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