drivers/gpu/drm/i915/i915_gpu_error.c

   1 /*
   2  * Copyright (c) 2008 Intel Corporation
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice (including the next
  12  * paragraph) shall be included in all copies or substantial portions of the
  13  * Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  21  * IN THE SOFTWARE.
  22  *
  23  * Authors:
  24  *    Eric Anholt <[email protected]>
  25  *    Keith Packard <[email protected]>
  26  *    Mika Kuoppala <[email protected]>
  27  *
  28  */
  29
  30 #include <linux/ascii85.h>
  31 #include <linux/debugfs.h>
  32 #include <linux/highmem.h>
  33 #include <linux/nmi.h>
  34 #include <linux/pagevec.h>
  35 #include <linux/scatterlist.h>
  36 #include <linux/string_helpers.h>
  37 #include <linux/utsname.h>
  38 #include <linux/zlib.h>
  39
  40 #include <drm/drm_cache.h>
  41 #include <drm/drm_print.h>
  42
  43 #include "display/intel_dmc.h"
  44 #include "display/intel_overlay.h"
  45
  46 #include "gem/i915_gem_context.h"
  47 #include "gem/i915_gem_lmem.h"
  48 #include "gt/intel_engine_regs.h"
  49 #include "gt/intel_gt.h"
  50 #include "gt/intel_gt_mcr.h"
  51 #include "gt/intel_gt_pm.h"
  52 #include "gt/intel_gt_regs.h"
  53 #include "gt/uc/intel_guc_capture.h"
  54
  55 #include "i915_driver.h"
  56 #include "i915_drv.h"
  57 #include "i915_gpu_error.h"
  58 #include "i915_memcpy.h"
  59 #include "i915_reg.h"
  60 #include "i915_scatterlist.h"
  61 #include "i915_sysfs.h"
  62 #include "i915_utils.h"
  63
  64 #define ALLOW_FAIL (__GFP_KSWAPD_RECLAIM | __GFP_RETRY_MAYFAIL | __GFP_NOWARN)
  65 #define ATOMIC_MAYFAIL (GFP_ATOMIC | __GFP_NOWARN)
  66
  67 static void __sg_set_buf(struct scatterlist *sg,
  68                          void *addr, unsigned int len, loff_t it)
  69 {
  70         sg->page_link = (unsigned long)virt_to_page(addr);
  71         sg->offset = offset_in_page(addr);
  72         sg->length = len;
  73         sg->dma_address = it;
  74 }
  75
  76 static bool __i915_error_grow(struct drm_i915_error_state_buf *e, size_t len)
  77 {
  78         if (!len)
  79                 return false;
  80
  81         if (e->bytes + len + 1 <= e->size)
  82                 return true;
  83
  84         if (e->bytes) {
  85                 __sg_set_buf(e->cur++, e->buf, e->bytes, e->iter);
  86                 e->iter += e->bytes;
  87                 e->buf = NULL;
  88                 e->bytes = 0;
  89         }
  90
  91         if (e->cur == e->end) {
  92                 struct scatterlist *sgl;
  93
  94                 sgl = (typeof(sgl))__get_free_page(ALLOW_FAIL);
  95                 if (!sgl) {
  96                         e->err = -ENOMEM;
  97                         return false;
  98                 }
  99
 100                 if (e->cur) {
 101                         e->cur->offset = 0;
 102                         e->cur->length = 0;
 103                         e->cur->page_link =
 104                                 (unsigned long)sgl | SG_CHAIN;
 105                 } else {
 106                         e->sgl = sgl;
 107                 }
 108
 109                 e->cur = sgl;
 110                 e->end = sgl + SG_MAX_SINGLE_ALLOC - 1;
 111         }
 112
 113         e->size = ALIGN(len + 1, SZ_64K);
 114         e->buf = kmalloc(e->size, ALLOW_FAIL);
 115         if (!e->buf) {
 116                 e->size = PAGE_ALIGN(len + 1);
 117                 e->buf = kmalloc(e->size, GFP_KERNEL);
 118         }
 119         if (!e->buf) {
 120                 e->err = -ENOMEM;
 121                 return false;
 122         }
 123
 124         return true;
 125 }
 126
 127 __printf(2, 0)
 128 static void i915_error_vprintf(struct drm_i915_error_state_buf *e,
 129                                const char *fmt, va_list args)
 130 {
 131         va_list ap;
 132         int len;
 133
 134         if (e->err)
 135                 return;
 136
 137         va_copy(ap, args);
 138         len = vsnprintf(NULL, 0, fmt, ap);
 139         va_end(ap);
 140         if (len <= 0) {
 141                 e->err = len;
 142                 return;
 143         }
 144
 145         if (!__i915_error_grow(e, len))
 146                 return;
 147
 148         GEM_BUG_ON(e->bytes >= e->size);
 149         len = vscnprintf(e->buf + e->bytes, e->size - e->bytes, fmt, args);
 150         if (len < 0) {
 151                 e->err = len;
 152                 return;
 153         }
 154         e->bytes += len;
 155 }
 156
 157 static void i915_error_puts(struct drm_i915_error_state_buf *e, const char *str)
 158 {
 159         unsigned len;
 160
 161         if (e->err || !str)
 162                 return;
 163
 164         len = strlen(str);
 165         if (!__i915_error_grow(e, len))
 166                 return;
 167
 168         GEM_BUG_ON(e->bytes + len > e->size);
 169         memcpy(e->buf + e->bytes, str, len);
 170         e->bytes += len;
 171 }
 172
 173 #define err_printf(e, ...) i915_error_printf(e, __VA_ARGS__)
 174 #define err_puts(e, s) i915_error_puts(e, s)
 175
 176 static void __i915_printfn_error(struct drm_printer *p, struct va_format *vaf)
 177 {
 178         i915_error_vprintf(p->arg, vaf->fmt, *vaf->va);
 179 }
 180
 181 static inline struct drm_printer
 182 i915_error_printer(struct drm_i915_error_state_buf *e)
 183 {
 184         struct drm_printer p = {
 185                 .printfn = __i915_printfn_error,
 186                 .arg = e,
 187         };
 188         return p;
 189 }
 190
 191 /* single threaded page allocator with a reserved stash for emergencies */
 192 static void pool_fini(struct folio_batch *fbatch)
 193 {
 194         folio_batch_release(fbatch);
 195 }
 196
 197 static int pool_refill(struct folio_batch *fbatch, gfp_t gfp)
 198 {
 199         while (folio_batch_space(fbatch)) {
 200                 struct folio *folio;
 201
 202                 folio = folio_alloc(gfp, 0);
 203                 if (!folio)
 204                         return -ENOMEM;
 205
 206                 folio_batch_add(fbatch, folio);
 207         }
 208
 209         return 0;
 210 }
 211
 212 static int pool_init(struct folio_batch *fbatch, gfp_t gfp)
 213 {
 214         int err;
 215
 216         folio_batch_init(fbatch);
 217
 218         err = pool_refill(fbatch, gfp);
 219         if (err)
 220                 pool_fini(fbatch);
 221
 222         return err;
 223 }
 224
 225 static void *pool_alloc(struct folio_batch *fbatch, gfp_t gfp)
 226 {
 227         struct folio *folio;
 228
 229         folio = folio_alloc(gfp, 0);
 230         if (!folio && folio_batch_count(fbatch))
 231                 folio = fbatch->folios[--fbatch->nr];
 232
 233         return folio ? folio_address(folio) : NULL;
 234 }
 235
 236 static void pool_free(struct folio_batch *fbatch, void *addr)
 237 {
 238         struct folio *folio = virt_to_folio(addr);
 239
 240         if (folio_batch_space(fbatch))
 241                 folio_batch_add(fbatch, folio);
 242         else
 243                 folio_put(folio);
 244 }
 245
 246 #ifdef CONFIG_DRM_I915_COMPRESS_ERROR
 247
 248 struct i915_vma_compress {
 249         struct folio_batch pool;
 250         struct z_stream_s zstream;
 251         void *tmp;
 252 };
 253
 254 static bool compress_init(struct i915_vma_compress *c)
 255 {
 256         struct z_stream_s *zstream = &c->zstream;
 257
 258         if (pool_init(&c->pool, ALLOW_FAIL))
 259                 return false;
 260
 261         zstream->workspace =
 262                 kmalloc(zlib_deflate_workspacesize(MAX_WBITS, MAX_MEM_LEVEL),
 263                         ALLOW_FAIL);
 264         if (!zstream->workspace) {
 265                 pool_fini(&c->pool);
 266                 return false;
 267         }
 268
 269         c->tmp = NULL;
 270         if (i915_has_memcpy_from_wc())
 271                 c->tmp = pool_alloc(&c->pool, ALLOW_FAIL);
 272
 273         return true;
 274 }
 275
 276 static bool compress_start(struct i915_vma_compress *c)
 277 {
 278         struct z_stream_s *zstream = &c->zstream;
 279         void *workspace = zstream->workspace;
 280
 281         memset(zstream, 0, sizeof(*zstream));
 282         zstream->workspace = workspace;
 283
 284         return zlib_deflateInit(zstream, Z_DEFAULT_COMPRESSION) == Z_OK;
 285 }
 286
 287 static void *compress_next_page(struct i915_vma_compress *c,
 288                                 struct i915_vma_coredump *dst)
 289 {
 290         void *page_addr;
 291         struct page *page;
 292
 293         page_addr = pool_alloc(&c->pool, ALLOW_FAIL);
 294         if (!page_addr)
 295                 return ERR_PTR(-ENOMEM);
 296
 297         page = virt_to_page(page_addr);
 298         list_add_tail(&page->lru, &dst->page_list);
 299         return page_addr;
 300 }
 301
 302 static int compress_page(struct i915_vma_compress *c,
 303                          void *src,
 304                          struct i915_vma_coredump *dst,
 305                          bool wc)
 306 {
 307         struct z_stream_s *zstream = &c->zstream;
 308
 309         zstream->next_in = src;
 310         if (wc && c->tmp && i915_memcpy_from_wc(c->tmp, src, PAGE_SIZE))
 311                 zstream->next_in = c->tmp;
 312         zstream->avail_in = PAGE_SIZE;
 313
 314         do {
 315                 if (zstream->avail_out == 0) {
 316                         zstream->next_out = compress_next_page(c, dst);
 317                         if (IS_ERR(zstream->next_out))
 318                                 return PTR_ERR(zstream->next_out);
 319
 320                         zstream->avail_out = PAGE_SIZE;
 321                 }
 322
 323                 if (zlib_deflate(zstream, Z_NO_FLUSH) != Z_OK)
 324                         return -EIO;
 325
 326                 cond_resched();
 327         } while (zstream->avail_in);
 328
 329         /* Fallback to uncompressed if we increase size? */
 330         if (0 && zstream->total_out > zstream->total_in)
 331                 return -E2BIG;
 332
 333         return 0;
 334 }
 335
 336 static int compress_flush(struct i915_vma_compress *c,
 337                           struct i915_vma_coredump *dst)
 338 {
 339         struct z_stream_s *zstream = &c->zstream;
 340
 341         do {
 342                 switch (zlib_deflate(zstream, Z_FINISH)) {
