1 /* 2 * Copyright 2018 Red Hat Inc. 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 shall be included in 12 * all copies or substantial portions of the Software. 13 * 14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 15 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 16 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 17 * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR 18 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, 19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR 20 * OTHER DEALINGS IN THE SOFTWARE. 21 */ 22 #include "nouveau_svm.h" 23 #include "nouveau_drv.h" 24 #include "nouveau_chan.h" 25 #include "nouveau_dmem.h" 26 27 #include <nvif/notify.h> 28 #include <nvif/object.h> 29 #include <nvif/vmm.h> 30 31 #include <nvif/class.h> 32 #include <nvif/clb069.h> 33 #include <nvif/ifc00d.h> 34 35 #include <linux/sched/mm.h> 36 #include <linux/sort.h> 37 #include <linux/hmm.h> 38 39 struct nouveau_svm { 40 struct nouveau_drm *drm; 41 struct mutex mutex; 42 struct list_head inst; 43 44 struct nouveau_svm_fault_buffer { 45 int id; 46 struct nvif_object object; 47 u32 entries; 48 u32 getaddr; 49 u32 putaddr; 50 u32 get; 51 u32 put; 52 struct nvif_notify notify; 53 54 struct nouveau_svm_fault { 55 u64 inst; 56 u64 addr; 57 u64 time; 58 u32 engine; 59 u8 gpc; 60 u8 hub; 61 u8 access; 62 u8 client; 63 u8 fault; 64 struct nouveau_svmm *svmm; 65 } **fault; 66 int fault_nr; 67 } buffer[1]; 68 }; 69 70 #define SVM_DBG(s,f,a...) NV_DEBUG((s)->drm, "svm: "f"\n", ##a) 71 #define SVM_ERR(s,f,a...) NV_WARN((s)->drm, "svm: "f"\n", ##a) 72 73 struct nouveau_pfnmap_args { 74 struct nvif_ioctl_v0 i; 75 struct nvif_ioctl_mthd_v0 m; 76 struct nvif_vmm_pfnmap_v0 p; 77 }; 78 79 struct nouveau_ivmm { 80 struct nouveau_svmm *svmm; 81 u64 inst; 82 struct list_head head; 83 }; 84 85 static struct nouveau_ivmm * 86 nouveau_ivmm_find(struct nouveau_svm *svm, u64 inst) 87 { 88 struct nouveau_ivmm *ivmm; 89 list_for_each_entry(ivmm, &svm->inst, head) { 90 if (ivmm->inst == inst) 91 return ivmm; 92 } 93 return NULL; 94 } 95 96 #define SVMM_DBG(s,f,a...) \ 97 NV_DEBUG((s)->vmm->cli->drm, "svm-%p: "f"\n", (s), ##a) 98 #define SVMM_ERR(s,f,a...) \ 99 NV_WARN((s)->vmm->cli->drm, "svm-%p: "f"\n", (s), ##a) 100 101 int 102 nouveau_svmm_bind(struct drm_device *dev, void *data, 103 struct drm_file *file_priv) 104 { 105 struct nouveau_cli *cli = nouveau_cli(file_priv); 106 struct drm_nouveau_svm_bind *args = data; 107 unsigned target, cmd, priority; 108 unsigned long addr, end; 109 struct mm_struct *mm; 110 111 args->va_start &= PAGE_MASK; 112 args->va_end = ALIGN(args->va_end, PAGE_SIZE); 113 114 /* Sanity check arguments */ 115 if (args->reserved0 || args->reserved1) 116 return -EINVAL; 117 if (args->header & (~NOUVEAU_SVM_BIND_VALID_MASK)) 118 return -EINVAL; 119 if (args->va_start >= args->va_end) 120 return -EINVAL; 121 122 cmd = args->header >> NOUVEAU_SVM_BIND_COMMAND_SHIFT; 123 cmd &= NOUVEAU_SVM_BIND_COMMAND_MASK; 124 switch (cmd) { 125 case NOUVEAU_SVM_BIND_COMMAND__MIGRATE: 126 break; 127 default: 128 return -EINVAL; 129 } 130 131 priority = args->header >> NOUVEAU_SVM_BIND_PRIORITY_SHIFT; 132 priority &= NOUVEAU_SVM_BIND_PRIORITY_MASK; 133 134 /* FIXME support CPU target ie all target value < GPU_VRAM */ 135 target = args->header >> NOUVEAU_SVM_BIND_TARGET_SHIFT; 136 target &= NOUVEAU_SVM_BIND_TARGET_MASK; 137 switch (target) { 138 case NOUVEAU_SVM_BIND_TARGET__GPU_VRAM: 139 break; 140 default: 141 return -EINVAL; 142 } 143 144 /* 145 * FIXME: For now refuse non 0 stride, we need to change the migrate 146 * kernel function to handle stride to avoid to create a mess within 147 * each device driver. 