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_display_snapshot.h"
  44
  45 #include "gem/i915_gem_context.h"
  46 #include "gem/i915_gem_lmem.h"
  47 #include "gt/intel_engine_regs.h"
  48 #include "gt/intel_gt.h"
  49 #include "gt/intel_gt_mcr.h"
  50 #include "gt/intel_gt_pm.h"
  51 #include "gt/intel_gt_regs.h"
  52 #include "gt/uc/intel_guc_capture.h"
  53
  54 #include "i915_driver.h"
  55 #include "i915_drv.h"
  56 #include "i915_gpu_error.h"
  57 #include "i915_memcpy.h"
  58 #include "i915_reg.h"
  59 #include "i915_scatterlist.h"
  60 #include "i915_sysfs.h"
  61 #include "i915_utils.h"
  62
  63 #define ALLOW_FAIL (__GFP_KSWAPD_RECLAIM | __GFP_RETRY_MAYFAIL | __GFP_NOWARN)
  64 #define ATOMIC_MAYFAIL (GFP_ATOMIC | __GFP_NOWARN)
  65
  66 static void __sg_set_buf(struct scatterlist *sg,
  67                          void *addr, unsigned int len, loff_t it)
  68 {
  69         sg->page_link = (unsigned long)virt_to_page(addr);
  70         sg->offset = offset_in_page(addr);
  71         sg->length = len;
  72         sg->dma_address = it;
  73 }
  74
  75 static bool __i915_error_grow(struct drm_i915_error_state_buf *e, size_t len)
  76 {
  77         if (!len)
  78                 return false;
  79
  80         if (e->bytes + len + 1 <= e->size)
  81                 return true;
  82
  83         if (e->bytes) {
  84                 __sg_set_buf(e->cur++, e->buf, e->bytes, e->iter);
  85                 e->iter += e->bytes;
  86                 e->buf = NULL;
  87                 e->bytes = 0;
  88         }
  89
  90         if (e->cur == e->end) {
  91                 struct scatterlist *sgl;
  92
  93                 sgl = (typeof(sgl))__get_free_page(ALLOW_FAIL);
  94                 if (!sgl) {
  95                         e->err = -ENOMEM;
  96                         return false;
  97                 }
  98
  99                 if (e->cur) {
 100                         e->cur->offset = 0;
 101                         e->cur->length = 0;
 102                         e->cur->page_link =
 103                                 (unsigned long)sgl | SG_CHAIN;
 104                 } else {
 105                         e->sgl = sgl;
 106                 }
 107
 108                 e->cur = sgl;
 109                 e->end = sgl + SG_MAX_SINGLE_ALLOC - 1;
 110         }
 111
 112         e->size = ALIGN(len + 1, SZ_64K);
 113         e->buf = kmalloc(e->size, ALLOW_FAIL);
 114         if (!e->buf) {
 115                 e->size = PAGE_ALIGN(len + 1);
 116                 e->buf = kmalloc(e->size, GFP_KERNEL);
 117         }
 118         if (!e->buf) {
 119                 e->err = -ENOMEM;
 120                 return false;
 121         }
 122
 123         return true;
 124 }
 125
 126 __printf(2, 0)
 127 static void i915_error_vprintf(struct drm_i915_error_state_buf *e,
 128                                const char *fmt, va_list args)
 129 {
 130         va_list ap;
 131         int len;
 132
 133         if (e->err)
 134                 return;
 135
 136         va_copy(ap, args);
 137         len = vsnprintf(NULL, 0, fmt, ap);
 138         va_end(ap);
 139         if (len <= 0) {
 140                 e->err = len;
 141                 return;
 142         }
 143
 144         if (!__i915_error_grow(e, len))
 145                 return;
 146
 147         GEM_BUG_ON(e->bytes >= e->size);
 148         len = vscnprintf(e->buf + e->bytes, e->size - e->bytes, fmt, args);
 149         if (len < 0) {
 150                 e->err = len;
 151                 return;
 152         }
 153         e->bytes += len;
 154 }
 155
 156 static void i915_error_puts(struct drm_i915_error_state_buf *e, const char *str)
 157 {
 158         unsigned len;
 159
 160         if (e->err || !str)
 161                 return;
 162
 163         len = strlen(str);
 164         if (!__i915_error_grow(e, len))
 165                 return;
 166
 167         GEM_BUG_ON(e->bytes + len > e->size);
 168         memcpy(e->buf + e->bytes, str, len);
 169         e->bytes += len;
 170 }
 171
 172 #define err_printf(e, ...) i915_error_printf(e, __VA_ARGS__)
 173 #define err_puts(e, s) i915_error_puts(e, s)
 174
 175 static void __i915_printfn_error(struct drm_printer *p, struct va_format *vaf)
 176 {
 177         i915_error_vprintf(p->arg, vaf->fmt, *vaf->va);
 178 }
 179
 180 static inline struct drm_printer
 181 i915_error_printer(struct drm_i915_error_state_buf *e)
 182 {
 183         struct drm_printer p = {
 184                 .printfn = __i915_printfn_error,
 185                 .arg = e,
 186         };
 187         return p;
 188 }
 189
 190 /* single threaded page allocator with a reserved stash for emergencies */
 191 static void pool_fini(struct folio_batch *fbatch)
 192 {
 193         folio_batch_release(fbatch);
 194 }
 195
 196 static int pool_refill(struct folio_batch *fbatch, gfp_t gfp)
 197 {
 198         while (folio_batch_space(fbatch)) {
 199                 struct folio *folio;
 200
 201                 folio = folio_alloc(gfp, 0);
 202                 if (!folio)
 203                         return -ENOMEM;
 204
 205                 folio_batch_add(fbatch, folio);
 206         }
 207
 208         return 0;
 209 }
 210
 211 static int pool_init(struct folio_batch *fbatch, gfp_t gfp)
 212 {
 213         int err;
 214
 215         folio_batch_init(fbatch);
 216
 217         err = pool_refill(fbatch, gfp);
 218         if (err)
 219                 pool_fini(fbatch);
 220
 221         return err;
 222 }
 223
 224 static void *pool_alloc(struct folio_batch *fbatch, gfp_t gfp)
 225 {
 226         struct folio *folio;
 227
 228         folio = folio_alloc(gfp, 0);
 229         if (!folio && folio_batch_count(fbatch))
 230                 folio = fbatch->folios[--fbatch->nr];
 231
 232         return folio ? folio_address(folio) : NULL;
 233 }
 234
 235 static void pool_free(struct folio_batch *fbatch, void *addr)
 236 {
 237         struct folio *folio = virt_to_folio(addr);
 238
 239         if (folio_batch_space(fbatch))
 240                 folio_batch_add(fbatch, folio);
 241         else
 242                 folio_put(folio);
 243 }
 244
 245 #ifdef CONFIG_DRM_I915_COMPRESS_ERROR
 246
 247 struct i915_vma_compress {
 248         struct folio_batch pool;
 249         struct z_stream_s zstream;
 250         void *tmp;
 251 };
 252
 253 static bool compress_init(struct i915_vma_compress *c)
 254 {
 255         struct z_stream_s *zstream = &c->zstream;
 256
 257         if (pool_init(&c->pool, ALLOW_FAIL))
 258                 return false;
 259
 260         zstream->workspace =
 261                 kmalloc(zlib_deflate_workspacesize(MAX_WBITS, MAX_MEM_LEVEL),
 262                         ALLOW_FAIL);
 263         if (!zstream->workspace) {
 264                 pool_fini(&c->pool);
 265                 return false;
 266         }
 267
 268         c->tmp = NULL;
 269         if (i915_has_memcpy_from_wc())
 270                 c->tmp = pool_alloc(&c->pool, ALLOW_FAIL);
 271
 272         return true;
 273 }
 274
 275 static bool compress_start(struct i915_vma_compress *c)
 276 {
 277         struct z_stream_s *zstream = &c->zstream;
 278         void *workspace = zstream->workspace;
 279
 280         memset(zstream, 0, sizeof(*zstream));
 281         zstream->workspace = workspace;
 282
 283         return zlib_deflateInit(zstream, Z_DEFAULT_COMPRESSION) == Z_OK;
 284 }
 285
 286 static void *compress_next_page(struct i915_vma_compress *c,
 287                                 struct i915_vma_coredump *dst)
 288 {
 289         void *page_addr;
 290         struct page *page;
 291
 292         page_addr = pool_alloc(&c->pool, ALLOW_FAIL);
 293         if (!page_addr)
 294                 return ERR_PTR(-ENOMEM);
 295
 296         page = virt_to_page(page_addr);
 297         list_add_tail(&page->lru, &dst->page_list);
 298         return page_addr;
 299 }
 300
 301 static int compress_page(struct i915_vma_compress *c,
 302                          void *src,
 303                          struct i915_vma_coredump *dst,
 304                          bool wc)
 305 {
 306         struct z_stream_s *zstream = &c->zstream;
 307
 308         zstream->next_in = src;
 309         if (wc && c->tmp && i915_memcpy_from_wc(c->tmp, src, PAGE_SIZE))
 310                 zstream->next_in = c->tmp;
 311         zstream->avail_in = PAGE_SIZE;
 312
 313         do {
 314                 if (zstream->avail_out == 0) {
 315                         zstream->next_out = compress_next_page(c, dst);
 316                         if (IS_ERR(zstream->next_out))
 317                                 return PTR_ERR(zstream->next_out);
 318
 319                         zstream->avail_out = PAGE_SIZE;
 320                 }
 321
 322                 if (zlib_deflate(zstream, Z_NO_FLUSH) != Z_OK)
 323                         return -EIO;
 324
 325                 cond_resched();
 326         } while (zstream->avail_in);
 327
 328         /* Fallback to uncompressed if we increase size? */
 329         if (0 && zstream->total_out > zstream->total_in)
 330                 return -E2BIG;
 331
 332         return 0;
 333 }
 334
 335 static int compress_flush(struct i915_vma_compress *c,
 336                           struct i915_vma_coredump *dst)
 337 {
 338         struct z_stream_s *zstream = &c->zstream;
 339
 340         do {
 341                 switch (zlib_deflate(zstream, Z_FINISH)) {
 342                 case Z_OK: /* more space requested */
 343                         zstream->next_out = compress_next_page(c, dst);
 344                         if (IS_ERR(zstream->next_out))
 345                                 return PTR_ERR(zstream->next_out);
 346
 347                         zstream->avail_out = PAGE_SIZE;
 348                         break;
 349
 350                 case Z_STREAM_END:
 351                         goto end;
