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
24 * Buffer-object helpers
28 * struct drm_gem_vram_object - GEM object backed by VRAM
30 * @bo: TTM buffer object
31 * @kmap: Mapping information for @bo
32 * @placement: TTM placement information. Supported placements are \
33 %TTM_PL_VRAM and %TTM_PL_SYSTEM
34 * @placements: TTM placement information.
35 * @pin_count: Pin counter
37 * The type struct drm_gem_vram_object represents a GEM object that is
38 * backed by VRAM. It can be used for simple framebuffer devices with
39 * dedicated memory. The buffer object can be evicted to system memory if
40 * video memory becomes scarce.
42 * GEM VRAM objects perform reference counting for pin and mapping
43 * operations. So a buffer object that has been pinned N times with
44 * drm_gem_vram_pin() must be unpinned N times with
45 * drm_gem_vram_unpin(). The same applies to pairs of
46 * drm_gem_vram_kmap() and drm_gem_vram_kunmap().
48 struct drm_gem_vram_object {
49 struct ttm_buffer_object bo;
50 struct ttm_bo_kmap_obj kmap;
55 * Reference count on the virtual address.
56 * The address are un-mapped when the count reaches zero.
58 unsigned int kmap_use_count;
60 /* Supported placements are %TTM_PL_VRAM and %TTM_PL_SYSTEM */
61 struct ttm_placement placement;
62 struct ttm_place placements[2];
68 * Returns the container of type &struct drm_gem_vram_object
70 * @bo: the VRAM buffer object
71 * Returns: The containing GEM VRAM object
73 static inline struct drm_gem_vram_object *drm_gem_vram_of_bo(
74 struct ttm_buffer_object *bo)
76 return container_of(bo, struct drm_gem_vram_object, bo);
80 * Returns the container of type &struct drm_gem_vram_object
82 * @gem: the GEM object
83 * Returns: The containing GEM VRAM object
85 static inline struct drm_gem_vram_object *drm_gem_vram_of_gem(
86 struct drm_gem_object *gem)
88 return container_of(gem, struct drm_gem_vram_object, bo.base);
91 struct drm_gem_vram_object *drm_gem_vram_create(struct drm_device *dev,
92 struct ttm_bo_device *bdev,
94 unsigned long pg_align,
96 void drm_gem_vram_put(struct drm_gem_vram_object *gbo);
97 u64 drm_gem_vram_mmap_offset(struct drm_gem_vram_object *gbo);
98 s64 drm_gem_vram_offset(struct drm_gem_vram_object *gbo);
99 int drm_gem_vram_pin(struct drm_gem_vram_object *gbo, unsigned long pl_flag);
100 int drm_gem_vram_unpin(struct drm_gem_vram_object *gbo);
101 void *drm_gem_vram_kmap(struct drm_gem_vram_object *gbo, bool map,
103 void drm_gem_vram_kunmap(struct drm_gem_vram_object *gbo);
105 int drm_gem_vram_fill_create_dumb(struct drm_file *file,
106 struct drm_device *dev,
107 struct ttm_bo_device *bdev,
108 unsigned long pg_align,
110 struct drm_mode_create_dumb *args);
113 * Helpers for struct drm_driver
116 int drm_gem_vram_driver_dumb_create(struct drm_file *file,
117 struct drm_device *dev,
118 struct drm_mode_create_dumb *args);
119 int drm_gem_vram_driver_dumb_mmap_offset(struct drm_file *file,
120 struct drm_device *dev,
121 uint32_t handle, uint64_t *offset);
124 * define DRM_GEM_VRAM_DRIVER - default callback functions for \
127 * Drivers that use VRAM MM and GEM VRAM can use this macro to initialize
128 * &struct drm_driver with default functions.
130 #define DRM_GEM_VRAM_DRIVER \
131 .debugfs_init = drm_vram_mm_debugfs_init, \
132 .dumb_create = drm_gem_vram_driver_dumb_create, \
133 .dumb_map_offset = drm_gem_vram_driver_dumb_mmap_offset, \
134 .gem_prime_mmap = drm_gem_prime_mmap
137 * VRAM memory manager
141 * struct drm_vram_mm - An instance of VRAM MM
142 * @vram_base: Base address of the managed video memory
143 * @vram_size: Size of the managed video memory in bytes
144 * @bdev: The TTM BO device.
145 * @funcs: TTM BO functions
147 * The fields &struct drm_vram_mm.vram_base and
148 * &struct drm_vram_mm.vrm_size are managed by VRAM MM, but are
149 * available for public read access. Use the field
150 * &struct drm_vram_mm.bdev to access the TTM BO device.
156 struct ttm_bo_device bdev;
160 * drm_vram_mm_of_bdev() - \
161 Returns the container of type &struct ttm_bo_device for field bdev.
162 * @bdev: the TTM BO device
165 * The containing instance of &struct drm_vram_mm
167 static inline struct drm_vram_mm *drm_vram_mm_of_bdev(
168 struct ttm_bo_device *bdev)
170 return container_of(bdev, struct drm_vram_mm, bdev);
173 int drm_vram_mm_debugfs_init(struct drm_minor *minor);
174 int drm_vram_mm_init(struct drm_vram_mm *vmm, struct drm_device *dev,
175 uint64_t vram_base, size_t vram_size);
176 void drm_vram_mm_cleanup(struct drm_vram_mm *vmm);
178 int drm_vram_mm_mmap(struct file *filp, struct vm_area_struct *vma,
179 struct drm_vram_mm *vmm);
182 * Helpers for integration with struct drm_device
185 struct drm_vram_mm *drm_vram_helper_alloc_mm(
186 struct drm_device *dev, uint64_t vram_base, size_t vram_size);
187 void drm_vram_helper_release_mm(struct drm_device *dev);
190 * Helpers for &struct file_operations
193 int drm_vram_mm_file_operations_mmap(
194 struct file *filp, struct vm_area_struct *vma);
197 * define DRM_VRAM_MM_FILE_OPERATIONS - default callback functions for \
198 &struct file_operations
200 * Drivers that use VRAM MM can use this macro to initialize
201 * &struct file_operations with default functions.
203 #define DRM_VRAM_MM_FILE_OPERATIONS \
204 .llseek = no_llseek, \
207 .unlocked_ioctl = drm_ioctl, \
208 .compat_ioctl = drm_compat_ioctl, \
209 .mmap = drm_vram_mm_file_operations_mmap, \
211 .release = drm_release \