1 files changed, 59 insertions, 0 deletions
diff --git a/include/linux/genalloc.h b/include/linux/genalloc.h
new file mode 100644
index 00000000..5bbebda7
--- /dev/null
+++ b/include/linux/genalloc.h
@@ -0,0 +1,59 @@
+/*
+ * Basic general purpose allocator for managing special purpose memory
+ * not managed by the regular kmalloc/kfree interface.
+ * Uses for this includes on-device special memory, uncached memory
+ * etc.
+ *
+ * This source code is licensed under the GNU General Public License,
+ * Version 2.  See the file COPYING for more details.
+ */
+
+
+#ifndef __GENALLOC_H__
+#define __GENALLOC_H__
+/*
+ *  General purpose special memory pool descriptor.
+ */
+struct gen_pool {
+	rwlock_t lock;
+	struct list_head chunks;	/* list of chunks in this pool */
+	int min_alloc_order;		/* minimum allocation order */
+};
+
+/*
+ *  General purpose special memory pool chunk descriptor.
+ */
+struct gen_pool_chunk {
+	spinlock_t lock;
+	struct list_head next_chunk;	/* next chunk in pool */
+	phys_addr_t phys_addr;		/* physical starting address of memory chunk */
+	unsigned long start_addr;	/* starting address of memory chunk */
+	unsigned long end_addr;		/* ending address of memory chunk */
+	unsigned long bits[0];		/* bitmap for allocating memory chunk */
+};
+
+extern struct gen_pool *gen_pool_create(int, int);
+extern phys_addr_t gen_pool_virt_to_phys(struct gen_pool *pool, unsigned long);
+extern int gen_pool_add_virt(struct gen_pool *, unsigned long, phys_addr_t,
+			     size_t, int);
+/**
+ * gen_pool_add - add a new chunk of special memory to the pool
+ * @pool: pool to add new memory chunk to
+ * @addr: starting address of memory chunk to add to pool
+ * @size: size in bytes of the memory chunk to add to pool
+ * @nid: node id of the node the chunk structure and bitmap should be
+ *       allocated on, or -1
+ *
+ * Add a new chunk of special memory to the specified pool.
+ *
+ * Returns 0 on success or a -ve errno on failure.
+ */
+static inline int gen_pool_add(struct gen_pool *pool, unsigned long addr,
+			       size_t size, int nid)
+{
+	return gen_pool_add_virt(pool, addr, -1, size, nid);
+}
+extern void gen_pool_destroy(struct gen_pool *);
+extern unsigned long gen_pool_alloc(struct gen_pool *, size_t);
+extern void gen_pool_free(struct gen_pool *, unsigned long, size_t);
+#endif /* __GENALLOC_H__ */