1 | #ifndef __DRM_GEM_H__ |
2 | #define __DRM_GEM_H__ |
3 | |
4 | /* |
5 | * GEM Graphics Execution Manager Driver Interfaces |
6 | * |
7 | * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas. |
8 | * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California. |
9 | * Copyright (c) 2009-2010, Code Aurora Forum. |
10 | * All rights reserved. |
11 | * Copyright © 2014 Intel Corporation |
12 | * Daniel Vetter <daniel.vetter@ffwll.ch> |
13 | * |
14 | * Author: Rickard E. (Rik) Faith <faith@valinux.com> |
15 | * Author: Gareth Hughes <gareth@valinux.com> |
16 | * |
17 | * Permission is hereby granted, free of charge, to any person obtaining a |
18 | * copy of this software and associated documentation files (the "Software"), |
19 | * to deal in the Software without restriction, including without limitation |
20 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
21 | * and/or sell copies of the Software, and to permit persons to whom the |
22 | * Software is furnished to do so, subject to the following conditions: |
23 | * |
24 | * The above copyright notice and this permission notice (including the next |
25 | * paragraph) shall be included in all copies or substantial portions of the |
26 | * Software. |
27 | * |
28 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
29 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
30 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
31 | * VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR |
32 | * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, |
33 | * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR |
34 | * OTHER DEALINGS IN THE SOFTWARE. |
35 | */ |
36 | |
37 | #include <linux/kref.h> |
38 | |
39 | #include <drm/drm_vma_manager.h> |
40 | |
41 | struct drm_gem_object; |
42 | |
43 | /** |
44 | * struct drm_gem_object_funcs - GEM object functions |
45 | */ |
46 | struct drm_gem_object_funcs { |
47 | /** |
48 | * @free: |
49 | * |
50 | * Deconstructor for drm_gem_objects. |
51 | * |
52 | * This callback is mandatory. |
53 | */ |
54 | void (*free)(struct drm_gem_object *obj); |
55 | |
56 | /** |
57 | * @open: |
58 | * |
59 | * Called upon GEM handle creation. |
60 | * |
61 | * This callback is optional. |
62 | */ |
63 | int (*open)(struct drm_gem_object *obj, struct drm_file *file); |
64 | |
65 | /** |
66 | * @close: |
67 | * |
68 | * Called upon GEM handle release. |
69 | * |
70 | * This callback is optional. |
71 | */ |
72 | void (*close)(struct drm_gem_object *obj, struct drm_file *file); |
73 | |
74 | /** |
75 | * @print_info: |
76 | * |
77 | * If driver subclasses struct &drm_gem_object, it can implement this |
78 | * optional hook for printing additional driver specific info. |
79 | * |
80 | * drm_printf_indent() should be used in the callback passing it the |
81 | * indent argument. |
82 | * |
83 | * This callback is called from drm_gem_print_info(). |
84 | * |
85 | * This callback is optional. |
86 | */ |
87 | void (*print_info)(struct drm_printer *p, unsigned int indent, |
88 | const struct drm_gem_object *obj); |
89 | |
90 | /** |
91 | * @export: |
92 | * |
93 | * Export backing buffer as a &dma_buf. |
94 | * If this is not set drm_gem_prime_export() is used. |
95 | * |
96 | * This callback is optional. |
97 | */ |
98 | struct dma_buf *(*export)(struct drm_gem_object *obj, int flags); |
99 | |
100 | /** |
101 | * @pin: |
102 | * |
103 | * Pin backing buffer in memory. |
104 | * |
105 | * This callback is optional. |
106 | */ |
107 | int (*pin)(struct drm_gem_object *obj); |
108 | |
109 | /** |
110 | * @unpin: |
111 | * |
112 | * Unpin backing buffer. |
113 | * |
114 | * This callback is optional. |
115 | */ |
116 | void (*unpin)(struct drm_gem_object *obj); |
117 | |
118 | /** |
119 | * @get_sg_table: |
120 | * |
121 | * Returns a Scatter-Gather table representation of the buffer. |
122 | * Used when exporting a buffer. |
123 | * |
124 | * This callback is mandatory if buffer export is supported. |
125 | */ |
126 | struct sg_table *(*get_sg_table)(struct drm_gem_object *obj); |
127 | |
128 | /** |
129 | * @vmap: |
130 | * |
131 | * Returns a virtual address for the buffer. |
132 | * |
133 | * This callback is optional. |
134 | */ |
135 | void *(*vmap)(struct drm_gem_object *obj); |
136 | |
137 | /** |
138 | * @vunmap: |
139 | * |
140 | * Releases the the address previously returned by @vmap. |
141 | * |
142 | * This callback is optional. |
143 | */ |
