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 * @buffer: a pointer to exynos_drm_gem_buffer object. 25 * - contain the information to memory region allocated 26 * by user request or at framebuffer creation. 27 * continuous memory region allocated by user request 28 * or at framebuffer creation. 29 * @flags: indicate memory type to allocated buffer and cache attruibute. 30 * @size: size requested from user, in bytes and this size is aligned 31 * in page unit. 32 * @cookie: cookie returned by dma_alloc_attrs 33 * @kvaddr: kernel virtual address to allocated memory region. 34 * @dma_addr: bus address(accessed by dma) to allocated memory region. 35 * - this address could be physical address without IOMMU and 36 * device address with IOMMU. 37 * @pages: Array of backing pages. 38 * @sgt: Imported sg_table. 39 * 40 * P.S. this object would be transferred to user as kms_bo.handle so 41 * user can access the buffer through kms_bo.handle. 42 */ 43 struct exynos_drm_gem { 44 struct drm_gem_object base; 45 unsigned int flags; 46 unsigned long size; 47 void *cookie; 48 void __iomem *kvaddr; 49 dma_addr_t dma_addr; 50 unsigned long dma_attrs; 51 struct page **pages; 52 struct sg_table *sgt; 53 }; 54 55 /* destroy a buffer with gem object */ 56 void exynos_drm_gem_destroy(struct exynos_drm_gem *exynos_gem); 57 58 /* create a new buffer with gem object */ 59 struct exynos_drm_gem *exynos_drm_gem_create(struct drm_device *dev, 60 unsigned int flags, 61 unsigned long size); 62 63 /* 64 * request gem object creation and buffer allocation as the size 65 * that it is calculated with framebuffer information such as width, 66 * height and bpp. 67 */ 68 int exynos_drm_gem_create_ioctl(struct drm_device *dev, void *data, 69 struct drm_file *file_priv); 70 71 /* get fake-offset of gem object that can be used with mmap. */ 72 int exynos_drm_gem_map_ioctl(struct drm_device *dev, void *data, 73 struct drm_file *file_priv); 74 75 /* 76 * get exynos drm object from gem handle, this function could be used for 77 * other drivers such as 2d/3d acceleration drivers. 78 * with this function call, gem object reference count would be increased. 79 */ 80 struct exynos_drm_gem *exynos_drm_gem_get(struct drm_file *filp, 81 unsigned int gem_handle); 82 83 /* 84 * put exynos drm object acquired from exynos_drm_gem_get(), 85 * gem object reference count would be decreased. 86 */ 87 static inline void exynos_drm_gem_put(struct exynos_drm_gem *exynos_gem) 88 { 89 drm_gem_object_put_unlocked(&exynos_gem->base); 90 } 91 92 /* get buffer information to memory region allocated by gem. */ 93 int exynos_drm_gem_get_ioctl(struct drm_device *dev, void *data, 94 struct drm_file *file_priv); 95 96 /* free gem object. */ 97 void exynos_drm_gem_free_object(struct drm_gem_object *obj); 98 99 /* create memory region for drm framebuffer. */ 100 int exynos_drm_gem_dumb_create(struct drm_file *file_priv, 101 struct drm_device *dev, 102 struct drm_mode_create_dumb *args); 103 104 /* page fault handler and mmap fault address(virtual) to physical memory. */ 105 vm_fault_t exynos_drm_gem_fault(struct vm_fault *vmf); 106 107 /* set vm_flags and we can change the vm attribute to other one at here. */ 108 int exynos_drm_gem_mmap(struct file *filp, struct vm_area_struct *vma); 109 110 /* low-level interface prime helpers */ 111 struct drm_gem_object *exynos_drm_gem_prime_import(struct drm_device *dev, 112 struct dma_buf *dma_buf); 113 struct sg_table *exynos_drm_gem_prime_get_sg_table(struct drm_gem_object *obj); 114 struct drm_gem_object * 115 exynos_drm_gem_prime_import_sg_table(struct drm_device *dev, 116 struct dma_buf_attachment *attach, 117 struct sg_table *sgt); 118 void *exynos_drm_gem_prime_vmap(struct drm_gem_object *obj); 119 void exynos_drm_gem_prime_vunmap(struct drm_gem_object *obj, void *vaddr); 120 int exynos_drm_gem_prime_mmap(struct drm_gem_object *obj, 121 struct vm_area_struct *vma); 122 123 #endif 124