 352
 353                 default: /* any error */
 354                         return -EIO;
 355                 }
 356         } while (1);
 357
 358 end:
 359         memset(zstream->next_out, 0, zstream->avail_out);
 360         dst->unused = zstream->avail_out;
 361         return 0;
 362 }
 363
 364 static void compress_finish(struct i915_vma_compress *c)
 365 {
 366         zlib_deflateEnd(&c->zstream);
 367 }
 368
 369 static void compress_fini(struct i915_vma_compress *c)
 370 {
 371         kfree(c->zstream.workspace);
 372         if (c->tmp)
 373                 pool_free(&c->pool, c->tmp);
 374         pool_fini(&c->pool);
 375 }
 376
 377 static void err_compression_marker(struct drm_i915_error_state_buf *m)
 378 {
 379         err_puts(m, ":");
 380 }
 381
 382 #else
 383
 384 struct i915_vma_compress {
 385         struct folio_batch pool;
 386 };
 387
 388 static bool compress_init(struct i915_vma_compress *c)
 389 {
 390         return pool_init(&c->pool, ALLOW_FAIL) == 0;
 391 }
 392
 393 static bool compress_start(struct i915_vma_compress *c)
 394 {
 395         return true;
 396 }
 397
 398 static int compress_page(struct i915_vma_compress *c,
 399                          void *src,
 400                          struct i915_vma_coredump *dst,
 401                          bool wc)
 402 {
 403         void *ptr;
 404
 405         ptr = pool_alloc(&c->pool, ALLOW_FAIL);
 406         if (!ptr)
 407                 return -ENOMEM;
 408
 409         if (!(wc && i915_memcpy_from_wc(ptr, src, PAGE_SIZE)))
 410                 memcpy(ptr, src, PAGE_SIZE);
 411         list_add_tail(&virt_to_page(ptr)->lru, &dst->page_list);
 412         cond_resched();
 413
 414         return 0;
 415 }
 416
 417 static int compress_flush(struct i915_vma_compress *c,
 418                           struct i915_vma_coredump *dst)
 419 {
 420         return 0;
 421 }
 422
 423 static void compress_finish(struct i915_vma_compress *c)
 424 {
 425 }
 426
 427 static void compress_fini(struct i915_vma_compress *c)
 428 {
 429         pool_fini(&c->pool);
 430 }
 431
 432 static void err_compression_marker(struct drm_i915_error_state_buf *m)
 433 {
 434         err_puts(m, "~");
 435 }
 436
 437 #endif
 438
 439 static void error_print_instdone(struct drm_i915_error_state_buf *m,
 440                                  const struct intel_engine_coredump *ee)
 441 {
 442         int slice;
 443         int subslice;
 444         int iter;
 445
 446         err_printf(m, "  INSTDONE: 0x%08x\n",
 447                    ee->instdone.instdone);
 448
 449         if (ee->engine->class != RENDER_CLASS || GRAPHICS_VER(m->i915) <= 3)
 450                 return;
 451
 452         err_printf(m, "  SC_INSTDONE: 0x%08x\n",
 453                    ee->instdone.slice_common);
 454
 455         if (GRAPHICS_VER(m->i915) <= 6)
 456                 return;
 457
 458         for_each_ss_steering(iter, ee->engine->gt, slice, subslice)
 459                 err_printf(m, "  SAMPLER_INSTDONE[%d][%d]: 0x%08x\n",
 460                            slice, subslice,
 461                            ee->instdone.sampler[slice][subslice]);
 462
 463         for_each_ss_steering(iter, ee->engine->gt, slice, subslice)
 464                 err_printf(m, "  ROW_INSTDONE[%d][%d]: 0x%08x\n",
 465                            slice, subslice,
 466                            ee->instdone.row[slice][subslice]);
 467
 468         if (GRAPHICS_VER(m->i915) < 12)
 469                 return;
 470
 471         if (GRAPHICS_VER_FULL(m->i915) >= IP_VER(12, 55)) {
 472                 for_each_ss_steering(iter, ee->engine->gt, slice, subslice)
 473                         err_printf(m, "  GEOM_SVGUNIT_INSTDONE[%d][%d]: 0x%08x\n",
 474                                    slice, subslice,
 475                                    ee->instdone.geom_svg[slice][subslice]);
 476         }
 477
 478         err_printf(m, "  SC_INSTDONE_EXTRA: 0x%08x\n",
 479                    ee->instdone.slice_common_extra[0]);
 480         err_printf(m, "  SC_INSTDONE_EXTRA2: 0x%08x\n",
 481                    ee->instdone.slice_common_extra[1]);
 482 }
 483
 484 static void error_print_request(struct drm_i915_error_state_buf *m,
 485                                 const char *prefix,
 486                                 const struct i915_request_coredump *erq)
 487 {
 488         if (!erq->seqno)
 489                 return;
 490
 491         err_printf(m, "%s pid %d, seqno %8x:%08x%s%s, prio %d, head %08x, tail %08x\n",
 492                    prefix, erq->pid, erq->context, erq->seqno,
 493                    test_bit(DMA_FENCE_FLAG_SIGNALED_BIT,
 494                             &erq->flags) ? "!" : "",
 495                    test_bit(DMA_FENCE_FLAG_ENABLE_SIGNAL_BIT,
 496                             &erq->flags) ? "+" : "",
 497                    erq->sched_attr.priority,
 498                    erq->head, erq->tail);
 499 }
 500
 501 static void error_print_context(struct drm_i915_error_state_buf *m,
 502                                 const char *header,
 503                                 const struct i915_gem_context_coredump *ctx)
 504 {
 505         err_printf(m, "%s%s[%d] prio %d, guilty %d active %d, runtime total %lluns, avg %lluns\n",
 506                    header, ctx->comm, ctx->pid, ctx->sched_attr.priority,
 507                    ctx->guilty, ctx->active,
 508                    ctx->total_runtime, ctx->avg_runtime);
 509         err_printf(m, "  context timeline seqno %u\n", ctx->hwsp_seqno);
 510 }
 511
 512 static struct i915_vma_coredump *
 513 __find_vma(struct i915_vma_coredump *vma, const char *name)
 514 {
 515         while (vma) {
 516                 if (strcmp(vma->name, name) == 0)
 517                         return vma;
 518                 vma = vma->next;
 519         }
 520
 521         return NULL;
 522 }
 523
 524 static struct i915_vma_coredump *
 525 intel_gpu_error_find_batch(const struct intel_engine_coredump *ee)
 526 {
 527         return __find_vma(ee->vma, "batch");
 528 }
 529
 530 static void error_print_engine(struct drm_i915_error_state_buf *m,
 531                                const struct intel_engine_coredump *ee)
 532 {
 533         struct i915_vma_coredump *batch;
 534         int n;
 535
 536         err_printf(m, "%s command stream:\n", ee->engine->name);
 537         err_printf(m, "  CCID:  0x%08x\n", ee->ccid);
 538         err_printf(m, "  START: 0x%08x\n", ee->start);
 539         err_printf(m, "  HEAD:  0x%08x [0x%08x]\n", ee->head, ee->rq_head);
 540         err_printf(m, "  TAIL:  0x%08x [0x%08x, 0x%08x]\n",
 541                    ee->tail, ee->rq_post, ee->rq_tail);
 542         err_printf(m, "  CTL:   0x%08x\n", ee->ctl);
 543         err_printf(m, "  MODE:  0x%08x\n", ee->mode);
 544         err_printf(m, "  HWS:   0x%08x\n", ee->hws);
 545         err_printf(m, "  ACTHD: 0x%08x %08x\n",
 546                    (u32)(ee->acthd>>32), (u32)ee->acthd);
 547         err_printf(m, "  IPEIR: 0x%08x\n", ee->ipeir);
 548         err_printf(m, "  IPEHR: 0x%08x\n", ee->ipehr);
 549         err_printf(m, "  ESR:   0x%08x\n", ee->esr);
 550
 551         error_print_instdone(m, ee);
 552
 553         batch = intel_gpu_error_find_batch(ee);
 554         if (batch) {
 555                 u64 start = batch->gtt_offset;
 556                 u64 end = start + batch->gtt_size;
 557
 558                 err_printf(m, "  batch: [0x%08x_%08x, 0x%08x_%08x]\n",
 559                            upper_32_bits(start), lower_32_bits(start),
 560                            upper_32_bits(end), lower_32_bits(end));
 561         }
 562         if (GRAPHICS_VER(m->i915) >= 4) {
 563                 err_printf(m, "  BBADDR: 0x%08x_%08x\n",
 564                            (u32)(ee->bbaddr>>32), (u32)ee->bbaddr);
 565                 err_printf(m, "  BB_STATE: 0x%08x\n", ee->bbstate);
 566                 err_printf(m, "  INSTPS: 0x%08x\n", ee->instps);
 567         }
 568         err_printf(m, "  INSTPM: 0x%08x\n", ee->instpm);
 569         err_printf(m, "  FADDR: 0x%08x %08x\n", upper_32_bits(ee->faddr),
 570                    lower_32_bits(ee->faddr));
 571         if (GRAPHICS_VER(m->i915) >= 6) {
 572                 err_printf(m, "  RC PSMI: 0x%08x\n", ee->rc_psmi);
 573                 err_printf(m, "  FAULT_REG: 0x%08x\n", ee->fault_reg);
 574         }
 575         if (GRAPHICS_VER(m->i915) >= 11) {
 576                 err_printf(m, "  NOPID: 0x%08x\n", ee->nopid);
 577                 err_printf(m, "  EXCC: 0x%08x\n", ee->excc);
 578                 err_printf(m, "  CMD_CCTL: 0x%08x\n", ee->cmd_cctl);
 579                 err_printf(m, "  CSCMDOP: 0x%08x\n", ee->cscmdop);
 580                 err_printf(m, "  CTX_SR_CTL: 0x%08x\n", ee->ctx_sr_ctl);
 581                 err_printf(m, "  DMA_FADDR_HI: 0x%08x\n", ee->dma_faddr_hi);
 582                 err_printf(m, "  DMA_FADDR_LO: 0x%08x\n", ee->dma_faddr_lo);
 583         }
 584         if (HAS_PPGTT(m->i915)) {
 585                 err_printf(m, "  GFX_MODE: 0x%08x\n", ee->vm_info.gfx_mode);
 586
 587                 if (GRAPHICS_VER(m->i915) >= 8) {
 588                         int i;
 589                         for (i = 0; i < 4; i++)
 590                                 err_printf(m, "  PDP%d: 0x%016llx\n",
 591                                            i, ee->vm_info.pdp[i]);
 592                 } else {
 593                         err_printf(m, "  PP_DIR_BASE: 0x%08x\n",
 594                                    ee->vm_info.pp_dir_base);
 595                 }
 596         }
 597
 598         for (n = 0; n < ee->num_ports; n++) {
 599                 err_printf(m, "  ELSP[%d]:", n);
 600                 error_print_request(m, " ", &ee->execlist[n]);
 601         }
 602 }
 603
 604 void i915_error_printf(struct drm_i915_error_state_buf *e, const char *f, ...)