 343                 case Z_OK: /* more space requested */
 344                         zstream->next_out = compress_next_page(c, dst);
 345                         if (IS_ERR(zstream->next_out))
 346                                 return PTR_ERR(zstream->next_out);
 347
 348                         zstream->avail_out = PAGE_SIZE;
 349                         break;
 350
 351                 case Z_STREAM_END:
 352                         goto end;
 353
 354                 default: /* any error */
 355                         return -EIO;
 356                 }
 357         } while (1);
 358
 359 end:
 360         memset(zstream->next_out, 0, zstream->avail_out);
 361         dst->unused = zstream->avail_out;
 362         return 0;
 363 }
 364
 365 static void compress_finish(struct i915_vma_compress *c)
 366 {
 367         zlib_deflateEnd(&c->zstream);
 368 }
 369
 370 static void compress_fini(struct i915_vma_compress *c)
 371 {
 372         kfree(c->zstream.workspace);
 373         if (c->tmp)
 374                 pool_free(&c->pool, c->tmp);
 375         pool_fini(&c->pool);
 376 }
 377
 378 static void err_compression_marker(struct drm_i915_error_state_buf *m)
 379 {
 380         err_puts(m, ":");
 381 }
 382
 383 #else
 384
 385 struct i915_vma_compress {
 386         struct folio_batch pool;
 387 };
 388
 389 static bool compress_init(struct i915_vma_compress *c)
 390 {
 391         return pool_init(&c->pool, ALLOW_FAIL) == 0;
 392 }
 393
 394 static bool compress_start(struct i915_vma_compress *c)
 395 {
 396         return true;
 397 }
 398
 399 static int compress_page(struct i915_vma_compress *c,
 400                          void *src,
 401                          struct i915_vma_coredump *dst,
 402                          bool wc)
 403 {
 404         void *ptr;
 405
 406         ptr = pool_alloc(&c->pool, ALLOW_FAIL);
 407         if (!ptr)
 408                 return -ENOMEM;
 409
 410         if (!(wc && i915_memcpy_from_wc(ptr, src, PAGE_SIZE)))
 411                 memcpy(ptr, src, PAGE_SIZE);
 412         list_add_tail(&virt_to_page(ptr)->lru, &dst->page_list);
 413         cond_resched();
 414
 415         return 0;
 416 }
 417
 418 static int compress_flush(struct i915_vma_compress *c,
 419                           struct i915_vma_coredump *dst)
 420 {
 421         return 0;
 422 }
 423
 424 static void compress_finish(struct i915_vma_compress *c)
 425 {
 426 }
 427
 428 static void compress_fini(struct i915_vma_compress *c)
 429 {
 430         pool_fini(&c->pool);
 431 }
 432
 433 static void err_compression_marker(struct drm_i915_error_state_buf *m)
 434 {
 435         err_puts(m, "~");
 436 }
 437
 438 #endif
 439
 440 static void error_print_instdone(struct drm_i915_error_state_buf *m,
 441                                  const struct intel_engine_coredump *ee)
 442 {
 443         int slice;
 444         int subslice;
 445         int iter;
 446
 447         err_printf(m, "  INSTDONE: 0x%08x\n",
 448                    ee->instdone.instdone);
 449
 450         if (ee->engine->class != RENDER_CLASS || GRAPHICS_VER(m->i915) <= 3)
 451                 return;
 452
 453         err_printf(m, "  SC_INSTDONE: 0x%08x\n",
 454                    ee->instdone.slice_common);
 455
 456         if (GRAPHICS_VER(m->i915) <= 6)
 457                 return;
 458
 459         for_each_ss_steering(iter, ee->engine->gt, slice, subslice)
 460                 err_printf(m, "  SAMPLER_INSTDONE[%d][%d]: 0x%08x\n",
 461                            slice, subslice,
 462                            ee->instdone.sampler[slice][subslice]);
 463
 464         for_each_ss_steering(iter, ee->engine->gt, slice, subslice)
 465                 err_printf(m, "  ROW_INSTDONE[%d][%d]: 0x%08x\n",
 466                            slice, subslice,
 467                            ee->instdone.row[slice][subslice]);
 468
 469         if (GRAPHICS_VER(m->i915) < 12)
 470                 return;
 471
 472         if (GRAPHICS_VER_FULL(m->i915) >= IP_VER(12, 55)) {
 473                 for_each_ss_steering(iter, ee->engine->gt, slice, subslice)
 474                         err_printf(m, "  GEOM_SVGUNIT_INSTDONE[%d][%d]: 0x%08x\n",
 475                                    slice, subslice,
 476                                    ee->instdone.geom_svg[slice][subslice]);
 477         }
 478
 479         err_printf(m, "  SC_INSTDONE_EXTRA: 0x%08x\n",
 480                    ee->instdone.slice_common_extra[0]);
 481         err_printf(m, "  SC_INSTDONE_EXTRA2: 0x%08x\n",
 482                    ee->instdone.slice_common_extra[1]);
 483 }
 484
 485 static void error_print_request(struct drm_i915_error_state_buf *m,
 486                                 const char *prefix,
 487                                 const struct i915_request_coredump *erq)
 488 {
 489         if (!erq->seqno)
 490                 return;
 491
 492         err_printf(m, "%s pid %d, seqno %8x:%08x%s%s, prio %d, head %08x, tail %08x\n",
 493                    prefix, erq->pid, erq->context, erq->seqno,
 494                    test_bit(DMA_FENCE_FLAG_SIGNALED_BIT,
 495                             &erq->flags) ? "!" : "",
 496                    test_bit(DMA_FENCE_FLAG_ENABLE_SIGNAL_BIT,
 497                             &erq->flags) ? "+" : "",
 498                    erq->sched_attr.priority,
 499                    erq->head, erq->tail);
 500 }
 501
 502 static void error_print_context(struct drm_i915_error_state_buf *m,
 503                                 const char *header,
 504                                 const struct i915_gem_context_coredump *ctx)
 505 {
 506         err_printf(m, "%s%s[%d] prio %d, guilty %d active %d, runtime total %lluns, avg %lluns\n",
 507                    header, ctx->comm, ctx->pid, ctx->sched_attr.priority,
 508                    ctx->guilty, ctx->active,
 509                    ctx->total_runtime, ctx->avg_runtime);
 510         err_printf(m, "  context timeline seqno %u\n", ctx->hwsp_seqno);
 511 }
 512
 513 static struct i915_vma_coredump *
 514 __find_vma(struct i915_vma_coredump *vma, const char *name)
 515 {
 516         while (vma) {
 517                 if (strcmp(vma->name, name) == 0)
 518                         return vma;
 519                 vma = vma->next;
 520         }
 521
 522         return NULL;
 523 }
 524
 525 static struct i915_vma_coredump *
 526 intel_gpu_error_find_batch(const struct intel_engine_coredump *ee)
 527 {
 528         return __find_vma(ee->vma, "batch");
 529 }
 530
 531 static void error_print_engine(struct drm_i915_error_state_buf *m,
 532                                const struct intel_engine_coredump *ee)
 533 {
 534         struct i915_vma_coredump *batch;
 535         int n;
 536
 537         err_printf(m, "%s command stream:\n", ee->engine->name);
 538         err_printf(m, "  CCID:  0x%08x\n", ee->ccid);
 539         err_printf(m, "  START: 0x%08x\n", ee->start);
 540         err_printf(m, "  HEAD:  0x%08x [0x%08x]\n", ee->head, ee->rq_head);
 541         err_printf(m, "  TAIL:  0x%08x [0x%08x, 0x%08x]\n",
 542                    ee->tail, ee->rq_post, ee->rq_tail);
 543         err_printf(m, "  CTL:   0x%08x\n", ee->ctl);
 544         err_printf(m, "  MODE:  0x%08x\n", ee->mode);
 545         err_printf(m, "  HWS:   0x%08x\n", ee->hws);
 546         err_printf(m, "  ACTHD: 0x%08x %08x\n",
 547                    (u32)(ee->acthd>>32), (u32)ee->acthd);
 548         err_printf(m, "  IPEIR: 0x%08x\n", ee->ipeir);
 549         err_printf(m, "  IPEHR: 0x%08x\n", ee->ipehr);
 550         err_printf(m, "  ESR:   0x%08x\n", ee->esr);
 551
 552         error_print_instdone(m, ee);
 553
 554         batch = intel_gpu_error_find_batch(ee);
 555         if (batch) {
 556                 u64 start = batch->gtt_offset;
 557                 u64 end = start + batch->gtt_size;
 558
 559                 err_printf(m, "  batch: [0x%08x_%08x, 0x%08x_%08x]\n",
 560                            upper_32_bits(start), lower_32_bits(start),
 561                            upper_32_bits(end), lower_32_bits(end));
 562         }
 563         if (GRAPHICS_VER(m->i915) >= 4) {
 564                 err_printf(m, "  BBADDR: 0x%08x_%08x\n",
 565                            (u32)(ee->bbaddr>>32), (u32)ee->bbaddr);
 566                 err_printf(m, "  BB_STATE: 0x%08x\n", ee->bbstate);
 567                 err_printf(m, "  INSTPS: 0x%08x\n", ee->instps);
 568         }
 569         err_printf(m, "  INSTPM: 0x%08x\n", ee->instpm);
 570         err_printf(m, "  FADDR: 0x%08x %08x\n", upper_32_bits(ee->faddr),
 571                    lower_32_bits(ee->faddr));
 572         if (GRAPHICS_VER(m->i915) >= 6) {
 573                 err_printf(m, "  RC PSMI: 0x%08x\n", ee->rc_psmi);
 574                 err_printf(m, "  FAULT_REG: 0x%08x\n", ee->fault_reg);
 575         }
 576         if (GRAPHICS_VER(m->i915) >= 11) {
 577                 err_printf(m, "  NOPID: 0x%08x\n", ee->nopid);
 578                 err_printf(m, "  EXCC: 0x%08x\n", ee->excc);
 579                 err_printf(m, "  CMD_CCTL: 0x%08x\n", ee->cmd_cctl);
 580                 err_printf(m, "  CSCMDOP: 0x%08x\n", ee->cscmdop);
 581                 err_printf(m, "  CTX_SR_CTL: 0x%08x\n", ee->ctx_sr_ctl);
 582                 err_printf(m, "  DMA_FADDR_HI: 0x%08x\n", ee->dma_faddr_hi);
 583                 err_printf(m, "  DMA_FADDR_LO: 0x%08x\n", ee->dma_faddr_lo);
 584         }
 585         if (HAS_PPGTT(m->i915)) {
 586                 err_printf(m, "  GFX_MODE: 0x%08x\n", ee->vm_info.gfx_mode);
 587
 588                 if (GRAPHICS_VER(m->i915) >= 8) {
 589                         int i;
 590                         for (i = 0; i < 4; i++)
 591                                 err_printf(m, "  PDP%d: 0x%016llx\n",
 592                                            i, ee->vm_info.pdp[i]);
 593                 } else {
 594                         err_printf(m, "  PP_DIR_BASE: 0x%08x\n",
 595                                    ee->vm_info.pp_dir_base);
 596                 }
 597         }
 598
 599         for (n = 0; n < ee->num_ports; n++) {
 600                 err_printf(m, "  ELSP[%d]:", n);
 601                 error_print_request(m, " ", &ee->execlist[n]);
 602         }
 603 }
 604
 605 void i915_error_printf(struct drm_i915_error_state_buf *e, const char *f, ...)
