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: Page table
31 */
32 struct page **pages;
33
34 /**
35 * @pages_use_count:
36 *
37 * Reference count on the pages table.
38 * The pages are put when the count reaches zero.
39 */
40 unsigned int pages_use_count;
41
42 /**
43 * @madv: State for madvise
44 *
45 * 0 is active/inuse.
46 * A negative value is the object is purged.
47 * Positive values are driver specific and not used by the helpers.
48 */
49 int madv;
50
51 /**
52 * @madv_list: List entry for madvise tracking
53 *
54 * Typically used by drivers to track purgeable objects
55 */
56 struct list_head madv_list;
57
58 /**
59 * @sgt: Scatter/gather table for imported PRIME buffers
60 */
61 struct sg_table *sgt;
62
63 /**
64 * @vaddr: Kernel virtual address of the backing memory
65 */
66 void *vaddr;
67
68 /**
69 * @vmap_use_count:
70 *
71 * Reference count on the virtual address.
72 * The address are un-mapped when the count reaches zero.
73 */
74 unsigned int vmap_use_count;
75
76 /**
77 * @pages_mark_dirty_on_put:
78 *
79 * Mark pages as dirty when they are put.
80 */
81 bool pages_mark_dirty_on_put : 1;
82
83 /**
84 * @pages_mark_accessed_on_put:
85 *
86 * Mark pages as accessed when they are put.
87 */
88 bool pages_mark_accessed_on_put : 1;
89
90 /**
91 * @map_wc: map object write-combined (instead of using shmem defaults).
92 */
93 bool map_wc : 1;
94 };
95
96 #define to_drm_gem_shmem_obj(obj) \
97 container_of(obj, struct drm_gem_shmem_object, base)
98
99 struct drm_gem_shmem_object *drm_gem_shmem_create(struct drm_device *dev, size_t size);
100 void drm_gem_shmem_free(struct drm_gem_shmem_object *shmem);
101
102 void drm_gem_shmem_put_pages(struct drm_gem_shmem_object *shmem);
103 int drm_gem_shmem_pin(struct drm_gem_shmem_object *shmem);
104 void drm_gem_shmem_unpin(struct drm_gem_shmem_object *shmem);
105 int drm_gem_shmem_vmap(struct drm_gem_shmem_object *shmem,
106 struct iosys_map *map);
107 void drm_gem_shmem_vunmap(struct drm_gem_shmem_object *shmem,
108 struct iosys_map *map);
109 int drm_gem_shmem_mmap(struct drm_gem_shmem_object *shmem, struct vm_area_struct *vma);
110
111 int drm_gem_shmem_pin_locked(struct drm_gem_shmem_object *shmem);
112 void drm_gem_shmem_unpin_locked(struct drm_gem_shmem_object *shmem);
113
114 int drm_gem_shmem_madvise(struct drm_gem_shmem_object *shmem, int madv);
115
116 static inline bool drm_gem_shmem_is_purgeable(struct drm_gem_shmem_object *shmem)
117 {
118 return (shmem->madv > 0) &&
119 !shmem->vmap_use_count && shmem->sgt &&
120 !shmem->base.dma_buf && !shmem->base.import_attach;
121 }
122
123 void drm_gem_shmem_purge(struct drm_gem_shmem_object *shmem);
124
125 struct sg_table *drm_gem_shmem_get_sg_table(struct drm_gem_shmem_object *shmem);
126 struct sg_table *drm_gem_shmem_get_pages_sgt(struct drm_gem_shmem_object *shmem);
127
128 void drm_gem_shmem_print_info(const struct drm_gem_shmem_object *shmem,
129 struct drm_printer *p, unsigned int indent);
130
131 extern const struct vm_operations_struct drm_gem_shmem_vm_ops;
132
133 /*
134 * GEM object functions
135 */
136
137 /**
138 * drm_gem_shmem_object_free - GEM object function for drm_gem_shmem_free()
139 * @obj: GEM object to free
140 *
141 * This function wraps drm_gem_shmem_free(). Drivers that employ the shmem helpers
142 * should use it as their &drm_gem_object_funcs.free handler.
143 */
144 static inline void drm_gem_shmem_object_free(struct drm_gem_object *obj)
145 {
146 struct drm_gem_shmem_object *shmem = to_drm_gem_shmem_obj(obj);
147
148 drm_gem_shmem_free(shmem);
149 }
150
151 /**
152 * drm_gem_shmem_object_print_info() - Print &drm_gem_shmem_object info for debugfs
153 * @p: DRM printer
154 * @indent: Tab indentation level
155 * @obj: GEM object
156 *
157 * This function wraps drm_gem_shmem_print_info(). Drivers that employ the shmem helpers should
158 * use this function as their &drm_gem_object_funcs.print_info handler.
159 */
160 static inline void drm_gem_shmem_object_print_info(struct drm_printer *p, unsigned int indent,
161 const struct drm_gem_object *obj)
162 {
163 const struct drm_gem_shmem_object *shmem = to_drm_gem_shmem_obj(obj);
164
165 drm_gem_shmem_print_info(shmem, p, indent);
166 }
167
168 /**
169 * drm_gem_shmem_object_pin - GEM object function for drm_gem_shmem_pin()
170 * @obj: GEM object
171 *
172 * This function wraps drm_gem_shmem_pin(). Drivers that employ the shmem helpers should
173 * use it as their &drm_gem_object_funcs.pin handler.
