drivers/gpu/drm/i915/i915_gpu_error.c

   1 /*
   2  * Copyright (c) 2008 Intel Corporation
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice (including the next
  12  * paragraph) shall be included in all copies or substantial portions of the
  13  * Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  21  * IN THE SOFTWARE.
  22  *
  23  * Authors:
  24  *    Eric Anholt <eric@anholt.net>
  25  *    Keith Packard <keithp@keithp.com>
  26  *    Mika Kuoppala <mika.kuoppala@intel.com>
  27  *
  28  */
  29
  30 #include <linux/ascii85.h>
  31 #include <linux/nmi.h>
  32 #include <linux/pagevec.h>
  33 #include <linux/scatterlist.h>
  34 #include <linux/utsname.h>
  35 #include <linux/zlib.h>
  36
  37 #include <drm/drm_print.h>
  38
  39 #include "display/intel_atomic.h"
  40 #include "display/intel_csr.h"
  41 #include "display/intel_overlay.h"
  42
  43 #include "gem/i915_gem_context.h"
  44 #include "gem/i915_gem_lmem.h"
  45 #include "gt/intel_gt.h"
  46 #include "gt/intel_gt_pm.h"
  47
  48 #include "i915_drv.h"
  49 #include "i915_gpu_error.h"
  50 #include "i915_memcpy.h"
  51 #include "i915_scatterlist.h"
  52
  53 #define ALLOW_FAIL (GFP_KERNEL | __GFP_RETRY_MAYFAIL | __GFP_NOWARN)
  54 #define ATOMIC_MAYFAIL (GFP_ATOMIC | __GFP_NOWARN)
  55
  56 static void __sg_set_buf(struct scatterlist *sg,
  57                          void *addr, unsigned int len, loff_t it)
  58 {
  59         sg->page_link = (unsigned long)virt_to_page(addr);
  60         sg->offset = offset_in_page(addr);
  61         sg->length = len;
  62         sg->dma_address = it;
  63 }
  64
  65 static bool __i915_error_grow(struct drm_i915_error_state_buf *e, size_t len)
  66 {
  67         if (!len)
  68                 return false;
  69
  70         if (e->bytes + len + 1 <= e->size)
  71                 return true;
  72
  73         if (e->bytes) {
  74                 __sg_set_buf(e->cur++, e->buf, e->bytes, e->iter);
  75                 e->iter += e->bytes;
  76                 e->buf = NULL;
  77                 e->bytes = 0;
  78         }
  79
  80         if (e->cur == e->end) {
  81                 struct scatterlist *sgl;
  82
  83                 sgl = (typeof(sgl))__get_free_page(ALLOW_FAIL);
  84                 if (!sgl) {
  85                         e->err = -ENOMEM;
  86                         return false;
  87                 }
  88
  89                 if (e->cur) {
  90                         e->cur->offset = 0;
  91                         e->cur->length = 0;
  92                         e->cur->page_link =
  93                                 (unsigned long)sgl | SG_CHAIN;
  94                 } else {
  95                         e->sgl = sgl;
  96                 }
  97
  98                 e->cur = sgl;
  99                 e->end = sgl + SG_MAX_SINGLE_ALLOC - 1;
 100         }
 101
 102         e->size = ALIGN(len + 1, SZ_64K);
 103         e->buf = kmalloc(e->size, ALLOW_FAIL);
 104         if (!e->buf) {
 105                 e->size = PAGE_ALIGN(len + 1);
 106                 e->buf = kmalloc(e->size, GFP_KERNEL);
 107         }
 108         if (!e->buf) {
 109                 e->err = -ENOMEM;
 110                 return false;
 111         }
 112
 113         return true;
 114 }
 115
 116 __printf(2, 0)
 117 static void i915_error_vprintf(struct drm_i915_error_state_buf *e,
 118                                const char *fmt, va_list args)
 119 {
 120         va_list ap;
 121         int len;
 122
 123         if (e->err)
 124                 return;
 125
 126         va_copy(ap, args);
 127         len = vsnprintf(NULL, 0, fmt, ap);
 128         va_end(ap);
 129         if (len <= 0) {
 130                 e->err = len;
 131                 return;
 132         }
 133
 134         if (!__i915_error_grow(e, len))
 135                 return;
 136
 137         GEM_BUG_ON(e->bytes >= e->size);
 138         len = vscnprintf(e->buf + e->bytes, e->size - e->bytes, fmt, args);
 139         if (len < 0) {
 140                 e->err = len;
 141                 return;
 142         }
 143         e->bytes += len;
 144 }
 145
 146 static void i915_error_puts(struct drm_i915_error_state_buf *e, const char *str)
 147 {
 148         unsigned len;
 149
 150         if (e->err || !str)
 151                 return;
 152
 153         len = strlen(str);
 154         if (!__i915_error_grow(e, len))
 155                 return;
 156
 157         GEM_BUG_ON(e->bytes + len > e->size);
 158         memcpy(e->buf + e->bytes, str, len);
 159         e->bytes += len;
 160 }
 161
 162 #define err_printf(e, ...) i915_error_printf(e, __VA_ARGS__)
 163 #define err_puts(e, s) i915_error_puts(e, s)
 164
 165 static void __i915_printfn_error(struct drm_printer *p, struct va_format *vaf)
 166 {
 167         i915_error_vprintf(p->arg, vaf->fmt, *vaf->va);
 168 }
 169
 170 static inline struct drm_printer
 171 i915_error_printer(struct drm_i915_error_state_buf *e)
 172 {
 173         struct drm_printer p = {
 174                 .printfn = __i915_printfn_error,
 175                 .arg = e,
 176         };
 177         return p;
 178 }
 179
 180 /* single threaded page allocator with a reserved stash for emergencies */
 181 static void pool_fini(struct pagevec *pv)
 182 {
 183         pagevec_release(pv);
 184 }
 185
 186 static int pool_refill(struct pagevec *pv, gfp_t gfp)
 187 {
 188         while (pagevec_space(pv)) {
 189                 struct page *p;
 190
 191                 p = alloc_page(gfp);
 192                 if (!p)
 193                         return -ENOMEM;
 194
 195                 pagevec_add(pv, p);
 196         }
 197
 198         return 0;
 199 }
 200
 201 static int pool_init(struct pagevec *pv, gfp_t gfp)
 202 {
 203         int err;
 204
 205         pagevec_init(pv);
 206
 207         err = pool_refill(pv, gfp);
 208         if (err)
 209                 pool_fini(pv);
 210
 211         return err;
 212 }
 213
 214 static void *pool_alloc(struct pagevec *pv, gfp_t gfp)
 215 {
 216         struct page *p;
 217
 218         p = alloc_page(gfp);
 219         if (!p && pagevec_count(pv))
 220                 p = pv->pages[--pv->nr];
 221
 222         return p ? page_address(p) : NULL;
 223 }
 224
 225 static void pool_free(struct pagevec *pv, void *addr)
 226 {
 227         struct page *p = virt_to_page(addr);
 228
 229         if (pagevec_space(pv))
 230                 pagevec_add(pv, p);
 231         else
 232                 __free_page(p);
 233 }
 234
 235 #ifdef CONFIG_DRM_I915_COMPRESS_ERROR
 236
 237 struct i915_vma_compress {
 238         struct pagevec pool;
 239         struct z_stream_s zstream;
 240         void *tmp;
 241 };
 242
 243 static bool compress_init(struct i915_vma_compress *c)
 244 {
 245         struct z_stream_s *zstream = &c->zstream;
 246
 247         if (pool_init(&c->pool, ALLOW_FAIL))
 248                 return false;
 249
 250         zstream->workspace =
 251                 kmalloc(zlib_deflate_workspacesize(MAX_WBITS, MAX_MEM_LEVEL),
 252                         ALLOW_FAIL);
 253         if (!zstream->workspace) {
 254                 pool_fini(&c->pool);
 255                 return false;
 256         }
 257
 258         c->tmp = NULL;
 259         if (i915_has_memcpy_from_wc())
 260                 c->tmp = pool_alloc(&c->pool, ALLOW_FAIL);
 261
 262         return true;
 263 }
 264
 265 static bool compress_start(struct i915_vma_compress *c)
 266 {
 267         struct z_stream_s *zstream = &c->zstream;
 268         void *workspace = zstream->workspace;
 269
 270         memset(zstream, 0, sizeof(*zstream));
 271         zstream->workspace = workspace;
 272
 273         return zlib_deflateInit(zstream, Z_DEFAULT_COMPRESSION) == Z_OK;
 274 }
 275
 276 static void *compress_next_page(struct i915_vma_compress *c,
 277                                 struct i915_vma_coredump *dst)
 278 {
 279         void *page;
 280
 281         if (dst->page_count >= dst->num_pages)
 282                 return ERR_PTR(-ENOSPC);
 283
 284         page = pool_alloc(&c->pool, ALLOW_FAIL);
 285         if (!page)
 286                 return ERR_PTR(-ENOMEM);
 287
 288         return dst->pages[dst->page_count++] = page;
 289 }
 290
 291 static int compress_page(struct i915_vma_compress *c,
 292                          void *src,
 293                          struct i915_vma_coredump *dst,
 294                          bool wc)
 295 {
 296         struct z_stream_s *zstream = &c->zstream;
 297
 298         zstream->next_in = src;
 299         if (wc && c->tmp && i915_memcpy_from_wc(c->tmp, src, PAGE_SIZE))
 300                 zstream->next_in = c->tmp;
 301         zstream->avail_in = PAGE_SIZE;
 302
 303         do {
 304                 if (zstream->avail_out == 0) {
 305                         zstream->next_out = compress_next_page(c, dst);
 306                         if (IS_ERR(zstream->next_out))
 307                                 return PTR_ERR(zstream->next_out);
 308
 309                         zstream->avail_out = PAGE_SIZE;
 310                 }
 311
 312                 if (zlib_deflate(zstream, Z_NO_FLUSH) != Z_OK)
 313                         return -EIO;
 314
 315                 cond_resched();
 316         } while (zstream->avail_in);
 317
 318         /* Fallback to uncompressed if we increase size? */
 319         if (0 && zstream->total_out > zstream->total_in)
 320                 return -E2BIG;
 321
 322         return 0;
 323 }
 324
 325 static int compress_flush(struct i915_vma_compress *c,
 326                           struct i915_vma_coredump *dst)
 327 {
 328         struct z_stream_s *zstream = &c->zstream;
 329