 606 {
 607         va_list args;
 608
 609         va_start(args, f);
 610         i915_error_vprintf(e, f, args);
 611         va_end(args);
 612 }
 613
 614 static void intel_gpu_error_print_vma(struct drm_i915_error_state_buf *m,
 615                                       const struct intel_engine_cs *engine,
 616                                       const struct i915_vma_coredump *vma)
 617 {
 618         char out[ASCII85_BUFSZ];
 619         struct page *page;
 620
 621         if (!vma)
 622                 return;
 623
 624         err_printf(m, "%s --- %s = 0x%08x %08x\n",
 625                    engine ? engine->name : "global", vma->name,
 626                    upper_32_bits(vma->gtt_offset),
 627                    lower_32_bits(vma->gtt_offset));
 628
 629         if (vma->gtt_page_sizes > I915_GTT_PAGE_SIZE_4K)
 630                 err_printf(m, "gtt_page_sizes = 0x%08x\n", vma->gtt_page_sizes);
 631
 632         err_compression_marker(m);
 633         list_for_each_entry(page, &vma->page_list, lru) {
 634                 int i, len;
 635                 const u32 *addr = page_address(page);
 636
 637                 len = PAGE_SIZE;
 638                 if (page == list_last_entry(&vma->page_list, typeof(*page), lru))
 639                         len -= vma->unused;
 640                 len = ascii85_encode_len(len);
 641
 642                 for (i = 0; i < len; i++)
 643                         err_puts(m, ascii85_encode(addr[i], out));
 644         }
 645         err_puts(m, "\n");
 646 }
 647
 648 static void err_print_capabilities(struct drm_i915_error_state_buf *m,
 649                                    struct i915_gpu_coredump *error)
 650 {
 651         struct drm_printer p = i915_error_printer(m);
 652
 653         intel_device_info_print(&error->device_info, &error->runtime_info, &p);
 654         intel_display_device_info_print(&error->display_device_info,
 655                                         &error->display_runtime_info, &p);
 656         intel_driver_caps_print(&error->driver_caps, &p);
 657 }
 658
 659 static void err_print_params(struct drm_i915_error_state_buf *m,
 660                              const struct i915_params *params)
 661 {
 662         struct drm_printer p = i915_error_printer(m);
 663
 664         i915_params_dump(params, &p);
 665         intel_display_params_dump(m->i915, &p);
 666 }
 667
 668 static void err_print_pciid(struct drm_i915_error_state_buf *m,
 669                             struct drm_i915_private *i915)
 670 {
 671         struct pci_dev *pdev = to_pci_dev(i915->drm.dev);
 672
 673         err_printf(m, "PCI ID: 0x%04x\n", pdev->device);
 674         err_printf(m, "PCI Revision: 0x%02x\n", pdev->revision);
 675         err_printf(m, "PCI Subsystem: %04x:%04x\n",
 676                    pdev->subsystem_vendor,
 677                    pdev->subsystem_device);
 678 }
 679
 680 static void err_print_guc_ctb(struct drm_i915_error_state_buf *m,
 681                               const char *name,
 682                               const struct intel_ctb_coredump *ctb)
 683 {
 684         if (!ctb->size)
 685                 return;
 686
 687         err_printf(m, "GuC %s CTB: raw: 0x%08X, 0x%08X/%08X, cached: 0x%08X/%08X, desc = 0x%08X, buf = 0x%08X x 0x%08X\n",
 688                    name, ctb->raw_status, ctb->raw_head, ctb->raw_tail,
 689                    ctb->head, ctb->tail, ctb->desc_offset, ctb->cmds_offset, ctb->size);
 690 }
 691
 692 static void err_print_uc(struct drm_i915_error_state_buf *m,
 693                          const struct intel_uc_coredump *error_uc)
 694 {
 695         struct drm_printer p = i915_error_printer(m);
 696
 697         intel_uc_fw_dump(&error_uc->guc_fw, &p);
 698         intel_uc_fw_dump(&error_uc->huc_fw, &p);
 699         err_printf(m, "GuC timestamp: 0x%08x\n", error_uc->guc.timestamp);
 700         intel_gpu_error_print_vma(m, NULL, error_uc->guc.vma_log);
 701         err_printf(m, "GuC CTB fence: %d\n", error_uc->guc.last_fence);
 702         err_print_guc_ctb(m, "Send", error_uc->guc.ctb + 0);
 703         err_print_guc_ctb(m, "Recv", error_uc->guc.ctb + 1);
 704         intel_gpu_error_print_vma(m, NULL, error_uc->guc.vma_ctb);
 705 }
 706
 707 static void err_free_sgl(struct scatterlist *sgl)
 708 {
 709         while (sgl) {
 710                 struct scatterlist *sg;
 711
 712                 for (sg = sgl; !sg_is_chain(sg); sg++) {
 713                         kfree(sg_virt(sg));
 714                         if (sg_is_last(sg))
 715                                 break;
 716                 }
 717
 718                 sg = sg_is_last(sg) ? NULL : sg_chain_ptr(sg);
 719                 free_page((unsigned long)sgl);
 720                 sgl = sg;
 721         }
 722 }
 723
 724 static void err_print_gt_info(struct drm_i915_error_state_buf *m,
 725                               struct intel_gt_coredump *gt)
 726 {
 727         struct drm_printer p = i915_error_printer(m);
 728
 729         intel_gt_info_print(&gt->info, &p);
 730         intel_sseu_print_topology(gt->_gt->i915, &gt->info.sseu, &p);
 731 }
 732
 733 static void err_print_gt_display(struct drm_i915_error_state_buf *m,
 734                                  struct intel_gt_coredump *gt)
 735 {
 736         err_printf(m, "IER: 0x%08x\n", gt->ier);
 737         err_printf(m, "DERRMR: 0x%08x\n", gt->derrmr);
 738 }
 739
 740 static void err_print_gt_global_nonguc(struct drm_i915_error_state_buf *m,
 741                                        struct intel_gt_coredump *gt)
 742 {
 743         int i;
 744
 745         err_printf(m, "GT awake: %s\n", str_yes_no(gt->awake));
 746         err_printf(m, "CS timestamp frequency: %u Hz, %d ns\n",
 747                    gt->clock_frequency, gt->clock_period_ns);
 748         err_printf(m, "EIR: 0x%08x\n", gt->eir);
 749         err_printf(m, "PGTBL_ER: 0x%08x\n", gt->pgtbl_er);
 750
 751         for (i = 0; i < gt->ngtier; i++)
 752                 err_printf(m, "GTIER[%d]: 0x%08x\n", i, gt->gtier[i]);
 753 }
 754
 755 static void err_print_gt_global(struct drm_i915_error_state_buf *m,
 756                                 struct intel_gt_coredump *gt)
 757 {
 758         err_printf(m, "FORCEWAKE: 0x%08x\n", gt->forcewake);
 759
 760         if (IS_GRAPHICS_VER(m->i915, 6, 11)) {
 761                 err_printf(m, "ERROR: 0x%08x\n", gt->error);
 762                 err_printf(m, "DONE_REG: 0x%08x\n", gt->done_reg);
 763         }
 764
 765         if (GRAPHICS_VER(m->i915) >= 8)
 766                 err_printf(m, "FAULT_TLB_DATA: 0x%08x 0x%08x\n",
 767                            gt->fault_data1, gt->fault_data0);
 768
 769         if (GRAPHICS_VER(m->i915) == 7)
 770                 err_printf(m, "ERR_INT: 0x%08x\n", gt->err_int);
 771
 772         if (IS_GRAPHICS_VER(m->i915, 8, 11))
 773                 err_printf(m, "GTT_CACHE_EN: 0x%08x\n", gt->gtt_cache);
 774
 775         if (GRAPHICS_VER(m->i915) == 12)
 776                 err_printf(m, "AUX_ERR_DBG: 0x%08x\n", gt->aux_err);
 777
 778         if (GRAPHICS_VER(m->i915) >= 12) {
 779                 int i;
 780
 781                 for (i = 0; i < I915_MAX_SFC; i++) {
 782                         /*
 783                          * SFC_DONE resides in the VD forcewake domain, so it
 784                          * only exists if the corresponding VCS engine is
 785                          * present.
 786                          */
 787                         if ((gt->_gt->info.sfc_mask & BIT(i)) == 0 ||
 788                             !HAS_ENGINE(gt->_gt, _VCS(i * 2)))
 789                                 continue;
 790
 791                         err_printf(m, "  SFC_DONE[%d]: 0x%08x\n", i,
 792                                    gt->sfc_done[i]);
 793                 }
 794
 795                 err_printf(m, "  GAM_DONE: 0x%08x\n", gt->gam_done);
 796         }
 797 }
 798
 799 static void err_print_gt_fences(struct drm_i915_error_state_buf *m,
 800                                 struct intel_gt_coredump *gt)
 801 {
 802         int i;
 803
 804         for (i = 0; i < gt->nfence; i++)
 805                 err_printf(m, "  fence[%d] = %08llx\n", i, gt->fence[i]);
 806 }
 807
 808 static void err_print_gt_engines(struct drm_i915_error_state_buf *m,
 809                                  struct intel_gt_coredump *gt)
 810 {
 811         const struct intel_engine_coredump *ee;
 812
 813         for (ee = gt->engine; ee; ee = ee->next) {
 814                 const struct i915_vma_coredump *vma;
 815
 816                 if (gt->uc && gt->uc->guc.is_guc_capture) {
 817                         if (ee->guc_capture_node)
 818                                 intel_guc_capture_print_engine_node(m, ee);
 819                         else
 820                                 err_printf(m, "  Missing GuC capture node for %s\n",
 821                                            ee->engine->name);
 822                 } else {
 823                         error_print_engine(m, ee);
 824                 }
 825
 826                 err_printf(m, "  hung: %u\n", ee->hung);
 827                 err_printf(m, "  engine reset count: %u\n", ee->reset_count);
 828                 error_print_context(m, "  Active context: ", &ee->context);
 829
 830                 for (vma = ee->vma; vma; vma = vma->next)
 831                         intel_gpu_error_print_vma(m, ee->engine, vma);
 832         }
 833
 834 }
 835
 836 static void __err_print_to_sgl(struct drm_i915_error_state_buf *m,
 837                                struct i915_gpu_coredump *error)
 838 {
 839         const struct intel_engine_coredump *ee;
 840         struct timespec64 ts;
 841
 842         if (*error->error_msg)
 843                 err_printf(m, "%s\n", error->error_msg);
 844         err_printf(m, "Kernel: %s %s\n",
 845                    init_utsname()->release,
 846                    init_utsname()->machine);
 847         err_printf(m, "Driver: %s\n", DRIVER_DATE);
 848         ts = ktime_to_timespec64(error->time);
 849         err_printf(m, "Time: %lld s %ld us\n",
 850                    (s64)ts.tv_sec, ts.tv_nsec / NSEC_PER_USEC);
 851         ts = ktime_to_timespec64(error->boottime);
 852         err_printf(m, "Boottime: %lld s %ld us\n",
 853                    (s64)ts.tv_sec, ts.tv_nsec / NSEC_PER_USEC);
 854         ts = ktime_to_timespec64(error->uptime);
 855         err_printf(m, "Uptime: %lld s %ld us\n",
 856                    (s64)ts.tv_sec, ts.tv_nsec / NSEC_PER_USEC);
 857         err_printf(m, "Capture: %lu jiffies; %d ms ago\n",
 858                    error->capture, jiffies_to_msecs(jiffies - error->capture));
 859
 860         for (ee = error->gt ? error->gt->engine : NULL; ee; ee = ee->next)
 861                 err_printf(m, "Active process (on ring %s): %s [%d]\n",
 862                            ee->engine->name,
 863                            ee->context.comm,
 864                            ee->context.pid);
 865
 866         err_printf(m, "Reset count: %u\n", error->reset_count);
 867         err_printf(m, "Suspend count: %u\n", error->suspend_count);
 868         err_printf(m, "Platform: %s\n", intel_platform_name(error->device_info.platform));
 869         err_printf(m, "Subplatform: 0x%x\n",
 870                    intel_subplatform(&error->runtime_info,
 871                                      error->device_info.platform));
 872         err_print_pciid(m, m->i915);
 873
 874         err_printf(m, "IOMMU enabled?: %d\n", error->iommu);
 875
 876         intel_dmc_print_error_state(m, m->i915);
 877
 878         err_printf(m, "RPM wakelock: %s\n", str_yes_no(error->wakelock));
 879         err_printf(m, "PM suspended: %s\n", str_yes_no(error->suspended));
 880
 881         if (error->gt) {
 882                 bool print_guc_capture = false;
 883
 884                 if (error->gt->uc && error->gt->uc->guc.is_guc_capture)
 885                         print_guc_capture = true;
 886
 887                 err_print_gt_display(m, error->gt);
 888                 err_print_gt_global_nonguc(m, error->gt);
 889                 err_print_gt_fences(m, error->gt);
 890
 891                 /*
 892                  * GuC dumped global, eng-class and eng-instance registers together
 893                  * as part of engine state dump so we print in err_print_gt_engines
 894                  */
 895                 if (!print_guc_capture)
