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 <linux/ascii85.h>
  31 #include <linux/nmi.h>
  32 #include <linux/scatterlist.h>
  33 #include <linux/stop_machine.h>
  34 #include <linux/utsname.h>
  35 #include <linux/zlib.h>
  36
  37 #include <drm/drm_print.h>
  38
  39 #include "i915_gpu_error.h"
  40 #include "i915_drv.h"
  41
  42 static inline const struct intel_engine_cs *
  43 engine_lookup(const struct drm_i915_private *i915, unsigned int id)
  44 {
  45         if (id >= I915_NUM_ENGINES)
  46                 return NULL;
  47
  48         return i915->engine[id];
  49 }
  50
  51 static inline const char *
  52 __engine_name(const struct intel_engine_cs *engine)
  53 {
  54         return engine ? engine->name : "";
  55 }
  56
  57 static const char *
  58 engine_name(const struct drm_i915_private *i915, unsigned int id)
  59 {
  60         return __engine_name(engine_lookup(i915, id));
  61 }
  62
  63 static const char *tiling_flag(int tiling)
  64 {
  65         switch (tiling) {
  66         default:
  67         case I915_TILING_NONE: return "";
  68         case I915_TILING_X: return " X";
  69         case I915_TILING_Y: return " Y";
  70         }
  71 }
  72
  73 static const char *dirty_flag(int dirty)
  74 {
  75         return dirty ? " dirty" : "";
  76 }
  77
  78 static const char *purgeable_flag(int purgeable)
  79 {
  80         return purgeable ? " purgeable" : "";
  81 }
  82
  83 static void __sg_set_buf(struct scatterlist *sg,
  84                          void *addr, unsigned int len, loff_t it)
  85 {
  86         sg->page_link = (unsigned long)virt_to_page(addr);
  87         sg->offset = offset_in_page(addr);
  88         sg->length = len;
  89         sg->dma_address = it;
  90 }
  91
  92 static bool __i915_error_grow(struct drm_i915_error_state_buf *e, size_t len)
  93 {
  94         if (!len)
  95                 return false;
  96
  97         if (e->bytes + len + 1 <= e->size)
  98                 return true;
  99
 100         if (e->bytes) {
 101                 __sg_set_buf(e->cur++, e->buf, e->bytes, e->iter);
 102                 e->iter += e->bytes;
 103                 e->buf = NULL;
 104                 e->bytes = 0;
 105         }
 106
 107         if (e->cur == e->end) {
 108                 struct scatterlist *sgl;
 109
 110                 sgl = (typeof(sgl))__get_free_page(GFP_KERNEL);
 111                 if (!sgl) {
 112                         e->err = -ENOMEM;
 113                         return false;
 114                 }
 115
 116                 if (e->cur) {
 117                         e->cur->offset = 0;
 118                         e->cur->length = 0;
 119                         e->cur->page_link =
 120                                 (unsigned long)sgl | SG_CHAIN;
 121                 } else {
 122                         e->sgl = sgl;
 123                 }
 124
 125                 e->cur = sgl;
 126                 e->end = sgl + SG_MAX_SINGLE_ALLOC - 1;
 127         }
 128
 129         e->size = ALIGN(len + 1, SZ_64K);
 130         e->buf = kmalloc(e->size, GFP_KERNEL | __GFP_NOWARN | __GFP_NORETRY);
 131         if (!e->buf) {
 132                 e->size = PAGE_ALIGN(len + 1);
 133                 e->buf = kmalloc(e->size, GFP_KERNEL);
 134         }
 135         if (!e->buf) {
 136                 e->err = -ENOMEM;
 137                 return false;
 138         }
 139
 140         return true;
 141 }
 142
 143 __printf(2, 0)
 144 static void i915_error_vprintf(struct drm_i915_error_state_buf *e,
 145                                const char *fmt, va_list args)
 146 {
 147         va_list ap;
 148         int len;
 149
 150         if (e->err)
 151                 return;
 152
 153         va_copy(ap, args);
 154         len = vsnprintf(NULL, 0, fmt, ap);
 155         va_end(ap);
 156         if (len <= 0) {
 157                 e->err = len;
 158                 return;
 159         }
 160
 161         if (!__i915_error_grow(e, len))
 162                 return;
 163
 164         GEM_BUG_ON(e->bytes >= e->size);
 165         len = vscnprintf(e->buf + e->bytes, e->size - e->bytes, fmt, args);
 166         if (len < 0) {
 167                 e->err = len;
 168                 return;
 169         }
 170         e->bytes += len;
 171 }
 172
 173 static void i915_error_puts(struct drm_i915_error_state_buf *e, const char *str)
 174 {
 175         unsigned len;
 176
 177         if (e->err || !str)
 178                 return;
 179
 180         len = strlen(str);
 181         if (!__i915_error_grow(e, len))
 182                 return;
 183
 184         GEM_BUG_ON(e->bytes + len > e->size);
 185         memcpy(e->buf + e->bytes, str, len);
 186         e->bytes += len;
 187 }
 188
 189 #define err_printf(e, ...) i915_error_printf(e, __VA_ARGS__)
 190 #define err_puts(e, s) i915_error_puts(e, s)
 191
 192 static void __i915_printfn_error(struct drm_printer *p, struct va_format *vaf)
 193 {
 194         i915_error_vprintf(p->arg, vaf->fmt, *vaf->va);
 195 }
 196
 197 static inline struct drm_printer
 198 i915_error_printer(struct drm_i915_error_state_buf *e)
 199 {
 200         struct drm_printer p = {
 201                 .printfn = __i915_printfn_error,
 202                 .arg = e,
 203         };
 204         return p;
 205 }
 206
 207 #ifdef CONFIG_DRM_I915_COMPRESS_ERROR
 208
 209 struct compress {
 210         struct z_stream_s zstream;
 211         void *tmp;
 212 };
 213
 214 static bool compress_init(struct compress *c)
 215 {
 216         struct z_stream_s *zstream = memset(&c->zstream, 0, sizeof(c->zstream));
 217
 218         zstream->workspace =
 219                 kmalloc(zlib_deflate_workspacesize(MAX_WBITS, MAX_MEM_LEVEL),
 220                         GFP_ATOMIC | __GFP_NOWARN);
 221         if (!zstream->workspace)
 222                 return false;
 223
 224         if (zlib_deflateInit(zstream, Z_DEFAULT_COMPRESSION) != Z_OK) {
 225                 kfree(zstream->workspace);
 226                 return false;
 227         }
 228
 229         c->tmp = NULL;
 230         if (i915_has_memcpy_from_wc())
 231                 c->tmp = (void *)__get_free_page(GFP_ATOMIC | __GFP_NOWARN);
 232
 233         return true;
 234 }
 235
 236 static void *compress_next_page(struct drm_i915_error_object *dst)
 237 {
 238         unsigned long page;
 239
 240         if (dst->page_count >= dst->num_pages)
 241                 return ERR_PTR(-ENOSPC);
 242
 243         page = __get_free_page(GFP_ATOMIC | __GFP_NOWARN);
 244         if (!page)
 245                 return ERR_PTR(-ENOMEM);
 246
 247         return dst->pages[dst->page_count++] = (void *)page;
 248 }
 249
 250 static int compress_page(struct compress *c,
 251                          void *src,
 252                          struct drm_i915_error_object *dst)
 253 {
 254         struct z_stream_s *zstream = &c->zstream;
 255
 256         zstream->next_in = src;
 257         if (c->tmp && i915_memcpy_from_wc(c->tmp, src, PAGE_SIZE))
 258                 zstream->next_in = c->tmp;
 259         zstream->avail_in = PAGE_SIZE;
 260
 261         do {
 262                 if (zstream->avail_out == 0) {
 263                         zstream->next_out = compress_next_page(dst);
 264                         if (IS_ERR(zstream->next_out))
 265                                 return PTR_ERR(zstream->next_out);
 266
 267                         zstream->avail_out = PAGE_SIZE;
 268                 }
 269
 270                 if (zlib_deflate(zstream, Z_NO_FLUSH) != Z_OK)
 271                         return -EIO;
 272
 273                 touch_nmi_watchdog();
 274         } while (zstream->avail_in);
 275
 276         /* Fallback to uncompressed if we increase size? */
 277         if (0 && zstream->total_out > zstream->total_in)
 278                 return -E2BIG;
 279
 280         return 0;
 281 }
 282
 283 static int compress_flush(struct compress *c,
 284                           struct drm_i915_error_object *dst)
 285 {
 286         struct z_stream_s *zstream = &c->zstream;
 287
 288         do {
 289                 switch (zlib_deflate(zstream, Z_FINISH)) {
 290                 case Z_OK: /* more space requested */
 291                         zstream->next_out = compress_next_page(dst);
 292                         if (IS_ERR(zstream->next_out))
 293                                 return PTR_ERR(zstream->next_out);
