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 = 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 }