 896                         err_print_gt_global(m, error->gt);
 897
 898                 err_print_gt_engines(m, error->gt);
 899
 900                 if (error->gt->uc)
 901                         err_print_uc(m, error->gt->uc);
 902
 903                 err_print_gt_info(m, error->gt);
 904         }
 905
 906         if (error->overlay)
 907                 intel_overlay_print_error_state(m, error->overlay);
 908
 909         err_print_capabilities(m, error);
 910         err_print_params(m, &error->params);
 911 }
 912
 913 static int err_print_to_sgl(struct i915_gpu_coredump *error)
 914 {
 915         struct drm_i915_error_state_buf m;
 916
 917         if (IS_ERR(error))
 918                 return PTR_ERR(error);
 919
 920         if (READ_ONCE(error->sgl))
 921                 return 0;
 922
 923         memset(&m, 0, sizeof(m));
 924         m.i915 = error->i915;
 925
 926         __err_print_to_sgl(&m, error);
 927
 928         if (m.buf) {
 929                 __sg_set_buf(m.cur++, m.buf, m.bytes, m.iter);
 930                 m.bytes = 0;
 931                 m.buf = NULL;
 932         }
 933         if (m.cur) {
 934                 GEM_BUG_ON(m.end < m.cur);
 935                 sg_mark_end(m.cur - 1);
 936         }
 937         GEM_BUG_ON(m.sgl && !m.cur);
 938
 939         if (m.err) {
 940                 err_free_sgl(m.sgl);
 941                 return m.err;
 942         }
 943
 944         if (cmpxchg(&error->sgl, NULL, m.sgl))
 945                 err_free_sgl(m.sgl);
 946
 947         return 0;
 948 }
 949
 950 ssize_t i915_gpu_coredump_copy_to_buffer(struct i915_gpu_coredump *error,
 951                                          char *buf, loff_t off, size_t rem)
 952 {
 953         struct scatterlist *sg;
 954         size_t count;
 955         loff_t pos;
 956         int err;
 957
 958         if (!error || !rem)
 959                 return 0;
 960
 961         err = err_print_to_sgl(error);
 962         if (err)
 963                 return err;
 964
 965         sg = READ_ONCE(error->fit);
 966         if (!sg || off < sg->dma_address)
 967                 sg = error->sgl;
 968         if (!sg)
 969                 return 0;
 970
 971         pos = sg->dma_address;
 972         count = 0;
 973         do {
 974                 size_t len, start;
 975
 976                 if (sg_is_chain(sg)) {
 977                         sg = sg_chain_ptr(sg);
 978                         GEM_BUG_ON(sg_is_chain(sg));
 979                 }
 980
 981                 len = sg->length;
 982                 if (pos + len <= off) {
 983                         pos += len;
 984                         continue;
 985                 }
 986
 987                 start = sg->offset;
 988                 if (pos < off) {
 989                         GEM_BUG_ON(off - pos > len);
 990                         len -= off - pos;
 991                         start += off - pos;
 992                         pos = off;
 993                 }
 994
 995                 len = min(len, rem);
 996                 GEM_BUG_ON(!len || len > sg->length);
 997
 998                 memcpy(buf, page_address(sg_page(sg)) + start, len);
 999
1000                 count += len;
1001                 pos += len;
1002
1003                 buf += len;
1004                 rem -= len;
1005                 if (!rem) {
1006                         WRITE_ONCE(error->fit, sg);
1007                         break;
1008                 }
1009         } while (!sg_is_last(sg++));
1010
1011         return count;
1012 }
1013
1014 static void i915_vma_coredump_free(struct i915_vma_coredump *vma)
1015 {
1016         while (vma) {
1017                 struct i915_vma_coredump *next = vma->next;
1018                 struct page *page, *n;
1019
1020                 list_for_each_entry_safe(page, n, &vma->page_list, lru) {
1021                         list_del_init(&page->lru);
1022                         __free_page(page);
1023                 }
1024
1025                 kfree(vma);
1026                 vma = next;
1027         }
1028 }
1029
1030 static void cleanup_params(struct i915_gpu_coredump *error)
1031 {
1032         i915_params_free(&error->params);
1033         intel_display_params_free(&error->display_params);
1034 }
1035
1036 static void cleanup_uc(struct intel_uc_coredump *uc)
1037 {
1038         kfree(uc->guc_fw.file_selected.path);
1039         kfree(uc->huc_fw.file_selected.path);
1040         kfree(uc->guc_fw.file_wanted.path);
1041         kfree(uc->huc_fw.file_wanted.path);
1042         i915_vma_coredump_free(uc->guc.vma_log);
1043         i915_vma_coredump_free(uc->guc.vma_ctb);
1044
1045         kfree(uc);
1046 }
1047
1048 static void cleanup_gt(struct intel_gt_coredump *gt)
1049 {
1050         while (gt->engine) {
1051                 struct intel_engine_coredump *ee = gt->engine;
1052
1053                 gt->engine = ee->next;
1054
1055                 i915_vma_coredump_free(ee->vma);
1056                 intel_guc_capture_free_node(ee);
1057                 kfree(ee);
1058         }
1059
1060         if (gt->uc)
1061                 cleanup_uc(gt->uc);
1062
1063         kfree(gt);
1064 }
1065
1066 void __i915_gpu_coredump_free(struct kref *error_ref)
1067 {
1068         struct i915_gpu_coredump *error =
1069                 container_of(error_ref, typeof(*error), ref);
1070
1071         while (error->gt) {
1072                 struct intel_gt_coredump *gt = error->gt;
1073
1074                 error->gt = gt->next;
1075                 cleanup_gt(gt);
1076         }
1077
1078         kfree(error->overlay);
1079
1080         cleanup_params(error);
1081
1082         err_free_sgl(error->sgl);
1083         kfree(error);
1084 }
1085
1086 static struct i915_vma_coredump *
1087 i915_vma_coredump_create(const struct intel_gt *gt,
1088                          const struct i915_vma_resource *vma_res,
1089                          struct i915_vma_compress *compress,
1090                          const char *name)
1091
1092 {
1093         struct i915_ggtt *ggtt = gt->ggtt;
1094         const u64 slot = ggtt->error_capture.start;
1095         struct i915_vma_coredump *dst;
1096         struct sgt_iter iter;
1097         int ret;
1098
1099         might_sleep();
1100
1101         if (!vma_res || !vma_res->bi.pages || !compress)
1102                 return NULL;
1103
1104         dst = kmalloc(sizeof(*dst), ALLOW_FAIL);
1105         if (!dst)
1106                 return NULL;
1107
1108         if (!compress_start(compress)) {
1109                 kfree(dst);
1110                 return NULL;
1111         }
1112
1113         INIT_LIST_HEAD(&dst->page_list);
1114         strcpy(dst->name, name);
1115         dst->next = NULL;
1116
1117         dst->gtt_offset = vma_res->start;
1118         dst->gtt_size = vma_res->node_size;
1119         dst->gtt_page_sizes = vma_res->page_sizes_gtt;
1120         dst->unused = 0;
1121
1122         ret = -EINVAL;
1123         if (drm_mm_node_allocated(&ggtt->error_capture)) {
1124                 void __iomem *s;
1125                 dma_addr_t dma;
1126
1127                 for_each_sgt_daddr(dma, iter, vma_res->bi.pages) {
1128                         mutex_lock(&ggtt->error_mutex);
1129                         if (ggtt->vm.raw_insert_page)
1130                                 ggtt->vm.raw_insert_page(&ggtt->vm, dma, slot,
1131                                                          i915_gem_get_pat_index(gt->i915,
1132                                                                                 I915_CACHE_NONE),
1133                                                          0);
1134                         else
1135                                 ggtt->vm.insert_page(&ggtt->vm, dma, slot,
1136                                                      i915_gem_get_pat_index(gt->i915,
1137                                                                             I915_CACHE_NONE),
1138                                                      0);
1139                         mb();
1140
1141                         s = io_mapping_map_wc(&ggtt->iomap, slot, PAGE_SIZE);
1142                         ret = compress_page(compress,
1143                                             (void  __force *)s, dst,
1144                                             true);
1145                         io_mapping_unmap(s);
1146
1147                         mb();
1148                         ggtt->vm.clear_range(&ggtt->vm, slot, PAGE_SIZE);
1149                         mutex_unlock(&ggtt->error_mutex);
1150                         if (ret)
1151                                 break;
1152                 }
1153         } else if (vma_res->bi.lmem) {
1154                 struct intel_memory_region *mem = vma_res->mr;
1155                 dma_addr_t dma;
1156
1157                 for_each_sgt_daddr(dma, iter, vma_res->bi.pages) {
1158                         dma_addr_t offset = dma - mem->region.start;
1159                         void __iomem *s;
1160
1161                         if (offset + PAGE_SIZE > resource_size(&mem->io)) {
1162                                 ret = -EINVAL;
1163                                 break;
1164                         }
1165
1166                         s = io_mapping_map_wc(&mem->iomap, offset, PAGE_SIZE);
1167                         ret = compress_page(compress,
1168                                             (void __force *)s, dst,
1169                                             true);
1170                         io_mapping_unmap(s);
1171                         if (ret)
1172                                 break;
1173                 }
1174         } else {
1175                 struct page *page;
1176
1177                 for_each_sgt_page(page, iter, vma_res->bi.pages) {
1178                         void *s;
1179
1180                         drm_clflush_pages(&page, 1);
1181
1182                         s = kmap_local_page(page);
1183                         ret = compress_page(compress, s, dst, false);
1184                         kunmap_local(s);
1185
1186                         drm_clflush_pages(&page, 1);
1187
1188                         if (ret)
1189                                 break;
1190                 }
1191         }
1192
1193         if (ret || compress_flush(compress, dst)) {
1194                 struct page *page, *n;
1195
1196                 list_for_each_entry_safe_reverse(page, n, &dst->page_list, lru) {
1197                         list_del_init(&page->lru);
1198                         pool_free(&compress->pool, page_address(page));
1199                 }
1200
1201                 kfree(dst);
1202                 dst = NULL;
1203         }
1204         compress_finish(compress);
1205
1206         return dst;
1207 }
1208
1209 static void gt_record_fences(struct intel_gt_coredump *gt)
1210 {
1211         struct i915_ggtt *ggtt = gt->_gt->ggtt;
1212         struct intel_uncore *uncore = gt->_gt->uncore;
1213         int i;
1214
1215         if (GRAPHICS_VER(uncore->i915) >= 6) {
1216                 for (i = 0; i < ggtt->num_fences; i++)
1217                         gt->fence[i] =
1218                                 intel_uncore_read64(uncore,
1219                                                     FENCE_REG_GEN6_LO(i));
1220         } else if (GRAPHICS_VER(uncore->i915) >= 4) {
1221                 for (i = 0; i < ggtt->num_fences; i++)
1222                         gt->fence[i] =
1223                                 intel_uncore_read64(uncore,
1224                                                     FENCE_REG_965_LO(i));
1225         } else {
1226                 for (i = 0; i < ggtt->num_fences; i++)
1227                         gt->fence[i] =
1228                                 intel_uncore_read(uncore, FENCE_REG(i));
1229         }
1230         gt->nfence = i;
1231 }
1232
1233 static void engine_record_registers(struct intel_engine_coredump *ee)
1234 {
1235         const struct intel_engine_cs *engine = ee->engine;
1236         struct drm_i915_private *i915 = engine->i915;
1237
1238         if (GRAPHICS_VER(i915) >= 6) {
1239                 ee->rc_psmi = ENGINE_READ(engine, RING_PSMI_CTL);
1240
1241                 /*
1242                  * For the media GT, this ring fault register is not replicated,
1243                  * so don't do multicast/replicated register read/write
1244                  * operation on it.