 294
 295                         zstream->avail_out = PAGE_SIZE;
 296                         break;
 297
 298                 case Z_STREAM_END:
 299                         goto end;
 300
 301                 default: /* any error */
 302                         return -EIO;
 303                 }
 304         } while (1);
 305
 306 end:
 307         memset(zstream->next_out, 0, zstream->avail_out);
 308         dst->unused = zstream->avail_out;
 309         return 0;
 310 }
 311
 312 static void compress_fini(struct compress *c,
 313                           struct drm_i915_error_object *dst)
 314 {
 315         struct z_stream_s *zstream = &c->zstream;
 316
 317         zlib_deflateEnd(zstream);
 318         kfree(zstream->workspace);
 319         if (c->tmp)
 320                 free_page((unsigned long)c->tmp);
 321 }
 322
 323 static void err_compression_marker(struct drm_i915_error_state_buf *m)
 324 {
 325         err_puts(m, ":");
 326 }
 327
 328 #else
 329
 330 struct compress {
 331 };
 332
 333 static bool compress_init(struct compress *c)
 334 {
 335         return true;
 336 }
 337
 338 static int compress_page(struct compress *c,
 339                          void *src,
 340                          struct drm_i915_error_object *dst)
 341 {
 342         unsigned long page;
 343         void *ptr;
 344
 345         page = __get_free_page(GFP_ATOMIC | __GFP_NOWARN);
 346         if (!page)
 347                 return -ENOMEM;
 348
 349         ptr = (void *)page;
 350         if (!i915_memcpy_from_wc(ptr, src, PAGE_SIZE))
 351                 memcpy(ptr, src, PAGE_SIZE);
 352         dst->pages[dst->page_count++] = ptr;
 353
 354         return 0;
 355 }
 356
 357 static int compress_flush(struct compress *c,
 358                           struct drm_i915_error_object *dst)
 359 {
 360         return 0;
 361 }
 362
 363 static void compress_fini(struct compress *c,
 364                           struct drm_i915_error_object *dst)
 365 {
 366 }
 367
 368 static void err_compression_marker(struct drm_i915_error_state_buf *m)
 369 {
 370         err_puts(m, "~");
 371 }
 372
 373 #endif
 374
 375 static void print_error_buffers(struct drm_i915_error_state_buf *m,
 376                                 const char *name,
 377                                 struct drm_i915_error_buffer *err,
 378                                 int count)
 379 {
 380         err_printf(m, "%s [%d]:\n", name, count);
 381
 382         while (count--) {
 383                 err_printf(m, "    %08x_%08x %8u %02x %02x",
 384                            upper_32_bits(err->gtt_offset),
 385                            lower_32_bits(err->gtt_offset),
 386                            err->size,
 387                            err->read_domains,
 388                            err->write_domain);
 389                 err_puts(m, tiling_flag(err->tiling));
 390                 err_puts(m, dirty_flag(err->dirty));
 391                 err_puts(m, purgeable_flag(err->purgeable));
 392                 err_puts(m, err->userptr ? " userptr" : "");
 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 != RCS0 || 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 void error_print_request(struct drm_i915_error_state_buf *m,
 435                                 const char *prefix,
 436                                 const struct drm_i915_error_request *erq,
 437                                 const unsigned long epoch)
 438 {
 439         if (!erq->seqno)
 440                 return;
 441
 442         err_printf(m, "%s pid %d, seqno %8x:%08x%s%s, prio %d, emitted %dms, start %08x, head %08x, tail %08x\n",
 443                    prefix, erq->pid, erq->context, erq->seqno,
 444                    test_bit(DMA_FENCE_FLAG_SIGNALED_BIT,
 445                             &erq->flags) ? "!" : "",
 446                    test_bit(DMA_FENCE_FLAG_ENABLE_SIGNAL_BIT,
 447                             &erq->flags) ? "+" : "",
 448                    erq->sched_attr.priority,
 449                    jiffies_to_msecs(erq->jiffies - epoch),
 450                    erq->start, erq->head, erq->tail);
 451 }
 452
 453 static void error_print_context(struct drm_i915_error_state_buf *m,
 454                                 const char *header,
 455                                 const struct drm_i915_error_context *ctx)
 456 {
 457         err_printf(m, "%s%s[%d] hw_id %d, prio %d, guilty %d active %d\n",
 458                    header, ctx->comm, ctx->pid, ctx->hw_id,
 459                    ctx->sched_attr.priority, ctx->guilty, ctx->active);
 460 }
 461
 462 static void error_print_engine(struct drm_i915_error_state_buf *m,
 463                                const struct drm_i915_error_engine *ee,
 464                                const unsigned long epoch)
 465 {
 466         int n;
 467
 468         err_printf(m, "%s command stream:\n",
 469                    engine_name(m->i915, ee->engine_id));
 470         err_printf(m, "  IDLE?: %s\n", yesno(ee->idle));
 471         err_printf(m, "  START: 0x%08x\n", ee->start);
 472         err_printf(m, "  HEAD:  0x%08x [0x%08x]\n", ee->head, ee->rq_head);
 473         err_printf(m, "  TAIL:  0x%08x [0x%08x, 0x%08x]\n",
 474                    ee->tail, ee->rq_post, ee->rq_tail);
 475         err_printf(m, "  CTL:   0x%08x\n", ee->ctl);
 476         err_printf(m, "  MODE:  0x%08x\n", ee->mode);
 477         err_printf(m, "  HWS:   0x%08x\n", ee->hws);
 478         err_printf(m, "  ACTHD: 0x%08x %08x\n",
 479                    (u32)(ee->acthd>>32), (u32)ee->acthd);
 480         err_printf(m, "  IPEIR: 0x%08x\n", ee->ipeir);
 481         err_printf(m, "  IPEHR: 0x%08x\n", ee->ipehr);
 482
 483         error_print_instdone(m, ee);
 484
 485         if (ee->batchbuffer) {
 486                 u64 start = ee->batchbuffer->gtt_offset;
 487                 u64 end = start + ee->batchbuffer->gtt_size;
 488
 489                 err_printf(m, "  batch: [0x%08x_%08x, 0x%08x_%08x]\n",
 490                            upper_32_bits(start), lower_32_bits(start),
 491                            upper_32_bits(end), lower_32_bits(end));
 492         }
 493         if (INTEL_GEN(m->i915) >= 4) {
 494                 err_printf(m, "  BBADDR: 0x%08x_%08x\n",
 495                            (u32)(ee->bbaddr>>32), (u32)ee->bbaddr);
 496                 err_printf(m, "  BB_STATE: 0x%08x\n", ee->bbstate);
 497                 err_printf(m, "  INSTPS: 0x%08x\n", ee->instps);
 498         }
 499         err_printf(m, "  INSTPM: 0x%08x\n", ee->instpm);
 500         err_printf(m, "  FADDR: 0x%08x %08x\n", upper_32_bits(ee->faddr),
 501                    lower_32_bits(ee->faddr));
 502         if (INTEL_GEN(m->i915) >= 6) {
 503                 err_printf(m, "  RC PSMI: 0x%08x\n", ee->rc_psmi);
 504                 err_printf(m, "  FAULT_REG: 0x%08x\n", ee->fault_reg);
 505         }
 506         if (HAS_PPGTT(m->i915)) {
 507                 err_printf(m, "  GFX_MODE: 0x%08x\n", ee->vm_info.gfx_mode);
 508
 509                 if (INTEL_GEN(m->i915) >= 8) {
 510                         int i;
 511                         for (i = 0; i < 4; i++)
 512                                 err_printf(m, "  PDP%d: 0x%016llx\n",
 513                                            i, ee->vm_info.pdp[i]);
 514                 } else {
 515                         err_printf(m, "  PP_DIR_BASE: 0x%08x\n",
 516                                    ee->vm_info.pp_dir_base);
 517                 }
 518         }
 519         err_printf(m, "  ring->head: 0x%08x\n", ee->cpu_ring_head);
 520         err_printf(m, "  ring->tail: 0x%08x\n", ee->cpu_ring_tail);
 521         err_printf(m, "  hangcheck timestamp: %dms (%lu%s)\n",
 522                    jiffies_to_msecs(ee->hangcheck_timestamp - epoch),
 523                    ee->hangcheck_timestamp,
 524                    ee->hangcheck_timestamp == epoch ? "; epoch" : "");
 525         err_printf(m, "  engine reset count: %u\n", ee->reset_count);
 526
 527         for (n = 0; n < ee->num_ports; n++) {
 528                 err_printf(m, "  ELSP[%d]:", n);
 529                 error_print_request(m, " ", &ee->execlist[n], epoch);
 530         }
 531
 532         error_print_context(m, "  Active context: ", &ee->context);
 533 }
 534
 535 void i915_error_printf(struct drm_i915_error_state_buf *e, const char *f, ...)
