LXR linux/drivers/gpu/drm/exynos/exynos_drm

   1/* exynos_drm_gem.h
   2 *
   3 * Copyright (c) 2011 Samsung Electronics Co., Ltd.
   4 * Authoer: 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#ifndef _EXYNOS_DRM_GEM_H_
  13#define _EXYNOS_DRM_GEM_H_
  14
  15#include <drm/drm_gem.h>
  16
  17#define to_exynos_gem(x)        container_of(x, struct exynos_drm_gem, base)
  18
  19#define IS_NONCONTIG_BUFFER(f)          (f & EXYNOS_BO_NONCONTIG)
  20
  21/*
  22 * exynos drm buffer structure.
  23 *
  24 * @base: a gem object.
  25 *      - a new handle to this gem object would be created
  26 *      by drm_gem_handle_create().
  27 * @buffer: a pointer to exynos_drm_gem_buffer object.
  28 *      - contain the information to memory region allocated
  29 *      by user request or at framebuffer creation.
  30 *      continuous memory region allocated by user request
  31 *      or at framebuffer creation.
  32 * @flags: indicate memory type to allocated buffer and cache attruibute.
  33 * @size: size requested from user, in bytes and this size is aligned
  34 *      in page unit.
  35 * @cookie: cookie returned by dma_alloc_attrs
  36 * @kvaddr: kernel virtual address to allocated memory region.
  37 * @dma_addr: bus address(accessed by dma) to allocated memory region.
  38 *      - this address could be physical address without IOMMU and
  39 *      device address with IOMMU.
  40 * @pages: Array of backing pages.
  41 * @sgt: Imported sg_table.
  42 *
  43 * P.S. this object would be transferred to user as kms_bo.handle so
  44 *      user can access the buffer through kms_bo.handle.
  45 */
  46struct exynos_drm_gem {
  47        struct drm_gem_object   base;
  48        unsigned int            flags;
  49        unsigned long           size;
  50        void                    *cookie;
  51        void __iomem            *kvaddr;
  52        dma_addr_t              dma_addr;
  53        unsigned long           dma_attrs;
  54        struct page             **pages;
  55        struct sg_table         *sgt;
  56};
  57
  58/* destroy a buffer with gem object */
  59void exynos_drm_gem_destroy(struct exynos_drm_gem *exynos_gem);
  60
  61/* create a new buffer with gem object */
  62struct exynos_drm_gem *exynos_drm_gem_create(struct drm_device *dev,
  63                                             unsigned int flags,
  64                                             unsigned long size);
  65
  66/*
  67 * request gem object creation and buffer allocation as the size
  68 * that it is calculated with framebuffer information such as width,
  69 * height and bpp.
  70 */
  71int exynos_drm_gem_create_ioctl(struct drm_device *dev, void *data,
  72                                struct drm_file *file_priv);
  73
  74/* get fake-offset of gem object that can be used with mmap. */
  75int exynos_drm_gem_map_ioctl(struct drm_device *dev, void *data,
  76                             struct drm_file *file_priv);
  77
  78/*
  79 * get dma address from gem handle and this function could be used for
  80 * other drivers such as 2d/3d acceleration drivers.
  81 * with this function call, gem object reference count would be increased.
  82 */
  83dma_addr_t *exynos_drm_gem_get_dma_addr(struct drm_device *dev,
  84                                        unsigned int gem_handle,
  85                                        struct drm_file *filp);
  86
  87/*
  88 * put dma address from gem handle and this function could be used for
  89 * other drivers such as 2d/3d acceleration drivers.
  90 * with this function call, gem object reference count would be decreased.
  91 */
  92void exynos_drm_gem_put_dma_addr(struct drm_device *dev,
  93                                        unsigned int gem_handle,
  94                                        struct drm_file *filp);
  95
  96/* get buffer information to memory region allocated by gem. */
  97int exynos_drm_gem_get_ioctl(struct drm_device *dev, void *data,
  98                                      struct drm_file *file_priv);
  99
 100/* get buffer size to gem handle. */
 101unsigned long exynos_drm_gem_get_size(struct drm_device *dev,
 102                                                unsigned int gem_handle,
 103                                                struct drm_file *file_priv);
 104
 105/* free gem object. */
 106void exynos_drm_gem_free_object(struct drm_gem_object *obj);
 107
 108/* create memory region for drm framebuffer. */
 109int exynos_drm_gem_dumb_create(struct drm_file *file_priv,
 110                               struct drm_device *dev,
 111                               struct drm_mode_create_dumb *args);
 112
 113/* page fault handler and mmap fault address(virtual) to physical memory. */
 114int exynos_drm_gem_fault(struct vm_fault *vmf);
 115
 116/* set vm_flags and we can change the vm attribute to other one at here. */
 117int exynos_drm_gem_mmap(struct file *filp, struct vm_area_struct *vma);
 118
 119/* low-level interface prime helpers */
 120struct drm_gem_object *exynos_drm_gem_prime_import(struct drm_device *dev,
 121                                            struct dma_buf *dma_buf);
 122struct sg_table *exynos_drm_gem_prime_get_sg_table(struct drm_gem_object *obj);
 123struct drm_gem_object *
 124exynos_drm_gem_prime_import_sg_table(struct drm_device *dev,
 125                                     struct dma_buf_attachment *attach,
 126                                     struct sg_table *sgt);
 127void *exynos_drm_gem_prime_vmap(struct drm_gem_object *obj);
 128void exynos_drm_gem_prime_vunmap(struct drm_gem_object *obj, void *vaddr);
 129int exynos_drm_gem_prime_mmap(struct drm_gem_object *obj,
 130                              struct vm_area_struct *vma);
 131
 132#endif
 133