src/util/disk_cache.h

   1 /*
   2  * Copyright © 2014 Intel Corporation
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice (including the next
  12  * paragraph) shall be included in all copies or substantial portions of the
  13  * Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  21  * IN THE SOFTWARE.
  22  */
  23
  24 #ifndef DISK_CACHE_H
  25 #define DISK_CACHE_H
  26
  27 #ifdef HAVE_DLFCN_H
  28 #include <dlfcn.h>
  29 #endif
  30 #include <assert.h>
  31 #include <stdint.h>
  32 #include <stdbool.h>
  33 #include <sys/stat.h>
  34
  35 #ifdef __cplusplus
  36 extern "C" {
  37 #endif
  38
  39 /* Size of cache keys in bytes. */
  40 #define CACHE_KEY_SIZE 20
  41
  42 #define CACHE_DIR_NAME "mesa_shader_cache"
  43
  44 typedef uint8_t cache_key[CACHE_KEY_SIZE];
  45
  46 /* WARNING: 3rd party applications might be reading the cache item metadata.
  47  * Do not change these values without making the change widely known.
  48  * Please contact Valve developers and make them aware of this change.
  49  */
  50 #define CACHE_ITEM_TYPE_UNKNOWN  0x0
  51 #define CACHE_ITEM_TYPE_GLSL     0x1
  52
  53 typedef void
  54 (*disk_cache_put_cb) (const void *key, signed long keySize,
  55                       const void *value, signed long valueSize);
  56
  57 typedef signed long
  58 (*disk_cache_get_cb) (const void *key, signed long keySize,
  59                       void *value, signed long valueSize);
  60
  61 struct cache_item_metadata {
  62    /**
  63     * The cache item type. This could be used to identify a GLSL cache item,
  64     * a certain type of IR (tgsi, nir, etc), or signal that it is the final
  65     * binary form of the shader.
  66     */
  67    uint32_t type;
  68
  69    /** GLSL cache item metadata */
  70    cache_key *keys;   /* sha1 list of shaders that make up the cache item */
  71    uint32_t num_keys;
  72 };
  73
  74 struct disk_cache;
  75
  76 static inline char *
  77 disk_cache_format_hex_id(char *buf, const uint8_t *hex_id, unsigned size)
  78 {
  79    static const char hex_digits[] = "0123456789abcdef";
  80    unsigned i;
  81
  82    for (i = 0; i < size; i += 2) {
  83       buf[i] = hex_digits[hex_id[i >> 1] >> 4];
  84       buf[i + 1] = hex_digits[hex_id[i >> 1] & 0x0f];
  85    }
  86    buf[i] = '\0';
  87
  88    return buf;
  89 }
  90
  91 #ifdef HAVE_DLFCN_H
  92 static inline bool
  93 disk_cache_get_function_timestamp(void *ptr, uint32_t* timestamp)
  94 {
  95    Dl_info info;
  96    struct stat st;
  97    if (!dladdr(ptr, &info) || !info.dli_fname) {
  98       return false;
  99    }
 100    if (stat(info.dli_fname, &st)) {
 101       return false;
 102    }
 103    *timestamp = st.st_mtime;
 104    return true;
 105 }
 106 #endif
 107
 108 /* Provide inlined stub functions if the shader cache is disabled. */
 109
 110 #ifdef ENABLE_SHADER_CACHE
 111
 112 /**
 113  * Create a new cache object.
 114  *
 115  * This function creates the handle necessary for all subsequent cache_*
 116  * functions.
 117  *
 118  * This cache provides two distinct operations:
 119  *
 120  *   o Storage and retrieval of arbitrary objects by cryptographic
 121  *     name (or "key").  This is provided via disk_cache_put() and
 122  *     disk_cache_get().
 123  *
 124  *   o The ability to store a key alone and check later whether the
 125  *     key was previously stored. This is provided via disk_cache_put_key()
 126  *     and disk_cache_has_key().
 127  *
 128  * The put_key()/has_key() operations are conceptually identical to
 129  * put()/get() with no data, but are provided separately to allow for
 130  * a more efficient implementation.
 131  *
 132  * In all cases, the keys are sequences of 20 bytes. It is anticipated
 133  * that callers will compute appropriate SHA-1 signatures for keys,
 134  * (though nothing in this implementation directly relies on how the
 135  * names are computed). See mesa-sha1.h and _mesa_sha1_compute for
 136  * assistance in computing SHA-1 signatures.
 137  */
 138 struct disk_cache *
 139 disk_cache_create(const char *gpu_name, const char *timestamp,
 140                   uint64_t driver_flags);
 141
 142 /**
 143  * Destroy a cache object, (freeing all associated resources).
