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 gem buffer structure.
  24  *
  25  * @kvaddr: kernel virtual address to allocated memory region.
  26  * *userptr: user space address.
  27  * @dma_addr: bus address(accessed by dma) to allocated memory region.
  28  *      - this address could be physical address without IOMMU and
  29  *      device address with IOMMU.
  30  * @write: whether pages will be written to by the caller.
  31  * @pages: Array of backing pages.
  32  * @sgt: sg table to transfer page data.
  33  * @size: size of allocated memory region.
  34  * @pfnmap: indicate whether memory region from userptr is mmaped with
  35  *      VM_PFNMAP or not.
  36  */
  37 struct exynos_drm_gem_buf {
  38         void __iomem            *kvaddr;
  39         unsigned long           userptr;
  40         dma_addr_t              dma_addr;
  41         struct dma_attrs        dma_attrs;
  42         unsigned int            write;
  43         struct page             **pages;
  44         struct sg_table         *sgt;
  45         unsigned long           size;
  46         bool                    pfnmap;
  47 };
  48
  49 /*
  50  * exynos drm buffer structure.
  51  *
  52  * @base: a gem object.
  53  *      - a new handle to this gem object would be created
  54  *      by drm_gem_handle_create().
  55  * @buffer: a pointer to exynos_drm_gem_buffer object.
  56  *      - contain the information to memory region allocated
  57  *      by user request or at framebuffer creation.
  58  *      continuous memory region allocated by user request
  59  *      or at framebuffer creation.
  60  * @size: size requested from user, in bytes and this size is aligned
  61  *      in page unit.
  62  * @vma: a pointer to vm_area.
  63  * @flags: indicate memory type to allocated buffer and cache attruibute.
  64  *
  65  * P.S. this object would be transferred to user as kms_bo.handle so
  66  *      user can access the buffer through kms_bo.handle.
  67  */
  68 struct exynos_drm_gem_obj {
  69         struct drm_gem_object           base;
  70         struct exynos_drm_gem_buf       *buffer;
  71         unsigned long                   size;
  72         struct vm_area_struct           *vma;
  73         unsigned int                    flags;
  74 };
  75
  76 struct page **exynos_gem_get_pages(struct drm_gem_object *obj, gfp_t gfpmask);
  77
  78 /* destroy a buffer with gem object */
  79 void exynos_drm_gem_destroy(struct exynos_drm_gem_obj *exynos_gem_obj);
  80
  81 /* create a private gem object and initialize it. */
  82 struct exynos_drm_gem_obj *exynos_drm_gem_init(struct drm_device *dev,
  83                                                       unsigned long size);
  84
  85 /* create a new buffer with gem object */
  86 struct exynos_drm_gem_obj *exynos_drm_gem_create(struct drm_device *dev,
  87                                                 unsigned int flags,
  88                                                 unsigned long size);
  89
  90 /*
  91  * request gem object creation and buffer allocation as the size
  92  * that it is calculated with framebuffer information such as width,
  93  * height and bpp.
  94  */
  95 int exynos_drm_gem_create_ioctl(struct drm_device *dev, void *data,
  96                                 struct drm_file *file_priv);
  97
  98 /*
  99  * get dma address from gem handle and this function could be used for
 100  * other drivers such as 2d/3d acceleration drivers.
 101  * with this function call, gem object reference count would be increased.
 102  */
 103 dma_addr_t *exynos_drm_gem_get_dma_addr(struct drm_device *dev,
 104                                         unsigned int gem_handle,
 105                                         struct drm_file *filp);
 106
 107 /*
 108  * put dma address from gem handle and this function could be used for
 109  * other drivers such as 2d/3d acceleration drivers.
 110  * with this function call, gem object reference count would be decreased.
 111  */
 112 void exynos_drm_gem_put_dma_addr(struct drm_device *dev,
 113                                         unsigned int gem_handle,
 114                                         struct drm_file *filp);
 115
 116 /* map user space allocated by malloc to pages. */
 117 int exynos_drm_gem_userptr_ioctl(struct drm_device *dev, void *data,
 118                                       struct drm_file *file_priv);
 119
 120 /* get buffer information to memory region allocated by gem. */
 121 int exynos_drm_gem_get_ioctl(struct drm_device *dev, void *data,
 122                                       struct drm_file *file_priv);
 123
 124 /* get buffer size to gem handle. */
 125 unsigned long exynos_drm_gem_get_size(struct drm_device *dev,
 126                                                 unsigned int gem_handle,
 127                                                 struct drm_file *file_priv);
 128
 129 /* free gem object. */
 130 void exynos_drm_gem_free_object(struct drm_gem_object *gem_obj);
 131
 132 /* create memory region for drm framebuffer. */
 133 int exynos_drm_gem_dumb_create(struct drm_file *file_priv,
 134                                struct drm_device *dev,
 135                                struct drm_mode_create_dumb *args);
 136
 137 /* map memory region for drm framebuffer to user space. */
 138 int exynos_drm_gem_dumb_map_offset(struct drm_file *file_priv,
 139                                    struct drm_device *dev, uint32_t handle,
 140                                    uint64_t *offset);
 141
 142 /* page fault handler and mmap fault address(virtual) to physical memory. */
 143 int exynos_drm_gem_fault(struct vm_area_struct *vma, struct vm_fault *vmf);
 144
 145 /* set vm_flags and we can change the vm attribute to other one at here. */
 146 int exynos_drm_gem_mmap(struct file *filp, struct vm_area_struct *vma);
 147
 148 static inline int vma_is_io(struct vm_area_struct *vma)
 149 {
 150         return !!(vma->vm_flags & (VM_IO | VM_PFNMAP));
 151 }
 152
 153 /* get a copy of a virtual memory region. */
 154 struct vm_area_struct *exynos_gem_get_vma(struct vm_area_struct *vma);
 155
 156 /* release a userspace virtual memory area. */
 157 void exynos_gem_put_vma(struct vm_area_struct *vma);
 158
 159 /* get pages from user space. */
 160 int exynos_gem_get_pages_from_userptr(unsigned long start,
 161                                                 unsigned int npages,
 162                                                 struct page **pages,
 163                                                 struct vm_area_struct *vma);
 164
 165 /* drop the reference to pages. */
 166 void exynos_gem_put_pages_to_userptr(struct page **pages,
 167                                         unsigned int npages,
 168                                         struct vm_area_struct *vma);
 169
 170 /* map sgt with dma region. */
 171 int exynos_gem_map_sgt_with_dma(struct drm_device *drm_dev,
 172                                 struct sg_table *sgt,
 173                                 enum dma_data_direction dir);
 174
 175 /* unmap sgt from dma region. */
 176 void exynos_gem_unmap_sgt_from_dma(struct drm_device *drm_dev,
 177                                 struct sg_table *sgt,
 178                                 enum dma_data_direction dir);
 179
 180 #endif