148 */ 149 if (args->stride) 150 return -EINVAL; 151 152 /* 153 * Ok we are ask to do something sane, for now we only support migrate 154 * commands but we will add things like memory policy (what to do on 155 * page fault) and maybe some other commands. 156 */ 157 158 mm = get_task_mm(current); 159 mmap_read_lock(mm); 160 161 if (!cli->svm.svmm) { 162 mmap_read_unlock(mm); 163 return -EINVAL; 164 } 165 166 for (addr = args->va_start, end = args->va_end; addr < end;) { 167 struct vm_area_struct *vma; 168 unsigned long next; 169 170 vma = find_vma_intersection(mm, addr, end); 171 if (!vma) 172 break; 173 174 addr = max(addr, vma->vm_start); 175 next = min(vma->vm_end, end); 176 /* This is a best effort so we ignore errors */ 177 nouveau_dmem_migrate_vma(cli->drm, cli->svm.svmm, vma, addr, 178 next); 179 addr = next; 180 } 181 182 /* 183 * FIXME Return the number of page we have migrated, again we need to 184 * update the migrate API to return that information so that we can 185 * report it to user space. 186 */ 187 args->result = 0; 188 189 mmap_read_unlock(mm); 190 mmput(mm); 191 192 return 0; 193 } 194 195 /* Unlink channel instance from SVMM. */ 196 void 197 nouveau_svmm_part(struct nouveau_svmm *svmm, u64 inst) 198 { 199 struct nouveau_ivmm *ivmm; 200 if (svmm) { 201 mutex_lock(&svmm->vmm->cli->drm->svm->mutex); 202 ivmm = nouveau_ivmm_find(svmm->vmm->cli->drm->svm, inst); 203 if (ivmm) { 204 list_del(&ivmm->head); 205 kfree(ivmm); 206 } 207 mutex_unlock(&svmm->vmm->cli->drm->svm->mutex); 208 } 209 } 210 211 /* Link channel instance to SVMM. */ 212 int 213 nouveau_svmm_join(struct nouveau_svmm *svmm, u64 inst) 214 { 215 struct nouveau_ivmm *ivmm; 216 if (svmm) { 217 if (!(ivmm = kmalloc(sizeof(*ivmm), GFP_KERNEL))) 218 return -ENOMEM; 219 ivmm->svmm = svmm; 220 ivmm->inst = inst; 221 222 mutex_lock(&svmm->vmm->cli->drm->svm->mutex); 223 list_add(&ivmm->head, &svmm->vmm->cli->drm->svm->inst); 224 mutex_unlock(&svmm->vmm->cli->drm->svm->mutex); 225 } 226 return 0; 227 } 228 229 /* Invalidate SVMM address-range on GPU. */ 230 void 231 nouveau_svmm_invalidate(struct nouveau_svmm *svmm, u64 start, u64 limit) 232 { 233 if (limit > start) { 234 bool super = svmm->vmm->vmm.object.client->super; 235 svmm->vmm->vmm.object.client->super = true; 236 nvif_object_mthd(&svmm->vmm->vmm.object, NVIF_VMM_V0_PFNCLR, 237 &(struct nvif_vmm_pfnclr_v0) { 238 .addr = start, 239 .size = limit - start, 240 }, sizeof(struct nvif_vmm_pfnclr_v0)); 241 svmm->vmm->vmm.object.client->super = super; 242 } 243 } 244 245 static int 246 nouveau_svmm_invalidate_range_start(struct mmu_notifier *mn, 247 const struct mmu_notifier_range *update) 248 { 249 struct nouveau_svmm *svmm = 250 container_of(mn, struct nouveau_svmm, notifier); 251 unsigned long start = update->start; 252 unsigned long limit = update->end; 253 254 if (!mmu_notifier_range_blockable(update)) 255 return -EAGAIN; 256 257 SVMM_DBG(svmm, "invalidate %016lx-%016lx", start, limit); 258 259 mutex_lock(&svmm->mutex); 260 if (unlikely(!svmm->vmm)) 261 goto out; 262 263 /* 264 * Ignore invalidation callbacks for device private pages since 265 * the invalidation is handled as part of the migration process. 