source: src/linux/universal/linux-4.4/include/drm/ttm/ttm_object.h @ 31859

Last change on this file since 31859 was 31859, checked in by brainslayer, 4 months ago

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1/**************************************************************************
2 *
3 * Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA
4 * All Rights Reserved.
5 *
6 * Permission is hereby granted, free of charge, to any person obtaining a
7 * copy of this software and associated documentation files (the
8 * "Software"), to deal in the Software without restriction, including
9 * without limitation the rights to use, copy, modify, merge, publish,
10 * distribute, sub license, and/or sell copies of the Software, and to
11 * permit persons to whom the Software is furnished to do so, subject to
12 * the following conditions:
13 *
14 * The above copyright notice and this permission notice (including the
15 * next paragraph) shall be included in all copies or substantial portions
16 * of the Software.
17 *
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
19 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
20 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
21 * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
22 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
23 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
24 * USE OR OTHER DEALINGS IN THE SOFTWARE.
25 *
26 **************************************************************************/
27/*
28 * Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com>
29 */
30/** @file ttm_object.h
31 *
32 * Base- and reference object implementation for the various
33 * ttm objects. Implements reference counting, minimal security checks
34 * and release on file close.
35 */
36
37#ifndef _TTM_OBJECT_H_
38#define _TTM_OBJECT_H_
39
40#include <linux/list.h>
41#include <drm/drm_hashtab.h>
42#include <linux/kref.h>
43#include <linux/rcupdate.h>
44#include <linux/dma-buf.h>
45#include <ttm/ttm_memory.h>
46
47/**
48 * enum ttm_ref_type
49 *
50 * Describes what type of reference a ref object holds.
51 *
52 * TTM_REF_USAGE is a simple refcount on a base object.
53 *
54 * TTM_REF_SYNCCPU_READ is a SYNCCPU_READ reference on a
55 * buffer object.
56 *
57 * TTM_REF_SYNCCPU_WRITE is a SYNCCPU_WRITE reference on a
58 * buffer object.
59 *
60 */
61
62enum ttm_ref_type {
63        TTM_REF_USAGE,
64        TTM_REF_SYNCCPU_READ,
65        TTM_REF_SYNCCPU_WRITE,
66        TTM_REF_NUM
67};
68
69/**
70 * enum ttm_object_type
71 *
72 * One entry per ttm object type.
73 * Device-specific types should use the
74 * ttm_driver_typex types.
75 */
76
77enum ttm_object_type {
78        ttm_fence_type,
79        ttm_buffer_type,
80        ttm_lock_type,
81        ttm_prime_type,
82        ttm_driver_type0 = 256,
83        ttm_driver_type1,
84        ttm_driver_type2,
85        ttm_driver_type3,
86        ttm_driver_type4,
87        ttm_driver_type5
88};
89
90struct ttm_object_file;
91struct ttm_object_device;
92
93/**
94 * struct ttm_base_object
95 *
96 * @hash: hash entry for the per-device object hash.
97 * @type: derived type this object is base class for.
98 * @shareable: Other ttm_object_files can access this object.
99 *
100 * @tfile: Pointer to ttm_object_file of the creator.
101 * NULL if the object was not created by a user request.
102 * (kernel object).
103 *
104 * @refcount: Number of references to this object, not
105 * including the hash entry. A reference to a base object can
106 * only be held by a ref object.
107 *
108 * @refcount_release: A function to be called when there are
109 * no more references to this object. This function should
110 * destroy the object (or make sure destruction eventually happens),
111 * and when it is called, the object has
112 * already been taken out of the per-device hash. The parameter
113 * "base" should be set to NULL by the function.
114 *
115 * @ref_obj_release: A function to be called when a reference object
116 * with another ttm_ref_type than TTM_REF_USAGE is deleted.
117 * This function may, for example, release a lock held by a user-space
118 * process.
119 *
120 * This struct is intended to be used as a base struct for objects that
121 * are visible to user-space. It provides a global name, race-safe
122 * access and refcounting, minimal access contol and hooks for unref actions.
