1 /* 2 * Copyright (C) 2013 Red Hat 3 * Author: Rob Clark <robdclark@gmail.com> 4 * 5 * This program is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 as published by 7 * the Free Software Foundation. 8 * 9 * This program is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 12 * more details. 13 * 14 * You should have received a copy of the GNU General Public License along with 15 * this program. If not, see <http://www.gnu.org/licenses/>. 16 */ 17 18 #include <linux/spinlock.h> 19 #include <linux/shmem_fs.h> 20 #include <linux/dma-buf.h> 21 22 #include "msm_drv.h" 23 #include "msm_gem.h" 24 #include "msm_gpu.h" 25 26 27 /* called with dev->struct_mutex held */ 28 static struct page **get_pages(struct drm_gem_object *obj) 29 { 30 struct msm_gem_object *msm_obj = to_msm_bo(obj); 31 32 if (!msm_obj->pages) { 33 struct drm_device *dev = obj->dev; 34 struct page **p = drm_gem_get_pages(obj, 0); 35 int npages = obj->size >> PAGE_SHIFT; 36 37 if (IS_ERR(p)) { 38 dev_err(dev->dev, "could not get pages: %ld\n", 39 PTR_ERR(p)); 40 return p; 41 } 42 43 msm_obj->sgt = drm_prime_pages_to_sg(p, npages); 44 if (IS_ERR(msm_obj->sgt)) { 45 dev_err(dev->dev, "failed to allocate sgt\n"); 46 return ERR_CAST(msm_obj->sgt); 47 } 48 49 msm_obj->pages = p; 50 51 /* For non-cached buffers, ensure the new pages are clean 52 * because display controller, GPU, etc. are not coherent: 53 */ 54 if (msm_obj->flags & (MSM_BO_WC|MSM_BO_UNCACHED)) 55 dma_map_sg(dev->dev, msm_obj->sgt->sgl, 56 msm_obj->sgt->nents, DMA_BIDIRECTIONAL); 57 } 58 59 return msm_obj->pages; 60 } 61 62 static void put_pages(struct drm_gem_object *obj) 63 { 64 struct msm_gem_object *msm_obj = to_msm_bo(obj); 65 66 if (msm_obj->pages) { 67 /* For non-cached buffers, ensure the new pages are clean 68 * because display controller, GPU, etc. are not coherent: 69 */ 70 if (msm_obj->flags & (MSM_BO_WC|MSM_BO_UNCACHED)) 71 dma_unmap_sg(obj->dev->dev, msm_obj->sgt->sgl, 72 msm_obj->sgt->nents, DMA_BIDIRECTIONAL); 73 sg_free_table(msm_obj->sgt); 74 kfree(msm_obj->sgt); 75 76 drm_gem_put_pages(obj, msm_obj->pages, true, false); 77 msm_obj->pages = NULL; 78 } 79 } 80 81 struct page **msm_gem_get_pages(struct drm_gem_object *obj) 82 { 83 struct drm_device *dev = obj->dev; 84 struct page **p; 85 mutex_lock(&dev->struct_mutex); 86 p = get_pages(obj); 87 mutex_unlock(&dev->struct_mutex); 88 return p; 89 } 90 91 void msm_gem_put_pages(struct drm_gem_object *obj) 92 { 93 /* when we start tracking the pin count, then do something here */ 94 } 95 96 int msm_gem_mmap_obj(struct drm_gem_object *obj, 97 struct vm_area_struct *vma) 98 { 99 struct msm_gem_object *msm_obj = to_msm_bo(obj); 100 101 vma->vm_flags &= ~VM_PFNMAP; 102 vma->vm_flags |= VM_MIXEDMAP; 103 104 if (msm_obj->flags & MSM_BO_WC) { 105 vma->vm_page_prot = pgprot_writecombine(vm_get_page_prot(vma->vm_flags)); 106 } else if (msm_obj->flags & MSM_BO_UNCACHED) { 107 vma->vm_page_prot = pgprot_noncached(vm_get_page_prot(vma->vm_flags)); 108 } else { 109 /* 110 * Shunt off cached objs to shmem file so they have their own 111 * address_space (so unmap_mapping_range does what we want, 112 * in particular in the case of mmap'd dmabufs) 113 */ 114 fput(vma->vm_file); 115 get_file(obj->filp); 116 vma->vm_pgoff = 0; 117 vma->vm_file = obj->filp; 118 119 vma->vm_page_prot = vm_get_page_prot(vma->vm_flags); 120 } 121 122 return 0; 123 } 124 125 int msm_gem_mmap(struct file *filp, struct vm_area_struct *vma) 126 { 127 int ret; 128 129 ret = drm_gem_mmap(filp, vma); 130 if (ret) { 131 DBG("mmap failed: %d", ret); 132 return ret; 133 } 134 135 return msm_gem_mmap_obj(vma->vm_private_data, vma); 136 } 137 138 int msm_gem_fault(struct vm_area_struct *vma, struct vm_fault *vmf) 139 { 140 struct drm_gem_object *obj = vma->vm_private_data; 141 struct msm_gem_object *msm_obj = to_msm_bo(obj); 142 struct drm_device *dev = obj->dev; 143 struct page **pages; 144 unsigned long pfn; 145 pgoff_t pgoff; 146 int ret; 147 148 /* Make sure we don't parallel update on a fault, nor move or remove 149 * something from beneath our feet 150 */ 151 ret = mutex_lock_interruptible(&dev->struct_mutex); 152 if (ret) 153 goto out; 154 155 /* make sure we have pages attached now */ 156 pages = get_pages(obj); 157 if (IS_ERR(pages)) { 158 ret = PTR_ERR(pages); 159 goto out_unlock; 160 } 161 162 /* We don't use vmf->pgoff since that has the fake offset: */ 163 pgoff = ((unsigned long)vmf->virtual_address - 164 vma->vm_start) >> PAGE_SHIFT; 165 166 pfn = page_to_pfn(msm_obj->pages[pgoff]); 167 168 VERB("Inserting %p pfn %lx, pa %lx", vmf->virtual_address, 169 pfn, pfn << PAGE_SHIFT); 170 171 ret = vm_insert_mixed(vma, (unsigned long)vmf->virtual_address, pfn); 172 173 out_unlock: 174 mutex_unlock(&dev->struct_mutex); 175 out: 176 switch (ret) { 177 case -EAGAIN: 178 case 0: 179 case -ERESTARTSYS: 180 case -EINTR: 181 return VM_FAULT_NOPAGE; 182 case -ENOMEM: 183 return VM_FAULT_OOM; 184 default: 185 return VM_FAULT_SIGBUS; 186 } 187 } 188 189 /** get mmap offset */ 190 static uint64_t mmap_offset(struct drm_gem_object *obj) 191 { 192 struct drm_device *dev = obj->dev; 193 int ret; 194 195 WARN_ON(!mutex_is_locked(&dev->struct_mutex)); 196 197 /* Make it mmapable */ 198 ret = drm_gem_create_mmap_offset(obj); 199 200 if (ret) { 201 dev_err(dev->dev, "could not allocate mmap offset\n"); 202 return 0; 203 } 204 205 return drm_vma_node_offset_addr(&obj->vma_node); 206 } 207 208 uint64_t msm_gem_mmap_offset(struct drm_gem_object *obj) 209 { 210 uint64_t offset; 211 mutex_lock(&obj->dev->struct_mutex); 212 offset = mmap_offset(obj); 213 mutex_unlock(&obj->dev->struct_mutex); 214 return offset; 215 } 216 217 /* helpers for dealing w/ iommu: */ 218 static int map_range(struct iommu_domain *domain, unsigned int iova, 219 struct sg_table *sgt, unsigned int len, int prot) 220 { 221 struct scatterlist *sg; 222 unsigned int da = iova; 223 unsigned int i, j; 224 int ret; 225 226 if (!domain || !sgt) 227 return -EINVAL; 228 229 