drivers/gpu/host1x/job.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Tegra host1x Job
   4  *
   5  * Copyright (c) 2010-2015, NVIDIA Corporation.
   6  */
   7
   8 #include <linux/dma-mapping.h>
   9 #include <linux/err.h>
  10 #include <linux/host1x.h>
  11 #include <linux/iommu.h>
  12 #include <linux/kref.h>
  13 #include <linux/module.h>
  14 #include <linux/scatterlist.h>
  15 #include <linux/slab.h>
  16 #include <linux/vmalloc.h>
  17 #include <trace/events/host1x.h>
  18
  19 #include "channel.h"
  20 #include "dev.h"
  21 #include "job.h"
  22 #include "syncpt.h"
  23
  24 #define HOST1X_WAIT_SYNCPT_OFFSET 0x8
  25
  26 struct host1x_job *host1x_job_alloc(struct host1x_channel *ch,
  27                                     u32 num_cmdbufs, u32 num_relocs,
  28                                     bool skip_firewall)
  29 {
  30         struct host1x_job *job = NULL;
  31         unsigned int num_unpins = num_relocs;
  32         bool enable_firewall;
  33         u64 total;
  34         void *mem;
  35
  36         enable_firewall = IS_ENABLED(CONFIG_TEGRA_HOST1X_FIREWALL) && !skip_firewall;
  37
  38         if (!enable_firewall)
  39                 num_unpins += num_cmdbufs;
  40
  41         /* Check that we're not going to overflow */
  42         total = sizeof(struct host1x_job) +
  43                 (u64)num_relocs * sizeof(struct host1x_reloc) +
  44                 (u64)num_unpins * sizeof(struct host1x_job_unpin_data) +
  45                 (u64)num_cmdbufs * sizeof(struct host1x_job_cmd) +
  46                 (u64)num_unpins * sizeof(dma_addr_t) +
  47                 (u64)num_unpins * sizeof(u32 *);
  48         if (total > ULONG_MAX)
  49                 return NULL;
  50
  51         mem = job = kzalloc(total, GFP_KERNEL);
  52         if (!job)
  53                 return NULL;
  54
  55         job->enable_firewall = enable_firewall;
  56
  57         kref_init(&job->ref);
  58         job->channel = ch;
  59
  60         /* Redistribute memory to the structs  */
  61         mem += sizeof(struct host1x_job);
  62         job->relocs = num_relocs ? mem : NULL;
  63         mem += num_relocs * sizeof(struct host1x_reloc);
  64         job->unpins = num_unpins ? mem : NULL;
  65         mem += num_unpins * sizeof(struct host1x_job_unpin_data);
  66         job->cmds = num_cmdbufs ? mem : NULL;
  67         mem += num_cmdbufs * sizeof(struct host1x_job_cmd);
  68         job->addr_phys = num_unpins ? mem : NULL;
  69
  70         job->reloc_addr_phys = job->addr_phys;
  71         job->gather_addr_phys = &job->addr_phys[num_relocs];
  72
  73         return job;
  74 }
  75 EXPORT_SYMBOL(host1x_job_alloc);
  76
  77 struct host1x_job *host1x_job_get(struct host1x_job *job)
  78 {
  79         kref_get(&job->ref);
  80         return job;
  81 }
  82 EXPORT_SYMBOL(host1x_job_get);
  83
  84 static void job_free(struct kref *ref)
  85 {
  86         struct host1x_job *job = container_of(ref, struct host1x_job, ref);
  87
  88         if (job->release)
  89                 job->release(job);
  90
  91         if (job->fence) {
  92                 /*
  93                  * remove_callback is atomic w.r.t. fence signaling, so
  94                  * after the call returns, we know that the callback is not
  95                  * in execution, and the fence can be safely freed.
