drivers/gpu/drm/exynos/exynos_drm_gem.c

   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 = 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(to_dma_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(to_dma_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(to_dma_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(to_dma_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(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         if (!is_drm_iommu_supported(dev) && (flags & EXYNOS_BO_NONCONTIG)) {
 250                 /*
 251                  * when no IOMMU is available, all allocated buffers are
 252                  * contiguous anyway, so drop EXYNOS_BO_NONCONTIG flag
 253                  */
 254                 flags &= ~EXYNOS_BO_NONCONTIG;
 255                 DRM_WARN("Non-contiguous allocation is not supported without IOMMU, falling back to contiguous buffer\n");
 256         }
 257
 258         /* set memory type and cache attribute from user side. */
 259         exynos_gem->flags = flags;
 260
 261         ret = exynos_drm_alloc_buf(exynos_gem);
 262         if (ret < 0) {
 263                 drm_gem_object_release(&exynos_gem->base);
 264                 kfree(exynos_gem);
 265                 return ERR_PTR(ret);
 266         }
 267
 268         return exynos_gem;
 269 }
 270
 271 int exynos_drm_gem_create_ioctl(struct drm_device *dev, void *data,
 272                                 struct drm_file *file_priv)
 273 {
 274         struct drm_exynos_gem_create *args = data;
 275         struct exynos_drm_gem *exynos_gem;
 276         int ret;
 277
 278         exynos_gem = exynos_drm_gem_create(dev, args->flags, args->size);
 279         if (IS_ERR(exynos_gem))
 280                 return PTR_ERR(exynos_gem);
 281
 282         ret = exynos_drm_gem_handle_create(&exynos_gem->base, file_priv,
 283                                            &args->handle);
 284         if (ret) {
 285                 exynos_drm_gem_destroy(exynos_gem);
 286                 return ret;
 287         }
 288
 289         return 0;
 290 }
 291
 292 int exynos_drm_gem_map_ioctl(struct drm_device *dev, void *data,
 293                              struct drm_file *file_priv)
 294 {
 295         struct drm_exynos_gem_map *args = data;
 296
 297         return exynos_drm_gem_dumb_map_offset(file_priv, dev, args->handle,
 298                                               &args->offset);
 299 }
 300
 301 dma_addr_t *exynos_drm_gem_get_dma_addr(struct drm_device *dev,
 302                                         unsigned int gem_handle,
 303                                         struct drm_file *filp)
 304 {
 305         struct exynos_drm_gem *exynos_gem;
 306         struct drm_gem_object *obj;
 307
 308         obj = drm_gem_object_lookup(filp, gem_handle);
 309         if (!obj) {
 310                 DRM_ERROR("failed to lookup gem object.\n");
 311                 return ERR_PTR(-EINVAL);
 312         }
 313
 314         exynos_gem = to_exynos_gem(obj);
 315
 316         return &exynos_gem->dma_addr;
 317 }
 318
 319 void exynos_drm_gem_put_dma_addr(struct drm_device *dev,
 320                                         unsigned int gem_handle,
 321                                         struct drm_file *filp)
 322 {
 323         struct drm_gem_object *obj;
 324
 325         obj = drm_gem_object_lookup(filp, gem_handle);
 326         if (!obj) {
 327                 DRM_ERROR("failed to lookup gem object.\n");
 328                 return;
 329         }
 330
 331         drm_gem_object_unreference_unlocked(obj);
 332
 333         /*
 334          * decrease obj->refcount one more time because we has already
 335          * increased it at exynos_drm_gem_get_dma_addr().
 336          */
 337         drm_gem_object_unreference_unlocked(obj);
 338 }
 339
 340 static int exynos_drm_gem_mmap_buffer(struct exynos_drm_gem *exynos_gem,
 341                                       struct vm_area_struct *vma)
 342 {
 343         struct drm_device *drm_dev = exynos_gem->base.dev;
 344         unsigned long vm_size;
 345         int ret;
 346
 347         vma->vm_flags &= ~VM_PFNMAP;
 348         vma->vm_pgoff = 0;
 349
 350         vm_size = vma->vm_end - vma->vm_start;
 351
 352         /* check if user-requested size is valid. */
 353         if (vm_size > exynos_gem->size)
 354                 return -EINVAL;
 355
 356         ret = dma_mmap_attrs(to_dma_dev(drm_dev), vma, exynos_gem->cookie,
 357                              exynos_gem->dma_addr, exynos_gem->size,
 358                              exynos_gem->dma_attrs);
 359         if (ret < 0) {
 360                 DRM_ERROR("failed to mmap.\n");
 361                 return ret;
 362         }
 363
 364         return 0;
 365 }
 366
 367 int exynos_drm_gem_get_ioctl(struct drm_device *dev, void *data,
 368                                       struct drm_file *file_priv)
 369 {
 370         struct exynos_drm_gem *exynos_gem;
 371         struct drm_exynos_gem_info *args = data;
 372         struct drm_gem_object *obj;
 373
 374         obj = drm_gem_object_lookup(file_priv, args->handle);
 375         if (!obj) {
 376                 DRM_ERROR("failed to lookup gem object.\n");
 377                 return -EINVAL;
 378         }
 379
 380         exynos_gem = to_exynos_gem(obj);
 381
 382         args->flags = exynos_gem->flags;
 383         args->size = exynos_gem->size;
 384
 385         drm_gem_object_unreference_unlocked(obj);
 386
 387         return 0;
 388 }
 389
 390 void exynos_drm_gem_free_object(struct drm_gem_object *obj)
 391 {
 392         exynos_drm_gem_destroy(to_exynos_gem(obj));
 393 }
 394
 395 int exynos_drm_gem_dumb_create(struct drm_file *file_priv,
 396                                struct drm_device *dev,
 397                                struct drm_mode_create_dumb *args)
 398 {
 399         struct exynos_drm_gem *exynos_gem;
 400         unsigned int flags;
 401         int ret;
 402
 403         /*
 404          * allocate memory to be used for framebuffer.