174 */
175 static inline int drm_gem_shmem_object_pin(struct drm_gem_object *obj)
176 {
177 struct drm_gem_shmem_object *shmem = to_drm_gem_shmem_obj(obj);
178
179 return drm_gem_shmem_pin_locked(shmem);
180 }
181
182 /**
183 * drm_gem_shmem_object_unpin - GEM object function for drm_gem_shmem_unpin()
184 * @obj: GEM object
185 *
186 * This function wraps drm_gem_shmem_unpin(). Drivers that employ the shmem helpers should
187 * use it as their &drm_gem_object_funcs.unpin handler.
188 */
189 static inline void drm_gem_shmem_object_unpin(struct drm_gem_object *obj)
190 {
191 struct drm_gem_shmem_object *shmem = to_drm_gem_shmem_obj(obj);
192
193 drm_gem_shmem_unpin_locked(shmem);
194 }
195
196 /**
197 * drm_gem_shmem_object_get_sg_table - GEM object function for drm_gem_shmem_get_sg_table()
198 * @obj: GEM object
199 *
200 * This function wraps drm_gem_shmem_get_sg_table(). Drivers that employ the shmem helpers should
201 * use it as their &drm_gem_object_funcs.get_sg_table handler.
202 *
203 * Returns:
204 * A pointer to the scatter/gather table of pinned pages or error pointer on failure.
205 */
206 static inline struct sg_table *drm_gem_shmem_object_get_sg_table(struct drm_gem_object *obj)
207 {
208 struct drm_gem_shmem_object *shmem = to_drm_gem_shmem_obj(obj);
209
210 return drm_gem_shmem_get_sg_table(shmem);
211 }
212
213 /*
214 * drm_gem_shmem_object_vmap - GEM object function for drm_gem_shmem_vmap()
215 * @obj: GEM object
216 * @map: Returns the kernel virtual address of the SHMEM GEM object's backing store.
217 *
218 * This function wraps drm_gem_shmem_vmap(). Drivers that employ the shmem helpers should
219 * use it as their &drm_gem_object_funcs.vmap handler.
220 *
221 * Returns:
222 * 0 on success or a negative error code on failure.
223 */
224 static inline int drm_gem_shmem_object_vmap(struct drm_gem_object *obj,
225 struct iosys_map *map)
226 {
227 struct drm_gem_shmem_object *shmem = to_drm_gem_shmem_obj(obj);
228
229 return drm_gem_shmem_vmap(shmem, map);
230 }
231
232 /*
233 * drm_gem_shmem_object_vunmap - GEM object function for drm_gem_shmem_vunmap()
234 * @obj: GEM object
235 * @map: Kernel virtual address where the SHMEM GEM object was mapped
236 *
237 * This function wraps drm_gem_shmem_vunmap(). Drivers that employ the shmem helpers should
238 * use it as their &drm_gem_object_funcs.vunmap handler.
239 */
240 static inline void drm_gem_shmem_object_vunmap(struct drm_gem_object *obj,
241 struct iosys_map *map)
242 {
243 struct drm_gem_shmem_object *shmem = to_drm_gem_shmem_obj(obj);
244
245 drm_gem_shmem_vunmap(shmem, map);
246 }
247
248 /**
249 * drm_gem_shmem_object_mmap - GEM object function for drm_gem_shmem_mmap()
250 * @obj: GEM object
251 * @vma: VMA for the area to be mapped
252 *
253 * This function wraps drm_gem_shmem_mmap(). Drivers that employ the shmem helpers should
254 * use it as their &drm_gem_object_funcs.mmap handler.
255 *
256 * Returns:
257 * 0 on success or a negative error code on failure.
258 */
259 static inline int drm_gem_shmem_object_mmap(struct drm_gem_object *obj, struct vm_area_struct *vma)
260 {
261 struct drm_gem_shmem_object *shmem = to_drm_gem_shmem_obj(obj);
262
263 return drm_gem_shmem_mmap(shmem, vma);
264 }
265
266 /*
267 * Driver ops
268 */
269
270 struct drm_gem_object *
271 drm_gem_shmem_prime_import_sg_table(struct drm_device *dev,
272 struct dma_buf_attachment *attach,
273 struct sg_table *sgt);
274 int drm_gem_shmem_dumb_create(struct drm_file *file, struct drm_device *dev,
275 struct drm_mode_create_dumb *args);
276
277 /**
278 * DRM_GEM_SHMEM_DRIVER_OPS - Default shmem GEM operations
279 *
280 * This macro provides a shortcut for setting the shmem GEM operations in
281 * the &drm_driver structure.
282 */
283 #define DRM_GEM_SHMEM_DRIVER_OPS \
284 .gem_prime_import_sg_table = drm_gem_shmem_prime_import_sg_table, \
285 .dumb_create = drm_gem_shmem_dumb_create
286
287 #endif /* __DRM_GEM_SHMEM_HELPER_H__ */
288
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