 605 {
 606         va_list args;
 607
 608         va_start(args, f);
 609         i915_error_vprintf(e, f, args);
 610         va_end(args);
 611 }
 612
 613 static void intel_gpu_error_print_vma(struct drm_i915_error_state_buf *m,
 614                                       const struct intel_engine_cs *engine,
 615                                       const struct i915_vma_coredump *vma)
 616 {
 617         char out[ASCII85_BUFSZ];
 618         struct page *page;
 619
 620         if (!vma)
 621                 return;
 622
 623         err_printf(m, "%s --- %s = 0x%08x %08x\n",
 624                    engine ? engine->name : "global", vma->name,
 625                    upper_32_bits(vma->gtt_offset),
 626                    lower_32_bits(vma->gtt_offset));
 627
 628         if (vma->gtt_page_sizes > I915_GTT_PAGE_SIZE_4K)
 629                 err_printf(m, "gtt_page_sizes = 0x%08x\n", vma->gtt_page_sizes);
 630
 631         err_compression_marker(m);
 632         list_for_each_entry(page, &vma->page_list, lru) {
 633                 int i, len;
 634                 const u32 *addr = page_address(page);
 635
 636                 len = PAGE_SIZE;
 637                 if (page == list_last_entry(&vma->page_list, typeof(*page), lru))
 638                         len -= vma->unused;
 639                 len = ascii85_encode_len(len);
 640
 641                 for (i = 0; i < len; i++)
 642                         err_puts(m, ascii85_encode(addr[i], out));
 643         }
 644         err_puts(m, "\n");
 645 }
 646
 647 static void err_print_capabilities(struct drm_i915_error_state_buf *m,
 648                                    struct i915_gpu_coredump *error)
 649 {
 650         struct drm_printer p = i915_error_printer(m);
 651
 652         intel_device_info_print(&error->device_info, &error->runtime_info, &p);
 653         intel_driver_caps_print(&error->driver_caps, &p);
 654 }
 655
 656 static void err_print_params(struct drm_i915_error_state_buf *m,
 657                              const struct i915_params *params)
 658 {
 659         struct drm_printer p = i915_error_printer(m);
 660
 661         i915_params_dump(params, &p);
 662 }
 663
 664 static void err_print_pciid(struct drm_i915_error_state_buf *m,
 665                             struct drm_i915_private *i915)
 666 {
 667         struct pci_dev *pdev = to_pci_dev(i915->drm.dev);
 668
 669         err_printf(m, "PCI ID: 0x%04x\n", pdev->device);
 670         err_printf(m, "PCI Revision: 0x%02x\n", pdev->revision);
 671         err_printf(m, "PCI Subsystem: %04x:%04x\n",
 672                    pdev->subsystem_vendor,
 673                    pdev->subsystem_device);
 674 }
 675
 676 static void err_print_guc_ctb(struct drm_i915_error_state_buf *m,
 677                               const char *name,
 678                               const struct intel_ctb_coredump *ctb)
 679 {
 680         if (!ctb->size)
 681                 return;
 682
 683         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",
 684                    name, ctb->raw_status, ctb->raw_head, ctb->raw_tail,
 685                    ctb->head, ctb->tail, ctb->desc_offset, ctb->cmds_offset, ctb->size);
 686 }
 687
 688 static void err_print_uc(struct drm_i915_error_state_buf *m,
 689                          const struct intel_uc_coredump *error_uc)
 690 {
 691         struct drm_printer p = i915_error_printer(m);
 692
 693         intel_uc_fw_dump(&error_uc->guc_fw, &p);
 694         intel_uc_fw_dump(&error_uc->huc_fw, &p);
 695         err_printf(m, "GuC timestamp: 0x%08x\n", error_uc->guc.timestamp);
 696         intel_gpu_error_print_vma(m, NULL, error_uc->guc.vma_log);
 697         err_printf(m, "GuC CTB fence: %d\n", error_uc->guc.last_fence);
 698         err_print_guc_ctb(m, "Send", error_uc->guc.ctb + 0);
 699         err_print_guc_ctb(m, "Recv", error_uc->guc.ctb + 1);
 700         intel_gpu_error_print_vma(m, NULL, error_uc->guc.vma_ctb);
 701 }
 702
 703 static void err_free_sgl(struct scatterlist *sgl)
 704 {
 705         while (sgl) {
 706                 struct scatterlist *sg;
 707
 708                 for (sg = sgl; !sg_is_chain(sg); sg++) {
 709                         kfree(sg_virt(sg));
 710                         if (sg_is_last(sg))
 711                                 break;
 712                 }
 713
 714                 sg = sg_is_last(sg) ? NULL : sg_chain_ptr(sg);
 715                 free_page((unsigned long)sgl);
 716                 sgl = sg;
 717         }
 718 }
 719
 720 static void err_print_gt_info(struct drm_i915_error_state_buf *m,
 721                               struct intel_gt_coredump *gt)
 722 {
 723         struct drm_printer p = i915_error_printer(m);
 724
 725         intel_gt_info_print(&gt->info, &p);
 726         intel_sseu_print_topology(gt->_gt->i915, &gt->info.sseu, &p);
 727 }
 728
 729 static void err_print_gt_display(struct drm_i915_error_state_buf *m,
 730                                  struct intel_gt_coredump *gt)
 731 {
 732         err_printf(m, "IER: 0x%08x\n", gt->ier);
 733         err_printf(m, "DERRMR: 0x%08x\n", gt->derrmr);
 734 }
 735
 736 static void err_print_gt_global_nonguc(struct drm_i915_error_state_buf *m,
 737                                        struct intel_gt_coredump *gt)
 738 {
 739         int i;
 740
 741         err_printf(m, "GT awake: %s\n", str_yes_no(gt->awake));
 742         err_printf(m, "CS timestamp frequency: %u Hz, %d ns\n",
 743                    gt->clock_frequency, gt->clock_period_ns);
 744         err_printf(m, "EIR: 0x%08x\n", gt->eir);
 745         err_printf(m, "PGTBL_ER: 0x%08x\n", gt->pgtbl_er);
 746
 747         for (i = 0; i < gt->ngtier; i++)
 748                 err_printf(m, "GTIER[%d]: 0x%08x\n", i, gt->gtier[i]);
 749 }
 750
 751 static void err_print_gt_global(struct drm_i915_error_state_buf *m,
 752                                 struct intel_gt_coredump *gt)
 753 {
 754         err_printf(m, "FORCEWAKE: 0x%08x\n", gt->forcewake);
 755
 756         if (IS_GRAPHICS_VER(m->i915, 6, 11)) {
 757                 err_printf(m, "ERROR: 0x%08x\n", gt->error);
 758                 err_printf(m, "DONE_REG: 0x%08x\n", gt->done_reg);
 759         }
 760
 761         if (GRAPHICS_VER(m->i915) >= 8)
 762                 err_printf(m, "FAULT_TLB_DATA: 0x%08x 0x%08x\n",
 763                            gt->fault_data1, gt->fault_data0);
 764
 765         if (GRAPHICS_VER(m->i915) == 7)
 766                 err_printf(m, "ERR_INT: 0x%08x\n", gt->err_int);
 767
 768         if (IS_GRAPHICS_VER(m->i915, 8, 11))
 769                 err_printf(m, "GTT_CACHE_EN: 0x%08x\n", gt->gtt_cache);
 770
 771         if (GRAPHICS_VER(m->i915) == 12)
 772                 err_printf(m, "AUX_ERR_DBG: 0x%08x\n", gt->aux_err);
 773
 774         if (GRAPHICS_VER(m->i915) >= 12) {
 775                 int i;
 776
 777                 for (i = 0; i < I915_MAX_SFC; i++) {
 778                         /*
 779                          * SFC_DONE resides in the VD forcewake domain, so it
 780                          * only exists if the corresponding VCS engine is
 781                          * present.
