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 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 * 43 * P.S. this object would be transferred to user as kms_bo.handle so 44 * user can access the buffer through kms_bo.handle. 45 */ 46 struct exynos_drm_gem_obj { 47 struct drm_gem_object base; 48 unsigned int flags; 49 unsigned long size; 50 void *cookie; 51 void __iomem *kvaddr; 52 dma_addr_t dma_addr; 53 struct dma_attrs dma_attrs; 54 struct page **pages; 55 }; 56 57 struct page **exynos_gem_get_pages(struct drm_gem_object *obj, gfp_t gfpmask); 58 59 /* destroy a buffer with gem object */ 60 void exynos_drm_gem_destroy(struct exynos_drm_gem_obj *exynos_gem_obj); 61 62 /* create a private gem object and initialize it. */ 63 struct exynos_drm_gem_obj *exynos_drm_gem_init(struct drm_device *dev, 64 unsigned long size); 65 66 /* create a new buffer with gem object */ 67 struct exynos_drm_gem_obj *exynos_drm_gem_create(struct drm_device *dev, 68 unsigned int flags, 69 unsigned long size); 70 71 /* 72 * request gem object creation and buffer allocation as the size 73 * that it is calculated with framebuffer information such as width, 74 * height and bpp. 75 */ 76 int exynos_drm_gem_create_ioctl(struct drm_device *dev, void *data, 77 struct drm_file *file_priv); 78 79 /* 80 * get dma address from gem handle and 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 */ 84 dma_addr_t *exynos_drm_gem_get_dma_addr(struct drm_device *dev, 85 unsigned int gem_handle, 86 struct drm_file *filp); 87 88 /* 89 * put dma address from gem handle and this function could be used for 90 * other drivers such as 2d/3d acceleration drivers. 91 * with this function call, gem object reference count would be decreased. 92 */ 93 void exynos_drm_gem_put_dma_addr(struct drm_device *dev, 94 unsigned int gem_handle, 95 struct drm_file *filp); 96 97 /* map user space allocated by malloc to pages. */ 98 int exynos_drm_gem_userptr_ioctl(struct drm_device *dev, void *data, 99 struct drm_file *file_priv); 100 101 /* get buffer information to memory region allocated by gem. */ 102 int exynos_drm_gem_get_ioctl(struct drm_device *dev, void *data, 103 struct drm_file *file_priv); 104 105 /* get buffer size to gem handle. */ 106 unsigned long exynos_drm_gem_get_size(struct drm_device *dev, 107 unsigned int gem_handle, 108 struct drm_file *file_priv); 109 110 /* free gem object. */ 111 void exynos_drm_gem_free_object(struct drm_gem_object *gem_obj); 112 113 /* create memory region for drm framebuffer. */ 114 int exynos_drm_gem_dumb_create(struct drm_file *file_priv, 115 struct drm_device *dev, 116 struct drm_mode_create_dumb *args); 117 118 /* map memory region for drm framebuffer to user space. */ 119 int exynos_drm_gem_dumb_map_offset(struct drm_file *file_priv, 120 struct drm_device *dev, uint32_t handle, 121 uint64_t *offset); 122 123 /* page fault handler and mmap fault address(virtual) to physical memory. */ 124 int exynos_drm_gem_fault(struct vm_area_struct *vma, struct vm_fault *vmf); 125 126 /* set vm_flags and we can change the vm attribute to other one at here. */ 127 int exynos_drm_gem_mmap(struct file *filp, struct vm_area_struct *vma); 128 129 static inline int vma_is_io(struct vm_area_struct *vma) 130 { 131 return !!(vma->vm_flags & (VM_IO | VM_PFNMAP)); 132 } 133 134 /* get a copy of a virtual memory region. */ 135 struct vm_area_struct *exynos_gem_get_vma(struct vm_area_struct *vma); 136 137 /* release a userspace virtual memory area. */ 138 void exynos_gem_put_vma(struct vm_area_struct *vma); 139 140 /* get pages from user space. */ 141 int exynos_gem_get_pages_from_userptr(unsigned long start, 142 unsigned int npages, 143 struct page **pages, 144 struct vm_area_struct *vma); 145 146 /* drop the reference to pages. */ 147 void exynos_gem_put_pages_to_userptr(struct page **pages, 148 unsigned int npages, 149 struct vm_area_struct *vma); 150 151 /* map sgt with dma region. */ 152 int exynos_gem_map_sgt_with_dma(struct drm_device *drm_dev, 153 struct sg_table *sgt, 154 enum dma_data_direction dir); 155 156 /* unmap sgt from dma region. */ 157 void exynos_gem_unmap_sgt_from_dma(struct drm_device *drm_dev, 158 struct sg_table *sgt, 159 enum dma_data_direction dir); 160 161 /* low-level interface prime helpers */ 162 struct sg_table *exynos_drm_gem_prime_get_sg_table(struct drm_gem_object *obj); 163 struct drm_gem_object * 164 exynos_drm_gem_prime_import_sg_table(struct drm_device *dev, 165 struct dma_buf_attachment *attach, 166 struct sg_table *sgt); 167 void *exynos_drm_gem_prime_vmap(struct drm_gem_object *obj); 168 void exynos_drm_gem_prime_vunmap(struct drm_gem_object *obj, void *vaddr); 169 170 #endif 171