266 */ 267 if (update->event == MMU_NOTIFY_MIGRATE && 268 update->migrate_pgmap_owner == svmm->vmm->cli->drm->dev) 269 goto out; 270 271 if (limit > svmm->unmanaged.start && start < svmm->unmanaged.limit) { 272 if (start < svmm->unmanaged.start) { 273 nouveau_svmm_invalidate(svmm, start, 274 svmm->unmanaged.limit); 275 } 276 start = svmm->unmanaged.limit; 277 } 278 279 nouveau_svmm_invalidate(svmm, start, limit); 280 281 out: 282 mutex_unlock(&svmm->mutex); 283 return 0; 284 } 285 286 static void nouveau_svmm_free_notifier(struct mmu_notifier *mn) 287 { 288 kfree(container_of(mn, struct nouveau_svmm, notifier)); 289 } 290 291 static const struct mmu_notifier_ops nouveau_mn_ops = { 292 .invalidate_range_start = nouveau_svmm_invalidate_range_start, 293 .free_notifier = nouveau_svmm_free_notifier, 294 }; 295 296 void 297 nouveau_svmm_fini(struct nouveau_svmm **psvmm) 298 { 299 struct nouveau_svmm *svmm = *psvmm; 300 if (svmm) { 301 mutex_lock(&svmm->mutex); 302 svmm->vmm = NULL; 303 mutex_unlock(&svmm->mutex); 304 mmu_notifier_put(&svmm->notifier); 305 *psvmm = NULL; 306 } 307 } 308 309 int 310 nouveau_svmm_init(struct drm_device *dev, void *data, 311 struct drm_file *file_priv) 312 { 313 struct nouveau_cli *cli = nouveau_cli(file_priv); 314 struct nouveau_svmm *svmm; 315 struct drm_nouveau_svm_init *args = data; 316 int ret; 317 318 /* Allocate tracking for SVM-enabled VMM. */ 319 if (!(svmm = kzalloc(sizeof(*svmm), GFP_KERNEL))) 320 return -ENOMEM; 321 svmm->vmm = &cli->svm; 322 svmm->unmanaged.start = args->unmanaged_addr; 323 svmm->unmanaged.limit = args->unmanaged_addr + args->unmanaged_size; 324 mutex_init(&svmm->mutex); 325 326 /* Check that SVM isn't already enabled for the client. */ 327 mutex_lock(&cli->mutex); 328 if (cli->svm.cli) { 329 ret = -EBUSY; 330 goto out_free; 331 } 332 333 /* Allocate a new GPU VMM that can support SVM (managed by the 334 * client, with replayable faults enabled). 335 * 336 * All future channel/memory allocations will make use of this 337 * VMM instead of the standard one. 338 */ 339 ret = nvif_vmm_ctor(&cli->mmu, "svmVmm", 340 cli->vmm.vmm.object.oclass, true, 341 args->unmanaged_addr, args->unmanaged_size, 342 &(struct gp100_vmm_v0) { 343 .fault_replay = true, 344 }, sizeof(struct gp100_vmm_v0), &cli->svm.vmm); 345 if (ret) 346 goto out_free; 347 348 mmap_write_lock(current->mm); 349 svmm->notifier.ops = &nouveau_mn_ops; 350 ret = __mmu_notifier_register(&svmm->notifier, current->mm); 351 if (ret) 352 goto out_mm_unlock; 353 /* Note, ownership of svmm transfers to mmu_notifier */ 354 355 cli->svm.svmm = svmm; 356 cli->svm.cli = cli; 357 mmap_write_unlock(current->mm); 358 mutex_unlock(&cli->mutex); 359 return 0; 360 361 out_mm_unlock: 362 mmap_write_unlock(current->mm); 363 out_free: 364 mutex_unlock(&cli->mutex); 365 kfree(svmm); 366 return ret; 367 } 368 369 /* Issue fault replay for GPU to retry accesses that faulted previously. */ 370 static void 371 nouveau_svm_fault_replay(struct nouveau_svm *svm) 372 { 373 SVM_DBG(svm, "replay"); 374 WARN_ON(nvif_object_mthd(&svm->drm->client.vmm.vmm.object, 375 GP100_VMM_VN_FAULT_REPLAY, 376 &(struct gp100_vmm_fault_replay_vn) {}, 377 sizeof(struct gp100_vmm_fault_replay_vn))); 378 } 379 380 /* Cancel a replayable fault that could not be handled. 381 * 382 * Cancelling the fault will trigger recovery to reset the engine 383 * and kill the offending channel (ie. GPU SIGSEGV). 