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 <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
  23 static int check_gem_flags(unsigned int flags)
  24 {
  25         if (flags & ~(EXYNOS_BO_MASK)) {
  26                 DRM_ERROR("invalid flags.\n");
  27                 return -EINVAL;
  28         }
  29
  30         return 0;
  31 }
  32
  33 static void update_vm_cache_attr(struct exynos_drm_gem_obj *obj,
  34                                         struct vm_area_struct *vma)
  35 {
  36         DRM_DEBUG_KMS("flags = 0x%x\n", obj->flags);
  37
  38         /* non-cachable as default. */
  39         if (obj->flags & EXYNOS_BO_CACHABLE)
  40                 vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
  41         else if (obj->flags & EXYNOS_BO_WC)
  42                 vma->vm_page_prot =
  43                         pgprot_writecombine(vm_get_page_prot(vma->vm_flags));
  44         else
  45                 vma->vm_page_prot =
  46                         pgprot_noncached(vm_get_page_prot(vma->vm_flags));
  47 }
  48
  49 static unsigned long roundup_gem_size(unsigned long size, unsigned int flags)
  50 {
  51         /* TODO */
  52
  53         return roundup(size, PAGE_SIZE);
  54 }
  55
  56 static int exynos_drm_gem_handle_create(struct drm_gem_object *obj,
  57                                         struct drm_file *file_priv,
  58                                         unsigned int *handle)
  59 {
  60         int ret;
  61
  62         /*
  63          * allocate a id of idr table where the obj is registered
  64          * and handle has the id what user can see.
  65          */
  66         ret = drm_gem_handle_create(file_priv, obj, handle);
  67         if (ret)
  68                 return ret;
  69
  70         DRM_DEBUG_KMS("gem handle = 0x%x\n", *handle);
  71
  72         /* drop reference from allocate - handle holds it now. */
  73         drm_gem_object_unreference_unlocked(obj);
  74
  75         return 0;
  76 }
  77
  78 void exynos_drm_gem_destroy(struct exynos_drm_gem_obj *exynos_gem_obj)
  79 {
  80         struct drm_gem_object *obj;
  81         struct exynos_drm_gem_buf *buf;
  82
  83         obj = &exynos_gem_obj->base;
  84         buf = exynos_gem_obj->buffer;
  85
  86         DRM_DEBUG_KMS("handle count = %d\n", obj->handle_count);
  87
  88         /*
  89          * do not release memory region from exporter.
  90          *
  91          * the region will be released by exporter
  92          * once dmabuf's refcount becomes 0.
  93          */
  94         if (obj->import_attach)
  95                 goto out;
  96
  97         exynos_drm_free_buf(obj->dev, exynos_gem_obj->flags, buf);
  98
  99 out:
 100         exynos_drm_fini_buf(obj->dev, buf);
 101         exynos_gem_obj->buffer = NULL;
 102
 103         drm_gem_free_mmap_offset(obj);
 104
 105         /* release file pointer to gem object. */
 106         drm_gem_object_release(obj);
 107
 108         kfree(exynos_gem_obj);
 109         exynos_gem_obj = NULL;
 110 }
 111
 112 unsigned long exynos_drm_gem_get_size(struct drm_device *dev,
 113                                                 unsigned int gem_handle,
 114                                                 struct drm_file *file_priv)
 115 {
 116         struct exynos_drm_gem_obj *exynos_gem_obj;
 117         struct drm_gem_object *obj;
 118
 119         obj = drm_gem_object_lookup(dev, file_priv, gem_handle);
 120         if (!obj) {
 121                 DRM_ERROR("failed to lookup gem object.\n");
 122                 return 0;
 123         }
 124
 125         exynos_gem_obj = to_exynos_gem_obj(obj);
 126
 127         drm_gem_object_unreference_unlocked(obj);
 128
 129         return exynos_gem_obj->buffer->size;
 130 }
 131
 132
 133 struct exynos_drm_gem_obj *exynos_drm_gem_init(struct drm_device *dev,
 134                                                       unsigned long size)
 135 {
 136         struct exynos_drm_gem_obj *exynos_gem_obj;
 137         struct drm_gem_object *obj;
 138         int ret;
 139
 140         exynos_gem_obj = kzalloc(sizeof(*exynos_gem_obj), GFP_KERNEL);
 141         if (!exynos_gem_obj)
 142                 return NULL;
 143
 144         exynos_gem_obj->size = size;
 145         obj = &exynos_gem_obj->base;
 146
 147         ret = drm_gem_object_init(dev, obj, size);
 148         if (ret < 0) {
 149                 DRM_ERROR("failed to initialize gem object\n");
 150                 kfree(exynos_gem_obj);
 151                 return NULL;
 152         }
 153
 154         DRM_DEBUG_KMS("created file object = 0x%x\n", (unsigned int)obj->filp);
 155
 156         return exynos_gem_obj;
 157 }
 158
 159 struct exynos_drm_gem_obj *exynos_drm_gem_create(struct drm_device *dev,
 160                                                 unsigned int flags,
 161                                                 unsigned long size)
 162 {
 163         struct exynos_drm_gem_obj *exynos_gem_obj;
 164         struct exynos_drm_gem_buf *buf;
 165         int ret;
 166
 167         if (!size) {
 168                 DRM_ERROR("invalid size.\n");
 169                 return ERR_PTR(-EINVAL);
 170         }
 171
 172         size = roundup_gem_size(size, flags);
 173
 174         ret = check_gem_flags(flags);
 175         if (ret)
 176                 return ERR_PTR(ret);
 177
 178         buf = exynos_drm_init_buf(dev, size);
 179         if (!buf)
 180                 return ERR_PTR(-ENOMEM);
 181
 182         exynos_gem_obj = exynos_drm_gem_init(dev, size);
 183         if (!exynos_gem_obj) {
 184                 ret = -ENOMEM;
 185                 goto err_fini_buf;
 186         }
 187
 188         exynos_gem_obj->buffer = buf;
 189
 190         /* set memory type and cache attribute from user side. */
 191         exynos_gem_obj->flags = flags;
 192
 193         ret = exynos_drm_alloc_buf(dev, buf, flags);
 194         if (ret < 0)
 195                 goto err_gem_fini;
 196
 197         return exynos_gem_obj;
 198
 199 err_gem_fini:
 200         drm_gem_object_release(&exynos_gem_obj->base);
 201         kfree(exynos_gem_obj);
 202 err_fini_buf:
 203         exynos_drm_fini_buf(dev, buf);
 204         return ERR_PTR(ret);
 205 }
 206
 207 int exynos_drm_gem_create_ioctl(struct drm_device *dev, void *data,
 208                                 struct drm_file *file_priv)
 209 {
 210         struct drm_exynos_gem_create *args = data;
 211         struct exynos_drm_gem_obj *exynos_gem_obj;
 212         int ret;
 213
 214         exynos_gem_obj = exynos_drm_gem_create(dev, args->flags, args->size);
 215         if (IS_ERR(exynos_gem_obj))
 216                 return PTR_ERR(exynos_gem_obj);
 217
 218         ret = exynos_drm_gem_handle_create(&exynos_gem_obj->base, file_priv,
 219                         &args->handle);
 220         if (ret) {
 221                 exynos_drm_gem_destroy(exynos_gem_obj);
 222                 return ret;
 223         }
 224
 225         return 0;
 226 }
 227
 228 dma_addr_t *exynos_drm_gem_get_dma_addr(struct drm_device *dev,
 229                                         unsigned int gem_handle,
 230                                         struct drm_file *filp)
 231 {
 232         struct exynos_drm_gem_obj *exynos_gem_obj;
 233         struct drm_gem_object *obj;
 234
 235         obj = drm_gem_object_lookup(dev, filp, gem_handle);
 236         if (!obj) {
 237                 DRM_ERROR("failed to lookup gem object.\n");
 238                 return ERR_PTR(-EINVAL);
 239         }
 240
 241         exynos_gem_obj = to_exynos_gem_obj(obj);
 242
 243         return &exynos_gem_obj->buffer->dma_addr;
 244 }
 245
 246 void exynos_drm_gem_put_dma_addr(struct drm_device *dev,
 247                                         unsigned int gem_handle,
 248                                         struct drm_file *filp)
 249 {
 250         struct drm_gem_object *obj;
 251
 252         obj = drm_gem_object_lookup(dev, filp, gem_handle);
 253         if (!obj) {
 254                 DRM_ERROR("failed to lookup gem object.\n");
 255                 return;
 256         }
 257
 258         drm_gem_object_unreference_unlocked(obj);
 259
 260         /*
 261          * decrease obj->refcount one more time because we has already
 262          * increased it at exynos_drm_gem_get_dma_addr().
 263          */
 264         drm_gem_object_unreference_unlocked(obj);
 265 }
 266
 267 int exynos_drm_gem_mmap_buffer(struct exynos_drm_gem_obj *exynos_gem_obj,
 268                                       struct vm_area_struct *vma)
 269 {
 270         struct drm_device *drm_dev = exynos_gem_obj->base.dev;
 271         struct exynos_drm_gem_buf *buffer;
 272         unsigned long vm_size;
 273         int ret;
 274
 275         vma->vm_flags &= ~VM_PFNMAP;
 276         vma->vm_pgoff = 0;
 277
 278         vm_size = vma->vm_end - vma->vm_start;
 279
 280         /*
 281          * a buffer contains information to physically continuous memory
 282          * allocated by user request or at framebuffer creation.
 283          */
 284         buffer = exynos_gem_obj->buffer;
 285
 286         /* check if user-requested size is valid. */
 287         if (vm_size > buffer->size)
 288                 return -EINVAL;
 289
 290         ret = dma_mmap_attrs(drm_dev->dev, vma, buffer->pages,
 291                                 buffer->dma_addr, buffer->size,
 292                                 &buffer->dma_attrs);
 293         if (ret < 0) {
 294                 DRM_ERROR("failed to mmap.\n");
 295                 return ret;
 296         }
 297
 298         return 0;
 299 }
 300
 301 int exynos_drm_gem_get_ioctl(struct drm_device *dev, void *data,
 302                                       struct drm_file *file_priv)
 303 {       struct exynos_drm_gem_obj *exynos_gem_obj;
 304         struct drm_exynos_gem_info *args = data;
 305         struct drm_gem_object *obj;
 306
 307         mutex_lock(&dev->struct_mutex);
 308
 309         obj = drm_gem_object_lookup(dev, file_priv, args->handle);
 310         if (!obj) {
 311                 DRM_ERROR("failed to lookup gem object.\n");
 312                 mutex_unlock(&dev->struct_mutex);
 313                 return -EINVAL;
 314         }
 315
 316         exynos_gem_obj = to_exynos_gem_obj(obj);
 317
 318         args->flags = exynos_gem_obj->flags;
 319         args->size = exynos_gem_obj->size;
 320
 321         drm_gem_object_unreference(obj);
 322         mutex_unlock(&dev->struct_mutex);
 323
 324         return 0;
 325 }
 326
 327 struct vm_area_struct *exynos_gem_get_vma(struct vm_area_struct *vma)
 328 {
 329         struct vm_area_struct *vma_copy;
 330
 331         vma_copy = kmalloc(sizeof(*vma_copy), GFP_KERNEL);
 332         if (!vma_copy)
 333                 return NULL;
 334
 335         if (vma->vm_ops && vma->vm_ops->open)
 336                 vma->vm_ops->open(vma);
 337
 338         if (vma->vm_file)
 339                 get_file(vma->vm_file);
 340
 341         memcpy(vma_copy, vma, sizeof(*vma));
 342
 343         vma_copy->vm_mm = NULL;
 344         vma_copy->vm_next = NULL;
 345         vma_copy->vm_prev = NULL;
 346
 347         return vma_copy;
 348 }
 349
 350 void exynos_gem_put_vma(struct vm_area_struct *vma)
 351 {
 352         if (!vma)
 353                 return;
 354
 355         if (vma->vm_ops && vma->vm_ops->close)
 356                 vma->vm_ops->close(vma);
 357
 358         if (vma->vm_file)
 359                 fput(vma->vm_file);
 360
 361         kfree(vma);
 362 }
 363
 364 int exynos_gem_get_pages_from_userptr(unsigned long start,
 365                                                 unsigned int npages,
 366                                                 struct page **pages,
 367                                                 struct vm_area_struct *vma)
 368 {
 369         int get_npages;
 370
 371         /* the memory region mmaped with VM_PFNMAP. */