 782                          */
 783                         if ((gt->_gt->info.sfc_mask & BIT(i)) == 0 ||
 784                             !HAS_ENGINE(gt->_gt, _VCS(i * 2)))
 785                                 continue;
 786
 787                         err_printf(m, "  SFC_DONE[%d]: 0x%08x\n", i,
 788                                    gt->sfc_done[i]);
 789                 }
 790
 791                 err_printf(m, "  GAM_DONE: 0x%08x\n", gt->gam_done);
 792         }
 793 }
 794
 795 static void err_print_gt_fences(struct drm_i915_error_state_buf *m,
 796                                 struct intel_gt_coredump *gt)
 797 {
 798         int i;
 799
 800         for (i = 0; i < gt->nfence; i++)
 801                 err_printf(m, "  fence[%d] = %08llx\n", i, gt->fence[i]);
 802 }
 803
 804 static void err_print_gt_engines(struct drm_i915_error_state_buf *m,
 805                                  struct intel_gt_coredump *gt)
 806 {
 807         const struct intel_engine_coredump *ee;
 808
 809         for (ee = gt->engine; ee; ee = ee->next) {
 810                 const struct i915_vma_coredump *vma;
 811
 812                 if (gt->uc && gt->uc->guc.is_guc_capture) {
 813                         if (ee->guc_capture_node)
 814                                 intel_guc_capture_print_engine_node(m, ee);
 815                         else
 816                                 err_printf(m, "  Missing GuC capture node for %s\n",
 817                                            ee->engine->name);
 818                 } else {
 819                         error_print_engine(m, ee);
 820                 }
 821
 822                 err_printf(m, "  hung: %u\n", ee->hung);
 823                 err_printf(m, "  engine reset count: %u\n", ee->reset_count);
 824                 error_print_context(m, "  Active context: ", &ee->context);
 825
 826                 for (vma = ee->vma; vma; vma = vma->next)
 827                         intel_gpu_error_print_vma(m, ee->engine, vma);
 828         }
 829
 830 }
 831
 832 static void __err_print_to_sgl(struct drm_i915_error_state_buf *m,
 833                                struct i915_gpu_coredump *error)
 834 {
 835         struct drm_printer p = i915_error_printer(m);
 836         const struct intel_engine_coredump *ee;
 837         struct timespec64 ts;
 838
 839         if (*error->error_msg)
 840                 err_printf(m, "%s\n", error->error_msg);
 841         err_printf(m, "Kernel: %s %s\n",
 842                    init_utsname()->release,
 843                    init_utsname()->machine);
 844         ts = ktime_to_timespec64(error->time);
 845         err_printf(m, "Time: %lld s %ld us\n",
 846                    (s64)ts.tv_sec, ts.tv_nsec / NSEC_PER_USEC);
 847         ts = ktime_to_timespec64(error->boottime);
 848         err_printf(m, "Boottime: %lld s %ld us\n",
 849                    (s64)ts.tv_sec, ts.tv_nsec / NSEC_PER_USEC);
 850         ts = ktime_to_timespec64(error->uptime);
 851         err_printf(m, "Uptime: %lld s %ld us\n",
 852                    (s64)ts.tv_sec, ts.tv_nsec / NSEC_PER_USEC);
 853         err_printf(m, "Capture: %lu jiffies; %d ms ago\n",
 854                    error->capture, jiffies_to_msecs(jiffies - error->capture));
 855
 856         for (ee = error->gt ? error->gt->engine : NULL; ee; ee = ee->next)
 857                 err_printf(m, "Active process (on ring %s): %s [%d]\n",
 858                            ee->engine->name,
 859                            ee->context.comm,
 860                            ee->context.pid);
 861
 862         err_printf(m, "Reset count: %u\n", error->reset_count);
 863         err_printf(m, "Suspend count: %u\n", error->suspend_count);
 864         err_printf(m, "Platform: %s\n", intel_platform_name(error->device_info.platform));
 865         err_printf(m, "Subplatform: 0x%x\n",
 866                    intel_subplatform(&error->runtime_info,
 867                                      error->device_info.platform));
 868         err_print_pciid(m, m->i915);
 869
 870         err_printf(m, "IOMMU enabled?: %d\n", error->iommu);
 871
 872         err_printf(m, "RPM wakelock: %s\n", str_yes_no(error->wakelock));
 873         err_printf(m, "PM suspended: %s\n", str_yes_no(error->suspended));
 874
 875         if (error->gt) {
 876                 bool print_guc_capture = false;
 877
 878                 if (error->gt->uc && error->gt->uc->guc.is_guc_capture)
 879                         print_guc_capture = true;
 880
 881                 err_print_gt_display(m, error->gt);
 882                 err_print_gt_global_nonguc(m, error->gt);
 883                 err_print_gt_fences(m, error->gt);
 884
 885                 /*
 886                  * GuC dumped global, eng-class and eng-instance registers together
 887                  * as part of engine state dump so we print in err_print_gt_engines
 888                  */
 889                 if (!print_guc_capture)
 890                         err_print_gt_global(m, error->gt);
 891
 892                 err_print_gt_engines(m, error->gt);
 893
 894                 if (error->gt->uc)
 895                         err_print_uc(m, error->gt->uc);
 896
 897                 err_print_gt_info(m, error->gt);
 898         }
 899
 900         err_print_capabilities(m, error);
 901         err_print_params(m, &error->params);
 902
 903         intel_display_snapshot_print(error->display_snapshot, &p);
 904 }
 905
 906 static int err_print_to_sgl(struct i915_gpu_coredump *error)
 907 {
 908         struct drm_i915_error_state_buf m;
 909
 910         if (IS_ERR(error))
 911                 return PTR_ERR(error);
 912
 913         if (READ_ONCE(error->sgl))
 914                 return 0;
 915
 916         memset(&m, 0, sizeof(m));
 917         m.i915 = error->i915;
 918
 919         __err_print_to_sgl(&m, error);
 920
 921         if (m.buf) {
 922                 __sg_set_buf(m.cur++, m.buf, m.bytes, m.iter);
 923                 m.bytes = 0;
 924                 m.buf = NULL;
 925         }
 926         if (m.cur) {
 927                 GEM_BUG_ON(m.end < m.cur);
 928                 sg_mark_end(m.cur - 1);
 929         }
 930         GEM_BUG_ON(m.sgl && !m.cur);
 931
 932         if (m.err) {
 933                 err_free_sgl(m.sgl);
 934                 return m.err;
 935         }
 936
 937         if (cmpxchg(&error->sgl, NULL, m.sgl))
 938                 err_free_sgl(m.sgl);
 939
 940         return 0;
 941 }
 942
 943 ssize_t i915_gpu_coredump_copy_to_buffer(struct i915_gpu_coredump *error,
 944                                          char *buf, loff_t off, size_t rem)
 945 {
 946         struct scatterlist *sg;
 947         size_t count;
 948         loff_t pos;
 949         int err;
 950
 951         if (!error || !rem)
 952                 return 0;
 953
 954         err = err_print_to_sgl(error);
 955         if (err)
 956                 return err;
 957
 958         sg = READ_ONCE(error->fit);
 959         if (!sg || off < sg->dma_address)
 960                 sg = error->sgl;
 961         if (!sg)
 962                 return 0;
 963
 964         pos = sg->dma_address;
 965         count = 0;
 966         do {
 967                 size_t len, start;
 968
 969                 if (sg_is_chain(sg)) {
 970                         sg = sg_chain_ptr(sg);
 971                         GEM_BUG_ON(sg_is_chain(sg));
 972                 }
 973
 974                 len = sg->length;
 975                 if (pos + len <= off) {
 976                         pos += len;
 977                         continue;
 978                 }
 979
 980                 start = sg->offset;
 981                 if (pos < off) {
 982                         GEM_BUG_ON(off - pos > len);
 983                         len -= off - pos;
 984                         start += off - pos;
 985                         pos = off;
 986                 }
 987
 988                 len = min(len, rem);
 989                 GEM_BUG_ON(!len || len > sg->length);
 990
 991                 memcpy(buf, page_address(sg_page(sg)) + start, len);
 992
 993                 count += len;
 994                 pos += len;
 995
 996                 buf += len;
 997                 rem -= len;
 998                 if (!rem) {
 999                         WRITE_ONCE(error->fit, sg);
1000                         break;
1001                 }
1002         } while (!sg_is_last(sg++));
1003
1004         return count;
1005 }
1006
1007 static void i915_vma_coredump_free(struct i915_vma_coredump *vma)
1008 {
1009         while (vma) {
1010                 struct i915_vma_coredump *next = vma->next;
1011                 struct page *page, *n;
1012
1013                 list_for_each_entry_safe(page, n, &vma->page_list, lru) {
1014                         list_del_init(&page->lru);
1015                         __free_page(page);
1016                 }
1017
1018                 kfree(vma);
1019                 vma = next;
1020         }
1021 }
1022
1023 static void cleanup_params(struct i915_gpu_coredump *error)
1024 {
1025         i915_params_free(&error->params);
1026 }
1027
1028 static void cleanup_uc(struct intel_uc_coredump *uc)
1029 {
1030         kfree(uc->guc_fw.file_selected.path);
1031         kfree(uc->huc_fw.file_selected.path);
1032         kfree(uc->guc_fw.file_wanted.path);
1033         kfree(uc->huc_fw.file_wanted.path);
1034         i915_vma_coredump_free(uc->guc.vma_log);
1035         i915_vma_coredump_free(uc->guc.vma_ctb);
1036
1037         kfree(uc);
1038 }
1039
1040 static void cleanup_gt(struct intel_gt_coredump *gt)
1041 {
1042         while (gt->engine) {
1043                 struct intel_engine_coredump *ee = gt->engine;
1044
1045                 gt->engine = ee->next;
1046
1047                 i915_vma_coredump_free(ee->vma);
1048                 intel_guc_capture_free_node(ee);
1049                 kfree(ee);
1050         }
1051
1052         if (gt->uc)
1053                 cleanup_uc(gt->uc);
1054
1055         kfree(gt);
1056 }
1057
1058 void __i915_gpu_coredump_free(struct kref *error_ref)
1059 {
1060         struct i915_gpu_coredump *error =
1061                 container_of(error_ref, typeof(*error), ref);
1062
1063         while (error->gt) {
1064                 struct intel_gt_coredump *gt = error->gt;
1065
1066                 error->gt = gt->next;
1067                 cleanup_gt(gt);
1068         }
1069
1070         intel_display_snapshot_free(error->display_snapshot);
1071
1072         cleanup_params(error);
1073
1074         err_free_sgl(error->sgl);
1075         kfree(error);
1076 }
1077
1078 static struct i915_vma_coredump *
1079 i915_vma_coredump_create(const struct intel_gt *gt,
1080                          const struct i915_vma_resource *vma_res,
1081                          struct i915_vma_compress *compress,
1082                          const char *name)
1083
1084 {
1085         struct i915_ggtt *ggtt = gt->ggtt;
1086         const u64 slot = ggtt->error_capture.start;
1087         struct i915_vma_coredump *dst;
1088         struct sgt_iter iter;
1089         int ret;
1090
1091         might_sleep();
1092
1093         if (!vma_res || !vma_res->bi.pages || !compress)
1094                 return NULL;
1095
1096         dst = kmalloc(sizeof(*dst), ALLOW_FAIL);
1097         if (!dst)
1098                 return NULL;
1099
1100         if (!compress_start(compress)) {
1101                 kfree(dst);
1102                 return NULL;
1103         }
1104
1105         INIT_LIST_HEAD(&dst->page_list);
1106         strscpy(dst->name, name);
1107         dst->next = NULL;
1108
1109         dst->gtt_offset = vma_res->start;
1110         dst->gtt_size = vma_res->node_size;
1111         dst->gtt_page_sizes = vma_res->page_sizes_gtt;
1112         dst->unused = 0;
1113
1114         ret = -EINVAL;
1115         if (drm_mm_node_allocated(&ggtt->error_capture)) {
1116                 void __iomem *s;
1117                 dma_addr_t dma;
1118
1119                 for_each_sgt_daddr(dma, iter, vma_res->bi.pages) {
1120                         mutex_lock(&ggtt->error_mutex);
1121                         if (ggtt->vm.raw_insert_page)
1122                                 ggtt->vm.raw_insert_page(&ggtt->vm, dma, slot,
1123                                                          i915_gem_get_pat_index(gt->i915,
1124                                                                                 I915_CACHE_NONE),
1125                                                          0);
1126                         else
1127                                 ggtt->vm.insert_page(&ggtt->vm, dma, slot,
1128                                                      i915_gem_get_pat_index(gt->i915,
1129                                                                             I915_CACHE_NONE),