 330         do {
 331                 switch (zlib_deflate(zstream, Z_FINISH)) {
 332                 case Z_OK: /* more space requested */
 333                         zstream->next_out = compress_next_page(c, dst);
 334                         if (IS_ERR(zstream->next_out))
 335                                 return PTR_ERR(zstream->next_out);
 336
 337                         zstream->avail_out = PAGE_SIZE;
 338                         break;
 339
 340                 case Z_STREAM_END:
 341                         goto end;
 342
 343                 default: /* any error */
 344                         return -EIO;
 345                 }
 346         } while (1);
 347
 348 end:
 349         memset(zstream->next_out, 0, zstream->avail_out);
 350         dst->unused = zstream->avail_out;
 351         return 0;
 352 }
 353
 354 static void compress_finish(struct i915_vma_compress *c)
 355 {
 356         zlib_deflateEnd(&c->zstream);
 357 }
 358
 359 static void compress_fini(struct i915_vma_compress *c)
 360 {
 361         kfree(c->zstream.workspace);
 362         if (c->tmp)
 363                 pool_free(&c->pool, c->tmp);
 364         pool_fini(&c->pool);
 365 }
 366
 367 static void err_compression_marker(struct drm_i915_error_state_buf *m)
 368 {
 369         err_puts(m, ":");
 370 }
 371
 372 #else
 373
 374 struct i915_vma_compress {
 375         struct pagevec pool;
 376 };
 377
 378 static bool compress_init(struct i915_vma_compress *c)
 379 {
 380         return pool_init(&c->pool, ALLOW_FAIL) == 0;
 381 }
 382
 383 static bool compress_start(struct i915_vma_compress *c)
 384 {
 385         return true;
 386 }
 387
 388 static int compress_page(struct i915_vma_compress *c,
 389                          void *src,
 390                          struct i915_vma_coredump *dst,
 391                          bool wc)
 392 {
 393         void *ptr;
 394
 395         ptr = pool_alloc(&c->pool, ALLOW_FAIL);
 396         if (!ptr)
 397                 return -ENOMEM;
 398
 399         if (!(wc && i915_memcpy_from_wc(ptr, src, PAGE_SIZE)))
 400                 memcpy(ptr, src, PAGE_SIZE);
 401         dst->pages[dst->page_count++] = ptr;
 402         cond_resched();
 403
 404         return 0;
 405 }
 406
 407 static int compress_flush(struct i915_vma_compress *c,
 408                           struct i915_vma_coredump *dst)
 409 {
 410         return 0;
 411 }
 412
 413 static void compress_finish(struct i915_vma_compress *c)
 414 {
 415 }
 416
 417 static void compress_fini(struct i915_vma_compress *c)
 418 {
 419         pool_fini(&c->pool);
 420 }
 421
 422 static void err_compression_marker(struct drm_i915_error_state_buf *m)
 423 {
 424         err_puts(m, "~");
 425 }
 426
 427 #endif
 428
 429 static void error_print_instdone(struct drm_i915_error_state_buf *m,
 430                                  const struct intel_engine_coredump *ee)
 431 {
 432         const struct sseu_dev_info *sseu = &ee->engine->gt->info.sseu;
 433         int slice;
 434         int subslice;
 435
 436         err_printf(m, "  INSTDONE: 0x%08x\n",
 437                    ee->instdone.instdone);
 438
 439         if (ee->engine->class != RENDER_CLASS || INTEL_GEN(m->i915) <= 3)
 440                 return;
 441
 442         err_printf(m, "  SC_INSTDONE: 0x%08x\n",
 443                    ee->instdone.slice_common);
 444
 445         if (INTEL_GEN(m->i915) <= 6)
 446                 return;
 447
 448         for_each_instdone_slice_subslice(m->i915, sseu, slice, subslice)
 449                 err_printf(m, "  SAMPLER_INSTDONE[%d][%d]: 0x%08x\n",
 450                            slice, subslice,
 451                            ee->instdone.sampler[slice][subslice]);
 452
 453         for_each_instdone_slice_subslice(m->i915, sseu, slice, subslice)
 454                 err_printf(m, "  ROW_INSTDONE[%d][%d]: 0x%08x\n",
 455                            slice, subslice,
 456                            ee->instdone.row[slice][subslice]);
 457
 458         if (INTEL_GEN(m->i915) < 12)
 459                 return;
 460
 461         err_printf(m, "  SC_INSTDONE_EXTRA: 0x%08x\n",
 462                    ee->instdone.slice_common_extra[0]);
 463         err_printf(m, "  SC_INSTDONE_EXTRA2: 0x%08x\n",
 464                    ee->instdone.slice_common_extra[1]);
 465 }
 466
 467 static void error_print_request(struct drm_i915_error_state_buf *m,
 468                                 const char *prefix,
 469                                 const struct i915_request_coredump *erq)
 470 {
 471         if (!erq->seqno)
 472                 return;
 473
 474         err_printf(m, "%s pid %d, seqno %8x:%08x%s%s, prio %d, head %08x, tail %08x\n",
 475                    prefix, erq->pid, erq->context, erq->seqno,
 476                    test_bit(DMA_FENCE_FLAG_SIGNALED_BIT,
 477                             &erq->flags) ? "!" : "",
 478                    test_bit(DMA_FENCE_FLAG_ENABLE_SIGNAL_BIT,
 479                             &erq->flags) ? "+" : "",
 480                    erq->sched_attr.priority,
 481                    erq->head, erq->tail);
 482 }
 483
 484 static void error_print_context(struct drm_i915_error_state_buf *m,
 485                                 const char *header,
 486                                 const struct i915_gem_context_coredump *ctx)
 487 {
 488         const u32 period = m->i915->gt.clock_period_ns;
 489
 490         err_printf(m, "%s%s[%d] prio %d, guilty %d active %d, runtime total %lluns, avg %lluns\n",
 491                    header, ctx->comm, ctx->pid, ctx->sched_attr.priority,
 492                    ctx->guilty, ctx->active,
 493                    ctx->total_runtime * period,
 494                    mul_u32_u32(ctx->avg_runtime, period));
 495 }
 496
 497 static struct i915_vma_coredump *
 498 __find_vma(struct i915_vma_coredump *vma, const char *name)
 499 {
 500         while (vma) {
 501                 if (strcmp(vma->name, name) == 0)
 502                         return vma;
 503                 vma = vma->next;
 504         }
 505
 506         return NULL;
 507 }
 508
 509 static struct i915_vma_coredump *
 510 find_batch(const struct intel_engine_coredump *ee)
 511 {
 512         return __find_vma(ee->vma, "batch");
 513 }
 514
 515 static void error_print_engine(struct drm_i915_error_state_buf *m,
 516                                const struct intel_engine_coredump *ee)
 517 {
 518         struct i915_vma_coredump *batch;
 519         int n;
 520
 521         err_printf(m, "%s command stream:\n", ee->engine->name);
 522         err_printf(m, "  CCID:  0x%08x\n", ee->ccid);
 523         err_printf(m, "  START: 0x%08x\n", ee->start);
 524         err_printf(m, "  HEAD:  0x%08x [0x%08x]\n", ee->head, ee->rq_head);
 525         err_printf(m, "  TAIL:  0x%08x [0x%08x, 0x%08x]\n",
 526                    ee->tail, ee->rq_post, ee->rq_tail);
 527         err_printf(m, "  CTL:   0x%08x\n", ee->ctl);
 528         err_printf(m, "  MODE:  0x%08x\n", ee->mode);
 529         err_printf(m, "  HWS:   0x%08x\n", ee->hws);
 530         err_printf(m, "  ACTHD: 0x%08x %08x\n",
 531                    (u32)(ee->acthd>>32), (u32)ee->acthd);
 532         err_printf(m, "  IPEIR: 0x%08x\n", ee->ipeir);
 533         err_printf(m, "  IPEHR: 0x%08x\n", ee->ipehr);
 534         err_printf(m, "  ESR:   0x%08x\n", ee->esr);
 535
 536         error_print_instdone(m, ee);
 537
 538         batch = find_batch(ee);
 539         if (batch) {
 540                 u64 start = batch->gtt_offset;
 541                 u64 end = start + batch->gtt_size;
 542
 543                 err_printf(m, "  batch: [0x%08x_%08x, 0x%08x_%08x]\n",
 544                            upper_32_bits(start), lower_32_bits(start),
 545                            upper_32_bits(end), lower_32_bits(end));
 546         }
 547         if (INTEL_GEN(m->i915) >= 4) {
 548                 err_printf(m, "  BBADDR: 0x%08x_%08x\n",
 549                            (u32)(ee->bbaddr>>32), (u32)ee->bbaddr);
 550                 err_printf(m, "  BB_STATE: 0x%08x\n", ee->bbstate);
 551                 err_printf(m, "  INSTPS: 0x%08x\n", ee->instps);
 552         }
 553         err_printf(m, "  INSTPM: 0x%08x\n", ee->instpm);
 554         err_printf(m, "  FADDR: 0x%08x %08x\n", upper_32_bits(ee->faddr),
 555                    lower_32_bits(ee->faddr));
 556         if (INTEL_GEN(m->i915) >= 6) {
 557                 err_printf(m, "  RC PSMI: 0x%08x\n", ee->rc_psmi);
 558                 err_printf(m, "  FAULT_REG: 0x%08x\n", ee->fault_reg);
 559         }
 560         if (HAS_PPGTT(m->i915)) {
 561                 err_printf(m, "  GFX_MODE: 0x%08x\n", ee->vm_info.gfx_mode);
 562
 563                 if (INTEL_GEN(m->i915) >= 8) {
 564                         int i;
 565                         for (i = 0; i < 4; i++)
 566                                 err_printf(m, "  PDP%d: 0x%016llx\n",
 567                                            i, ee->vm_info.pdp[i]);
 568                 } else {
 569                         err_printf(m, "  PP_DIR_BASE: 0x%08x\n",
 570                                    ee->vm_info.pp_dir_base);
 571                 }
 572         }
 573         err_printf(m, "  hung: %u\n", ee->hung);
 574         err_printf(m, "  engine reset count: %u\n", ee->reset_count);
 575
 576         for (n = 0; n < ee->num_ports; n++) {
 577                 err_printf(m, "  ELSP[%d]:", n);
 578                 error_print_request(m, " ", &ee->execlist[n]);
 579         }
 580
 581         error_print_context(m, "  Active context: ", &ee->context);
 582 }
 583
 584 void i915_error_printf(struct drm_i915_error_state_buf *e, const char *f, ...)
