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 <eric@anholt.net>
  25  *    Keith Packard <keithp@keithp.com>
  26  *    Mika Kuoppala <mika.kuoppala@intel.com>
  27  *
  28  */
  29
  30 #include <generated/utsrelease.h>
  31 #include <linux/stop_machine.h>
  32 #include <linux/zlib.h>
  33 #include "i915_drv.h"
  34
  35 static const char *engine_str(int engine)
  36 {
  37         switch (engine) {
  38         case RCS: return "render";
  39         case VCS: return "bsd";
  40         case BCS: return "blt";
  41         case VECS: return "vebox";
  42         case VCS2: return "bsd2";
  43         default: return "";
  44         }
  45 }
  46
  47 static const char *tiling_flag(int tiling)
  48 {
  49         switch (tiling) {
  50         default:
  51         case I915_TILING_NONE: return "";
  52         case I915_TILING_X: return " X";
  53         case I915_TILING_Y: return " Y";
  54         }
  55 }
  56
  57 static const char *dirty_flag(int dirty)
  58 {
  59         return dirty ? " dirty" : "";
  60 }
  61
  62 static const char *purgeable_flag(int purgeable)
  63 {
  64         return purgeable ? " purgeable" : "";
  65 }
  66
  67 static bool __i915_error_ok(struct drm_i915_error_state_buf *e)
  68 {
  69
  70         if (!e->err && WARN(e->bytes > (e->size - 1), "overflow")) {
  71                 e->err = -ENOSPC;
  72                 return false;
  73         }
  74
  75         if (e->bytes == e->size - 1 || e->err)
  76                 return false;
  77
  78         return true;
  79 }
  80
  81 static bool __i915_error_seek(struct drm_i915_error_state_buf *e,
  82                               unsigned len)
  83 {
  84         if (e->pos + len <= e->start) {
  85                 e->pos += len;
  86                 return false;
  87         }
  88
  89         /* First vsnprintf needs to fit in its entirety for memmove */
  90         if (len >= e->size) {
  91                 e->err = -EIO;
  92                 return false;
  93         }
  94
  95         return true;
  96 }
  97
  98 static void __i915_error_advance(struct drm_i915_error_state_buf *e,
  99                                  unsigned len)
 100 {
 101         /* If this is first printf in this window, adjust it so that
 102          * start position matches start of the buffer
 103          */
 104
 105         if (e->pos < e->start) {
 106                 const size_t off = e->start - e->pos;
 107
 108                 /* Should not happen but be paranoid */
 109                 if (off > len || e->bytes) {
 110                         e->err = -EIO;
 111                         return;
 112                 }
 113
 114                 memmove(e->buf, e->buf + off, len - off);
 115                 e->bytes = len - off;
 116                 e->pos = e->start;
 117                 return;
 118         }
 119
 120         e->bytes += len;
 121         e->pos += len;
 122 }
 123
 124 static void i915_error_vprintf(struct drm_i915_error_state_buf *e,
 125                                const char *f, va_list args)
 126 {
 127         unsigned len;
 128
 129         if (!__i915_error_ok(e))
 130                 return;
 131
 132         /* Seek the first printf which is hits start position */
 133         if (e->pos < e->start) {
 134                 va_list tmp;
 135
 136                 va_copy(tmp, args);
 137                 len = vsnprintf(NULL, 0, f, tmp);
 138                 va_end(tmp);
 139
 140                 if (!__i915_error_seek(e, len))
 141                         return;
 142         }
 143
 144         len = vsnprintf(e->buf + e->bytes, e->size - e->bytes, f, args);
 145         if (len >= e->size - e->bytes)
 146                 len = e->size - e->bytes - 1;
 147
 148         __i915_error_advance(e, len);
 149 }
 150
 151 static void i915_error_puts(struct drm_i915_error_state_buf *e,
 152                             const char *str)
 153 {
 154         unsigned len;
 155
 156         if (!__i915_error_ok(e))
 157                 return;
 158
 159         len = strlen(str);
 160
 161         /* Seek the first printf which is hits start position */
 162         if (e->pos < e->start) {
 163                 if (!__i915_error_seek(e, len))
 164                         return;
 165         }
 166
 167         if (len >= e->size - e->bytes)
 168                 len = e->size - e->bytes - 1;
 169         memcpy(e->buf + e->bytes, str, len);
 170
 171         __i915_error_advance(e, len);
 172 }
 173
 174 #define err_printf(e, ...) i915_error_printf(e, __VA_ARGS__)
 175 #define err_puts(e, s) i915_error_puts(e, s)
 176
 177 #ifdef CONFIG_DRM_I915_COMPRESS_ERROR
 178
 179 static bool compress_init(struct z_stream_s *zstream)
 180 {
 181         memset(zstream, 0, sizeof(*zstream));
 182
 183         zstream->workspace =
 184                 kmalloc(zlib_deflate_workspacesize(MAX_WBITS, MAX_MEM_LEVEL),
 185                         GFP_ATOMIC | __GFP_NOWARN);
 186         if (!zstream->workspace)
 187                 return false;
 188
 189         if (zlib_deflateInit(zstream, Z_DEFAULT_COMPRESSION) != Z_OK) {
 190                 kfree(zstream->workspace);
 191                 return false;
 192         }
 193
 194         return true;
 195 }
 196
 197 static int compress_page(struct z_stream_s *zstream,
 198                          void *src,
 199                          struct drm_i915_error_object *dst)
 200 {
 201         zstream->next_in = src;
 202         zstream->avail_in = PAGE_SIZE;
 203
 204         do {
 205                 if (zstream->avail_out == 0) {
 206                         unsigned long page;
 207
 208                         page = __get_free_page(GFP_ATOMIC | __GFP_NOWARN);
 209                         if (!page)
 210                                 return -ENOMEM;
 211
 212                         dst->pages[dst->page_count++] = (void *)page;
 213
 214                         zstream->next_out = (void *)page;
 215                         zstream->avail_out = PAGE_SIZE;
 216                 }
 217
 218                 if (zlib_deflate(zstream, Z_SYNC_FLUSH) != Z_OK)
 219                         return -EIO;
 220         } while (zstream->avail_in);
 221
 222         /* Fallback to uncompressed if we increase size? */
 223         if (0 && zstream->total_out > zstream->total_in)
 224                 return -E2BIG;
 225
 226         return 0;
 227 }
 228
 229 static void compress_fini(struct z_stream_s *zstream,
 230                           struct drm_i915_error_object *dst)
 231 {
 232         if (dst) {
 233                 zlib_deflate(zstream, Z_FINISH);
 234                 dst->unused = zstream->avail_out;
 235         }
 236
 237         zlib_deflateEnd(zstream);
 238         kfree(zstream->workspace);
 239 }
 240
 241 static void err_compression_marker(struct drm_i915_error_state_buf *m)
 242 {
 243         err_puts(m, ":");
 244 }
 245
 246 #else
 247
 248 static bool compress_init(struct z_stream_s *zstream)
 249 {
 250         return true;
 251 }
 252
 253 static int compress_page(struct z_stream_s *zstream,
 254                          void *src,
 255                          struct drm_i915_error_object *dst)
 256 {
 257         unsigned long page;
 258
 259         page = __get_free_page(GFP_ATOMIC | __GFP_NOWARN);
 260         if (!page)
 261                 return -ENOMEM;
 262
 263         dst->pages[dst->page_count++] =
 264                 memcpy((void *)page, src, PAGE_SIZE);
 265
 266         return 0;
 267 }
 268
 269 static void compress_fini(struct z_stream_s *zstream,
 270                           struct drm_i915_error_object *dst)
 271 {
 272 }
 273
 274 static void err_compression_marker(struct drm_i915_error_state_buf *m)
 275 {
 276         err_puts(m, "~");
 277 }
 278
 279 #endif
 280
