1 /* SPDX-License-Identifier: GPL-2.0 */
2
3 #ifndef __DRM_GEM_SHMEM_HELPER_H__
4 #define __DRM_GEM_SHMEM_HELPER_H__
5
6 #include <linux/fs.h>
7 #include <linux/mm.h>
8 #include <linux/mutex.h>
9
10 #include <drm/drm_file.h>
11 #include <drm/drm_gem.h>
12 #include <drm/drm_ioctl.h>
13 #include <drm/drm_prime.h>
14
15 struct dma_buf_attachment;
16 struct drm_mode_create_dumb;
17 struct drm_printer;
18 struct sg_table;
19
20 /**
21 * struct drm_gem_shmem_object - GEM object backed by shmem
22 */
23 struct drm_gem_shmem_object {
24 /**
25 * @base: Base GEM object
26 */
27 struct drm_gem_object base;
28
29 /**
30 * @pages_lock: Protects the page table and use count
31 */
32 struct mutex pages_lock;
33
34 /**
35 * @pages: Page table
36 */
37 struct page **pages;
38
39 /**
40 * @pages_use_count:
41 *
42 * Reference count on the pages table.
43 * The pages are put when the count reaches zero.
44 */
45 unsigned int pages_use_count;
46
47 /**
48 * @madv: State for madvise
49 *
50 * 0 is active/inuse.
51 * A negative value is the object is purged.
52 * Positive values are driver specific and not used by the helpers.
53 */
54 int madv;
55
56 /**
57 * @madv_list: List entry for madvise tracking
58 *
59 * Typically used by drivers to track purgeable objects
60 */
61 struct list_head madv_list;
62
63 /**
64 * @pages_mark_dirty_on_put:
65 *
66 * Mark pages as dirty when they are put.
67 */
68 unsigned int pages_mark_dirty_on_put : 1;
69
70 /**
71 * @pages_mark_accessed_on_put:
72 *
73 * Mark pages as accessed when they are put.
74 */
75 unsigned int pages_mark_accessed_on_put : 1;
76
77 /**
78 * @sgt: Scatter/gather table for imported PRIME buffers
79 */
80 struct sg_table *sgt;
81
82 /**
83 * @vmap_lock: Protects the vmap address and use count
84 */
85 struct mutex vmap_lock;
86
87 /**
88 * @vaddr: Kernel virtual address of the backing memory
89 */
90 void *vaddr;
91
92 /**
93 * @vmap_use_count:
94 *
95 * Reference count on the virtual address.
96 * The address are un-mapped when the count reaches zero.
97 */
98 unsigned int vmap_use_count;
99
100 /**
101 * @map_cached: map object cached (instead of using writecombine).
102 */
103 bool map_cached;
104 };
105
106 #define to_drm_gem_shmem_obj(obj) \
107 container_of(obj, struct drm_gem_shmem_object, base)
108
109 struct drm_gem_shmem_object *drm_gem_shmem_create(struct drm_device *dev, size_t size);
110 void drm_gem_shmem_free_object(struct drm_gem_object *obj);
111
112 int drm_gem_shmem_get_pages(struct drm_gem_shmem_object *shmem);
113 void drm_gem_shmem_put_pages(struct drm_gem_shmem_object *shmem);
114 int drm_gem_shmem_pin(struct drm_gem_object *obj);
115 void drm_gem_shmem_unpin(struct drm_gem_object *obj);
116 void *drm_gem_shmem_vmap(struct drm_gem_object *obj);
117 void drm_gem_shmem_vunmap(struct drm_gem_object *obj, void *vaddr);
118
119 int drm_gem_shmem_madvise(struct drm_gem_object *obj, int madv);
120
drm_gem_shmem_is_purgeable(struct drm_gem_shmem_object * shmem)121 static inline bool drm_gem_shmem_is_purgeable(struct drm_gem_shmem_object *shmem)
122 {
123 return (shmem->madv > 0) &&
124 !shmem->vmap_use_count && shmem->sgt &&
125 !shmem->base.dma_buf && !shmem->base.import_attach;
126 }
127
128 void drm_gem_shmem_purge_locked(struct drm_gem_object *obj);
129 bool drm_gem_shmem_purge(struct drm_gem_object *obj);
130
131 struct drm_gem_shmem_object *
132 drm_gem_shmem_create_with_handle(struct drm_file *file_priv,
133 struct drm_device *dev, size_t size,
134 uint32_t *handle);
135
136 struct drm_gem_object *
137 drm_gem_shmem_create_object_cached(struct drm_device *dev, size_t size);
138
139 int drm_gem_shmem_dumb_create(struct drm_file *file, struct drm_device *dev,
140 struct drm_mode_create_dumb *args);
141
142 int drm_gem_shmem_mmap(struct drm_gem_object *obj, struct vm_area_struct *vma);
143
144 void drm_gem_shmem_print_info(struct drm_printer *p, unsigned int indent,
145 const struct drm_gem_object *obj);
146
147 struct sg_table *drm_gem_shmem_get_sg_table(struct drm_gem_object *obj);
148 struct drm_gem_object *
149 drm_gem_shmem_prime_import_sg_table(struct drm_device *dev,
150 struct dma_buf_attachment *attach,
151 struct sg_table *sgt);
152
153 struct sg_table *drm_gem_shmem_get_pages_sgt(struct drm_gem_object *obj);
154
155 /**
156 * DRM_GEM_SHMEM_DRIVER_OPS - Default shmem GEM operations
157 *
158 * This macro provides a shortcut for setting the shmem GEM operations in
159 * the &drm_driver structure.
160 */
161 #define DRM_GEM_SHMEM_DRIVER_OPS \
162 .prime_handle_to_fd = drm_gem_prime_handle_to_fd, \
163 .prime_fd_to_handle = drm_gem_prime_fd_to_handle, \
164 .gem_prime_import_sg_table = drm_gem_shmem_prime_import_sg_table, \
165 .gem_prime_mmap = drm_gem_prime_mmap, \
166 .dumb_create = drm_gem_shmem_dumb_create
167
168 #endif /* __DRM_GEM_SHMEM_HELPER_H__ */
169
