1 /* exynos_drm_gem.c 2 * 3 * Copyright (c) 2011 Samsung Electronics Co., Ltd. 4 * Author: Inki Dae <inki.dae@samsung.com> 5 * 6 * This program is free software; you can redistribute it and/or modify it 7 * under the terms of the GNU General Public License as published by the 8 * Free Software Foundation; either version 2 of the License, or (at your 9 * option) any later version. 10 */ 11 12 #include <drm/drmP.h> 13 #include <drm/drm_vma_manager.h> 14 15 #include <linux/shmem_fs.h> 16 #include <linux/dma-buf.h> 17 #include <linux/pfn_t.h> 18 #include <drm/exynos_drm.h> 19 20 #include "exynos_drm_drv.h" 21 #include "exynos_drm_gem.h" 22 #include "exynos_drm_iommu.h" 23 24 static int exynos_drm_alloc_buf(struct exynos_drm_gem *exynos_gem) 25 { 26 struct drm_device *dev = exynos_gem->base.dev; 27 enum dma_attr attr; 28 unsigned int nr_pages; 29 struct sg_table sgt; 30 int ret = -ENOMEM; 31 32 if (exynos_gem->dma_addr) { 33 DRM_DEBUG_KMS("already allocated.\n"); 34 return 0; 35 } 36 37 init_dma_attrs(&exynos_gem->dma_attrs); 38 39 /* 40 * if EXYNOS_BO_CONTIG, fully physically contiguous memory 41 * region will be allocated else physically contiguous 42 * as possible. 43 */ 44 if (!(exynos_gem->flags & EXYNOS_BO_NONCONTIG)) 45 dma_set_attr(DMA_ATTR_FORCE_CONTIGUOUS, &exynos_gem->dma_attrs); 46 47 /* 48 * if EXYNOS_BO_WC or EXYNOS_BO_NONCACHABLE, writecombine mapping 49 * else cachable mapping. 50 */ 51 if (exynos_gem->flags & EXYNOS_BO_WC || 52 !(exynos_gem->flags & EXYNOS_BO_CACHABLE)) 53 attr = DMA_ATTR_WRITE_COMBINE; 54 else 55 attr = DMA_ATTR_NON_CONSISTENT; 56 57 dma_set_attr(attr, &exynos_gem->dma_attrs); 58 dma_set_attr(DMA_ATTR_NO_KERNEL_MAPPING, &exynos_gem->dma_attrs); 59 60 nr_pages = exynos_gem->size >> PAGE_SHIFT; 61 62 exynos_gem->pages = drm_calloc_large(nr_pages, sizeof(struct page *)); 63 if (!exynos_gem->pages) { 64 DRM_ERROR("failed to allocate pages.\n"); 65 return -ENOMEM; 66 } 67 68 exynos_gem->cookie = dma_alloc_attrs(dev->dev, exynos_gem->size, 69 &exynos_gem->dma_addr, GFP_KERNEL, 70 &exynos_gem->dma_attrs); 71 if (!exynos_gem->cookie) { 72 DRM_ERROR("failed to allocate buffer.\n"); 73 goto err_free; 74 } 75 76 ret = dma_get_sgtable_attrs(dev->dev, &sgt, exynos_gem->cookie, 77 exynos_gem->dma_addr, exynos_gem->size, 78 &exynos_gem->dma_attrs); 79 if (ret < 0) { 80 DRM_ERROR("failed to get sgtable.\n"); 81 goto err_dma_free; 82 } 83 84 if (drm_prime_sg_to_page_addr_arrays(&sgt, exynos_gem->pages, NULL, 85 nr_pages)) { 86 DRM_ERROR("invalid sgtable.\n"); 87 ret = -EINVAL; 88 goto err_sgt_free; 89 } 90 91 sg_free_table(&sgt); 92 93 DRM_DEBUG_KMS("dma_addr(0x%lx), size(0x%lx)\n", 94 (unsigned long)exynos_gem->dma_addr, exynos_gem->size); 95 96 return 0; 97 98 err_sgt_free: 99 sg_free_table(&sgt); 100 err_dma_free: 101 dma_free_attrs(dev->dev, exynos_gem->size, exynos_gem->cookie, 102 exynos_gem->dma_addr, &exynos_gem->dma_attrs); 103 err_free: 104 drm_free_large(exynos_gem->pages); 105 106 return ret; 107 } 108 109 static void exynos_drm_free_buf(struct exynos_drm_gem *exynos_gem) 110 { 111 struct drm_device *dev = exynos_gem->base.dev; 112 113 if (!exynos_gem->dma_addr) { 114 DRM_DEBUG_KMS("dma_addr is invalid.