1130                                                      0);
1131                         mb();
1132
1133                         s = io_mapping_map_wc(&ggtt->iomap, slot, PAGE_SIZE);
1134                         ret = compress_page(compress,
1135                                             (void  __force *)s, dst,
1136                                             true);
1137                         io_mapping_unmap(s);
1138
1139                         mb();
1140                         ggtt->vm.clear_range(&ggtt->vm, slot, PAGE_SIZE);
1141                         mutex_unlock(&ggtt->error_mutex);
1142                         if (ret)
1143                                 break;
1144                 }
1145         } else if (vma_res->bi.lmem) {
1146                 struct intel_memory_region *mem = vma_res->mr;
1147                 dma_addr_t dma;
1148
1149                 for_each_sgt_daddr(dma, iter, vma_res->bi.pages) {
1150                         dma_addr_t offset = dma - mem->region.start;
1151                         void __iomem *s;
1152
1153                         if (offset + PAGE_SIZE > resource_size(&mem->io)) {
1154                                 ret = -EINVAL;
1155                                 break;
1156                         }
1157
1158                         s = io_mapping_map_wc(&mem->iomap, offset, PAGE_SIZE);
1159                         ret = compress_page(compress,
1160                                             (void __force *)s, dst,
1161                                             true);
1162                         io_mapping_unmap(s);
1163                         if (ret)
1164                                 break;
1165                 }
1166         } else {
1167                 struct page *page;
1168
1169                 for_each_sgt_page(page, iter, vma_res->bi.pages) {
1170                         void *s;
1171
1172                         drm_clflush_pages(&page, 1);
1173
1174                         s = kmap_local_page(page);
1175                         ret = compress_page(compress, s, dst, false);
1176                         kunmap_local(s);
1177
1178                         drm_clflush_pages(&page, 1);
1179
1180                         if (ret)
1181                                 break;
1182                 }
1183         }
1184
1185         if (ret || compress_flush(compress, dst)) {
1186                 struct page *page, *n;
1187
1188                 list_for_each_entry_safe_reverse(page, n, &dst->page_list, lru) {
1189                         list_del_init(&page->lru);
1190                         pool_free(&compress->pool, page_address(page));
1191                 }
1192
1193                 kfree(dst);
1194                 dst = NULL;
1195         }
1196         compress_finish(compress);
1197
1198         return dst;
1199 }
1200
1201 static void gt_record_fences(struct intel_gt_coredump *gt)
1202 {
1203         struct i915_ggtt *ggtt = gt->_gt->ggtt;
1204         struct intel_uncore *uncore = gt->_gt->uncore;
1205         int i;
1206
1207         if (GRAPHICS_VER(uncore->i915) >= 6) {
1208                 for (i = 0; i < ggtt->num_fences; i++)
1209                         gt->fence[i] =
1210                                 intel_uncore_read64(uncore,
1211                                                     FENCE_REG_GEN6_LO(i));
1212         } else if (GRAPHICS_VER(uncore->i915) >= 4) {
1213                 for (i = 0; i < ggtt->num_fences; i++)
1214                         gt->fence[i] =
1215                                 intel_uncore_read64(uncore,
1216                                                     FENCE_REG_965_LO(i));
1217         } else {
1218                 for (i = 0; i < ggtt->num_fences; i++)
1219                         gt->fence[i] =
1220                                 intel_uncore_read(uncore, FENCE_REG(i));
1221         }
1222         gt->nfence = i;
1223 }
1224
1225 static void engine_record_registers(struct intel_engine_coredump *ee)
1226 {
1227         const struct intel_engine_cs *engine = ee->engine;
1228         struct drm_i915_private *i915 = engine->i915;
1229
1230         if (GRAPHICS_VER(i915) >= 6) {
1231                 ee->rc_psmi = ENGINE_READ(engine, RING_PSMI_CTL);
1232
1233                 /*
1234                  * For the media GT, this ring fault register is not replicated,
1235                  * so don't do multicast/replicated register read/write
1236                  * operation on it.
1237                  */
1238                 if (MEDIA_VER(i915) >= 13 && engine->gt->type == GT_MEDIA)
1239                         ee->fault_reg = intel_uncore_read(engine->uncore,
1240                                                           XELPMP_RING_FAULT_REG);
1241                 else if (GRAPHICS_VER_FULL(i915) >= IP_VER(12, 55))
1242                         ee->fault_reg = intel_gt_mcr_read_any(engine->gt,
1243                                                               XEHP_RING_FAULT_REG);
1244                 else if (GRAPHICS_VER(i915) >= 12)
1245                         ee->fault_reg = intel_uncore_read(engine->uncore,
1246                                                           GEN12_RING_FAULT_REG);
1247                 else if (GRAPHICS_VER(i915) >= 8)
1248                         ee->fault_reg = intel_uncore_read(engine->uncore,
1249                                                           GEN8_RING_FAULT_REG);
1250                 else
1251                         ee->fault_reg = GEN6_RING_FAULT_REG_READ(engine);
1252         }
1253
1254         if (GRAPHICS_VER(i915) >= 4) {
1255                 ee->esr = ENGINE_READ(engine, RING_ESR);
1256                 ee->faddr = ENGINE_READ(engine, RING_DMA_FADD);
1257                 ee->ipeir = ENGINE_READ(engine, RING_IPEIR);
1258                 ee->ipehr = ENGINE_READ(engine, RING_IPEHR);
1259                 ee->instps = ENGINE_READ(engine, RING_INSTPS);
1260                 ee->bbaddr = ENGINE_READ(engine, RING_BBADDR);
1261                 ee->ccid = ENGINE_READ(engine, CCID);
1262                 if (GRAPHICS_VER(i915) >= 8) {
1263                         ee->faddr |= (u64)ENGINE_READ(engine, RING_DMA_FADD_UDW) << 32;
1264                         ee->bbaddr |= (u64)ENGINE_READ(engine, RING_BBADDR_UDW) << 32;
1265                 }
1266                 ee->bbstate = ENGINE_READ(engine, RING_BBSTATE);
1267         } else {
1268                 ee->faddr = ENGINE_READ(engine, DMA_FADD_I8XX);
1269                 ee->ipeir = ENGINE_READ(engine, IPEIR);
1270                 ee->ipehr = ENGINE_READ(engine, IPEHR);
1271         }
1272
1273         if (GRAPHICS_VER(i915) >= 11) {
1274                 ee->cmd_cctl = ENGINE_READ(engine, RING_CMD_CCTL);
1275                 ee->cscmdop = ENGINE_READ(engine, RING_CSCMDOP);
1276                 ee->ctx_sr_ctl = ENGINE_READ(engine, RING_CTX_SR_CTL);
1277                 ee->dma_faddr_hi = ENGINE_READ(engine, RING_DMA_FADD_UDW);
1278                 ee->dma_faddr_lo = ENGINE_READ(engine, RING_DMA_FADD);
1279                 ee->nopid = ENGINE_READ(engine, RING_NOPID);
1280                 ee->excc = ENGINE_READ(engine, RING_EXCC);
1281         }
1282
1283         intel_engine_get_instdone(engine, &ee->instdone);
1284
1285         ee->instpm = ENGINE_READ(engine, RING_INSTPM);
1286         ee->acthd = intel_engine_get_active_head(engine);
1287         ee->start = ENGINE_READ(engine, RING_START);
1288         ee->head = ENGINE_READ(engine, RING_HEAD);
1289         ee->tail = ENGINE_READ(engine, RING_TAIL);
1290         ee->ctl = ENGINE_READ(engine, RING_CTL);
1291         if (GRAPHICS_VER(i915) > 2)
1292                 ee->mode = ENGINE_READ(engine, RING_MI_MODE);
1293
1294         if (!HWS_NEEDS_PHYSICAL(i915)) {
1295                 i915_reg_t mmio;
1296
1297                 if (GRAPHICS_VER(i915) == 7) {
1298                         switch (engine->id) {
1299                         default:
1300                                 MISSING_CASE(engine->id);
1301                                 fallthrough;
1302                         case RCS0:
1303                                 mmio = RENDER_HWS_PGA_GEN7;
1304                                 break;
1305                         case BCS0:
1306                                 mmio = BLT_HWS_PGA_GEN7;
1307                                 break;
1308                         case VCS0:
1309                                 mmio = BSD_HWS_PGA_GEN7;
1310                                 break;
1311                         case VECS0:
1312                                 mmio = VEBOX_HWS_PGA_GEN7;
1313                                 break;
1314                         }
1315                 } else if (GRAPHICS_VER(engine->i915) == 6) {
1316                         mmio = RING_HWS_PGA_GEN6(engine->mmio_base);
1317                 } else {
1318                         /* XXX: gen8 returns to sanity */
1319                         mmio = RING_HWS_PGA(engine->mmio_base);
1320                 }
1321
1322                 ee->hws = intel_uncore_read(engine->uncore, mmio);
1323         }
1324
1325         ee->reset_count = i915_reset_engine_count(&i915->gpu_error, engine);
1326
1327         if (HAS_PPGTT(i915)) {
1328                 int i;
1329
1330                 ee->vm_info.gfx_mode = ENGINE_READ(engine, RING_MODE_GEN7);
1331
1332                 if (GRAPHICS_VER(i915) == 6) {
1333                         ee->vm_info.pp_dir_base =
1334                                 ENGINE_READ(engine, RING_PP_DIR_BASE_READ);
1335                 } else if (GRAPHICS_VER(i915) == 7) {
1336                         ee->vm_info.pp_dir_base =
1337                                 ENGINE_READ(engine, RING_PP_DIR_BASE);
1338                 } else if (GRAPHICS_VER(i915) >= 8) {
1339                         u32 base = engine->mmio_base;
1340
1341                         for (i = 0; i < 4; i++) {
1342                                 ee->vm_info.pdp[i] =
1343                                         intel_uncore_read(engine->uncore,
1344                                                           GEN8_RING_PDP_UDW(base, i));
1345                                 ee->vm_info.pdp[i] <<= 32;
1346                                 ee->vm_info.pdp[i] |=
1347                                         intel_uncore_read(engine->uncore,
1348                                                           GEN8_RING_PDP_LDW(base, i));
1349                         }
1350                 }
1351         }
1352 }
1353
1354 static void record_request(const struct i915_request *request,
1355                            struct i915_request_coredump *erq)
1356 {
1357         erq->flags = request->fence.flags;
1358         erq->context = request->fence.context;
1359         erq->seqno = request->fence.seqno;
1360         erq->sched_attr = request->sched.attr;
1361         erq->head = request->head;
1362         erq->tail = request->tail;
1363
1364         erq->pid = 0;
1365         rcu_read_lock();
1366         if (!intel_context_is_closed(request->context)) {
1367                 const struct i915_gem_context *ctx;
1368
1369                 ctx = rcu_dereference(request->context->gem_context);
1370                 if (ctx)
1371                         erq->pid = pid_nr(ctx->pid);
1372         }
1373         rcu_read_unlock();
1374 }
1375
1376 static void engine_record_execlists(struct intel_engine_coredump *ee)
1377 {
1378         const struct intel_engine_execlists * const el = &ee->engine->execlists;
1379         struct i915_request * const *port = el->active;
1380         unsigned int n = 0;
1381
1382         while (*port)
1383                 record_request(*port++, &ee->execlist[n++]);
1384
1385         ee->num_ports = n;
1386 }
1387
1388 static bool record_context(struct i915_gem_context_coredump *e,
1389                            struct intel_context *ce)
1390 {
1391         struct i915_gem_context *ctx;
1392         struct task_struct *task;
1393         bool simulated;
1394
1395         rcu_read_lock();
1396         ctx = rcu_dereference(ce->gem_context);
1397         if (ctx && !kref_get_unless_zero(&ctx->ref))
1398                 ctx = NULL;
1399         rcu_read_unlock();
1400         if (!ctx)
1401                 return true;
1402
1403         rcu_read_lock();
1404         task = pid_task(ctx->pid, PIDTYPE_PID);
1405         if (task) {
1406                 strscpy(e->comm, task->comm);
1407                 e->pid = task->pid;
1408         }
1409         rcu_read_unlock();
1410
1411         e->sched_attr = ctx->sched;
1412         e->guilty = atomic_read(&ctx->guilty_count);
1413         e->active = atomic_read(&ctx->active_count);
1414         e->hwsp_seqno = (ce->timeline && ce->timeline->hwsp_seqno) ?
