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 {
  29         struct host1x_job *job = NULL;
  30         unsigned int num_unpins = num_relocs;
  31         u64 total;
  32         void *mem;
  33
  34         if (!IS_ENABLED(CONFIG_TEGRA_HOST1X_FIREWALL))
  35                 num_unpins += num_cmdbufs;
  36
  37         /* Check that we're not going to overflow */
  38         total = sizeof(struct host1x_job) +
  39                 (u64)num_relocs * sizeof(struct host1x_reloc) +
  40                 (u64)num_unpins * sizeof(struct host1x_job_unpin_data) +
  41                 (u64)num_cmdbufs * sizeof(struct host1x_job_gather) +
  42                 (u64)num_unpins * sizeof(dma_addr_t) +
  43                 (u64)num_unpins * sizeof(u32 *);
  44         if (total > ULONG_MAX)
  45                 return NULL;
  46
  47         mem = job = kzalloc(total, GFP_KERNEL);
  48         if (!job)
  49                 return NULL;
  50
  51         kref_init(&job->ref);
  52         job->channel = ch;
  53
  54         /* Redistribute memory to the structs  */
  55         mem += sizeof(struct host1x_job);
  56         job->relocs = num_relocs ? mem : NULL;
  57         mem += num_relocs * sizeof(struct host1x_reloc);
  58         job->unpins = num_unpins ? mem : NULL;
  59         mem += num_unpins * sizeof(struct host1x_job_unpin_data);
  60         job->gathers = num_cmdbufs ? mem : NULL;
  61         mem += num_cmdbufs * sizeof(struct host1x_job_gather);
  62         job->addr_phys = num_unpins ? mem : NULL;
  63
  64         job->reloc_addr_phys = job->addr_phys;
  65         job->gather_addr_phys = &job->addr_phys[num_relocs];
  66
  67         return job;
  68 }
  69 EXPORT_SYMBOL(host1x_job_alloc);
  70
  71 struct host1x_job *host1x_job_get(struct host1x_job *job)
  72 {
  73         kref_get(&job->ref);
  74         return job;
  75 }
  76 EXPORT_SYMBOL(host1x_job_get);
  77
  78 static void job_free(struct kref *ref)
  79 {
  80         struct host1x_job *job = container_of(ref, struct host1x_job, ref);
  81
  82         kfree(job);
  83 }
  84
  85 void host1x_job_put(struct host1x_job *job)
  86 {
  87         kref_put(&job->ref, job_free);
  88 }
  89 EXPORT_SYMBOL(host1x_job_put);
  90
  91 void host1x_job_add_gather(struct host1x_job *job, struct host1x_bo *bo,
  92                            unsigned int words, unsigned int offset)
  93 {
  94         struct host1x_job_gather *gather = &job->gathers[job->num_gathers];
  95
  96         gather->words = words;
  97         gather->bo = bo;
  98         gather->offset = offset;
  99
 100         job->num_gathers++;
 101 }
 102 EXPORT_SYMBOL(host1x_job_add_gather);
 103
 104 static unsigned int pin_job(struct host1x *host, struct host1x_job *job)
 105 {
 106         struct host1x_client *client = job->client;
 107         struct device *dev = client->dev;
 108         struct host1x_job_gather *g;
 109         struct iommu_domain *domain;
 110         unsigned int i;
 111         int err;
 112
 113         domain = iommu_get_domain_for_dev(dev);
 114         job->num_unpins = 0;
 115
 116         for (i = 0; i < job->num_relocs; i++) {
 117                 struct host1x_reloc *reloc = &job->relocs[i];
 118                 dma_addr_t phys_addr, *phys;
 119                 struct sg_table *sgt;
 120
 121                 reloc->target.bo = host1x_bo_get(reloc->target.bo);
 122                 if (!reloc->target.bo) {
 123                         err = -EINVAL;
 124                         goto unpin;
 125                 }
 126
 127                 /*
 128                  * If the client device is not attached to an IOMMU, the
 129                  * physical address of the buffer object can be used.
 130                  *
 131                  * Similarly, when an IOMMU domain is shared between all
 132                  * host1x clients, the IOVA is already available, so no
 133                  * need to map the buffer object again.
 134                  *
 135                  * XXX Note that this isn't always safe to do because it
 136                  * relies on an assumption that no cache maintenance is
 137                  * needed on the buffer objects.
