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 26struct 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} 69EXPORT_SYMBOL(host1x_job_alloc); 70 71struct host1x_job *host1x_job_get(struct host1x_job *job) 72{ 73 kref_get(&job->ref); 74 return job; 75} 76EXPORT_SYMBOL(host1x_job_get); 77 78static 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 85void host1x_job_put(struct host1x_job *job) 86{ 87 kref_put(&job->ref, job_free); 88} 89EXPORT_SYMBOL(host1x_job_put); 90 91void 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} 102EXPORT_SYMBOL(host1x_job_add_gather); 103 104static 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 272put: 273 host1x_bo_put(g->bo); 274unpin: 275 host1x_job_unpin(job); 276 return err; 277} 278 279static 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; 313patch_reloc: 314 *target = reloc_addr; 315 } 316 317 if (cmdbuf_addr) 318 host1x_bo_munmap(cmdbuf, cmdbuf_addr); 319 320 return 0; 321} 322 323static 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 338struct 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 355static 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 374static 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 387static 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 412static 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 435static 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 456static 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 520out: 521 return err; 522} 523 524static 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 589int 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 630out: 631 if (err) 632 host1x_job_unpin(job); 633 wmb(); 634 635 return err; 636} 637EXPORT_SYMBOL(host1x_job_pin); 638 639void 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} 670EXPORT_SYMBOL(host1x_job_unpin); 671 672/* 673 * Debug routine used to dump job entries 674 */ 675void 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} 684