 281 static void print_error_buffers(struct drm_i915_error_state_buf *m,
 282                                 const char *name,
 283                                 struct drm_i915_error_buffer *err,
 284                                 int count)
 285 {
 286         int i;
 287
 288         err_printf(m, "%s [%d]:\n", name, count);
 289
 290         while (count--) {
 291                 err_printf(m, "    %08x_%08x %8u %02x %02x [ ",
 292                            upper_32_bits(err->gtt_offset),
 293                            lower_32_bits(err->gtt_offset),
 294                            err->size,
 295                            err->read_domains,
 296                            err->write_domain);
 297                 for (i = 0; i < I915_NUM_ENGINES; i++)
 298                         err_printf(m, "%02x ", err->rseqno[i]);
 299
 300                 err_printf(m, "] %02x", err->wseqno);
 301                 err_puts(m, tiling_flag(err->tiling));
 302                 err_puts(m, dirty_flag(err->dirty));
 303                 err_puts(m, purgeable_flag(err->purgeable));
 304                 err_puts(m, err->userptr ? " userptr" : "");
 305                 err_puts(m, err->engine != -1 ? " " : "");
 306                 err_puts(m, engine_str(err->engine));
 307                 err_puts(m, i915_cache_level_str(m->i915, err->cache_level));
 308
 309                 if (err->name)
 310                         err_printf(m, " (name: %d)", err->name);
 311                 if (err->fence_reg != I915_FENCE_REG_NONE)
 312                         err_printf(m, " (fence: %d)", err->fence_reg);
 313
 314                 err_puts(m, "\n");
 315                 err++;
 316         }
 317 }
 318
 319 static const char *hangcheck_action_to_str(enum intel_engine_hangcheck_action a)
 320 {
 321         switch (a) {
 322         case HANGCHECK_IDLE:
 323                 return "idle";
 324         case HANGCHECK_WAIT:
 325                 return "wait";
 326         case HANGCHECK_ACTIVE:
 327                 return "active";
 328         case HANGCHECK_KICK:
 329                 return "kick";
 330         case HANGCHECK_HUNG:
 331                 return "hung";
 332         }
 333
 334         return "unknown";
 335 }
 336
 337 static void error_print_instdone(struct drm_i915_error_state_buf *m,
 338                                  struct drm_i915_error_engine *ee)
 339 {
 340         int slice;
 341         int subslice;
 342
 343         err_printf(m, "  INSTDONE: 0x%08x\n",
 344                    ee->instdone.instdone);
 345
 346         if (ee->engine_id != RCS || INTEL_GEN(m->i915) <= 3)
 347                 return;
 348
 349         err_printf(m, "  SC_INSTDONE: 0x%08x\n",
 350                    ee->instdone.slice_common);
 351
 352         if (INTEL_GEN(m->i915) <= 6)
 353                 return;
 354
 355         for_each_instdone_slice_subslice(m->i915, slice, subslice)
 356                 err_printf(m, "  SAMPLER_INSTDONE[%d][%d]: 0x%08x\n",
 357                            slice, subslice,
 358                            ee->instdone.sampler[slice][subslice]);
 359
 360         for_each_instdone_slice_subslice(m->i915, slice, subslice)
 361                 err_printf(m, "  ROW_INSTDONE[%d][%d]: 0x%08x\n",
 362                            slice, subslice,
 363                            ee->instdone.row[slice][subslice]);
 364 }
 365
 366 static void error_print_request(struct drm_i915_error_state_buf *m,
 367                                 const char *prefix,
 368                                 struct drm_i915_error_request *erq)
 369 {
 370         if (!erq->seqno)
 371                 return;
 372
 373         err_printf(m, "%s pid %d, seqno %8x:%08x, emitted %dms ago, head %08x, tail %08x\n",
 374                    prefix, erq->pid,
 375                    erq->context, erq->seqno,
 376                    jiffies_to_msecs(jiffies - erq->jiffies),
 377                    erq->head, erq->tail);
 378 }
 379
 380 static void error_print_engine(struct drm_i915_error_state_buf *m,
 381                                struct drm_i915_error_engine *ee)
 382 {
 383         err_printf(m, "%s command stream:\n", engine_str(ee->engine_id));
 384         err_printf(m, "  START: 0x%08x\n", ee->start);
 385         err_printf(m, "  HEAD:  0x%08x [0x%08x]\n", ee->head, ee->rq_head);
 386         err_printf(m, "  TAIL:  0x%08x [0x%08x, 0x%08x]\n",
 387                    ee->tail, ee->rq_post, ee->rq_tail);
 388         err_printf(m, "  CTL:   0x%08x\n", ee->ctl);
 389         err_printf(m, "  MODE:  0x%08x\n", ee->mode);
 390         err_printf(m, "  HWS:   0x%08x\n", ee->hws);
 391         err_printf(m, "  ACTHD: 0x%08x %08x\n",
 392                    (u32)(ee->acthd>>32), (u32)ee->acthd);
 393         err_printf(m, "  IPEIR: 0x%08x\n", ee->ipeir);
 394         err_printf(m, "  IPEHR: 0x%08x\n", ee->ipehr);
 395
 396         error_print_instdone(m, ee);
 397
 398         if (ee->batchbuffer) {
 399                 u64 start = ee->batchbuffer->gtt_offset;
 400                 u64 end = start + ee->batchbuffer->gtt_size;
 401
 402                 err_printf(m, "  batch: [0x%08x_%08x, 0x%08x_%08x]\n",
 403                            upper_32_bits(start), lower_32_bits(start),
 404                            upper_32_bits(end), lower_32_bits(end));
 405         }
 406         if (INTEL_GEN(m->i915) >= 4) {
 407                 err_printf(m, "  BBADDR: 0x%08x_%08x\n",
 408                            (u32)(ee->bbaddr>>32), (u32)ee->bbaddr);
 409                 err_printf(m, "  BB_STATE: 0x%08x\n", ee->bbstate);
 410                 err_printf(m, "  INSTPS: 0x%08x\n", ee->instps);
 411         }
 412         err_printf(m, "  INSTPM: 0x%08x\n", ee->instpm);
 413         err_printf(m, "  FADDR: 0x%08x %08x\n", upper_32_bits(ee->faddr),
 414                    lower_32_bits(ee->faddr));
 415         if (INTEL_GEN(m->i915) >= 6) {
 416                 err_printf(m, "  RC PSMI: 0x%08x\n", ee->rc_psmi);
 417                 err_printf(m, "  FAULT_REG: 0x%08x\n", ee->fault_reg);
 418                 err_printf(m, "  SYNC_0: 0x%08x\n",
 419                            ee->semaphore_mboxes[0]);
 420                 err_printf(m, "  SYNC_1: 0x%08x\n",
 421                            ee->semaphore_mboxes[1]);
 422                 if (HAS_VEBOX(m->i915))
 423                         err_printf(m, "  SYNC_2: 0x%08x\n",
 424                                    ee->semaphore_mboxes[2]);
 425         }
 426         if (USES_PPGTT(m->i915)) {
 427                 err_printf(m, "  GFX_MODE: 0x%08x\n", ee->vm_info.gfx_mode);
 428
 429                 if (INTEL_GEN(m->i915) >= 8) {
 430                         int i;
 431                         for (i = 0; i < 4; i++)
 432                                 err_printf(m, "  PDP%d: 0x%016llx\n",
 433                                            i, ee->vm_info.pdp[i]);
 434                 } else {
 435                         err_printf(m, "  PP_DIR_BASE: 0x%08x\n",
 436                                    ee->vm_info.pp_dir_base);
 437                 }
 438         }
 439         err_printf(m, "  seqno: 0x%08x\n", ee->seqno);
 440         err_printf(m, "  last_seqno: 0x%08x\n", ee->last_seqno);
 441         err_printf(m, "  waiting: %s\n", yesno(ee->waiting));
 442         err_printf(m, "  ring->head: 0x%08x\n", ee->cpu_ring_head);
 443         err_printf(m, "  ring->tail: 0x%08x\n", ee->cpu_ring_tail);
 444         err_printf(m, "  hangcheck: %s [%d]\n",
 445                    hangcheck_action_to_str(ee->hangcheck_action),
 446                    ee->hangcheck_score);
 447         error_print_request(m, "  ELSP[0]: ", &ee->execlist[0]);
 448         error_print_request(m, "  ELSP[1]: ", &ee->execlist[1]);
 449 }
 450
 451 void i915_error_printf(struct drm_i915_error_state_buf *e, const char *f, ...)