 138                  */
 139                 if (!domain || client->group)
 140                         phys = &phys_addr;
 141                 else
 142                         phys = NULL;
 143
 144                 sgt = host1x_bo_pin(dev, reloc->target.bo, phys);
 145                 if (IS_ERR(sgt)) {
 146                         err = PTR_ERR(sgt);
 147                         goto unpin;
 148                 }
 149
 150                 if (sgt) {
 151                         unsigned long mask = HOST1X_RELOC_READ |
 152                                              HOST1X_RELOC_WRITE;
 153                         enum dma_data_direction dir;
 154
 155                         switch (reloc->flags & mask) {
 156                         case HOST1X_RELOC_READ:
 157                                 dir = DMA_TO_DEVICE;
 158                                 break;
 159
 160                         case HOST1X_RELOC_WRITE:
 161                                 dir = DMA_FROM_DEVICE;
 162                                 break;
 163
 164                         case HOST1X_RELOC_READ | HOST1X_RELOC_WRITE:
 165                                 dir = DMA_BIDIRECTIONAL;
 166                                 break;
 167
 168                         default:
 169                                 err = -EINVAL;
 170                                 goto unpin;
 171                         }
 172
 173                         err = dma_map_sgtable(dev, sgt, dir, 0);
 174                         if (err)
 175                                 goto unpin;
 176
 177                         job->unpins[job->num_unpins].dev = dev;
 178                         job->unpins[job->num_unpins].dir = dir;
 179                         phys_addr = sg_dma_address(sgt->sgl);
 180                 }
 181
 182                 job->addr_phys[job->num_unpins] = phys_addr;
 183                 job->unpins[job->num_unpins].bo = reloc->target.bo;
 184                 job->unpins[job->num_unpins].sgt = sgt;
 185                 job->num_unpins++;
 186         }
 187
 188         /*
 189          * We will copy gathers BO content later, so there is no need to
 190          * hold and pin them.
 191          */
 192         if (IS_ENABLED(CONFIG_TEGRA_HOST1X_FIREWALL))
 193                 return 0;
 194
 195         for (i = 0; i < job->num_gathers; i++) {
 196                 size_t gather_size = 0;
 197                 struct scatterlist *sg;
 198                 struct sg_table *sgt;
 199                 dma_addr_t phys_addr;
 200                 unsigned long shift;
 201                 struct iova *alloc;
 202                 dma_addr_t *phys;
 203                 unsigned int j;
 204
 205                 g = &job->gathers[i];
 206                 g->bo = host1x_bo_get(g->bo);
 207                 if (!g->bo) {
 208                         err = -EINVAL;
 209                         goto unpin;
 210                 }
 211
 212                 /**
 213                  * If the host1x is not attached to an IOMMU, there is no need
 214                  * to map the buffer object for the host1x, since the physical
 215                  * address can simply be used.
 216                  */
 217                 if (!iommu_get_domain_for_dev(host->dev))
 218                         phys = &phys_addr;
 219                 else
 220                         phys = NULL;
 221
 222                 sgt = host1x_bo_pin(host->dev, g->bo, phys);
 223                 if (IS_ERR(sgt)) {
 224                         err = PTR_ERR(sgt);
 225                         goto put;
 226                 }
 227
 228                 if (host->domain) {
 229                         for_each_sgtable_sg(sgt, sg, j)
 230                                 gather_size += sg->length;
 231                         gather_size = iova_align(&host->iova, gather_size);
 232
 233                         shift = iova_shift(&host->iova);
 234                         alloc = alloc_iova(&host->iova, gather_size >> shift,
 235                                            host->iova_end >> shift, true);
 236                         if (!alloc) {
 237                                 err = -ENOMEM;
 238                                 goto put;
 239                         }
 240
 241                         err = iommu_map_sgtable(host->domain,
 242                                         iova_dma_addr(&host->iova, alloc),
 243                                         sgt, IOMMU_READ);
 244                         if (err == 0) {
 245                                 __free_iova(&host->iova, alloc);
 246                                 err = -EINVAL;
 247                                 goto put;
 248                         }
 249
 250                         job->unpins[job->num_unpins].size = gather_size;
 251                         phys_addr = iova_dma_addr(&host->iova, alloc);
 252                 } else if (sgt) {
 253                         err = dma_map_sgtable(host->dev, sgt, DMA_TO_DEVICE, 0);
 254                         if (err)
 255                                 goto put;
 256
 257                         job->unpins[job->num_unpins].dir = DMA_TO_DEVICE;
 258                         job->unpins[job->num_unpins].dev = host->dev;
 259                         phys_addr = sg_dma_address(sgt->sgl);
 260                 }
 261
 262                 job->addr_phys[job->num_unpins] = phys_addr;
 263                 job->gather_addr_phys[i] = phys_addr;
 264
 265                 job->unpins[job->num_unpins].bo = g->bo;
 266                 job->unpins[job->num_unpins].sgt = sgt;
 267                 job->num_unpins++;
 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 (IS_ENABLED(CONFIG_TEGRA_HOST1X_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_gathers; i++) {
 539                 struct host1x_job_gather *g = &job->gathers[i];
 540
 541                 size += g->words * sizeof(u32);
 542         }
 543
 544         /*
 545          * Try a non-blocking allocation from a higher priority pools first,
 546          * as awaiting for the allocation here is a major performance hit.