\n"); 115 return; 116 } 117 118 DRM_DEBUG_KMS("dma_addr(0x%lx), size(0x%lx)\n", 119 (unsigned long)exynos_gem->dma_addr, exynos_gem->size); 120 121 dma_free_attrs(dev->dev, exynos_gem->size, exynos_gem->cookie, 122 (dma_addr_t)exynos_gem->dma_addr, 123 &exynos_gem->dma_attrs); 124 125 drm_free_large(exynos_gem->pages); 126 } 127 128 static int exynos_drm_gem_handle_create(struct drm_gem_object *obj, 129 struct drm_file *file_priv, 130 unsigned int *handle) 131 { 132 int ret; 133 134 /* 135 * allocate a id of idr table where the obj is registered 136 * and handle has the id what user can see. 137 */ 138 ret = drm_gem_handle_create(file_priv, obj, handle); 139 if (ret) 140 return ret; 141 142 DRM_DEBUG_KMS("gem handle = 0x%x\n", *handle); 143 144 /* drop reference from allocate - handle holds it now. */ 145 drm_gem_object_unreference_unlocked(obj); 146 147 return 0; 148 } 149 150 void exynos_drm_gem_destroy(struct exynos_drm_gem *exynos_gem) 151 { 152 struct drm_gem_object *obj = &exynos_gem->base; 153 154 DRM_DEBUG_KMS("handle count = %d\n", obj->handle_count); 155 156 /* 157 * do not release memory region from exporter. 158 * 159 * the region will be released by exporter 160 * once dmabuf's refcount becomes 0. 161 */ 162 if (obj->import_attach) 163 drm_prime_gem_destroy(obj, exynos_gem->sgt); 164 else 165 exynos_drm_free_buf(exynos_gem); 166 167 /* release file pointer to gem object. */ 168 drm_gem_object_release(obj); 169 170 kfree(exynos_gem); 171 } 172 173 unsigned long exynos_drm_gem_get_size(struct drm_device *dev, 174 unsigned int gem_handle, 175 struct drm_file *file_priv) 176 { 177 struct exynos_drm_gem *exynos_gem; 178 struct drm_gem_object *obj; 179 180 obj = drm_gem_object_lookup(dev, file_priv, gem_handle); 181 if (!obj) { 182 DRM_ERROR("failed to lookup gem object.\n"); 183 return 0; 184 } 185 186 exynos_gem = to_exynos_gem(obj); 187 188 drm_gem_object_unreference_unlocked(obj); 189 190 return exynos_gem->size; 191 } 192 193 static struct exynos_drm_gem *exynos_drm_gem_init(struct drm_device *dev, 194 unsigned long size) 195 { 196 struct exynos_drm_gem *exynos_gem; 197 struct drm_gem_object *obj; 198 int ret; 199 200 exynos_gem = kzalloc(sizeof(*exynos_gem), GFP_KERNEL); 201 if (!exynos_gem) 202 return ERR_PTR(-ENOMEM); 203 204 exynos_gem->size = size; 205 obj = &exynos_gem->base; 206 207 ret = drm_gem_object_init(dev, obj, size); 208 if (ret < 0) { 209 DRM_ERROR("failed to initialize gem object\n"); 210 kfree(exynos_gem); 211 return ERR_PTR(ret); 212 } 213 214 ret = drm_gem_create_mmap_offset(obj); 215 if (ret < 0) { 216 drm_gem_object_release(obj); 217 kfree(exynos_gem); 218 return ERR_PTR(ret); 219 } 220 221 DRM_DEBUG_KMS("created file object = %p\n", obj->filp); 222 223 return exynos_gem; 224 } 225 226 struct exynos_drm_gem *exynos_drm_gem_create(struct drm_device *dev, 227 unsigned int flags, 228 unsigned long size) 229 { 230 struct exynos_drm_gem *exynos_gem; 231 int ret; 232 233 if (flags & ~(EXYNOS_BO_MASK)) { 234 DRM_ERROR("invalid flags.\n"); 235 return ERR_PTR(-EINVAL); 236 } 237 238 if (!size) { 239 DRM_ERROR("invalid size.