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