384 */ 385 static void 386 nouveau_svm_fault_cancel(struct nouveau_svm *svm, 387 u64 inst, u8 hub, u8 gpc, u8 client) 388 { 389 SVM_DBG(svm, "cancel %016llx %d %02x %02x", inst, hub, gpc, client); 390 WARN_ON(nvif_object_mthd(&svm->drm->client.vmm.vmm.object, 391 GP100_VMM_VN_FAULT_CANCEL, 392 &(struct gp100_vmm_fault_cancel_v0) { 393 .hub = hub, 394 .gpc = gpc, 395 .client = client, 396 .inst = inst, 397 }, sizeof(struct gp100_vmm_fault_cancel_v0))); 398 } 399 400 static void 401 nouveau_svm_fault_cancel_fault(struct nouveau_svm *svm, 402 struct nouveau_svm_fault *fault) 403 { 404 nouveau_svm_fault_cancel(svm, fault->inst, 405 fault->hub, 406 fault->gpc, 407 fault->client); 408 } 409 410 static int 411 nouveau_svm_fault_cmp(const void *a, const void *b) 412 { 413 const struct nouveau_svm_fault *fa = *(struct nouveau_svm_fault **)a; 414 const struct nouveau_svm_fault *fb = *(struct nouveau_svm_fault **)b; 415 int ret; 416 if ((ret = (s64)fa->inst - fb->inst)) 417 return ret; 418 if ((ret = (s64)fa->addr - fb->addr)) 419 return ret; 420 /*XXX: atomic? */ 421 return (fa->access == 0 || fa->access == 3) - 422 (fb->access == 0 || fb->access == 3); 423 } 424 425 static void 426 nouveau_svm_fault_cache(struct nouveau_svm *svm, 427 struct nouveau_svm_fault_buffer *buffer, u32 offset) 428 { 429 struct nvif_object *memory = &buffer->object; 430 const u32 instlo = nvif_rd32(memory, offset + 0x00); 431 const u32 insthi = nvif_rd32(memory, offset + 0x04); 432 const u32 addrlo = nvif_rd32(memory, offset + 0x08); 433 const u32 addrhi = nvif_rd32(memory, offset + 0x0c); 434 const u32 timelo = nvif_rd32(memory, offset + 0x10); 435 const u32 timehi = nvif_rd32(memory, offset + 0x14); 436 const u32 engine = nvif_rd32(memory, offset + 0x18); 437 const u32 info = nvif_rd32(memory, offset + 0x1c); 438 const u64 inst = (u64)insthi << 32 | instlo; 439 const u8 gpc = (info & 0x1f000000) >> 24; 440 const u8 hub = (info & 0x00100000) >> 20; 441 const u8 client = (info & 0x00007f00) >> 8; 442 struct nouveau_svm_fault *fault; 443 444 //XXX: i think we're supposed to spin waiting */ 445 if (WARN_ON(!(info & 0x80000000))) 446 return; 447 448 nvif_mask(memory, offset + 0x1c, 0x80000000, 0x00000000); 449 450 if (!buffer->fault[buffer->fault_nr]) { 451 fault = kmalloc(sizeof(*fault), GFP_KERNEL); 452 if (WARN_ON(!fault)) { 453 nouveau_svm_fault_cancel(svm, inst, hub, gpc, client); 454 return; 455 } 456 buffer->fault[buffer->fault_nr] = fault; 457 } 458 459 fault = buffer->fault[buffer->fault_nr++]; 460 fault->inst = inst; 461 fault->addr = (u64)addrhi << 32 | addrlo; 462 fault->time = (u64)timehi << 32 | timelo; 463 fault->engine = engine; 464 fault->gpc = gpc; 465 fault->hub = hub; 466 fault->access = (info & 0x000f0000) >> 16; 467 fault->client = client; 468 fault->fault = (info & 0x0000001f); 469 470 SVM_DBG(svm, "fault %016llx %016llx %02x", 471 fault->inst, fault->addr, fault->access); 472 } 473 474 struct svm_notifier { 475 struct mmu_interval_notifier notifier; 476 struct nouveau_svmm *svmm; 477 }; 478 479 static bool nouveau_svm_range_invalidate(struct mmu_interval_notifier *mni, 480 const struct mmu_notifier_range *range, 481 unsigned long cur_seq) 482 { 483 struct svm_notifier *sn = 484 container_of(mni, struct svm_notifier, notifier); 485 486 /* 487 * serializes the update to mni->invalidate_seq done by caller and 488 * prevents invalidation of the PTE from progressing while HW is being 489 * programmed. This is very hacky and only works because the normal 490 * notifier that does invalidation is always called after the range 491 * notifier. 