1245                  */
1246                 if (MEDIA_VER(i915) >= 13 && engine->gt->type == GT_MEDIA)
1247                         ee->fault_reg = intel_uncore_read(engine->uncore,
1248                                                           XELPMP_RING_FAULT_REG);
1249                 else if (GRAPHICS_VER_FULL(i915) >= IP_VER(12, 55))
1250                         ee->fault_reg = intel_gt_mcr_read_any(engine->gt,
1251                                                               XEHP_RING_FAULT_REG);
1252                 else if (GRAPHICS_VER(i915) >= 12)
1253                         ee->fault_reg = intel_uncore_read(engine->uncore,
1254                                                           GEN12_RING_FAULT_REG);
1255                 else if (GRAPHICS_VER(i915) >= 8)
1256                         ee->fault_reg = intel_uncore_read(engine->uncore,
1257                                                           GEN8_RING_FAULT_REG);
1258                 else
1259                         ee->fault_reg = GEN6_RING_FAULT_REG_READ(engine);
1260         }
1261
1262         if (GRAPHICS_VER(i915) >= 4) {
1263                 ee->esr = ENGINE_READ(engine, RING_ESR);
1264                 ee->faddr = ENGINE_READ(engine, RING_DMA_FADD);
1265                 ee->ipeir = ENGINE_READ(engine, RING_IPEIR);
1266                 ee->ipehr = ENGINE_READ(engine, RING_IPEHR);
1267                 ee->instps = ENGINE_READ(engine, RING_INSTPS);
1268                 ee->bbaddr = ENGINE_READ(engine, RING_BBADDR);
1269                 ee->ccid = ENGINE_READ(engine, CCID);
1270                 if (GRAPHICS_VER(i915) >= 8) {
1271                         ee->faddr |= (u64)ENGINE_READ(engine, RING_DMA_FADD_UDW) << 32;
1272                         ee->bbaddr |= (u64)ENGINE_READ(engine, RING_BBADDR_UDW) << 32;
1273                 }
1274                 ee->bbstate = ENGINE_READ(engine, RING_BBSTATE);
1275         } else {
1276                 ee->faddr = ENGINE_READ(engine, DMA_FADD_I8XX);
1277                 ee->ipeir = ENGINE_READ(engine, IPEIR);
1278                 ee->ipehr = ENGINE_READ(engine, IPEHR);
1279         }
1280
1281         if (GRAPHICS_VER(i915) >= 11) {
1282                 ee->cmd_cctl = ENGINE_READ(engine, RING_CMD_CCTL);
1283                 ee->cscmdop = ENGINE_READ(engine, RING_CSCMDOP);
1284                 ee->ctx_sr_ctl = ENGINE_READ(engine, RING_CTX_SR_CTL);
1285                 ee->dma_faddr_hi = ENGINE_READ(engine, RING_DMA_FADD_UDW);
1286                 ee->dma_faddr_lo = ENGINE_READ(engine, RING_DMA_FADD);
1287                 ee->nopid = ENGINE_READ(engine, RING_NOPID);
1288                 ee->excc = ENGINE_READ(engine, RING_EXCC);
1289         }
1290
1291         intel_engine_get_instdone(engine, &ee->instdone);
1292
1293         ee->instpm = ENGINE_READ(engine, RING_INSTPM);
1294         ee->acthd = intel_engine_get_active_head(engine);
1295         ee->start = ENGINE_READ(engine, RING_START);
1296         ee->head = ENGINE_READ(engine, RING_HEAD);
1297         ee->tail = ENGINE_READ(engine, RING_TAIL);
1298         ee->ctl = ENGINE_READ(engine, RING_CTL);
1299         if (GRAPHICS_VER(i915) > 2)
1300                 ee->mode = ENGINE_READ(engine, RING_MI_MODE);
1301
1302         if (!HWS_NEEDS_PHYSICAL(i915)) {
1303                 i915_reg_t mmio;
1304
1305                 if (GRAPHICS_VER(i915) == 7) {
1306                         switch (engine->id) {
1307                         default:
1308                                 MISSING_CASE(engine->id);
1309                                 fallthrough;
1310                         case RCS0:
1311                                 mmio = RENDER_HWS_PGA_GEN7;
1312                                 break;
1313                         case BCS0:
1314                                 mmio = BLT_HWS_PGA_GEN7;
1315                                 break;
1316                         case VCS0:
1317                                 mmio = BSD_HWS_PGA_GEN7;
1318                                 break;
1319                         case VECS0:
1320                                 mmio = VEBOX_HWS_PGA_GEN7;
1321                                 break;
1322                         }
1323                 } else if (GRAPHICS_VER(engine->i915) == 6) {
1324                         mmio = RING_HWS_PGA_GEN6(engine->mmio_base);
1325                 } else {
1326                         /* XXX: gen8 returns to sanity */
1327                         mmio = RING_HWS_PGA(engine->mmio_base);
1328                 }
1329
1330                 ee->hws = intel_uncore_read(engine->uncore, mmio);
1331         }
1332
1333         ee->reset_count = i915_reset_engine_count(&i915->gpu_error, engine);
1334
1335         if (HAS_PPGTT(i915)) {
1336                 int i;
1337
1338                 ee->vm_info.gfx_mode = ENGINE_READ(engine, RING_MODE_GEN7);
1339
1340                 if (GRAPHICS_VER(i915) == 6) {
1341                         ee->vm_info.pp_dir_base =
1342                                 ENGINE_READ(engine, RING_PP_DIR_BASE_READ);
1343                 } else if (GRAPHICS_VER(i915) == 7) {
1344                         ee->vm_info.pp_dir_base =
1345                                 ENGINE_READ(engine, RING_PP_DIR_BASE);
1346                 } else if (GRAPHICS_VER(i915) >= 8) {
1347                         u32 base = engine->mmio_base;
1348
1349                         for (i = 0; i < 4; i++) {
1350                                 ee->vm_info.pdp[i] =
1351                                         intel_uncore_read(engine->uncore,
1352                                                           GEN8_RING_PDP_UDW(base, i));
1353                                 ee->vm_info.pdp[i] <<= 32;
1354                                 ee->vm_info.pdp[i] |=
1355                                         intel_uncore_read(engine->uncore,
1356                                                           GEN8_RING_PDP_LDW(base, i));
1357                         }
1358                 }
1359         }
1360 }
1361
1362 static void record_request(const struct i915_request *request,
1363                            struct i915_request_coredump *erq)
1364 {
1365         erq->flags = request->fence.flags;
1366         erq->context = request->fence.context;
1367         erq->seqno = request->fence.seqno;
1368         erq->sched_attr = request->sched.attr;
1369         erq->head = request->head;
1370         erq->tail = request->tail;
1371
1372         erq->pid = 0;
1373         rcu_read_lock();
1374         if (!intel_context_is_closed(request->context)) {
1375                 const struct i915_gem_context *ctx;
1376
1377                 ctx = rcu_dereference(request->context->gem_context);
1378                 if (ctx)
1379                         erq->pid = pid_nr(ctx->pid);
1380         }
1381         rcu_read_unlock();
1382 }
1383
1384 static void engine_record_execlists(struct intel_engine_coredump *ee)
1385 {
1386         const struct intel_engine_execlists * const el = &ee->engine->execlists;
1387         struct i915_request * const *port = el->active;
1388         unsigned int n = 0;
1389
1390         while (*port)
1391                 record_request(*port++, &ee->execlist[n++]);
1392
1393         ee->num_ports = n;
1394 }
1395
1396 static bool record_context(struct i915_gem_context_coredump *e,
1397                            struct intel_context *ce)
1398 {
1399         struct i915_gem_context *ctx;
1400         struct task_struct *task;
1401         bool simulated;
1402
1403         rcu_read_lock();
1404         ctx = rcu_dereference(ce->gem_context);
1405         if (ctx && !kref_get_unless_zero(&ctx->ref))
1406                 ctx = NULL;
1407         rcu_read_unlock();
1408         if (!ctx)
1409                 return true;
1410
1411         rcu_read_lock();
1412         task = pid_task(ctx->pid, PIDTYPE_PID);
1413         if (task) {
1414                 strcpy(e->comm, task->comm);
1415                 e->pid = task->pid;
1416         }
1417         rcu_read_unlock();
1418
1419         e->sched_attr = ctx->sched;
1420         e->guilty = atomic_read(&ctx->guilty_count);
1421         e->active = atomic_read(&ctx->active_count);
1422         e->hwsp_seqno = (ce->timeline && ce->timeline->hwsp_seqno) ?
1423                                 *ce->timeline->hwsp_seqno : ~0U;
1424
1425         e->total_runtime = intel_context_get_total_runtime_ns(ce);
1426         e->avg_runtime = intel_context_get_avg_runtime_ns(ce);
1427
1428         simulated = i915_gem_context_no_error_capture(ctx);
1429
1430         i915_gem_context_put(ctx);
1431         return simulated;
1432 }
1433
1434 struct intel_engine_capture_vma {
1435         struct intel_engine_capture_vma *next;
1436         struct i915_vma_resource *vma_res;
1437         char name[16];
1438         bool lockdep_cookie;
1439 };
1440
1441 static struct intel_engine_capture_vma *
1442 capture_vma_snapshot(struct intel_engine_capture_vma *next,
1443                      struct i915_vma_resource *vma_res,
1444                      gfp_t gfp, const char *name)
1445 {
1446         struct intel_engine_capture_vma *c;
1447
1448         if (!vma_res)
1449                 return next;
1450
1451         c = kmalloc(sizeof(*c), gfp);
1452         if (!c)
1453                 return next;
1454
1455         if (!i915_vma_resource_hold(vma_res, &c->lockdep_cookie)) {
1456                 kfree(c);
1457                 return next;
1458         }
1459
1460         strcpy(c->name, name);
1461         c->vma_res = i915_vma_resource_get(vma_res);
1462
1463         c->next = next;
1464         return c;
1465 }
1466
1467 static struct intel_engine_capture_vma *
1468 capture_vma(struct intel_engine_capture_vma *next,
1469             struct i915_vma *vma,
1470             const char *name,
1471             gfp_t gfp)
1472 {
1473         if (!vma)
1474                 return next;
1475
1476         /*
1477          * If the vma isn't pinned, then the vma should be snapshotted
1478          * to a struct i915_vma_snapshot at command submission time.
1479          * Not here.
1480          */
1481         if (GEM_WARN_ON(!i915_vma_is_pinned(vma)))
1482                 return next;
1483
1484         next = capture_vma_snapshot(next, vma->resource, gfp, name);
1485
1486         return next;
1487 }
1488
1489 static struct intel_engine_capture_vma *
1490 capture_user(struct intel_engine_capture_vma *capture,
1491              const struct i915_request *rq,
1492              gfp_t gfp)
1493 {
1494         struct i915_capture_list *c;
1495
1496         for (c = rq->capture_list; c; c = c->next)
1497                 capture = capture_vma_snapshot(capture, c->vma_res, gfp,
1498                                                "user");
1499
1500         return capture;
1501 }
1502
1503 static void add_vma(struct intel_engine_coredump *ee,
1504                     struct i915_vma_coredump *vma)
1505 {
1506         if (vma) {
1507                 vma->next = ee->vma;
1508                 ee->vma = vma;
1509         }
1510 }
1511
1512 static struct i915_vma_coredump *
1513 create_vma_coredump(const struct intel_gt *gt, struct i915_vma *vma,
1514                     const char *name, struct i915_vma_compress *compress)
1515 {
1516         struct i915_vma_coredump *ret = NULL;
1517         struct i915_vma_resource *vma_res;
1518         bool lockdep_cookie;
1519
1520         if (!vma)
1521                 return NULL;
1522
1523         vma_res = vma->resource;
1524
1525         if (i915_vma_resource_hold(vma_res, &lockdep_cookie)) {
1526                 ret = i915_vma_coredump_create(gt, vma_res, compress, name);
1527                 i915_vma_resource_unhold(vma_res, lockdep_cookie);
1528         }
1529
1530         return ret;
1531 }
1532
1533 static void add_vma_coredump(struct intel_engine_coredump *ee,
1534                              const struct intel_gt *gt,
1535                              struct i915_vma *vma,
1536                              const char *name,
1537                              struct i915_vma_compress *compress)
1538 {
1539         add_vma(ee, create_vma_coredump(gt, vma, name, compress));
1540 }
1541
1542 struct intel_engine_coredump *
1543 intel_engine_coredump_alloc(struct intel_engine_cs *engine, gfp_t gfp, u32 dump_flags)
1544 {
1545         struct intel_engine_coredump *ee;
1546
1547         ee = kzalloc(sizeof(*ee), gfp);
1548         if (!ee)
1549                 return NULL;
1550
1551         ee->engine = engine;
1552
1553         if (!(dump_flags & CORE_DUMP_FLAG_IS_GUC_CAPTURE)) {
1554                 engine_record_registers(ee);
1555                 engine_record_execlists(ee);
1556         }
1557
1558         return ee;
1559 }
1560
1561 static struct intel_engine_capture_vma *
1562 engine_coredump_add_context(struct intel_engine_coredump *ee,
1563                             struct intel_context *ce,
1564                             gfp_t gfp)
1565 {
1566         struct intel_engine_capture_vma *vma = NULL;
1567
1568         ee->simulated |= record_context(&ee->context, ce);
1569         if (ee->simulated)
1570                 return NULL;
1571
1572         /*
1573          * We need to copy these to an anonymous buffer
1574          * as the simplest method to avoid being overwritten
1575          * by userspace.
1576          */
1577         vma = capture_vma(vma, ce->ring->vma, "ring", gfp);
1578         vma = capture_vma(vma, ce->state, "HW context", gfp);
1579
1580         return vma;
1581 }
1582
1583 struct intel_engine_capture_vma *
1584 intel_engine_coredump_add_request(struct intel_engine_coredump *ee,
1585                                   struct i915_request *rq,
1586                                   gfp_t gfp)
1587 {
1588         struct intel_engine_capture_vma *vma;
1589
1590         vma = engine_coredump_add_context(ee, rq->context, gfp);
1591         if (!vma)
1592                 return NULL;
1593
1594         /*
1595          * We need to copy these to an anonymous buffer
1596          * as the simplest method to avoid being overwritten
1597          * by userspace.
