2 files changed, 58 insertions, 9 deletions

diff --git a/include/linux/genalloc.h b/include/linux/genalloc.h
index b1c70f10c42b..5bbebda78b02 100644
--- a/include/linux/genalloc.h
+++ b/include/linux/genalloc.h
@@ -26,13 +26,33 @@ struct gen_pool {
 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 int gen_pool_add(struct gen_pool *, unsigned long, size_t, 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);
diff --git a/lib/genalloc.c b/lib/genalloc.c
index 1923f1490e72..577ddf805975 100644
--- a/lib/genalloc.c
+++ b/lib/genalloc.c
@@ -39,17 +39,20 @@ struct gen_pool *gen_pool_create(int min_alloc_order, int nid)
 EXPORT_SYMBOL(gen_pool_create);
 
 /**
- * gen_pool_add - add a new chunk of special memory to the pool
+ * gen_pool_add_virt - 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
+ * @virt: virtual starting address of memory chunk to add to pool
+ * @phys: physical 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.
  */
-int gen_pool_add(struct gen_pool *pool, unsigned long addr, size_t size,
-                 int nid)
+int gen_pool_add_virt(struct gen_pool *pool, unsigned long virt, phys_addr_t phys,
+                 size_t size, int nid)
 {
         struct gen_pool_chunk *chunk;
         int nbits = size >> pool->min_alloc_order;
@@ -58,11 +61,12 @@ int gen_pool_add(struct gen_pool *pool, unsigned long addr, size_t size,
 
         chunk = kmalloc_node(nbytes, GFP_KERNEL | __GFP_ZERO, nid);
         if (unlikely(chunk == NULL))
-                return -1;
+                return -ENOMEM;
 
         spin_lock_init(&chunk->lock);
-        chunk->start_addr = addr;
-        chunk->end_addr = addr + size;
+        chunk->phys_addr = phys;
+        chunk->start_addr = virt;
+        chunk->end_addr = virt + size;
 
         write_lock(&pool->lock);
         list_add(&chunk->next_chunk, &pool->chunks);
@@ -70,7 +74,32 @@ int gen_pool_add(struct gen_pool *pool, unsigned long addr, size_t size,
 
         return 0;
 }
-EXPORT_SYMBOL(gen_pool_add);
+EXPORT_SYMBOL(gen_pool_add_virt);
+
+/**
+ * gen_pool_virt_to_phys - return the physical address of memory
+ * @pool: pool to allocate from
+ * @addr: starting address of memory
+ *
+ * Returns the physical address on success, or -1 on error.
+ */
+phys_addr_t gen_pool_virt_to_phys(struct gen_pool *pool, unsigned long addr)
+{
+        struct list_head *_chunk;
+        struct gen_pool_chunk *chunk;
+
+        read_lock(&pool->lock);
+        list_for_each(_chunk, &pool->chunks) {
+                chunk = list_entry(_chunk, struct gen_pool_chunk, next_chunk);
+
+                if (addr >= chunk->start_addr && addr < chunk->end_addr)
+                        return chunk->phys_addr + addr - chunk->start_addr;
+        }
+        read_unlock(&pool->lock);
+
+        return -1;
+}
+EXPORT_SYMBOL(gen_pool_virt_to_phys);
 
 /**
  * gen_pool_destroy - destroy a special memory pool