492 */ 493 if (mmu_notifier_range_blockable(range)) 494 mutex_lock(&sn->svmm->mutex); 495 else if (!mutex_trylock(&sn->svmm->mutex)) 496 return false; 497 mmu_interval_set_seq(mni, cur_seq); 498 mutex_unlock(&sn->svmm->mutex); 499 return true; 500 } 501 502 static const struct mmu_interval_notifier_ops nouveau_svm_mni_ops = { 503 .invalidate = nouveau_svm_range_invalidate, 504 }; 505 506 static void nouveau_hmm_convert_pfn(struct nouveau_drm *drm, 507 struct hmm_range *range, 508 struct nouveau_pfnmap_args *args) 509 { 510 struct page *page; 511 512 /* 513 * The address prepared here is passed through nvif_object_ioctl() 514 * to an eventual DMA map in something like gp100_vmm_pgt_pfn() 515 * 516 * This is all just encoding the internal hmm representation into a 517 * different nouveau internal representation. 518 */ 519 if (!(range->hmm_pfns[0] & HMM_PFN_VALID)) { 520 args->p.phys[0] = 0; 521 return; 522 } 523 524 page = hmm_pfn_to_page(range->hmm_pfns[0]); 525 /* 526 * Only map compound pages to the GPU if the CPU is also mapping the 527 * page as a compound page. Otherwise, the PTE protections might not be 528 * consistent (e.g., CPU only maps part of a compound page). 529 * Note that the underlying page might still be larger than the 530 * CPU mapping (e.g., a PUD sized compound page partially mapped with 531 * a PMD sized page table entry). 532 */ 533 if (hmm_pfn_to_map_order(range->hmm_pfns[0])) { 534 unsigned long addr = args->p.addr; 535 536 args->p.page = hmm_pfn_to_map_order(range->hmm_pfns[0]) + 537 PAGE_SHIFT; 538 args->p.size = 1UL << args->p.page; 539 args->p.addr &= ~(args->p.size - 1); 540 page -= (addr - args->p.addr) >> PAGE_SHIFT; 541 } 542 if (is_device_private_page(page)) 543 args->p.phys[0] = nouveau_dmem_page_addr(page) | 544 NVIF_VMM_PFNMAP_V0_V | 545 NVIF_VMM_PFNMAP_V0_VRAM; 546 else 547 args->p.phys[0] = page_to_phys(page) | 548 NVIF_VMM_PFNMAP_V0_V | 549 NVIF_VMM_PFNMAP_V0_HOST; 550 if (range->hmm_pfns[0] & HMM_PFN_WRITE) 551 args->p.phys[0] |= NVIF_VMM_PFNMAP_V0_W; 552 } 553 554 static int nouveau_range_fault(struct nouveau_svmm *svmm, 555 struct nouveau_drm *drm, 556 struct nouveau_pfnmap_args *args, u32 size, 557 unsigned long hmm_flags, 558 struct svm_notifier *notifier) 559 { 560 unsigned long timeout = 561 jiffies + msecs_to_jiffies(HMM_RANGE_DEFAULT_TIMEOUT); 562 /* Have HMM fault pages within the fault window to the GPU. */ 563 unsigned long hmm_pfns[1]; 564 struct hmm_range range = { 565 .notifier = ¬ifier->notifier, 566 .start = notifier->notifier.interval_tree.start, 567 .end = notifier->notifier.interval_tree.last + 1, 568 .default_flags = hmm_flags, 569 .hmm_pfns = hmm_pfns, 570 .dev_private_owner = drm->dev, 571 }; 572 struct mm_struct *mm = notifier->notifier.mm; 573 int ret; 574 575 while (true) { 576 if (time_after(jiffies, timeout)) 577 return -EBUSY; 578 579 range.notifier_seq = mmu_interval_read_begin(range.notifier); 580 mmap_read_lock(mm); 581 ret = hmm_range_fault(&range); 582 mmap_read_unlock(mm); 583 if (ret) { 584 if (ret == -EBUSY) 585 continue; 586 return ret; 587 } 588 589 mutex_lock(&svmm->mutex); 590 if (mmu_interval_read_retry(range.notifier, 591 range.notifier_seq)) { 592 mutex_unlock(&svmm->mutex); 593 continue; 594 } 595 break; 596 } 597 598 nouveau_hmm_convert_pfn(drm, &range, args); 599 600 svmm->vmm->vmm.object.client->super = true; 601 ret = nvif_object_ioctl(&svmm->vmm->vmm.object, args, size, NULL); 602 