 585 {
 586         va_list args;
 587
 588         va_start(args, f);
 589         i915_error_vprintf(e, f, args);
 590         va_end(args);
 591 }
 592
 593 static void print_error_vma(struct drm_i915_error_state_buf *m,
 594                             const struct intel_engine_cs *engine,
 595                             const struct i915_vma_coredump *vma)
 596 {
 597         char out[ASCII85_BUFSZ];
 598         int page;
 599
 600         if (!vma)
 601                 return;
 602
 603         err_printf(m, "%s --- %s = 0x%08x %08x\n",
 604                    engine ? engine->name : "global", vma->name,
 605                    upper_32_bits(vma->gtt_offset),
 606                    lower_32_bits(vma->gtt_offset));
 607
 608         if (vma->gtt_page_sizes > I915_GTT_PAGE_SIZE_4K)
 609                 err_printf(m, "gtt_page_sizes = 0x%08x\n", vma->gtt_page_sizes);
 610
 611         err_compression_marker(m);
 612         for (page = 0; page < vma->page_count; page++) {
 613                 int i, len;
 614
 615                 len = PAGE_SIZE;
 616                 if (page == vma->page_count - 1)
 617                         len -= vma->unused;
 618                 len = ascii85_encode_len(len);
 619
 620                 for (i = 0; i < len; i++)
 621                         err_puts(m, ascii85_encode(vma->pages[page][i], out));
 622         }
 623         err_puts(m, "\n");
 624 }
 625
 626 static void err_print_capabilities(struct drm_i915_error_state_buf *m,
 627                                    struct i915_gpu_coredump *error)
 628 {
 629         struct drm_printer p = i915_error_printer(m);
 630
 631         intel_device_info_print_static(&error->device_info, &p);
 632         intel_device_info_print_runtime(&error->runtime_info, &p);
 633         intel_driver_caps_print(&error->driver_caps, &p);
 634 }
 635
 636 static void err_print_params(struct drm_i915_error_state_buf *m,
 637                              const struct i915_params *params)
 638 {
 639         struct drm_printer p = i915_error_printer(m);
 640
 641         i915_params_dump(params, &p);
 642 }
 643
 644 static void err_print_pciid(struct drm_i915_error_state_buf *m,
 645                             struct drm_i915_private *i915)
 646 {
 647         struct pci_dev *pdev = to_pci_dev(i915->drm.dev);
 648
 649         err_printf(m, "PCI ID: 0x%04x\n", pdev->device);
 650         err_printf(m, "PCI Revision: 0x%02x\n", pdev->revision);
 651         err_printf(m, "PCI Subsystem: %04x:%04x\n",
 652                    pdev->subsystem_vendor,
 653                    pdev->subsystem_device);
 654 }
 655
 656 static void err_print_uc(struct drm_i915_error_state_buf *m,
 657                          const struct intel_uc_coredump *error_uc)
 658 {
 659         struct drm_printer p = i915_error_printer(m);
 660
 661         intel_uc_fw_dump(&error_uc->guc_fw, &p);
 662         intel_uc_fw_dump(&error_uc->huc_fw, &p);
 663         print_error_vma(m, NULL, error_uc->guc_log);
 664 }
 665
 666 static void err_free_sgl(struct scatterlist *sgl)
 667 {
 668         while (sgl) {
 669                 struct scatterlist *sg;
 670
 671                 for (sg = sgl; !sg_is_chain(sg); sg++) {
 672                         kfree(sg_virt(sg));
 673                         if (sg_is_last(sg))
 674                                 break;
 675                 }
 676
 677                 sg = sg_is_last(sg) ? NULL : sg_chain_ptr(sg);
 678                 free_page((unsigned long)sgl);
 679                 sgl = sg;
 680         }
 681 }
 682
 683 static void err_print_gt_info(struct drm_i915_error_state_buf *m,
 684                               struct intel_gt_coredump *gt)
 685 {
 686         struct drm_printer p = i915_error_printer(m);
 687
 688         intel_gt_info_print(&gt->info, &p);
 689         intel_sseu_print_topology(&gt->info.sseu, &p);
 690 }
 691
 692 static void err_print_gt(struct drm_i915_error_state_buf *m,
 693                          struct intel_gt_coredump *gt)
 694 {
 695         const struct intel_engine_coredump *ee;
 696         int i;
 697
 698         err_printf(m, "GT awake: %s\n", yesno(gt->awake));
 699         err_printf(m, "EIR: 0x%08x\n", gt->eir);
 700         err_printf(m, "IER: 0x%08x\n", gt->ier);
 701         for (i = 0; i < gt->ngtier; i++)
 702                 err_printf(m, "GTIER[%d]: 0x%08x\n", i, gt->gtier[i]);
 703         err_printf(m, "PGTBL_ER: 0x%08x\n", gt->pgtbl_er);
 704         err_printf(m, "FORCEWAKE: 0x%08x\n", gt->forcewake);
 705         err_printf(m, "DERRMR: 0x%08x\n", gt->derrmr);
 706
 707         for (i = 0; i < gt->nfence; i++)
 708                 err_printf(m, "  fence[%d] = %08llx\n", i, gt->fence[i]);
 709
 710         if (IS_GEN_RANGE(m->i915, 6, 11)) {
 711                 err_printf(m, "ERROR: 0x%08x\n", gt->error);
 712                 err_printf(m, "DONE_REG: 0x%08x\n", gt->done_reg);
 713         }
 714
 715         if (INTEL_GEN(m->i915) >= 8)
 716                 err_printf(m, "FAULT_TLB_DATA: 0x%08x 0x%08x\n",
 717                            gt->fault_data1, gt->fault_data0);
 718
 719         if (IS_GEN(m->i915, 7))
 720                 err_printf(m, "ERR_INT: 0x%08x\n", gt->err_int);
 721
 722         if (IS_GEN_RANGE(m->i915, 8, 11))
 723                 err_printf(m, "GTT_CACHE_EN: 0x%08x\n", gt->gtt_cache);
 724
 725         if (IS_GEN(m->i915, 12))
 726                 err_printf(m, "AUX_ERR_DBG: 0x%08x\n", gt->aux_err);
 727
 728         if (INTEL_GEN(m->i915) >= 12) {
 729                 int i;
 730
 731                 for (i = 0; i < GEN12_SFC_DONE_MAX; i++)
 732                         err_printf(m, "  SFC_DONE[%d]: 0x%08x\n", i,
 733                                    gt->sfc_done[i]);
 734
 735                 err_printf(m, "  GAM_DONE: 0x%08x\n", gt->gam_done);
 736         }
 737
 738         for (ee = gt->engine; ee; ee = ee->next) {
 739                 const struct i915_vma_coredump *vma;
 740
 741                 error_print_engine(m, ee);
 742                 for (vma = ee->vma; vma; vma = vma->next)
 743                         print_error_vma(m, ee->engine, vma);
 744         }
 745
 746         if (gt->uc)
 747                 err_print_uc(m, gt->uc);
 748
 749         err_print_gt_info(m, gt);
 750 }
 751
 752 static void __err_print_to_sgl(struct drm_i915_error_state_buf *m,
 753                                struct i915_gpu_coredump *error)
 754 {
 755         const struct intel_engine_coredump *ee;
 756         struct timespec64 ts;
 757
 758         if (*error->error_msg)
 759                 err_printf(m, "%s\n", error->error_msg);
 760         err_printf(m, "Kernel: %s %s\n",
 761                    init_utsname()->release,
 762                    init_utsname()->machine);
 763         err_printf(m, "Driver: %s\n", DRIVER_DATE);
 764         ts = ktime_to_timespec64(error->time);
 765         err_printf(m, "Time: %lld s %ld us\n",
 766                    (s64)ts.tv_sec, ts.tv_nsec / NSEC_PER_USEC);
 767         ts = ktime_to_timespec64(error->boottime);
 768         err_printf(m, "Boottime: %lld s %ld us\n",
 769                    (s64)ts.tv_sec, ts.tv_nsec / NSEC_PER_USEC);
 770         ts = ktime_to_timespec64(error->uptime);
 771         err_printf(m, "Uptime: %lld s %ld us\n",
 772                    (s64)ts.tv_sec, ts.tv_nsec / NSEC_PER_USEC);
 773         err_printf(m, "Capture: %lu jiffies; %d ms ago\n",
 774                    error->capture, jiffies_to_msecs(jiffies - error->capture));
 775
 776         for (ee = error->gt ? error->gt->engine : NULL; ee; ee = ee->next)
 777                 err_printf(m, "Active process (on ring %s): %s [%d]\n",
 778                            ee->engine->name,
 779                            ee->context.comm,
 780                            ee->context.pid);
 781
 782         err_printf(m, "Reset count: %u\n", error->reset_count);
 783         err_printf(m, "Suspend count: %u\n", error->suspend_count);
 784         err_printf(m, "Platform: %s\n", intel_platform_name(error->device_info.platform));
 785         err_printf(m, "Subplatform: 0x%x\n",
 786                    intel_subplatform(&error->runtime_info,
 787                                      error->device_info.platform));
 788         err_print_pciid(m, m->i915);
 789
 790         err_printf(m, "IOMMU enabled?: %d\n", error->iommu);
 791
 792         if (HAS_CSR(m->i915)) {
 793                 struct intel_csr *csr = &m->i915->csr;
 794
 795                 err_printf(m, "DMC loaded: %s\n",
 796                            yesno(csr->dmc_payload != NULL));
 797                 err_printf(m, "DMC fw version: %d.%d\n",
