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_put_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 static struct exynos_drm_gem *exynos_drm_gem_init(struct drm_device *dev, 175 unsigned long size) 176 { 177 struct exynos_drm_gem *exynos_gem; 178 struct drm_gem_object *obj; 179 int ret; 180 181 exynos_gem = kzalloc(sizeof(*exynos_gem), GFP_KERNEL); 182 if (!exynos_gem) 183 return ERR_PTR(-ENOMEM); 184 185 exynos_gem->size = size; 186 obj = &exynos_gem->base; 187 188 ret = drm_gem_object_init(dev, obj, size); 189 if (ret < 0) { 190 DRM_ERROR("failed to initialize gem object\n"); 191 kfree(exynos_gem); 192 return ERR_PTR(ret); 193 } 194 195 ret = drm_gem_create_mmap_offset(obj); 196 if (ret < 0) { 197 drm_gem_object_release(obj); 198 kfree(exynos_gem); 199 return ERR_PTR(ret); 200 } 201 202 DRM_DEBUG_KMS("created file object = %pK\n", obj->filp); 203 204 return exynos_gem; 205 } 206 207 struct exynos_drm_gem *exynos_drm_gem_create(struct drm_device *dev, 208 unsigned int flags, 209 unsigned long size) 210 { 211 struct exynos_drm_gem *exynos_gem; 212 int ret; 213 214 if (flags & ~(EXYNOS_BO_MASK)) { 215 DRM_ERROR("invalid GEM buffer flags: %u\n", flags); 216 return ERR_PTR(-EINVAL); 217 } 218 219 if (!size) { 220 DRM_ERROR("invalid GEM buffer size: %lu\n", size); 221 return ERR_PTR(-EINVAL); 222 } 223 224 size = roundup(size, PAGE_SIZE); 225 226 exynos_gem = exynos_drm_gem_init(dev, size); 227 if (IS_ERR(exynos_gem)) 228 return exynos_gem; 229 230 if (!is_drm_iommu_supported(dev) && (flags & EXYNOS_BO_NONCONTIG)) { 231 /* 232 * when no IOMMU is available, all allocated buffers are 233 * contiguous anyway, so drop EXYNOS_BO_NONCONTIG flag 234 */ 235 flags &= ~EXYNOS_BO_NONCONTIG; 236 DRM_WARN("Non-contiguous allocation is not supported without IOMMU, falling back to contiguous buffer\n"); 237 } 238 239 /* set memory type and cache attribute from user side. */ 240 exynos_gem->flags = flags; 241 242 ret = exynos_drm_alloc_buf(exynos_gem); 243 if (ret < 0) { 244 drm_gem_object_release(&exynos_gem->base); 245 kfree(exynos_gem); 246 return ERR_PTR(ret); 247 } 248 249 return exynos_gem; 250 } 251 252 int exynos_drm_gem_create_ioctl(struct drm_device *dev, void *data, 253 struct drm_file *file_priv) 254 { 255 struct drm_exynos_gem_create *args = data; 256 struct exynos_drm_gem *exynos_gem; 257 int ret; 258 259 exynos_gem = exynos_drm_gem_create(dev, args->flags, args->size); 260 if (IS_ERR(exynos_gem)) 261 return PTR_ERR(exynos_gem); 262 263 ret = exynos_drm_gem_handle_create(&exynos_gem->base, file_priv, 264 &args->handle); 265 if (ret) { 266 exynos_drm_gem_destroy(exynos_gem); 267 return ret; 268 } 269 270 return 0; 271 } 272 273 int exynos_drm_gem_map_ioctl(struct drm_device *dev, void *data, 274 struct drm_file *file_priv) 275 { 276 struct drm_exynos_gem_map *args = data; 277 278 return drm_gem_dumb_map_offset(file_priv, dev, args->handle, 279 &args->offset); 280 } 281 282 struct exynos_drm_gem *exynos_drm_gem_get(struct drm_file *filp, 283 unsigned int gem_handle) 284 { 285 struct drm_gem_object *obj; 286 287 obj = drm_gem_object_lookup(filp, gem_handle); 288 if (!obj) 289 return NULL; 290 return to_exynos_gem(obj); 291 } 292 293 static int exynos_drm_gem_mmap_buffer(struct exynos_drm_gem *exynos_gem, 294 struct vm_area_struct *vma) 295 { 296 struct drm_device *drm_dev = exynos_gem->base.dev; 297 unsigned long vm_size; 298 int ret; 299 300 vma->vm_flags &= ~VM_PFNMAP; 301 vma->vm_pgoff = 0; 302 303 vm_size = vma->vm_end - vma->vm_start; 304 305 /* check if user-requested size is valid. */ 306 if (vm_size > exynos_gem->size) 307 return -EINVAL; 308 309 ret = dma_mmap_attrs(to_dma_dev(drm_dev), vma, exynos_gem->cookie, 310 exynos_gem->dma_addr, exynos_gem->size, 311 exynos_gem->dma_attrs); 312 if (ret < 0) { 313 DRM_ERROR("failed to mmap.\n"); 314 return ret; 315 } 316 317 return 0; 318 } 319 320 int exynos_drm_gem_get_ioctl(struct drm_device *dev, void *data, 321 struct drm_file *file_priv) 322 { 323 struct exynos_drm_gem *exynos_gem; 324 struct drm_exynos_gem_info *args = data; 325 struct drm_gem_object *obj; 326 327 obj = drm_gem_object_lookup(file_priv, args->handle); 328 if (!obj) { 329 DRM_ERROR("failed to lookup gem object.\n"); 330 return -EINVAL; 331 } 332 333 exynos_gem = to_exynos_gem(obj); 334 335 args->flags = exynos_gem->flags; 336 args->size = exynos_gem->size; 337 338 drm_gem_object_put_unlocked(obj); 339 340 return 0; 341 } 342 343 void exynos_drm_gem_free_object(struct drm_gem_object *obj) 344 { 345 exynos_drm_gem_destroy(to_exynos_gem(obj)); 346 } 347 348 int exynos_drm_gem_dumb_create(struct drm_file *file_priv, 349 struct drm_device *dev, 350 struct drm_mode_create_dumb *args) 351 { 352 struct exynos_drm_gem *exynos_gem; 353 unsigned int flags; 354 int ret; 355 356 /* 357 * allocate memory to be used for framebuffer. 358 * - this callback would be called by user application 359 * with DRM_IOCTL_MODE_CREATE_DUMB command. 360 */ 361 362 args->pitch = args->width * ((args->bpp + 7) / 8); 363 args->size = args->pitch * args->height; 364 365 if (is_drm_iommu_supported(dev)) 366 flags = EXYNOS_BO_NONCONTIG | EXYNOS_BO_WC; 367 else 368 flags = EXYNOS_BO_CONTIG | EXYNOS_BO_WC; 369 370 exynos_gem = exynos_drm_gem_create(dev, flags, args->size); 371 if (IS_ERR(exynos_gem)) { 372 dev_warn(dev->dev, "FB allocation failed.\n"); 373 return PTR_ERR(exynos_gem); 374 } 375 376 ret = exynos_drm_gem_handle_create(&exynos_gem->base, file_priv, 377 &args->handle); 378 if (ret) { 379 exynos_drm_gem_destroy(exynos_gem); 380 return ret; 381 } 382 383 return 0; 384 } 385 386 vm_fault_t exynos_drm_gem_fault(struct vm_fault *vmf) 387 { 388 struct vm_area_struct *vma = vmf->vma; 389 struct drm_gem_object *obj = vma->vm_private_data; 390 struct exynos_drm_gem *exynos_gem = to_exynos_gem(obj); 391 unsigned long pfn; 392 pgoff_t page_offset; 393 394 page_offset = (vmf->address - vma->vm_start) >> PAGE_SHIFT; 395 396 if (page_offset >= (exynos_gem->size >> PAGE_SHIFT)) { 397 DRM_ERROR("invalid page offset\n"); 398 return VM_FAULT_SIGBUS; 399 } 400 401 pfn = page_to_pfn(exynos_gem->pages[page_offset]); 402 return vmf_insert_mixed(vma, vmf->address, 403 __pfn_to_pfn_t(pfn, PFN_DEV)); 404 } 405 406 static int exynos_drm_gem_mmap_obj(struct drm_gem_object *obj, 407 struct vm_area_struct *vma) 408 { 409 struct exynos_drm_gem *exynos_gem = to_exynos_gem(obj); 410 int ret; 411 412 DRM_DEBUG_KMS("flags = 0x%x\n", exynos_gem->flags); 413 414 /* non-cachable as default. */ 415 if (exynos_gem->flags & EXYNOS_BO_CACHABLE) 416 vma->vm_page_prot = vm_get_page_prot(vma->vm_flags); 