 452 {
 453         va_list args;
 454
 455         va_start(args, f);
 456         i915_error_vprintf(e, f, args);
 457         va_end(args);
 458 }
 459
 460 static int
 461 ascii85_encode_len(int len)
 462 {
 463         return DIV_ROUND_UP(len, 4);
 464 }
 465
 466 static bool
 467 ascii85_encode(u32 in, char *out)
 468 {
 469         int i;
 470
 471         if (in == 0)
 472                 return false;
 473
 474         out[5] = '\0';
 475         for (i = 5; i--; ) {
 476                 out[i] = '!' + in % 85;
 477                 in /= 85;
 478         }
 479
 480         return true;
 481 }
 482
 483 static void print_error_obj(struct drm_i915_error_state_buf *m,
 484                             struct intel_engine_cs *engine,
 485                             const char *name,
 486                             struct drm_i915_error_object *obj)
 487 {
 488         char out[6];
 489         int page;
 490
 491         if (!obj)
 492                 return;
 493
 494         if (name) {
 495                 err_printf(m, "%s --- %s = 0x%08x %08x\n",
 496                            engine ? engine->name : "global", name,
 497                            upper_32_bits(obj->gtt_offset),
 498                            lower_32_bits(obj->gtt_offset));
 499         }
 500
 501         err_compression_marker(m);
 502         for (page = 0; page < obj->page_count; page++) {
 503                 int i, len;
 504
 505                 len = PAGE_SIZE;
 506                 if (page == obj->page_count - 1)
 507                         len -= obj->unused;
 508                 len = ascii85_encode_len(len);
 509
 510                 for (i = 0; i < len; i++) {
 511                         if (ascii85_encode(obj->pages[page][i], out))
 512                                 err_puts(m, out);
 513                         else
 514                                 err_puts(m, "z");
 515                 }
 516         }
 517         err_puts(m, "\n");
 518 }
 519
 520 static void err_print_capabilities(struct drm_i915_error_state_buf *m,
 521                                    const struct intel_device_info *info)
 522 {
 523 #define PRINT_FLAG(x)  err_printf(m, #x ": %s\n", yesno(info->x))
 524         DEV_INFO_FOR_EACH_FLAG(PRINT_FLAG);
 525 #undef PRINT_FLAG
 526 }
 527
 528 int i915_error_state_to_str(struct drm_i915_error_state_buf *m,
 529                             const struct i915_error_state_file_priv *error_priv)
 530 {
 531         struct drm_i915_private *dev_priv = to_i915(error_priv->dev);
 532         struct pci_dev *pdev = dev_priv->drm.pdev;
 533         struct drm_i915_error_state *error = error_priv->error;
 534         struct drm_i915_error_object *obj;
 535         int max_hangcheck_score;
 536         int i, j;
 537
 538         if (!error) {
 539                 err_printf(m, "no error state collected\n");
 540                 goto out;
 541         }
 542
 543         err_printf(m, "%s\n", error->error_msg);
 544         err_printf(m, "Kernel: " UTS_RELEASE "\n");
 545         err_printf(m, "Time: %ld s %ld us\n",
 546                    error->time.tv_sec, error->time.tv_usec);
 547         err_printf(m, "Boottime: %ld s %ld us\n",
 548                    error->boottime.tv_sec, error->boottime.tv_usec);
 549         err_printf(m, "Uptime: %ld s %ld us\n",
 550                    error->uptime.tv_sec, error->uptime.tv_usec);
 551         err_print_capabilities(m, &error->device_info);
 552         max_hangcheck_score = 0;
 553         for (i = 0; i < ARRAY_SIZE(error->engine); i++) {
 554                 if (error->engine[i].hangcheck_score > max_hangcheck_score)
 555                         max_hangcheck_score = error->engine[i].hangcheck_score;
 556         }
 557         for (i = 0; i < ARRAY_SIZE(error->engine); i++) {
 558                 if (error->engine[i].hangcheck_score == max_hangcheck_score &&
 559                     error->engine[i].pid != -1) {
 560                         err_printf(m, "Active process (on ring %s): %s [%d]\n",
 561                                    engine_str(i),
 562                                    error->engine[i].comm,
 563                                    error->engine[i].pid);
 564                 }
 565         }
 566         err_printf(m, "Reset count: %u\n", error->reset_count);
 567         err_printf(m, "Suspend count: %u\n", error->suspend_count);
 568         err_printf(m, "PCI ID: 0x%04x\n", pdev->device);
 569         err_printf(m, "PCI Revision: 0x%02x\n", pdev->revision);
 570         err_printf(m, "PCI Subsystem: %04x:%04x\n",
 571                    pdev->subsystem_vendor,
 572                    pdev->subsystem_device);
 573         err_printf(m, "IOMMU enabled?: %d\n", error->iommu);
 574
 575         if (HAS_CSR(dev_priv)) {
 576                 struct intel_csr *csr = &dev_priv->csr;
 577
 578                 err_printf(m, "DMC loaded: %s\n",
 579                            yesno(csr->dmc_payload != NULL));
 580                 err_printf(m, "DMC fw version: %d.%d\n",
 581                            CSR_VERSION_MAJOR(csr->version),
 582                            CSR_VERSION_MINOR(csr->version));
 583         }
 584
 585         err_printf(m, "EIR: 0x%08x\n", error->eir);
 586         err_printf(m, "IER: 0x%08x\n", error->ier);
 587         if (INTEL_GEN(dev_priv) >= 8) {
 588                 for (i = 0; i < 4; i++)
 589                         err_printf(m, "GTIER gt %d: 0x%08x\n", i,
 590                                    error->gtier[i]);
 591         } else if (HAS_PCH_SPLIT(dev_priv) || IS_VALLEYVIEW(dev_priv))
 592                 err_printf(m, "GTIER: 0x%08x\n", error->gtier[0]);
 593         err_printf(m, "PGTBL_ER: 0x%08x\n", error->pgtbl_er);
 594         err_printf(m, "FORCEWAKE: 0x%08x\n", error->forcewake);
 595         err_printf(m, "DERRMR: 0x%08x\n", error->derrmr);
 596         err_printf(m, "CCID: 0x%08x\n", error->ccid);
 597         err_printf(m, "Missed interrupts: 0x%08lx\n", dev_priv->gpu_error.missed_irq_rings);
 598
 599         for (i = 0; i < dev_priv->num_fence_regs; i++)
 600                 err_printf(m, "  fence[%d] = %08llx\n", i, error->fence[i]);
 601
 602         if (INTEL_GEN(dev_priv) >= 6) {
 603                 err_printf(m, "ERROR: 0x%08x\n", error->error);
 604
 605                 if (INTEL_GEN(dev_priv) >= 8)
 606                         err_printf(m, "FAULT_TLB_DATA: 0x%08x 0x%08x\n",
 607                                    error->fault_data1, error->fault_data0);
 608
 609                 err_printf(m, "DONE_REG: 0x%08x\n", error->done_reg);
 610         }
 611
 612         if (IS_GEN7(dev_priv))
 613                 err_printf(m, "ERR_INT: 0x%08x\n", error->err_int);
 614
 615         for (i = 0; i < ARRAY_SIZE(error->engine); i++) {
 616                 if (error->engine[i].engine_id != -1)
 617                         error_print_engine(m, &error->engine[i]);
 618         }
 619
 620         for (i = 0; i < ARRAY_SIZE(error->active_vm); i++) {
 621                 char buf[128];
 622                 int len, first = 1;
 623
 624                 if (!error->active_vm[i])
 625                         break;
 626
 627                 len = scnprintf(buf, sizeof(buf), "Active (");
 628                 for (j = 0; j < ARRAY_SIZE(error->engine); j++) {
 629                         if (error->engine[j].vm != error->active_vm[i])
 630                                 continue;
 631
 632                         len += scnprintf(buf + len, sizeof(buf), "%s%s",
 633                                          first ? "" : ", ",
 634                                          dev_priv->engine[j]->name);
 635                         first = 0;
 636                 }
 637                 scnprintf(buf + len, sizeof(buf), ")");
 638                 print_error_buffers(m, buf,
 639                                     error->active_bo[i],
 640                                     error->active_bo_count[i]);
 641         }
 642
 643         print_error_buffers(m, "Pinned (global)",
 644                             error->pinned_bo,
 645                             error->pinned_bo_count);
 646
 647         for (i = 0; i < ARRAY_SIZE(error->engine); i++) {
 648                 struct drm_i915_error_engine *ee = &error->engine[i];