 536 {
 537         va_list args;
 538
 539         va_start(args, f);
 540         i915_error_vprintf(e, f, args);
 541         va_end(args);
 542 }
 543
 544 static void print_error_obj(struct drm_i915_error_state_buf *m,
 545                             struct intel_engine_cs *engine,
 546                             const char *name,
 547                             struct drm_i915_error_object *obj)
 548 {
 549         char out[ASCII85_BUFSZ];
 550         int page;
 551
 552         if (!obj)
 553                 return;
 554
 555         if (name) {
 556                 err_printf(m, "%s --- %s = 0x%08x %08x\n",
 557                            engine ? engine->name : "global", name,
 558                            upper_32_bits(obj->gtt_offset),
 559                            lower_32_bits(obj->gtt_offset));
 560         }
 561
 562         err_compression_marker(m);
 563         for (page = 0; page < obj->page_count; page++) {
 564                 int i, len;
 565
 566                 len = PAGE_SIZE;
 567                 if (page == obj->page_count - 1)
 568                         len -= obj->unused;
 569                 len = ascii85_encode_len(len);
 570
 571                 for (i = 0; i < len; i++)
 572                         err_puts(m, ascii85_encode(obj->pages[page][i], out));
 573         }
 574         err_puts(m, "\n");
 575 }
 576
 577 static void err_print_capabilities(struct drm_i915_error_state_buf *m,
 578                                    const struct intel_device_info *info,
 579                                    const struct intel_runtime_info *runtime,
 580                                    const struct intel_driver_caps *caps)
 581 {
 582         struct drm_printer p = i915_error_printer(m);
 583
 584         intel_device_info_dump_flags(info, &p);
 585         intel_driver_caps_print(caps, &p);
 586         intel_device_info_dump_topology(&runtime->sseu, &p);
 587 }
 588
 589 static void err_print_params(struct drm_i915_error_state_buf *m,
 590                              const struct i915_params *params)
 591 {
 592         struct drm_printer p = i915_error_printer(m);
 593
 594         i915_params_dump(params, &p);
 595 }
 596
 597 static void err_print_pciid(struct drm_i915_error_state_buf *m,
 598                             struct drm_i915_private *i915)
 599 {
 600         struct pci_dev *pdev = i915->drm.pdev;
 601
 602         err_printf(m, "PCI ID: 0x%04x\n", pdev->device);
 603         err_printf(m, "PCI Revision: 0x%02x\n", pdev->revision);
 604         err_printf(m, "PCI Subsystem: %04x:%04x\n",
 605                    pdev->subsystem_vendor,
 606                    pdev->subsystem_device);
 607 }
 608
 609 static void err_print_uc(struct drm_i915_error_state_buf *m,
 610                          const struct i915_error_uc *error_uc)
 611 {
 612         struct drm_printer p = i915_error_printer(m);
 613         const struct i915_gpu_state *error =
 614                 container_of(error_uc, typeof(*error), uc);
 615
 616         if (!error->device_info.has_guc)
 617                 return;
 618
 619         intel_uc_fw_dump(&error_uc->guc_fw, &p);
 620         intel_uc_fw_dump(&error_uc->huc_fw, &p);
 621         print_error_obj(m, NULL, "GuC log buffer", error_uc->guc_log);
 622 }
 623
 624 static void err_free_sgl(struct scatterlist *sgl)
 625 {
 626         while (sgl) {
 627                 struct scatterlist *sg;
 628
 629                 for (sg = sgl; !sg_is_chain(sg); sg++) {
 630                         kfree(sg_virt(sg));
 631                         if (sg_is_last(sg))
 632                                 break;
 633                 }
 634
 635                 sg = sg_is_last(sg) ? NULL : sg_chain_ptr(sg);
 636                 free_page((unsigned long)sgl);
 637                 sgl = sg;
 638         }
 639 }
 640
 641 static void __err_print_to_sgl(struct drm_i915_error_state_buf *m,
 642                                struct i915_gpu_state *error)
 643 {
 644         struct drm_i915_error_object *obj;
 645         struct timespec64 ts;
 646         int i, j;
 647
 648         if (*error->error_msg)
 649                 err_printf(m, "%s\n", error->error_msg);
 650         err_printf(m, "Kernel: %s %s\n",
 651                    init_utsname()->release,
 652                    init_utsname()->machine);
 653         ts = ktime_to_timespec64(error->time);
 654         err_printf(m, "Time: %lld s %ld us\n",
 655                    (s64)ts.tv_sec, ts.tv_nsec / NSEC_PER_USEC);
 656         ts = ktime_to_timespec64(error->boottime);
 657         err_printf(m, "Boottime: %lld s %ld us\n",
 658                    (s64)ts.tv_sec, ts.tv_nsec / NSEC_PER_USEC);
 659         ts = ktime_to_timespec64(error->uptime);
 660         err_printf(m, "Uptime: %lld s %ld us\n",
 661                    (s64)ts.tv_sec, ts.tv_nsec / NSEC_PER_USEC);
 662         err_printf(m, "Epoch: %lu jiffies (%u HZ)\n", error->epoch, HZ);
 663         err_printf(m, "Capture: %lu jiffies; %d ms ago, %d ms after epoch\n",
 664                    error->capture,
 665                    jiffies_to_msecs(jiffies - error->capture),
 666                    jiffies_to_msecs(error->capture - error->epoch));
 667
 668         for (i = 0; i < ARRAY_SIZE(error->engine); i++) {
 669                 if (!error->engine[i].context.pid)
 670                         continue;
 671
 672                 err_printf(m, "Active process (on ring %s): %s [%d]\n",
 673                            engine_name(m->i915, i),
 674                            error->engine[i].context.comm,
 675                            error->engine[i].context.pid);
 676         }
 677         err_printf(m, "Reset count: %u\n", error->reset_count);
 678         err_printf(m, "Suspend count: %u\n", error->suspend_count);
 679         err_printf(m, "Platform: %s\n", intel_platform_name(error->device_info.platform));
 680         err_print_pciid(m, m->i915);
 681
 682         err_printf(m, "IOMMU enabled?: %d\n", error->iommu);
 683
 684         if (HAS_CSR(m->i915)) {
 685                 struct intel_csr *csr = &m->i915->csr;
 686
 687                 err_printf(m, "DMC loaded: %s\n",
 688                            yesno(csr->dmc_payload != NULL));
 689                 err_printf(m, "DMC fw version: %d.%d\n",
 690                            CSR_VERSION_MAJOR(csr->version),
 691                            CSR_VERSION_MINOR(csr->version));
 692         }
 693
 694         err_printf(m, "GT awake: %s\n", yesno(error->awake));
 695         err_printf(m, "RPM wakelock: %s\n", yesno(error->wakelock));
 696         err_printf(m, "PM suspended: %s\n", yesno(error->suspended));
 697         err_printf(m, "EIR: 0x%08x\n", error->eir);
 698         err_printf(m, "IER: 0x%08x\n", error->ier);
 699         for (i = 0; i < error->ngtier; i++)
 700                 err_printf(m, "GTIER[%d]: 0x%08x\n", i, error->gtier[i]);
 701         err_printf(m, "PGTBL_ER: 0x%08x\n", error->pgtbl_er);
 702         err_printf(m, "FORCEWAKE: 0x%08x\n", error->forcewake);
 703         err_printf(m, "DERRMR: 0x%08x\n", error->derrmr);
 704         err_printf(m, "CCID: 0x%08x\n", error->ccid);
 705
 706         for (i = 0; i < error->nfence; i++)
 707                 err_printf(m, "  fence[%d] = %08llx\n", i, error->fence[i]);
 708
 709         if (INTEL_GEN(m->i915) >= 6) {
 710                 err_printf(m, "ERROR: 0x%08x\n", error->error);
 711
 712                 if (INTEL_GEN(m->i915) >= 8)
 713                         err_printf(m, "FAULT_TLB_DATA: 0x%08x 0x%08x\n",
 714                                    error->fault_data1, error->fault_data0);
 715
 716                 err_printf(m, "DONE_REG: 0x%08x\n", error->done_reg);
 717         }
 718
 719         if (IS_GEN(m->i915, 7))
 720                 err_printf(m, "ERR_INT: 0x%08x\n", error->err_int);
 721
 722         for (i = 0; i < ARRAY_SIZE(error->engine); i++) {
 723                 if (error->engine[i].engine_id != -1)
 724                         error_print_engine(m, &error->engine[i], error->epoch);
 725         }
 726
 727         for (i = 0; i < ARRAY_SIZE(error->active_vm); i++) {
 728                 char buf[128];
 729                 int len, first = 1;
 730
 731                 if (!error->active_vm[i])
 732                         break;
 733
 734                 len = scnprintf(buf, sizeof(buf), "Active (");
 735                 for (j = 0; j < ARRAY_SIZE(error->engine); j++) {
 736                         if (error->engine[j].vm != error->active_vm[i])
 737                                 continue;
 738
 739                         len += scnprintf(buf + len, sizeof(buf), "%s%s",
 740                                          first ? "" : ", ",
 741                                          m->i915->engine[j]->name);
 742                         first = 0;
 743                 }