\n"); 240 return ERR_PTR(-EINVAL); 241 } 242 243 size = roundup(size, PAGE_SIZE); 244 245 exynos_gem = exynos_drm_gem_init(dev, size); 246 if (IS_ERR(exynos_gem)) 247 return exynos_gem; 248 249 /* set memory type and cache attribute from user side. */ 250 exynos_gem->flags = flags; 251 252 ret = exynos_drm_alloc_buf(exynos_gem); 253 if (ret < 0) { 254 drm_gem_object_release(&exynos_gem->base); 255 kfree(exynos_gem); 256 return ERR_PTR(ret); 257 } 258 259 return exynos_gem; 260 } 261 262 int exynos_drm_gem_create_ioctl(struct drm_device *dev, void *data, 263 struct drm_file *file_priv) 264 { 265 struct drm_exynos_gem_create *args = data; 266 struct exynos_drm_gem *exynos_gem; 267 int ret; 268 269 exynos_gem = exynos_drm_gem_create(dev, args->flags, args->size); 270 if (IS_ERR(exynos_gem)) 271 return PTR_ERR(exynos_gem); 272 273 ret = exynos_drm_gem_handle_create(&exynos_gem->base, file_priv, 274 &args->handle); 275 if (ret) { 276 exynos_drm_gem_destroy(exynos_gem); 277 return ret; 278 } 279 280 return 0; 281 } 282 283 dma_addr_t *exynos_drm_gem_get_dma_addr(struct drm_device *dev, 284 unsigned int gem_handle, 285 struct drm_file *filp) 286 { 287 struct exynos_drm_gem *exynos_gem; 288 struct drm_gem_object *obj; 289 290 obj = drm_gem_object_lookup(dev, filp, gem_handle); 291 if (!obj) { 292 DRM_ERROR("failed to lookup gem object.\n"); 293 return ERR_PTR(-EINVAL); 294 } 295 296 exynos_gem = to_exynos_gem(obj); 297 298 return &exynos_gem->dma_addr; 299 } 300 301 void exynos_drm_gem_put_dma_addr(struct drm_device *dev, 302 unsigned int gem_handle, 303 struct drm_file *filp) 304 { 305 struct drm_gem_object *obj; 306 307 obj = drm_gem_object_lookup(dev, filp, gem_handle); 308 if (!obj) { 309 DRM_ERROR("failed to lookup gem object.\n"); 310 return; 311 } 312 313 drm_gem_object_unreference_unlocked(obj); 314 315 /* 316 * decrease obj->refcount one more time because we has already 317 * increased it at exynos_drm_gem_get_dma_addr(). 318 */ 319 drm_gem_object_unreference_unlocked(obj); 320 } 321 322 static int exynos_drm_gem_mmap_buffer(struct exynos_drm_gem *exynos_gem, 323 struct vm_area_struct *vma) 324 { 325 struct drm_device *drm_dev = exynos_gem->base.dev; 326 unsigned long vm_size; 327 int ret; 328 329 vma->vm_flags &= ~VM_PFNMAP; 330 vma->vm_pgoff = 0; 331 332 vm_size = vma->vm_end - vma->vm_start; 333 334 /* check if user-requested size is valid. */ 335 if (vm_size > exynos_gem->size) 336 return -EINVAL; 337 338 ret = dma_mmap_attrs(drm_dev->dev, vma, exynos_gem->cookie, 339 exynos_gem->dma_addr, exynos_gem->size, 340 &exynos_gem->dma_attrs); 341 if (ret < 0) { 342 DRM_ERROR("failed to mmap.\n"); 343 return ret; 344 } 345 346 return 0; 347 } 348 349 int exynos_drm_gem_get_ioctl(struct drm_device *dev, void *data, 350 struct drm_file *file_priv) 351 { 352 struct exynos_drm_gem *exynos_gem; 353 struct drm_exynos_gem_info *args = data; 354 struct drm_gem_object *obj; 355 356 mutex_lock(&dev->struct_mutex); 357 358 obj = drm_gem_object_lookup(dev, file_priv, args->handle); 359 if (!obj) { 360 DRM_ERROR("failed to lookup gem object.