417 else if (exynos_gem->flags & EXYNOS_BO_WC) 418 vma->vm_page_prot = 419 pgprot_writecombine(vm_get_page_prot(vma->vm_flags)); 420 else 421 vma->vm_page_prot = 422 pgprot_noncached(vm_get_page_prot(vma->vm_flags)); 423 424 ret = exynos_drm_gem_mmap_buffer(exynos_gem, vma); 425 if (ret) 426 goto err_close_vm; 427 428 return ret; 429 430 err_close_vm: 431 drm_gem_vm_close(vma); 432 433 return ret; 434 } 435 436 int exynos_drm_gem_mmap(struct file *filp, struct vm_area_struct *vma) 437 { 438 struct drm_gem_object *obj; 439 int ret; 440 441 /* set vm_area_struct. */ 442 ret = drm_gem_mmap(filp, vma); 443 if (ret < 0) { 444 DRM_ERROR("failed to mmap.\n"); 445 return ret; 446 } 447 448 obj = vma->vm_private_data; 449 450 if (obj->import_attach) 451 return dma_buf_mmap(obj->dma_buf, vma, 0); 452 453 return exynos_drm_gem_mmap_obj(obj, vma); 454 } 455 456 /* low-level interface prime helpers */ 457 struct drm_gem_object *exynos_drm_gem_prime_import(struct drm_device *dev, 458 struct dma_buf *dma_buf) 459 { 460 return drm_gem_prime_import_dev(dev, dma_buf, to_dma_dev(dev)); 461 } 462 463 struct sg_table *exynos_drm_gem_prime_get_sg_table(struct drm_gem_object *obj) 464 { 465 struct exynos_drm_gem *exynos_gem = to_exynos_gem(obj); 466 int npages; 467 468 npages = exynos_gem->size >> PAGE_SHIFT; 469 470 return drm_prime_pages_to_sg(exynos_gem->pages, npages); 471 } 472 473 struct drm_gem_object * 474 exynos_drm_gem_prime_import_sg_table(struct drm_device *dev, 475 struct dma_buf_attachment *attach, 476 struct sg_table *sgt) 477 { 478 struct exynos_drm_gem *exynos_gem; 479 int npages; 480 int ret; 481 482 exynos_gem = exynos_drm_gem_init(dev, attach->dmabuf->size); 483 if (IS_ERR(exynos_gem)) { 484 ret = PTR_ERR(exynos_gem); 485 return ERR_PTR(ret); 486 } 487 488 exynos_gem->dma_addr = sg_dma_address(sgt->sgl); 489 490 npages = exynos_gem->size >> PAGE_SHIFT; 491 exynos_gem->pages = kvmalloc_array(npages, sizeof(struct page *), GFP_KERNEL); 492 if (!exynos_gem->pages) { 493 ret = -ENOMEM; 494 goto err; 495 } 496 497 ret = drm_prime_sg_to_page_addr_arrays(sgt, exynos_gem->pages, NULL, 498 npages); 499 if (ret < 0) 500 goto err_free_large; 501 502 exynos_gem->sgt = sgt; 503 504 if (sgt->nents == 1) { 505 /* always physically continuous memory if sgt->nents is 1. */ 506 exynos_gem->flags |= EXYNOS_BO_CONTIG; 507 } else { 508 /* 509 * this case could be CONTIG or NONCONTIG type but for now 510 * sets NONCONTIG. 511 * TODO. we have to find a way that exporter can notify 512 * the type of its own buffer to importer. 513 */ 514 exynos_gem->flags |= EXYNOS_BO_NONCONTIG; 515 } 516 517 return &exynos_gem->base; 518 519 err_free_large: 520 kvfree(exynos_gem->pages); 521 err: 522 drm_gem_object_release(&exynos_gem->base); 523 kfree(exynos_gem); 524 return ERR_PTR(ret); 525 } 526 527 void *exynos_drm_gem_prime_vmap(struct drm_gem_object *obj) 528 { 529 return NULL; 530 } 531 532 void exynos_drm_gem_prime_vunmap(struct drm_gem_object *obj, void *vaddr) 533 { 534 /* Nothing to do */ 535 } 536 537 int exynos_drm_gem_prime_mmap(struct drm_gem_object *obj, 538 struct vm_area_struct *vma) 539 { 540 int ret; 541 542 ret = drm_gem_mmap_obj(obj, obj->size, vma); 543 if (ret < 0) 544 return ret; 545 546 return exynos_drm_gem_mmap_obj(obj, vma); 547 } 548