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 <drm/exynos_drm.h> 17 18#include "exynos_drm_drv.h" 19#include "exynos_drm_gem.h" 20#include "exynos_drm_buf.h" 21#include "exynos_drm_iommu.h" 22 23static unsigned int convert_to_vm_err_msg(int msg) 24{ 25 unsigned int out_msg; 26 27 switch (msg) { 28 case 0: 29 case -ERESTARTSYS: 30 case -EINTR: 31 out_msg = VM_FAULT_NOPAGE; 32 break; 33 34 case -ENOMEM: 35 out_msg = VM_FAULT_OOM; 36 break; 37 38 default: 39 out_msg = VM_FAULT_SIGBUS; 40 break; 41 } 42 43 return out_msg; 44} 45 46static int check_gem_flags(unsigned int flags) 47{ 48 if (flags & ~(EXYNOS_BO_MASK)) { 49 DRM_ERROR("invalid flags.\n"); 50 return -EINVAL; 51 } 52 53 return 0; 54} 55 56static void update_vm_cache_attr(struct exynos_drm_gem_obj *obj, 57 struct vm_area_struct *vma) 58{ 59 DRM_DEBUG_KMS("flags = 0x%x\n", obj->flags); 60 61 /* non-cachable as default. */ 62 if (obj->flags & EXYNOS_BO_CACHABLE) 63 vma->vm_page_prot = vm_get_page_prot(vma->vm_flags); 64 else if (obj->flags & EXYNOS_BO_WC) 65 vma->vm_page_prot = 66 pgprot_writecombine(vm_get_page_prot(vma->vm_flags)); 67 else 68 vma->vm_page_prot = 69 pgprot_noncached(vm_get_page_prot(vma->vm_flags)); 70} 71 72static unsigned long roundup_gem_size(unsigned long size, unsigned int flags) 73{ 74 /* TODO */ 75 76 return roundup(size, PAGE_SIZE); 77} 78 79static int exynos_drm_gem_map_buf(struct drm_gem_object *obj, 80 struct vm_area_struct *vma, 81 unsigned long f_vaddr, 82 pgoff_t page_offset) 83{ 84 struct exynos_drm_gem_obj *exynos_gem_obj = to_exynos_gem_obj(obj); 85 struct exynos_drm_gem_buf *buf = exynos_gem_obj->buffer; 86 struct scatterlist *sgl; 87 unsigned long pfn; 88 int i; 89 90 if (!buf->sgt) 91 return -EINTR; 92 93 if (page_offset >= (buf->size >> PAGE_SHIFT)) { 94 DRM_ERROR("invalid page offset\n"); 95 return -EINVAL; 96 } 97 98 sgl = buf->sgt->sgl; 99 for_each_sg(buf->sgt->sgl, sgl, buf->sgt->nents, i) { 100 if (page_offset < (sgl->length >> PAGE_SHIFT)) 101 break; 102 page_offset -= (sgl->length >> PAGE_SHIFT); 103 } 104 105 pfn = __phys_to_pfn(sg_phys(sgl)) + page_offset; 106 107 return vm_insert_mixed(vma, f_vaddr, pfn); 108} 109 110static int exynos_drm_gem_handle_create(struct drm_gem_object *obj, 111 struct drm_file *file_priv, 112 unsigned int *handle) 113{ 114 int ret; 115 116 /* 117 * allocate a id of idr table where the obj is registered 118 * and handle has the id what user can see. 119 */ 120 ret = drm_gem_handle_create(file_priv, obj, handle); 121 if (ret) 122 return ret; 123 124 DRM_DEBUG_KMS("gem handle = 0x%x\n", *handle); 125 126 /* drop reference from allocate - handle holds it now. */ 127 drm_gem_object_unreference_unlocked(obj); 128 129 return 0; 130} 131 132void exynos_drm_gem_destroy(struct exynos_drm_gem_obj *exynos_gem_obj) 133{ 134 struct drm_gem_object *obj; 135 struct exynos_drm_gem_buf *buf; 136 137 obj = &exynos_gem_obj->base; 138 buf = exynos_gem_obj->buffer; 139 140 DRM_DEBUG_KMS("handle count = %d\n", obj->handle_count); 141 142 /* 143 * do not release memory region from exporter. 