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Linux kernel mirror (for testing)
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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#include <linux/mm_types.h>
17
18#define to_exynos_gem(x) container_of(x, struct exynos_drm_gem, 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 * @sgt: Imported sg_table.
43 *
44 * P.S. this object would be transferred to user as kms_bo.handle so
45 * user can access the buffer through kms_bo.handle.
46 */
47struct exynos_drm_gem {
48 struct drm_gem_object base;
49 unsigned int flags;
50 unsigned long size;
51 void *cookie;
52 void __iomem *kvaddr;
53 dma_addr_t dma_addr;
54 unsigned long dma_attrs;
55 struct page **pages;
56 struct sg_table *sgt;
57};
58
59/* destroy a buffer with gem object */
60void exynos_drm_gem_destroy(struct exynos_drm_gem *exynos_gem);
61
62/* create a new buffer with gem object */
63struct exynos_drm_gem *exynos_drm_gem_create(struct drm_device *dev,
64 unsigned int flags,
65 unsigned long size);
66
67/*
68 * request gem object creation and buffer allocation as the size
69 * that it is calculated with framebuffer information such as width,
70 * height and bpp.
71 */
72int exynos_drm_gem_create_ioctl(struct drm_device *dev, void *data,
73 struct drm_file *file_priv);
74
75/* get fake-offset of gem object that can be used with mmap. */
76int exynos_drm_gem_map_ioctl(struct drm_device *dev, void *data,
77 struct drm_file *file_priv);
78
79/*
80 * get exynos drm object from gem handle, 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 */
84struct exynos_drm_gem *exynos_drm_gem_get(struct drm_file *filp,
85 unsigned int gem_handle);
86
87/*
88 * put exynos drm object acquired from exynos_drm_gem_get(),
89 * gem object reference count would be decreased.
90 */
91static inline void exynos_drm_gem_put(struct exynos_drm_gem *exynos_gem)
92{
93 drm_gem_object_put_unlocked(&exynos_gem->base);
94}
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/* free gem object. */
101void exynos_drm_gem_free_object(struct drm_gem_object *obj);
102
103/* create memory region for drm framebuffer. */
104int exynos_drm_gem_dumb_create(struct drm_file *file_priv,
105 struct drm_device *dev,
106 struct drm_mode_create_dumb *args);
107
108/* page fault handler and mmap fault address(virtual) to physical memory. */
109vm_fault_t exynos_drm_gem_fault(struct vm_fault *vmf);
110
111/* set vm_flags and we can change the vm attribute to other one at here. */
112int exynos_drm_gem_mmap(struct file *filp, struct vm_area_struct *vma);
113
114/* low-level interface prime helpers */
115struct drm_gem_object *exynos_drm_gem_prime_import(struct drm_device *dev,
116 struct dma_buf *dma_buf);
117struct sg_table *exynos_drm_gem_prime_get_sg_table(struct drm_gem_object *obj);
118struct drm_gem_object *
119exynos_drm_gem_prime_import_sg_table(struct drm_device *dev,
120 struct dma_buf_attachment *attach,
121 struct sg_table *sgt);
122void *exynos_drm_gem_prime_vmap(struct drm_gem_object *obj);
123void exynos_drm_gem_prime_vunmap(struct drm_gem_object *obj, void *vaddr);
124int exynos_drm_gem_prime_mmap(struct drm_gem_object *obj,
125 struct vm_area_struct *vma);
126
127#endif