for_each_sg(sgt->sgl, sg, sgt->nents, i) { 230 u32 pa = sg_phys(sg) - sg->offset; 231 size_t bytes = sg->length + sg->offset; 232 233 VERB("map[%d]: %08x %08x(%x)", i, iova, pa, bytes); 234 235 ret = iommu_map(domain, da, pa, bytes, prot); 236 if (ret) 237 goto fail; 238 239 da += bytes; 240 } 241 242 return 0; 243 244 fail: 245 da = iova; 246 247 for_each_sg(sgt->sgl, sg, i, j) { 248 size_t bytes = sg->length + sg->offset; 249 iommu_unmap(domain, da, bytes); 250 da += bytes; 251 } 252 return ret; 253 } 254 255 static void unmap_range(struct iommu_domain *domain, unsigned int iova, 256 struct sg_table *sgt, unsigned int len) 257 { 258 struct scatterlist *sg; 259 unsigned int da = iova; 260 int i; 261 262 for_each_sg(sgt->sgl, sg, sgt->nents, i) { 263 size_t bytes = sg->length + sg->offset; 264 size_t unmapped; 265 266 unmapped = iommu_unmap(domain, da, bytes); 267 if (unmapped < bytes) 268 break; 269 270 VERB("unmap[%d]: %08x(%x)", i, iova, bytes); 271 272 BUG_ON(!IS_ALIGNED(bytes, PAGE_SIZE)); 273 274 da += bytes; 275 } 276 } 277 278 /* should be called under struct_mutex.. although it can be called 279 * from atomic context without struct_mutex to acquire an extra 280 * iova ref if you know one is already held. 281 * 282 * That means when I do eventually need to add support for unpinning 283 * the refcnt counter needs to be atomic_t. 284 */ 285 int msm_gem_get_iova_locked(struct drm_gem_object *obj, int id, 286 uint32_t *iova) 287 { 288 struct msm_gem_object *msm_obj = to_msm_bo(obj); 289 int ret = 0; 290 291 if (!msm_obj->domain[id].iova) { 292 struct msm_drm_private *priv = obj->dev->dev_private; 293 uint32_t offset = (uint32_t)mmap_offset(obj); 294 struct page **pages; 295 pages = get_pages(obj); 296 if (IS_ERR(pages)) 297 return PTR_ERR(pages); 298 // XXX ideally we would not map buffers writable when not needed... 299 ret = map_range(priv->iommus[id], offset, msm_obj->sgt, 300 obj->size, IOMMU_READ | IOMMU_WRITE); 301 msm_obj->domain[id].iova = offset; 302 } 303 304 if (!ret) 305 *iova = msm_obj->domain[id].iova; 306 307 return ret; 308 } 309 310 int msm_gem_get_iova(struct drm_gem_object *obj, int id, uint32_t *iova) 311 { 312 struct msm_gem_object *msm_obj = to_msm_bo(obj); 313 int ret; 314 315 /* this is safe right now because we don't unmap until the 316 * bo is deleted: 317 */ 318 if (msm_obj->domain[id].iova) { 319 *iova = msm_obj->domain[id].iova; 320 return 0; 321 } 322 323 mutex_lock(&obj->dev->struct_mutex); 324 ret = msm_gem_get_iova_locked(obj, id, iova); 325 mutex_unlock(&obj->dev->struct_mutex); 326 return ret; 327 } 328 329 void msm_gem_put_iova(struct drm_gem_object *obj, int id) 330 { 331 // XXX TODO .. 332 // NOTE: probably don't need a _locked() version.. we wouldn't 333 // normally unmap here, but instead just mark that it could be 334 // unmapped (if the iova refcnt drops to zero), but then later 335 // if another _get_iova_locked() fails we can start unmapping 336 // things that are no longer needed.. 