aboutsummaryrefslogtreecommitdiffstats
path: root/src/util/disk_cache.h
blob: 29fb37cea1100f1111fd706cf243288e0f286759 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
/*
 * Copyright © 2014 Intel Corporation
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice (including the next
 * paragraph) shall be included in all copies or substantial portions of the
 * Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
 * IN THE SOFTWARE.
 */

#ifndef DISK_CACHE_H
#define DISK_CACHE_H

#ifdef HAVE_DLFCN_H
#include <dlfcn.h>
#include <stdio.h>
#include "util/build_id.h"
#endif
#include <assert.h>
#include <stdint.h>
#include <stdbool.h>
#include <sys/stat.h>
#include "util/mesa-sha1.h"

#ifdef __cplusplus
extern "C" {
#endif

/* Size of cache keys in bytes. */
#define CACHE_KEY_SIZE 20

#define CACHE_DIR_NAME "mesa_shader_cache"

typedef uint8_t cache_key[CACHE_KEY_SIZE];

/* WARNING: 3rd party applications might be reading the cache item metadata.
 * Do not change these values without making the change widely known.
 * Please contact Valve developers and make them aware of this change.
 */
#define CACHE_ITEM_TYPE_UNKNOWN  0x0
#define CACHE_ITEM_TYPE_GLSL     0x1

typedef void
(*disk_cache_put_cb) (const void *key, signed long keySize,
                      const void *value, signed long valueSize);

typedef signed long
(*disk_cache_get_cb) (const void *key, signed long keySize,
                      void *value, signed long valueSize);

struct cache_item_metadata {
   /**
    * The cache item type. This could be used to identify a GLSL cache item,
    * a certain type of IR (tgsi, nir, etc), or signal that it is the final
    * binary form of the shader.
    */
   uint32_t type;

   /** GLSL cache item metadata */
   cache_key *keys;   /* sha1 list of shaders that make up the cache item */
   uint32_t num_keys;
};

struct disk_cache;

static inline char *
disk_cache_format_hex_id(char *buf, const uint8_t *hex_id, unsigned size)
{
   static const char hex_digits[] = "0123456789abcdef";
   unsigned i;

   for (i = 0; i < size; i += 2) {
      buf[i] = hex_digits[hex_id[i >> 1] >> 4];
      buf[i + 1] = hex_digits[hex_id[i >> 1] & 0x0f];
   }
   buf[i] = '\0';

   return buf;
}

#ifdef HAVE_DLADDR
static inline bool
disk_cache_get_function_timestamp(void *ptr, uint32_t* timestamp)
{
   Dl_info info;
   struct stat st;
   if (!dladdr(ptr, &info) || !info.dli_fname) {
      return false;
   }
   if (stat(info.dli_fname, &st)) {
      return false;
   }

   if (!st.st_mtime) {
      fprintf(stderr, "Mesa: The provided filesystem timestamp for the cache "
              "is bogus! Disabling On-disk cache.\n");
      return false;
   }

   *timestamp = st.st_mtime;

   return true;
}

static inline bool
disk_cache_get_function_identifier(void *ptr, struct mesa_sha1 *ctx)
{
   uint32_t timestamp;

#ifdef HAVE_DL_ITERATE_PHDR
   const struct build_id_note *note = NULL;
   if ((note = build_id_find_nhdr_for_addr(ptr))) {
      _mesa_sha1_update(ctx, build_id_data(note), build_id_length(note));
   } else
#endif
   if (disk_cache_get_function_timestamp(ptr, &timestamp)) {
      _mesa_sha1_update(ctx, &timestamp, sizeof(timestamp));
   } else
      return false;
   return true;
}
#else
static inline bool
disk_cache_get_function_identifier(void *ptr, struct mesa_sha1 *ctx)
{
   return false;
}
#endif

/* Provide inlined stub functions if the shader cache is disabled. */

#ifdef ENABLE_SHADER_CACHE

/**
 * Create a new cache object.
 *
 * This function creates the handle necessary for all subsequent cache_*
 * functions.
 *
 * This cache provides two distinct operations:
 *
 *   o Storage and retrieval of arbitrary objects by cryptographic
 *     name (or "key").  This is provided via disk_cache_put() and
 *     disk_cache_get().
 *
 *   o The ability to store a key alone and check later whether the
 *     key was previously stored. This is provided via disk_cache_put_key()
 *     and disk_cache_has_key().
 *
 * The put_key()/has_key() operations are conceptually identical to
 * put()/get() with no data, but are provided separately to allow for
 * a more efficient implementation.
 *
 * In all cases, the keys are sequences of 20 bytes. It is anticipated
 * that callers will compute appropriate SHA-1 signatures for keys,
 * (though nothing in this implementation directly relies on how the
 * names are computed). See mesa-sha1.h and _mesa_sha1_compute for
 * assistance in computing SHA-1 signatures.
 */
struct disk_cache *
disk_cache_create(const char *gpu_name, const char *timestamp,
                  uint64_t driver_flags);