 798                            CSR_VERSION_MAJOR(csr->version),
 799                            CSR_VERSION_MINOR(csr->version));
 800         }
 801
 802         err_printf(m, "RPM wakelock: %s\n", yesno(error->wakelock));
 803         err_printf(m, "PM suspended: %s\n", yesno(error->suspended));
 804
 805         if (error->gt)
 806                 err_print_gt(m, error->gt);
 807
 808         if (error->overlay)
 809                 intel_overlay_print_error_state(m, error->overlay);
 810
 811         if (error->display)
 812                 intel_display_print_error_state(m, error->display);
 813
 814         err_print_capabilities(m, error);
 815         err_print_params(m, &error->params);
 816 }
 817
 818 static int err_print_to_sgl(struct i915_gpu_coredump *error)
 819 {
 820         struct drm_i915_error_state_buf m;
 821
 822         if (IS_ERR(error))
 823                 return PTR_ERR(error);
 824
 825         if (READ_ONCE(error->sgl))
 826                 return 0;
 827
 828         memset(&m, 0, sizeof(m));
 829         m.i915 = error->i915;
 830
 831         __err_print_to_sgl(&m, error);
 832
 833         if (m.buf) {
 834                 __sg_set_buf(m.cur++, m.buf, m.bytes, m.iter);
 835                 m.bytes = 0;
 836                 m.buf = NULL;
 837         }
 838         if (m.cur) {
 839                 GEM_BUG_ON(m.end < m.cur);
 840                 sg_mark_end(m.cur - 1);
 841         }
 842         GEM_BUG_ON(m.sgl && !m.cur);
 843
 844         if (m.err) {
 845                 err_free_sgl(m.sgl);
 846                 return m.err;
 847         }
 848
 849         if (cmpxchg(&error->sgl, NULL, m.sgl))
 850                 err_free_sgl(m.sgl);
 851
 852         return 0;
 853 }
 854
 855 ssize_t i915_gpu_coredump_copy_to_buffer(struct i915_gpu_coredump *error,
 856                                          char *buf, loff_t off, size_t rem)
 857 {
 858         struct scatterlist *sg;
 859         size_t count;
 860         loff_t pos;
 861         int err;
 862
 863         if (!error || !rem)
 864                 return 0;
 865
 866         err = err_print_to_sgl(error);
 867         if (err)
 868                 return err;
 869
 870         sg = READ_ONCE(error->fit);
 871         if (!sg || off < sg->dma_address)
 872                 sg = error->sgl;
 873         if (!sg)
 874                 return 0;
 875
 876         pos = sg->dma_address;
 877         count = 0;
 878         do {
 879                 size_t len, start;
 880
 881                 if (sg_is_chain(sg)) {
 882                         sg = sg_chain_ptr(sg);
 883                         GEM_BUG_ON(sg_is_chain(sg));
 884                 }
 885
 886                 len = sg->length;
 887                 if (pos + len <= off) {
 888                         pos += len;
 889                         continue;
 890                 }
 891
 892                 start = sg->offset;
 893                 if (pos < off) {
 894                         GEM_BUG_ON(off - pos > len);
 895                         len -= off - pos;
 896                         start += off - pos;
 897                         pos = off;
 898                 }
 899
 900                 len = min(len, rem);
 901                 GEM_BUG_ON(!len || len > sg->length);
 902
 903                 memcpy(buf, page_address(sg_page(sg)) + start, len);
 904
 905                 count += len;
 906                 pos += len;
 907
 908                 buf += len;
 909                 rem -= len;
 910                 if (!rem) {
 911                         WRITE_ONCE(error->fit, sg);
 912                         break;
 913                 }
 914         } while (!sg_is_last(sg++));
 915
 916         return count;
 917 }
 918
 919 static void i915_vma_coredump_free(struct i915_vma_coredump *vma)
 920 {
 921         while (vma) {
 922                 struct i915_vma_coredump *next = vma->next;
 923                 int page;
 924
 925                 for (page = 0; page < vma->page_count; page++)
 926                         free_page((unsigned long)vma->pages[page]);
 927
 928                 kfree(vma);
 929                 vma = next;
 930         }
 931 }
 932
 933 static void cleanup_params(struct i915_gpu_coredump *error)
 934 {
 935         i915_params_free(&error->params);
 936 }
 937
 938 static void cleanup_uc(struct intel_uc_coredump *uc)
 939 {
 940         kfree(uc->guc_fw.path);
 941         kfree(uc->huc_fw.path);
 942         i915_vma_coredump_free(uc->guc_log);
 943
 944         kfree(uc);
 945 }
 946
 947 static void cleanup_gt(struct intel_gt_coredump *gt)
 948 {
 949         while (gt->engine) {
 950                 struct intel_engine_coredump *ee = gt->engine;
 951
 952                 gt->engine = ee->next;
 953
 954                 i915_vma_coredump_free(ee->vma);
 955                 kfree(ee);
 956         }
 957
 958         if (gt->uc)
 959                 cleanup_uc(gt->uc);
 960
 961         kfree(gt);
 962 }
 963
 964 void __i915_gpu_coredump_free(struct kref *error_ref)
 965 {
 966         struct i915_gpu_coredump *error =
 967                 container_of(error_ref, typeof(*error), ref);
 968
 969         while (error->gt) {
 970                 struct intel_gt_coredump *gt = error->gt;
 971
 972                 error->gt = gt->next;
 973                 cleanup_gt(gt);
 974         }
 975
 976         kfree(error->overlay);
 977         kfree(error->display);
 978
 979         cleanup_params(error);
 980
 981         err_free_sgl(error->sgl);
 982         kfree(error);
 983 }
 984
 985 static struct i915_vma_coredump *
 986 i915_vma_coredump_create(const struct intel_gt *gt,
 987                          const struct i915_vma *vma,
 988                          const char *name,
 989                          struct i915_vma_compress *compress)
 990 {
 991         struct i915_ggtt *ggtt = gt->ggtt;
 992         const u64 slot = ggtt->error_capture.start;
 993         struct i915_vma_coredump *dst;
 994         unsigned long num_pages;
 995         struct sgt_iter iter;
 996         int ret;
 997
 998         might_sleep();
 999
1000         if (!vma || !vma->pages || !compress)
1001                 return NULL;
1002
1003         num_pages = min_t(u64, vma->size, vma->obj->base.size) >> PAGE_SHIFT;
1004         num_pages = DIV_ROUND_UP(10 * num_pages, 8); /* worstcase zlib growth */
1005         dst = kmalloc(sizeof(*dst) + num_pages * sizeof(u32 *), ALLOW_FAIL);
1006         if (!dst)
1007                 return NULL;
1008
1009         if (!compress_start(compress)) {
1010                 kfree(dst);
1011                 return NULL;
1012         }
1013
1014         strcpy(dst->name, name);
1015         dst->next = NULL;
1016
1017         dst->gtt_offset = vma->node.start;
1018         dst->gtt_size = vma->node.size;
1019         dst->gtt_page_sizes = vma->page_sizes.gtt;
1020         dst->num_pages = num_pages;
1021         dst->page_count = 0;
1022         dst->unused = 0;
1023
1024         ret = -EINVAL;
1025         if (drm_mm_node_allocated(&ggtt->error_capture)) {
1026                 void __iomem *s;
1027                 dma_addr_t dma;
1028
1029                 for_each_sgt_daddr(dma, iter, vma->pages) {
1030                         mutex_lock(&ggtt->error_mutex);
1031                         ggtt->vm.insert_page(&ggtt->vm, dma, slot,
1032                                              I915_CACHE_NONE, 0);
1033                         mb();
1034
1035                         s = io_mapping_map_wc(&ggtt->iomap, slot, PAGE_SIZE);
1036                         ret = compress_page(compress,
1037                                             (void  __force *)s, dst,
1038                                             true);
1039                         io_mapping_unmap(s);
1040
1041                         mb();
1042                         ggtt->vm.clear_range(&ggtt->vm, slot, PAGE_SIZE);
1043                         mutex_unlock(&ggtt->error_mutex);
1044                         if (ret)
1045                                 break;
1046                 }
1047         } else if (i915_gem_object_is_lmem(vma->obj)) {
1048                 struct intel_memory_region *mem = vma->obj->mm.region;
1049                 dma_addr_t dma;
1050
1051                 for_each_sgt_daddr(dma, iter, vma->pages) {
1052                         void __iomem *s;
1053
1054                         s = io_mapping_map_wc(&mem->iomap,
1055                                               dma - mem->region.start,
1056                                               PAGE_SIZE);