\n"); 361 mutex_unlock(&dev->struct_mutex); 362 return -EINVAL; 363 } 364 365 exynos_gem = to_exynos_gem(obj); 366 367 args->flags = exynos_gem->flags; 368 args->size = exynos_gem->size; 369 370 drm_gem_object_unreference(obj); 371 mutex_unlock(&dev->struct_mutex); 372 373 return 0; 374 } 375 376 int exynos_gem_map_sgt_with_dma(struct drm_device *drm_dev, 377 struct sg_table *sgt, 378 enum dma_data_direction dir) 379 { 380 int nents; 381 382 mutex_lock(&drm_dev->struct_mutex); 383 384 nents = dma_map_sg(drm_dev->dev, sgt->sgl, sgt->nents, dir); 385 if (!nents) { 386 DRM_ERROR("failed to map sgl with dma.\n"); 387 mutex_unlock(&drm_dev->struct_mutex); 388 return nents; 389 } 390 391 mutex_unlock(&drm_dev->struct_mutex); 392 return 0; 393 } 394 395 void exynos_gem_unmap_sgt_from_dma(struct drm_device *drm_dev, 396 struct sg_table *sgt, 397 enum dma_data_direction dir) 398 { 399 dma_unmap_sg(drm_dev->dev, sgt->sgl, sgt->nents, dir); 400 } 401 402 void exynos_drm_gem_free_object(struct drm_gem_object *obj) 403 { 404 exynos_drm_gem_destroy(to_exynos_gem(obj)); 405 } 406 407 int exynos_drm_gem_dumb_create(struct drm_file *file_priv, 408 struct drm_device *dev, 409 struct drm_mode_create_dumb *args) 410 { 411 struct exynos_drm_gem *exynos_gem; 412 unsigned int flags; 413 int ret; 414 415 /* 416 * allocate memory to be used for framebuffer. 417 * - this callback would be called by user application 418 * with DRM_IOCTL_MODE_CREATE_DUMB command. 419 */ 420 421 args->pitch = args->width * ((args->bpp + 7) / 8); 422 args->size = args->pitch * args->height; 423 424 if (is_drm_iommu_supported(dev)) 425 flags = EXYNOS_BO_NONCONTIG | EXYNOS_BO_WC; 426 else 427 flags = EXYNOS_BO_CONTIG | EXYNOS_BO_WC; 428 429 exynos_gem = exynos_drm_gem_create(dev, flags, args->size); 430 if (IS_ERR(exynos_gem)) { 431 dev_warn(dev->dev, "FB allocation failed.\n"); 432 return PTR_ERR(exynos_gem); 433 } 434 435 ret = exynos_drm_gem_handle_create(&exynos_gem->base, file_priv, 436 &args->handle); 437 if (ret) { 438 exynos_drm_gem_destroy(exynos_gem); 439 return ret; 440 } 441 442 return 0; 443 } 444 445 int exynos_drm_gem_dumb_map_offset(struct drm_file *file_priv, 446 struct drm_device *dev, uint32_t handle, 447 uint64_t *offset) 448 { 449 struct drm_gem_object *obj; 450 int ret = 0; 451 452 mutex_lock(&dev->struct_mutex); 453 454 /* 455 * get offset of memory allocated for drm framebuffer. 456 * - this callback would be called by user application 457 * with DRM_IOCTL_MODE_MAP_DUMB command. 458 */ 459 460 obj = drm_gem_object_lookup(dev, file_priv, handle); 461 if (!obj) { 462 DRM_ERROR("failed to lookup gem object.\n"); 463 ret = -EINVAL; 464 goto unlock; 465 } 466 467 *offset = drm_vma_node_offset_addr(&obj->vma_node); 468 DRM_DEBUG_KMS("offset = 0x%lx\n", (unsigned long)*offset); 469 470 drm_gem_object_unreference(obj); 471 unlock: 472 mutex_unlock(&dev->struct_mutex); 473 return ret; 474 } 475 476 int exynos_drm_gem_fault(struct vm_area_struct *vma, struct vm_fault *vmf) 477 { 478 struct drm_gem_object *obj = vma->vm_private_data; 479 struct exynos_drm_gem *exynos_gem = to_exynos_gem(obj); 480 unsigned long pfn; 481 pgoff_t page_offset; 482 int ret; 483 484 page_offset = ((unsigned long)vmf->virtual_address - 485 vma->vm_start) >> PAGE_SHIFT; 486 487 if (page_offset >= (exynos_gem->size >> PAGE_SHIFT)) { 488 DRM_ERROR("invalid page offset\n"); 489 ret = -EINVAL; 490 goto out; 491 } 492 493 pfn = page_to_pfn(exynos_gem->pages[page_offset]); 494 ret = vm_insert_mixed(vma, (unsigned long)vmf->virtual_address, 