144 * 145 * the region will be released by exporter 146 * once dmabuf's refcount becomes 0. 147 */ 148 if (obj->import_attach) 149 goto out; 150 151 exynos_drm_free_buf(obj->dev, exynos_gem_obj->flags, buf); 152 153out: 154 exynos_drm_fini_buf(obj->dev, buf); 155 exynos_gem_obj->buffer = NULL; 156 157 drm_gem_free_mmap_offset(obj); 158 159 /* release file pointer to gem object. */ 160 drm_gem_object_release(obj); 161 162 kfree(exynos_gem_obj); 163 exynos_gem_obj = NULL; 164} 165 166unsigned long exynos_drm_gem_get_size(struct drm_device *dev, 167 unsigned int gem_handle, 168 struct drm_file *file_priv) 169{ 170 struct exynos_drm_gem_obj *exynos_gem_obj; 171 struct drm_gem_object *obj; 172 173 obj = drm_gem_object_lookup(dev, file_priv, gem_handle); 174 if (!obj) { 175 DRM_ERROR("failed to lookup gem object.\n"); 176 return 0; 177 } 178 179 exynos_gem_obj = to_exynos_gem_obj(obj); 180 181 drm_gem_object_unreference_unlocked(obj); 182 183 return exynos_gem_obj->buffer->size; 184} 185 186 187struct exynos_drm_gem_obj *exynos_drm_gem_init(struct drm_device *dev, 188 unsigned long size) 189{ 190 struct exynos_drm_gem_obj *exynos_gem_obj; 191 struct drm_gem_object *obj; 192 int ret; 193 194 exynos_gem_obj = kzalloc(sizeof(*exynos_gem_obj), GFP_KERNEL); 195 if (!exynos_gem_obj) 196 return NULL; 197 198 exynos_gem_obj->size = size; 199 obj = &exynos_gem_obj->base; 200 201 ret = drm_gem_object_init(dev, obj, size); 202 if (ret < 0) { 203 DRM_ERROR("failed to initialize gem object\n"); 204 kfree(exynos_gem_obj); 205 return NULL; 206 } 207 208 DRM_DEBUG_KMS("created file object = 0x%x\n", (unsigned int)obj->filp); 209 210 return exynos_gem_obj; 211} 212 213struct exynos_drm_gem_obj *exynos_drm_gem_create(struct drm_device *dev, 214 unsigned int flags, 215 unsigned long size) 216{ 217 struct exynos_drm_gem_obj *exynos_gem_obj; 218 struct exynos_drm_gem_buf *buf; 219 int ret; 220 221 if (!size) { 222 DRM_ERROR("invalid size.\n"); 223 return ERR_PTR(-EINVAL); 224 } 225 226 size = roundup_gem_size(size, flags); 227 228 ret = check_gem_flags(flags); 229 if (ret) 230 return ERR_PTR(ret); 231 232 buf = exynos_drm_init_buf(dev, size); 233 if (!buf) 234 return ERR_PTR(-ENOMEM); 235 236 exynos_gem_obj = exynos_drm_gem_init(dev, size); 237 if (!exynos_gem_obj) { 238 ret = -ENOMEM; 239 goto err_fini_buf; 240 } 241 242 exynos_gem_obj->buffer = buf; 243 244 /* set memory type and cache attribute from user side. */ 245 exynos_gem_obj->flags = flags; 246 247 ret = exynos_drm_alloc_buf(dev, buf, flags); 248 if (ret < 0) 249 goto err_gem_fini; 250 251 return exynos_gem_obj; 252 253err_gem_fini: 254 drm_gem_object_release(&exynos_gem_obj->base); 255 kfree(exynos_gem_obj); 256err_fini_buf: 257 exynos_drm_fini_buf(dev, buf); 258 return ERR_PTR(ret); 259} 260 261int exynos_drm_gem_create_ioctl(struct drm_device *dev, void *data, 262 struct drm_file *file_priv) 263{ 264 struct drm_exynos_gem_create *args = data; 265 struct exynos_drm_gem_obj *exynos_gem_obj; 266 int ret; 267 268 exynos_gem_obj = exynos_drm_gem_create(dev, args->flags, args->size); 269 if (IS_ERR(exynos_gem_obj)) 270 return PTR_ERR(exynos_gem_obj); 271 272 ret = exynos_drm_gem_handle_create(&exynos_gem_obj->base, file_priv, 273 &args->handle); 274 if (ret) { 275 exynos_drm_gem_destroy(exynos_gem_obj); 276 return ret; 277 } 278 279 return 0; 280} 281 282dma_addr_t *exynos_drm_gem_get_dma_addr(struct drm_device *dev, 283 unsigned int gem_handle, 284 struct drm_file *filp) 285{ 286 struct exynos_drm_gem_obj *exynos_gem_obj; 287 struct drm_gem_object *obj; 288 289 obj = drm_gem_object_lookup(dev, filp, gem_handle); 290 if (!obj) { 291 DRM_ERROR("failed to lookup gem object.\n"); 292 return ERR_PTR(-EINVAL); 293 } 294 295 exynos_gem_obj = to_exynos_gem_obj(obj); 296 297 return &exynos_gem_obj->buffer->dma_addr; 298} 299 300void exynos_drm_gem_put_dma_addr(struct drm_device *dev, 301 unsigned int gem_handle, 302 struct drm_file *filp) 303{ 304 struct drm_gem_object *obj; 305 306 obj = drm_gem_object_lookup(dev, filp, gem_handle); 307 if (!obj) { 308 DRM_ERROR("failed to lookup gem object.\n"); 309 return; 310 } 311 312 drm_gem_object_unreference_unlocked(obj); 313 314 /* 315 * decrease obj->refcount one more time because we has already 316 * increased it at exynos_drm_gem_get_dma_addr(). 317 */ 318 drm_gem_object_unreference_unlocked(obj); 319} 320 321int exynos_drm_gem_mmap_buffer(struct exynos_drm_gem_obj *exynos_gem_obj, 322 struct vm_area_struct *vma) 323{ 324 struct drm_device *drm_dev = exynos_gem_obj->base.dev; 325 struct exynos_drm_gem_buf *buffer; 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 /* 335 * a buffer contains information to physically continuous memory 336 * allocated by user request or at framebuffer creation. 337 */ 338 buffer = exynos_gem_obj->buffer; 339 340 /* check if user-requested size is valid. */ 341 if (vm_size > buffer->size) 342 return -EINVAL; 343 344 ret = dma_mmap_attrs(drm_dev->dev, vma, buffer->pages, 345 buffer->dma_addr, buffer->size, 346 &buffer->dma_attrs); 347 if (ret < 0) { 348 DRM_ERROR("failed to mmap.\n"); 349 return ret; 350 } 351 352 return 0; 353} 354 355int exynos_drm_gem_get_ioctl(struct drm_device *dev, void *data, 356 struct drm_file *file_priv) 357{ struct exynos_drm_gem_obj *exynos_gem_obj; 358 struct drm_exynos_gem_info *args = data; 359 struct drm_gem_object *obj; 360 361 mutex_lock(&dev->struct_mutex); 362 363 obj = drm_gem_object_lookup(dev, file_priv, args->handle); 364 if (!obj) { 365 DRM_ERROR("failed to lookup gem object.\n"); 366 mutex_unlock(&dev->struct_mutex); 367 return -EINVAL; 368 } 369 370 exynos_gem_obj = to_exynos_gem_obj(obj); 371 372 args->flags = exynos_gem_obj->flags; 373 args->size = exynos_gem_obj->size; 374 375 drm_gem_object_unreference(obj); 376 mutex_unlock(&dev->struct_mutex); 377 378 return 0; 379} 380 381struct vm_area_struct *exynos_gem_get_vma(struct vm_area_struct *vma) 382{ 383 struct vm_area_struct *vma_copy; 384 385 vma_copy = kmalloc(sizeof(*vma_copy), GFP_KERNEL); 386 if (!vma_copy) 387 return NULL; 388 389 if (vma->vm_ops && vma->vm_ops->open) 390 vma->vm_ops->open(vma); 391 392 if (vma->vm_file) 393 