 405          * - this callback would be called by user application
 406          *      with DRM_IOCTL_MODE_CREATE_DUMB command.
 407          */
 408
 409         args->pitch = args->width * ((args->bpp + 7) / 8);
 410         args->size = args->pitch * args->height;
 411
 412         if (is_drm_iommu_supported(dev))
 413                 flags = EXYNOS_BO_NONCONTIG | EXYNOS_BO_WC;
 414         else
 415                 flags = EXYNOS_BO_CONTIG | EXYNOS_BO_WC;
 416
 417         exynos_gem = exynos_drm_gem_create(dev, flags, args->size);
 418         if (IS_ERR(exynos_gem)) {
 419                 dev_warn(dev->dev, "FB allocation failed.\n");
 420                 return PTR_ERR(exynos_gem);
 421         }
 422
 423         ret = exynos_drm_gem_handle_create(&exynos_gem->base, file_priv,
 424                                            &args->handle);
 425         if (ret) {
 426                 exynos_drm_gem_destroy(exynos_gem);
 427                 return ret;
 428         }
 429
 430         return 0;
 431 }
 432
 433 int exynos_drm_gem_dumb_map_offset(struct drm_file *file_priv,
 434                                    struct drm_device *dev, uint32_t handle,
 435                                    uint64_t *offset)
 436 {
 437         struct drm_gem_object *obj;
 438         int ret = 0;
 439
 440         /*
 441          * get offset of memory allocated for drm framebuffer.
 442          * - this callback would be called by user application
 443          *      with DRM_IOCTL_MODE_MAP_DUMB command.
 444          */
 445
 446         obj = drm_gem_object_lookup(file_priv, handle);
 447         if (!obj) {
 448                 DRM_ERROR("failed to lookup gem object.\n");
 449                 return -EINVAL;
 450         }
 451
 452         *offset = drm_vma_node_offset_addr(&obj->vma_node);
 453         DRM_DEBUG_KMS("offset = 0x%lx\n", (unsigned long)*offset);
 454
 455         drm_gem_object_unreference_unlocked(obj);
 456         return ret;
 457 }
 458
 459 int exynos_drm_gem_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
 460 {
 461         struct drm_gem_object *obj = vma->vm_private_data;
 462         struct exynos_drm_gem *exynos_gem = to_exynos_gem(obj);
 463         unsigned long pfn;
 464         pgoff_t page_offset;
 465         int ret;
 466
 467         page_offset = ((unsigned long)vmf->virtual_address -
 468                         vma->vm_start) >> PAGE_SHIFT;
 469
 470         if (page_offset >= (exynos_gem->size >> PAGE_SHIFT)) {
 471                 DRM_ERROR("invalid page offset\n");
 472                 ret = -EINVAL;
 473                 goto out;
 474         }
 475
 476         pfn = page_to_pfn(exynos_gem->pages[page_offset]);
 477         ret = vm_insert_mixed(vma, (unsigned long)vmf->virtual_address,
 478                         __pfn_to_pfn_t(pfn, PFN_DEV));
 479
 480 out:
 481         switch (ret) {
 482         case 0:
 483         case -ERESTARTSYS:
 484         case -EINTR:
 485                 return VM_FAULT_NOPAGE;
 486         case -ENOMEM:
 487                 return VM_FAULT_OOM;
 488         default:
 489                 return VM_FAULT_SIGBUS;
 490         }
 491 }
 492
 493 static int exynos_drm_gem_mmap_obj(struct drm_gem_object *obj,
 494                                    struct vm_area_struct *vma)
 495 {
 496         struct exynos_drm_gem *exynos_gem = to_exynos_gem(obj);
 497         int ret;
 498
 499         DRM_DEBUG_KMS("flags = 0x%x\n", exynos_gem->flags);
 500
 501         /* non-cachable as default. */
 502         if (exynos_gem->flags & EXYNOS_BO_CACHABLE)
 503                 vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
 504         else if (exynos_gem->flags & EXYNOS_BO_WC)
 505                 vma->vm_page_prot =
 506                         pgprot_writecombine(vm_get_page_prot(vma->vm_flags));
 507         else
 508                 vma->vm_page_prot =