144 | void (*vunmap)(struct drm_gem_object *obj, void *vaddr); |
145 | |
146 | /** |
147 | * @vm_ops: |
148 | * |
149 | * Virtual memory operations used with mmap. |
150 | * |
151 | * This is optional but necessary for mmap support. |
152 | */ |
153 | const struct vm_operations_struct *vm_ops; |
154 | }; |
155 | |
156 | /** |
157 | * struct drm_gem_object - GEM buffer object |
158 | * |
159 | * This structure defines the generic parts for GEM buffer objects, which are |
160 | * mostly around handling mmap and userspace handles. |
161 | * |
162 | * Buffer objects are often abbreviated to BO. |
163 | */ |
164 | struct drm_gem_object { |
165 | /** |
166 | * @refcount: |
167 | * |
168 | * Reference count of this object |
169 | * |
170 | * Please use drm_gem_object_get() to acquire and drm_gem_object_put() |
171 | * or drm_gem_object_put_unlocked() to release a reference to a GEM |
172 | * buffer object. |
173 | */ |
174 | struct kref refcount; |
175 | |
176 | /** |
177 | * @handle_count: |
178 | * |
179 | * This is the GEM file_priv handle count of this object. |
180 | * |
181 | * Each handle also holds a reference. Note that when the handle_count |
182 | * drops to 0 any global names (e.g. the id in the flink namespace) will |
183 | * be cleared. |
184 | * |
185 | * Protected by &drm_device.object_name_lock. |
186 | */ |
187 | unsigned handle_count; |
188 | |
189 | /** |
190 | * @dev: DRM dev this object belongs to. |
191 | */ |
192 | struct drm_device *dev; |
193 | |
194 | /** |
195 | * @filp: |
196 | * |
197 | * SHMEM file node used as backing storage for swappable buffer objects. |
198 | * GEM also supports driver private objects with driver-specific backing |
199 | * storage (contiguous CMA memory, special reserved blocks). In this |
200 | * case @filp is NULL. |
201 | */ |
202 | struct file *filp; |
203 | |
204 | /** |
205 | * @vma_node: |
206 | * |
207 | * Mapping info for this object to support mmap. Drivers are supposed to |
208 | * allocate the mmap offset using drm_gem_create_mmap_offset(). The |
209 | * offset itself can be retrieved using drm_vma_node_offset_addr(). |
210 | * |
211 | * Memory mapping itself is handled by drm_gem_mmap(), which also checks |
212 | * that userspace is allowed to access the object. |
213 | */ |
214 | struct drm_vma_offset_node vma_node; |
215 | |
216 | /** |
217 | * @size: |
218 | * |
219 | * Size of the object, in bytes. Immutable over the object's |
220 | * lifetime. |
221 | */ |
222 | size_t size; |
223 | |
224 | /** |
225 | * @name: |
226 | * |
227 | * Global name for this object, starts at 1. 0 means unnamed. |
228 | * Access is covered by &drm_device.object_name_lock. This is used by |
229 | * the GEM_FLINK and GEM_OPEN ioctls. |
230 | */ |
231 | int name; |
232 | |
233 | /** |
234 | * @dma_buf: |
235 | * |
236 | * dma-buf associated with this GEM object. |
237 | * |
238 | * Pointer to the dma-buf associated with this gem object (either |
239 | * through importing or exporting). We break the resulting reference |
240 | * loop when the last gem handle for this object is released. |
241 | * |
242 | * Protected by &drm_device.object_name_lock. |
243 | */ |
244 | struct dma_buf *dma_buf; |
245 | |
246 | /** |
247 | * @import_attach: |
248 | * |
249 | * dma-buf attachment backing this object. |
250 | * |
251 | * Any foreign dma_buf imported as a gem object has this set to the |
252 | * attachment point for the device. This is invariant over the lifetime |
253 | * of a gem object. |
254 | * |
255 | * The &drm_driver.gem_free_object callback is responsible for cleaning |
256 | * up the dma_buf attachment and references acquired at import time. |
257 | * |
258 | * Note that the drm gem/prime core does not depend upon drivers setting |
259 | * this field any more. So for drivers where this doesn't make sense |
260 | * (e.g. virtual devices or a displaylink behind an usb bus) they can |
261 | * simply leave it as NULL. |
262 | */ |
263 | struct dma_buf_attachment *import_attach; |
264 | |
265 | /** |
266 | * @funcs: |
267 | * |
268 | * Optional GEM object functions. If this is set, it will be used instead of the |
269 | * corresponding &drm_driver GEM callbacks. |
270 | * |
271 | * New drivers should use this. |
272 | * |
273 | */ |
274 | const struct drm_gem_object_funcs *funcs; |
275 | }; |
276 | |
277 | /** |
278 | * DEFINE_DRM_GEM_FOPS() - macro to generate file operations for GEM drivers |
279 | * @name: name for the generated structure |