get_file(vma->vm_file); 394 395 memcpy(vma_copy, vma, sizeof(*vma)); 396 397 vma_copy->vm_mm = NULL; 398 vma_copy->vm_next = NULL; 399 vma_copy->vm_prev = NULL; 400 401 return vma_copy; 402} 403 404void exynos_gem_put_vma(struct vm_area_struct *vma) 405{ 406 if (!vma) 407 return; 408 409 if (vma->vm_ops && vma->vm_ops->close) 410 vma->vm_ops->close(vma); 411 412 if (vma->vm_file) 413 fput(vma->vm_file); 414 415 kfree(vma); 416} 417 418int exynos_gem_get_pages_from_userptr(unsigned long start, 419 unsigned int npages, 420 struct page **pages, 421 struct vm_area_struct *vma) 422{ 423 int get_npages; 424 425 /* the memory region mmaped with VM_PFNMAP. */ 426 if (vma_is_io(vma)) { 427 unsigned int i; 428 429 for (i = 0; i < npages; ++i, start += PAGE_SIZE) { 430 unsigned long pfn; 431 int ret = follow_pfn(vma, start, &pfn); 432 if (ret) 433 return ret; 434 435 pages[i] = pfn_to_page(pfn); 436 } 437 438 if (i != npages) { 439 DRM_ERROR("failed to get user_pages.\n"); 440 return -EINVAL; 441 } 442 443 return 0; 444 } 445 446 get_npages = get_user_pages(current, current->mm, start, 447 npages, 1, 1, pages, NULL); 448 get_npages = max(get_npages, 0); 449 if (get_npages != npages) { 450 DRM_ERROR("failed to get user_pages.\n"); 451 while (get_npages) 452 put_page(pages[--get_npages]); 453 return -EFAULT; 454 } 455 456 return 0; 457} 458 459void exynos_gem_put_pages_to_userptr(struct page **pages, 460 unsigned int npages, 461 struct vm_area_struct *vma) 462{ 463 if (!vma_is_io(vma)) { 464 unsigned int i; 465 466 for (i = 0; i < npages; i++) { 467 set_page_dirty_lock(pages[i]); 468 469 /* 470 * undo the reference we took when populating 471 * the table. 472 */ 473 put_page(pages[i]); 474 } 475 } 476} 477 478int exynos_gem_map_sgt_with_dma(struct drm_device *drm_dev, 479 struct sg_table *sgt, 480 enum dma_data_direction dir) 481{ 482 int nents; 483 484 mutex_lock(&drm_dev->struct_mutex); 485 486 nents = dma_map_sg(drm_dev->dev, sgt->sgl, sgt->nents, dir); 487 if (!nents) { 488 DRM_ERROR("failed to map sgl with dma.\n"); 489 mutex_unlock(&drm_dev->struct_mutex); 490 return nents; 491 } 492 493 mutex_unlock(&drm_dev->struct_mutex); 494 return 0; 495} 496 497void exynos_gem_unmap_sgt_from_dma(struct drm_device *drm_dev, 498 struct sg_table *sgt, 499 enum dma_data_direction dir) 500{ 501 dma_unmap_sg(drm_dev->dev, sgt->sgl, sgt->nents, dir); 502} 503 504void exynos_drm_gem_free_object(struct drm_gem_object *obj) 505{ 506 struct exynos_drm_gem_obj *exynos_gem_obj; 507 struct exynos_drm_gem_buf *buf; 508 509 exynos_gem_obj = to_exynos_gem_obj(obj); 510 buf = exynos_gem_obj->buffer; 511 512 if (obj->import_attach) 513 drm_prime_gem_destroy(obj, buf->sgt); 514 515 exynos_drm_gem_destroy(to_exynos_gem_obj(obj)); 516} 517 518int exynos_drm_gem_dumb_create(struct drm_file *file_priv, 519 struct drm_device *dev, 520 struct drm_mode_create_dumb *args) 521{ 522 struct exynos_drm_gem_obj *exynos_gem_obj; 523 int ret; 524 525 /* 526 * allocate memory to be used for framebuffer. 527 * - this callback would be called by user application 528 * with DRM_IOCTL_MODE_CREATE_DUMB command. 