 744                 scnprintf(buf + len, sizeof(buf), ")");
 745                 print_error_buffers(m, buf,
 746                                     error->active_bo[i],
 747                                     error->active_bo_count[i]);
 748         }
 749
 750         print_error_buffers(m, "Pinned (global)",
 751                             error->pinned_bo,
 752                             error->pinned_bo_count);
 753
 754         for (i = 0; i < ARRAY_SIZE(error->engine); i++) {
 755                 const struct drm_i915_error_engine *ee = &error->engine[i];
 756
 757                 obj = ee->batchbuffer;
 758                 if (obj) {
 759                         err_puts(m, m->i915->engine[i]->name);
 760                         if (ee->context.pid)
 761                                 err_printf(m, " (submitted by %s [%d])",
 762                                            ee->context.comm,
 763                                            ee->context.pid);
 764                         err_printf(m, " --- gtt_offset = 0x%08x %08x\n",
 765                                    upper_32_bits(obj->gtt_offset),
 766                                    lower_32_bits(obj->gtt_offset));
 767                         print_error_obj(m, m->i915->engine[i], NULL, obj);
 768                 }
 769
 770                 for (j = 0; j < ee->user_bo_count; j++)
 771                         print_error_obj(m, m->i915->engine[i],
 772                                         "user", ee->user_bo[j]);
 773
 774                 if (ee->num_requests) {
 775                         err_printf(m, "%s --- %d requests\n",
 776                                    m->i915->engine[i]->name,
 777                                    ee->num_requests);
 778                         for (j = 0; j < ee->num_requests; j++)
 779                                 error_print_request(m, " ",
 780                                                     &ee->requests[j],
 781                                                     error->epoch);
 782                 }
 783
 784                 print_error_obj(m, m->i915->engine[i],
 785                                 "ringbuffer", ee->ringbuffer);
 786
 787                 print_error_obj(m, m->i915->engine[i],
 788                                 "HW Status", ee->hws_page);
 789
 790                 print_error_obj(m, m->i915->engine[i],
 791                                 "HW context", ee->ctx);
 792
 793                 print_error_obj(m, m->i915->engine[i],
 794                                 "WA context", ee->wa_ctx);
 795
 796                 print_error_obj(m, m->i915->engine[i],
 797                                 "WA batchbuffer", ee->wa_batchbuffer);
 798
 799                 print_error_obj(m, m->i915->engine[i],
 800                                 "NULL context", ee->default_state);
 801         }
 802
 803         if (error->overlay)
 804                 intel_overlay_print_error_state(m, error->overlay);
 805
 806         if (error->display)
 807                 intel_display_print_error_state(m, error->display);
 808
 809         err_print_capabilities(m, &error->device_info, &error->runtime_info,
 810                                &error->driver_caps);
 811         err_print_params(m, &error->params);
 812         err_print_uc(m, &error->uc);
 813 }
 814
 815 static int err_print_to_sgl(struct i915_gpu_state *error)
 816 {
 817         struct drm_i915_error_state_buf m;
 818
 819         if (IS_ERR(error))
 820                 return PTR_ERR(error);
 821
 822         if (READ_ONCE(error->sgl))
 823                 return 0;
 824
 825         memset(&m, 0, sizeof(m));
 826         m.i915 = error->i915;
 827
 828         __err_print_to_sgl(&m, error);
 829
 830         if (m.buf) {
 831                 __sg_set_buf(m.cur++, m.buf, m.bytes, m.iter);
 832                 m.bytes = 0;
 833                 m.buf = NULL;
 834         }
 835         if (m.cur) {
 836                 GEM_BUG_ON(m.end < m.cur);
 837                 sg_mark_end(m.cur - 1);
 838         }
 839         GEM_BUG_ON(m.sgl && !m.cur);
 840
 841         if (m.err) {
 842                 err_free_sgl(m.sgl);
 843                 return m.err;
 844         }
 845
 846         if (cmpxchg(&error->sgl, NULL, m.sgl))
 847                 err_free_sgl(m.sgl);
 848
 849         return 0;
 850 }
 851
 852 ssize_t i915_gpu_state_copy_to_buffer(struct i915_gpu_state *error,
 853                                       char *buf, loff_t off, size_t rem)
 854 {
 855         struct scatterlist *sg;
 856         size_t count;
 857         loff_t pos;
 858         int err;
 859
 860         if (!error || !rem)
 861                 return 0;
 862
 863         err = err_print_to_sgl(error);
 864         if (err)
 865                 return err;
 866
 867         sg = READ_ONCE(error->fit);
 868         if (!sg || off < sg->dma_address)
 869                 sg = error->sgl;
 870         if (!sg)
 871                 return 0;
 872
 873         pos = sg->dma_address;
 874         count = 0;
 875         do {
 876                 size_t len, start;
 877
 878                 if (sg_is_chain(sg)) {
 879                         sg = sg_chain_ptr(sg);
 880                         GEM_BUG_ON(sg_is_chain(sg));
 881                 }
 882
 883                 len = sg->length;
 884                 if (pos + len <= off) {
 885                         pos += len;
 886                         continue;
 887                 }
 888
 889                 start = sg->offset;
 890                 if (pos < off) {
 891                         GEM_BUG_ON(off - pos > len);
 892                         len -= off - pos;
 893                         start += off - pos;
 894                         pos = off;
 895                 }
 896
 897                 len = min(len, rem);
 898                 GEM_BUG_ON(!len || len > sg->length);
 899
 900                 memcpy(buf, page_address(sg_page(sg)) + start, len);
 901
 902                 count += len;
 903                 pos += len;
 904
 905                 buf += len;
 906                 rem -= len;
 907                 if (!rem) {
 908                         WRITE_ONCE(error->fit, sg);
 909                         break;
 910                 }
 911         } while (!sg_is_last(sg++));
 912
 913         return count;
 914 }
 915
 916 static void i915_error_object_free(struct drm_i915_error_object *obj)
 917 {
 918         int page;
 919
 920         if (obj == NULL)
 921                 return;
 922
 923         for (page = 0; page < obj->page_count; page++)
 924                 free_page((unsigned long)obj->pages[page]);
 925
 926         kfree(obj);
 927 }
 928
 929
 930 static void cleanup_params(struct i915_gpu_state *error)
 931 {
 932         i915_params_free(&error->params);
 933 }
 934
 935 static void cleanup_uc_state(struct i915_gpu_state *error)
 936 {
 937         struct i915_error_uc *error_uc = &error->uc;
 938
 939         kfree(error_uc->guc_fw.path);
 940         kfree(error_uc->huc_fw.path);
 941         i915_error_object_free(error_uc->guc_log);
 942 }
 943
 944 void __i915_gpu_state_free(struct kref *error_ref)
 945 {
 946         struct i915_gpu_state *error =
 947                 container_of(error_ref, typeof(*error), ref);
 948         long i, j;
 949
 950         for (i = 0; i < ARRAY_SIZE(error->engine); i++) {
 951                 struct drm_i915_error_engine *ee = &error->engine[i];
 952
 953                 for (j = 0; j < ee->user_bo_count; j++)
 954                         i915_error_object_free(ee->user_bo[j]);
 955                 kfree(ee->user_bo);
 956
 957                 i915_error_object_free(ee->batchbuffer);
 958                 i915_error_object_free(ee->wa_batchbuffer);
 959                 i915_error_object_free(ee->ringbuffer);
 960                 i915_error_object_free(ee->hws_page);
 961                 i915_error_object_free(ee->ctx);
 962                 i915_error_object_free(ee->wa_ctx);
 963
 964                 kfree(ee->requests);
 965         }
 966
 967         for (i = 0; i < ARRAY_SIZE(error->active_bo); i++)
 968                 kfree(error->active_bo[i]);
 969         kfree(error->pinned_bo);
 970
 971         kfree(error->overlay);
 972         kfree(error->display);
 973
 974         cleanup_params(error);
 975         cleanup_uc_state(error);
 976
 977         err_free_sgl(error->sgl);
 978         kfree(error);
 979 }
 980
 981 static struct drm_i915_error_object *
 982 i915_error_object_create(struct drm_i915_private *i915,
 983                          struct i915_vma *vma)
 984 {
 985         struct i915_ggtt *ggtt = &i915->ggtt;
 986         const u64 slot = ggtt->error_capture.start;
 987         struct drm_i915_error_object *dst;
 988         struct compress compress;
 989         unsigned long num_pages;