337 } 338 339 int msm_gem_dumb_create(struct drm_file *file, struct drm_device *dev, 340 struct drm_mode_create_dumb *args) 341 { 342 args->pitch = align_pitch(args->width, args->bpp); 343 args->size = PAGE_ALIGN(args->pitch * args->height); 344 return msm_gem_new_handle(dev, file, args->size, 345 MSM_BO_SCANOUT | MSM_BO_WC, &args->handle); 346 } 347 348 int msm_gem_dumb_map_offset(struct drm_file *file, struct drm_device *dev, 349 uint32_t handle, uint64_t *offset) 350 { 351 struct drm_gem_object *obj; 352 int ret = 0; 353 354 /* GEM does all our handle to object mapping */ 355 obj = drm_gem_object_lookup(dev, file, handle); 356 if (obj == NULL) { 357 ret = -ENOENT; 358 goto fail; 359 } 360 361 *offset = msm_gem_mmap_offset(obj); 362 363 drm_gem_object_unreference_unlocked(obj); 364 365 fail: 366 return ret; 367 } 368 369 void *msm_gem_vaddr_locked(struct drm_gem_object *obj) 370 { 371 struct msm_gem_object *msm_obj = to_msm_bo(obj); 372 WARN_ON(!mutex_is_locked(&obj->dev->struct_mutex)); 373 if (!msm_obj->vaddr) { 374 struct page **pages = get_pages(obj); 375 if (IS_ERR(pages)) 376 return ERR_CAST(pages); 377 msm_obj->vaddr = vmap(pages, obj->size >> PAGE_SHIFT, 378 VM_MAP, pgprot_writecombine(PAGE_KERNEL)); 379 } 380 return msm_obj->vaddr; 381 } 382 383 void *msm_gem_vaddr(struct drm_gem_object *obj) 384 { 385 void *ret; 386 mutex_lock(&obj->dev->struct_mutex); 387 ret = msm_gem_vaddr_locked(obj); 388 mutex_unlock(&obj->dev->struct_mutex); 389 return ret; 390 } 391 392 /* setup callback for when bo is no longer busy.. 393 * TODO probably want to differentiate read vs write.. 394 */ 395 int msm_gem_queue_inactive_cb(struct drm_gem_object *obj, 396 struct msm_fence_cb *cb) 397 { 398 struct drm_device *dev = obj->dev; 399 struct msm_drm_private *priv = dev->dev_private; 400 struct msm_gem_object *msm_obj = to_msm_bo(obj); 401 int ret = 0; 402 403 mutex_lock(&dev->struct_mutex); 404 if (!list_empty(&cb->work.entry)) { 405 ret = -EINVAL; 406 } else if (is_active(msm_obj)) { 407 cb->fence = max(msm_obj->read_fence, msm_obj->write_fence); 408 list_add_tail(&cb->work.entry, &priv->fence_cbs); 409 } else { 410 queue_work(priv->wq, &cb->work); 411 } 412 mutex_unlock(&dev->struct_mutex); 413 414 return ret; 415 } 416 417 void msm_gem_move_to_active(struct drm_gem_object *obj, 418 struct msm_gpu *gpu, bool write, uint32_t fence) 419 { 420 struct msm_gem_object *msm_obj = to_msm_bo(obj); 421 msm_obj->gpu = gpu; 422 if (write) 423 msm_obj->write_fence = fence; 424 else 425 msm_obj->read_fence = fence; 426 list_del_init(&msm_obj->mm_list); 427 list_add_tail(&msm_obj->mm_list, &gpu->active_list); 428 } 429 430 void msm_gem_move_to_inactive(struct drm_gem_object *obj) 431 { 432 struct drm_device *dev = obj->dev; 433 struct msm_drm_private *priv = dev->dev_private; 434 struct msm_gem_object *msm_obj = to_msm_bo(obj); 435 436 WARN_ON(!mutex_is_locked(&dev->struct_mutex)); 437 438 msm_obj->gpu = NULL; 439 msm_obj->read_fence = 0; 440 msm_obj->write_fence = 0; 441 