  96                  */
  97                 dma_fence_remove_callback(job->fence, &job->fence_cb);
  98                 dma_fence_put(job->fence);
  99         }
 100
 101         if (job->syncpt)
 102                 host1x_syncpt_put(job->syncpt);
 103
 104         kfree(job);
 105 }
 106
 107 void host1x_job_put(struct host1x_job *job)
 108 {
 109         kref_put(&job->ref, job_free);
 110 }
 111 EXPORT_SYMBOL(host1x_job_put);
 112
 113 void host1x_job_add_gather(struct host1x_job *job, struct host1x_bo *bo,
 114                            unsigned int words, unsigned int offset)
 115 {
 116         struct host1x_job_gather *gather = &job->cmds[job->num_cmds].gather;
 117
 118         gather->words = words;
 119         gather->bo = bo;
 120         gather->offset = offset;
 121
 122         job->num_cmds++;
 123 }
 124 EXPORT_SYMBOL(host1x_job_add_gather);
 125
 126 void host1x_job_add_wait(struct host1x_job *job, u32 id, u32 thresh,
 127                          bool relative, u32 next_class)
 128 {
 129         struct host1x_job_cmd *cmd = &job->cmds[job->num_cmds];
 130
 131         cmd->is_wait = true;
 132         cmd->wait.id = id;
 133         cmd->wait.threshold = thresh;
 134         cmd->wait.next_class = next_class;
 135         cmd->wait.relative = relative;
 136
 137         job->num_cmds++;
 138 }
 139 EXPORT_SYMBOL(host1x_job_add_wait);
 140
 141 static unsigned int pin_job(struct host1x *host, struct host1x_job *job)
 142 {
 143         unsigned long mask = HOST1X_RELOC_READ | HOST1X_RELOC_WRITE;
 144         struct host1x_client *client = job->client;
 145         struct device *dev = client->dev;
 146         struct host1x_job_gather *g;
 147         unsigned int i;
 148         int err;
 149
 150         job->num_unpins = 0;
 151
 152         for (i = 0; i < job->num_relocs; i++) {
 153                 struct host1x_reloc *reloc = &job->relocs[i];
 154                 enum dma_data_direction direction;
 155                 struct host1x_bo_mapping *map;
 156                 struct host1x_bo *bo;
 157
 158                 reloc->target.bo = host1x_bo_get(reloc->target.bo);
 159                 if (!reloc->target.bo) {
 160                         err = -EINVAL;
 161                         goto unpin;
 162                 }
 163
 164                 bo = reloc->target.bo;
 165
 166                 switch (reloc->flags & mask) {
 167                 case HOST1X_RELOC_READ:
 168                         direction = DMA_TO_DEVICE;
 169                         break;
 170
 171                 case HOST1X_RELOC_WRITE:
 172                         direction = DMA_FROM_DEVICE;
 173                         break;
 174
 175                 case HOST1X_RELOC_READ | HOST1X_RELOC_WRITE:
 176                         direction = DMA_BIDIRECTIONAL;
 177                         break;
 178
 179                 default:
 180                         err = -EINVAL;
 181                         goto unpin;
 182                 }
 183
 184                 map = host1x_bo_pin(dev, bo, direction, NULL);
 185                 if (IS_ERR(map)) {
 186                         err = PTR_ERR(map);
 187                         goto unpin;
 188                 }
 189
 190                 /*
 191                  * host1x clients are generally not able to do scatter-gather themselves, so fail
 192                  * if the buffer is discontiguous and we fail to map its SG table to a single
 193                  * contiguous chunk of I/O virtual memory.
 194                  */
 195                 if (map->chunks > 1) {
 196                         err = -EINVAL;
 197                         goto unpin;
 198                 }
 199
 200                 job->addr_phys[job->num_unpins] = map->phys;
 201                 job->unpins[job->num_unpins].map = map;
 202                 job->num_unpins++;
 203         }
 204
 205         /*
 206          * We will copy gathers BO content later, so there is no need to
 207          * hold and pin them.