123 */
124
125struct ttm_base_object {
126        struct rcu_head rhead;
127        struct drm_hash_item hash;
128        enum ttm_object_type object_type;
129        bool shareable;
130        struct ttm_object_file *tfile;
131        struct kref refcount;
132        void (*refcount_release) (struct ttm_base_object **base);
133        void (*ref_obj_release) (struct ttm_base_object *base,
134                                 enum ttm_ref_type ref_type);
135};
136
137
138/**
139 * struct ttm_prime_object - Modified base object that is prime-aware
140 *
141 * @base: struct ttm_base_object that we derive from
142 * @mutex: Mutex protecting the @dma_buf member.
143 * @size: Size of the dma_buf associated with this object
144 * @real_type: Type of the underlying object. Needed since we're setting
145 * the value of @base::object_type to ttm_prime_type
146 * @dma_buf: Non ref-coutned pointer to a struct dma_buf created from this
147 * object.
148 * @refcount_release: The underlying object's release method. Needed since
149 * we set @base::refcount_release to our own release method.
150 */
151
152struct ttm_prime_object {
153        struct ttm_base_object base;
154        struct mutex mutex;
155        size_t size;
156        enum ttm_object_type real_type;
157        struct dma_buf *dma_buf;
158        void (*refcount_release) (struct ttm_base_object **);
159};
160
161/**
162 * ttm_base_object_init
163 *
164 * @tfile: Pointer to a struct ttm_object_file.
165 * @base: The struct ttm_base_object to initialize.
166 * @shareable: This object is shareable with other applcations.
167 * (different @tfile pointers.)
168 * @type: The object type.
169 * @refcount_release: See the struct ttm_base_object description.
170 * @ref_obj_release: See the struct ttm_base_object description.
171 *
172 * Initializes a struct ttm_base_object.
173 */
174
175extern int ttm_base_object_init(struct ttm_object_file *tfile,
176                                struct ttm_base_object *base,
177                                bool shareable,
178                                enum ttm_object_type type,
179                                void (*refcount_release) (struct ttm_base_object
180                                                          **),
181                                void (*ref_obj_release) (struct ttm_base_object
182                                                         *,
183                                                         enum ttm_ref_type
184                                                         ref_type));
185
186/**
187 * ttm_base_object_lookup
188 *
189 * @tfile: Pointer to a struct ttm_object_file.
190 * @key: Hash key
191 *
192 * Looks up a struct ttm_base_object with the key @key.
193 */
194
195extern struct ttm_base_object *ttm_base_object_lookup(struct ttm_object_file
196                                                      *tfile, uint32_t key);
197
198/**
199 * ttm_base_object_lookup_for_ref
200 *
201 * @tdev: Pointer to a struct ttm_object_device.
202 * @key: Hash key
203 *
204 * Looks up a struct ttm_base_object with the key @key.
205 * This function should only be used when the struct tfile associated with the
206 * caller doesn't yet have a reference to the base object.
207 */
208
209extern struct ttm_base_object *
210ttm_base_object_lookup_for_ref(struct ttm_object_device *tdev, uint32_t key);
211
212/**
213 * ttm_base_object_unref
214 *
215 * @p_base: Pointer to a pointer referencing a struct ttm_base_object.
216 *
217 * Decrements the base object refcount and clears the pointer pointed to by
218 * p_base.
219 */
220
221extern void ttm_base_object_unref(struct ttm_base_object **p_base);
222
223/**
224 * ttm_ref_object_add.
225 *
226 * @tfile: A struct ttm_object_file representing the application owning the
227 * ref_object.
228 * @base: The base object to reference.
229 * @ref_type: The type of reference.
230 * @existed: Upon completion, indicates that an identical reference object
231 * already existed, and the refcount was upped on that object instead.
232 * @require_existed: Fail with -EPERM if an identical ref object didn't
233 * already exist.
234 *
235 * Checks that the base object is shareable and adds a ref object to it.
236 *
237 * Adding a ref object to a base object is basically like referencing the
238 * base object, but a user-space application holds the reference. When the
239 * file corresponding to @tfile is closed, all its reference objects are
240 * deleted. A reference object can have different types depending on what
241 * it's intended for. It can be refcounting to prevent object destruction,
242 * When user-space takes a lock, it can add a ref object to that lock to
243 * make sure the lock is released if the application dies. A ref object
244 * will hold a single reference on a base object.
