1 /**************************************************************************
2 *
3 * Copyright 2007-2008 VMware, Inc.
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
19 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
20 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
21 * IN NO EVENT SHALL VMWARE AND/OR ITS SUPPLIERS BE LIABLE FOR
22 * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
23 * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
24 * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
25 *
26 **************************************************************************/
27
28 /**
29 * \file
30 * Buffer cache.
31 *
32 * \author Jose Fonseca <jfonseca-at-vmware-dot-com>
33 * \author Thomas Hellström <thellstrom-at-vmware-dot-com>
34 */
35
36
37 #include "pipe/p_compiler.h"
38 #include "util/u_debug.h"
39 #include "os/os_thread.h"
40 #include "util/u_memory.h"
41 #include "util/list.h"
42
43 #include "pb_buffer.h"
44 #include "pb_bufmgr.h"
45 #include "pb_cache.h"
46
47
48 /**
49 * Wrapper around a pipe buffer which adds delayed destruction.
50 */
51 struct pb_cache_buffer
52 {
53 struct pb_buffer base;
54 struct pb_buffer *buffer;
55 struct pb_cache_manager *mgr;
56 struct pb_cache_entry cache_entry;
57 };
58
59
60 struct pb_cache_manager
61 {
62 struct pb_manager base;
63 struct pb_manager *provider;
64 struct pb_cache cache;
65 };
66
67
68 static inline struct pb_cache_buffer *
pb_cache_buffer(struct pb_buffer * buf)69 pb_cache_buffer(struct pb_buffer *buf)
70 {
71 assert(buf);
72 return (struct pb_cache_buffer *)buf;
73 }
74
75
76 static inline struct pb_cache_manager *
pb_cache_manager(struct pb_manager * mgr)77 pb_cache_manager(struct pb_manager *mgr)
78 {
79 assert(mgr);
80 return (struct pb_cache_manager *)mgr;
81 }
82
83
84 void
pb_cache_manager_remove_buffer(struct pb_buffer * pb_buf)85 pb_cache_manager_remove_buffer(struct pb_buffer *pb_buf)
86 {
87 struct pb_cache_buffer *buf = pb_cache_buffer(pb_buf);
88
89 /* the buffer won't be added if mgr is NULL */
90 buf->mgr = NULL;
91 }
92
93 /**
94 * Actually destroy the buffer.
95 */
96 static void
_pb_cache_buffer_destroy(struct pb_buffer * pb_buf)97 _pb_cache_buffer_destroy(struct pb_buffer *pb_buf)
98 {
99 struct pb_cache_buffer *buf = pb_cache_buffer(pb_buf);
100
101 assert(!pipe_is_referenced(&buf->base.reference));
102 pb_reference(&buf->buffer, NULL);
103 FREE(buf);
104 }
105
106
107 static void
pb_cache_buffer_destroy(struct pb_buffer * _buf)108 pb_cache_buffer_destroy(struct pb_buffer *_buf)
109 {
110 struct pb_cache_buffer *buf = pb_cache_buffer(_buf);
111 struct pb_cache_manager *mgr = buf->mgr;
112
113 if (!mgr) {
114 pb_reference(&buf->buffer, NULL);
115 FREE(buf);
116 return;
117 }
118
119 pb_cache_add_buffer(&buf->cache_entry);
120 }
121
122
123 static void *
pb_cache_buffer_map(struct pb_buffer * _buf,unsigned flags,void * flush_ctx)124 pb_cache_buffer_map(struct pb_buffer *_buf,
125 unsigned flags, void *flush_ctx)
126 {
127 struct pb_cache_buffer *buf = pb_cache_buffer(_buf);
128 return pb_map(buf->buffer, flags, flush_ctx);
129 }
130
131
132 static void
pb_cache_buffer_unmap(struct pb_buffer * _buf)133 pb_cache_buffer_unmap(struct pb_buffer *_buf)
134 {
135 struct pb_cache_buffer *buf = pb_cache_buffer(_buf);
136 pb_unmap(buf->buffer);
137 }
138
139
140 static enum pipe_error
pb_cache_buffer_validate(struct pb_buffer * _buf,struct pb_validate * vl,unsigned flags)141 pb_cache_buffer_validate(struct pb_buffer *_buf,
142 struct pb_validate *vl,
143 unsigned flags)
144 {
145 struct pb_cache_buffer *buf = pb_cache_buffer(_buf);
146 return pb_validate(buf->buffer, vl, flags);
147 }
148
149
150 static void
pb_cache_buffer_fence(struct pb_buffer * _buf,struct pipe_fence_handle * fence)151 pb_cache_buffer_fence(struct pb_buffer *_buf,
152 struct pipe_fence_handle *fence)
153 {
154 struct pb_cache_buffer *buf = pb_cache_buffer(_buf);
155 pb_fence(buf->buffer, fence);
156 }
157
158
159 static void
pb_cache_buffer_get_base_buffer(struct pb_buffer * _buf,struct pb_buffer ** base_buf,pb_size * offset)160 pb_cache_buffer_get_base_buffer(struct pb_buffer *_buf,
161 struct pb_buffer **base_buf,
162 pb_size *offset)
163 {
164 struct pb_cache_buffer *buf = pb_cache_buffer(_buf);
165 pb_get_base_buffer(buf->buffer, base_buf, offset);
166 }
167
168
169 const struct pb_vtbl
