i915_private *i915 = error->i915;
1613         struct i915_error_uc *error_uc = &error->uc;
1614
1615         /* Capturing uC state won't be useful if there is no GuC */
1616         if (!error->device_info.has_guc)
1617                 return;
1618
1619         error_uc->guc_fw = i915->guc.fw;
1620         error_uc->huc_fw = i915->huc.fw;
1621
1622         /* Non-default firmware paths will be specified by the modparam.
1623          * As modparams are generally accesible from the userspace make
1624          * explicit copies of the firmware paths.
1625          */
1626         error_uc->guc_fw.path = kstrdup(i915->guc.fw.path, GFP_ATOMIC);
1627         error_uc->huc_fw.path = kstrdup(i915->huc.fw.path, GFP_ATOMIC);
1628         error_uc->guc_log = i915_error_object_create(i915, i915->guc.log.vma);
1629 }
1630
1631 /* Capture all registers which don't fit into another category. */
1632 static void capture_reg_state(struct i915_gpu_state *error)
1633 {
1634         struct drm_i915_private *dev_priv = error->i915;
1635         int i;
1636
1637         /* General organization
1638          * 1. Registers specific to a single generation
1639          * 2. Registers which belong to multiple generations
1640          * 3. Feature specific registers.
1641          * 4. Everything else
1642          * Please try to follow the order.
1643          */
1644
1645         /* 1: Registers specific to a single generation */
1646         if (IS_VALLEYVIEW(dev_priv)) {
1647                 error->gtier[0] = I915_READ(GTIER);
1648                 error->ier = I915_READ(VLV_IER);
1649                 error->forcewake = I915_READ_FW(FORCEWAKE_VLV);
1650         }
1651
1652         if (IS_GEN7(dev_priv))
1653                 error->err_int = I915_READ(GEN7_ERR_INT);
1654
1655         if (INTEL_GEN(dev_priv) >= 8) {
1656                 error->fault_data0 = I915_READ(GEN8_FAULT_TLB_DATA0);
1657                 error->fault_data1 = I915_READ(GEN8_FAULT_TLB_DATA1);
1658         }
1659
1660         if (IS_GEN6(dev_priv)) {
1661                 error->forcewake = I915_READ_FW(FORCEWAKE);
1662                 error->gab_ctl = I915_READ(GAB_CTL);
1663                 error->gfx_mode = I915_READ(GFX_MODE);
1664         }
1665
1666         /* 2: Registers which belong to multiple generations */
1667         if (INTEL_GEN(dev_priv) >= 7)
1668                 error->forcewake = I915_READ_FW(FORCEWAKE_MT);
1669
1670         if (INTEL_GEN(dev_priv) >= 6) {
1671                 error->derrmr = I915_READ(DERRMR);
1672                 error->error = I915_READ(ERROR_GEN6);
1673                 error->done_reg = I915_READ(DONE_REG);
1674         }
1675
1676         if (INTEL_GEN(dev_priv) >= 5)
1677                 error->ccid = I915_READ(CCID);
1678
1679         /* 3: Feature specific registers */
1680         if (IS_GEN6(dev_priv) || IS_GEN7(dev_priv)) {
1681                 error->gam_ecochk = I915_READ(GAM_ECOCHK);
1682                 error->gac_eco = I915_READ(GAC_ECO_BITS);
1683         }
1684
1685         /* 4: Everything else */
1686         if (INTEL_GEN(dev_priv) >= 11) {
1687                 error->ier = I915_READ(GEN8_DE_MISC_IER);
1688                 error->gtier[0] = I915_READ(GEN11_RENDER_COPY_INTR_ENABLE);
1689                 error->gtier[1] = I915_READ(GEN11_VCS_VECS_INTR_ENABLE);
1690                 error->gtier[2] = I915_READ(GEN11_GUC_SG_INTR_ENABLE);
1691                 error->gtier[3] = I915_READ(GEN11_GPM_WGBOXPERF_INTR_ENABLE);
1692                 error->gtier[4] = I915_READ(GEN11_CRYPTO_RSVD_INTR_ENABLE);
1693                 error->gtier[5] = I915_READ(GEN11_GUNIT_CSME_INTR_ENABLE);
1694                 error->ngtier = 6;
1695         } else if (INTEL_GEN(dev_priv) >= 8) {
1696                 error->ier = I915_READ(GEN8_DE_MISC_IER);
1697                 for (i = 0; i < 4; i++)
1698                         error->gtier[i] = I915_READ(GEN8_GT_IER(i));
1699                 error->ngtier = 4;
1700         } else if (HAS_PCH_SPLIT(dev_priv)) {
1701                 error->ier = I915_READ(DEIER);
1702                 error->gtier[0] = I915_READ(GTIER);
1703                 error->ngtier = 1;
1704         } else if (IS_GEN2(dev_priv)) {
1705                 error->ier = I915_READ16(IER);
1706         } else if (!IS_VALLEYVIEW(dev_priv)) {
1707                 error->ier = I915_READ(IER);
1708         }
1709         error->eir = I915_READ(EIR);
1710         error->pgtbl_er = I915_READ(PGTBL_ER);
1711 }
1712
1713 static void i915_error_capture_msg(struct drm_i915_private *dev_priv,
1714                                    struct i915_gpu_state *error,
1715                                    u32 engine_mask,
1716                                    const char *error_msg)