245 */
246extern int ttm_ref_object_add(struct ttm_object_file *tfile,
247                              struct ttm_base_object *base,
248                              enum ttm_ref_type ref_type, bool *existed,
249                              bool require_existed);
250
251extern bool ttm_ref_object_exists(struct ttm_object_file *tfile,
252                                  struct ttm_base_object *base);
253
254/**
255 * ttm_ref_object_base_unref
256 *
257 * @key: Key representing the base object.
258 * @ref_type: Ref type of the ref object to be dereferenced.
259 *
260 * Unreference a ref object with type @ref_type
261 * on the base object identified by @key. If there are no duplicate
262 * references, the ref object will be destroyed and the base object
263 * will be unreferenced.
264 */
265extern int ttm_ref_object_base_unref(struct ttm_object_file *tfile,
266                                     unsigned long key,
267                                     enum ttm_ref_type ref_type);
268
269/**
270 * ttm_object_file_init - initialize a struct ttm_object file
271 *
272 * @tdev: A struct ttm_object device this file is initialized on.
273 * @hash_order: Order of the hash table used to hold the reference objects.
274 *
275 * This is typically called by the file_ops::open function.
276 */
277
278extern struct ttm_object_file *ttm_object_file_init(struct ttm_object_device
279                                                    *tdev,
280                                                    unsigned int hash_order);
281
282/**
283 * ttm_object_file_release - release data held by a ttm_object_file
284 *
285 * @p_tfile: Pointer to pointer to the ttm_object_file object to release.
286 * *p_tfile will be set to NULL by this function.
287 *
288 * Releases all data associated by a ttm_object_file.
289 * Typically called from file_ops::release. The caller must
290 * ensure that there are no concurrent users of tfile.
291 */
292
293extern void ttm_object_file_release(struct ttm_object_file **p_tfile);
294
295/**
296 * ttm_object device init - initialize a struct ttm_object_device
297 *
298 * @mem_glob: struct ttm_mem_global for memory accounting.
299 * @hash_order: Order of hash table used to hash the base objects.
300 * @ops: DMA buf ops for prime objects of this device.
301 *
302 * This function is typically called on device initialization to prepare
303 * data structures needed for ttm base and ref objects.
304 */
305
306extern struct ttm_object_device *
307ttm_object_device_init(struct ttm_mem_global *mem_glob,
308                       unsigned int hash_order,
309                       const struct dma_buf_ops *ops);
310
311/**
312 * ttm_object_device_release - release data held by a ttm_object_device
313 *
314 * @p_tdev: Pointer to pointer to the ttm_object_device object to release.
315 * *p_tdev will be set to NULL by this function.
316 *
317 * Releases all data associated by a ttm_object_device.
318 * Typically called from driver::unload before the destruction of the
319 * device private data structure.
320 */
321
322extern void ttm_object_device_release(struct ttm_object_device **p_tdev);
323
324#define ttm_base_object_kfree(__object, __base)\
325        kfree_rcu(__object, __base.rhead)
326
327extern int ttm_prime_object_init(struct ttm_object_file *tfile,
328                                 size_t size,
329                                 struct ttm_prime_object *prime,
330                                 bool shareable,
331                                 enum ttm_object_type type,
332                                 void (*refcount_release)
333                                 (struct ttm_base_object **),
334                                 void (*ref_obj_release)
335                                 (struct ttm_base_object *,
336                                  enum ttm_ref_type ref_type));
337
338static inline enum ttm_object_type
339ttm_base_object_type(struct ttm_base_object *base)
340{
341        return (base->object_type == ttm_prime_type) ?
342                container_of(base, struct ttm_prime_object, base)->real_type :
343                base->object_type;
344}
345extern int ttm_prime_fd_to_handle(struct ttm_object_file *tfile,
346                                  int fd, u32 *handle);
347extern int ttm_prime_handle_to_fd(struct ttm_object_file *tfile,
348                                  uint32_t handle, uint32_t flags,
349                                  int *prime_fd);
350
351#define ttm_prime_object_kfree(__obj, __prime)          \
352        kfree_rcu(__obj, __prime.base.rhead)
353#endif
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