280 | * |
281 | * This macro autogenerates a suitable &struct file_operations for GEM based |
282 | * drivers, which can be assigned to &drm_driver.fops. Note that this structure |
283 | * cannot be shared between drivers, because it contains a reference to the |
284 | * current module using THIS_MODULE. |
285 | * |
286 | * Note that the declaration is already marked as static - if you need a |
287 | * non-static version of this you're probably doing it wrong and will break the |
288 | * THIS_MODULE reference by accident. |
289 | */ |
290 | #define DEFINE_DRM_GEM_FOPS(name) \ |
291 | static const struct file_operations name = {\ |
292 | .owner = THIS_MODULE,\ |
293 | .open = drm_open,\ |
294 | .release = drm_release,\ |
295 | .unlocked_ioctl = drm_ioctl,\ |
296 | .compat_ioctl = drm_compat_ioctl,\ |
297 | .poll = drm_poll,\ |
298 | .read = drm_read,\ |
299 | .llseek = noop_llseek,\ |
300 | .mmap = drm_gem_mmap,\ |
301 | } |
302 | |
303 | void drm_gem_object_release(struct drm_gem_object *obj); |
304 | void drm_gem_object_free(struct kref *kref); |
305 | int drm_gem_object_init(struct drm_device *dev, |
306 | struct drm_gem_object *obj, size_t size); |
307 | void drm_gem_private_object_init(struct drm_device *dev, |
308 | struct drm_gem_object *obj, size_t size); |
309 | void drm_gem_vm_open(struct vm_area_struct *vma); |
310 | void drm_gem_vm_close(struct vm_area_struct *vma); |
311 | int drm_gem_mmap_obj(struct drm_gem_object *obj, unsigned long obj_size, |
312 | struct vm_area_struct *vma); |
313 | int drm_gem_mmap(struct file *filp, struct vm_area_struct *vma); |
314 | |
315 | /** |
316 | * drm_gem_object_get - acquire a GEM buffer object reference |
317 | * @obj: GEM buffer object |
318 | * |
319 | * This function acquires an additional reference to @obj. It is illegal to |
320 | * call this without already holding a reference. No locks required. |
321 | */ |
322 | static inline void drm_gem_object_get(struct drm_gem_object *obj) |
323 | { |
324 | kref_get(&obj->refcount); |
325 | } |
326 | |
327 | /** |
328 | * __drm_gem_object_put - raw function to release a GEM buffer object reference |
329 | * @obj: GEM buffer object |
330 | * |
331 | * This function is meant to be used by drivers which are not encumbered with |
332 | * &drm_device.struct_mutex legacy locking and which are using the |
333 | * gem_free_object_unlocked callback. It avoids all the locking checks and |
334 | * locking overhead of drm_gem_object_put() and drm_gem_object_put_unlocked(). |
335 | * |
336 | * Drivers should never call this directly in their code. Instead they should |
337 | * wrap it up into a ``driver_gem_object_put(struct driver_gem_object *obj)`` |
338 | * wrapper function, and use that. Shared code should never call this, to |
339 | * avoid breaking drivers by accident which still depend upon |
340 | * &drm_device.struct_mutex locking. |
341 | */ |
342 | static inline void |
343 | __drm_gem_object_put(struct drm_gem_object *obj) |
344 | { |
345 | kref_put(&obj->refcount, drm_gem_object_free); |
346 | } |
347 | |
348 | void drm_gem_object_put_unlocked(struct drm_gem_object *obj); |
349 | void drm_gem_object_put(struct drm_gem_object *obj); |
350 | |
351 | int drm_gem_handle_create(struct drm_file *file_priv, |
352 | struct drm_gem_object *obj, |
353 | u32 *handlep); |
354 | int drm_gem_handle_delete(struct drm_file *filp, u32 handle); |
355 | |
356 | |
357 | void drm_gem_free_mmap_offset(struct drm_gem_object *obj); |
358 | int drm_gem_create_mmap_offset(struct drm_gem_object *obj); |
359 | int drm_gem_create_mmap_offset_size(struct drm_gem_object *obj, size_t size); |
360 | |
361 | struct page **drm_gem_get_pages(struct drm_gem_object *obj); |
362 | void drm_gem_put_pages(struct drm_gem_object *obj, struct page **pages, |
363 | bool dirty, bool accessed); |
364 | |
365 | struct drm_gem_object *drm_gem_object_lookup(struct drm_file *filp, u32 handle); |
366 | int drm_gem_dumb_map_offset(struct drm_file *file, struct drm_device *dev, |
367 | u32 handle, u64 *offset); |
368 | int drm_gem_dumb_destroy(struct drm_file *file, |
369 | struct drm_device *dev, |
370 | uint32_t handle); |
371 | |
372 | int drm_gem_pin(struct drm_gem_object *obj); |
373 | void drm_gem_unpin(struct drm_gem_object *obj); |
374 | void *drm_gem_vmap(struct drm_gem_object *obj); |
375 | void drm_gem_vunmap(struct drm_gem_object *obj, void *vaddr); |
376 | |
377 | #endif /* __DRM_GEM_H__ */ |
378 | |