495 __pfn_to_pfn_t(pfn, PFN_DEV)); 496 497 out: 498 switch (ret) { 499 case 0: 500 case -ERESTARTSYS: 501 case -EINTR: 502 return VM_FAULT_NOPAGE; 503 case -ENOMEM: 504 return VM_FAULT_OOM; 505 default: 506 return VM_FAULT_SIGBUS; 507 } 508 } 509 510 int exynos_drm_gem_mmap(struct file *filp, struct vm_area_struct *vma) 511 { 512 struct exynos_drm_gem *exynos_gem; 513 struct drm_gem_object *obj; 514 int ret; 515 516 /* set vm_area_struct. */ 517 ret = drm_gem_mmap(filp, vma); 518 if (ret < 0) { 519 DRM_ERROR("failed to mmap.\n"); 520 return ret; 521 } 522 523 obj = vma->vm_private_data; 524 exynos_gem = to_exynos_gem(obj); 525 526 DRM_DEBUG_KMS("flags = 0x%x\n", exynos_gem->flags); 527 528 /* non-cachable as default. */ 529 if (exynos_gem->flags & EXYNOS_BO_CACHABLE) 530 vma->vm_page_prot = vm_get_page_prot(vma->vm_flags); 531 else if (exynos_gem->flags & EXYNOS_BO_WC) 532 vma->vm_page_prot = 533 pgprot_writecombine(vm_get_page_prot(vma->vm_flags)); 534 else 535 vma->vm_page_prot = 536 pgprot_noncached(vm_get_page_prot(vma->vm_flags)); 537 538 ret = exynos_drm_gem_mmap_buffer(exynos_gem, vma); 539 if (ret) 540 goto err_close_vm; 541 542 return ret; 543 544 err_close_vm: 545 drm_gem_vm_close(vma); 546 547 return ret; 548 } 549 550 /* low-level interface prime helpers */ 551 struct sg_table *exynos_drm_gem_prime_get_sg_table(struct drm_gem_object *obj) 552 { 553 struct exynos_drm_gem *exynos_gem = to_exynos_gem(obj); 554 int npages; 555 556 npages = exynos_gem->size >> PAGE_SHIFT; 557 558 return drm_prime_pages_to_sg(exynos_gem->pages, npages); 559 } 560 561 struct drm_gem_object * 562 exynos_drm_gem_prime_import_sg_table(struct drm_device *dev, 563 struct dma_buf_attachment *attach, 564 struct sg_table *sgt) 565 { 566 struct exynos_drm_gem *exynos_gem; 567 int npages; 568 int ret; 569 570 exynos_gem = exynos_drm_gem_init(dev, attach->dmabuf->size); 571 if (IS_ERR(exynos_gem)) { 572 ret = PTR_ERR(exynos_gem); 573 return ERR_PTR(ret); 574 } 575 576 exynos_gem->dma_addr = sg_dma_address(sgt->sgl); 577 578 npages = exynos_gem->size >> PAGE_SHIFT; 579 exynos_gem->pages = drm_malloc_ab(npages, sizeof(struct page *)); 580 if (!exynos_gem->pages) { 581 ret = -ENOMEM; 582 goto err; 583 } 584 585 ret = drm_prime_sg_to_page_addr_arrays(sgt, exynos_gem->pages, NULL, 586 npages); 587 if (ret < 0) 588 goto err_free_large; 589 590 exynos_gem->sgt = sgt; 591 592 if (sgt->nents == 1) { 593 /* always physically continuous memory if sgt->nents is 1. */ 594 exynos_gem->flags |= EXYNOS_BO_CONTIG; 595 } else { 596 /* 597 * this case could be CONTIG or NONCONTIG type but for now 598 * sets NONCONTIG. 599 * TODO. we have to find a way that exporter can notify 600 * the type of its own buffer to importer. 601 */ 602 exynos_gem->flags |= EXYNOS_BO_NONCONTIG; 603 } 604 605 return &exynos_gem->base; 606 607 err_free_large: 608 drm_free_large(exynos_gem->pages); 609 err: 610 drm_gem_object_release(&exynos_gem->base); 611 kfree(exynos_gem); 612 return ERR_PTR(ret); 613 } 614 615 void *exynos_drm_gem_prime_vmap(struct drm_gem_object *obj) 616 { 617 return NULL; 618 } 619 620 void exynos_drm_gem_prime_vunmap(struct drm_gem_object *obj, void *vaddr) 621 { 622 /* Nothing to do */ 623 } 624