util/disk_cache: allow drivers to pass a directory structure

In order to avoid costly fallback recompiles when cache items are
created with an old version of Mesa or for a different gpu on the
same system we want to create directories that look like this:

./{TIMESTAMP}_{LLVM_TIMESTAMP}/{GPU_ID}

Note: The disk cache util will take a single timestamp string, it is
up to the backend to concatenate the llvm string with the mesa string
if applicable.

Reviewed-by: Nicolai Hähnle <nicolai.haehnle@amd.com>

src/compiler/glsl/tests/cache_test.c

@@ -126,7 +126,7 @@ test_disk_cache_create(void)
     * MESA_GLSL_CACHE_DISABLE set, that disk_cache_create returns NULL.
     */
    setenv("MESA_GLSL_CACHE_DISABLE", "1", 1);
-   cache = disk_cache_create();
+   cache = disk_cache_create("test", "make_check");
    expect_null(cache, "disk_cache_create with MESA_GLSL_CACHE_DISABLE set");
 
    unsetenv("MESA_GLSL_CACHE_DISABLE");
@@ -137,19 +137,19 @@ test_disk_cache_create(void)
    unsetenv("MESA_GLSL_CACHE_DIR");
    unsetenv("XDG_CACHE_HOME");
 
-   cache = disk_cache_create();
+   cache = disk_cache_create("test", "make_check");
    expect_non_null(cache, "disk_cache_create with no environment variables");
 
    disk_cache_destroy(cache);
 
    /* Test with XDG_CACHE_HOME set */
    setenv("XDG_CACHE_HOME", CACHE_TEST_TMP "/xdg-cache-home", 1);
-   cache = disk_cache_create();
+   cache = disk_cache_create("test", "make_check");
    expect_null(cache, "disk_cache_create with XDG_CACHE_HOME set with"
                "a non-existing parent directory");
 
    mkdir(CACHE_TEST_TMP, 0755);
-   cache = disk_cache_create();
+   cache = disk_cache_create("test", "make_check");
    expect_non_null(cache, "disk_cache_create with XDG_CACHE_HOME set");
 
    disk_cache_destroy(cache);
@@ -159,12 +159,12 @@ test_disk_cache_create(void)
    expect_equal(err, 0, "Removing " CACHE_TEST_TMP);
 
    setenv("MESA_GLSL_CACHE_DIR", CACHE_TEST_TMP "/mesa-glsl-cache-dir", 1);
-   cache = disk_cache_create();
+   cache = disk_cache_create("test", "make_check");
    expect_null(cache, "disk_cache_create with MESA_GLSL_CACHE_DIR set with"
                "a non-existing parent directory");
 
    mkdir(CACHE_TEST_TMP, 0755);
-   cache = disk_cache_create();
+   cache = disk_cache_create("test", "make_check");
    expect_non_null(cache, "disk_cache_create with MESA_GLSL_CACHE_DIR set");
 
    disk_cache_destroy(cache);
@@ -203,7 +203,7 @@ test_put_and_get(void)
    uint8_t one_KB_key[20], one_MB_key[20];
    int count;
 
-   cache = disk_cache_create();
+   cache = disk_cache_create("test", "make_check");
 
    _mesa_sha1_compute(blob, sizeof(blob), blob_key);
 
@@ -235,7 +235,7 @@ test_put_and_get(void)
    disk_cache_destroy(cache);
 
    setenv("MESA_GLSL_CACHE_MAX_SIZE", "1K", 1);
-   cache = disk_cache_create();
+   cache = disk_cache_create("test", "make_check");
 
    one_KB = calloc(1, 1024);
 
@@ -287,7 +287,7 @@ test_put_and_get(void)
    disk_cache_destroy(cache);
 
    setenv("MESA_GLSL_CACHE_MAX_SIZE", "1M", 1);
-   cache = disk_cache_create();
+   cache = disk_cache_create("test", "make_check");
 
    disk_cache_put(cache, blob_key, blob, sizeof(blob));
    disk_cache_put(cache, string_key, string, sizeof(string));
@@ -343,7 +343,7 @@ test_put_key_and_get_key(void)
                         { 0,  1, 42, 43, 44, 45, 46, 47, 48, 49,
                          50, 55, 52, 53, 54, 55, 56, 57, 58, 59};
 
-   cache = disk_cache_create();
+   cache = disk_cache_create("test", "make_check");
 
    /* First test that disk_cache_has_key returns false before disk_cache_put_key */
    result = disk_cache_has_key(cache, key_a);

src/util/disk_cache.c

@@ -115,7 +115,7 @@ mkdir_if_needed(char *path)
  *      <path>/<name> cannot be created as a directory
  */
 static char *
-concatenate_and_mkdir(void *ctx, char *path, char *name)
+concatenate_and_mkdir(void *ctx, char *path, const char *name)
 {
    char *new_path;
    struct stat sb;
@@ -131,8 +131,27 @@ concatenate_and_mkdir(void *ctx, char *path, char *name)
       return NULL;
 }
 
+static char *
+create_mesa_cache_dir(void *mem_ctx, char *path, const char *timestamp,
+                      const char *gpu_name)
+{
+   char *new_path = concatenate_and_mkdir(mem_ctx, path, "mesa");
+   if (new_path == NULL)
+      return NULL;
+
+   new_path = concatenate_and_mkdir(mem_ctx, new_path, timestamp);
+   if (new_path == NULL)
+      return NULL;
+
+   new_path = concatenate_and_mkdir(mem_ctx, new_path, gpu_name);
+   if (new_path == NULL)
+      return NULL;
+
+   return new_path;
+}
+
 struct disk_cache *
-disk_cache_create(void)
+disk_cache_create(const char *gpu_name, const char *timestamp)
 {
    void *local;
    struct disk_cache *cache = NULL;
@@ -176,7 +195,8 @@ disk_cache_create(void)
          if (mkdir_if_needed(xdg_cache_home) == -1)
             goto fail;
 
-         path = concatenate_and_mkdir(local, xdg_cache_home, "mesa");
+         path = create_mesa_cache_dir(local, xdg_cache_home, timestamp,
+                                      gpu_name);
          if (path == NULL)
             goto fail;
       }
@@ -212,7 +232,7 @@ disk_cache_create(void)
       if (path == NULL)
          goto fail;
 
-      path = concatenate_and_mkdir(local, path, "mesa");
+      path = create_mesa_cache_dir(local, path, timestamp, gpu_name);
       if (path == NULL)
          goto fail;
    }

src/util/disk_cache.h

@@ -69,7 +69,7 @@ struct disk_cache;
  * assistance in computing SHA-1 signatures.
  */
 struct disk_cache *
-disk_cache_create(void);
+disk_cache_create(const char *gpu_name, const char *timestamp);
 
 /**
  * Destroy a cache object, (freeing all associated resources).
@@ -140,7 +140,7 @@ disk_cache_has_key(struct disk_cache *cache, cache_key key);
 #else
 
 static inline struct disk_cache *
-disk_cache_create(void)
+disk_cache_create(const char *gpu_name, const char *timestamp)
 {
    return NULL;
 }