list_del_init(&msm_obj->mm_list); 442 list_add_tail(&msm_obj->mm_list, &priv->inactive_list); 443 } 444 445 int msm_gem_cpu_prep(struct drm_gem_object *obj, uint32_t op, 446 struct timespec *timeout) 447 { 448 struct drm_device *dev = obj->dev; 449 struct msm_gem_object *msm_obj = to_msm_bo(obj); 450 int ret = 0; 451 452 if (is_active(msm_obj)) { 453 uint32_t fence = 0; 454 455 if (op & MSM_PREP_READ) 456 fence = msm_obj->write_fence; 457 if (op & MSM_PREP_WRITE) 458 fence = max(fence, msm_obj->read_fence); 459 if (op & MSM_PREP_NOSYNC) 460 timeout = NULL; 461 462 ret = msm_wait_fence_interruptable(dev, fence, timeout); 463 } 464 465 /* TODO cache maintenance */ 466 467 return ret; 468 } 469 470 int msm_gem_cpu_fini(struct drm_gem_object *obj) 471 { 472 /* TODO cache maintenance */ 473 return 0; 474 } 475 476 #ifdef CONFIG_DEBUG_FS 477 void msm_gem_describe(struct drm_gem_object *obj, struct seq_file *m) 478 { 479 struct drm_device *dev = obj->dev; 480 struct msm_gem_object *msm_obj = to_msm_bo(obj); 481 uint64_t off = drm_vma_node_start(&obj->vma_node); 482 483 WARN_ON(!mutex_is_locked(&dev->struct_mutex)); 484 seq_printf(m, "%08x: %c(r=%u,w=%u) %2d (%2d) %08llx %p %d\n", 485 msm_obj->flags, is_active(msm_obj) ? 'A' : 'I', 486 msm_obj->read_fence, msm_obj->write_fence, 487 obj->name, obj->refcount.refcount.counter, 488 off, msm_obj->vaddr, obj->size); 489 } 490 491 void msm_gem_describe_objects(struct list_head *list, struct seq_file *m) 492 { 493 struct msm_gem_object *msm_obj; 494 int count = 0; 495 size_t size = 0; 496 497 list_for_each_entry(msm_obj, list, mm_list) { 498 struct drm_gem_object *obj = &msm_obj->base; 499 seq_printf(m, " "); 500 msm_gem_describe(obj, m); 501 count++; 502 size += obj->size; 503 } 504 505 seq_printf(m, "Total %d objects, %zu bytes\n", count, size); 506 } 507 #endif 508 509 void msm_gem_free_object(struct drm_gem_object *obj) 510 { 511 struct drm_device *dev = obj->dev; 512 struct msm_gem_object *msm_obj = to_msm_bo(obj); 513 int id; 514 515 WARN_ON(!mutex_is_locked(&dev->struct_mutex)); 516 517 /* object should not be on active list: */ 518 WARN_ON(is_active(msm_obj)); 519 520 list_del(&msm_obj->mm_list); 521 522 for (id = 0; id < ARRAY_SIZE(msm_obj->domain); id++) { 523 if (msm_obj->domain[id].iova) { 524 struct msm_drm_private *priv = obj->dev->dev_private; 525 uint32_t offset = (uint32_t)mmap_offset(obj); 526 unmap_range(priv->iommus[id], offset, 527 msm_obj->sgt, obj->size); 528 } 529 } 530 531 drm_gem_free_mmap_offset(obj); 532 533 if (obj->import_attach) { 534 if (msm_obj->vaddr) 535 dma_buf_vunmap(obj->import_attach->dmabuf, msm_obj->vaddr); 536 537 /* Don't drop the pages for imported dmabuf, as they are not 538 * ours, just free the array we allocated: 539 */ 540 if (msm_obj->pages) 541 drm_free_large(msm_obj->pages); 542 543 } else { 544 if (msm_obj->vaddr) 545 vunmap(msm_obj->vaddr); 546 put_pages(obj); 547 } 548 549 if (msm_obj->resv == &msm_obj->_resv) 550 reservation_object_fini(msm_obj->resv); 