1717 {
1718         u32 ecode;
1719         int engine_id = -1, len;
1720
1721         ecode = i915_error_generate_code(dev_priv, error, &engine_id);
1722
1723         len = scnprintf(error->error_msg, sizeof(error->error_msg),
1724                         "GPU HANG: ecode %d:%d:0x%08x",
1725                         INTEL_GEN(dev_priv), engine_id, ecode);
1726
1727         if (engine_id != -1 && error->engine[engine_id].context.pid)
1728                 len += scnprintf(error->error_msg + len,
1729                                  sizeof(error->error_msg) - len,
1730                                  ", in %s [%d]",
1731                                  error->engine[engine_id].context.comm,
1732                                  error->engine[engine_id].context.pid);
1733
1734         scnprintf(error->error_msg + len, sizeof(error->error_msg) - len,
1735                   ", reason: %s, action: %s",
1736                   error_msg,
1737                   engine_mask ? "reset" : "continue");
1738 }
1739
1740 static void capture_gen_state(struct i915_gpu_state *error)
1741 {
1742         struct drm_i915_private *i915 = error->i915;
1743
1744         error->awake = i915->gt.awake;
1745         error->wakelock = atomic_read(&i915->runtime_pm.wakeref_count);
1746         error->suspended = i915->runtime_pm.suspended;
1747
1748         error->iommu = -1;
1749 #ifdef CONFIG_INTEL_IOMMU
1750         error->iommu = intel_iommu_gfx_mapped;
1751 #endif
1752         error->reset_count = i915_reset_count(&i915->gpu_error);
1753         error->suspend_count = i915->suspend_count;
1754
1755         memcpy(&error->device_info,
1756                INTEL_INFO(i915),
1757                sizeof(error->device_info));
1758         error->driver_caps = i915->caps;
1759 }
1760
1761 static __always_inline void dup_param(const char *type, void *x)
1762 {
1763         if (!__builtin_strcmp(type, "char *"))
1764                 *(void **)x = kstrdup(*(void **)x, GFP_ATOMIC);
1765 }
1766
1767 static void capture_params(struct i915_gpu_state *error)
1768 {
1769         error->params = i915_modparams;
1770 #define DUP(T, x, ...) dup_param(#T, &error->params.x);
1771         I915_PARAMS_FOR_EACH(DUP);
1772 #undef DUP
1773 }
1774
1775 static unsigned long capture_find_epoch(const struct i915_gpu_state *error)
1776 {
1777         unsigned long epoch = error->capture;
1778         int i;
1779
1780         for (i = 0; i < ARRAY_SIZE(error->engine); i++) {
1781                 const struct drm_i915_error_engine *ee = &error->engine[i];
1782
1783                 if (ee->hangcheck_stalled &&
1784                     time_before(ee->hangcheck_timestamp, epoch))
1785                         epoch = ee->hangcheck_timestamp;
1786         }
1787
1788         return epoch;
1789 }
1790
1791 static int capture(void *data)
1792 {
1793         struct i915_gpu_state *error = data;
1794
1795         error->time = ktime_get_real();
1796         error->boottime = ktime_get_boottime();
1797         error->uptime = ktime_sub(ktime_get(),
1798                                   error->i915->gt.last_init_time);
1799         error->capture = jiffies;
1800
1801         capture_params(error);
1802         capture_gen_state(error);
1803         capture_uc_state(error);
1804         capture_reg_state(error);
1805         gem_record_fences(error);
1806         gem_record_rings(error);
1807         capture_active_buffers(error);
1808         capture_pinned_buffers(error);
1809
1810         error->overlay = intel_overlay_capture_error_state(error->i915);
1811         error->display = intel_display_capture_error_state(error->i915);
1812
1813         error->epoch = capture_find_epoch(error);
1814
1815         return 0;
1816 }
1817
1818 #define DAY_AS_SECONDS(x) (24 * 60 * 60 * (x))
1819
1820 struct i915_gpu_state *
1821 i915_capture_gpu_state(struct drm_i915_private *i915)
1822 {
1823         struct i915_gpu_state *error;
1824
1825         error = kzalloc(sizeof(*error), GFP_ATOMIC);
1826         if (!error)
1827                 return NULL;
1828
1829         kref_init(&error->ref);
1830         error->i915 = i915;
1831
1832         stop_machine(capture, error, NULL);
1833
1834         return error;
1835 }
1836
1837 /**
1838  * i915_capture_error_state - capture an error record for later analysis
1839  * @i915: i915 device
1840  * @engine_mask: the mask of engines triggering the hang
1841  * @error_msg: a message to insert into the error capture header
1842  *
1843  * Should be called when an error is detected (either a hang or an error
1844  * interrupt) to capture error state from the time of the error.  Fills
1845  * out a structure which becomes available in debugfs for user level tools
1846  * to pick up.
