drivers/gpu/drm/exynos/exynos_drm_gem.h

   1 /* exynos_drm_gem.h
   2  *
   3  * Copyright (c) 2011 Samsung Electronics Co., Ltd.
   4  * Authoer: Inki Dae <inki.dae@samsung.com>
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a
   7  * copy of this software and associated documentation files (the "Software"),
   8  * to deal in the Software without restriction, including without limitation
   9  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  10  * and/or sell copies of the Software, and to permit persons to whom the
  11  * Software is furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice (including the next
  14  * paragraph) shall be included in all copies or substantial portions of the
  15  * Software.
  16  *
  17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  18  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  20  * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
  21  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  22  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  23  * OTHER DEALINGS IN THE SOFTWARE.
  24  */
  25
  26 #ifndef _EXYNOS_DRM_GEM_H_
  27 #define _EXYNOS_DRM_GEM_H_
  28
  29 #define to_exynos_gem_obj(x)    container_of(x,\
  30                         struct exynos_drm_gem_obj, base)
  31
  32 #define IS_NONCONTIG_BUFFER(f)          (f & EXYNOS_BO_NONCONTIG)
  33
  34 /*
  35  * exynos drm gem buffer structure.
  36  *
  37  * @kvaddr: kernel virtual address to allocated memory region.
  38  * @dma_addr: bus address(accessed by dma) to allocated memory region.
  39  *      - this address could be physical address without IOMMU and
  40  *      device address with IOMMU.
  41  * @sgt: sg table to transfer page data.
  42  * @pages: contain all pages to allocated memory region.
  43  * @page_size: could be 4K, 64K or 1MB.
  44  * @size: size of allocated memory region.
  45  */
  46 struct exynos_drm_gem_buf {
  47         void __iomem            *kvaddr;
  48         dma_addr_t              dma_addr;
  49         struct sg_table         *sgt;
  50         struct page             **pages;
  51         unsigned long           page_size;
  52         unsigned long           size;
  53 };
  54
  55 /*
  56  * exynos drm buffer structure.
  57  *
  58  * @base: a gem object.
  59  *      - a new handle to this gem object would be created
  60  *      by drm_gem_handle_create().
  61  * @buffer: a pointer to exynos_drm_gem_buffer object.
  62  *      - contain the information to memory region allocated
  63  *      by user request or at framebuffer creation.
  64  *      continuous memory region allocated by user request
  65  *      or at framebuffer creation.
  66  * @size: total memory size to physically non-continuous memory region.
  67  * @flags: indicate memory type to allocated buffer and cache attruibute.
  68  *
  69  * P.S. this object would be transfered to user as kms_bo.handle so
  70  *      user can access the buffer through kms_bo.handle.
  71  */
  72 struct exynos_drm_gem_obj {
  73         struct drm_gem_object           base;
  74         struct exynos_drm_gem_buf       *buffer;
  75         unsigned long                   size;
  76         unsigned int                    flags;
  77 };
  78
  79 struct page **exynos_gem_get_pages(struct drm_gem_object *obj, gfp_t gfpmask);
  80
  81 /* destroy a buffer with gem object */
  82 void exynos_drm_gem_destroy(struct exynos_drm_gem_obj *exynos_gem_obj);
  83
  84 /* create a private gem object and initialize it. */
  85 struct exynos_drm_gem_obj *exynos_drm_gem_init(struct drm_device *dev,
  86                                                       unsigned long size);
  87
  88 /* create a new buffer with gem object */
  89 struct exynos_drm_gem_obj *exynos_drm_gem_create(struct drm_device *dev,
  90                                                 unsigned int flags,
  91                                                 unsigned long size);
  92
  93 /*
  94  * request gem object creation and buffer allocation as the size
  95  * that it is calculated with framebuffer information such as width,
  96  * height and bpp.
  97  */
  98 int exynos_drm_gem_create_ioctl(struct drm_device *dev, void *data,
  99                                 struct drm_file *file_priv);
 100
 101 /*
 102  * get dma address from gem handle and this function could be used for
 103  * other drivers such as 2d/3d acceleration drivers.
 104  * with this function call, gem object reference count would be increased.
 105  */
 106 void *exynos_drm_gem_get_dma_addr(struct drm_device *dev,
 107                                         unsigned int gem_handle,
 108                                         struct drm_file *file_priv);
 109
 110 /*
 111  * put dma address from gem handle and this function could be used for
 112  * other drivers such as 2d/3d acceleration drivers.
 113  * with this function call, gem object reference count would be decreased.
 114  */
 115 void exynos_drm_gem_put_dma_addr(struct drm_device *dev,
 116                                         unsigned int gem_handle,
 117                                         struct drm_file *file_priv);
 118
 119 /* get buffer offset to map to user space. */
 120 int exynos_drm_gem_map_offset_ioctl(struct drm_device *dev, void *data,
 121                                     struct drm_file *file_priv);
 122
 123 /*
 124  * mmap the physically continuous memory that a gem object contains
 125  * to user space.
 126  */
 127 int exynos_drm_gem_mmap_ioctl(struct drm_device *dev, void *data,
 128                               struct drm_file *file_priv);
 129
 130 /* get buffer information to memory region allocated by gem. */
 131 int exynos_drm_gem_get_ioctl(struct drm_device *dev, void *data,
 132                                       struct drm_file *file_priv);
 133
 134 /* initialize gem object. */
 135 int exynos_drm_gem_init_object(struct drm_gem_object *obj);
 136
 137 /* free gem object. */
 138 void exynos_drm_gem_free_object(struct drm_gem_object *gem_obj);
 139
 140 /* create memory region for drm framebuffer. */
 141 int exynos_drm_gem_dumb_create(struct drm_file *file_priv,
 142                                struct drm_device *dev,
 143                                struct drm_mode_create_dumb *args);
 144
 145 /* map memory region for drm framebuffer to user space. */
 146 int exynos_drm_gem_dumb_map_offset(struct drm_file *file_priv,
 147                                    struct drm_device *dev, uint32_t handle,
 148                                    uint64_t *offset);
 149
 150 /*
 151  * destroy memory region allocated.
 152  *      - a gem handle and physical memory region pointed by a gem object
 153  *      would be released by drm_gem_handle_delete().
 154  */
 155 int exynos_drm_gem_dumb_destroy(struct drm_file *file_priv,
 156                                 struct drm_device *dev,
 157                                 unsigned int handle);
 158
 159 /* page fault handler and mmap fault address(virtual) to physical memory. */
 160 int exynos_drm_gem_fault(struct vm_area_struct *vma, struct vm_fault *vmf);
 161
 162 /* set vm_flags and we can change the vm attribute to other one at here. */
 163 int exynos_drm_gem_mmap(struct file *filp, struct vm_area_struct *vma);
 164
 165 #endif