 547          */
 548         job->gather_copy_mapped = dma_alloc_wc(host, size, &job->gather_copy,
 549                                                GFP_NOWAIT);
 550
 551         /* the higher priority allocation failed, try the generic-blocking */
 552         if (!job->gather_copy_mapped)
 553                 job->gather_copy_mapped = dma_alloc_wc(host, size,
 554                                                        &job->gather_copy,
 555                                                        GFP_KERNEL);
 556         if (!job->gather_copy_mapped)
 557                 return -ENOMEM;
 558
 559         job->gather_copy_size = size;
 560
 561         for (i = 0; i < job->num_gathers; i++) {
 562                 struct host1x_job_gather *g = &job->gathers[i];
 563                 void *gather;
 564
 565                 /* Copy the gather */
 566                 gather = host1x_bo_mmap(g->bo);
 567                 memcpy(job->gather_copy_mapped + offset, gather + g->offset,
 568                        g->words * sizeof(u32));
 569                 host1x_bo_munmap(g->bo, gather);
 570
 571                 /* Store the location in the buffer */
 572                 g->base = job->gather_copy;
 573                 g->offset = offset;
 574
 575                 /* Validate the job */
 576                 if (validate(&fw, g))
 577                         return -EINVAL;
 578
 579                 offset += g->words * sizeof(u32);
 580         }
 581
 582         /* No relocs should remain at this point */
 583         if (fw.num_relocs)
 584                 return -EINVAL;
 585
 586         return 0;
 587 }
 588
 589 int host1x_job_pin(struct host1x_job *job, struct device *dev)
 590 {
 591         int err;
 592         unsigned int i, j;
 593         struct host1x *host = dev_get_drvdata(dev->parent);
 594
 595         /* pin memory */
 596         err = pin_job(host, job);
 597         if (err)
 598                 goto out;
 599
 600         if (IS_ENABLED(CONFIG_TEGRA_HOST1X_FIREWALL)) {
 601                 err = copy_gathers(host->dev, job, dev);
 602                 if (err)
 603                         goto out;
 604         }
 605
 606         /* patch gathers */
 607         for (i = 0; i < job->num_gathers; i++) {
 608                 struct host1x_job_gather *g = &job->gathers[i];
 609
 610                 /* process each gather mem only once */
 611                 if (g->handled)
 612                         continue;
 613
 614                 /* copy_gathers() sets gathers base if firewall is enabled */
 615                 if (!IS_ENABLED(CONFIG_TEGRA_HOST1X_FIREWALL))
 616                         g->base = job->gather_addr_phys[i];
 617
 618                 for (j = i + 1; j < job->num_gathers; j++) {
 619                         if (job->gathers[j].bo == g->bo) {
 620                                 job->gathers[j].handled = true;
 621                                 job->gathers[j].base = g->base;
 622                         }
 623                 }
 624
 625                 err = do_relocs(job, g);
 626                 if (err)
 627                         break;
 628         }
 629
 630 out:
 631         if (err)
 632                 host1x_job_unpin(job);
 633         wmb();
 634
 635         return err;
 636 }
 637 EXPORT_SYMBOL(host1x_job_pin);
 638
 639 void host1x_job_unpin(struct host1x_job *job)
 640 {
 641         struct host1x *host = dev_get_drvdata(job->channel->dev->parent);
 642         unsigned int i;
 643
 644         for (i = 0; i < job->num_unpins; i++) {
 645                 struct host1x_job_unpin_data *unpin = &job->unpins[i];
 646                 struct device *dev = unpin->dev ?: host->dev;
 647                 struct sg_table *sgt = unpin->sgt;
 648
 649                 if (!IS_ENABLED(CONFIG_TEGRA_HOST1X_FIREWALL) &&
 650                     unpin->size && host->domain) {
 651                         iommu_unmap(host->domain, job->addr_phys[i],
 652                                     unpin->size);
 653                         free_iova(&host->iova,
 654                                 iova_pfn(&host->iova, job->addr_phys[i]));
 655                 }
 656
 657                 if (unpin->dev && sgt)
 658                         dma_unmap_sgtable(unpin->dev, sgt, unpin->dir, 0);
 659
 660                 host1x_bo_unpin(dev, unpin->bo, sgt);
 661                 host1x_bo_put(unpin->bo);
 662         }
 663
 664         job->num_unpins = 0;
 665
 666         if (job->gather_copy_size)
 667                 dma_free_wc(host->dev, job->gather_copy_size,
 668                             job->gather_copy_mapped, job->gather_copy);
 669 }
 670 EXPORT_SYMBOL(host1x_job_unpin);
 671
 672 /*
 673  * Debug routine used to dump job entries
 674  */
 675 void host1x_job_dump(struct device *dev, struct host1x_job *job)
 676 {
 677         dev_dbg(dev, "    SYNCPT_ID   %d\n", job->syncpt_id);
 678         dev_dbg(dev, "    SYNCPT_VAL  %d\n", job->syncpt_end);
 679         dev_dbg(dev, "    FIRST_GET   0x%x\n", job->first_get);
 680         dev_dbg(dev, "    TIMEOUT     %d\n", job->timeout);
 681         dev_dbg(dev, "    NUM_SLOTS   %d\n", job->num_slots);
 682         dev_dbg(dev, "    NUM_HANDLES %d\n", job->num_unpins);
 683 }