drivers/gpu/drm/exynos/exynos_drm_gem.h

   1 /* SPDX-License-Identifier: GPL-2.0-or-later */
   2 /* exynos_drm_gem.h
   3  *
   4  * Copyright (c) 2011 Samsung Electronics Co., Ltd.
   5  * Authoer: Inki Dae <inki.dae@samsung.com>
   6  */
   7
   8 #ifndef _EXYNOS_DRM_GEM_H_
   9 #define _EXYNOS_DRM_GEM_H_
  10
  11 #include <drm/drm_gem.h>
  12 #include <linux/mm_types.h>
  13
  14 #define to_exynos_gem(x)        container_of(x, struct exynos_drm_gem, base)
  15
  16 #define IS_NONCONTIG_BUFFER(f)          (f & EXYNOS_BO_NONCONTIG)
  17
  18 /*
  19  * exynos drm buffer structure.
  20  *
  21  * @base: a gem object.
  22  *      - a new handle to this gem object would be created
  23  *      by drm_gem_handle_create().
  24  * @flags: indicate memory type to allocated buffer and cache attruibute.
  25  * @size: size requested from user, in bytes and this size is aligned
  26  *      in page unit.
  27  * @cookie: cookie returned by dma_alloc_attrs
  28  * @kvaddr: kernel virtual address to allocated memory region (for fbdev)
  29  * @dma_addr: bus address(accessed by dma) to allocated memory region.
  30  *      - this address could be physical address without IOMMU and
  31  *      device address with IOMMU.
  32  * @dma_attrs: attrs passed dma mapping framework
  33  * @sgt: Imported sg_table.
  34  *
  35  * P.S. this object would be transferred to user as kms_bo.handle so
  36  *      user can access the buffer through kms_bo.handle.
  37  */
  38 struct exynos_drm_gem {
  39         struct drm_gem_object   base;
  40         unsigned int            flags;
  41         unsigned long           size;
  42         void                    *cookie;
  43         void                    *kvaddr;
  44         dma_addr_t              dma_addr;
  45         unsigned long           dma_attrs;
  46         struct sg_table         *sgt;
  47 };
  48
  49 /* destroy a buffer with gem object */
  50 void exynos_drm_gem_destroy(struct exynos_drm_gem *exynos_gem);
  51
  52 /* create a new buffer with gem object */
  53 struct exynos_drm_gem *exynos_drm_gem_create(struct drm_device *dev,
  54                                              unsigned int flags,
  55                                              unsigned long size,
  56                                              bool kvmap);
  57
  58 /*
  59  * request gem object creation and buffer allocation as the size
  60  * that it is calculated with framebuffer information such as width,
  61  * height and bpp.
  62  */
  63 int exynos_drm_gem_create_ioctl(struct drm_device *dev, void *data,
  64                                 struct drm_file *file_priv);
  65
  66 /* get fake-offset of gem object that can be used with mmap. */
  67 int exynos_drm_gem_map_ioctl(struct drm_device *dev, void *data,
  68                              struct drm_file *file_priv);
  69
  70 /*
  71  * get exynos drm object from gem handle, this function could be used for
  72  * other drivers such as 2d/3d acceleration drivers.
  73  * with this function call, gem object reference count would be increased.
  74  */
  75 struct exynos_drm_gem *exynos_drm_gem_get(struct drm_file *filp,
  76                                           unsigned int gem_handle);
  77
  78 /*
  79  * put exynos drm object acquired from exynos_drm_gem_get(),
  80  * gem object reference count would be decreased.
  81  */
  82 static inline void exynos_drm_gem_put(struct exynos_drm_gem *exynos_gem)
  83 {
  84         drm_gem_object_put(&exynos_gem->base);
  85 }
  86
  87 /* get buffer information to memory region allocated by gem. */
  88 int exynos_drm_gem_get_ioctl(struct drm_device *dev, void *data,
  89                                       struct drm_file *file_priv);
  90
  91 /* free gem object. */
  92 void exynos_drm_gem_free_object(struct drm_gem_object *obj);
  93
  94 /* create memory region for drm framebuffer. */
  95 int exynos_drm_gem_dumb_create(struct drm_file *file_priv,
  96                                struct drm_device *dev,
  97                                struct drm_mode_create_dumb *args);
  98
  99 /* set vm_flags and we can change the vm attribute to other one at here. */
 100 int exynos_drm_gem_mmap(struct file *filp, struct vm_area_struct *vma);
 101
 102 /* low-level interface prime helpers */
 103 struct drm_gem_object *exynos_drm_gem_prime_import(struct drm_device *dev,
 104                                             struct dma_buf *dma_buf);
 105 struct sg_table *exynos_drm_gem_prime_get_sg_table(struct drm_gem_object *obj);
 106 struct drm_gem_object *
 107 exynos_drm_gem_prime_import_sg_table(struct drm_device *dev,
 108                                      struct dma_buf_attachment *attach,
 109                                      struct sg_table *sgt);
 110 int exynos_drm_gem_prime_mmap(struct drm_gem_object *obj,
 111                               struct vm_area_struct *vma);
 112
 113 #endif