 509                         pgprot_noncached(vm_get_page_prot(vma->vm_flags));
 510
 511         ret = exynos_drm_gem_mmap_buffer(exynos_gem, vma);
 512         if (ret)
 513                 goto err_close_vm;
 514
 515         return ret;
 516
 517 err_close_vm:
 518         drm_gem_vm_close(vma);
 519
 520         return ret;
 521 }
 522
 523 int exynos_drm_gem_mmap(struct file *filp, struct vm_area_struct *vma)
 524 {
 525         struct drm_gem_object *obj;
 526         int ret;
 527
 528         /* set vm_area_struct. */
 529         ret = drm_gem_mmap(filp, vma);
 530         if (ret < 0) {
 531                 DRM_ERROR("failed to mmap.\n");
 532                 return ret;
 533         }
 534
 535         obj = vma->vm_private_data;
 536
 537         if (obj->import_attach)
 538                 return dma_buf_mmap(obj->dma_buf, vma, 0);
 539
 540         return exynos_drm_gem_mmap_obj(obj, vma);
 541 }
 542
 543 /* low-level interface prime helpers */
 544 struct sg_table *exynos_drm_gem_prime_get_sg_table(struct drm_gem_object *obj)
 545 {
 546         struct exynos_drm_gem *exynos_gem = to_exynos_gem(obj);
 547         int npages;
 548
 549         npages = exynos_gem->size >> PAGE_SHIFT;
 550
 551         return drm_prime_pages_to_sg(exynos_gem->pages, npages);
 552 }
 553
 554 struct drm_gem_object *
 555 exynos_drm_gem_prime_import_sg_table(struct drm_device *dev,
 556                                      struct dma_buf_attachment *attach,
 557                                      struct sg_table *sgt)
 558 {
 559         struct exynos_drm_gem *exynos_gem;
 560         int npages;
 561         int ret;
 562
 563         exynos_gem = exynos_drm_gem_init(dev, attach->dmabuf->size);
 564         if (IS_ERR(exynos_gem)) {
 565                 ret = PTR_ERR(exynos_gem);
 566                 return ERR_PTR(ret);
 567         }
 568
 569         exynos_gem->dma_addr = sg_dma_address(sgt->sgl);
 570
 571         npages = exynos_gem->size >> PAGE_SHIFT;
 572         exynos_gem->pages = drm_malloc_ab(npages, sizeof(struct page *));
 573         if (!exynos_gem->pages) {
 574                 ret = -ENOMEM;
 575                 goto err;
 576         }
 577
 578         ret = drm_prime_sg_to_page_addr_arrays(sgt, exynos_gem->pages, NULL,
 579                                                npages);
 580         if (ret < 0)
 581                 goto err_free_large;
 582
 583         exynos_gem->sgt = sgt;
 584
 585         if (sgt->nents == 1) {
 586                 /* always physically continuous memory if sgt->nents is 1. */
 587                 exynos_gem->flags |= EXYNOS_BO_CONTIG;
 588         } else {
 589                 /*
 590                  * this case could be CONTIG or NONCONTIG type but for now
 591                  * sets NONCONTIG.
 592                  * TODO. we have to find a way that exporter can notify
 593                  * the type of its own buffer to importer.
 594                  */
 595                 exynos_gem->flags |= EXYNOS_BO_NONCONTIG;
 596         }
 597
 598         return &exynos_gem->base;
 599
 600 err_free_large:
 601         drm_free_large(exynos_gem->pages);
 602 err:
 603         drm_gem_object_release(&exynos_gem->base);
 604         kfree(exynos_gem);
 605         return ERR_PTR(ret);
 606 }
 607
 608 void *exynos_drm_gem_prime_vmap(struct drm_gem_object *obj)
 609 {
 610         return NULL;
 611 }
 612
 613 void exynos_drm_gem_prime_vunmap(struct drm_gem_object *obj, void *vaddr)
 614 {
 615         /* Nothing to do */
 616 }
 617
 618 int exynos_drm_gem_prime_mmap(struct drm_gem_object *obj,
 619                               struct vm_area_struct *vma)
 620 {
 621         int ret;
 622
 623         ret = drm_gem_mmap_obj(obj, obj->size, vma);
 624         if (ret < 0)
 625                 return ret;
 626
 627         return exynos_drm_gem_mmap_obj(obj, vma);
 628 }