1 /* SPDX-License-Identifier: GPL-2.0-or-later */
3 #ifndef DRM_GEM_VRAM_HELPER_H
4 #define DRM_GEM_VRAM_HELPER_H
6 #include <drm/drm_file.h>
7 #include <drm/drm_gem.h>
8 #include <drm/drm_ioctl.h>
9 #include <drm/ttm/ttm_bo_api.h>
10 #include <drm/ttm/ttm_bo_driver.h>
11 #include <drm/ttm/ttm_placement.h>
13 #include <linux/kernel.h> /* for container_of() */
15 struct drm_mode_create_dumb;
16 struct drm_vram_mm_funcs;
18 struct vm_area_struct;
20 #define DRM_GEM_VRAM_PL_FLAG_VRAM TTM_PL_FLAG_VRAM
21 #define DRM_GEM_VRAM_PL_FLAG_SYSTEM TTM_PL_FLAG_SYSTEM
22 #define DRM_GEM_VRAM_PL_FLAG_TOPDOWN TTM_PL_FLAG_TOPDOWN
25 * Buffer-object helpers
29 * struct drm_gem_vram_object - GEM object backed by VRAM
31 * @bo: TTM buffer object
32 * @kmap: Mapping information for @bo
33 * @placement: TTM placement information. Supported placements are \
34 %TTM_PL_VRAM and %TTM_PL_SYSTEM
35 * @placements: TTM placement information.
36 * @pin_count: Pin counter
38 * The type struct drm_gem_vram_object represents a GEM object that is
39 * backed by VRAM. It can be used for simple framebuffer devices with
40 * dedicated memory. The buffer object can be evicted to system memory if
41 * video memory becomes scarce.
43 * GEM VRAM objects perform reference counting for pin and mapping
44 * operations. So a buffer object that has been pinned N times with
45 * drm_gem_vram_pin() must be unpinned N times with
46 * drm_gem_vram_unpin(). The same applies to pairs of
47 * drm_gem_vram_kmap() and drm_gem_vram_kunmap(), as well as pairs of
48 * drm_gem_vram_vmap() and drm_gem_vram_vunmap().
50 struct drm_gem_vram_object {
51 struct ttm_buffer_object bo;
52 struct ttm_bo_kmap_obj kmap;
57 * Reference count on the virtual address.
58 * The address are un-mapped when the count reaches zero.
60 unsigned int kmap_use_count;
62 /* Supported placements are %TTM_PL_VRAM and %TTM_PL_SYSTEM */
63 struct ttm_placement placement;
64 struct ttm_place placements[2];
70 * Returns the container of type &struct drm_gem_vram_object
72 * @bo: the VRAM buffer object
73 * Returns: The containing GEM VRAM object
75 static inline struct drm_gem_vram_object *drm_gem_vram_of_bo(
76 struct ttm_buffer_object *bo)
78 return container_of(bo, struct drm_gem_vram_object, bo);
82 * Returns the container of type &struct drm_gem_vram_object
84 * @gem: the GEM object
85 * Returns: The containing GEM VRAM object
87 static inline struct drm_gem_vram_object *drm_gem_vram_of_gem(
88 struct drm_gem_object *gem)
90 return container_of(gem, struct drm_gem_vram_object, bo.base);
93 struct drm_gem_vram_object *drm_gem_vram_create(struct drm_device *dev,
94 struct ttm_bo_device *bdev,
96 unsigned long pg_align,
98 void drm_gem_vram_put(struct drm_gem_vram_object *gbo);
99 u64 drm_gem_vram_mmap_offset(struct drm_gem_vram_object *gbo);
100 s64 drm_gem_vram_offset(struct drm_gem_vram_object *gbo);
101 int drm_gem_vram_pin(struct drm_gem_vram_object *gbo, unsigned long pl_flag);
102 int drm_gem_vram_unpin(struct drm_gem_vram_object *gbo);
103 void *drm_gem_vram_kmap(struct drm_gem_vram_object *gbo, bool map,
105 void drm_gem_vram_kunmap(struct drm_gem_vram_object *gbo);
106 void *drm_gem_vram_vmap(struct drm_gem_vram_object *gbo);
107 void drm_gem_vram_vunmap(struct drm_gem_vram_object *gbo, void *vaddr);
109 int drm_gem_vram_fill_create_dumb(struct drm_file *file,
110 struct drm_device *dev,
111 struct ttm_bo_device *bdev,
112 unsigned long pg_align,
114 struct drm_mode_create_dumb *args);
117 * Helpers for struct drm_driver
120 int drm_gem_vram_driver_dumb_create(struct drm_file *file,
121 struct drm_device *dev,
122 struct drm_mode_create_dumb *args);
123 int drm_gem_vram_driver_dumb_mmap_offset(struct drm_file *file,
124 struct drm_device *dev,
125 uint32_t handle, uint64_t *offset);
128 * define DRM_GEM_VRAM_DRIVER - default callback functions for \
131 * Drivers that use VRAM MM and GEM VRAM can use this macro to initialize
132 * &struct drm_driver with default functions.
134 #define DRM_GEM_VRAM_DRIVER \
135 .debugfs_init = drm_vram_mm_debugfs_init, \
136 .dumb_create = drm_gem_vram_driver_dumb_create, \
137 .dumb_map_offset = drm_gem_vram_driver_dumb_mmap_offset, \
138 .gem_prime_mmap = drm_gem_prime_mmap
141 * VRAM memory manager
145 * struct drm_vram_mm - An instance of VRAM MM
146 * @vram_base: Base address of the managed video memory
147 * @vram_size: Size of the managed video memory in bytes
148 * @bdev: The TTM BO device.
149 * @funcs: TTM BO functions
151 * The fields &struct drm_vram_mm.vram_base and
152 * &struct drm_vram_mm.vrm_size are managed by VRAM MM, but are
153 * available for public read access. Use the field
154 * &struct drm_vram_mm.bdev to access the TTM BO device.
160 struct ttm_bo_device bdev;
164 * drm_vram_mm_of_bdev() - \
165 Returns the container of type &struct ttm_bo_device for field bdev.
166 * @bdev: the TTM BO device
169 * The containing instance of &struct drm_vram_mm
171 static inline struct drm_vram_mm *drm_vram_mm_of_bdev(
172 struct ttm_bo_device *bdev)
174 return container_of(bdev, struct drm_vram_mm, bdev);
177 int drm_vram_mm_debugfs_init(struct drm_minor *minor);
180 * Helpers for integration with struct drm_device
183 struct drm_vram_mm *drm_vram_helper_alloc_mm(
184 struct drm_device *dev, uint64_t vram_base, size_t vram_size);
185 void drm_vram_helper_release_mm(struct drm_device *dev);