 990         struct sgt_iter iter;
 991         dma_addr_t dma;
 992         int ret;
 993
 994         if (!vma || !vma->pages)
 995                 return NULL;
 996
 997         num_pages = min_t(u64, vma->size, vma->obj->base.size) >> PAGE_SHIFT;
 998         num_pages = DIV_ROUND_UP(10 * num_pages, 8); /* worstcase zlib growth */
 999         dst = kmalloc(sizeof(*dst) + num_pages * sizeof(u32 *),
1000                       GFP_ATOMIC | __GFP_NOWARN);
1001         if (!dst)
1002                 return NULL;
1003
1004         dst->gtt_offset = vma->node.start;
1005         dst->gtt_size = vma->node.size;
1006         dst->num_pages = num_pages;
1007         dst->page_count = 0;
1008         dst->unused = 0;
1009
1010         if (!compress_init(&compress)) {
1011                 kfree(dst);
1012                 return NULL;
1013         }
1014
1015         ret = -EINVAL;
1016         for_each_sgt_dma(dma, iter, vma->pages) {
1017                 void __iomem *s;
1018
1019                 ggtt->vm.insert_page(&ggtt->vm, dma, slot, I915_CACHE_NONE, 0);
1020
1021                 s = io_mapping_map_atomic_wc(&ggtt->iomap, slot);
1022                 ret = compress_page(&compress, (void  __force *)s, dst);
1023                 io_mapping_unmap_atomic(s);
1024                 if (ret)
1025                         break;
1026         }
1027
1028         if (ret || compress_flush(&compress, dst)) {
1029                 while (dst->page_count--)
1030                         free_page((unsigned long)dst->pages[dst->page_count]);
1031                 kfree(dst);
1032                 dst = NULL;
1033         }
1034
1035         compress_fini(&compress, dst);
1036         return dst;
1037 }
1038
1039 static void capture_bo(struct drm_i915_error_buffer *err,
1040                        struct i915_vma *vma)
1041 {
1042         struct drm_i915_gem_object *obj = vma->obj;
1043
1044         err->size = obj->base.size;
1045         err->name = obj->base.name;
1046
1047         err->gtt_offset = vma->node.start;
1048         err->read_domains = obj->read_domains;
1049         err->write_domain = obj->write_domain;
1050         err->fence_reg = vma->fence ? vma->fence->id : -1;
1051         err->tiling = i915_gem_object_get_tiling(obj);
1052         err->dirty = obj->mm.dirty;
1053         err->purgeable = obj->mm.madv != I915_MADV_WILLNEED;
1054         err->userptr = obj->userptr.mm != NULL;
1055         err->cache_level = obj->cache_level;
1056 }
1057
1058 static u32 capture_error_bo(struct drm_i915_error_buffer *err,
1059                             int count, struct list_head *head,
1060                             unsigned int flags)
1061 #define ACTIVE_ONLY BIT(0)
1062 #define PINNED_ONLY BIT(1)
1063 {
1064         struct i915_vma *vma;
1065         int i = 0;
1066
1067         list_for_each_entry(vma, head, vm_link) {
1068                 if (!vma->obj)
1069                         continue;
1070
1071                 if (flags & ACTIVE_ONLY && !i915_vma_is_active(vma))
1072                         continue;
1073
1074                 if (flags & PINNED_ONLY && !i915_vma_is_pinned(vma))
1075                         continue;
1076
1077                 capture_bo(err++, vma);
1078                 if (++i == count)
1079                         break;
1080         }
1081
1082         return i;
1083 }
1084
1085 /*
1086  * Generate a semi-unique error code. The code is not meant to have meaning, The
1087  * code's only purpose is to try to prevent false duplicated bug reports by
1088  * grossly estimating a GPU error state.
1089  *
1090  * TODO Ideally, hashing the batchbuffer would be a very nice way to determine
1091  * the hang if we could strip the GTT offset information from it.
1092  *
1093  * It's only a small step better than a random number in its current form.
1094  */
1095 static u32 i915_error_generate_code(struct i915_gpu_state *error,
1096                                     unsigned long engine_mask)
1097 {
1098         /*
1099          * IPEHR would be an ideal way to detect errors, as it's the gross
1100          * measure of "the command that hung." However, has some very common
1101          * synchronization commands which almost always appear in the case
1102          * strictly a client bug. Use instdone to differentiate those some.
1103          */
1104         if (engine_mask) {
1105                 struct drm_i915_error_engine *ee =
1106                         &error->engine[ffs(engine_mask)];
1107
1108                 return ee->ipehr ^ ee->instdone.instdone;
1109         }
1110
1111         return 0;
1112 }
1113
1114 static void gem_record_fences(struct i915_gpu_state *error)
1115 {
1116         struct drm_i915_private *dev_priv = error->i915;
1117         int i;
1118
1119         if (INTEL_GEN(dev_priv) >= 6) {
1120                 for (i = 0; i < dev_priv->num_fence_regs; i++)
1121                         error->fence[i] = I915_READ64(FENCE_REG_GEN6_LO(i));
1122         } else if (INTEL_GEN(dev_priv) >= 4) {
1123                 for (i = 0; i < dev_priv->num_fence_regs; i++)
1124                         error->fence[i] = I915_READ64(FENCE_REG_965_LO(i));
1125         } else {
1126                 for (i = 0; i < dev_priv->num_fence_regs; i++)
1127                         error->fence[i] = I915_READ(FENCE_REG(i));
1128         }
1129         error->nfence = i;
1130 }
1131
1132 static void error_record_engine_registers(struct i915_gpu_state *error,
1133                                           struct intel_engine_cs *engine,
1134                                           struct drm_i915_error_engine *ee)
1135 {
1136         struct drm_i915_private *dev_priv = engine->i915;
1137
1138         if (INTEL_GEN(dev_priv) >= 6) {
1139                 ee->rc_psmi = I915_READ(RING_PSMI_CTL(engine->mmio_base));
1140                 if (INTEL_GEN(dev_priv) >= 8)
1141                         ee->fault_reg = I915_READ(GEN8_RING_FAULT_REG);
1142                 else
1143                         ee->fault_reg = I915_READ(RING_FAULT_REG(engine));
1144         }
1145
1146         if (INTEL_GEN(dev_priv) >= 4) {
1147                 ee->faddr = I915_READ(RING_DMA_FADD(engine->mmio_base));
1148                 ee->ipeir = I915_READ(RING_IPEIR(engine->mmio_base));
1149                 ee->ipehr = I915_READ(RING_IPEHR(engine->mmio_base));
1150                 ee->instps = I915_READ(RING_INSTPS(engine->mmio_base));
1151                 ee->bbaddr = I915_READ(RING_BBADDR(engine->mmio_base));
1152                 if (INTEL_GEN(dev_priv) >= 8) {
1153                         ee->faddr |= (u64) I915_READ(RING_DMA_FADD_UDW(engine->mmio_base)) << 32;
1154                         ee->bbaddr |= (u64) I915_READ(RING_BBADDR_UDW(engine->mmio_base)) << 32;
1155                 }
1156                 ee->bbstate = I915_READ(RING_BBSTATE(engine->mmio_base));
1157         } else {
1158                 ee->faddr = I915_READ(DMA_FADD_I8XX);
1159                 ee->ipeir = I915_READ(IPEIR);
1160                 ee->ipehr = I915_READ(IPEHR);
1161         }
1162
1163         intel_engine_get_instdone(engine, &ee->instdone);
1164
1165         ee->instpm = I915_READ(RING_INSTPM(engine->mmio_base));
1166         ee->acthd = intel_engine_get_active_head(engine);
1167         ee->start = I915_READ_START(engine);
1168         ee->head = I915_READ_HEAD(engine);
1169         ee->tail = I915_READ_TAIL(engine);
1170         ee->ctl = I915_READ_CTL(engine);
1171         if (INTEL_GEN(dev_priv) > 2)
1172                 ee->mode = I915_READ_MODE(engine);
1173
1174         if (!HWS_NEEDS_PHYSICAL(dev_priv)) {
1175                 i915_reg_t mmio;
1176
1177                 if (IS_GEN(dev_priv, 7)) {
1178                         switch (engine->id) {
1179                         default:
1180                                 MISSING_CASE(engine->id);
1181                         case RCS0:
1182                                 mmio = RENDER_HWS_PGA_GEN7;
1183                                 break;
1184                         case BCS0:
1185                                 mmio = BLT_HWS_PGA_GEN7;
1186                                 break;
1187                         case VCS0:
1188                                 mmio = BSD_HWS_PGA_GEN7;
1189                                 break;
1190                         case VECS0:
1191                                 mmio = VEBOX_HWS_PGA_GEN7;
1192                                 break;
1193                         }
1194                 } else if (IS_GEN(engine->i915, 6)) {
1195                         mmio = RING_HWS_PGA_GEN6(engine->mmio_base);
1196                 } else {
1197                         /* XXX: gen8 returns to sanity */
1198                         mmio = RING_HWS_PGA(engine->mmio_base);
1199                 }
1200
1201                 ee->hws = I915_READ(mmio);