1415                                 *ce->timeline->hwsp_seqno : ~0U;
1416
1417         e->total_runtime = intel_context_get_total_runtime_ns(ce);
1418         e->avg_runtime = intel_context_get_avg_runtime_ns(ce);
1419
1420         simulated = i915_gem_context_no_error_capture(ctx);
1421
1422         i915_gem_context_put(ctx);
1423         return simulated;
1424 }
1425
1426 struct intel_engine_capture_vma {
1427         struct intel_engine_capture_vma *next;
1428         struct i915_vma_resource *vma_res;
1429         char name[16];
1430         bool lockdep_cookie;
1431 };
1432
1433 static struct intel_engine_capture_vma *
1434 capture_vma_snapshot(struct intel_engine_capture_vma *next,
1435                      struct i915_vma_resource *vma_res,
1436                      gfp_t gfp, const char *name)
1437 {
1438         struct intel_engine_capture_vma *c;
1439
1440         if (!vma_res)
1441                 return next;
1442
1443         c = kmalloc(sizeof(*c), gfp);
1444         if (!c)
1445                 return next;
1446
1447         if (!i915_vma_resource_hold(vma_res, &c->lockdep_cookie)) {
1448                 kfree(c);
1449                 return next;
1450         }
1451
1452         strscpy(c->name, name);
1453         c->vma_res = i915_vma_resource_get(vma_res);
1454
1455         c->next = next;
1456         return c;
1457 }
1458
1459 static struct intel_engine_capture_vma *
1460 capture_vma(struct intel_engine_capture_vma *next,
1461             struct i915_vma *vma,
1462             const char *name,
1463             gfp_t gfp)
1464 {
1465         if (!vma)
1466                 return next;
1467
1468         /*
1469          * If the vma isn't pinned, then the vma should be snapshotted
1470          * to a struct i915_vma_snapshot at command submission time.
1471          * Not here.
1472          */
1473         if (GEM_WARN_ON(!i915_vma_is_pinned(vma)))
1474                 return next;
1475
1476         next = capture_vma_snapshot(next, vma->resource, gfp, name);
1477
1478         return next;
1479 }
1480
1481 static struct intel_engine_capture_vma *
1482 capture_user(struct intel_engine_capture_vma *capture,
1483              const struct i915_request *rq,
1484              gfp_t gfp)
1485 {
1486         struct i915_capture_list *c;
1487
1488         for (c = rq->capture_list; c; c = c->next)
1489                 capture = capture_vma_snapshot(capture, c->vma_res, gfp,
1490                                                "user");
1491
1492         return capture;
1493 }
1494
1495 static void add_vma(struct intel_engine_coredump *ee,
1496                     struct i915_vma_coredump *vma)
1497 {
1498         if (vma) {
1499                 vma->next = ee->vma;
1500                 ee->vma = vma;
1501         }
1502 }
1503
1504 static struct i915_vma_coredump *
1505 create_vma_coredump(const struct intel_gt *gt, struct i915_vma *vma,
1506                     const char *name, struct i915_vma_compress *compress)
1507 {
1508         struct i915_vma_coredump *ret = NULL;
1509         struct i915_vma_resource *vma_res;
1510         bool lockdep_cookie;
1511
1512         if (!vma)
1513                 return NULL;
1514
1515         vma_res = vma->resource;
1516
1517         if (i915_vma_resource_hold(vma_res, &lockdep_cookie)) {
1518                 ret = i915_vma_coredump_create(gt, vma_res, compress, name);
1519                 i915_vma_resource_unhold(vma_res, lockdep_cookie);
1520         }
1521
1522         return ret;
1523 }
1524
1525 static void add_vma_coredump(struct intel_engine_coredump *ee,
1526                              const struct intel_gt *gt,
1527                              struct i915_vma *vma,
1528                              const char *name,
1529                              struct i915_vma_compress *compress)
1530 {
1531         add_vma(ee, create_vma_coredump(gt, vma, name, compress));
1532 }
1533
1534 struct intel_engine_coredump *
1535 intel_engine_coredump_alloc(struct intel_engine_cs *engine, gfp_t gfp, u32 dump_flags)
1536 {
1537         struct intel_engine_coredump *ee;
1538
1539         ee = kzalloc(sizeof(*ee), gfp);
1540         if (!ee)
1541                 return NULL;
1542
1543         ee->engine = engine;
1544
1545         if (!(dump_flags & CORE_DUMP_FLAG_IS_GUC_CAPTURE)) {
1546                 engine_record_registers(ee);
1547                 engine_record_execlists(ee);
1548         }
1549
1550         return ee;
1551 }
1552
1553 static struct intel_engine_capture_vma *
1554 engine_coredump_add_context(struct intel_engine_coredump *ee,
1555                             struct intel_context *ce,
1556                             gfp_t gfp)
1557 {
1558         struct intel_engine_capture_vma *vma = NULL;
1559
1560         ee->simulated |= record_context(&ee->context, ce);
1561         if (ee->simulated)
1562                 return NULL;
1563
1564         /*
1565          * We need to copy these to an anonymous buffer
1566          * as the simplest method to avoid being overwritten
1567          * by userspace.
1568          */
1569         vma = capture_vma(vma, ce->ring->vma, "ring", gfp);
1570         vma = capture_vma(vma, ce->state, "HW context", gfp);
1571
1572         return vma;
1573 }
1574
1575 struct intel_engine_capture_vma *
1576 intel_engine_coredump_add_request(struct intel_engine_coredump *ee,
1577                                   struct i915_request *rq,
1578                                   gfp_t gfp)
1579 {
1580         struct intel_engine_capture_vma *vma;
1581
1582         vma = engine_coredump_add_context(ee, rq->context, gfp);
1583         if (!vma)
1584                 return NULL;
1585
1586         /*
1587          * We need to copy these to an anonymous buffer
1588          * as the simplest method to avoid being overwritten
1589          * by userspace.
1590          */
1591         vma = capture_vma_snapshot(vma, rq->batch_res, gfp, "batch");
1592         vma = capture_user(vma, rq, gfp);
1593
1594         ee->rq_head = rq->head;
1595         ee->rq_post = rq->postfix;
1596         ee->rq_tail = rq->tail;
1597
1598         return vma;
1599 }
1600
1601 void
1602 intel_engine_coredump_add_vma(struct intel_engine_coredump *ee,
1603                               struct intel_engine_capture_vma *capture,
1604                               struct i915_vma_compress *compress)
1605 {
1606         const struct intel_engine_cs *engine = ee->engine;
1607
1608         while (capture) {
1609                 struct intel_engine_capture_vma *this = capture;
1610                 struct i915_vma_resource *vma_res = this->vma_res;
1611
1612                 add_vma(ee,
1613                         i915_vma_coredump_create(engine->gt, vma_res,
1614                                                  compress, this->name));
1615
1616                 i915_vma_resource_unhold(vma_res, this->lockdep_cookie);
1617                 i915_vma_resource_put(vma_res);
1618
1619                 capture = this->next;
1620                 kfree(this);
1621         }
1622
1623         add_vma_coredump(ee, engine->gt, engine->status_page.vma,
1624                          "HW Status", compress);
1625
1626         add_vma_coredump(ee, engine->gt, engine->wa_ctx.vma,
1627                          "WA context", compress);
1628 }
1629
1630 static struct intel_engine_coredump *
1631 capture_engine(struct intel_engine_cs *engine,
1632                struct i915_vma_compress *compress,
1633                u32 dump_flags)
1634 {
1635         struct intel_engine_capture_vma *capture = NULL;
1636         struct intel_engine_coredump *ee;
1637         struct intel_context *ce = NULL;
1638         struct i915_request *rq = NULL;
1639
1640         ee = intel_engine_coredump_alloc(engine, ALLOW_FAIL, dump_flags);
1641         if (!ee)
1642                 return NULL;
1643
1644         intel_engine_get_hung_entity(engine, &ce, &rq);
1645         if (rq && !i915_request_started(rq)) {
1646                 /*
1647                  * We want to know also what is the guc_id of the context,
1648                  * but if we don't have the context reference, then skip
1649                  * printing it.