1057                         ret = compress_page(compress,
1058                                             (void __force *)s, dst,
1059                                             true);
1060                         io_mapping_unmap(s);
1061                         if (ret)
1062                                 break;
1063                 }
1064         } else {
1065                 struct page *page;
1066
1067                 for_each_sgt_page(page, iter, vma->pages) {
1068                         void *s;
1069
1070                         drm_clflush_pages(&page, 1);
1071
1072                         s = kmap(page);
1073                         ret = compress_page(compress, s, dst, false);
1074                         kunmap(page);
1075
1076                         drm_clflush_pages(&page, 1);
1077
1078                         if (ret)
1079                                 break;
1080                 }
1081         }
1082
1083         if (ret || compress_flush(compress, dst)) {
1084                 while (dst->page_count--)
1085                         pool_free(&compress->pool, dst->pages[dst->page_count]);
1086                 kfree(dst);
1087                 dst = NULL;
1088         }
1089         compress_finish(compress);
1090
1091         return dst;
1092 }
1093
1094 static void gt_record_fences(struct intel_gt_coredump *gt)
1095 {
1096         struct i915_ggtt *ggtt = gt->_gt->ggtt;
1097         struct intel_uncore *uncore = gt->_gt->uncore;
1098         int i;
1099
1100         if (INTEL_GEN(uncore->i915) >= 6) {
1101                 for (i = 0; i < ggtt->num_fences; i++)
1102                         gt->fence[i] =
1103                                 intel_uncore_read64(uncore,
1104                                                     FENCE_REG_GEN6_LO(i));
1105         } else if (INTEL_GEN(uncore->i915) >= 4) {
1106                 for (i = 0; i < ggtt->num_fences; i++)
1107                         gt->fence[i] =
1108                                 intel_uncore_read64(uncore,
1109                                                     FENCE_REG_965_LO(i));
1110         } else {
1111                 for (i = 0; i < ggtt->num_fences; i++)
1112                         gt->fence[i] =
1113                                 intel_uncore_read(uncore, FENCE_REG(i));
1114         }
1115         gt->nfence = i;
1116 }
1117
1118 static void engine_record_registers(struct intel_engine_coredump *ee)
1119 {
1120         const struct intel_engine_cs *engine = ee->engine;
1121         struct drm_i915_private *i915 = engine->i915;
1122
1123         if (INTEL_GEN(i915) >= 6) {
1124                 ee->rc_psmi = ENGINE_READ(engine, RING_PSMI_CTL);
1125
1126                 if (INTEL_GEN(i915) >= 12)
1127                         ee->fault_reg = intel_uncore_read(engine->uncore,
1128                                                           GEN12_RING_FAULT_REG);
1129                 else if (INTEL_GEN(i915) >= 8)
1130                         ee->fault_reg = intel_uncore_read(engine->uncore,
1131                                                           GEN8_RING_FAULT_REG);
1132                 else
1133                         ee->fault_reg = GEN6_RING_FAULT_REG_READ(engine);
1134         }
1135
1136         if (INTEL_GEN(i915) >= 4) {
1137                 ee->esr = ENGINE_READ(engine, RING_ESR);
1138                 ee->faddr = ENGINE_READ(engine, RING_DMA_FADD);
1139                 ee->ipeir = ENGINE_READ(engine, RING_IPEIR);
1140                 ee->ipehr = ENGINE_READ(engine, RING_IPEHR);
1141                 ee->instps = ENGINE_READ(engine, RING_INSTPS);
1142                 ee->bbaddr = ENGINE_READ(engine, RING_BBADDR);
1143                 ee->ccid = ENGINE_READ(engine, CCID);
1144                 if (INTEL_GEN(i915) >= 8) {
1145                         ee->faddr |= (u64)ENGINE_READ(engine, RING_DMA_FADD_UDW) << 32;
1146                         ee->bbaddr |= (u64)ENGINE_READ(engine, RING_BBADDR_UDW) << 32;
1147                 }
1148                 ee->bbstate = ENGINE_READ(engine, RING_BBSTATE);
1149         } else {
1150                 ee->faddr = ENGINE_READ(engine, DMA_FADD_I8XX);
1151                 ee->ipeir = ENGINE_READ(engine, IPEIR);
1152                 ee->ipehr = ENGINE_READ(engine, IPEHR);
1153         }
1154
1155         intel_engine_get_instdone(engine, &ee->instdone);
1156
1157         ee->instpm = ENGINE_READ(engine, RING_INSTPM);
1158         ee->acthd = intel_engine_get_active_head(engine);
1159         ee->start = ENGINE_READ(engine, RING_START);
1160         ee->head = ENGINE_READ(engine, RING_HEAD);
1161         ee->tail = ENGINE_READ(engine, RING_TAIL);
1162         ee->ctl = ENGINE_READ(engine, RING_CTL);
1163         if (INTEL_GEN(i915) > 2)
1164                 ee->mode = ENGINE_READ(engine, RING_MI_MODE);
1165
1166         if (!HWS_NEEDS_PHYSICAL(i915)) {
1167                 i915_reg_t mmio;
1168
1169                 if (IS_GEN(i915, 7)) {
1170                         switch (engine->id) {
1171                         default:
1172                                 MISSING_CASE(engine->id);
1173                                 fallthrough;
1174                         case RCS0:
1175                                 mmio = RENDER_HWS_PGA_GEN7;
1176                                 break;
1177                         case BCS0:
1178                                 mmio = BLT_HWS_PGA_GEN7;
1179                                 break;
1180                         case VCS0:
1181                                 mmio = BSD_HWS_PGA_GEN7;
1182                                 break;
1183                         case VECS0:
1184                                 mmio = VEBOX_HWS_PGA_GEN7;
1185                                 break;
1186                         }
1187                 } else if (IS_GEN(engine->i915, 6)) {
1188                         mmio = RING_HWS_PGA_GEN6(engine->mmio_base);
1189                 } else {
1190                         /* XXX: gen8 returns to sanity */
1191                         mmio = RING_HWS_PGA(engine->mmio_base);
1192                 }
1193
1194                 ee->hws = intel_uncore_read(engine->uncore, mmio);
1195         }
1196
1197         ee->reset_count = i915_reset_engine_count(&i915->gpu_error, engine);
1198
1199         if (HAS_PPGTT(i915)) {
1200                 int i;
1201
1202                 ee->vm_info.gfx_mode = ENGINE_READ(engine, RING_MODE_GEN7);
1203
1204                 if (IS_GEN(i915, 6)) {
1205                         ee->vm_info.pp_dir_base =
1206                                 ENGINE_READ(engine, RING_PP_DIR_BASE_READ);
1207                 } else if (IS_GEN(i915, 7)) {
1208                         ee->vm_info.pp_dir_base =
1209                                 ENGINE_READ(engine, RING_PP_DIR_BASE);
1210                 } else if (INTEL_GEN(i915) >= 8) {
1211                         u32 base = engine->mmio_base;
1212
1213                         for (i = 0; i < 4; i++) {
1214                                 ee->vm_info.pdp[i] =
1215                                         intel_uncore_read(engine->uncore,
1216                                                           GEN8_RING_PDP_UDW(base, i));
1217                                 ee->vm_info.pdp[i] <<= 32;
1218                                 ee->vm_info.pdp[i] |=
1219                                         intel_uncore_read(engine->uncore,
1220                                                           GEN8_RING_PDP_LDW(base, i));
1221                         }
1222                 }
1223         }
1224 }
1225
1226 static void record_request(const struct i915_request *request,
1227                            struct i915_request_coredump *erq)
1228 {
1229         erq->flags = request->fence.flags;
1230         erq->context = request->fence.context;
1231         erq->seqno = request->fence.seqno;
1232         erq->sched_attr = request->sched.attr;
1233         erq->head = request->head;
1234         erq->tail = request->tail;
1235
1236         erq->pid = 0;
1237         rcu_read_lock();
1238         if (!intel_context_is_closed(request->context)) {
1239                 const struct i915_gem_context *ctx;
1240
1241                 ctx = rcu_dereference(request->context->gem_context);
1242                 if (ctx)
1243                         erq->pid = pid_nr(ctx->pid);
1244         }
1245         rcu_read_unlock();
1246 }
1247
1248 static void engine_record_execlists(struct intel_engine_coredump *ee)
1249 {
1250         const struct intel_engine_execlists * const el = &ee->engine->execlists;
1251         struct i915_request * const *port = el->active;