170 pb_cache_buffer_vtbl = {
171 pb_cache_buffer_destroy,
172 pb_cache_buffer_map,
173 pb_cache_buffer_unmap,
174 pb_cache_buffer_validate,
175 pb_cache_buffer_fence,
176 pb_cache_buffer_get_base_buffer
177 };
178
179
180 static bool
pb_cache_can_reclaim_buffer(struct pb_buffer * _buf)181 pb_cache_can_reclaim_buffer(struct pb_buffer *_buf)
182 {
183 struct pb_cache_buffer *buf = pb_cache_buffer(_buf);
184
185 if (buf->mgr->provider->is_buffer_busy) {
186 if (buf->mgr->provider->is_buffer_busy(buf->mgr->provider, buf->buffer))
187 return false;
188 } else {
189 void *ptr = pb_map(buf->buffer, PB_USAGE_DONTBLOCK, NULL);
190
191 if (!ptr)
192 return false;
193
194 pb_unmap(buf->buffer);
195 }
196
197 return true;
198 }
199
200
201 static struct pb_buffer *
pb_cache_manager_create_buffer(struct pb_manager * _mgr,pb_size size,const struct pb_desc * desc)202 pb_cache_manager_create_buffer(struct pb_manager *_mgr,
203 pb_size size,
204 const struct pb_desc *desc)
205 {
206 struct pb_cache_manager *mgr = pb_cache_manager(_mgr);
207 struct pb_cache_buffer *buf;
208
209 /* get a buffer from the cache */
210 buf = (struct pb_cache_buffer *)
211 pb_cache_reclaim_buffer(&mgr->cache, size, desc->alignment,
212 desc->usage, 0);
213 if (buf)
214 return &buf->base;
215
216 /* create a new one */
217 buf = CALLOC_STRUCT(pb_cache_buffer);
218 if (!buf)
219 return NULL;
220
221 buf->buffer = mgr->provider->create_buffer(mgr->provider, size, desc);
222
223 /* Empty the cache and try again. */
224 if (!buf->buffer) {
225 pb_cache_release_all_buffers(&mgr->cache);
226 buf->buffer = mgr->provider->create_buffer(mgr->provider, size, desc);
227 }
228
229 if(!buf->buffer) {
230 FREE(buf);
231 return NULL;
232 }
233
234 assert(pipe_is_referenced(&buf->buffer->reference));
235 assert(pb_check_alignment(desc->alignment, buf->buffer->alignment));
236 assert(buf->buffer->size >= size);
237
238 pipe_reference_init(&buf->base.reference, 1);
239 buf->base.alignment = buf->buffer->alignment;
240 buf->base.usage = buf->buffer->usage;
241 buf->base.size = buf->buffer->size;
242
243 buf->base.vtbl = &pb_cache_buffer_vtbl;
244 buf->mgr = mgr;
245 pb_cache_init_entry(&mgr->cache, &buf->cache_entry, &buf->base, 0);
246
247 return &buf->base;
248 }
249
250
251 static void
pb_cache_manager_flush(struct pb_manager * _mgr)252 pb_cache_manager_flush(struct pb_manager *_mgr)
253 {
254 struct pb_cache_manager *mgr = pb_cache_manager(_mgr);
255
256 pb_cache_release_all_buffers(&mgr->cache);
257
258 assert(mgr->provider->flush);
259 if(mgr->provider->flush)
260 mgr->provider->flush(mgr->provider);
261 }
262
263
264 static void
pb_cache_manager_destroy(struct pb_manager * _mgr)265 pb_cache_manager_destroy(struct pb_manager *_mgr)
266 {
267 struct pb_cache_manager *mgr = pb_cache_manager(_mgr);
268
269 pb_cache_deinit(&mgr->cache);
270 FREE(mgr);
271 }
272
273 /**
274 * Create a caching buffer manager
275 *
276 * @param provider The buffer manager to which cache miss buffer requests
277 * should be redirected.
278 * @param usecs Unused buffers may be released from the cache after this
279 * time
280 * @param size_factor Declare buffers that are size_factor times bigger than
281 * the requested size as cache hits.
282 * @param bypass_usage Bitmask. If (requested usage & bypass_usage) != 0,
283 * buffer allocation requests are redirected to the provider.
284 * @param maximum_cache_size Maximum size of all unused buffers the cache can
285 * hold.
286 */
287 struct pb_manager *
pb_cache_manager_create(struct pb_manager * provider,unsigned usecs,float size_factor,unsigned bypass_usage,uint64_t maximum_cache_size)288 pb_cache_manager_create(struct pb_manager *provider,
289 unsigned usecs,
290 float size_factor,
291 unsigned bypass_usage,
292 uint64_t maximum_cache_size)
293 {
294 struct pb_cache_manager *mgr;
295
296 if (!provider)
297 return NULL;
298
299 mgr = CALLOC_STRUCT(pb_cache_manager);
300 if (!mgr)
301 return NULL;
302
303 mgr->base.destroy = pb_cache_manager_destroy;
304 mgr->base.create_buffer = pb_cache_manager_create_buffer;
305 mgr->base.flush = pb_cache_manager_flush;
306 mgr->provider = provider;
307 pb_cache_init(&mgr->cache, usecs, size_factor, bypass_usage,
308 maximum_cache_size,
309 _pb_cache_buffer_destroy,
310 pb_cache_can_reclaim_buffer);
311 return &mgr->base;
312 }
313