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  * 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_obj(x)    container_of(x,\
  18                         struct exynos_drm_gem_obj, base)
  19
  20 #define IS_NONCONTIG_BUFFER(f)          (f & EXYNOS_BO_NONCONTIG)
  21
  22 /*
  23  * exynos drm buffer structure.
  24  *
  25  * @base: a gem object.
  26  *      - a new handle to this gem object would be created
  27  *      by drm_gem_handle_create().
  28  * @buffer: a pointer to exynos_drm_gem_buffer object.
  29  *      - contain the information to memory region allocated
  30  *      by user request or at framebuffer creation.
  31  *      continuous memory region allocated by user request
  32  *      or at framebuffer creation.
  33  * @flags: indicate memory type to allocated buffer and cache attruibute.
  34  * @size: size requested from user, in bytes and this size is aligned
  35  *      in page unit.
  36  * @cookie: cookie returned by dma_alloc_attrs
  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  * @pages: Array of backing pages.
  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  */
  46 struct exynos_drm_gem_obj {
  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         struct dma_attrs        dma_attrs;
  54         struct page             **pages;
  55 };
  56
  57 struct page **exynos_gem_get_pages(struct drm_gem_object *obj, gfp_t gfpmask);
  58
  59 /* destroy a buffer with gem object */
  60 void exynos_drm_gem_destroy(struct exynos_drm_gem_obj *exynos_gem_obj);
  61
  62 /* create a private gem object and initialize it. */
  63 struct exynos_drm_gem_obj *exynos_drm_gem_init(struct drm_device *dev,
  64                                                       unsigned long size);
  65
  66 /* create a new buffer with gem object */
  67 struct exynos_drm_gem_obj *exynos_drm_gem_create(struct drm_device *dev,
  68                                                 unsigned int flags,
  69                                                 unsigned long size);
  70
  71 /*
  72  * request gem object creation and buffer allocation as the size
  73  * that it is calculated with framebuffer information such as width,
  74  * height and bpp.
  75  */
  76 int exynos_drm_gem_create_ioctl(struct drm_device *dev, void *data,
  77                                 struct drm_file *file_priv);
  78
  79 /*
  80  * get dma address from gem handle and this function could be used for
  81  * other drivers such as 2d/3d acceleration drivers.
  82  * with this function call, gem object reference count would be increased.
  83  */
  84 dma_addr_t *exynos_drm_gem_get_dma_addr(struct drm_device *dev,
  85                                         unsigned int gem_handle,
  86                                         struct drm_file *filp);
  87
  88 /*
  89  * put dma address from gem handle and this function could be used for
  90  * other drivers such as 2d/3d acceleration drivers.
  91  * with this function call, gem object reference count would be decreased.
  92  */
  93 void exynos_drm_gem_put_dma_addr(struct drm_device *dev,
  94                                         unsigned int gem_handle,
  95                                         struct drm_file *filp);
  96
  97 /* map user space allocated by malloc to pages. */
  98 int exynos_drm_gem_userptr_ioctl(struct drm_device *dev, void *data,
  99                                       struct drm_file *file_priv);
 100
 101 /* get buffer information to memory region allocated by gem. */
 102 int exynos_drm_gem_get_ioctl(struct drm_device *dev, void *data,
 103                                       struct drm_file *file_priv);
 104
 105 /* get buffer size to gem handle. */
 106 unsigned long exynos_drm_gem_get_size(struct drm_device *dev,
 107                                                 unsigned int gem_handle,
 108                                                 struct drm_file *file_priv);
 109
 110 /* free gem object. */
 111 void exynos_drm_gem_free_object(struct drm_gem_object *gem_obj);
 112
 113 /* create memory region for drm framebuffer. */
 114 int exynos_drm_gem_dumb_create(struct drm_file *file_priv,
 115                                struct drm_device *dev,
 116                                struct drm_mode_create_dumb *args);
 117
 118 /* map memory region for drm framebuffer to user space. */
 119 int exynos_drm_gem_dumb_map_offset(struct drm_file *file_priv,
 120                                    struct drm_device *dev, uint32_t handle,
 121                                    uint64_t *offset);
 122
 123 /* page fault handler and mmap fault address(virtual) to physical memory. */
 124 int exynos_drm_gem_fault(struct vm_area_struct *vma, struct vm_fault *vmf);
 125
 126 /* set vm_flags and we can change the vm attribute to other one at here. */
 127 int exynos_drm_gem_mmap(struct file *filp, struct vm_area_struct *vma);
 128
 129 static inline int vma_is_io(struct vm_area_struct *vma)
 130 {
 131         return !!(vma->vm_flags & (VM_IO | VM_PFNMAP));
 132 }
 133
 134 /* get a copy of a virtual memory region. */
 135 struct vm_area_struct *exynos_gem_get_vma(struct vm_area_struct *vma);
 136
 137 /* release a userspace virtual memory area. */
 138 void exynos_gem_put_vma(struct vm_area_struct *vma);
 139
 140 /* get pages from user space. */
 141 int exynos_gem_get_pages_from_userptr(unsigned long start,
 142                                                 unsigned int npages,
 143                                                 struct page **pages,
 144                                                 struct vm_area_struct *vma);
 145
 146 /* drop the reference to pages. */
 147 void exynos_gem_put_pages_to_userptr(struct page **pages,
 148                                         unsigned int npages,
 149                                         struct vm_area_struct *vma);
 150
 151 /* map sgt with dma region. */
 152 int exynos_gem_map_sgt_with_dma(struct drm_device *drm_dev,
 153                                 struct sg_table *sgt,
 154                                 enum dma_data_direction dir);
 155
 156 /* unmap sgt from dma region. */
 157 void exynos_gem_unmap_sgt_from_dma(struct drm_device *drm_dev,
 158                                 struct sg_table *sgt,
 159                                 enum dma_data_direction dir);
 160
 161 /* low-level interface prime helpers */
 162 struct sg_table *exynos_drm_gem_prime_get_sg_table(struct drm_gem_object *obj);
 163 struct drm_gem_object *
 164 exynos_drm_gem_prime_import_sg_table(struct drm_device *dev,
 165                                      struct dma_buf_attachment *attach,
 166                                      struct sg_table *sgt);
 167 void *exynos_drm_gem_prime_vmap(struct drm_gem_object *obj);
 168 void exynos_drm_gem_prime_vunmap(struct drm_gem_object *obj, void *vaddr);
 169
 170 #endif