svmm->vmm->vmm.object.client->super = false; 603 mutex_unlock(&svmm->mutex); 604 605 return ret; 606 } 607 608 static int 609 nouveau_svm_fault(struct nvif_notify *notify) 610 { 611 struct nouveau_svm_fault_buffer *buffer = 612 container_of(notify, typeof(*buffer), notify); 613 struct nouveau_svm *svm = 614 container_of(buffer, typeof(*svm), buffer[buffer->id]); 615 struct nvif_object *device = &svm->drm->client.device.object; 616 struct nouveau_svmm *svmm; 617 struct { 618 struct nouveau_pfnmap_args i; 619 u64 phys[1]; 620 } args; 621 unsigned long hmm_flags; 622 u64 inst, start, limit; 623 int fi, fn; 624 int replay = 0, ret; 625 626 /* Parse available fault buffer entries into a cache, and update 627 * the GET pointer so HW can reuse the entries. 628 */ 629 SVM_DBG(svm, "fault handler"); 630 if (buffer->get == buffer->put) { 631 buffer->put = nvif_rd32(device, buffer->putaddr); 632 buffer->get = nvif_rd32(device, buffer->getaddr); 633 if (buffer->get == buffer->put) 634 return NVIF_NOTIFY_KEEP; 635 } 636 buffer->fault_nr = 0; 637 638 SVM_DBG(svm, "get %08x put %08x", buffer->get, buffer->put); 639 while (buffer->get != buffer->put) { 640 nouveau_svm_fault_cache(svm, buffer, buffer->get * 0x20); 641 if (++buffer->get == buffer->entries) 642 buffer->get = 0; 643 } 644 nvif_wr32(device, buffer->getaddr, buffer->get); 645 SVM_DBG(svm, "%d fault(s) pending", buffer->fault_nr); 646 647 /* Sort parsed faults by instance pointer to prevent unnecessary 648 * instance to SVMM translations, followed by address and access 649 * type to reduce the amount of work when handling the faults. 650 */ 651 sort(buffer->fault, buffer->fault_nr, sizeof(*buffer->fault), 652 nouveau_svm_fault_cmp, NULL); 653 654 /* Lookup SVMM structure for each unique instance pointer. */ 655 mutex_lock(&svm->mutex); 656 for (fi = 0, svmm = NULL; fi < buffer->fault_nr; fi++) { 657 if (!svmm || buffer->fault[fi]->inst != inst) { 658 struct nouveau_ivmm *ivmm = 659 nouveau_ivmm_find(svm, buffer->fault[fi]->inst); 660 svmm = ivmm ? ivmm->svmm : NULL; 661 inst = buffer->fault[fi]->inst; 662 SVM_DBG(svm, "inst %016llx -> svm-%p", inst, svmm); 663 } 664 buffer->fault[fi]->svmm = svmm; 665 } 666 mutex_unlock(&svm->mutex); 667 668 /* Process list of faults. */ 669 args.i.i.version = 0; 670 args.i.i.type = NVIF_IOCTL_V0_MTHD; 671 args.i.m.version = 0; 672 args.i.m.method = NVIF_VMM_V0_PFNMAP; 673 args.i.p.version = 0; 674 675 for (fi = 0; fn = fi + 1, fi < buffer->fault_nr; fi = fn) { 676 struct svm_notifier notifier; 677 struct mm_struct *mm; 678 679 /* Cancel any faults from non-SVM channels. */ 680 if (!(svmm = buffer->fault[fi]->svmm)) { 681 nouveau_svm_fault_cancel_fault(svm, buffer->fault[fi]); 682 continue; 683 } 684 SVMM_DBG(svmm, "addr %016llx", buffer->fault[fi]->addr); 685 686 /* We try and group handling of faults within a small 687 * window into a single update. 688 */ 689 start = buffer->fault[fi]->addr; 690 limit = start + PAGE_SIZE; 691 if (start < svmm->unmanaged.limit) 692 limit = min_t(u64, limit, svmm->unmanaged.start); 693 694 /* 695 * Prepare the GPU-side update of all pages within the 696 * fault window, determining required pages and access 697 * permissions based on pending faults. 698 */ 699 args.i.p.addr = start; 700 args.i.p.page = PAGE_SHIFT; 701 args.i.p.size = PAGE_SIZE; 702 /* 703 * Determine required permissions based on GPU fault 704 * access flags. 705 * XXX: atomic? 