First-fit virtual space allocator

Change-Id: I75e6c7d1a6ff1fcebc81ec10bd86b79f2bf3dc22
Signed-off-by: Dave Barach <dave@barachs.net>

1 files changed, 71 insertions, 0 deletions

diff --git a/src/vppinfra/valloc.h b/src/vppinfra/valloc.h
new file mode 100644
index 00000000000..993844eb1bd
--- /dev/null
+++ b/src/vppinfra/valloc.h
@@ -0,0 +1,71 @@
+/*
+ * Copyright (c) 2018 Cisco and/or its affiliates.
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at:
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef included_valloc_h
+#define included_valloc_h
+#include <vppinfra/clib.h>
+#include <vppinfra/pool.h>
+#include <vppinfra/bitmap.h>
+#include <vppinfra/lock.h>
+#include <vppinfra/hash.h>
+
+/** @file
+    @brief Simple first-fit virtual space allocator
+*/
+
+typedef struct
+{
+  u32 next;			/**< next chunk pool index */
+  u32 prev;			/**< previous chunk pool index */
+  uword baseva;			/**< base VA for this chunk */
+  uword size;			/**< size in bytes of this chunk */
+  uword flags;			/**< flags (free/busy)  */
+} clib_valloc_chunk_t;
+
+#define CLIB_VALLOC_BUSY	(1<<0) /**< chunk is in use */
+
+typedef struct
+{
+  clib_valloc_chunk_t *chunks;	/**< pool of virtual chunks  */
+  uword *chunk_index_by_baseva;	/**< chunk by baseva hash */
+  clib_spinlock_t lock;		/**< spinlock */
+  uword flags;			/**< flags */
+  u32 first_index;		/**< pool index of first chunk in list */
+} clib_valloc_main_t;
+
+#define CLIB_VALLOC_INITIALIZED	(1<<0) /**< object has been initialized */
+
+/* doxygen tags in valloc.c */
+void clib_valloc_init (clib_valloc_main_t * vam,
+		       clib_valloc_chunk_t * template, int need_lock);
+void
+clib_valloc_add_chunk (clib_valloc_main_t * vam,
+		       clib_valloc_chunk_t * template);
+
+format_function_t format_valloc;
+
+uword clib_valloc_free (clib_valloc_main_t * vam, uword baseva);
+uword clib_valloc_alloc (clib_valloc_main_t * vam, uword size,
+			 int os_out_of_memory_on_failure);
+
+#endif /* included_valloc_h */
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */