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