 144  */
 145 void
 146 disk_cache_destroy(struct disk_cache *cache);
 147
 148 /**
 149  * Remove the item in the cache under the name \key.
 150  */
 151 void
 152 disk_cache_remove(struct disk_cache *cache, const cache_key key);
 153
 154 /**
 155  * Store an item in the cache under the name \key.
 156  *
 157  * The item can be retrieved later with disk_cache_get(), (unless the item has
 158  * been evicted in the interim).
 159  *
 160  * Any call to disk_cache_put() may cause an existing, random item to be
 161  * evicted from the cache.
 162  */
 163 void
 164 disk_cache_put(struct disk_cache *cache, const cache_key key,
 165                const void *data, size_t size,
 166                struct cache_item_metadata *cache_item_metadata);
 167
 168 /**
 169  * Retrieve an item previously stored in the cache with the name <key>.
 170  *
 171  * The item must have been previously stored with a call to disk_cache_put().
 172  *
 173  * If \size is non-NULL, then, on successful return, it will be set to the
 174  * size of the object.
 175  *
 176  * \return A pointer to the stored object if found. NULL if the object
 177  * is not found, or if any error occurs, (memory allocation failure,
 178  * filesystem error, etc.). The returned data is malloc'ed so the
 179  * caller should call free() it when finished.
 180  */
 181 void *
 182 disk_cache_get(struct disk_cache *cache, const cache_key key, size_t *size);
 183
 184 /**
 185  * Store the name \key within the cache, (without any associated data).
 186  *
 187  * Later this key can be checked with disk_cache_has_key(), (unless the key
 188  * has been evicted in the interim).
 189  *
 190  * Any call to disk_cache_put_key() may cause an existing, random key to be
 191  * evicted from the cache.
 192  */
 193 void
 194 disk_cache_put_key(struct disk_cache *cache, const cache_key key);
 195
 196 /**
 197  * Test whether the name \key was previously recorded in the cache.
 198  *
 199  * Return value: True if disk_cache_put_key() was previously called with
 200  * \key, (and the key was not evicted in the interim).
 201  *
 202  * Note: disk_cache_has_key() will only return true for keys passed to
 203  * disk_cache_put_key(). Specifically, a call to disk_cache_put() will not cause
 204  * disk_cache_has_key() to return true for the same key.
 205  */
 206 bool
 207 disk_cache_has_key(struct disk_cache *cache, const cache_key key);
 208
 209 /**
 210  * Compute the name \key from \data of given \size.
 211  */
 212 void
 213 disk_cache_compute_key(struct disk_cache *cache, const void *data, size_t size,
 214                        cache_key key);
 215
 216 void
 217 disk_cache_set_callbacks(struct disk_cache *cache, disk_cache_put_cb put,
 218                          disk_cache_get_cb get);
 219
 220 #else
 221
 222 static inline struct disk_cache *
 223 disk_cache_create(const char *gpu_name, const char *timestamp,
 224                   uint64_t driver_flags)
 225 {
 226    return NULL;
 227 }
 228
 229 static inline void
 230 disk_cache_destroy(struct disk_cache *cache) {
 231    return;
 232 }
 233
 234 static inline void
 235 disk_cache_put(struct disk_cache *cache, const cache_key key,
 236                const void *data, size_t size,
 237                struct cache_item_metadata *cache_item_metadata)
 238 {
 239    return;
 240 }
 241
 242 static inline void
 243 disk_cache_remove(struct disk_cache *cache, const cache_key key)
 244 {
 245    return;
 246 }
 247
 248 static inline uint8_t *
 249 disk_cache_get(struct disk_cache *cache, const cache_key key, size_t *size)
 250 {
 251    return NULL;
 252 }
 253
 254 static inline void
 255 disk_cache_put_key(struct disk_cache *cache, const cache_key key)
 256 {
 257    return;
 258 }
 259
 260 static inline bool
 261 disk_cache_has_key(struct disk_cache *cache, const cache_key key)
 262 {
 263    return false;
 264 }
 265
 266 static inline void
 267 disk_cache_compute_key(struct disk_cache *cache, const void *data, size_t size,
 268                        const cache_key key)
 269 {
 270    return;
 271 }
 272
 273 static inline void
 274 disk_cache_set_callbacks(struct disk_cache *cache, disk_cache_put_cb put,
 275                          disk_cache_get_cb get)
 276 {
 277    return;
 278 }
 279
 280 #endif /* ENABLE_SHADER_CACHE */
 281
 282 #ifdef __cplusplus
 283 }
 284 #endif
 285
 286 #endif /* CACHE_H */