 372         if (vma_is_io(vma)) {
 373                 unsigned int i;
 374
 375                 for (i = 0; i < npages; ++i, start += PAGE_SIZE) {
 376                         unsigned long pfn;
 377                         int ret = follow_pfn(vma, start, &pfn);
 378                         if (ret)
 379                                 return ret;
 380
 381                         pages[i] = pfn_to_page(pfn);
 382                 }
 383
 384                 if (i != npages) {
 385                         DRM_ERROR("failed to get user_pages.\n");
 386                         return -EINVAL;
 387                 }
 388
 389                 return 0;
 390         }
 391
 392         get_npages = get_user_pages(current, current->mm, start,
 393                                         npages, 1, 1, pages, NULL);
 394         get_npages = max(get_npages, 0);
 395         if (get_npages != npages) {
 396                 DRM_ERROR("failed to get user_pages.\n");
 397                 while (get_npages)
 398                         put_page(pages[--get_npages]);
 399                 return -EFAULT;
 400         }
 401
 402         return 0;
 403 }
 404
 405 void exynos_gem_put_pages_to_userptr(struct page **pages,
 406                                         unsigned int npages,
 407                                         struct vm_area_struct *vma)
 408 {
 409         if (!vma_is_io(vma)) {
 410                 unsigned int i;
 411
 412                 for (i = 0; i < npages; i++) {
 413                         set_page_dirty_lock(pages[i]);
 414
 415                         /*
 416                          * undo the reference we took when populating
 417                          * the table.
 418                          */
 419                         put_page(pages[i]);
 420                 }
 421         }
 422 }
 423
 424 int exynos_gem_map_sgt_with_dma(struct drm_device *drm_dev,
 425                                 struct sg_table *sgt,
 426                                 enum dma_data_direction dir)
 427 {
 428         int nents;
 429
 430         mutex_lock(&drm_dev->struct_mutex);
 431
 432         nents = dma_map_sg(drm_dev->dev, sgt->sgl, sgt->nents, dir);
 433         if (!nents) {
 434                 DRM_ERROR("failed to map sgl with dma.\n");
 435                 mutex_unlock(&drm_dev->struct_mutex);
 436                 return nents;
 437         }
 438
 439         mutex_unlock(&drm_dev->struct_mutex);
 440         return 0;
 441 }
 442
 443 void exynos_gem_unmap_sgt_from_dma(struct drm_device *drm_dev,
 444                                 struct sg_table *sgt,
 445                                 enum dma_data_direction dir)
 446 {
 447         dma_unmap_sg(drm_dev->dev, sgt->sgl, sgt->nents, dir);
 448 }
 449
 450 void exynos_drm_gem_free_object(struct drm_gem_object *obj)
 451 {
 452         struct exynos_drm_gem_obj *exynos_gem_obj;
 453         struct exynos_drm_gem_buf *buf;
 454
 455         exynos_gem_obj = to_exynos_gem_obj(obj);
 456         buf = exynos_gem_obj->buffer;
 457
 458         exynos_drm_gem_destroy(to_exynos_gem_obj(obj));
 459 }
 460
 461 int exynos_drm_gem_dumb_create(struct drm_file *file_priv,
 462                                struct drm_device *dev,
 463                                struct drm_mode_create_dumb *args)
 464 {
 465         struct exynos_drm_gem_obj *exynos_gem_obj;
 466         int ret;
 467
 468         /*
 469          * allocate memory to be used for framebuffer.
 470          * - this callback would be called by user application
 471          *      with DRM_IOCTL_MODE_CREATE_DUMB command.