1598          */
1599         vma = capture_vma_snapshot(vma, rq->batch_res, gfp, "batch");
1600         vma = capture_user(vma, rq, gfp);
1601
1602         ee->rq_head = rq->head;
1603         ee->rq_post = rq->postfix;
1604         ee->rq_tail = rq->tail;
1605
1606         return vma;
1607 }
1608
1609 void
1610 intel_engine_coredump_add_vma(struct intel_engine_coredump *ee,
1611                               struct intel_engine_capture_vma *capture,
1612                               struct i915_vma_compress *compress)
1613 {
1614         const struct intel_engine_cs *engine = ee->engine;
1615
1616         while (capture) {
1617                 struct intel_engine_capture_vma *this = capture;
1618                 struct i915_vma_resource *vma_res = this->vma_res;
1619
1620                 add_vma(ee,
1621                         i915_vma_coredump_create(engine->gt, vma_res,
1622                                                  compress, this->name));
1623
1624                 i915_vma_resource_unhold(vma_res, this->lockdep_cookie);
1625                 i915_vma_resource_put(vma_res);
1626
1627                 capture = this->next;
1628                 kfree(this);
1629         }
1630
1631         add_vma_coredump(ee, engine->gt, engine->status_page.vma,
1632                          "HW Status", compress);
1633
1634         add_vma_coredump(ee, engine->gt, engine->wa_ctx.vma,
1635                          "WA context", compress);
1636 }
1637
1638 static struct intel_engine_coredump *
1639 capture_engine(struct intel_engine_cs *engine,
1640                struct i915_vma_compress *compress,
1641                u32 dump_flags)
1642 {
1643         struct intel_engine_capture_vma *capture = NULL;
1644         struct intel_engine_coredump *ee;
1645         struct intel_context *ce = NULL;
1646         struct i915_request *rq = NULL;
1647
1648         ee = intel_engine_coredump_alloc(engine, ALLOW_FAIL, dump_flags);
1649         if (!ee)
1650                 return NULL;
1651
1652         intel_engine_get_hung_entity(engine, &ce, &rq);
1653         if (rq && !i915_request_started(rq))
1654                 drm_info(&engine->gt->i915->drm, "Got hung context on %s with active request %lld:%lld [0x%04X] not yet started\n",
1655                          engine->name, rq->fence.context, rq->fence.seqno, ce->guc_id.id);
1656
1657         if (rq) {
1658                 capture = intel_engine_coredump_add_request(ee, rq, ATOMIC_MAYFAIL);
1659                 i915_request_put(rq);
1660         } else if (ce) {
1661                 capture = engine_coredump_add_context(ee, ce, ATOMIC_MAYFAIL);
1662         }
1663
1664         if (capture) {
1665                 intel_engine_coredump_add_vma(ee, capture, compress);
1666
1667                 if (dump_flags & CORE_DUMP_FLAG_IS_GUC_CAPTURE)
1668                         intel_guc_capture_get_matching_node(engine->gt, ee, ce);
1669         } else {
1670                 kfree(ee);
1671                 ee = NULL;
1672         }
1673
1674         return ee;
1675 }
1676
1677 static void
1678 gt_record_engines(struct intel_gt_coredump *gt,
1679                   intel_engine_mask_t engine_mask,
1680                   struct i915_vma_compress *compress,
1681                   u32 dump_flags)
1682 {
1683         struct intel_engine_cs *engine;
1684         enum intel_engine_id id;
1685
1686         for_each_engine(engine, gt->_gt, id) {
1687                 struct intel_engine_coredump *ee;
1688
1689                 /* Refill our page pool before entering atomic section */
1690                 pool_refill(&compress->pool, ALLOW_FAIL);
1691
1692                 ee = capture_engine(engine, compress, dump_flags);
1693                 if (!ee)
1694                         continue;
1695
1696                 ee->hung = engine->mask & engine_mask;
1697
1698                 gt->simulated |= ee->simulated;
1699                 if (ee->simulated) {
1700                         if (dump_flags & CORE_DUMP_FLAG_IS_GUC_CAPTURE)
1701                                 intel_guc_capture_free_node(ee);
1702                         kfree(ee);
1703                         continue;
1704                 }
1705
1706                 ee->next = gt->engine;
1707                 gt->engine = ee;
1708         }
1709 }
1710
1711 static void gt_record_guc_ctb(struct intel_ctb_coredump *saved,
1712                               const struct intel_guc_ct_buffer *ctb,
1713                               const void *blob_ptr, struct intel_guc *guc)
1714 {
1715         if (!ctb || !ctb->desc)
1716                 return;
1717
1718         saved->raw_status = ctb->desc->status;
1719         saved->raw_head = ctb->desc->head;
1720         saved->raw_tail = ctb->desc->tail;
1721         saved->head = ctb->head;
1722         saved->tail = ctb->tail;
1723         saved->size = ctb->size;
1724         saved->desc_offset = ((void *)ctb->desc) - blob_ptr;
1725         saved->cmds_offset = ((void *)ctb->cmds) - blob_ptr;
1726 }
1727
1728 static struct intel_uc_coredump *
1729 gt_record_uc(struct intel_gt_coredump *gt,
1730              struct i915_vma_compress *compress)
1731 {
1732         const struct intel_uc *uc = &gt->_gt->uc;
1733         struct intel_uc_coredump *error_uc;
1734
1735         error_uc = kzalloc(sizeof(*error_uc), ALLOW_FAIL);
1736         if (!error_uc)
1737                 return NULL;
1738
1739         memcpy(&error_uc->guc_fw, &uc->guc.fw, sizeof(uc->guc.fw));
1740         memcpy(&error_uc->huc_fw, &uc->huc.fw, sizeof(uc->huc.fw));
1741
1742         error_uc->guc_fw.file_selected.path = kstrdup(uc->guc.fw.file_selected.path, ALLOW_FAIL);
1743         error_uc->huc_fw.file_selected.path = kstrdup(uc->huc.fw.file_selected.path, ALLOW_FAIL);
1744         error_uc->guc_fw.file_wanted.path = kstrdup(uc->guc.fw.file_wanted.path, ALLOW_FAIL);
1745         error_uc->huc_fw.file_wanted.path = kstrdup(uc->huc.fw.file_wanted.path, ALLOW_FAIL);
1746
1747         /*
1748          * Save the GuC log and include a timestamp reference for converting the
1749          * log times to system times (in conjunction with the error->boottime and
1750          * gt->clock_frequency fields saved elsewhere).
1751          */
1752         error_uc->guc.timestamp = intel_uncore_read(gt->_gt->uncore, GUCPMTIMESTAMP);
1753         error_uc->guc.vma_log = create_vma_coredump(gt->_gt, uc->guc.log.vma,
1754                                                     "GuC log buffer", compress);
1755         error_uc->guc.vma_ctb = create_vma_coredump(gt->_gt, uc->guc.ct.vma,
1756                                                     "GuC CT buffer", compress);
1757         error_uc->guc.last_fence = uc->guc.ct.requests.last_fence;
1758         gt_record_guc_ctb(error_uc->guc.ctb + 0, &uc->guc.ct.ctbs.send,
1759                           uc->guc.ct.ctbs.send.desc, (struct intel_guc *)&uc->guc);
1760         gt_record_guc_ctb(error_uc->guc.ctb + 1, &uc->guc.ct.ctbs.recv,
1761                           uc->guc.ct.ctbs.send.desc, (struct intel_guc *)&uc->guc);
1762
1763         return error_uc;
1764 }
1765
1766 /* Capture display registers. */
1767 static void gt_record_display_regs(struct intel_gt_coredump *gt)
1768 {
1769         struct intel_uncore *uncore = gt->_gt->uncore;
1770         struct drm_i915_private *i915 = uncore->i915;
1771
1772         if (DISPLAY_VER(i915) >= 6 && DISPLAY_VER(i915) < 20)
1773                 gt->derrmr = intel_uncore_read(uncore, DERRMR);
1774
1775         if (GRAPHICS_VER(i915) >= 8)
1776                 gt->ier = intel_uncore_read(uncore, GEN8_DE_MISC_IER);
1777         else if (IS_VALLEYVIEW(i915))
1778                 gt->ier = intel_uncore_read(uncore, VLV_IER);
1779         else if (HAS_PCH_SPLIT(i915))
1780                 gt->ier = intel_uncore_read(uncore, DEIER);
1781         else if (GRAPHICS_VER(i915) == 2)
1782                 gt->ier = intel_uncore_read16(uncore, GEN2_IER);
1783         else
1784                 gt->ier = intel_uncore_read(uncore, GEN2_IER);
1785 }
1786
1787 /* Capture all other registers that GuC doesn't capture. */
1788 static void gt_record_global_nonguc_regs(struct intel_gt_coredump *gt)
1789 {
1790         struct intel_uncore *uncore = gt->_gt->uncore;
1791         struct drm_i915_private *i915 = uncore->i915;
1792         int i;
1793
1794         if (IS_VALLEYVIEW(i915)) {
1795                 gt->gtier[0] = intel_uncore_read(uncore, GTIER);
1796                 gt->ngtier = 1;
1797         } else if (GRAPHICS_VER(i915) >= 11) {
1798                 gt->gtier[0] =
1799                         intel_uncore_read(uncore,
1800                                           GEN11_RENDER_COPY_INTR_ENABLE);
1801                 gt->gtier[1] =
1802                         intel_uncore_read(uncore, GEN11_VCS_VECS_INTR_ENABLE);
1803                 gt->gtier[2] =
1804                         intel_uncore_read(uncore, GEN11_GUC_SG_INTR_ENABLE);
1805                 gt->gtier[3] =
1806                         intel_uncore_read(uncore,
1807                                           GEN11_GPM_WGBOXPERF_INTR_ENABLE);
1808                 gt->gtier[4] =
1809                         intel_uncore_read(uncore,
1810                                           GEN11_CRYPTO_RSVD_INTR_ENABLE);
1811                 gt->gtier[5] =
1812                         intel_uncore_read(uncore,
1813                                           GEN11_GUNIT_CSME_INTR_ENABLE);
1814                 gt->ngtier = 6;
1815         } else if (GRAPHICS_VER(i915) >= 8) {
1816                 for (i = 0; i < 4; i++)
1817                         gt->gtier[i] =
1818                                 intel_uncore_read(uncore, GEN8_GT_IER(i));
1819                 gt->ngtier = 4;
1820         } else if (HAS_PCH_SPLIT(i915)) {
1821                 gt->gtier[0] = intel_uncore_read(uncore, GTIER);
1822                 gt->ngtier = 1;
1823         }
1824
1825         gt->eir = intel_uncore_read(uncore, EIR);
1826         gt->pgtbl_er = intel_uncore_read(uncore, PGTBL_ER);
1827 }
1828
1829 /*
1830  * Capture all registers that relate to workload submission.
1831  * NOTE: In GuC submission, when GuC resets an engine, it can dump these for us
1832  */
1833 static void gt_record_global_regs(struct intel_gt_coredump *gt)
1834 {
1835         struct intel_uncore *uncore = gt->_gt->uncore;
1836         struct drm_i915_private *i915 = uncore->i915;
1837         int i;
1838
1839         /*
1840          * General organization
1841          * 1. Registers specific to a single generation
1842          * 2. Registers which belong to multiple generations
1843          * 3. Feature specific registers.
1844          * 4. Everything else
1845          * Please try to follow the order.
1846          */
1847
1848         /* 1: Registers specific to a single generation */
1849         if (IS_VALLEYVIEW(i915))
1850                 gt->forcewake = intel_uncore_read_fw(uncore, FORCEWAKE_VLV);
1851
1852         if (GRAPHICS_VER(i915) == 7)
1853                 gt->err_int = intel_uncore_read(uncore, GEN7_ERR_INT);
1854
1855         if (GRAPHICS_VER_FULL(i915) >= IP_VER(12, 55)) {
1856                 gt->fault_data0 = intel_gt_mcr_read_any((struct intel_gt *)gt->_gt,
1857                                                         XEHP_FAULT_TLB_DATA0);
1858                 gt->fault_data1 = intel_gt_mcr_read_any((struct intel_gt *)gt->_gt,
1859                                                         XEHP_FAULT_TLB_DATA1);
1860         } else if (GRAPHICS_VER(i915) >= 12) {
1861                 gt->fault_data0 = intel_uncore_read(uncore,
1862                                                     GEN12_FAULT_TLB_DATA0);
1863                 gt->fault_data1 = intel_uncore_read(uncore,
1864                                                     GEN12_FAULT_TLB_DATA1);
1865         } else if (GRAPHICS_VER(i915) >= 8) {
1866                 gt->fault_data0 = intel_uncore_read(uncore,
1867                                                     GEN8_FAULT_TLB_DATA0);
1868                 gt->fault_data1 = intel_uncore_read(uncore,
1869                                                     GEN8_FAULT_TLB_DATA1);
1870         }
1871
1872         if (GRAPHICS_VER(i915) == 6) {
1873                 gt->forcewake = intel_uncore_read_fw(uncore, FORCEWAKE);
1874                 gt->gab_ctl = intel_uncore_read(uncore, GAB_CTL);
1875                 gt->gfx_mode = intel_uncore_read(uncore, GFX_MODE);
1876         }
1877
1878         /* 2: Registers which belong to multiple generations */
1879         if (GRAPHICS_VER(i915) >= 7)
1880                 gt->forcewake = intel_uncore_read_fw(uncore, FORCEWAKE_MT);
1881
1882         if (GRAPHICS_VER(i915) >= 6) {
1883                 if (GRAPHICS_VER(i915) < 12) {
1884                         gt->error = intel_uncore_read(uncore, ERROR_GEN6);
1885                         gt->done_reg = intel_uncore_read(uncore, DONE_REG);
1886                 }
1887         }
1888
1889         /* 3: Feature specific registers */
1890         if (IS_GRAPHICS_VER(i915, 6, 7)) {
1891                 gt->gam_ecochk = intel_uncore_read(uncore, GAM_ECOCHK);
1892                 gt->gac_eco = intel_uncore_read(uncore, GAC_ECO_BITS);
1893         }
1894
1895         if (IS_GRAPHICS_VER(i915, 8, 11))
1896                 gt->gtt_cache = intel_uncore_read(uncore, HSW_GTT_CACHE_EN);
1897
1898         if (GRAPHICS_VER(i915) == 12)
1899                 gt->aux_err = intel_uncore_read(uncore, GEN12_AUX_ERR_DBG);
1900
1901         if (GRAPHICS_VER(i915) >= 12) {
1902                 for (i = 0; i < I915_MAX_SFC; i++) {
1903                         /*
1904                          * SFC_DONE resides in the VD forcewake domain, so it
1905                          * only exists if the corresponding VCS engine is
1906                          * present.