1252         unsigned int n = 0;
1253
1254         while (*port)
1255                 record_request(*port++, &ee->execlist[n++]);
1256
1257         ee->num_ports = n;
1258 }
1259
1260 static bool record_context(struct i915_gem_context_coredump *e,
1261                            const struct i915_request *rq)
1262 {
1263         struct i915_gem_context *ctx;
1264         struct task_struct *task;
1265         bool simulated;
1266
1267         rcu_read_lock();
1268         ctx = rcu_dereference(rq->context->gem_context);
1269         if (ctx && !kref_get_unless_zero(&ctx->ref))
1270                 ctx = NULL;
1271         rcu_read_unlock();
1272         if (!ctx)
1273                 return true;
1274
1275         rcu_read_lock();
1276         task = pid_task(ctx->pid, PIDTYPE_PID);
1277         if (task) {
1278                 strcpy(e->comm, task->comm);
1279                 e->pid = task->pid;
1280         }
1281         rcu_read_unlock();
1282
1283         e->sched_attr = ctx->sched;
1284         e->guilty = atomic_read(&ctx->guilty_count);
1285         e->active = atomic_read(&ctx->active_count);
1286
1287         e->total_runtime = rq->context->runtime.total;
1288         e->avg_runtime = ewma_runtime_read(&rq->context->runtime.avg);
1289
1290         simulated = i915_gem_context_no_error_capture(ctx);
1291
1292         i915_gem_context_put(ctx);
1293         return simulated;
1294 }
1295
1296 struct intel_engine_capture_vma {
1297         struct intel_engine_capture_vma *next;
1298         struct i915_vma *vma;
1299         char name[16];
1300 };
1301
1302 static struct intel_engine_capture_vma *
1303 capture_vma(struct intel_engine_capture_vma *next,
1304             struct i915_vma *vma,
1305             const char *name,
1306             gfp_t gfp)
1307 {
1308         struct intel_engine_capture_vma *c;
1309
1310         if (!vma)
1311                 return next;
1312
1313         c = kmalloc(sizeof(*c), gfp);
1314         if (!c)
1315                 return next;
1316
1317         if (!i915_active_acquire_if_busy(&vma->active)) {
1318                 kfree(c);
1319                 return next;
1320         }
1321
1322         strcpy(c->name, name);
1323         c->vma = vma; /* reference held while active */
1324
1325         c->next = next;
1326         return c;
1327 }
1328
1329 static struct intel_engine_capture_vma *
1330 capture_user(struct intel_engine_capture_vma *capture,
1331              const struct i915_request *rq,
1332              gfp_t gfp)
1333 {
1334         struct i915_capture_list *c;
1335
1336         for (c = rq->capture_list; c; c = c->next)
1337                 capture = capture_vma(capture, c->vma, "user", gfp);
1338
1339         return capture;
1340 }
1341
1342 static void add_vma(struct intel_engine_coredump *ee,
1343                     struct i915_vma_coredump *vma)
1344 {
1345         if (vma) {
1346                 vma->next = ee->vma;
1347                 ee->vma = vma;
1348         }
1349 }
1350
1351 struct intel_engine_coredump *
1352 intel_engine_coredump_alloc(struct intel_engine_cs *engine, gfp_t gfp)
1353 {
1354         struct intel_engine_coredump *ee;
1355
1356         ee = kzalloc(sizeof(*ee), gfp);
1357         if (!ee)
1358                 return NULL;
1359
1360         ee->engine = engine;
1361
1362         engine_record_registers(ee);
1363         engine_record_execlists(ee);
1364
1365         return ee;
1366 }
1367
1368 struct intel_engine_capture_vma *
1369 intel_engine_coredump_add_request(struct intel_engine_coredump *ee,
1370                                   struct i915_request *rq,
1371                                   gfp_t gfp)
1372 {
1373         struct intel_engine_capture_vma *vma = NULL;
1374
1375         ee->simulated |= record_context(&ee->context, rq);
1376         if (ee->simulated)
1377                 return NULL;
1378
1379         /*
1380          * We need to copy these to an anonymous buffer
1381          * as the simplest method to avoid being overwritten
1382          * by userspace.
1383          */
1384         vma = capture_vma(vma, rq->batch, "batch", gfp);
1385         vma = capture_user(vma, rq, gfp);
1386         vma = capture_vma(vma, rq->ring->vma, "ring", gfp);
1387         vma = capture_vma(vma, rq->context->state, "HW context", gfp);
1388
1389         ee->rq_head = rq->head;
1390         ee->rq_post = rq->postfix;
1391         ee->rq_tail = rq->tail;
1392
1393         return vma;
1394 }
1395
1396 void
1397 intel_engine_coredump_add_vma(struct intel_engine_coredump *ee,
1398                               struct intel_engine_capture_vma *capture,
1399                               struct i915_vma_compress *compress)
1400 {
1401         const struct intel_engine_cs *engine = ee->engine;
1402
1403         while (capture) {
1404                 struct intel_engine_capture_vma *this = capture;
1405                 struct i915_vma *vma = this->vma;
1406
1407                 add_vma(ee,
1408                         i915_vma_coredump_create(engine->gt,
1409                                                  vma, this->name,
1410                                                  compress));
1411
1412                 i915_active_release(&vma->active);
1413
1414                 capture = this->next;
1415                 kfree(this);
1416         }
1417
1418         add_vma(ee,
1419                 i915_vma_coredump_create(engine->gt,
1420                                          engine->status_page.vma,
1421                                          "HW Status",
1422                                          compress));
1423
1424         add_vma(ee,
1425                 i915_vma_coredump_create(engine->gt,
1426                                          engine->wa_ctx.vma,
1427                                          "WA context",
1428                                          compress));
1429 }
1430
1431 static struct intel_engine_coredump *
1432 capture_engine(struct intel_engine_cs *engine,
1433                struct i915_vma_compress *compress)
1434 {
1435         struct intel_engine_capture_vma *capture = NULL;
1436         struct intel_engine_coredump *ee;
1437         struct i915_request *rq;
1438         unsigned long flags;
1439
1440         ee = intel_engine_coredump_alloc(engine, GFP_KERNEL);
1441         if (!ee)
1442                 return NULL;
1443
1444         spin_lock_irqsave(&engine->active.lock, flags);
1445         rq = intel_engine_find_active_request(engine);
1446         if (rq)
1447                 capture = intel_engine_coredump_add_request(ee, rq,
1448                                                             ATOMIC_MAYFAIL);
1449         spin_unlock_irqrestore(&engine->active.lock, flags);
1450         if (!capture) {
1451                 kfree(ee);
1452                 return NULL;
1453         }
1454
1455         intel_engine_coredump_add_vma(ee, capture, compress);
1456
1457         return ee;
1458 }
1459
1460 static void
1461 gt_record_engines(struct intel_gt_coredump *gt,
1462                   intel_engine_mask_t engine_mask,
1463                   struct i915_vma_compress *compress)
1464 {
1465         struct intel_engine_cs *engine;
1466         enum intel_engine_id id;
1467
1468         for_each_engine(engine, gt->_gt, id) {
1469                 struct intel_engine_coredump *ee;
1470
1471                 /* Refill our page pool before entering atomic section */
1472                 pool_refill(&compress->pool, ALLOW_FAIL);
1473
1474                 ee = capture_engine(engine, compress);
1475                 if (!ee)
1476                         continue;
1477
1478                 ee->hung = engine->mask & engine_mask;
1479
1480                 gt->simulated |= ee->simulated;
1481                 if (ee->simulated) {
1482                         kfree(ee);
1483                         continue;
1484                 }
1485
1486                 ee->next = gt->engine;
1487                 gt->engine = ee;
1488         }
1489 }
1490
1491 static struct intel_uc_coredump *
1492 gt_record_uc(struct intel_gt_coredump *gt,
1493              struct i915_vma_compress *compress)
1494 {
1495         const struct intel_uc *uc = &gt->_gt->uc;
1496         struct intel_uc_coredump *error_uc;
1497
1498         error_uc = kzalloc(sizeof(*error_uc), ALLOW_FAIL);
1499         if (!error_uc)
1500                 return NULL;
1501
1502         memcpy(&error_uc->guc_fw, &uc->guc.fw, sizeof(uc->guc.fw));
1503         memcpy(&error_uc->huc_fw, &uc->huc.fw, sizeof(uc->huc.fw));
1504
1505         /* Non-default firmware paths will be specified by the modparam.