706 */ 707 switch (buffer->fault[fi]->access) { 708 case 0: /* READ. */ 709 hmm_flags = HMM_PFN_REQ_FAULT; 710 break; 711 case 3: /* PREFETCH. */ 712 hmm_flags = 0; 713 break; 714 default: 715 hmm_flags = HMM_PFN_REQ_FAULT | HMM_PFN_REQ_WRITE; 716 break; 717 } 718 719 mm = svmm->notifier.mm; 720 if (!mmget_not_zero(mm)) { 721 nouveau_svm_fault_cancel_fault(svm, buffer->fault[fi]); 722 continue; 723 } 724 725 notifier.svmm = svmm; 726 ret = mmu_interval_notifier_insert(¬ifier.notifier, mm, 727 args.i.p.addr, args.i.p.size, 728 &nouveau_svm_mni_ops); 729 if (!ret) { 730 ret = nouveau_range_fault(svmm, svm->drm, &args.i, 731 sizeof(args), hmm_flags, ¬ifier); 732 mmu_interval_notifier_remove(¬ifier.notifier); 733 } 734 mmput(mm); 735 736 limit = args.i.p.addr + args.i.p.size; 737 for (fn = fi; ++fn < buffer->fault_nr; ) { 738 /* It's okay to skip over duplicate addresses from the 739 * same SVMM as faults are ordered by access type such 740 * that only the first one needs to be handled. 741 * 742 * ie. WRITE faults appear first, thus any handling of 743 * pending READ faults will already be satisfied. 744 * But if a large page is mapped, make sure subsequent 745 * fault addresses have sufficient access permission. 746 */ 747 if (buffer->fault[fn]->svmm != svmm || 748 buffer->fault[fn]->addr >= limit || 749 (buffer->fault[fi]->access == 0 /* READ. */ && 750 !(args.phys[0] & NVIF_VMM_PFNMAP_V0_V)) || 751 (buffer->fault[fi]->access != 0 /* READ. */ && 752 buffer->fault[fi]->access != 3 /* PREFETCH. */ && 753 !(args.phys[0] & NVIF_VMM_PFNMAP_V0_W))) 754 break; 755 } 756 757 /* If handling failed completely, cancel all faults. */ 758 if (ret) { 759 while (fi < fn) { 760 struct nouveau_svm_fault *fault = 761 buffer->fault[fi++]; 762 763 nouveau_svm_fault_cancel_fault(svm, fault); 764 } 765 } else 766 replay++; 767 } 768 769 /* Issue fault replay to the GPU. */ 770 if (replay) 771 nouveau_svm_fault_replay(svm); 772 return NVIF_NOTIFY_KEEP; 773 } 774 775 static struct nouveau_pfnmap_args * 776 nouveau_pfns_to_args(void *pfns) 777 { 778 return container_of(pfns, struct nouveau_pfnmap_args, p.phys); 779 } 780 781 u64 * 782 nouveau_pfns_alloc(unsigned long npages) 783 { 784 struct nouveau_pfnmap_args *args; 785 786 args = kzalloc(struct_size(args, p.phys, npages), GFP_KERNEL); 787 if (!args) 788 return NULL; 789 790 args->i.type = NVIF_IOCTL_V0_MTHD; 791 args->m.method = NVIF_VMM_V0_PFNMAP; 792 args->p.page = PAGE_SHIFT; 793 794 return args->p.phys; 795 } 796 797 void 798 nouveau_pfns_free(u64 *pfns) 799 { 800 struct nouveau_pfnmap_args *args = nouveau_pfns_to_args(pfns); 801 802 kfree(args); 803 } 804 805 void 806 nouveau_pfns_map(struct nouveau_svmm *svmm, struct mm_struct *mm, 807 unsigned long addr, u64 *pfns, unsigned long npages) 808 { 809 struct nouveau_pfnmap_args *args = nouveau_pfns_to_args(pfns); 810 int ret; 811 812 args->p.addr = addr; 813 args->p.size = npages << PAGE_SHIFT; 814 815 mutex_lock(&svmm->mutex); 816 817 svmm->vmm->vmm.object.client->super = true; 818 ret = nvif_object_ioctl(&svmm->vmm->vmm.object, args, sizeof(*args) + 819 npages * sizeof(args->p.phys[0]), NULL); 820 svmm->vmm->vmm.object.client->super = false; 821 822 mutex_unlock(&svmm->mutex); 823 } 824 825 static void 826 nouveau_svm_fault_buffer_fini(struct nouveau_svm *svm, int id) 827 { 828 struct nouveau_svm_fault_buffer *buffer = &svm->buffer[id]; 829 nvif_notify_put(&buffer->notify); 830 } 831 832 static int 833 nouveau_svm_fault_buffer_init(struct nouveau_svm *svm, int id) 834 { 835 struct