1907                          */
1908                         if ((gt->_gt->info.sfc_mask & BIT(i)) == 0 ||
1909                             !HAS_ENGINE(gt->_gt, _VCS(i * 2)))
1910                                 continue;
1911
1912                         gt->sfc_done[i] =
1913                                 intel_uncore_read(uncore, GEN12_SFC_DONE(i));
1914                 }
1915
1916                 gt->gam_done = intel_uncore_read(uncore, GEN12_GAM_DONE);
1917         }
1918 }
1919
1920 static void gt_record_info(struct intel_gt_coredump *gt)
1921 {
1922         memcpy(&gt->info, &gt->_gt->info, sizeof(struct intel_gt_info));
1923         gt->clock_frequency = gt->_gt->clock_frequency;
1924         gt->clock_period_ns = gt->_gt->clock_period_ns;
1925 }
1926
1927 /*
1928  * Generate a semi-unique error code. The code is not meant to have meaning, The
1929  * code's only purpose is to try to prevent false duplicated bug reports by
1930  * grossly estimating a GPU error state.
1931  *
1932  * TODO Ideally, hashing the batchbuffer would be a very nice way to determine
1933  * the hang if we could strip the GTT offset information from it.
1934  *
1935  * It's only a small step better than a random number in its current form.
1936  */
1937 static u32 generate_ecode(const struct intel_engine_coredump *ee)
1938 {
1939         /*
1940          * IPEHR would be an ideal way to detect errors, as it's the gross
1941          * measure of "the command that hung." However, has some very common
1942          * synchronization commands which almost always appear in the case
1943          * strictly a client bug. Use instdone to differentiate those some.
1944          */
1945         return ee ? ee->ipehr ^ ee->instdone.instdone : 0;
1946 }
1947
1948 static const char *error_msg(struct i915_gpu_coredump *error)
1949 {
1950         struct intel_engine_coredump *first = NULL;
1951         unsigned int hung_classes = 0;
1952         struct intel_gt_coredump *gt;
1953         int len;
1954
1955         for (gt = error->gt; gt; gt = gt->next) {
1956                 struct intel_engine_coredump *cs;
1957
1958                 for (cs = gt->engine; cs; cs = cs->next) {
1959                         if (cs->hung) {
1960                                 hung_classes |= BIT(cs->engine->uabi_class);
1961                                 if (!first)
1962                                         first = cs;
1963                         }
1964                 }
1965         }
1966
1967         len = scnprintf(error->error_msg, sizeof(error->error_msg),
1968                         "GPU HANG: ecode %d:%x:%08x",
1969                         GRAPHICS_VER(error->i915), hung_classes,
1970                         generate_ecode(first));
1971         if (first && first->context.pid) {
1972                 /* Just show the first executing process, more is confusing */
1973                 len += scnprintf(error->error_msg + len,
1974                                  sizeof(error->error_msg) - len,
1975                                  ", in %s [%d]",
1976                                  first->context.comm, first->context.pid);
1977         }
1978
1979         return error->error_msg;
1980 }
1981
1982 static void capture_gen(struct i915_gpu_coredump *error)
1983 {
1984         struct drm_i915_private *i915 = error->i915;
1985
1986         error->wakelock = atomic_read(&i915->runtime_pm.wakeref_count);
1987         error->suspended = pm_runtime_suspended(i915->drm.dev);
1988
1989         error->iommu = i915_vtd_active(i915);
1990         error->reset_count = i915_reset_count(&i915->gpu_error);
1991         error->suspend_count = i915->suspend_count;
1992
1993         i915_params_copy(&error->params, &i915->params);
1994         intel_display_params_copy(&error->display_params);
1995         memcpy(&error->device_info,
1996                INTEL_INFO(i915),
1997                sizeof(error->device_info));
1998         memcpy(&error->runtime_info,
1999                RUNTIME_INFO(i915),
2000                sizeof(error->runtime_info));
2001         memcpy(&error->display_device_info, DISPLAY_INFO(i915),
2002                sizeof(error->display_device_info));
2003         memcpy(&error->display_runtime_info, DISPLAY_RUNTIME_INFO(i915),
2004                sizeof(error->display_runtime_info));
2005         error->driver_caps = i915->caps;
2006 }
2007
2008 struct i915_gpu_coredump *
2009 i915_gpu_coredump_alloc(struct drm_i915_private *i915, gfp_t gfp)
2010 {
2011         struct i915_gpu_coredump *error;
2012
2013         if (!i915->params.error_capture)
2014                 return NULL;
2015
2016         error = kzalloc(sizeof(*error), gfp);
2017         if (!error)
2018                 return NULL;
2019
2020         kref_init(&error->ref);
2021         error->i915 = i915;
2022
2023         error->time = ktime_get_real();
2024         error->boottime = ktime_get_boottime();
2025         error->uptime = ktime_sub(ktime_get(), to_gt(i915)->last_init_time);
2026         error->capture = jiffies;
2027
2028         capture_gen(error);
2029
2030         return error;
2031 }
2032
2033 #define DAY_AS_SECONDS(x) (24 * 60 * 60 * (x))
2034
2035 struct intel_gt_coredump *
2036 intel_gt_coredump_alloc(struct intel_gt *gt, gfp_t gfp, u32 dump_flags)
2037 {
2038         struct intel_gt_coredump *gc;
2039
2040         gc = kzalloc(sizeof(*gc), gfp);
2041         if (!gc)
2042                 return NULL;
2043
2044         gc->_gt = gt;
2045         gc->awake = intel_gt_pm_is_awake(gt);
2046
2047         gt_record_display_regs(gc);
2048         gt_record_global_nonguc_regs(gc);
2049
2050         /*
2051          * GuC dumps global, eng-class and eng-instance registers
2052          * (that can change as part of engine state during execution)
2053          * before an engine is reset due to a hung context.
2054          * GuC captures and reports all three groups of registers
2055          * together as a single set before the engine is reset.
2056          * Thus, if GuC triggered the context reset we retrieve
2057          * the register values as part of gt_record_engines.
2058          */
2059         if (!(dump_flags & CORE_DUMP_FLAG_IS_GUC_CAPTURE))
2060                 gt_record_global_regs(gc);
2061
2062         gt_record_fences(gc);
2063
2064         return gc;
2065 }
2066
2067 struct i915_vma_compress *
2068 i915_vma_capture_prepare(struct intel_gt_coredump *gt)
2069 {
2070         struct i915_vma_compress *compress;
2071
2072         compress = kmalloc(sizeof(*compress), ALLOW_FAIL);
2073         if (!compress)
2074                 return NULL;
2075
2076         if (!compress_init(compress)) {
2077                 kfree(compress);
2078                 return NULL;
2079         }
2080
2081         return compress;
2082 }
2083
2084 void i915_vma_capture_finish(struct intel_gt_coredump *gt,
2085                              struct i915_vma_compress *compress)
2086 {
2087         if (!compress)
2088                 return;
2089
2090         compress_fini(compress);
2091         kfree(compress);
2092 }
2093
2094 static struct i915_gpu_coredump *
2095 __i915_gpu_coredump(struct intel_gt *gt, intel_engine_mask_t engine_mask, u32 dump_flags)
2096 {
2097         struct drm_i915_private *i915 = gt->i915;
2098         struct i915_gpu_coredump *error;
2099
2100         /* Check if GPU capture has been disabled */
2101         error = READ_ONCE(i915->gpu_error.first_error);
2102         if (IS_ERR(error))
2103                 return error;
2104
2105         error = i915_gpu_coredump_alloc(i915, ALLOW_FAIL);
2106         if (!error)
2107                 return ERR_PTR(-ENOMEM);
2108
2109         error->gt = intel_gt_coredump_alloc(gt, ALLOW_FAIL, dump_flags);
2110         if (error->gt) {
2111                 struct i915_vma_compress *compress;
2112
2113                 compress = i915_vma_capture_prepare(error->gt);
2114                 if (!compress) {
2115                         kfree(error->gt);
2116                         kfree(error);
2117                         return ERR_PTR(-ENOMEM);
2118                 }
2119
2120                 if (INTEL_INFO(i915)->has_gt_uc) {
2121                         error->gt->uc = gt_record_uc(error->gt, compress);
2122                         if (error->gt->uc) {
2123                                 if (dump_flags & CORE_DUMP_FLAG_IS_GUC_CAPTURE)
2124                                         error->gt->uc->guc.is_guc_capture = true;
2125                                 else
2126                                         GEM_BUG_ON(error->gt->uc->guc.is_guc_capture);
2127                         }
2128                 }
2129
2130                 gt_record_info(error->gt);
2131                 gt_record_engines(error->gt, engine_mask, compress, dump_flags);
2132
2133
2134                 i915_vma_capture_finish(error->gt, compress);
2135
2136                 error->simulated |= error->gt->simulated;
2137         }
2138
2139         error->overlay = intel_overlay_capture_error_state(i915);
2140
2141         return error;
2142 }
2143
2144 static struct i915_gpu_coredump *
2145 i915_gpu_coredump(struct intel_gt *gt, intel_engine_mask_t engine_mask, u32 dump_flags)
2146 {
2147         static DEFINE_MUTEX(capture_mutex);
2148         int ret = mutex_lock_interruptible(&capture_mutex);
2149         struct i915_gpu_coredump *dump;
2150
2151         if (ret)
2152                 return ERR_PTR(ret);
2153
2154         dump = __i915_gpu_coredump(gt, engine_mask, dump_flags);
2155         mutex_unlock(&capture_mutex);
2156
2157         return dump;
2158 }
2159
2160 void i915_error_state_store(struct i915_gpu_coredump *error)
2161 {
2162         struct drm_i915_private *i915;
2163         static bool warned;
2164
2165         if (IS_ERR_OR_NULL(error))
2166                 return;
2167
2168         i915 = error->i915;
2169         drm_info(&i915->drm, "%s\n", error_msg(error));
2170
2171         if (error->simulated ||
2172             cmpxchg(&i915->gpu_error.first_error, NULL, error))
2173                 return;
2174
2175         i915_gpu_coredump_get(error);
2176
2177         if (!xchg(&warned, true) &&
2178             ktime_get_real_seconds() - DRIVER_TIMESTAMP < DAY_AS_SECONDS(180)) {
2179                 pr_info("GPU hangs can indicate a bug anywhere in the entire gfx stack, including userspace.\n");
2180                 pr_info("Please file a _new_ bug report at https://gitlab.freedesktop.org/drm/intel/issues/new.\n");
2181                 pr_info("Please see https://drm.pages.freedesktop.org/intel-docs/how-to-file-i915-bugs.html for details.\n");
2182                 pr_info("drm/i915 developers can then reassign to the right component if it's not a kernel issue.\n");
2183                 pr_info("The GPU crash dump is required to analyze GPU hangs, so please always attach it.\n");
2184                 pr_info("GPU crash dump saved to /sys/class/drm/card%d/error\n",
2185                         i915->drm.primary->index);
2186         }
2187 }
2188
2189 /**
2190  * i915_capture_error_state - capture an error record for later analysis
2191  * @gt: intel_gt which originated the hang
2192  * @engine_mask: hung engines
2193  * @dump_flags: dump flags
2194  *
2195  * Should be called when an error is detected (either a hang or an error
2196  * interrupt) to capture error state from the time of the error.  Fills
2197  * out a structure which becomes available in debugfs for user level tools
2198  * to pick up.
