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 * @cookie: cookie returned by dma_alloc_attrs 26 * @kvaddr: kernel virtual address to allocated memory region. 27 * *userptr: user space address. 28 * @dma_addr: bus address(accessed by dma) to allocated memory region. 29 * - this address could be physical address without IOMMU and 30 * device address with IOMMU. 31 * @write: whether pages will be written to by the caller. 32 * @pages: Array of backing pages. 33 * @sgt: sg table to transfer page data. 34 * @size: size of allocated memory region. 35 * @pfnmap: indicate whether memory region from userptr is mmaped with 36 * VM_PFNMAP or not. 37 */ 38 struct exynos_drm_gem_buf { 39 void *cookie; 40 void __iomem *kvaddr; 41 unsigned long userptr; 42 dma_addr_t dma_addr; 43 struct dma_attrs dma_attrs; 44 unsigned int write; 45 struct page **pages; 46 struct sg_table *sgt; 47 unsigned long size; 48 bool pfnmap; 49 }; 50 51 /* 52 * exynos drm buffer structure. 53 * 54 * @base: a gem object. 55 * - a new handle to this gem object would be created 56 * by drm_gem_handle_create(). 57 * @buffer: a pointer to exynos_drm_gem_buffer object. 58 * - contain the information to memory region allocated 59 * by user request or at framebuffer creation. 60 * continuous memory region allocated by user request 61 * or at framebuffer creation. 62 * @size: size requested from user, in bytes and this size is aligned 63 * in page unit. 64 * @vma: a pointer to vm_area. 65 * @flags: indicate memory type to allocated buffer and cache attruibute. 66 * 67 * P.S. this object would be transferred to user as kms_bo.handle so 68 * user can access the buffer through kms_bo.handle. 69 */ 70 struct exynos_drm_gem_obj { 71 struct drm_gem_object base; 72 struct exynos_drm_gem_buf *buffer; 73 unsigned long size; 74 struct vm_area_struct *vma; 75 unsigned int flags; 76 }; 77 78 struct page **exynos_gem_get_pages(struct drm_gem_object *obj, gfp_t gfpmask); 79 80 /* destroy a buffer with gem object */ 81 void exynos_drm_gem_destroy(struct exynos_drm_gem_obj *exynos_gem_obj); 82 83 /* create a private gem object and initialize it. */ 84 struct exynos_drm_gem_obj *exynos_drm_gem_init(struct drm_device *dev, 85 unsigned long size); 86 87 /* create a new buffer with gem object */ 88 struct exynos_drm_gem_obj *exynos_drm_gem_create(struct drm_device *dev, 89 unsigned int flags, 90 unsigned long size); 91 92 /* 93 * request gem object creation and buffer allocation as the size 94 * that it is calculated with framebuffer information such as width, 95 * height and bpp. 96 */ 97 int exynos_drm_gem_create_ioctl(struct drm_device *dev, void *data, 98 struct drm_file *file_priv); 99 100 /* 101 * get dma address from gem handle and this function could be used for 102 * other drivers such as 2d/3d acceleration drivers. 103 * with this function call, gem object reference count would be increased. 104 */ 105 dma_addr_t *exynos_drm_gem_get_dma_addr(struct drm_device *dev, 106 unsigned int gem_handle, 107 struct drm_file *filp); 108 109 /* 110 * put dma address from gem handle and this function could be used for 111 * other drivers such as 2d/3d acceleration drivers. 112 * with this function call, gem object reference count would be decreased. 113 */ 114 void exynos_drm_gem_put_dma_addr(struct drm_device *dev, 115 unsigned int gem_handle, 116 struct drm_file *filp); 117 118 /* map user space allocated by malloc to pages. */ 119 int exynos_drm_gem_userptr_ioctl(struct drm_device *dev, void *data, 120 struct drm_file *file_priv); 121 122 /* get buffer information to memory region allocated by gem. */ 123 int exynos_drm_gem_get_ioctl(struct drm_device *dev, void *data, 124 struct drm_file *file_priv); 125 126 /* get buffer size to gem handle. */ 127 unsigned long exynos_drm_gem_get_size(struct drm_device *dev, 128 unsigned int gem_handle, 129 struct drm_file *file_priv); 130 131 /* free gem object. */ 132 void exynos_drm_gem_free_object(struct drm_gem_object *gem_obj); 133 134 /* create memory region for drm framebuffer. */ 135 int exynos_drm_gem_dumb_create(struct drm_file *file_priv, 136 struct drm_device *dev, 137 struct drm_mode_create_dumb *args); 138 139 /* map memory region for drm framebuffer to user space. */ 140 int exynos_drm_gem_dumb_map_offset(struct drm_file *file_priv, 141 struct drm_device *dev, uint32_t handle, 142 uint64_t *offset); 143 144 /* page fault handler and mmap fault address(virtual) to physical memory. */ 145 int exynos_drm_gem_fault(struct vm_area_struct *vma, struct vm_fault *vmf); 146 147 /* set vm_flags and we can change the vm attribute to other one at here. */ 148 int exynos_drm_gem_mmap(struct file *filp, struct vm_area_struct *vma); 149 150 static inline int vma_is_io(struct vm_area_struct *vma) 151 { 152 return !!(vma->vm_flags & (VM_IO | VM_PFNMAP)); 153 } 154 155 /* get a copy of a virtual memory region. */ 156 struct vm_area_struct *exynos_gem_get_vma(struct vm_area_struct *vma); 157 158 /* release a userspace virtual memory area. */ 159 void exynos_gem_put_vma(struct vm_area_struct *vma); 160 161 /* get pages from user space. */ 162 int exynos_gem_get_pages_from_userptr(unsigned long start, 163 unsigned int npages, 164 struct page **pages, 165 struct vm_area_struct *vma); 166 167 /* drop the reference to pages. */ 168 void exynos_gem_put_pages_to_userptr(struct page **pages, 169 unsigned int npages, 170 struct vm_area_struct *vma); 171 172 /* map sgt with dma region. */ 173 int exynos_gem_map_sgt_with_dma(struct drm_device *drm_dev, 174 struct sg_table *sgt, 175 enum dma_data_direction dir); 176 177 /* unmap sgt from dma region. */ 178 void exynos_gem_unmap_sgt_from_dma(struct drm_device *drm_dev, 179 struct sg_table *sgt, 180 enum dma_data_direction dir); 181 182 #endif 183