1650                  */
1651                 if (ce)
1652                         drm_info(&engine->gt->i915->drm,
1653                                  "Got hung context on %s with active request %lld:%lld [0x%04X] not yet started\n",
1654                                  engine->name, rq->fence.context, rq->fence.seqno, ce->guc_id.id);
1655                 else
1656                         drm_info(&engine->gt->i915->drm,
1657                                  "Got hung context on %s with active request %lld:%lld not yet started\n",
1658                                  engine->name, rq->fence.context, rq->fence.seqno);
1659         }
1660
1661         if (rq) {
1662                 capture = intel_engine_coredump_add_request(ee, rq, ATOMIC_MAYFAIL);
1663                 i915_request_put(rq);
1664         } else if (ce) {
1665                 capture = engine_coredump_add_context(ee, ce, ATOMIC_MAYFAIL);
1666         }
1667
1668         if (capture) {
1669                 intel_engine_coredump_add_vma(ee, capture, compress);
1670
1671                 if (dump_flags & CORE_DUMP_FLAG_IS_GUC_CAPTURE)
1672                         intel_guc_capture_get_matching_node(engine->gt, ee, ce);
1673         } else {
1674                 kfree(ee);
1675                 ee = NULL;
1676         }
1677
1678         return ee;
1679 }
1680
1681 static void
1682 gt_record_engines(struct intel_gt_coredump *gt,
1683                   intel_engine_mask_t engine_mask,
1684                   struct i915_vma_compress *compress,
1685                   u32 dump_flags)
1686 {
1687         struct intel_engine_cs *engine;
1688         enum intel_engine_id id;
1689
1690         for_each_engine(engine, gt->_gt, id) {
1691                 struct intel_engine_coredump *ee;
1692
1693                 /* Refill our page pool before entering atomic section */
1694                 pool_refill(&compress->pool, ALLOW_FAIL);
1695
1696                 ee = capture_engine(engine, compress, dump_flags);
1697                 if (!ee)
1698                         continue;
1699
1700                 ee->hung = engine->mask & engine_mask;
1701
1702                 gt->simulated |= ee->simulated;
1703                 if (ee->simulated) {
1704                         if (dump_flags & CORE_DUMP_FLAG_IS_GUC_CAPTURE)
1705                                 intel_guc_capture_free_node(ee);
1706                         kfree(ee);
1707                         continue;
1708                 }
1709
1710                 ee->next = gt->engine;
1711                 gt->engine = ee;
1712         }
1713 }
1714
1715 static void gt_record_guc_ctb(struct intel_ctb_coredump *saved,
1716                               const struct intel_guc_ct_buffer *ctb,
1717                               const void *blob_ptr, struct intel_guc *guc)
1718 {
1719         if (!ctb || !ctb->desc)
1720                 return;
1721
1722         saved->raw_status = ctb->desc->status;
1723         saved->raw_head = ctb->desc->head;
1724         saved->raw_tail = ctb->desc->tail;
1725         saved->head = ctb->head;
1726         saved->tail = ctb->tail;
1727         saved->size = ctb->size;
1728         saved->desc_offset = ((void *)ctb->desc) - blob_ptr;
1729         saved->cmds_offset = ((void *)ctb->cmds) - blob_ptr;
1730 }
1731
1732 static struct intel_uc_coredump *
1733 gt_record_uc(struct intel_gt_coredump *gt,
1734              struct i915_vma_compress *compress)
1735 {
1736         const struct intel_uc *uc = &gt->_gt->uc;
1737         struct intel_uc_coredump *error_uc;
1738
1739         error_uc = kzalloc(sizeof(*error_uc), ALLOW_FAIL);
1740         if (!error_uc)
1741                 return NULL;
1742
1743         memcpy(&error_uc->guc_fw, &uc->guc.fw, sizeof(uc->guc.fw));
1744         memcpy(&error_uc->huc_fw, &uc->huc.fw, sizeof(uc->huc.fw));
1745
1746         error_uc->guc_fw.file_selected.path = kstrdup(uc->guc.fw.file_selected.path, ALLOW_FAIL);
1747         error_uc->huc_fw.file_selected.path = kstrdup(uc->huc.fw.file_selected.path, ALLOW_FAIL);
1748         error_uc->guc_fw.file_wanted.path = kstrdup(uc->guc.fw.file_wanted.path, ALLOW_FAIL);
1749         error_uc->huc_fw.file_wanted.path = kstrdup(uc->huc.fw.file_wanted.path, ALLOW_FAIL);
1750
1751         /*
1752          * Save the GuC log and include a timestamp reference for converting the
1753          * log times to system times (in conjunction with the error->boottime and
1754          * gt->clock_frequency fields saved elsewhere).
1755          */
1756         error_uc->guc.timestamp = intel_uncore_read(gt->_gt->uncore, GUCPMTIMESTAMP);
1757         error_uc->guc.vma_log = create_vma_coredump(gt->_gt, uc->guc.log.vma,
1758                                                     "GuC log buffer", compress);
1759         error_uc->guc.vma_ctb = create_vma_coredump(gt->_gt, uc->guc.ct.vma,
1760                                                     "GuC CT buffer", compress);
1761         error_uc->guc.last_fence = uc->guc.ct.requests.last_fence;
1762         gt_record_guc_ctb(error_uc->guc.ctb + 0, &uc->guc.ct.ctbs.send,
1763                           uc->guc.ct.ctbs.send.desc, (struct intel_guc *)&uc->guc);
1764         gt_record_guc_ctb(error_uc->guc.ctb + 1, &uc->guc.ct.ctbs.recv,
1765                           uc->guc.ct.ctbs.send.desc, (struct intel_guc *)&uc->guc);
1766
1767         return error_uc;
1768 }
1769
1770 /* Capture display registers. */
1771 static void gt_record_display_regs(struct intel_gt_coredump *gt)
1772 {
1773         struct intel_uncore *uncore = gt->_gt->uncore;
1774         struct drm_i915_private *i915 = uncore->i915;
1775
1776         if (DISPLAY_VER(i915) >= 6 && DISPLAY_VER(i915) < 20)
1777                 gt->derrmr = intel_uncore_read(uncore, DERRMR);
1778
1779         if (GRAPHICS_VER(i915) >= 8)
1780                 gt->ier = intel_uncore_read(uncore, GEN8_DE_MISC_IER);
1781         else if (IS_VALLEYVIEW(i915))
1782                 gt->ier = intel_uncore_read(uncore, VLV_IER);
1783         else if (HAS_PCH_SPLIT(i915))
1784                 gt->ier = intel_uncore_read(uncore, DEIER);
1785         else if (GRAPHICS_VER(i915) == 2)
1786                 gt->ier = intel_uncore_read16(uncore, GEN2_IER);
1787         else
1788                 gt->ier = intel_uncore_read(uncore, GEN2_IER);
1789 }
1790
1791 /* Capture all other registers that GuC doesn't capture. */
1792 static void gt_record_global_nonguc_regs(struct intel_gt_coredump *gt)
1793 {
1794         struct intel_uncore *uncore = gt->_gt->uncore;
1795         struct drm_i915_private *i915 = uncore->i915;
1796         int i;
1797
1798         if (IS_VALLEYVIEW(i915)) {
1799                 gt->gtier[0] = intel_uncore_read(uncore, GTIER);
1800                 gt->ngtier = 1;
1801         } else if (GRAPHICS_VER(i915) >= 11) {
1802                 gt->gtier[0] =
1803                         intel_uncore_read(uncore,
1804                                           GEN11_RENDER_COPY_INTR_ENABLE);
1805                 gt->gtier[1] =
1806                         intel_uncore_read(uncore, GEN11_VCS_VECS_INTR_ENABLE);
1807                 gt->gtier[2] =
1808                         intel_uncore_read(uncore, GEN11_GUC_SG_INTR_ENABLE);
1809                 gt->gtier[3] =
1810                         intel_uncore_read(uncore,
1811                                           GEN11_GPM_WGBOXPERF_INTR_ENABLE);
1812                 gt->gtier[4] =
1813                         intel_uncore_read(uncore,
1814                                           GEN11_CRYPTO_RSVD_INTR_ENABLE);
1815                 gt->gtier[5] =
1816                         intel_uncore_read(uncore,
1817                                           GEN11_GUNIT_CSME_INTR_ENABLE);
1818                 gt->ngtier = 6;
1819         } else if (GRAPHICS_VER(i915) >= 8) {
1820                 for (i = 0; i < 4; i++)
1821                         gt->gtier[i] =
1822                                 intel_uncore_read(uncore, GEN8_GT_IER(i));
1823                 gt->ngtier = 4;
1824         } else if (HAS_PCH_SPLIT(i915)) {
1825                 gt->gtier[0] = intel_uncore_read(uncore, GTIER);
1826                 gt->ngtier = 1;
1827         }
1828
1829         gt->eir = intel_uncore_read(uncore, EIR);
1830         gt->pgtbl_er = intel_uncore_read(uncore, PGTBL_ER);
1831 }
1832
1833 /*
1834  * Capture all registers that relate to workload submission.
1835  * NOTE: In GuC submission, when GuC resets an engine, it can dump these for us
1836  */
1837 static void gt_record_global_regs(struct intel_gt_coredump *gt)
1838 {
1839         struct intel_uncore *uncore = gt->_gt->uncore;
1840         struct drm_i915_private *i915 = uncore->i915;
1841         int i;
1842
1843         /*
1844          * General organization
1845          * 1. Registers specific to a single generation
1846          * 2. Registers which belong to multiple generations
1847          * 3. Feature specific registers.
1848          * 4. Everything else
1849          * Please try to follow the order.