/**
 * Destroy a cache object, (freeing all associated resources).
 */
void
disk_cache_destroy(struct disk_cache *cache);

/* Wait for all previous disk_cache_put() calls to be processed (used for unit
 * testing).
 */
void
disk_cache_wait_for_idle(struct disk_cache *cache);

/**
 * Remove the item in the cache under the name \key.
 */
void
disk_cache_remove(struct disk_cache *cache, const cache_key key);

/**
 * Store an item in the cache under the name \key.
 *
 * The item can be retrieved later with disk_cache_get(), (unless the item has
 * been evicted in the interim).
 *
 * Any call to disk_cache_put() may cause an existing, random item to be
 * evicted from the cache.
 */
void
disk_cache_put(struct disk_cache *cache, const cache_key key,
               const void *data, size_t size,
               struct cache_item_metadata *cache_item_metadata);

/**
 * Retrieve an item previously stored in the cache with the name <key>.
 *
 * The item must have been previously stored with a call to disk_cache_put().
 *
 * If \size is non-NULL, then, on successful return, it will be set to the
 * size of the object.
 *
 * \return A pointer to the stored object if found. NULL if the object
 * is not found, or if any error occurs, (memory allocation failure,
 * filesystem error, etc.). The returned data is malloc'ed so the
 * caller should call free() it when finished.
 */
void *
disk_cache_get(struct disk_cache *cache, const cache_key key, size_t *size);

/**
 * Store the name \key within the cache, (without any associated data).
 *
 * Later this key can be checked with disk_cache_has_key(), (unless the key
 * has been evicted in the interim).
 *
 * Any call to disk_cache_put_key() may cause an existing, random key to be
 * evicted from the cache.
 */
void
disk_cache_put_key(struct disk_cache *cache, const cache_key key);

/**
 * Test whether the name \key was previously recorded in the cache.
 *
 * Return value: True if disk_cache_put_key() was previously called with
 * \key, (and the key was not evicted in the interim).
 *
 * Note: disk_cache_has_key() will only return true for keys passed to
 * disk_cache_put_key(). Specifically, a call to disk_cache_put() will not cause
 * disk_cache_has_key() to return true for the same key.
 */
bool
disk_cache_has_key(struct disk_cache *cache, const cache_key key);

/**
 * Compute the name \key from \data of given \size.
 */
void
disk_cache_compute_key(struct disk_cache *cache, const void *data, size_t size,
                       cache_key key);

void
disk_cache_set_callbacks(struct disk_cache *cache, disk_cache_put_cb put,
                         disk_cache_get_cb get);

#else

static inline struct disk_cache *
disk_cache_create(const char *gpu_name, const char *timestamp,
                  uint64_t driver_flags)
{
   return NULL;
}

static inline void
disk_cache_destroy(struct disk_cache *cache) {
   return;
}

static inline void
disk_cache_put(struct disk_cache *cache, const cache_key key,
               const void *data, size_t size,
               struct cache_item_metadata *cache_item_metadata)
{
   return;
}

static inline void
disk_cache_remove(struct disk_cache *cache, const cache_key key)
{
   return;
}

static inline uint8_t *
disk_cache_get(struct disk_cache *cache, const cache_key key, size_t *size)
{
   return NULL;
}

static inline void
disk_cache_put_key(struct disk_cache *cache, const cache_key key)
{
   return;
}

static inline bool
disk_cache_has_key(struct disk_cache *cache, const cache_key key)
{
   return false;
}

static inline void
disk_cache_compute_key(struct disk_cache *cache, const void *data, size_t size,
                       const cache_key key)
{
   return;
}

static inline void
disk_cache_set_callbacks(struct disk_cache *cache, disk_cache_put_cb put,
                         disk_cache_get_cb get)
{
   return;
}

#endif /* ENABLE_SHADER_CACHE */

#ifdef __cplusplus
}
#endif

#endif /* CACHE_H */