1847  */
1848 void i915_capture_error_state(struct drm_i915_private *i915,
1849                               u32 engine_mask,
1850                               const char *error_msg)
1851 {
1852         static bool warned;
1853         struct i915_gpu_state *error;
1854         unsigned long flags;
1855
1856         if (!i915_modparams.error_capture)
1857                 return;
1858
1859         if (READ_ONCE(i915->gpu_error.first_error))
1860                 return;
1861
1862         error = i915_capture_gpu_state(i915);
1863         if (!error) {
1864                 DRM_DEBUG_DRIVER("out of memory, not capturing error state\n");
1865                 i915_disable_error_state(i915, -ENOMEM);
1866                 return;
1867         }
1868
1869         i915_error_capture_msg(i915, error, engine_mask, error_msg);
1870         DRM_INFO("%s\n", error->error_msg);
1871
1872         if (!error->simulated) {
1873                 spin_lock_irqsave(&i915->gpu_error.lock, flags);
1874                 if (!i915->gpu_error.first_error) {
1875                         i915->gpu_error.first_error = error;
1876                         error = NULL;
1877                 }
1878                 spin_unlock_irqrestore(&i915->gpu_error.lock, flags);
1879         }
1880
1881         if (error) {
1882                 __i915_gpu_state_free(&error->ref);
1883                 return;
1884         }
1885
1886         if (!warned &&
1887             ktime_get_real_seconds() - DRIVER_TIMESTAMP < DAY_AS_SECONDS(180)) {
1888                 DRM_INFO("GPU hangs can indicate a bug anywhere in the entire gfx stack, including userspace.\n");
1889                 DRM_INFO("Please file a _new_ bug report on bugs.freedesktop.org against DRI -> DRM/Intel\n");
1890                 DRM_INFO("drm/i915 developers can then reassign to the right component if it's not a kernel issue.\n");
1891                 DRM_INFO("The gpu crash dump is required to analyze gpu hangs, so please always attach it.\n");
1892                 DRM_INFO("GPU crash dump saved to /sys/class/drm/card%d/error\n",
1893                          i915->drm.primary->index);
1894                 warned = true;
1895         }
1896 }
1897
1898 struct i915_gpu_state *
1899 i915_first_error_state(struct drm_i915_private *i915)
1900 {
1901         struct i915_gpu_state *error;
1902
1903         spin_lock_irq(&i915->gpu_error.lock);
1904         error = i915->gpu_error.first_error;
1905         if (error)
1906                 i915_gpu_state_get(error);
1907         spin_unlock_irq(&i915->gpu_error.lock);
1908
1909         return error;
1910 }
1911
1912 void i915_reset_error_state(struct drm_i915_private *i915)
1913 {
1914         struct i915_gpu_state *error;
1915
1916         spin_lock_irq(&i915->gpu_error.lock);
1917         error = i915->gpu_error.first_error;
1918         i915->gpu_error.first_error = NULL;
1919         spin_unlock_irq(&i915->gpu_error.lock);
1920
1921         if (!IS_ERR(error))
1922                 i915_gpu_state_put(error);
1923 }
1924
1925 void i915_disable_error_state(struct drm_i915_private *i915, int err)
1926 {
1927         spin_lock_irq(&i915->gpu_error.lock);
1928         if (!i915->gpu_error.first_error)
1929                 i915->gpu_error.first_error = ERR_PTR(err);
1930         spin_unlock_irq(&i915->gpu_error.lock);
1931 }