1850          */
1851
1852         /* 1: Registers specific to a single generation */
1853         if (IS_VALLEYVIEW(i915))
1854                 gt->forcewake = intel_uncore_read_fw(uncore, FORCEWAKE_VLV);
1855
1856         if (GRAPHICS_VER(i915) == 7)
1857                 gt->err_int = intel_uncore_read(uncore, GEN7_ERR_INT);
1858
1859         if (GRAPHICS_VER_FULL(i915) >= IP_VER(12, 55)) {
1860                 gt->fault_data0 = intel_gt_mcr_read_any((struct intel_gt *)gt->_gt,
1861                                                         XEHP_FAULT_TLB_DATA0);
1862                 gt->fault_data1 = intel_gt_mcr_read_any((struct intel_gt *)gt->_gt,
1863                                                         XEHP_FAULT_TLB_DATA1);
1864         } else if (GRAPHICS_VER(i915) >= 12) {
1865                 gt->fault_data0 = intel_uncore_read(uncore,
1866                                                     GEN12_FAULT_TLB_DATA0);
1867                 gt->fault_data1 = intel_uncore_read(uncore,
1868                                                     GEN12_FAULT_TLB_DATA1);
1869         } else if (GRAPHICS_VER(i915) >= 8) {
1870                 gt->fault_data0 = intel_uncore_read(uncore,
1871                                                     GEN8_FAULT_TLB_DATA0);
1872                 gt->fault_data1 = intel_uncore_read(uncore,
1873                                                     GEN8_FAULT_TLB_DATA1);
1874         }
1875
1876         if (GRAPHICS_VER(i915) == 6) {
1877                 gt->forcewake = intel_uncore_read_fw(uncore, FORCEWAKE);
1878                 gt->gab_ctl = intel_uncore_read(uncore, GAB_CTL);
1879                 gt->gfx_mode = intel_uncore_read(uncore, GFX_MODE);
1880         }
1881
1882         /* 2: Registers which belong to multiple generations */
1883         if (GRAPHICS_VER(i915) >= 7)
1884                 gt->forcewake = intel_uncore_read_fw(uncore, FORCEWAKE_MT);
1885
1886         if (GRAPHICS_VER(i915) >= 6) {
1887                 if (GRAPHICS_VER(i915) < 12) {
1888                         gt->error = intel_uncore_read(uncore, ERROR_GEN6);
1889                         gt->done_reg = intel_uncore_read(uncore, DONE_REG);
1890                 }
1891         }
1892
1893         /* 3: Feature specific registers */
1894         if (IS_GRAPHICS_VER(i915, 6, 7)) {
1895                 gt->gam_ecochk = intel_uncore_read(uncore, GAM_ECOCHK);
1896                 gt->gac_eco = intel_uncore_read(uncore, GAC_ECO_BITS);
1897         }
1898
1899         if (IS_GRAPHICS_VER(i915, 8, 11))
1900                 gt->gtt_cache = intel_uncore_read(uncore, HSW_GTT_CACHE_EN);
1901
1902         if (GRAPHICS_VER(i915) == 12)
1903                 gt->aux_err = intel_uncore_read(uncore, GEN12_AUX_ERR_DBG);
1904
1905         if (GRAPHICS_VER(i915) >= 12) {
1906                 for (i = 0; i < I915_MAX_SFC; i++) {
1907                         /*
1908                          * SFC_DONE resides in the VD forcewake domain, so it
1909                          * only exists if the corresponding VCS engine is
1910                          * present.
1911                          */
1912                         if ((gt->_gt->info.sfc_mask & BIT(i)) == 0 ||
1913                             !HAS_ENGINE(gt->_gt, _VCS(i * 2)))
1914                                 continue;
1915
1916                         gt->sfc_done[i] =
1917                                 intel_uncore_read(uncore, GEN12_SFC_DONE(i));
1918                 }
1919
1920                 gt->gam_done = intel_uncore_read(uncore, GEN12_GAM_DONE);
1921         }
1922 }
1923
1924 static void gt_record_info(struct intel_gt_coredump *gt)
1925 {
1926         memcpy(&gt->info, &gt->_gt->info, sizeof(struct intel_gt_info));
1927         gt->clock_frequency = gt->_gt->clock_frequency;
1928         gt->clock_period_ns = gt->_gt->clock_period_ns;
1929 }
1930
1931 /*
1932  * Generate a semi-unique error code. The code is not meant to have meaning, The
1933  * code's only purpose is to try to prevent false duplicated bug reports by
1934  * grossly estimating a GPU error state.
1935  *
1936  * TODO Ideally, hashing the batchbuffer would be a very nice way to determine
1937  * the hang if we could strip the GTT offset information from it.
1938  *
1939  * It's only a small step better than a random number in its current form.
1940  */
1941 static u32 generate_ecode(const struct intel_engine_coredump *ee)
1942 {
1943         /*
1944          * IPEHR would be an ideal way to detect errors, as it's the gross
1945          * measure of "the command that hung." However, has some very common
1946          * synchronization commands which almost always appear in the case
1947          * strictly a client bug. Use instdone to differentiate those some.
1948          */
1949         return ee ? ee->ipehr ^ ee->instdone.instdone : 0;
1950 }
1951
1952 static const char *error_msg(struct i915_gpu_coredump *error)
1953 {
1954         struct intel_engine_coredump *first = NULL;
1955         unsigned int hung_classes = 0;
1956         struct intel_gt_coredump *gt;
1957         int len;
1958
1959         for (gt = error->gt; gt; gt = gt->next) {
1960                 struct intel_engine_coredump *cs;
1961
1962                 for (cs = gt->engine; cs; cs = cs->next) {
1963                         if (cs->hung) {
1964                                 hung_classes |= BIT(cs->engine->uabi_class);
1965                                 if (!first)
1966                                         first = cs;
1967                         }
1968                 }
1969         }
1970
1971         len = scnprintf(error->error_msg, sizeof(error->error_msg),
1972                         "GPU HANG: ecode %d:%x:%08x",
1973                         GRAPHICS_VER(error->i915), hung_classes,
1974                         generate_ecode(first));
1975         if (first && first->context.pid) {
1976                 /* Just show the first executing process, more is confusing */
1977                 len += scnprintf(error->error_msg + len,
1978                                  sizeof(error->error_msg) - len,
1979                                  ", in %s [%d]",
1980                                  first->context.comm, first->context.pid);
1981         }
1982
1983         return error->error_msg;
1984 }
1985
1986 static void capture_gen(struct i915_gpu_coredump *error)
1987 {
1988         struct drm_i915_private *i915 = error->i915;
1989
1990         error->wakelock = atomic_read(&i915->runtime_pm.wakeref_count);
1991         error->suspended = pm_runtime_suspended(i915->drm.dev);
1992
1993         error->iommu = i915_vtd_active(i915);
1994         error->reset_count = i915_reset_count(&i915->gpu_error);
1995         error->suspend_count = i915->suspend_count;
1996
1997         i915_params_copy(&error->params, &i915->params);
1998         memcpy(&error->device_info,
1999                INTEL_INFO(i915),
2000                sizeof(error->device_info));
2001         memcpy(&error->runtime_info,
2002                RUNTIME_INFO(i915),
2003                sizeof(error->runtime_info));
2004         error->driver_caps = i915->caps;
2005 }
2006
2007 struct i915_gpu_coredump *
2008 i915_gpu_coredump_alloc(struct drm_i915_private *i915, gfp_t gfp)
2009 {
2010         struct i915_gpu_coredump *error;
2011
2012         if (!i915->params.error_capture)
2013                 return NULL;
2014
2015         error = kzalloc(sizeof(*error), gfp);
2016         if (!error)
2017                 return NULL;
2018
2019         kref_init(&error->ref);
2020         error->i915 = i915;
2021
2022         error->time = ktime_get_real();
2023         error->boottime = ktime_get_boottime();
2024         error->uptime = ktime_sub(ktime_get(), to_gt(i915)->last_init_time);
2025         error->capture = jiffies;
2026
2027         capture_gen(error);
2028
2029         return error;
2030 }
2031
2032 #define DAY_AS_SECONDS(x) (24 * 60 * 60 * (x))
2033
2034 struct intel_gt_coredump *
2035 intel_gt_coredump_alloc(struct intel_gt *gt, gfp_t gfp, u32 dump_flags)
2036 {
2037         struct intel_gt_coredump *gc;
2038
2039         gc = kzalloc(sizeof(*gc), gfp);
2040         if (!gc)
2041                 return NULL;
2042
2043         gc->_gt = gt;
2044         gc->awake = intel_gt_pm_is_awake(gt);
2045
2046         gt_record_display_regs(gc);
2047         gt_record_global_nonguc_regs(gc);
2048
2049         /*
2050          * GuC dumps global, eng-class and eng-instance registers
2051          * (that can change as part of engine state during execution)
2052          * before an engine is reset due to a hung context.
2053          * GuC captures and reports all three groups of registers
2054          * together as a single set before the engine is reset.
2055          * Thus, if GuC triggered the context reset we retrieve
2056          * the register values as part of gt_record_engines.
2057          */
2058         if (!(dump_flags & CORE_DUMP_FLAG_IS_GUC_CAPTURE))
2059                 gt_record_global_regs(gc);
2060
2061         gt_record_fences(gc);
2062
2063         return gc;
2064 }
2065
2066 struct i915_vma_compress *
2067 i915_vma_capture_prepare(struct intel_gt_coredump *gt)
2068 {
2069         struct i915_vma_compress *compress;
2070
2071         compress = kmalloc(sizeof(*compress), ALLOW_FAIL);
2072         if (!compress)
2073                 return NULL;
2074
2075         if (!compress_init(compress)) {
2076                 kfree(compress);
2077                 return NULL;
2078         }
2079
2080         return compress;
2081 }
2082
2083 void i915_vma_capture_finish(struct intel_gt_coredump *gt,
2084                              struct i915_vma_compress *compress)
2085 {
2086         if (!compress)
2087                 return;
2088
2089         compress_fini(compress);
2090         kfree(compress);
2091 }
2092
2093 static struct i915_gpu_coredump *
2094 __i915_gpu_coredump(struct intel_gt *gt, intel_engine_mask_t engine_mask, u32 dump_flags)
2095 {
2096         struct drm_i915_private *i915 = gt->i915;
2097         struct intel_display *display = &i915->display;
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->display_snapshot = intel_display_snapshot_capture(display);
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 }