 208          */
 209         if (job->enable_firewall)
 210                 return 0;
 211
 212         for (i = 0; i < job->num_cmds; i++) {
 213                 struct host1x_bo_mapping *map;
 214                 size_t gather_size = 0;
 215                 struct scatterlist *sg;
 216                 unsigned long shift;
 217                 struct iova *alloc;
 218                 unsigned int j;
 219
 220                 if (job->cmds[i].is_wait)
 221                         continue;
 222
 223                 g = &job->cmds[i].gather;
 224
 225                 g->bo = host1x_bo_get(g->bo);
 226                 if (!g->bo) {
 227                         err = -EINVAL;
 228                         goto unpin;
 229                 }
 230
 231                 map = host1x_bo_pin(host->dev, g->bo, DMA_TO_DEVICE, NULL);
 232                 if (IS_ERR(map)) {
 233                         err = PTR_ERR(map);
 234                         goto unpin;
 235                 }
 236
 237                 if (host->domain) {
 238                         for_each_sgtable_sg(map->sgt, sg, j)
 239                                 gather_size += sg->length;
 240
 241                         gather_size = iova_align(&host->iova, gather_size);
 242
 243                         shift = iova_shift(&host->iova);
 244                         alloc = alloc_iova(&host->iova, gather_size >> shift,
 245                                            host->iova_end >> shift, true);
 246                         if (!alloc) {
 247                                 err = -ENOMEM;
 248                                 goto put;
 249                         }
 250
 251                         err = iommu_map_sgtable(host->domain, iova_dma_addr(&host->iova, alloc),
 252                                                 map->sgt, IOMMU_READ);
 253                         if (err == 0) {
 254                                 __free_iova(&host->iova, alloc);
 255                                 err = -EINVAL;
 256                                 goto put;
 257                         }
 258
 259                         map->phys = iova_dma_addr(&host->iova, alloc);
 260                         map->size = gather_size;
 261                 }
 262
 263                 job->addr_phys[job->num_unpins] = map->phys;
 264                 job->unpins[job->num_unpins].map = map;
 265                 job->num_unpins++;
 266
 267                 job->gather_addr_phys[i] = map->phys;
 268         }
 269
 270         return 0;
 271
 272 put:
 273         host1x_bo_put(g->bo);
 274 unpin:
 275         host1x_job_unpin(job);
 276         return err;
 277 }
 278
 279 static int do_relocs(struct host1x_job *job, struct host1x_job_gather *g)
 280 {
 281         void *cmdbuf_addr = NULL;
 282         struct host1x_bo *cmdbuf = g->bo;
 283         unsigned int i;
 284
 285         /* pin & patch the relocs for one gather */
 286         for (i = 0; i < job->num_relocs; i++) {
 287                 struct host1x_reloc *reloc = &job->relocs[i];
 288                 u32 reloc_addr = (job->reloc_addr_phys[i] +
 289                                   reloc->target.offset) >> reloc->shift;
 290                 u32 *target;
 291
 292                 /* skip all other gathers */
 293                 if (cmdbuf != reloc->cmdbuf.bo)
 294                         continue;
 295
 296                 if (job->enable_firewall) {
 297                         target = (u32 *)job->gather_copy_mapped +
 298                                         reloc->cmdbuf.offset / sizeof(u32) +
 299                                                 g->offset / sizeof(u32);
 300                         goto patch_reloc;
 301                 }
 302
 303                 if (!cmdbuf_addr) {
 304                         cmdbuf_addr = host1x_bo_mmap(cmdbuf);
 305
 306                         if (unlikely(!cmdbuf_addr)) {
 307                                 pr_err("Could not map cmdbuf for relocation\n");
 308                                 return -ENOMEM;
 309                         }
 310                 }
 311
 312                 target = cmdbuf_addr + reloc->cmdbuf.offset;
 313 patch_reloc:
 314                 *target = reloc_addr;
 315         }
 316
 317         if (cmdbuf_addr)
 318                 host1x_bo_munmap(cmdbuf, cmdbuf_addr);
 319
 320         return 0;
 321 }
 322
 323 static bool check_reloc(struct host1x_reloc *reloc, struct host1x_bo *cmdbuf,
 324                         unsigned int offset)
 325 {
 326         offset *= sizeof(u32);
 327
 328         if (reloc->cmdbuf.bo != cmdbuf || reloc->cmdbuf.offset != offset)
 329                 return false;
 330
 331         /* relocation shift value validation isn't implemented yet */
 332         if (reloc->shift)
 333                 return false;
 334
 335         return true;
 336 }
 337
 338 struct host1x_firewall {
 339         struct host1x_job *job;
 340         struct device *dev;
 341
 342         unsigned int num_relocs;
 343         struct host1x_reloc *reloc;
 344
 345         struct host1x_bo *cmdbuf;
 346         unsigned int offset;
 347
 348         u32 words;
 349         u32 class;
 350         u32 reg;
 351         u32 mask;
 352         u32 count;
 353 };
 354
 355 static int check_register(struct host1x_firewall *fw, unsigned long offset)
 356 {
 357         if (!fw->job->is_addr_reg)
 358                 return 0;
 359
 360         if (fw->job->is_addr_reg(fw->dev, fw->class, offset)) {
 361                 if (!fw->num_relocs)
 362                         return -EINVAL;
 363
 364                 if (!check_reloc(fw->reloc, fw->cmdbuf, fw->offset))
 365                         return -EINVAL;
 366
 367                 fw->num_relocs--;
 368                 fw->reloc++;
 369         }
 370
 371         return 0;
 372 }
 373
 374 static int check_class(struct host1x_firewall *fw, u32 class)
 375 {
 376         if (!fw->job->is_valid_class) {
 377                 if (fw->class != class)
 378                         return -EINVAL;
 379         } else {
 380                 if (!fw->job->is_valid_class(fw->class))
 381                         return -EINVAL;
 382         }
 383
 384         return 0;
 385 }
 386
 387 static int check_mask(struct host1x_firewall *fw)
 388 {
 389         u32 mask = fw->mask;
 390         u32 reg = fw->reg;
 391         int ret;
 392
 393         while (mask) {
 394                 if (fw->words == 0)
 395                         return -EINVAL;
 396
 397                 if (mask & 1) {
 398                         ret = check_register(fw, reg);
 399                         if (ret < 0)
 400                                 return ret;
 401
 402                         fw->words--;
 403                         fw->offset++;
 404                 }
 405                 mask >>= 1;
 406                 reg++;
 407         }
 408
 409         return 0;
 410 }
 411
 412 static int check_incr(struct host1x_firewall *fw)
 413 {
 414         u32 count = fw->count;
 415         u32 reg = fw->reg;
 416         int ret;
 417
 418         while (count) {
 419                 if (fw->words == 0)
 420                         return -EINVAL;
 421
 422                 ret = check_register(fw, reg);
 423                 if (ret < 0)
 424                         return ret;
 425
 426                 reg++;
 427                 fw->words--;
 428                 fw->offset++;
 429                 count--;
 430         }
 431
 432         return 0;
 433 }
 434
 435 static int check_nonincr(struct host1x_firewall *fw)
 436 {
 437         u32 count = fw->count;
 438         int ret;
 439
 440         while (count) {
 441                 if (fw->words == 0)
 442                         return -EINVAL;
 443
 444                 ret = check_register(fw, fw->reg);
 445                 if (ret < 0)
 446                         return ret;
 447
 448                 fw->words--;
 449                 fw->offset++;
 450                 count--;
 451         }
 452
 453         return 0;
 454 }
 455
 456 static int validate(struct host1x_firewall *fw, struct host1x_job_gather *g)
 457 {
 458         u32 *cmdbuf_base = (u32 *)fw->job->gather_copy_mapped +
 459                 (g->offset / sizeof(u32));
 460         u32 job_class = fw->class;
 461         int err = 0;
 462