 649
 650                 obj = ee->batchbuffer;
 651                 if (obj) {
 652                         err_puts(m, dev_priv->engine[i]->name);
 653                         if (ee->pid != -1)
 654                                 err_printf(m, " (submitted by %s [%d])",
 655                                            ee->comm,
 656                                            ee->pid);
 657                         err_printf(m, " --- gtt_offset = 0x%08x %08x\n",
 658                                    upper_32_bits(obj->gtt_offset),
 659                                    lower_32_bits(obj->gtt_offset));
 660                         print_error_obj(m, dev_priv->engine[i], NULL, obj);
 661                 }
 662
 663                 if (ee->num_requests) {
 664                         err_printf(m, "%s --- %d requests\n",
 665                                    dev_priv->engine[i]->name,
 666                                    ee->num_requests);
 667                         for (j = 0; j < ee->num_requests; j++)
 668                                 error_print_request(m, " ", &ee->requests[j]);
 669                 }
 670
 671                 if (IS_ERR(ee->waiters)) {
 672                         err_printf(m, "%s --- ? waiters [unable to acquire spinlock]\n",
 673                                    dev_priv->engine[i]->name);
 674                 } else if (ee->num_waiters) {
 675                         err_printf(m, "%s --- %d waiters\n",
 676                                    dev_priv->engine[i]->name,
 677                                    ee->num_waiters);
 678                         for (j = 0; j < ee->num_waiters; j++) {
 679                                 err_printf(m, " seqno 0x%08x for %s [%d]\n",
 680                                            ee->waiters[j].seqno,
 681                                            ee->waiters[j].comm,
 682                                            ee->waiters[j].pid);
 683                         }
 684                 }
 685
 686                 print_error_obj(m, dev_priv->engine[i],
 687                                 "ringbuffer", ee->ringbuffer);
 688
 689                 print_error_obj(m, dev_priv->engine[i],
 690                                 "HW Status", ee->hws_page);
 691
 692                 print_error_obj(m, dev_priv->engine[i],
 693                                 "HW context", ee->ctx);
 694
 695                 print_error_obj(m, dev_priv->engine[i],
 696                                 "WA context", ee->wa_ctx);
 697
 698                 print_error_obj(m, dev_priv->engine[i],
 699                                 "WA batchbuffer", ee->wa_batchbuffer);
 700         }
 701
 702         print_error_obj(m, NULL, "Semaphores", error->semaphore);
 703
 704         print_error_obj(m, NULL, "GuC log buffer", error->guc_log);
 705
 706         if (error->overlay)
 707                 intel_overlay_print_error_state(m, error->overlay);
 708
 709         if (error->display)
 710                 intel_display_print_error_state(m, dev_priv, error->display);
 711
 712 out:
 713         if (m->bytes == 0 && m->err)
 714                 return m->err;
 715
 716         return 0;
 717 }
 718
 719 int i915_error_state_buf_init(struct drm_i915_error_state_buf *ebuf,
 720                               struct drm_i915_private *i915,
 721                               size_t count, loff_t pos)
 722 {
 723         memset(ebuf, 0, sizeof(*ebuf));
 724         ebuf->i915 = i915;
 725
 726         /* We need to have enough room to store any i915_error_state printf
 727          * so that we can move it to start position.
 728          */
 729         ebuf->size = count + 1 > PAGE_SIZE ? count + 1 : PAGE_SIZE;
 730         ebuf->buf = kmalloc(ebuf->size,
 731                                 GFP_TEMPORARY | __GFP_NORETRY | __GFP_NOWARN);
 732
 733         if (ebuf->buf == NULL) {
 734                 ebuf->size = PAGE_SIZE;
 735                 ebuf->buf = kmalloc(ebuf->size, GFP_TEMPORARY);
 736         }
 737
 738         if (ebuf->buf == NULL) {
 739                 ebuf->size = 128;
 740                 ebuf->buf = kmalloc(ebuf->size, GFP_TEMPORARY);
 741         }
 742
 743         if (ebuf->buf == NULL)
 744                 return -ENOMEM;
 745
 746         ebuf->start = pos;
 747
 748         return 0;
 749 }
 750
 751 static void i915_error_object_free(struct drm_i915_error_object *obj)
 752 {
 753         int page;
 754
 755         if (obj == NULL)
 756                 return;
 757
 758         for (page = 0; page < obj->page_count; page++)
 759                 free_page((unsigned long)obj->pages[page]);
 760
 761         kfree(obj);
 762 }
 763
 764 static void i915_error_state_free(struct kref *error_ref)
 765 {
 766         struct drm_i915_error_state *error = container_of(error_ref,
 767                                                           typeof(*error), ref);
 768         int i;
 769
 770         for (i = 0; i < ARRAY_SIZE(error->engine); i++) {
 771                 struct drm_i915_error_engine *ee = &error->engine[i];
 772
 773                 i915_error_object_free(ee->batchbuffer);
 774                 i915_error_object_free(ee->wa_batchbuffer);
 775                 i915_error_object_free(ee->ringbuffer);
 776                 i915_error_object_free(ee->hws_page);
 777                 i915_error_object_free(ee->ctx);
 778                 i915_error_object_free(ee->wa_ctx);
 779
 780                 kfree(ee->requests);
 781                 if (!IS_ERR_OR_NULL(ee->waiters))
 782                         kfree(ee->waiters);
 783         }
 784
 785         i915_error_object_free(error->semaphore);
 786         i915_error_object_free(error->guc_log);
 787
 788         for (i = 0; i < ARRAY_SIZE(error->active_bo); i++)
 789                 kfree(error->active_bo[i]);
 790         kfree(error->pinned_bo);
 791
 792         kfree(error->overlay);
 793         kfree(error->display);
 794         kfree(error);
 795 }
 796
 797 static struct drm_i915_error_object *
 798 i915_error_object_create(struct drm_i915_private *i915,
 799                          struct i915_vma *vma)
 800 {
 801         struct i915_ggtt *ggtt = &i915->ggtt;
 802         const u64 slot = ggtt->error_capture.start;
 803         struct drm_i915_error_object *dst;
 804         struct z_stream_s zstream;
 805         unsigned long num_pages;
 806         struct sgt_iter iter;
 807         dma_addr_t dma;
 808
 809         if (!vma)
 810                 return NULL;
 811
 812         num_pages = min_t(u64, vma->size, vma->obj->base.size) >> PAGE_SHIFT;
 813         num_pages = DIV_ROUND_UP(10 * num_pages, 8); /* worstcase zlib growth */
 814         dst = kmalloc(sizeof(*dst) + num_pages * sizeof(u32 *),
 815                       GFP_ATOMIC | __GFP_NOWARN);
 816         if (!dst)
 817                 return NULL;
 818
 819         dst->gtt_offset = vma->node.start;
 820         dst->gtt_size = vma->node.size;
 821         dst->page_count = 0;
 822         dst->unused = 0;
 823
 824         if (!compress_init(&zstream)) {
 825                 kfree(dst);
 826                 return NULL;
 827         }
 828
 829         for_each_sgt_dma(dma, iter, vma->pages) {
 830                 void __iomem *s;
 831                 int ret;
 832
 833                 ggtt->base.insert_page(&ggtt->base, dma, slot,
 834                                        I915_CACHE_NONE, 0);
 835
 836                 s = io_mapping_map_atomic_wc(&ggtt->mappable, slot);
 837                 ret = compress_page(&zstream, (void  __force *)s, dst);
 838                 io_mapping_unmap_atomic(s);
 839
 840                 if (ret)
 841                         goto unwind;
 842         }
 843         goto out;
 844
 845 unwind:
 846         while (dst->page_count--)
 847                 free_page((unsigned long)dst->pages[dst->page_count]);
 848         kfree(dst);
 849         dst = NULL;
 850
 851 out:
 852         compress_fini(&zstream, dst);
 853         ggtt->base.clear_range(&ggtt->base, slot, PAGE_SIZE);
 854         return dst;
 855 }
 856
 857 /* The error capture is special as tries to run underneath the normal
 858  * locking rules - so we use the raw version of the i915_gem_active lookup.