1506          * As modparams are generally accesible from the userspace make
1507          * explicit copies of the firmware paths.
1508          */
1509         error_uc->guc_fw.path = kstrdup(uc->guc.fw.path, ALLOW_FAIL);
1510         error_uc->huc_fw.path = kstrdup(uc->huc.fw.path, ALLOW_FAIL);
1511         error_uc->guc_log =
1512                 i915_vma_coredump_create(gt->_gt,
1513                                          uc->guc.log.vma, "GuC log buffer",
1514                                          compress);
1515
1516         return error_uc;
1517 }
1518
1519 /* Capture all registers which don't fit into another category. */
1520 static void gt_record_regs(struct intel_gt_coredump *gt)
1521 {
1522         struct intel_uncore *uncore = gt->_gt->uncore;
1523         struct drm_i915_private *i915 = uncore->i915;
1524         int i;
1525
1526         /*
1527          * General organization
1528          * 1. Registers specific to a single generation
1529          * 2. Registers which belong to multiple generations
1530          * 3. Feature specific registers.
1531          * 4. Everything else
1532          * Please try to follow the order.
1533          */
1534
1535         /* 1: Registers specific to a single generation */
1536         if (IS_VALLEYVIEW(i915)) {
1537                 gt->gtier[0] = intel_uncore_read(uncore, GTIER);
1538                 gt->ier = intel_uncore_read(uncore, VLV_IER);
1539                 gt->forcewake = intel_uncore_read_fw(uncore, FORCEWAKE_VLV);
1540         }
1541
1542         if (IS_GEN(i915, 7))
1543                 gt->err_int = intel_uncore_read(uncore, GEN7_ERR_INT);
1544
1545         if (INTEL_GEN(i915) >= 12) {
1546                 gt->fault_data0 = intel_uncore_read(uncore,
1547                                                     GEN12_FAULT_TLB_DATA0);
1548                 gt->fault_data1 = intel_uncore_read(uncore,
1549                                                     GEN12_FAULT_TLB_DATA1);
1550         } else if (INTEL_GEN(i915) >= 8) {
1551                 gt->fault_data0 = intel_uncore_read(uncore,
1552                                                     GEN8_FAULT_TLB_DATA0);
1553                 gt->fault_data1 = intel_uncore_read(uncore,
1554                                                     GEN8_FAULT_TLB_DATA1);
1555         }
1556
1557         if (IS_GEN(i915, 6)) {
1558                 gt->forcewake = intel_uncore_read_fw(uncore, FORCEWAKE);
1559                 gt->gab_ctl = intel_uncore_read(uncore, GAB_CTL);
1560                 gt->gfx_mode = intel_uncore_read(uncore, GFX_MODE);
1561         }
1562
1563         /* 2: Registers which belong to multiple generations */
1564         if (INTEL_GEN(i915) >= 7)
1565                 gt->forcewake = intel_uncore_read_fw(uncore, FORCEWAKE_MT);
1566
1567         if (INTEL_GEN(i915) >= 6) {
1568                 gt->derrmr = intel_uncore_read(uncore, DERRMR);
1569                 if (INTEL_GEN(i915) < 12) {
1570                         gt->error = intel_uncore_read(uncore, ERROR_GEN6);
1571                         gt->done_reg = intel_uncore_read(uncore, DONE_REG);
1572                 }
1573         }
1574
1575         /* 3: Feature specific registers */
1576         if (IS_GEN_RANGE(i915, 6, 7)) {
1577                 gt->gam_ecochk = intel_uncore_read(uncore, GAM_ECOCHK);
1578                 gt->gac_eco = intel_uncore_read(uncore, GAC_ECO_BITS);
1579         }
1580
1581         if (IS_GEN_RANGE(i915, 8, 11))
1582                 gt->gtt_cache = intel_uncore_read(uncore, HSW_GTT_CACHE_EN);
1583
1584         if (IS_GEN(i915, 12))
1585                 gt->aux_err = intel_uncore_read(uncore, GEN12_AUX_ERR_DBG);
1586
1587         if (INTEL_GEN(i915) >= 12) {
1588                 for (i = 0; i < GEN12_SFC_DONE_MAX; i++) {
1589                         gt->sfc_done[i] =
1590                                 intel_uncore_read(uncore, GEN12_SFC_DONE(i));
1591                 }
1592
1593                 gt->gam_done = intel_uncore_read(uncore, GEN12_GAM_DONE);
1594         }
1595
1596         /* 4: Everything else */
1597         if (INTEL_GEN(i915) >= 11) {
1598                 gt->ier = intel_uncore_read(uncore, GEN8_DE_MISC_IER);
1599                 gt->gtier[0] =
1600                         intel_uncore_read(uncore,
1601                                           GEN11_RENDER_COPY_INTR_ENABLE);
1602                 gt->gtier[1] =
1603                         intel_uncore_read(uncore, GEN11_VCS_VECS_INTR_ENABLE);
1604                 gt->gtier[2] =
1605                         intel_uncore_read(uncore, GEN11_GUC_SG_INTR_ENABLE);
1606                 gt->gtier[3] =
1607                         intel_uncore_read(uncore,
1608                                           GEN11_GPM_WGBOXPERF_INTR_ENABLE);
1609                 gt->gtier[4] =
1610                         intel_uncore_read(uncore,
1611                                           GEN11_CRYPTO_RSVD_INTR_ENABLE);
1612                 gt->gtier[5] =
1613                         intel_uncore_read(uncore,
1614                                           GEN11_GUNIT_CSME_INTR_ENABLE);
1615                 gt->ngtier = 6;
1616         } else if (INTEL_GEN(i915) >= 8) {
1617                 gt->ier = intel_uncore_read(uncore, GEN8_DE_MISC_IER);
1618                 for (i = 0; i < 4; i++)
1619                         gt->gtier[i] =
1620                                 intel_uncore_read(uncore, GEN8_GT_IER(i));
1621                 gt->ngtier = 4;
1622         } else if (HAS_PCH_SPLIT(i915)) {
1623                 gt->ier = intel_uncore_read(uncore, DEIER);
1624                 gt->gtier[0] = intel_uncore_read(uncore, GTIER);
1625                 gt->ngtier = 1;
1626         } else if (IS_GEN(i915, 2)) {
1627                 gt->ier = intel_uncore_read16(uncore, GEN2_IER);
1628         } else if (!IS_VALLEYVIEW(i915)) {
1629                 gt->ier = intel_uncore_read(uncore, GEN2_IER);
1630         }
1631         gt->eir = intel_uncore_read(uncore, EIR);
1632         gt->pgtbl_er = intel_uncore_read(uncore, PGTBL_ER);
1633 }
1634
1635 static void gt_record_info(struct intel_gt_coredump *gt)
1636 {
1637         memcpy(&gt->info, &gt->_gt->info, sizeof(struct intel_gt_info));
1638 }
1639
1640 /*
1641  * Generate a semi-unique error code. The code is not meant to have meaning, The
1642  * code's only purpose is to try to prevent false duplicated bug reports by
1643  * grossly estimating a GPU error state.
1644  *
1645  * TODO Ideally, hashing the batchbuffer would be a very nice way to determine
1646  * the hang if we could strip the GTT offset information from it.
1647  *
1648  * It's only a small step better than a random number in its current form.
1649  */
1650 static u32 generate_ecode(const struct intel_engine_coredump *ee)
1651 {
1652         /*
1653          * IPEHR would be an ideal way to detect errors, as it's the gross
1654          * measure of "the command that hung." However, has some very common
1655          * synchronization commands which almost always appear in the case
1656          * strictly a client bug. Use instdone to differentiate those some.