1202         }
1203
1204         ee->idle = intel_engine_is_idle(engine);
1205         if (!ee->idle)
1206                 ee->hangcheck_timestamp = engine->hangcheck.action_timestamp;
1207         ee->reset_count = i915_reset_engine_count(&dev_priv->gpu_error,
1208                                                   engine);
1209
1210         if (HAS_PPGTT(dev_priv)) {
1211                 int i;
1212
1213                 ee->vm_info.gfx_mode = I915_READ(RING_MODE_GEN7(engine));
1214
1215                 if (IS_GEN(dev_priv, 6))
1216                         ee->vm_info.pp_dir_base =
1217                                 I915_READ(RING_PP_DIR_BASE_READ(engine));
1218                 else if (IS_GEN(dev_priv, 7))
1219                         ee->vm_info.pp_dir_base =
1220                                 I915_READ(RING_PP_DIR_BASE(engine));
1221                 else if (INTEL_GEN(dev_priv) >= 8)
1222                         for (i = 0; i < 4; i++) {
1223                                 ee->vm_info.pdp[i] =
1224                                         I915_READ(GEN8_RING_PDP_UDW(engine, i));
1225                                 ee->vm_info.pdp[i] <<= 32;
1226                                 ee->vm_info.pdp[i] |=
1227                                         I915_READ(GEN8_RING_PDP_LDW(engine, i));
1228                         }
1229         }
1230 }
1231
1232 static void record_request(struct i915_request *request,
1233                            struct drm_i915_error_request *erq)
1234 {
1235         struct i915_gem_context *ctx = request->gem_context;
1236
1237         erq->flags = request->fence.flags;
1238         erq->context = request->fence.context;
1239         erq->seqno = request->fence.seqno;
1240         erq->sched_attr = request->sched.attr;
1241         erq->jiffies = request->emitted_jiffies;
1242         erq->start = i915_ggtt_offset(request->ring->vma);
1243         erq->head = request->head;
1244         erq->tail = request->tail;
1245
1246         rcu_read_lock();
1247         erq->pid = ctx->pid ? pid_nr(ctx->pid) : 0;
1248         rcu_read_unlock();
1249 }
1250
1251 static void engine_record_requests(struct intel_engine_cs *engine,
1252                                    struct i915_request *first,
1253                                    struct drm_i915_error_engine *ee)
1254 {
1255         struct i915_request *request;
1256         int count;
1257
1258         count = 0;
1259         request = first;
1260         list_for_each_entry_from(request, &engine->timeline.requests, link)
1261                 count++;
1262         if (!count)
1263                 return;
1264
1265         ee->requests = kcalloc(count, sizeof(*ee->requests), GFP_ATOMIC);
1266         if (!ee->requests)
1267                 return;
1268
1269         ee->num_requests = count;
1270
1271         count = 0;
1272         request = first;
1273         list_for_each_entry_from(request, &engine->timeline.requests, link) {
1274                 if (count >= ee->num_requests) {
1275                         /*
1276                          * If the ring request list was changed in
1277                          * between the point where the error request
1278                          * list was created and dimensioned and this
1279                          * point then just exit early to avoid crashes.
1280                          *
1281                          * We don't need to communicate that the
1282                          * request list changed state during error
1283                          * state capture and that the error state is
1284                          * slightly incorrect as a consequence since we
1285                          * are typically only interested in the request
1286                          * list state at the point of error state
1287                          * capture, not in any changes happening during
1288                          * the capture.
1289                          */
1290                         break;
1291                 }
1292
1293                 record_request(request, &ee->requests[count++]);
1294         }
1295         ee->num_requests = count;
1296 }
1297
1298 static void error_record_engine_execlists(struct intel_engine_cs *engine,
1299                                           struct drm_i915_error_engine *ee)
1300 {
1301         const struct intel_engine_execlists * const execlists = &engine->execlists;
1302         unsigned int n;
1303
1304         for (n = 0; n < execlists_num_ports(execlists); n++) {
1305                 struct i915_request *rq = port_request(&execlists->port[n]);
1306
1307                 if (!rq)
1308                         break;
1309
1310                 record_request(rq, &ee->execlist[n]);
1311         }
1312
1313         ee->num_ports = n;
1314 }
1315
1316 static void record_context(struct drm_i915_error_context *e,
1317                            struct i915_gem_context *ctx)
1318 {
1319         if (ctx->pid) {
1320                 struct task_struct *task;
1321
1322                 rcu_read_lock();
1323                 task = pid_task(ctx->pid, PIDTYPE_PID);
1324                 if (task) {
1325                         strcpy(e->comm, task->comm);
1326                         e->pid = task->pid;
1327                 }
1328                 rcu_read_unlock();
1329         }
1330
1331         e->hw_id = ctx->hw_id;
1332         e->sched_attr = ctx->sched;
1333         e->guilty = atomic_read(&ctx->guilty_count);
1334         e->active = atomic_read(&ctx->active_count);
1335 }
1336
1337 static void request_record_user_bo(struct i915_request *request,
1338                                    struct drm_i915_error_engine *ee)
1339 {
1340         struct i915_capture_list *c;
1341         struct drm_i915_error_object **bo;
1342         long count, max;
1343
1344         max = 0;
1345         for (c = request->capture_list; c; c = c->next)
1346                 max++;
1347         if (!max)
1348                 return;
1349
1350         bo = kmalloc_array(max, sizeof(*bo), GFP_ATOMIC);
1351         if (!bo) {
1352                 /* If we can't capture everything, try to capture something. */
1353                 max = min_t(long, max, PAGE_SIZE / sizeof(*bo));
1354                 bo = kmalloc_array(max, sizeof(*bo), GFP_ATOMIC);
1355         }
1356         if (!bo)
1357                 return;
1358
1359         count = 0;
1360         for (c = request->capture_list; c; c = c->next) {
1361                 bo[count] = i915_error_object_create(request->i915, c->vma);
1362                 if (!bo[count])
1363                         break;
1364                 if (++count == max)
1365                         break;
1366         }
1367
1368         ee->user_bo = bo;
1369         ee->user_bo_count = count;
1370 }
1371
1372 static struct drm_i915_error_object *
1373 capture_object(struct drm_i915_private *dev_priv,
1374                struct drm_i915_gem_object *obj)
1375 {
1376         if (obj && i915_gem_object_has_pages(obj)) {
1377                 struct i915_vma fake = {
1378                         .node = { .start = U64_MAX, .size = obj->base.size },
1379                         .size = obj->base.size,
1380                         .pages = obj->mm.pages,
1381                         .obj = obj,
1382                 };
1383
1384                 return i915_error_object_create(dev_priv, &fake);
1385         } else {
1386                 return NULL;
1387         }
1388 }
1389
1390 static void gem_record_rings(struct i915_gpu_state *error)
1391 {
1392         struct drm_i915_private *i915 = error->i915;
1393         struct i915_ggtt *ggtt = &i915->ggtt;
1394         int i;
1395
1396         for (i = 0; i < I915_NUM_ENGINES; i++) {
1397                 struct intel_engine_cs *engine = i915->engine[i];
1398                 struct drm_i915_error_engine *ee = &error->engine[i];
1399                 struct i915_request *request;
1400
1401                 ee->engine_id = -1;
1402
1403                 if (!engine)
1404                         continue;
1405
1406                 ee->engine_id = i;
1407
1408                 error_record_engine_registers(error, engine, ee);
1409                 error_record_engine_execlists(engine, ee);
1410
1411                 request = intel_engine_find_active_request(engine);
1412                 if (request) {
1413                         struct i915_gem_context *ctx = request->gem_context;
1414                         struct intel_ring *ring;
1415
1416                         ee->vm = ctx->ppgtt ? &ctx->ppgtt->vm : &ggtt->vm;
1417
1418                         record_context(&ee->context, ctx);
1419
1420                         /* We need to copy these to an anonymous buffer
1421                          * as the simplest method to avoid being overwritten
1422                          * by userspace.
