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_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 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_fault(struct vm_fault *vmf)
 426 {
 427         struct vm_area_struct *vma = vmf->vma;
 428         struct drm_gem_object *obj = vma->vm_private_data;
 429         struct exynos_drm_gem *exynos_gem = to_exynos_gem(obj);
 430         unsigned long pfn;
 431         pgoff_t page_offset;
 432         int ret;
 433
 434         page_offset = (vmf->address - vma->vm_start) >> PAGE_SHIFT;
 435
 436         if (page_offset >= (exynos_gem->size >> PAGE_SHIFT)) {
 437                 DRM_ERROR("invalid page offset\n");
 438                 ret = -EINVAL;
 439                 goto out;
 440         }
 441
 442         pfn = page_to_pfn(exynos_gem->pages[page_offset]);
 443         ret = vm_insert_mixed(vma, vmf->address, __pfn_to_pfn_t(pfn, PFN_DEV));
 444
 445 out:
 446         switch (ret) {
 447         case 0:
 448         case -ERESTARTSYS:
 449         case -EINTR:
 450                 return VM_FAULT_NOPAGE;
 451         case -ENOMEM:
 452                 return VM_FAULT_OOM;
 453         default:
 454                 return VM_FAULT_SIGBUS;
 455         }
 456 }
 457
 458 static int exynos_drm_gem_mmap_obj(struct drm_gem_object *obj,
 459                                    struct vm_area_struct *vma)
 460 {
 461         struct exynos_drm_gem *exynos_gem = to_exynos_gem(obj);
 462         int ret;
 463
 464         DRM_DEBUG_KMS("flags = 0x%x\n", exynos_gem->flags);
 465
 466         /* non-cachable as default. */
 467         if (exynos_gem->flags & EXYNOS_BO_CACHABLE)
 468                 vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
 469         else if (exynos_gem->flags & EXYNOS_BO_WC)
 470                 vma->vm_page_prot =
 471                         pgprot_writecombine(vm_get_page_prot(vma->vm_flags));
 472         else
 473                 vma->vm_page_prot =
 474                         pgprot_noncached(vm_get_page_prot(vma->vm_flags));
 475
 476         ret = exynos_drm_gem_mmap_buffer(exynos_gem, vma);
 477         if (ret)
 478                 goto err_close_vm;
 479
 480         return ret;
 481
 482 err_close_vm:
 483         drm_gem_vm_close(vma);
 484
 485         return ret;
 486 }
 487
 488 int exynos_drm_gem_mmap(struct file *filp, struct vm_area_struct *vma)
 489 {
 490         struct drm_gem_object *obj;
 491         int ret;
 492
 493         /* set vm_area_struct. */
 494         ret = drm_gem_mmap(filp, vma);
 495         if (ret < 0) {
 496                 DRM_ERROR("failed to mmap.\n");
 497                 return ret;
 498         }
 499
 500         obj = vma->vm_private_data;
 501
 502         if (obj->import_attach)
 503                 return dma_buf_mmap(obj->dma_buf, vma, 0);
 504
 505         return exynos_drm_gem_mmap_obj(obj, vma);
 506 }
 507
 508 /* low-level interface prime helpers */
 509 struct sg_table *exynos_drm_gem_prime_get_sg_table(struct drm_gem_object *obj)
 510 {
 511         struct exynos_drm_gem *exynos_gem = to_exynos_gem(obj);
 512         int npages;
 513
 514         npages = exynos_gem->size >> PAGE_SHIFT;
 515
 516         return drm_prime_pages_to_sg(exynos_gem->pages, npages);
 517 }
 518
 519 struct drm_gem_object *
 520 exynos_drm_gem_prime_import_sg_table(struct drm_device *dev,
 521                                      struct dma_buf_attachment *attach,
 522                                      struct sg_table *sgt)
 523 {
 524         struct exynos_drm_gem *exynos_gem;
 525         int npages;
 526         int ret;
 527
 528         exynos_gem = exynos_drm_gem_init(dev, attach->dmabuf->size);
 529         if (IS_ERR(exynos_gem)) {
 530                 ret = PTR_ERR(exynos_gem);
 531                 return ERR_PTR(ret);
 532         }
 533
 534         exynos_gem->dma_addr = sg_dma_address(sgt->sgl);
 535
 536         npages = exynos_gem->size >> PAGE_SHIFT;
 537         exynos_gem->pages = kvmalloc_array(npages, sizeof(struct page *), GFP_KERNEL);
 538         if (!exynos_gem->pages) {
 539                 ret = -ENOMEM;
 540                 goto err;
 541         }
 542
 543         ret = drm_prime_sg_to_page_addr_arrays(sgt, exynos_gem->pages, NULL,
 544                                                npages);
 545         if (ret < 0)
 546                 goto err_free_large;
 547
 548         exynos_gem->sgt = sgt;
 549
 550         if (sgt->nents == 1) {
 551                 /* always physically continuous memory if sgt->nents is 1. */
 552                 exynos_gem->flags |= EXYNOS_BO_CONTIG;
 553         } else {
 554                 /*
 555                  * this case could be CONTIG or NONCONTIG type but for now
 556                  * sets NONCONTIG.
 557                  * TODO. we have to find a way that exporter can notify
 558                  * the type of its own buffer to importer.
 559                  */
 560                 exynos_gem->flags |= EXYNOS_BO_NONCONTIG;
 561         }
 562
 563         return &exynos_gem->base;
 564
 565 err_free_large:
 566         kvfree(exynos_gem->pages);
 567 err:
 568         drm_gem_object_release(&exynos_gem->base);
 569         kfree(exynos_gem);
 570         return ERR_PTR(ret);
 571 }
 572
 573 void *exynos_drm_gem_prime_vmap(struct drm_gem_object *obj)
 574 {
 575         return NULL;
 576 }
 577
 578 void exynos_drm_gem_prime_vunmap(struct drm_gem_object *obj, void *vaddr)
 579 {
 580         /* Nothing to do */
 581 }
 582
 583 int exynos_drm_gem_prime_mmap(struct drm_gem_object *obj,
 584                               struct vm_area_struct *vma)
 585 {
 586         int ret;
 587
 588         ret = drm_gem_mmap_obj(obj, obj->size, vma);
 589         if (ret < 0)
 590                 return ret;
 591
 592         return exynos_drm_gem_mmap_obj(obj, vma);
 593 }