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 #define to_exynos_gem_obj(x) container_of(x,\ 16 struct exynos_drm_gem_obj, base) 17 18 #define IS_NONCONTIG_BUFFER(f) (f & EXYNOS_BO_NONCONTIG) 19 20 /* 21 * exynos drm gem buffer structure. 22 * 23 * @kvaddr: kernel virtual address to allocated memory region. 24 * *userptr: user space address. 25 * @dma_addr: bus address(accessed by dma) to allocated memory region. 26 * - this address could be physical address without IOMMU and 27 * device address with IOMMU. 28 * @write: whether pages will be written to by the caller. 29 * @pages: Array of backing pages. 30 * @sgt: sg table to transfer page data. 31 * @size: size of allocated memory region. 32 * @pfnmap: indicate whether memory region from userptr is mmaped with 33 * VM_PFNMAP or not. 34 */ 35 struct exynos_drm_gem_buf { 36 void __iomem *kvaddr; 37 unsigned long userptr; 38 dma_addr_t dma_addr; 39 struct dma_attrs dma_attrs; 40 unsigned int write; 41 struct page **pages; 42 struct sg_table *sgt; 43 unsigned long size; 44 bool pfnmap; 45 }; 46 47 /* 48 * exynos drm buffer structure. 49 * 50 * @base: a gem object. 51 * - a new handle to this gem object would be created 52 * by drm_gem_handle_create(). 53 * @buffer: a pointer to exynos_drm_gem_buffer object. 54 * - contain the information to memory region allocated 55 * by user request or at framebuffer creation. 56 * continuous memory region allocated by user request 57 * or at framebuffer creation. 58 * @size: size requested from user, in bytes and this size is aligned 59 * in page unit. 60 * @vma: a pointer to vm_area. 61 * @flags: indicate memory type to allocated buffer and cache attruibute. 62 * 63 * P.S. this object would be transfered to user as kms_bo.handle so 64 * user can access the buffer through kms_bo.handle. 65 */ 66 struct exynos_drm_gem_obj { 67 struct drm_gem_object base; 68 struct exynos_drm_gem_buf *buffer; 69 unsigned long size; 70 struct vm_area_struct *vma; 71 unsigned int flags; 72 }; 73 74 struct page **exynos_gem_get_pages(struct drm_gem_object *obj, gfp_t gfpmask); 75 76 /* destroy a buffer with gem object */ 77 void exynos_drm_gem_destroy(struct exynos_drm_gem_obj *exynos_gem_obj); 78 79 /* create a private gem object and initialize it. */ 80 struct exynos_drm_gem_obj *exynos_drm_gem_init(struct drm_device *dev, 81 unsigned long size); 82 83 /* create a new buffer with gem object */ 84 struct exynos_drm_gem_obj *exynos_drm_gem_create(struct drm_device *dev, 85 unsigned int flags, 86 unsigned long size); 87 88 /* 89 * request gem object creation and buffer allocation as the size 90 * that it is calculated with framebuffer information such as width, 91 * height and bpp. 92 */ 93 int exynos_drm_gem_create_ioctl(struct drm_device *dev, void *data, 94 struct drm_file *file_priv); 95 96 /* 97 * get dma address from gem handle and this function could be used for 98 * other drivers such as 2d/3d acceleration drivers. 99 * with this function call, gem object reference count would be increased. 100 */ 101 dma_addr_t *exynos_drm_gem_get_dma_addr(struct drm_device *dev, 102 unsigned int gem_handle, 103 struct drm_file *filp); 104 105 /* 106 * put dma address from gem handle and this function could be used for 107 * other drivers such as 2d/3d acceleration drivers. 108 * with this function call, gem object reference count would be decreased. 109 */ 110 void exynos_drm_gem_put_dma_addr(struct drm_device *dev, 111 unsigned int gem_handle, 112 struct drm_file *filp); 113 114 /* get buffer offset to map to user space. */ 115 int exynos_drm_gem_map_offset_ioctl(struct drm_device *dev, void *data, 116 struct drm_file *file_priv); 117 118 /* 119 * mmap the physically continuous memory that a gem object contains 120 * to user space. 121 */ 122 int exynos_drm_gem_mmap_ioctl(struct drm_device *dev, void *data, 123 struct drm_file *file_priv); 124 125 /* map user space allocated by malloc to pages. */ 126 int exynos_drm_gem_userptr_ioctl(struct drm_device *dev, void *data, 127 struct drm_file *file_priv); 128 129 /* get buffer information to memory region allocated by gem. */ 130 int exynos_drm_gem_get_ioctl(struct drm_device *dev, void *data, 131 struct drm_file *file_priv); 132 133 /* get buffer size to gem handle. */ 134 unsigned long exynos_drm_gem_get_size(struct drm_device *dev, 135 unsigned int gem_handle, 136 struct drm_file *file_priv); 137 138 /* free gem object. */ 139 void exynos_drm_gem_free_object(struct drm_gem_object *gem_obj); 140 141 /* create memory region for drm framebuffer. */ 142 int exynos_drm_gem_dumb_create(struct drm_file *file_priv, 143 struct drm_device *dev, 144 struct drm_mode_create_dumb *args); 145 146 /* map memory region for drm framebuffer to user space. */ 147 int exynos_drm_gem_dumb_map_offset(struct drm_file *file_priv, 148 struct drm_device *dev, uint32_t handle, 149 uint64_t *offset); 150 151 /* page fault handler and mmap fault address(virtual) to physical memory. */ 152 int exynos_drm_gem_fault(struct vm_area_struct *vma, struct vm_fault *vmf); 153 154 /* set vm_flags and we can change the vm attribute to other one at here. */ 155 int exynos_drm_gem_mmap(struct file *filp, struct vm_area_struct *vma); 156 157 static inline int vma_is_io(struct vm_area_struct *vma) 158 { 159 return !!(vma->vm_flags & (VM_IO | VM_PFNMAP)); 160 } 161 162 /* get a copy of a virtual memory region. */ 163 struct vm_area_struct *exynos_gem_get_vma(struct vm_area_struct *vma); 164 165 /* release a userspace virtual memory area. */ 166 void exynos_gem_put_vma(struct vm_area_struct *vma); 167 168 /* get pages from user space. */ 169 int exynos_gem_get_pages_from_userptr(unsigned long start, 170 unsigned int npages, 171 struct page **pages, 172 struct vm_area_struct *vma); 173 174 /* drop the reference to pages. */ 175 void exynos_gem_put_pages_to_userptr(struct page **pages, 176 unsigned int npages, 177 struct vm_area_struct *vma); 178 179 /* map sgt with dma region. */ 180 int exynos_gem_map_sgt_with_dma(struct drm_device *drm_dev, 181 struct sg_table *sgt, 182 enum dma_data_direction dir); 183 184 /* unmap sgt from dma region. */ 185 void exynos_gem_unmap_sgt_from_dma(struct drm_device *drm_dev, 186 struct sg_table *sgt, 187 enum dma_data_direction dir); 188 189 #endif 190