1423                          */
1424                         ee->batchbuffer =
1425                                 i915_error_object_create(i915, request->batch);
1426
1427                         if (HAS_BROKEN_CS_TLB(i915))
1428                                 ee->wa_batchbuffer =
1429                                         i915_error_object_create(i915,
1430                                                                  i915->gt.scratch);
1431                         request_record_user_bo(request, ee);
1432
1433                         ee->ctx =
1434                                 i915_error_object_create(i915,
1435                                                          request->hw_context->state);
1436
1437                         error->simulated |=
1438                                 i915_gem_context_no_error_capture(ctx);
1439
1440                         ee->rq_head = request->head;
1441                         ee->rq_post = request->postfix;
1442                         ee->rq_tail = request->tail;
1443
1444                         ring = request->ring;
1445                         ee->cpu_ring_head = ring->head;
1446                         ee->cpu_ring_tail = ring->tail;
1447                         ee->ringbuffer =
1448                                 i915_error_object_create(i915, ring->vma);
1449
1450                         engine_record_requests(engine, request, ee);
1451                 }
1452
1453                 ee->hws_page =
1454                         i915_error_object_create(i915,
1455                                                  engine->status_page.vma);
1456
1457                 ee->wa_ctx = i915_error_object_create(i915, engine->wa_ctx.vma);
1458
1459                 ee->default_state = capture_object(i915, engine->default_state);
1460         }
1461 }
1462
1463 static void gem_capture_vm(struct i915_gpu_state *error,
1464                            struct i915_address_space *vm,
1465                            int idx)
1466 {
1467         struct drm_i915_error_buffer *active_bo;
1468         struct i915_vma *vma;
1469         int count;
1470
1471         count = 0;
1472         list_for_each_entry(vma, &vm->bound_list, vm_link)
1473                 if (i915_vma_is_active(vma))
1474                         count++;
1475
1476         active_bo = NULL;
1477         if (count)
1478                 active_bo = kcalloc(count, sizeof(*active_bo), GFP_ATOMIC);
1479         if (active_bo)
1480                 count = capture_error_bo(active_bo,
1481                                          count, &vm->bound_list,
1482                                          ACTIVE_ONLY);
1483         else
1484                 count = 0;
1485
1486         error->active_vm[idx] = vm;
1487         error->active_bo[idx] = active_bo;
1488         error->active_bo_count[idx] = count;
1489 }
1490
1491 static void capture_active_buffers(struct i915_gpu_state *error)
1492 {
1493         int cnt = 0, i, j;
1494
1495         BUILD_BUG_ON(ARRAY_SIZE(error->engine) > ARRAY_SIZE(error->active_bo));
1496         BUILD_BUG_ON(ARRAY_SIZE(error->active_bo) != ARRAY_SIZE(error->active_vm));
1497         BUILD_BUG_ON(ARRAY_SIZE(error->active_bo) != ARRAY_SIZE(error->active_bo_count));
1498
1499         /* Scan each engine looking for unique active contexts/vm */
1500         for (i = 0; i < ARRAY_SIZE(error->engine); i++) {
1501                 struct drm_i915_error_engine *ee = &error->engine[i];
1502                 bool found;
1503
1504                 if (!ee->vm)
1505                         continue;
1506
1507                 found = false;
1508                 for (j = 0; j < i && !found; j++)
1509                         found = error->engine[j].vm == ee->vm;
1510                 if (!found)
1511                         gem_capture_vm(error, ee->vm, cnt++);
1512         }
1513 }
1514
1515 static void capture_pinned_buffers(struct i915_gpu_state *error)
1516 {
1517         struct i915_address_space *vm = &error->i915->ggtt.vm;
1518         struct drm_i915_error_buffer *bo;
1519         struct i915_vma *vma;
1520         int count;
1521
1522         count = 0;
1523         list_for_each_entry(vma, &vm->bound_list, vm_link)
1524                 count++;
1525
1526         bo = NULL;
1527         if (count)
1528                 bo = kcalloc(count, sizeof(*bo), GFP_ATOMIC);
1529         if (!bo)
1530                 return;
1531
1532         error->pinned_bo_count =
1533                 capture_error_bo(bo, count, &vm->bound_list, PINNED_ONLY);
1534         error->pinned_bo = bo;
1535 }
1536
1537 static void capture_uc_state(struct i915_gpu_state *error)
1538 {
1539         struct drm_i915_private *i915 = error->i915;
1540         struct i915_error_uc *error_uc = &error->uc;
1541
1542         /* Capturing uC state won't be useful if there is no GuC */
1543         if (!error->device_info.has_guc)
1544                 return;
1545
1546         error_uc->guc_fw = i915->guc.fw;
1547         error_uc->huc_fw = i915->huc.fw;
1548
1549         /* Non-default firmware paths will be specified by the modparam.
1550          * As modparams are generally accesible from the userspace make
1551          * explicit copies of the firmware paths.
1552          */
1553         error_uc->guc_fw.path = kstrdup(i915->guc.fw.path, GFP_ATOMIC);
1554         error_uc->huc_fw.path = kstrdup(i915->huc.fw.path, GFP_ATOMIC);
1555         error_uc->guc_log = i915_error_object_create(i915, i915->guc.log.vma);
1556 }
1557
1558 /* Capture all registers which don't fit into another category. */
1559 static void capture_reg_state(struct i915_gpu_state *error)
1560 {
1561         struct drm_i915_private *dev_priv = error->i915;
1562         int i;
1563
1564         /* General organization
1565          * 1. Registers specific to a single generation
1566          * 2. Registers which belong to multiple generations
1567          * 3. Feature specific registers.
1568          * 4. Everything else
1569          * Please try to follow the order.
1570          */
1571
1572         /* 1: Registers specific to a single generation */
1573         if (IS_VALLEYVIEW(dev_priv)) {
1574                 error->gtier[0] = I915_READ(GTIER);
1575                 error->ier = I915_READ(VLV_IER);
1576                 error->forcewake = I915_READ_FW(FORCEWAKE_VLV);
1577         }
1578
1579         if (IS_GEN(dev_priv, 7))
1580                 error->err_int = I915_READ(GEN7_ERR_INT);
1581
1582         if (INTEL_GEN(dev_priv) >= 8) {
1583                 error->fault_data0 = I915_READ(GEN8_FAULT_TLB_DATA0);
1584                 error->fault_data1 = I915_READ(GEN8_FAULT_TLB_DATA1);
1585         }
1586
1587         if (IS_GEN(dev_priv, 6)) {
1588                 error->forcewake = I915_READ_FW(FORCEWAKE);
1589                 error->gab_ctl = I915_READ(GAB_CTL);
1590                 error->gfx_mode = I915_READ(GFX_MODE);
1591         }
1592
1593         /* 2: Registers which belong to multiple generations */
1594         if (INTEL_GEN(dev_priv) >= 7)
1595                 error->forcewake = I915_READ_FW(FORCEWAKE_MT);
1596
1597         if (INTEL_GEN(dev_priv) >= 6) {
1598                 error->derrmr = I915_READ(DERRMR);
1599                 error->error = I915_READ(ERROR_GEN6);
1600                 error->done_reg = I915_READ(DONE_REG);
1601         }
1602
1603         if (INTEL_GEN(dev_priv) >= 5)
1604                 error->ccid = I915_READ(CCID);
1605
1606         /* 3: Feature specific registers */
1607         if (IS_GEN_RANGE(dev_priv, 6, 7)) {
1608                 error->gam_ecochk = I915_READ(GAM_ECOCHK);
1609                 error->gac_eco = I915_READ(GAC_ECO_BITS);
1610         }
1611
1612         /* 4: Everything else */
1613         if (INTEL_GEN(dev_priv) >= 11) {
1614                 error->ier = I915_READ(GEN8_DE_MISC_IER);
1615                 error->gtier[0] = I915_READ(GEN11_RENDER_COPY_INTR_ENABLE);
1616                 error->gtier[1] = I915_READ(GEN11_VCS_VECS_INTR_ENABLE);
1617                 error->gtier[2] = I915_READ(GEN11_GUC_SG_INTR_ENABLE);
1618                 error->gtier[3] = I915_READ(GEN11_GPM_WGBOXPERF_INTR_ENABLE);
1619                 error->gtier[4] = I915_READ(GEN11_CRYPTO_RSVD_INTR_ENABLE);
1620                 error->gtier[5] = I915_READ(GEN11_GUNIT_CSME_INTR_ENABLE);
1621                 error->ngtier = 6;
1622         } else if (INTEL_GEN(dev_priv) >= 8) {
1623                 error->ier = I915_READ(GEN8_DE_MISC_IER);
1624                 for (i = 0; i < 4; i++)
1625                         error->gtier[i] = I915_READ(GEN8_GT_IER(i));
1626                 error->ngtier = 4;
1627         } else if (HAS_PCH_SPLIT(dev_priv)) {
1628                 error->ier = I915_READ(DEIER);
1629                 error->gtier[0] = I915_READ(GTIER);
1630                 error->ngtier = 1;
1631         } else if (IS_GEN(dev_priv, 2)) {
1632                 error->ier = I915_READ16(IER);