nouveau_svm_fault_buffer *buffer = &svm->buffer[id]; 836 struct nvif_object *device = &svm->drm->client.device.object; 837 buffer->get = nvif_rd32(device, buffer->getaddr); 838 buffer->put = nvif_rd32(device, buffer->putaddr); 839 SVM_DBG(svm, "get %08x put %08x (init)", buffer->get, buffer->put); 840 return nvif_notify_get(&buffer->notify); 841 } 842 843 static void 844 nouveau_svm_fault_buffer_dtor(struct nouveau_svm *svm, int id) 845 { 846 struct nouveau_svm_fault_buffer *buffer = &svm->buffer[id]; 847 int i; 848 849 if (buffer->fault) { 850 for (i = 0; buffer->fault[i] && i < buffer->entries; i++) 851 kfree(buffer->fault[i]); 852 kvfree(buffer->fault); 853 } 854 855 nouveau_svm_fault_buffer_fini(svm, id); 856 857 nvif_notify_dtor(&buffer->notify); 858 nvif_object_dtor(&buffer->object); 859 } 860 861 static int 862 nouveau_svm_fault_buffer_ctor(struct nouveau_svm *svm, s32 oclass, int id) 863 { 864 struct nouveau_svm_fault_buffer *buffer = &svm->buffer[id]; 865 struct nouveau_drm *drm = svm->drm; 866 struct nvif_object *device = &drm->client.device.object; 867 struct nvif_clb069_v0 args = {}; 868 int ret; 869 870 buffer->id = id; 871 872 ret = nvif_object_ctor(device, "svmFaultBuffer", 0, oclass, &args, 873 sizeof(args), &buffer->object); 874 if (ret < 0) { 875 SVM_ERR(svm, "Fault buffer allocation failed: %d", ret); 876 return ret; 877 } 878 879 nvif_object_map(&buffer->object, NULL, 0); 880 buffer->entries = args.entries; 881 buffer->getaddr = args.get; 882 buffer->putaddr = args.put; 883 884 ret = nvif_notify_ctor(&buffer->object, "svmFault", nouveau_svm_fault, 885 true, NVB069_V0_NTFY_FAULT, NULL, 0, 0, 886 &buffer->notify); 887 if (ret) 888 return ret; 889 890 buffer->fault = kvzalloc(sizeof(*buffer->fault) * buffer->entries, GFP_KERNEL); 891 if (!buffer->fault) 892 return -ENOMEM; 893 894 return nouveau_svm_fault_buffer_init(svm, id); 895 } 896 897 void 898 nouveau_svm_resume(struct nouveau_drm *drm) 899 { 900 struct nouveau_svm *svm = drm->svm; 901 if (svm) 902 nouveau_svm_fault_buffer_init(svm, 0); 903 } 904 905 void 906 nouveau_svm_suspend(struct nouveau_drm *drm) 907 { 908 struct nouveau_svm *svm = drm->svm; 909 if (svm) 910 nouveau_svm_fault_buffer_fini(svm, 0); 911 } 912 913 void 914 nouveau_svm_fini(struct nouveau_drm *drm) 915 { 916 struct nouveau_svm *svm = drm->svm; 917 if (svm) { 918 nouveau_svm_fault_buffer_dtor(svm, 0); 919 kfree(drm->svm); 920 drm->svm = NULL; 921 } 922 } 923 924 void 925 nouveau_svm_init(struct nouveau_drm *drm) 926 { 927 static const struct nvif_mclass buffers[] = { 928 { VOLTA_FAULT_BUFFER_A, 0 }, 929 { MAXWELL_FAULT_BUFFER_A, 0 }, 930 {} 931 }; 932 struct nouveau_svm *svm; 933 int ret; 934 935 /* Disable on Volta and newer until channel recovery is fixed, 936 * otherwise clients will have a trivial way to trash the GPU 937 * for everyone. 938 */ 939 if (drm->client.device.info.family > NV_DEVICE_INFO_V0_PASCAL) 940 return; 941 942 if (!(drm->svm = svm = kzalloc(sizeof(*drm->svm), GFP_KERNEL))) 943 return; 944 945 drm->svm->drm = drm; 946 mutex_init(&drm->svm->mutex); 947 INIT_LIST_HEAD(&drm->svm->inst); 948 949 ret = nvif_mclass(&drm->client.device.object, buffers); 950 if (ret < 0) { 951 SVM_DBG(svm, "No supported fault buffer class"); 952 nouveau_svm_fini(drm); 953 return; 954 } 955 956 ret = nouveau_svm_fault_buffer_ctor(svm, buffers[ret].oclass, 0); 957 if (ret) { 958 nouveau_svm_fini(drm); 959 return; 960 } 961 962 SVM_DBG(svm, "Initialised"); 963 } 964