 463         fw->words = g->words;
 464         fw->cmdbuf = g->bo;
 465         fw->offset = 0;
 466
 467         while (fw->words && !err) {
 468                 u32 word = cmdbuf_base[fw->offset];
 469                 u32 opcode = (word & 0xf0000000) >> 28;
 470
 471                 fw->mask = 0;
 472                 fw->reg = 0;
 473                 fw->count = 0;
 474                 fw->words--;
 475                 fw->offset++;
 476
 477                 switch (opcode) {
 478                 case 0:
 479                         fw->class = word >> 6 & 0x3ff;
 480                         fw->mask = word & 0x3f;
 481                         fw->reg = word >> 16 & 0xfff;
 482                         err = check_class(fw, job_class);
 483                         if (!err)
 484                                 err = check_mask(fw);
 485                         if (err)
 486                                 goto out;
 487                         break;
 488                 case 1:
 489                         fw->reg = word >> 16 & 0xfff;
 490                         fw->count = word & 0xffff;
 491                         err = check_incr(fw);
 492                         if (err)
 493                                 goto out;
 494                         break;
 495
 496                 case 2:
 497                         fw->reg = word >> 16 & 0xfff;
 498                         fw->count = word & 0xffff;
 499                         err = check_nonincr(fw);
 500                         if (err)
 501                                 goto out;
 502                         break;
 503
 504                 case 3:
 505                         fw->mask = word & 0xffff;
 506                         fw->reg = word >> 16 & 0xfff;
 507                         err = check_mask(fw);
 508                         if (err)
 509                                 goto out;
 510                         break;
 511                 case 4:
 512                 case 14:
 513                         break;
 514                 default:
 515                         err = -EINVAL;
 516                         break;
 517                 }
 518         }
 519
 520 out:
 521         return err;
 522 }
 523
 524 static inline int copy_gathers(struct device *host, struct host1x_job *job,
 525                                struct device *dev)
 526 {
 527         struct host1x_firewall fw;
 528         size_t size = 0;
 529         size_t offset = 0;
 530         unsigned int i;
 531
 532         fw.job = job;
 533         fw.dev = dev;
 534         fw.reloc = job->relocs;
 535         fw.num_relocs = job->num_relocs;
 536         fw.class = job->class;
 537
 538         for (i = 0; i < job->num_cmds; i++) {
 539                 struct host1x_job_gather *g;
 540
 541                 if (job->cmds[i].is_wait)
 542                         continue;
 543
 544                 g = &job->cmds[i].gather;
 545
 546                 size += g->words * sizeof(u32);
 547         }
 548
 549         /*
 550          * Try a non-blocking allocation from a higher priority pools first,
 551          * as awaiting for the allocation here is a major performance hit.
 552          */
 553         job->gather_copy_mapped = dma_alloc_wc(host, size, &job->gather_copy,
 554                                                GFP_NOWAIT);
 555
 556         /* the higher priority allocation failed, try the generic-blocking */
 557         if (!job->gather_copy_mapped)
 558                 job->gather_copy_mapped = dma_alloc_wc(host, size,
 559                                                        &job->gather_copy,
 560                                                        GFP_KERNEL);
 561         if (!job->gather_copy_mapped)
 562                 return -ENOMEM;
 563
 564         job->gather_copy_size = size;
 565
 566         for (i = 0; i < job->num_cmds; i++) {
 567                 struct host1x_job_gather *g;
 568                 void *gather;
 569
 570                 if (job->cmds[i].is_wait)
 571                         continue;
 572                 g = &job->cmds[i].gather;
 573
 574                 /* Copy the gather */