 859  */
 860 static inline uint32_t
 861 __active_get_seqno(struct i915_gem_active *active)
 862 {
 863         struct drm_i915_gem_request *request;
 864
 865         request = __i915_gem_active_peek(active);
 866         return request ? request->global_seqno : 0;
 867 }
 868
 869 static inline int
 870 __active_get_engine_id(struct i915_gem_active *active)
 871 {
 872         struct drm_i915_gem_request *request;
 873
 874         request = __i915_gem_active_peek(active);
 875         return request ? request->engine->id : -1;
 876 }
 877
 878 static void capture_bo(struct drm_i915_error_buffer *err,
 879                        struct i915_vma *vma)
 880 {
 881         struct drm_i915_gem_object *obj = vma->obj;
 882         int i;
 883
 884         err->size = obj->base.size;
 885         err->name = obj->base.name;
 886
 887         for (i = 0; i < I915_NUM_ENGINES; i++)
 888                 err->rseqno[i] = __active_get_seqno(&vma->last_read[i]);
 889         err->wseqno = __active_get_seqno(&obj->frontbuffer_write);
 890         err->engine = __active_get_engine_id(&obj->frontbuffer_write);
 891
 892         err->gtt_offset = vma->node.start;
 893         err->read_domains = obj->base.read_domains;
 894         err->write_domain = obj->base.write_domain;
 895         err->fence_reg = vma->fence ? vma->fence->id : -1;
 896         err->tiling = i915_gem_object_get_tiling(obj);
 897         err->dirty = obj->mm.dirty;
 898         err->purgeable = obj->mm.madv != I915_MADV_WILLNEED;
 899         err->userptr = obj->userptr.mm != NULL;
 900         err->cache_level = obj->cache_level;
 901 }
 902
 903 static u32 capture_error_bo(struct drm_i915_error_buffer *err,
 904                             int count, struct list_head *head,
 905                             bool pinned_only)
 906 {
 907         struct i915_vma *vma;
 908         int i = 0;
 909
 910         list_for_each_entry(vma, head, vm_link) {
 911                 if (pinned_only && !i915_vma_is_pinned(vma))
 912                         continue;
 913
 914                 capture_bo(err++, vma);
 915                 if (++i == count)
 916                         break;
 917         }
 918
 919         return i;
 920 }
 921
 922 /* Generate a semi-unique error code. The code is not meant to have meaning, The
 923  * code's only purpose is to try to prevent false duplicated bug reports by
 924  * grossly estimating a GPU error state.
 925  *
 926  * TODO Ideally, hashing the batchbuffer would be a very nice way to determine
 927  * the hang if we could strip the GTT offset information from it.
 928  *
 929  * It's only a small step better than a random number in its current form.
 930  */
 931 static uint32_t i915_error_generate_code(struct drm_i915_private *dev_priv,
 932                                          struct drm_i915_error_state *error,
 933                                          int *engine_id)
 934 {
 935         uint32_t error_code = 0;
 936         int i;
 937
 938         /* IPEHR would be an ideal way to detect errors, as it's the gross
 939          * measure of "the command that hung." However, has some very common
 940          * synchronization commands which almost always appear in the case
 941          * strictly a client bug. Use instdone to differentiate those some.
 942          */
 943         for (i = 0; i < I915_NUM_ENGINES; i++) {
 944                 if (error->engine[i].hangcheck_action == HANGCHECK_HUNG) {
 945                         if (engine_id)
 946                                 *engine_id = i;
 947
 948                         return error->engine[i].ipehr ^
 949                                error->engine[i].instdone.instdone;
 950                 }
 951         }
 952
 953         return error_code;
 954 }
 955
 956 static void i915_gem_record_fences(struct drm_i915_private *dev_priv,
 957                                    struct drm_i915_error_state *error)
 958 {
 959         int i;
 960
 961         if (IS_GEN3(dev_priv) || IS_GEN2(dev_priv)) {
 962                 for (i = 0; i < dev_priv->num_fence_regs; i++)
 963                         error->fence[i] = I915_READ(FENCE_REG(i));
 964         } else if (IS_GEN5(dev_priv) || IS_GEN4(dev_priv)) {
 965                 for (i = 0; i < dev_priv->num_fence_regs; i++)
 966                         error->fence[i] = I915_READ64(FENCE_REG_965_LO(i));
 967         } else if (INTEL_GEN(dev_priv) >= 6) {
 968                 for (i = 0; i < dev_priv->num_fence_regs; i++)
 969                         error->fence[i] = I915_READ64(FENCE_REG_GEN6_LO(i));
 970         }
 971 }
 972
 973 static inline u32
 974 gen8_engine_sync_index(struct intel_engine_cs *engine,
 975                        struct intel_engine_cs *other)
 976 {
 977         int idx;
 978
 979         /*
 980          * rcs -> 0 = vcs, 1 = bcs, 2 = vecs, 3 = vcs2;
 981          * vcs -> 0 = bcs, 1 = vecs, 2 = vcs2, 3 = rcs;
 982          * bcs -> 0 = vecs, 1 = vcs2. 2 = rcs, 3 = vcs;
 983          * vecs -> 0 = vcs2, 1 = rcs, 2 = vcs, 3 = bcs;
 984          * vcs2 -> 0 = rcs, 1 = vcs, 2 = bcs, 3 = vecs;
 985          */
 986
 987         idx = (other - engine) - 1;
 988         if (idx < 0)
 989                 idx += I915_NUM_ENGINES;
 990
 991         return idx;
 992 }
 993
 994 static void gen8_record_semaphore_state(struct drm_i915_error_state *error,
 995                                         struct intel_engine_cs *engine,
 996                                         struct drm_i915_error_engine *ee)
 997 {
 998         struct drm_i915_private *dev_priv = engine->i915;
 999         struct intel_engine_cs *to;
1000         enum intel_engine_id id;
1001
1002         if (!error->semaphore)
1003                 return;
1004
1005         for_each_engine(to, dev_priv, id) {
1006                 int idx;
1007                 u16 signal_offset;
1008                 u32 *tmp;
1009
1010                 if (engine == to)
1011                         continue;
1012
1013                 signal_offset =
1014                         (GEN8_SIGNAL_OFFSET(engine, id) & (PAGE_SIZE - 1)) / 4;
1015                 tmp = error->semaphore->pages[0];
1016                 idx = gen8_engine_sync_index(engine, to);
1017
1018                 ee->semaphore_mboxes[idx] = tmp[signal_offset];
1019         }
1020 }
1021
1022 static void gen6_record_semaphore_state(struct intel_engine_cs *engine,
1023                                         struct drm_i915_error_engine *ee)
1024 {
1025         struct drm_i915_private *dev_priv = engine->i915;
1026
1027         ee->semaphore_mboxes[0] = I915_READ(RING_SYNC_0(engine->mmio_base));
1028         ee->semaphore_mboxes[1] = I915_READ(RING_SYNC_1(engine->mmio_base));
1029         if (HAS_VEBOX(dev_priv))
1030                 ee->semaphore_mboxes[2] =
1031                         I915_READ(RING_SYNC_2(engine->mmio_base));
1032 }
1033
1034 static void error_record_engine_waiters(struct intel_engine_cs *engine,
1035                                         struct drm_i915_error_engine *ee)
1036 {
1037         struct intel_breadcrumbs *b = &engine->breadcrumbs;
1038         struct drm_i915_error_waiter *waiter;
1039         struct rb_node *rb;
1040         int count;
1041
1042         ee->num_waiters = 0;
1043         ee->waiters = NULL;
1044
1045         if (RB_EMPTY_ROOT(&b->waiters))
1046                 return;
1047
1048         if (!spin_trylock_irq(&b->lock)) {
1049                 ee->waiters = ERR_PTR(-EDEADLK);
1050                 return;
1051         }
1052
1053         count = 0;
1054         for (rb = rb_first(&b->waiters); rb != NULL; rb = rb_next(rb))
1055                 count++;
1056         spin_unlock_irq(&b->lock);
1057
1058         waiter = NULL;
1059         if (count)
1060                 waiter = kmalloc_array(count,
1061                                        sizeof(struct drm_i915_error_waiter),
1062                                        GFP_ATOMIC);
1063         if (!waiter)
1064                 return;
1065
1066         if (!spin_trylock_irq(&b->lock)) {
1067                 kfree(waiter);
1068                 ee->waiters = ERR_PTR(-EDEADLK);
1069                 return;
1070         }
1071
1072         ee->waiters = waiter;
1073         for (rb = rb_first(&b->waiters); rb; rb = rb_next(rb)) {
1074                 struct intel_wait *w = container_of(rb, typeof(*w), node);
1075
1076                 strcpy(waiter->comm, w->tsk->comm);
1077                 waiter->pid = w->tsk->pid;
1078                 waiter->seqno = w->seqno;
1079                 waiter++;
1080
1081                 if (++ee->num_waiters == count)
1082                         break;
1083         }
1084         spin_unlock_irq(&b->lock);
1085 }
1086
1087 static void error_record_engine_registers(struct drm_i915_error_state *error,
1088                                           struct intel_engine_cs *engine,
1089                                           struct drm_i915_error_engine *ee)