1633         } else if (!IS_VALLEYVIEW(dev_priv)) {
1634                 error->ier = I915_READ(IER);
1635         }
1636         error->eir = I915_READ(EIR);
1637         error->pgtbl_er = I915_READ(PGTBL_ER);
1638 }
1639
1640 static const char *
1641 error_msg(struct i915_gpu_state *error, unsigned long engines, const char *msg)
1642 {
1643         int len;
1644         int i;
1645
1646         for (i = 0; i < ARRAY_SIZE(error->engine); i++)
1647                 if (!error->engine[i].context.pid)
1648                         engines &= ~BIT(i);
1649
1650         len = scnprintf(error->error_msg, sizeof(error->error_msg),
1651                         "GPU HANG: ecode %d:%lx:0x%08x",
1652                         INTEL_GEN(error->i915), engines,
1653                         i915_error_generate_code(error, engines));
1654         if (engines) {
1655                 /* Just show the first executing process, more is confusing */
1656                 i = __ffs(engines);
1657                 len += scnprintf(error->error_msg + len,
1658                                  sizeof(error->error_msg) - len,
1659                                  ", in %s [%d]",
1660                                  error->engine[i].context.comm,
1661                                  error->engine[i].context.pid);
1662         }
1663         if (msg)
1664                 len += scnprintf(error->error_msg + len,
1665                                  sizeof(error->error_msg) - len,
1666                                  ", %s", msg);
1667
1668         return error->error_msg;
1669 }
1670
1671 static void capture_gen_state(struct i915_gpu_state *error)
1672 {
1673         struct drm_i915_private *i915 = error->i915;
1674
1675         error->awake = i915->gt.awake;
1676         error->wakelock = atomic_read(&i915->runtime_pm.wakeref_count);
1677         error->suspended = i915->runtime_pm.suspended;
1678
1679         error->iommu = -1;
1680 #ifdef CONFIG_INTEL_IOMMU
1681         error->iommu = intel_iommu_gfx_mapped;
1682 #endif
1683         error->reset_count = i915_reset_count(&i915->gpu_error);
1684         error->suspend_count = i915->suspend_count;
1685
1686         memcpy(&error->device_info,
1687                INTEL_INFO(i915),
1688                sizeof(error->device_info));
1689         memcpy(&error->runtime_info,
1690                RUNTIME_INFO(i915),
1691                sizeof(error->runtime_info));
1692         error->driver_caps = i915->caps;
1693 }
1694
1695 static void capture_params(struct i915_gpu_state *error)
1696 {
1697         i915_params_copy(&error->params, &i915_modparams);
1698 }
1699
1700 static unsigned long capture_find_epoch(const struct i915_gpu_state *error)
1701 {
1702         unsigned long epoch = error->capture;
1703         int i;
1704
1705         for (i = 0; i < ARRAY_SIZE(error->engine); i++) {
1706                 const struct drm_i915_error_engine *ee = &error->engine[i];
1707
1708                 if (ee->hangcheck_timestamp &&
1709                     time_before(ee->hangcheck_timestamp, epoch))
1710                         epoch = ee->hangcheck_timestamp;
1711         }
1712
1713         return epoch;
1714 }
1715
1716 static void capture_finish(struct i915_gpu_state *error)
1717 {
1718         struct i915_ggtt *ggtt = &error->i915->ggtt;
1719         const u64 slot = ggtt->error_capture.start;
1720
1721         ggtt->vm.clear_range(&ggtt->vm, slot, PAGE_SIZE);
1722 }
1723
1724 static int capture(void *data)
1725 {
1726         struct i915_gpu_state *error = data;
1727
1728         error->time = ktime_get_real();
1729         error->boottime = ktime_get_boottime();
1730         error->uptime = ktime_sub(ktime_get(),
1731                                   error->i915->gt.last_init_time);
1732         error->capture = jiffies;
1733
1734         capture_params(error);
1735         capture_gen_state(error);
1736         capture_uc_state(error);
1737         capture_reg_state(error);
1738         gem_record_fences(error);
1739         gem_record_rings(error);
1740         capture_active_buffers(error);
1741         capture_pinned_buffers(error);
1742
1743         error->overlay = intel_overlay_capture_error_state(error->i915);
1744         error->display = intel_display_capture_error_state(error->i915);
1745
1746         error->epoch = capture_find_epoch(error);
1747
1748         capture_finish(error);
1749         return 0;
1750 }
1751
1752 #define DAY_AS_SECONDS(x) (24 * 60 * 60 * (x))
1753
1754 struct i915_gpu_state *
1755 i915_capture_gpu_state(struct drm_i915_private *i915)
1756 {
1757         struct i915_gpu_state *error;
1758
1759         /* Check if GPU capture has been disabled */
1760         error = READ_ONCE(i915->gpu_error.first_error);
1761         if (IS_ERR(error))
1762                 return error;
1763
1764         error = kzalloc(sizeof(*error), GFP_ATOMIC);
1765         if (!error) {
1766                 i915_disable_error_state(i915, -ENOMEM);
1767                 return ERR_PTR(-ENOMEM);
1768         }
1769
1770         kref_init(&error->ref);
1771         error->i915 = i915;
1772
1773         stop_machine(capture, error, NULL);
1774
1775         return error;
1776 }
1777
1778 /**
1779  * i915_capture_error_state - capture an error record for later analysis
1780  * @i915: i915 device
1781  * @engine_mask: the mask of engines triggering the hang
1782  * @msg: a message to insert into the error capture header
1783  *
1784  * Should be called when an error is detected (either a hang or an error
1785  * interrupt) to capture error state from the time of the error.  Fills
1786  * out a structure which becomes available in debugfs for user level tools
1787  * to pick up.
1788  */
1789 void i915_capture_error_state(struct drm_i915_private *i915,
1790                               unsigned long engine_mask,
1791                               const char *msg)
1792 {
1793         static bool warned;
1794         struct i915_gpu_state *error;
1795         unsigned long flags;
1796
1797         if (!i915_modparams.error_capture)
1798                 return;
1799
1800         if (READ_ONCE(i915->gpu_error.first_error))
1801                 return;
1802
1803         error = i915_capture_gpu_state(i915);
1804         if (IS_ERR(error))
1805                 return;
1806
1807         dev_info(i915->drm.dev, "%s\n", error_msg(error, engine_mask, msg));
1808
1809         if (!error->simulated) {
1810                 spin_lock_irqsave(&i915->gpu_error.lock, flags);
1811                 if (!i915->gpu_error.first_error) {
1812                         i915->gpu_error.first_error = error;
1813                         error = NULL;
1814                 }
1815                 spin_unlock_irqrestore(&i915->gpu_error.lock, flags);
1816         }
1817
1818         if (error) {
1819                 __i915_gpu_state_free(&error->ref);
1820                 return;
1821         }
1822
1823         if (!warned &&
1824             ktime_get_real_seconds() - DRIVER_TIMESTAMP < DAY_AS_SECONDS(180)) {
1825                 DRM_INFO("GPU hangs can indicate a bug anywhere in the entire gfx stack, including userspace.\n");
1826                 DRM_INFO("Please file a _new_ bug report on bugs.freedesktop.org against DRI -> DRM/Intel\n");
1827                 DRM_INFO("drm/i915 developers can then reassign to the right component if it's not a kernel issue.\n");
1828                 DRM_INFO("The gpu crash dump is required to analyze gpu hangs, so please always attach it.\n");
1829                 DRM_INFO("GPU crash dump saved to /sys/class/drm/card%d/error\n",
1830                          i915->drm.primary->index);
1831                 warned = true;
1832         }
1833 }
1834
1835 struct i915_gpu_state *
1836 i915_first_error_state(struct drm_i915_private *i915)
1837 {
1838         struct i915_gpu_state *error;
1839
1840         spin_lock_irq(&i915->gpu_error.lock);
1841         error = i915->gpu_error.first_error;
1842         if (!IS_ERR_OR_NULL(error))
1843                 i915_gpu_state_get(error);
1844         spin_unlock_irq(&i915->gpu_error.lock);
1845
1846         return error;
1847 }
1848
1849 void i915_reset_error_state(struct drm_i915_private *i915)
1850 {
1851         struct i915_gpu_state *error;
1852
1853         spin_lock_irq(&i915->gpu_error.lock);
1854         error = i915->gpu_error.first_error;
1855         if (error != ERR_PTR(-ENODEV)) /* if disabled, always disabled */
1856                 i915->gpu_error.first_error = NULL;
1857         spin_unlock_irq(&i915->gpu_error.lock);
1858
1859         if (!IS_ERR_OR_NULL(error))
1860                 i915_gpu_state_put(error);
1861 }
1862
1863 void i915_disable_error_state(struct drm_i915_private *i915, int err)
1864 {
1865         spin_lock_irq(&i915->gpu_error.lock);
1866         if (!i915->gpu_error.first_error)
1867                 i915->gpu_error.first_error = ERR_PTR(err);
1868         spin_unlock_irq(&i915->gpu_error.lock);
1869 }