 575                 gather = host1x_bo_mmap(g->bo);
 576                 memcpy(job->gather_copy_mapped + offset, gather + g->offset,
 577                        g->words * sizeof(u32));
 578                 host1x_bo_munmap(g->bo, gather);
 579
 580                 /* Store the location in the buffer */
 581                 g->base = job->gather_copy;
 582                 g->offset = offset;
 583
 584                 /* Validate the job */
 585                 if (validate(&fw, g))
 586                         return -EINVAL;
 587
 588                 offset += g->words * sizeof(u32);
 589         }
 590
 591         /* No relocs should remain at this point */
 592         if (fw.num_relocs)
 593                 return -EINVAL;
 594
 595         return 0;
 596 }
 597
 598 int host1x_job_pin(struct host1x_job *job, struct device *dev)
 599 {
 600         int err;
 601         unsigned int i, j;
 602         struct host1x *host = dev_get_drvdata(dev->parent);
 603
 604         /* pin memory */
 605         err = pin_job(host, job);
 606         if (err)
 607                 goto out;
 608
 609         if (job->enable_firewall) {
 610                 err = copy_gathers(host->dev, job, dev);
 611                 if (err)
 612                         goto out;
 613         }
 614
 615         /* patch gathers */
 616         for (i = 0; i < job->num_cmds; i++) {
 617                 struct host1x_job_gather *g;
 618
 619                 if (job->cmds[i].is_wait)
 620                         continue;
 621                 g = &job->cmds[i].gather;
 622
 623                 /* process each gather mem only once */
 624                 if (g->handled)
 625                         continue;
 626
 627                 /* copy_gathers() sets gathers base if firewall is enabled */
 628                 if (!job->enable_firewall)
 629                         g->base = job->gather_addr_phys[i];
 630
 631                 for (j = i + 1; j < job->num_cmds; j++) {
 632                         if (!job->cmds[j].is_wait &&
 633                             job->cmds[j].gather.bo == g->bo) {
 634                                 job->cmds[j].gather.handled = true;
 635                                 job->cmds[j].gather.base = g->base;
 636                         }
 637                 }
 638
 639                 err = do_relocs(job, g);
 640                 if (err)
 641                         break;
 642         }
 643
 644 out:
 645         if (err)
 646                 host1x_job_unpin(job);
 647         wmb();
 648
 649         return err;
 650 }
 651 EXPORT_SYMBOL(host1x_job_pin);
 652
 653 void host1x_job_unpin(struct host1x_job *job)
 654 {
 655         struct host1x *host = dev_get_drvdata(job->channel->dev->parent);
 656         unsigned int i;
 657
 658         for (i = 0; i < job->num_unpins; i++) {
 659                 struct host1x_bo_mapping *map = job->unpins[i].map;
 660                 struct host1x_bo *bo = map->bo;
 661
 662                 if (!job->enable_firewall && map->size && host->domain) {
 663                         iommu_unmap(host->domain, job->addr_phys[i], map->size);
 664                         free_iova(&host->iova, iova_pfn(&host->iova, job->addr_phys[i]));
 665                 }
 666
 667                 host1x_bo_unpin(map);
 668                 host1x_bo_put(bo);
 669         }
 670
 671         job->num_unpins = 0;
 672
 673         if (job->gather_copy_size)
 674                 dma_free_wc(host->dev, job->gather_copy_size,
 675                             job->gather_copy_mapped, job->gather_copy);
 676 }
 677 EXPORT_SYMBOL(host1x_job_unpin);
 678
 679 /*
 680  * Debug routine used to dump job entries
 681  */
 682 void host1x_job_dump(struct device *dev, struct host1x_job *job)
 683 {
 684         dev_dbg(dev, "    SYNCPT_ID   %d\n", job->syncpt->id);
 685         dev_dbg(dev, "    SYNCPT_VAL  %d\n", job->syncpt_end);
 686         dev_dbg(dev, "    FIRST_GET   0x%x\n", job->first_get);
 687         dev_dbg(dev, "    TIMEOUT     %d\n", job->timeout);
 688         dev_dbg(dev, "    NUM_SLOTS   %d\n", job->num_slots);
 689         dev_dbg(dev, "    NUM_HANDLES %d\n", job->num_unpins);
 690 }