1090 {
1091         struct drm_i915_private *dev_priv = engine->i915;
1092
1093         if (INTEL_GEN(dev_priv) >= 6) {
1094                 ee->rc_psmi = I915_READ(RING_PSMI_CTL(engine->mmio_base));
1095                 ee->fault_reg = I915_READ(RING_FAULT_REG(engine));
1096                 if (INTEL_GEN(dev_priv) >= 8)
1097                         gen8_record_semaphore_state(error, engine, ee);
1098                 else
1099                         gen6_record_semaphore_state(engine, ee);
1100         }
1101
1102         if (INTEL_GEN(dev_priv) >= 4) {
1103                 ee->faddr = I915_READ(RING_DMA_FADD(engine->mmio_base));
1104                 ee->ipeir = I915_READ(RING_IPEIR(engine->mmio_base));
1105                 ee->ipehr = I915_READ(RING_IPEHR(engine->mmio_base));
1106                 ee->instps = I915_READ(RING_INSTPS(engine->mmio_base));
1107                 ee->bbaddr = I915_READ(RING_BBADDR(engine->mmio_base));
1108                 if (INTEL_GEN(dev_priv) >= 8) {
1109                         ee->faddr |= (u64) I915_READ(RING_DMA_FADD_UDW(engine->mmio_base)) << 32;
1110                         ee->bbaddr |= (u64) I915_READ(RING_BBADDR_UDW(engine->mmio_base)) << 32;
1111                 }
1112                 ee->bbstate = I915_READ(RING_BBSTATE(engine->mmio_base));
1113         } else {
1114                 ee->faddr = I915_READ(DMA_FADD_I8XX);
1115                 ee->ipeir = I915_READ(IPEIR);
1116                 ee->ipehr = I915_READ(IPEHR);
1117         }
1118
1119         intel_engine_get_instdone(engine, &ee->instdone);
1120
1121         ee->waiting = intel_engine_has_waiter(engine);
1122         ee->instpm = I915_READ(RING_INSTPM(engine->mmio_base));
1123         ee->acthd = intel_engine_get_active_head(engine);
1124         ee->seqno = intel_engine_get_seqno(engine);
1125         ee->last_seqno = intel_engine_last_submit(engine);
1126         ee->start = I915_READ_START(engine);
1127         ee->head = I915_READ_HEAD(engine);
1128         ee->tail = I915_READ_TAIL(engine);
1129         ee->ctl = I915_READ_CTL(engine);
1130         if (INTEL_GEN(dev_priv) > 2)
1131                 ee->mode = I915_READ_MODE(engine);
1132
1133         if (!HWS_NEEDS_PHYSICAL(dev_priv)) {
1134                 i915_reg_t mmio;
1135
1136                 if (IS_GEN7(dev_priv)) {
1137                         switch (engine->id) {
1138                         default:
1139                         case RCS:
1140                                 mmio = RENDER_HWS_PGA_GEN7;
1141                                 break;
1142                         case BCS:
1143                                 mmio = BLT_HWS_PGA_GEN7;
1144                                 break;
1145                         case VCS:
1146                                 mmio = BSD_HWS_PGA_GEN7;
1147                                 break;
1148                         case VECS:
1149                                 mmio = VEBOX_HWS_PGA_GEN7;
1150                                 break;
1151                         }
1152                 } else if (IS_GEN6(engine->i915)) {
1153                         mmio = RING_HWS_PGA_GEN6(engine->mmio_base);
1154                 } else {
1155                         /* XXX: gen8 returns to sanity */
1156                         mmio = RING_HWS_PGA(engine->mmio_base);
1157                 }
1158
1159                 ee->hws = I915_READ(mmio);
1160         }
1161
1162         ee->hangcheck_score = engine->hangcheck.score;
1163         ee->hangcheck_action = engine->hangcheck.action;
1164
1165         if (USES_PPGTT(dev_priv)) {
1166                 int i;
1167
1168                 ee->vm_info.gfx_mode = I915_READ(RING_MODE_GEN7(engine));
1169
1170                 if (IS_GEN6(dev_priv))
1171                         ee->vm_info.pp_dir_base =
1172                                 I915_READ(RING_PP_DIR_BASE_READ(engine));
1173                 else if (IS_GEN7(dev_priv))
1174                         ee->vm_info.pp_dir_base =
1175                                 I915_READ(RING_PP_DIR_BASE(engine));
1176                 else if (INTEL_GEN(dev_priv) >= 8)
1177                         for (i = 0; i < 4; i++) {
1178                                 ee->vm_info.pdp[i] =
1179                                         I915_READ(GEN8_RING_PDP_UDW(engine, i));
1180                                 ee->vm_info.pdp[i] <<= 32;
1181                                 ee->vm_info.pdp[i] |=
1182                                         I915_READ(GEN8_RING_PDP_LDW(engine, i));
1183                         }
1184         }
1185 }
1186
1187 static void record_request(struct drm_i915_gem_request *request,
1188                            struct drm_i915_error_request *erq)
1189 {
1190         erq->context = request->ctx->hw_id;
1191         erq->seqno = request->global_seqno;
1192         erq->jiffies = request->emitted_jiffies;
1193         erq->head = request->head;
1194         erq->tail = request->tail;
1195
1196         rcu_read_lock();
1197         erq->pid = request->ctx->pid ? pid_nr(request->ctx->pid) : 0;
1198         rcu_read_unlock();
1199 }
1200
1201 static void engine_record_requests(struct intel_engine_cs *engine,
1202                                    struct drm_i915_gem_request *first,
1203                                    struct drm_i915_error_engine *ee)
1204 {
1205         struct drm_i915_gem_request *request;
1206         int count;
1207
1208         count = 0;
1209         request = first;
1210         list_for_each_entry_from(request, &engine->timeline->requests, link)
1211                 count++;
1212         if (!count)
1213                 return;
1214
1215         ee->requests = kcalloc(count, sizeof(*ee->requests), GFP_ATOMIC);
1216         if (!ee->requests)
1217                 return;
1218
1219         ee->num_requests = count;
1220
1221         count = 0;
1222         request = first;
1223         list_for_each_entry_from(request, &engine->timeline->requests, link) {
1224                 if (count >= ee->num_requests) {
1225                         /*
1226                          * If the ring request list was changed in
1227                          * between the point where the error request
1228                          * list was created and dimensioned and this
1229                          * point then just exit early to avoid crashes.
1230                          *
1231                          * We don't need to communicate that the
1232                          * request list changed state during error
1233                          * state capture and that the error state is
1234                          * slightly incorrect as a consequence since we
1235                          * are typically only interested in the request
1236                          * list state at the point of error state
1237                          * capture, not in any changes happening during
1238                          * the capture.
1239                          */
1240                         break;
1241                 }
1242
1243                 record_request(request, &ee->requests[count++]);
1244         }
1245         ee->num_requests = count;
1246 }
1247
1248 static void error_record_engine_execlists(struct intel_engine_cs *engine,
1249                                           struct drm_i915_error_engine *ee)
1250 {
1251         unsigned int n;
1252
1253         for (n = 0; n < ARRAY_SIZE(engine->execlist_port); n++)
1254                 if (engine->execlist_port[n].request)
1255                         record_request(engine->execlist_port[n].request,
1256                                        &ee->execlist[n]);
1257 }
1258
1259 static void i915_gem_record_rings(struct drm_i915_private *dev_priv,
1260                                   struct drm_i915_error_state *error)
1261 {
1262         struct i915_ggtt *ggtt = &dev_priv->ggtt;
1263         int i;
1264
1265         error->semaphore =
1266                 i915_error_object_create(dev_priv, dev_priv->semaphore);
1267
1268         for (i = 0; i < I915_NUM_ENGINES; i++) {
1269                 struct intel_engine_cs *engine = dev_priv->engine[i];
1270                 struct drm_i915_error_engine *ee = &error->engine[i];
1271                 struct drm_i915_gem_request *request;
1272
1273                 ee->pid = -1;
1274                 ee->engine_id = -1;
1275
1276                 if (!engine)
1277                         continue;
1278
1279                 ee->engine_id = i;
1280
1281                 error_record_engine_registers(error, engine, ee);
1282                 error_record_engine_waiters(engine, ee);
1283                 error_record_engine_execlists(engine, ee);
1284
1285                 request = i915_gem_find_active_request(engine);
1286                 if (request) {
1287                         struct intel_ring *ring;
1288                         struct pid *pid;
1289
1290                         ee->vm = request->ctx->ppgtt ?