2199  */
2200 void i915_capture_error_state(struct intel_gt *gt,
2201                               intel_engine_mask_t engine_mask, u32 dump_flags)
2202 {
2203         struct i915_gpu_coredump *error;
2204
2205         error = i915_gpu_coredump(gt, engine_mask, dump_flags);
2206         if (IS_ERR(error)) {
2207                 cmpxchg(&gt->i915->gpu_error.first_error, NULL, error);
2208                 return;
2209         }
2210
2211         i915_error_state_store(error);
2212         i915_gpu_coredump_put(error);
2213 }
2214
2215 static struct i915_gpu_coredump *
2216 i915_first_error_state(struct drm_i915_private *i915)
2217 {
2218         struct i915_gpu_coredump *error;
2219
2220         spin_lock_irq(&i915->gpu_error.lock);
2221         error = i915->gpu_error.first_error;
2222         if (!IS_ERR_OR_NULL(error))
2223                 i915_gpu_coredump_get(error);
2224         spin_unlock_irq(&i915->gpu_error.lock);
2225
2226         return error;
2227 }
2228
2229 void i915_reset_error_state(struct drm_i915_private *i915)
2230 {
2231         struct i915_gpu_coredump *error;
2232
2233         spin_lock_irq(&i915->gpu_error.lock);
2234         error = i915->gpu_error.first_error;
2235         if (error != ERR_PTR(-ENODEV)) /* if disabled, always disabled */
2236                 i915->gpu_error.first_error = NULL;
2237         spin_unlock_irq(&i915->gpu_error.lock);
2238
2239         if (!IS_ERR_OR_NULL(error))
2240                 i915_gpu_coredump_put(error);
2241 }
2242
2243 void i915_disable_error_state(struct drm_i915_private *i915, int err)
2244 {
2245         spin_lock_irq(&i915->gpu_error.lock);
2246         if (!i915->gpu_error.first_error)
2247                 i915->gpu_error.first_error = ERR_PTR(err);
2248         spin_unlock_irq(&i915->gpu_error.lock);
2249 }
2250
2251 #if IS_ENABLED(CONFIG_DRM_I915_DEBUG_GEM)
2252 void intel_klog_error_capture(struct intel_gt *gt,
2253                               intel_engine_mask_t engine_mask)
2254 {
2255         static int g_count;
2256         struct drm_i915_private *i915 = gt->i915;
2257         struct i915_gpu_coredump *error;
2258         intel_wakeref_t wakeref;
2259         size_t buf_size = PAGE_SIZE * 128;
2260         size_t pos_err;
2261         char *buf, *ptr, *next;
2262         int l_count = g_count++;
2263         int line = 0;
2264
2265         /* Can't allocate memory during a reset */
2266         if (test_bit(I915_RESET_BACKOFF, &gt->reset.flags)) {
2267                 drm_err(&gt->i915->drm, "[Capture/%d.%d] Inside GT reset, skipping error capture :(\n",
2268                         l_count, line++);
2269                 return;
2270         }
2271
2272         error = READ_ONCE(i915->gpu_error.first_error);
2273         if (error) {
2274                 drm_err(&i915->drm, "[Capture/%d.%d] Clearing existing error capture first...\n",
2275                         l_count, line++);
2276                 i915_reset_error_state(i915);
2277         }
2278
2279         with_intel_runtime_pm(&i915->runtime_pm, wakeref)
2280                 error = i915_gpu_coredump(gt, engine_mask, CORE_DUMP_FLAG_NONE);
2281
2282         if (IS_ERR(error)) {
2283                 drm_err(&i915->drm, "[Capture/%d.%d] Failed to capture error capture: %ld!\n",
2284                         l_count, line++, PTR_ERR(error));
2285                 return;
2286         }
2287
2288         buf = kvmalloc(buf_size, GFP_KERNEL);
2289         if (!buf) {
2290                 drm_err(&i915->drm, "[Capture/%d.%d] Failed to allocate buffer for error capture!\n",
2291                         l_count, line++);
2292                 i915_gpu_coredump_put(error);
2293                 return;
2294         }
2295
2296         drm_info(&i915->drm, "[Capture/%d.%d] Dumping i915 error capture for %ps...\n",
2297                  l_count, line++, __builtin_return_address(0));
2298
2299         /* Largest string length safe to print via dmesg */
2300 #       define MAX_CHUNK        800
2301
2302         pos_err = 0;
2303         while (1) {
2304                 ssize_t got = i915_gpu_coredump_copy_to_buffer(error, buf, pos_err, buf_size - 1);
2305
2306                 if (got <= 0)
2307                         break;
2308
2309                 buf[got] = 0;
2310                 pos_err += got;
2311
2312                 ptr = buf;
2313                 while (got > 0) {
2314                         size_t count;
2315                         char tag[2];
2316
2317                         next = strnchr(ptr, got, '\n');
2318                         if (next) {
2319                                 count = next - ptr;
2320                                 *next = 0;
2321                                 tag[0] = '>';
2322                                 tag[1] = '<';
2323                         } else {
2324                                 count = got;
2325                                 tag[0] = '}';
2326                                 tag[1] = '{';
2327                         }
2328
2329                         if (count > MAX_CHUNK) {
2330                                 size_t pos;
2331                                 char *ptr2 = ptr;
2332
2333                                 for (pos = MAX_CHUNK; pos < count; pos += MAX_CHUNK) {
2334                                         char chr = ptr[pos];
2335
2336                                         ptr[pos] = 0;
2337                                         drm_info(&i915->drm, "[Capture/%d.%d] }%s{\n",
2338                                                  l_count, line++, ptr2);
2339                                         ptr[pos] = chr;
2340                                         ptr2 = ptr + pos;
2341
2342                                         /*
2343                                          * If spewing large amounts of data via a serial console,
2344                                          * this can be a very slow process. So be friendly and try
2345                                          * not to cause 'softlockup on CPU' problems.
2346                                          */
2347                                         cond_resched();
2348                                 }
2349
2350                                 if (ptr2 < (ptr + count))
2351                                         drm_info(&i915->drm, "[Capture/%d.%d] %c%s%c\n",
2352                                                  l_count, line++, tag[0], ptr2, tag[1]);
2353                                 else if (tag[0] == '>')
2354                                         drm_info(&i915->drm, "[Capture/%d.%d] ><\n",
2355                                                  l_count, line++);
2356                         } else {
2357                                 drm_info(&i915->drm, "[Capture/%d.%d] %c%s%c\n",
2358                                          l_count, line++, tag[0], ptr, tag[1]);
2359                         }
2360
2361                         ptr = next;
2362                         got -= count;
2363                         if (next) {
2364                                 ptr++;
2365                                 got--;
2366                         }
2367
2368                         /* As above. */
2369                         cond_resched();
2370                 }
2371
2372                 if (got)
2373                         drm_info(&i915->drm, "[Capture/%d.%d] Got %zd bytes remaining!\n",
2374                                  l_count, line++, got);
2375         }
2376
2377         kvfree(buf);
2378
2379         drm_info(&i915->drm, "[Capture/%d.%d] Dumped %zd bytes\n", l_count, line++, pos_err);
2380 }
2381 #endif
2382
2383 static ssize_t gpu_state_read(struct file *file, char __user *ubuf,
2384                               size_t count, loff_t *pos)
2385 {
2386         struct i915_gpu_coredump *error;
2387         ssize_t ret;
2388         void *buf;
2389
2390         error = file->private_data;
2391         if (!error)
2392                 return 0;
2393
2394         /* Bounce buffer required because of kernfs __user API convenience. */
2395         buf = kmalloc(count, GFP_KERNEL);
2396         if (!buf)
2397                 return -ENOMEM;
2398
2399         ret = i915_gpu_coredump_copy_to_buffer(error, buf, *pos, count);
2400         if (ret <= 0)
2401                 goto out;
2402
2403         if (!copy_to_user(ubuf, buf, ret))
2404                 *pos += ret;
2405         else
2406                 ret = -EFAULT;
2407
2408 out:
2409         kfree(buf);
2410         return ret;
2411 }
2412
2413 static int gpu_state_release(struct inode *inode, struct file *file)
2414 {
2415         i915_gpu_coredump_put(file->private_data);
2416         return 0;
2417 }
2418
2419 static int i915_gpu_info_open(struct inode *inode, struct file *file)
2420 {
2421         struct drm_i915_private *i915 = inode->i_private;
2422         struct i915_gpu_coredump *gpu;
2423         intel_wakeref_t wakeref;
2424
2425         gpu = NULL;
2426         with_intel_runtime_pm(&i915->runtime_pm, wakeref)
2427                 gpu = i915_gpu_coredump(to_gt(i915), ALL_ENGINES, CORE_DUMP_FLAG_NONE);
2428
2429         if (IS_ERR(gpu))
2430                 return PTR_ERR(gpu);
2431
2432         file->private_data = gpu;
2433         return 0;
2434 }
2435
2436 static const struct file_operations i915_gpu_info_fops = {
2437         .owner = THIS_MODULE,
2438         .open = i915_gpu_info_open,
2439         .read = gpu_state_read,
2440         .llseek = default_llseek,
2441         .release = gpu_state_release,
2442 };
2443
2444 static ssize_t
2445 i915_error_state_write(struct file *filp,
2446                        const char __user *ubuf,
2447                        size_t cnt,
2448                        loff_t *ppos)
2449 {
2450         struct i915_gpu_coredump *error = filp->private_data;
2451
2452         if (!error)
2453                 return 0;
2454
2455         drm_dbg(&error->i915->drm, "Resetting error state\n");
2456         i915_reset_error_state(error->i915);
2457
2458         return cnt;
2459 }
2460
2461 static int i915_error_state_open(struct inode *inode, struct file *file)
2462 {
2463         struct i915_gpu_coredump *error;
2464
2465         error = i915_first_error_state(inode->i_private);
2466         if (IS_ERR(error))
2467                 return PTR_ERR(error);
2468
2469         file->private_data  = error;
2470         return 0;
2471 }
2472
2473 static const struct file_operations i915_error_state_fops = {
2474         .owner = THIS_MODULE,
2475         .open = i915_error_state_open,
2476         .read = gpu_state_read,
2477         .write = i915_error_state_write,
2478         .llseek = default_llseek,
2479         .release = gpu_state_release,
2480 };
2481
2482 void i915_gpu_error_debugfs_register(struct drm_i915_private *i915)
2483 {
2484         struct drm_minor *minor = i915->drm.primary;
2485
2486         debugfs_create_file("i915_error_state", 0644, minor->debugfs_root, i915,
2487                             &i915_error_state_fops);
2488         debugfs_create_file("i915_gpu_info", 0644, minor->debugfs_root, i915,
2489                             &i915_gpu_info_fops);
2490 }
2491
2492 static ssize_t error_state_read(struct file *filp, struct kobject *kobj,
2493                                 struct bin_attribute *attr, char *buf,
2494                                 loff_t off, size_t count)
2495 {
2496
2497         struct device *kdev = kobj_to_dev(kobj);
2498         struct drm_i915_private *i915 = kdev_minor_to_i915(kdev);
2499         struct i915_gpu_coredump *gpu;
2500         ssize_t ret = 0;
2501
2502         /*
2503          * FIXME: Concurrent clients triggering resets and reading + clearing
2504          * dumps can cause inconsistent sysfs reads when a user calls in with a
2505          * non-zero offset to complete a prior partial read but the
2506          * gpu_coredump has been cleared or replaced.
2507          */
2508
2509         gpu = i915_first_error_state(i915);
2510         if (IS_ERR(gpu)) {
2511                 ret = PTR_ERR(gpu);
2512         } else if (gpu) {
2513                 ret = i915_gpu_coredump_copy_to_buffer(gpu, buf, off, count);
2514                 i915_gpu_coredump_put(gpu);
2515         } else {
2516                 const char *str = "No error state collected\n";
2517                 size_t len = strlen(str);
2518
2519                 if (off < len) {
2520                         ret = min_t(size_t, count, len - off);
2521                         memcpy(buf, str + off, ret);
2522                 }
2523         }
2524
2525         return ret;
2526 }
2527
2528 static ssize_t error_state_write(struct file *file, struct kobject *kobj,
2529                                  struct bin_attribute *attr, char *buf,
2530                                  loff_t off, size_t count)
2531 {
2532         struct device *kdev = kobj_to_dev(kobj);
2533         struct drm_i915_private *dev_priv = kdev_minor_to_i915(kdev);
2534
2535         drm_dbg(&dev_priv->drm, "Resetting error state\n");
2536         i915_reset_error_state(dev_priv);
2537
2538         return count;
2539 }
2540
2541 static const struct bin_attribute error_state_attr = {
2542         .attr.name = "error",
2543         .attr.mode = S_IRUSR | S_IWUSR,
2544         .size = 0,
2545         .read = error_state_read,
2546         .write = error_state_write,
2547 };
2548
2549 void i915_gpu_error_sysfs_setup(struct drm_i915_private *i915)
2550 {
2551         struct device *kdev = i915->drm.primary->kdev;
2552
2553         if (sysfs_create_bin_file(&kdev->kobj, &error_state_attr))
2554                 drm_err(&i915->drm, "error_state sysfs setup failed\n");
2555 }
2556
2557 void i915_gpu_error_sysfs_teardown(struct drm_i915_private *i915)
2558 {
2559         struct device *kdev = i915->drm.primary->kdev;
2560
2561         sysfs_remove_bin_file(&kdev->kobj, &error_state_attr);
2562 }