1657          */
1658         return ee ? ee->ipehr ^ ee->instdone.instdone : 0;
1659 }
1660
1661 static const char *error_msg(struct i915_gpu_coredump *error)
1662 {
1663         struct intel_engine_coredump *first = NULL;
1664         unsigned int hung_classes = 0;
1665         struct intel_gt_coredump *gt;
1666         int len;
1667
1668         for (gt = error->gt; gt; gt = gt->next) {
1669                 struct intel_engine_coredump *cs;
1670
1671                 for (cs = gt->engine; cs; cs = cs->next) {
1672                         if (cs->hung) {
1673                                 hung_classes |= BIT(cs->engine->uabi_class);
1674                                 if (!first)
1675                                         first = cs;
1676                         }
1677                 }
1678         }
1679
1680         len = scnprintf(error->error_msg, sizeof(error->error_msg),
1681                         "GPU HANG: ecode %d:%x:%08x",
1682                         INTEL_GEN(error->i915), hung_classes,
1683                         generate_ecode(first));
1684         if (first && first->context.pid) {
1685                 /* Just show the first executing process, more is confusing */
1686                 len += scnprintf(error->error_msg + len,
1687                                  sizeof(error->error_msg) - len,
1688                                  ", in %s [%d]",
1689                                  first->context.comm, first->context.pid);
1690         }
1691
1692         return error->error_msg;
1693 }
1694
1695 static void capture_gen(struct i915_gpu_coredump *error)
1696 {
1697         struct drm_i915_private *i915 = error->i915;
1698
1699         error->wakelock = atomic_read(&i915->runtime_pm.wakeref_count);
1700         error->suspended = i915->runtime_pm.suspended;
1701
1702         error->iommu = -1;
1703 #ifdef CONFIG_INTEL_IOMMU
1704         error->iommu = intel_iommu_gfx_mapped;
1705 #endif
1706         error->reset_count = i915_reset_count(&i915->gpu_error);
1707         error->suspend_count = i915->suspend_count;
1708
1709         i915_params_copy(&error->params, &i915->params);
1710         memcpy(&error->device_info,
1711                INTEL_INFO(i915),
1712                sizeof(error->device_info));
1713         memcpy(&error->runtime_info,
1714                RUNTIME_INFO(i915),
1715                sizeof(error->runtime_info));
1716         error->driver_caps = i915->caps;
1717 }
1718
1719 struct i915_gpu_coredump *
1720 i915_gpu_coredump_alloc(struct drm_i915_private *i915, gfp_t gfp)
1721 {
1722         struct i915_gpu_coredump *error;
1723
1724         if (!i915->params.error_capture)
1725                 return NULL;
1726
1727         error = kzalloc(sizeof(*error), gfp);
1728         if (!error)
1729                 return NULL;
1730
1731         kref_init(&error->ref);
1732         error->i915 = i915;
1733
1734         error->time = ktime_get_real();
1735         error->boottime = ktime_get_boottime();
1736         error->uptime = ktime_sub(ktime_get(), i915->gt.last_init_time);
1737         error->capture = jiffies;
1738
1739         capture_gen(error);
1740
1741         return error;
1742 }
1743
1744 #define DAY_AS_SECONDS(x) (24 * 60 * 60 * (x))
1745
1746 struct intel_gt_coredump *
1747 intel_gt_coredump_alloc(struct intel_gt *gt, gfp_t gfp)
1748 {
1749         struct intel_gt_coredump *gc;
1750
1751         gc = kzalloc(sizeof(*gc), gfp);
1752         if (!gc)
1753                 return NULL;
1754
1755         gc->_gt = gt;
1756         gc->awake = intel_gt_pm_is_awake(gt);
1757
1758         gt_record_regs(gc);
1759         gt_record_fences(gc);
1760
1761         return gc;
1762 }
1763
1764 struct i915_vma_compress *
1765 i915_vma_capture_prepare(struct intel_gt_coredump *gt)
1766 {
1767         struct i915_vma_compress *compress;
1768
1769         compress = kmalloc(sizeof(*compress), ALLOW_FAIL);
1770         if (!compress)
1771                 return NULL;
1772
1773         if (!compress_init(compress)) {
1774                 kfree(compress);
1775                 return NULL;
1776         }
1777
1778         return compress;
1779 }
1780
1781 void i915_vma_capture_finish(struct intel_gt_coredump *gt,
1782                              struct i915_vma_compress *compress)
1783 {
1784         if (!compress)
1785                 return;
1786
1787         compress_fini(compress);
1788         kfree(compress);
1789 }
1790
1791 struct i915_gpu_coredump *
1792 i915_gpu_coredump(struct intel_gt *gt, intel_engine_mask_t engine_mask)
1793 {
1794         struct drm_i915_private *i915 = gt->i915;
1795         struct i915_gpu_coredump *error;
1796
1797         /* Check if GPU capture has been disabled */
1798         error = READ_ONCE(i915->gpu_error.first_error);
1799         if (IS_ERR(error))
1800                 return error;
1801
1802         error = i915_gpu_coredump_alloc(i915, ALLOW_FAIL);
1803         if (!error)
1804                 return ERR_PTR(-ENOMEM);
1805
1806         error->gt = intel_gt_coredump_alloc(gt, ALLOW_FAIL);
1807         if (error->gt) {
1808                 struct i915_vma_compress *compress;
1809
1810                 compress = i915_vma_capture_prepare(error->gt);
1811                 if (!compress) {
1812                         kfree(error->gt);
1813                         kfree(error);
1814                         return ERR_PTR(-ENOMEM);
1815                 }
1816
1817                 gt_record_info(error->gt);
1818                 gt_record_engines(error->gt, engine_mask, compress);
1819
1820                 if (INTEL_INFO(i915)->has_gt_uc)
1821                         error->gt->uc = gt_record_uc(error->gt, compress);
1822
1823                 i915_vma_capture_finish(error->gt, compress);
1824
1825                 error->simulated |= error->gt->simulated;
1826         }
1827
1828         error->overlay = intel_overlay_capture_error_state(i915);
1829         error->display = intel_display_capture_error_state(i915);
1830
1831         return error;
1832 }
1833
1834 void i915_error_state_store(struct i915_gpu_coredump *error)
1835 {
1836         struct drm_i915_private *i915;
1837         static bool warned;
1838
1839         if (IS_ERR_OR_NULL(error))
1840                 return;
1841
1842         i915 = error->i915;
1843         drm_info(&i915->drm, "%s\n", error_msg(error));
1844
1845         if (error->simulated ||
1846             cmpxchg(&i915->gpu_error.first_error, NULL, error))
1847                 return;
1848
1849         i915_gpu_coredump_get(error);
1850
1851         if (!xchg(&warned, true) &&
1852             ktime_get_real_seconds() - DRIVER_TIMESTAMP < DAY_AS_SECONDS(180)) {
1853                 pr_info("GPU hangs can indicate a bug anywhere in the entire gfx stack, including userspace.\n");
1854                 pr_info("Please file a _new_ bug report at https://gitlab.freedesktop.org/drm/intel/issues/new.\n");
1855                 pr_info("Please see https://gitlab.freedesktop.org/drm/intel/-/wikis/How-to-file-i915-bugs for details.\n");
1856                 pr_info("drm/i915 developers can then reassign to the right component if it's not a kernel issue.\n");
1857                 pr_info("The GPU crash dump is required to analyze GPU hangs, so please always attach it.\n");
1858                 pr_info("GPU crash dump saved to /sys/class/drm/card%d/error\n",
1859                         i915->drm.primary->index);
1860         }
1861 }
1862
1863 /**
1864  * i915_capture_error_state - capture an error record for later analysis
1865  * @gt: intel_gt which originated the hang
1866  * @engine_mask: hung engines
1867  *
1868  *
1869  * Should be called when an error is detected (either a hang or an error
1870  * interrupt) to capture error state from the time of the error.  Fills
1871  * out a structure which becomes available in debugfs for user level tools
1872  * to pick up.
1873  */
1874 void i915_capture_error_state(struct intel_gt *gt,
1875                               intel_engine_mask_t engine_mask)
1876 {
1877         struct i915_gpu_coredump *error;
1878
1879         error = i915_gpu_coredump(gt, engine_mask);
1880         if (IS_ERR(error)) {
1881                 cmpxchg(&gt->i915->gpu_error.first_error, NULL, error);
1882                 return;
1883         }
1884
1885         i915_error_state_store(error);
1886         i915_gpu_coredump_put(error);
1887 }
1888
1889 struct i915_gpu_coredump *
1890 i915_first_error_state(struct drm_i915_private *i915)
1891 {
1892         struct i915_gpu_coredump *error;
1893
1894         spin_lock_irq(&i915->gpu_error.lock);
1895         error = i915->gpu_error.first_error;
1896         if (!IS_ERR_OR_NULL(error))
1897                 i915_gpu_coredump_get(error);
1898         spin_unlock_irq(&i915->gpu_error.lock);
1899
1900         return error;
1901 }
1902
1903 void i915_reset_error_state(struct drm_i915_private *i915)
1904 {
1905         struct i915_gpu_coredump *error;
1906
1907         spin_lock_irq(&i915->gpu_error.lock);
1908         error = i915->gpu_error.first_error;
1909         if (error != ERR_PTR(-ENODEV)) /* if disabled, always disabled */
1910                 i915->gpu_error.first_error = NULL;
1911         spin_unlock_irq(&i915->gpu_error.lock);
1912
1913         if (!IS_ERR_OR_NULL(error))
1914                 i915_gpu_coredump_put(error);
1915 }
1916
1917 void i915_disable_error_state(struct drm_i915_private *i915, int err)
1918 {
1919         spin_lock_irq(&i915->gpu_error.lock);
1920         if (!i915->gpu_error.first_error)
1921                 i915->gpu_error.first_error = ERR_PTR(err);
1922         spin_unlock_irq(&i915->gpu_error.lock);
1923 }