1291                                 &request->ctx->ppgtt->base : &ggtt->base;
1292
1293                         /* We need to copy these to an anonymous buffer
1294                          * as the simplest method to avoid being overwritten
1295                          * by userspace.
1296                          */
1297                         ee->batchbuffer =
1298                                 i915_error_object_create(dev_priv,
1299                                                          request->batch);
1300
1301                         if (HAS_BROKEN_CS_TLB(dev_priv))
1302                                 ee->wa_batchbuffer =
1303                                         i915_error_object_create(dev_priv,
1304                                                                  engine->scratch);
1305
1306                         ee->ctx =
1307                                 i915_error_object_create(dev_priv,
1308                                                          request->ctx->engine[i].state);
1309
1310                         pid = request->ctx->pid;
1311                         if (pid) {
1312                                 struct task_struct *task;
1313
1314                                 rcu_read_lock();
1315                                 task = pid_task(pid, PIDTYPE_PID);
1316                                 if (task) {
1317                                         strcpy(ee->comm, task->comm);
1318                                         ee->pid = task->pid;
1319                                 }
1320                                 rcu_read_unlock();
1321                         }
1322
1323                         error->simulated |=
1324                                 request->ctx->flags & CONTEXT_NO_ERROR_CAPTURE;
1325
1326                         ee->rq_head = request->head;
1327                         ee->rq_post = request->postfix;
1328                         ee->rq_tail = request->tail;
1329
1330                         ring = request->ring;
1331                         ee->cpu_ring_head = ring->head;
1332                         ee->cpu_ring_tail = ring->tail;
1333                         ee->ringbuffer =
1334                                 i915_error_object_create(dev_priv, ring->vma);
1335
1336                         engine_record_requests(engine, request, ee);
1337                 }
1338
1339                 ee->hws_page =
1340                         i915_error_object_create(dev_priv,
1341                                                  engine->status_page.vma);
1342
1343                 ee->wa_ctx =
1344                         i915_error_object_create(dev_priv, engine->wa_ctx.vma);
1345         }
1346 }
1347
1348 static void i915_gem_capture_vm(struct drm_i915_private *dev_priv,
1349                                 struct drm_i915_error_state *error,
1350                                 struct i915_address_space *vm,
1351                                 int idx)
1352 {
1353         struct drm_i915_error_buffer *active_bo;
1354         struct i915_vma *vma;
1355         int count;
1356
1357         count = 0;
1358         list_for_each_entry(vma, &vm->active_list, vm_link)
1359                 count++;
1360
1361         active_bo = NULL;
1362         if (count)
1363                 active_bo = kcalloc(count, sizeof(*active_bo), GFP_ATOMIC);
1364         if (active_bo)
1365                 count = capture_error_bo(active_bo, count, &vm->active_list, false);
1366         else
1367                 count = 0;
1368
1369         error->active_vm[idx] = vm;
1370         error->active_bo[idx] = active_bo;
1371         error->active_bo_count[idx] = count;
1372 }
1373
1374 static void i915_capture_active_buffers(struct drm_i915_private *dev_priv,
1375                                         struct drm_i915_error_state *error)
1376 {
1377         int cnt = 0, i, j;
1378
1379         BUILD_BUG_ON(ARRAY_SIZE(error->engine) > ARRAY_SIZE(error->active_bo));
1380         BUILD_BUG_ON(ARRAY_SIZE(error->active_bo) != ARRAY_SIZE(error->active_vm));
1381         BUILD_BUG_ON(ARRAY_SIZE(error->active_bo) != ARRAY_SIZE(error->active_bo_count));
1382
1383         /* Scan each engine looking for unique active contexts/vm */
1384         for (i = 0; i < ARRAY_SIZE(error->engine); i++) {
1385                 struct drm_i915_error_engine *ee = &error->engine[i];
1386                 bool found;
1387
1388                 if (!ee->vm)
1389                         continue;
1390
1391                 found = false;
1392                 for (j = 0; j < i && !found; j++)
1393                         found = error->engine[j].vm == ee->vm;
1394                 if (!found)
1395                         i915_gem_capture_vm(dev_priv, error, ee->vm, cnt++);
1396         }
1397 }
1398
1399 static void i915_capture_pinned_buffers(struct drm_i915_private *dev_priv,
1400                                         struct drm_i915_error_state *error)
1401 {
1402         struct i915_address_space *vm = &dev_priv->ggtt.base;
1403         struct drm_i915_error_buffer *bo;
1404         struct i915_vma *vma;
1405         int count_inactive, count_active;
1406
1407         count_inactive = 0;
1408         list_for_each_entry(vma, &vm->active_list, vm_link)
1409                 count_inactive++;
1410
1411         count_active = 0;
1412         list_for_each_entry(vma, &vm->inactive_list, vm_link)
1413                 count_active++;
1414
1415         bo = NULL;
1416         if (count_inactive + count_active)
1417                 bo = kcalloc(count_inactive + count_active,
1418                              sizeof(*bo), GFP_ATOMIC);
1419         if (!bo)
1420                 return;
1421
1422         count_inactive = capture_error_bo(bo, count_inactive,
1423                                           &vm->active_list, true);
1424         count_active = capture_error_bo(bo + count_inactive, count_active,
1425                                         &vm->inactive_list, true);
1426         error->pinned_bo_count = count_inactive + count_active;
1427         error->pinned_bo = bo;
1428 }
1429
1430 static void i915_gem_capture_guc_log_buffer(struct drm_i915_private *dev_priv,
1431                                             struct drm_i915_error_state *error)
1432 {
1433         /* Capturing log buf contents won't be useful if logging was disabled */
1434         if (!dev_priv->guc.log.vma || (i915.guc_log_level < 0))
1435                 return;
1436
1437         error->guc_log = i915_error_object_create(dev_priv,
1438                                                   dev_priv->guc.log.vma);
1439 }
1440
1441 /* Capture all registers which don't fit into another category. */
1442 static void i915_capture_reg_state(struct drm_i915_private *dev_priv,
1443                                    struct drm_i915_error_state *error)
1444 {
1445         int i;
1446
1447         /* General organization
1448          * 1. Registers specific to a single generation
1449          * 2. Registers which belong to multiple generations
1450          * 3. Feature specific registers.
1451          * 4. Everything else
1452          * Please try to follow the order.