529 */ 530 531 args->pitch = args->width * ((args->bpp + 7) / 8); 532 args->size = args->pitch * args->height; 533 534 if (is_drm_iommu_supported(dev)) { 535 exynos_gem_obj = exynos_drm_gem_create(dev, 536 EXYNOS_BO_NONCONTIG | EXYNOS_BO_WC, 537 args->size); 538 } else { 539 exynos_gem_obj = exynos_drm_gem_create(dev, 540 EXYNOS_BO_CONTIG | EXYNOS_BO_WC, 541 args->size); 542 } 543 544 if (IS_ERR(exynos_gem_obj)) { 545 dev_warn(dev->dev, "FB allocation failed.\n"); 546 return PTR_ERR(exynos_gem_obj); 547 } 548 549 ret = exynos_drm_gem_handle_create(&exynos_gem_obj->base, file_priv, 550 &args->handle); 551 if (ret) { 552 exynos_drm_gem_destroy(exynos_gem_obj); 553 return ret; 554 } 555 556 return 0; 557} 558 559int exynos_drm_gem_dumb_map_offset(struct drm_file *file_priv, 560 struct drm_device *dev, uint32_t handle, 561 uint64_t *offset) 562{ 563 struct drm_gem_object *obj; 564 int ret = 0; 565 566 mutex_lock(&dev->struct_mutex); 567 568 /* 569 * get offset of memory allocated for drm framebuffer. 570 * - this callback would be called by user application 571 * with DRM_IOCTL_MODE_MAP_DUMB command. 572 */ 573 574 obj = drm_gem_object_lookup(dev, file_priv, handle); 575 if (!obj) { 576 DRM_ERROR("failed to lookup gem object.\n"); 577 ret = -EINVAL; 578 goto unlock; 579 } 580 581 ret = drm_gem_create_mmap_offset(obj); 582 if (ret) 583 goto out; 584 585 *offset = drm_vma_node_offset_addr(&obj->vma_node); 586 DRM_DEBUG_KMS("offset = 0x%lx\n", (unsigned long)*offset); 587 588out: 589 drm_gem_object_unreference(obj); 590unlock: 591 mutex_unlock(&dev->struct_mutex); 592 return ret; 593} 594 595int exynos_drm_gem_fault(struct vm_area_struct *vma, struct vm_fault *vmf) 596{ 597 struct drm_gem_object *obj = vma->vm_private_data; 598 struct drm_device *dev = obj->dev; 599 unsigned long f_vaddr; 600 pgoff_t page_offset; 601 int ret; 602 603 page_offset = ((unsigned long)vmf->virtual_address - 604 vma->vm_start) >> PAGE_SHIFT; 605 f_vaddr = (unsigned long)vmf->virtual_address; 606 607 mutex_lock(&dev->struct_mutex); 608 609 ret = exynos_drm_gem_map_buf(obj, vma, f_vaddr, page_offset); 610 if (ret < 0) 611 DRM_ERROR("failed to map a buffer with user.\n"); 612 613 mutex_unlock(&dev->struct_mutex); 614 615 return convert_to_vm_err_msg(ret); 616} 617 618int exynos_drm_gem_mmap(struct file *filp, struct vm_area_struct *vma) 619{ 620 struct exynos_drm_gem_obj *exynos_gem_obj; 621 struct drm_gem_object *obj; 622 int ret; 623 624 /* set vm_area_struct. */ 625 ret = drm_gem_mmap(filp, vma); 626 if (ret < 0) { 627 DRM_ERROR("failed to mmap.\n"); 628 return ret; 629 } 630 631 obj = vma->vm_private_data; 632 exynos_gem_obj = to_exynos_gem_obj(obj); 633 634 ret = check_gem_flags(exynos_gem_obj->flags); 635 if (ret) 636 goto err_close_vm; 637 638 update_vm_cache_attr(exynos_gem_obj, vma); 639 640 ret = exynos_drm_gem_mmap_buffer(exynos_gem_obj, vma); 641 if (ret) 642 goto err_close_vm; 643 644 return ret; 645 646err_close_vm: 647 drm_gem_vm_close(vma); 648 drm_gem_free_mmap_offset(obj); 649 650 return ret; 651} 652