551 552 drm_gem_object_release(obj); 553 554 kfree(msm_obj); 555 } 556 557 /* convenience method to construct a GEM buffer object, and userspace handle */ 558 int msm_gem_new_handle(struct drm_device *dev, struct drm_file *file, 559 uint32_t size, uint32_t flags, uint32_t *handle) 560 { 561 struct drm_gem_object *obj; 562 int ret; 563 564 ret = mutex_lock_interruptible(&dev->struct_mutex); 565 if (ret) 566 return ret; 567 568 obj = msm_gem_new(dev, size, flags); 569 570 mutex_unlock(&dev->struct_mutex); 571 572 if (IS_ERR(obj)) 573 return PTR_ERR(obj); 574 575 ret = drm_gem_handle_create(file, obj, handle); 576 577 /* drop reference from allocate - handle holds it now */ 578 drm_gem_object_unreference_unlocked(obj); 579 580 return ret; 581 } 582 583 static int msm_gem_new_impl(struct drm_device *dev, 584 uint32_t size, uint32_t flags, 585 struct drm_gem_object **obj) 586 { 587 struct msm_drm_private *priv = dev->dev_private; 588 struct msm_gem_object *msm_obj; 589 590 switch (flags & MSM_BO_CACHE_MASK) { 591 case MSM_BO_UNCACHED: 592 case MSM_BO_CACHED: 593 case MSM_BO_WC: 594 break; 595 default: 596 dev_err(dev->dev, "invalid cache flag: %x\n", 597 (flags & MSM_BO_CACHE_MASK)); 598 return -EINVAL; 599 } 600 601 msm_obj = kzalloc(sizeof(*msm_obj), GFP_KERNEL); 602 if (!msm_obj) 603 return -ENOMEM; 604 605 msm_obj->flags = flags; 606 607 msm_obj->resv = &msm_obj->_resv; 608 reservation_object_init(msm_obj->resv); 609 610 INIT_LIST_HEAD(&msm_obj->submit_entry); 611 list_add_tail(&msm_obj->mm_list, &priv->inactive_list); 612 613 *obj = &msm_obj->base; 614 615 return 0; 616 } 617 618 struct drm_gem_object *msm_gem_new(struct drm_device *dev, 619 uint32_t size, uint32_t flags) 620 { 621 struct drm_gem_object *obj; 622 int ret; 623 624 WARN_ON(!mutex_is_locked(&dev->struct_mutex)); 625 626 size = PAGE_ALIGN(size); 627 628 ret = msm_gem_new_impl(dev, size, flags, &obj); 629 if (ret) 630 goto fail; 631 632 ret = drm_gem_object_init(dev, obj, size); 633 if (ret) 634 goto fail; 635 636 return obj; 637 638 fail: 639 if (obj) 640 drm_gem_object_unreference_unlocked(obj); 641 642 return ERR_PTR(ret); 643 } 644 645 struct drm_gem_object *msm_gem_import(struct drm_device *dev, 646 uint32_t size, struct sg_table *sgt) 647 { 648 struct msm_gem_object *msm_obj; 649 struct drm_gem_object *obj; 650 int ret, npages; 651 652 size = PAGE_ALIGN(size); 653 654 ret = msm_gem_new_impl(dev, size, MSM_BO_WC, &obj); 655 if (ret) 656 goto fail; 657 658 drm_gem_private_object_init(dev, obj, size); 659 660 npages = size / PAGE_SIZE; 661 662 msm_obj = to_msm_bo(obj); 663 msm_obj->sgt = sgt; 664 msm_obj->pages = drm_malloc_ab(npages, sizeof(struct page *)); 665 if (!msm_obj->pages) { 666 ret = -ENOMEM; 667 goto fail; 668 } 669 670 ret = drm_prime_sg_to_page_addr_arrays(sgt, msm_obj->pages, NULL, npages); 671 if (ret) 672 goto fail; 673 674 return obj; 675 676 fail: 677 if (obj) 678 drm_gem_object_unreference_unlocked(obj); 679 680 return ERR_PTR(ret); 681 } 682