1453          */
1454
1455         /* 1: Registers specific to a single generation */
1456         if (IS_VALLEYVIEW(dev_priv)) {
1457                 error->gtier[0] = I915_READ(GTIER);
1458                 error->ier = I915_READ(VLV_IER);
1459                 error->forcewake = I915_READ_FW(FORCEWAKE_VLV);
1460         }
1461
1462         if (IS_GEN7(dev_priv))
1463                 error->err_int = I915_READ(GEN7_ERR_INT);
1464
1465         if (INTEL_GEN(dev_priv) >= 8) {
1466                 error->fault_data0 = I915_READ(GEN8_FAULT_TLB_DATA0);
1467                 error->fault_data1 = I915_READ(GEN8_FAULT_TLB_DATA1);
1468         }
1469
1470         if (IS_GEN6(dev_priv)) {
1471                 error->forcewake = I915_READ_FW(FORCEWAKE);
1472                 error->gab_ctl = I915_READ(GAB_CTL);
1473                 error->gfx_mode = I915_READ(GFX_MODE);
1474         }
1475
1476         /* 2: Registers which belong to multiple generations */
1477         if (INTEL_GEN(dev_priv) >= 7)
1478                 error->forcewake = I915_READ_FW(FORCEWAKE_MT);
1479
1480         if (INTEL_GEN(dev_priv) >= 6) {
1481                 error->derrmr = I915_READ(DERRMR);
1482                 error->error = I915_READ(ERROR_GEN6);
1483                 error->done_reg = I915_READ(DONE_REG);
1484         }
1485
1486         /* 3: Feature specific registers */
1487         if (IS_GEN6(dev_priv) || IS_GEN7(dev_priv)) {
1488                 error->gam_ecochk = I915_READ(GAM_ECOCHK);
1489                 error->gac_eco = I915_READ(GAC_ECO_BITS);
1490         }
1491
1492         /* 4: Everything else */
1493         if (HAS_HW_CONTEXTS(dev_priv))
1494                 error->ccid = I915_READ(CCID);
1495
1496         if (INTEL_GEN(dev_priv) >= 8) {
1497                 error->ier = I915_READ(GEN8_DE_MISC_IER);
1498                 for (i = 0; i < 4; i++)
1499                         error->gtier[i] = I915_READ(GEN8_GT_IER(i));
1500         } else if (HAS_PCH_SPLIT(dev_priv)) {
1501                 error->ier = I915_READ(DEIER);
1502                 error->gtier[0] = I915_READ(GTIER);
1503         } else if (IS_GEN2(dev_priv)) {
1504                 error->ier = I915_READ16(IER);
1505         } else if (!IS_VALLEYVIEW(dev_priv)) {
1506                 error->ier = I915_READ(IER);
1507         }
1508         error->eir = I915_READ(EIR);
1509         error->pgtbl_er = I915_READ(PGTBL_ER);
1510 }
1511
1512 static void i915_error_capture_msg(struct drm_i915_private *dev_priv,
1513                                    struct drm_i915_error_state *error,
1514                                    u32 engine_mask,
1515                                    const char *error_msg)
1516 {
1517         u32 ecode;
1518         int engine_id = -1, len;
1519
1520         ecode = i915_error_generate_code(dev_priv, error, &engine_id);
1521
1522         len = scnprintf(error->error_msg, sizeof(error->error_msg),
1523                         "GPU HANG: ecode %d:%d:0x%08x",
1524                         INTEL_GEN(dev_priv), engine_id, ecode);
1525
1526         if (engine_id != -1 && error->engine[engine_id].pid != -1)
1527                 len += scnprintf(error->error_msg + len,
1528                                  sizeof(error->error_msg) - len,
1529                                  ", in %s [%d]",
1530                                  error->engine[engine_id].comm,
1531                                  error->engine[engine_id].pid);
1532
1533         scnprintf(error->error_msg + len, sizeof(error->error_msg) - len,
1534                   ", reason: %s, action: %s",
1535                   error_msg,
1536                   engine_mask ? "reset" : "continue");
1537 }
1538
1539 static void i915_capture_gen_state(struct drm_i915_private *dev_priv,
1540                                    struct drm_i915_error_state *error)
1541 {
1542         error->iommu = -1;
1543 #ifdef CONFIG_INTEL_IOMMU
1544         error->iommu = intel_iommu_gfx_mapped;
1545 #endif
1546         error->reset_count = i915_reset_count(&dev_priv->gpu_error);
1547         error->suspend_count = dev_priv->suspend_count;
1548
1549         memcpy(&error->device_info,
1550                INTEL_INFO(dev_priv),
1551                sizeof(error->device_info));
1552 }
1553
1554 static int capture(void *data)
1555 {
1556         struct drm_i915_error_state *error = data;
1557
1558         i915_capture_gen_state(error->i915, error);
1559         i915_capture_reg_state(error->i915, error);
1560         i915_gem_record_fences(error->i915, error);
1561         i915_gem_record_rings(error->i915, error);
1562         i915_capture_active_buffers(error->i915, error);
1563         i915_capture_pinned_buffers(error->i915, error);
1564         i915_gem_capture_guc_log_buffer(error->i915, error);
1565
1566         do_gettimeofday(&error->time);
1567         error->boottime = ktime_to_timeval(ktime_get_boottime());
1568         error->uptime =
1569                 ktime_to_timeval(ktime_sub(ktime_get(),
1570                                            error->i915->gt.last_init_time));
1571
1572         error->overlay = intel_overlay_capture_error_state(error->i915);
1573         error->display = intel_display_capture_error_state(error->i915);
1574
1575         return 0;
1576 }
1577
1578 #define DAY_AS_SECONDS(x) (24 * 60 * 60 * (x))
1579
1580 /**
1581  * i915_capture_error_state - capture an error record for later analysis
1582  * @dev: drm device
1583  *
1584  * Should be called when an error is detected (either a hang or an error
1585  * interrupt) to capture error state from the time of the error.  Fills
1586  * out a structure which becomes available in debugfs for user level tools
1587  * to pick up.
1588  */
1589 void i915_capture_error_state(struct drm_i915_private *dev_priv,
1590                               u32 engine_mask,
1591                               const char *error_msg)
1592 {
1593         static bool warned;
1594         struct drm_i915_error_state *error;
1595         unsigned long flags;
1596
1597         if (!i915.error_capture)
1598                 return;
1599
1600         if (READ_ONCE(dev_priv->gpu_error.first_error))
1601                 return;
1602
1603         /* Account for pipe specific data like PIPE*STAT */
1604         error = kzalloc(sizeof(*error), GFP_ATOMIC);
1605         if (!error) {
1606                 DRM_DEBUG_DRIVER("out of memory, not capturing error state\n");
1607                 return;
1608         }
1609
1610         kref_init(&error->ref);
1611         error->i915 = dev_priv;
1612
1613         stop_machine(capture, error, NULL);
1614
1615         i915_error_capture_msg(dev_priv, error, engine_mask, error_msg);
1616         DRM_INFO("%s\n", error->error_msg);
1617
1618         if (!error->simulated) {
1619                 spin_lock_irqsave(&dev_priv->gpu_error.lock, flags);
1620                 if (!dev_priv->gpu_error.first_error) {
1621                         dev_priv->gpu_error.first_error = error;
1622                         error = NULL;
1623                 }
1624                 spin_unlock_irqrestore(&dev_priv->gpu_error.lock, flags);
1625         }
1626
1627         if (error) {
1628                 i915_error_state_free(&error->ref);
1629                 return;
1630         }
1631
1632         if (!warned &&
1633             ktime_get_real_seconds() - DRIVER_TIMESTAMP < DAY_AS_SECONDS(180)) {
1634                 DRM_INFO("GPU hangs can indicate a bug anywhere in the entire gfx stack, including userspace.\n");
1635                 DRM_INFO("Please file a _new_ bug report on bugs.freedesktop.org against DRI -> DRM/Intel\n");
1636                 DRM_INFO("drm/i915 developers can then reassign to the right component if it's not a kernel issue.\n");
1637                 DRM_INFO("The gpu crash dump is required to analyze gpu hangs, so please always attach it.\n");
1638                 DRM_INFO("GPU crash dump saved to /sys/class/drm/card%d/error\n",
1639                          dev_priv->drm.primary->index);
1640                 warned = true;
1641         }
1642 }
1643
1644 void i915_error_state_get(struct drm_device *dev,
1645                           struct i915_error_state_file_priv *error_priv)
1646 {
1647         struct drm_i915_private *dev_priv = to_i915(dev);
1648
1649         spin_lock_irq(&dev_priv->gpu_error.lock);
1650         error_priv->error = dev_priv->gpu_error.first_error;
1651         if (error_priv->error)
1652                 kref_get(&error_priv->error->ref);
1653         spin_unlock_irq(&dev_priv->gpu_error.lock);
1654 }
1655
1656 void i915_error_state_put(struct i915_error_state_file_priv *error_priv)
1657 {
1658         if (error_priv->error)
1659                 kref_put(&error_priv->error->ref, i915_error_state_free);
1660 }
1661
1662 void i915_destroy_error_state(struct drm_device *dev)
1663 {
1664         struct drm_i915_private *dev_priv = to_i915(dev);
1665         struct drm_i915_error_state *error;
1666
1667         spin_lock_irq(&dev_priv->gpu_error.lock);
1668         error = dev_priv->gpu_error.first_error;
1669         dev_priv->gpu_error.first_error = NULL;
1670         spin_unlock_irq(&dev_priv->gpu_error.lock);
1671
1672         if (error)
1673                 kref_put(&error->ref, i915_error_state_free);
1674 }