 472          */
 473
 474         args->pitch = args->width * ((args->bpp + 7) / 8);
 475         args->size = args->pitch * args->height;
 476
 477         if (is_drm_iommu_supported(dev)) {
 478                 exynos_gem_obj = exynos_drm_gem_create(dev,
 479                         EXYNOS_BO_NONCONTIG | EXYNOS_BO_WC,
 480                         args->size);
 481         } else {
 482                 exynos_gem_obj = exynos_drm_gem_create(dev,
 483                         EXYNOS_BO_CONTIG | EXYNOS_BO_WC,
 484                         args->size);
 485         }
 486
 487         if (IS_ERR(exynos_gem_obj)) {
 488                 dev_warn(dev->dev, "FB allocation failed.\n");
 489                 return PTR_ERR(exynos_gem_obj);
 490         }
 491
 492         ret = exynos_drm_gem_handle_create(&exynos_gem_obj->base, file_priv,
 493                         &args->handle);
 494         if (ret) {
 495                 exynos_drm_gem_destroy(exynos_gem_obj);
 496                 return ret;
 497         }
 498
 499         return 0;
 500 }
 501
 502 int exynos_drm_gem_dumb_map_offset(struct drm_file *file_priv,
 503                                    struct drm_device *dev, uint32_t handle,
 504                                    uint64_t *offset)
 505 {
 506         struct drm_gem_object *obj;
 507         int ret = 0;
 508
 509         mutex_lock(&dev->struct_mutex);
 510
 511         /*
 512          * get offset of memory allocated for drm framebuffer.
 513          * - this callback would be called by user application
 514          *      with DRM_IOCTL_MODE_MAP_DUMB command.
 515          */
 516
 517         obj = drm_gem_object_lookup(dev, file_priv, handle);
 518         if (!obj) {
 519                 DRM_ERROR("failed to lookup gem object.\n");
 520                 ret = -EINVAL;
 521                 goto unlock;
 522         }
 523
 524         ret = drm_gem_create_mmap_offset(obj);
 525         if (ret)
 526                 goto out;
 527
 528         *offset = drm_vma_node_offset_addr(&obj->vma_node);
 529         DRM_DEBUG_KMS("offset = 0x%lx\n", (unsigned long)*offset);
 530
 531 out:
 532         drm_gem_object_unreference(obj);
 533 unlock:
 534         mutex_unlock(&dev->struct_mutex);
 535         return ret;
 536 }
 537
 538 int exynos_drm_gem_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
 539 {
 540         struct drm_gem_object *obj = vma->vm_private_data;
 541         struct exynos_drm_gem_obj *exynos_gem_obj = to_exynos_gem_obj(obj);
 542         struct exynos_drm_gem_buf *buf = exynos_gem_obj->buffer;
 543         unsigned long pfn;
 544         pgoff_t page_offset;
 545         int ret;
 546
 547         page_offset = ((unsigned long)vmf->virtual_address -
 548                         vma->vm_start) >> PAGE_SHIFT;
 549
 550         if (page_offset >= (buf->size >> PAGE_SHIFT)) {
 551                 DRM_ERROR("invalid page offset\n");
 552                 ret = -EINVAL;
 553                 goto out;
 554         }
 555
 556         pfn = page_to_pfn(buf->pages[page_offset]);
 557         ret = vm_insert_mixed(vma, (unsigned long)vmf->virtual_address, pfn);
 558
 559 out:
 560         switch (ret) {
 561         case 0:
 562         case -ERESTARTSYS:
 563         case -EINTR:
 564                 return VM_FAULT_NOPAGE;
 565         case -ENOMEM:
 566                 return VM_FAULT_OOM;
 567         default:
 568                 return VM_FAULT_SIGBUS;
 569         }
 570 }
 571
 572 int exynos_drm_gem_mmap(struct file *filp, struct vm_area_struct *vma)
 573 {
 574         struct exynos_drm_gem_obj *exynos_gem_obj;
 575         struct drm_gem_object *obj;
 576         int ret;
 577
 578         /* set vm_area_struct. */
 579         ret = drm_gem_mmap(filp, vma);
 580         if (ret < 0) {
 581                 DRM_ERROR("failed to mmap.\n");
 582                 return ret;
 583         }
 584
 585         obj = vma->vm_private_data;
 586         exynos_gem_obj = to_exynos_gem_obj(obj);
 587
 588         ret = check_gem_flags(exynos_gem_obj->flags);
 589         if (ret)
 590                 goto err_close_vm;
 591
 592         update_vm_cache_attr(exynos_gem_obj, vma);
 593
 594         ret = exynos_drm_gem_mmap_buffer(exynos_gem_obj, vma);
 595         if (ret)
 596                 goto err_close_vm;
 597
 598         return ret;
 599
 600 err_close_vm:
 601         drm_gem_vm_close(vma);
 602         drm_gem_free_mmap_offset(obj);
 603
 604         return ret;
 605 }