v4.19.13 snapshot.
diff --git a/include/linux/genalloc.h b/include/linux/genalloc.h
new file mode 100644
index 0000000..872f930
--- /dev/null
+++ b/include/linux/genalloc.h
@@ -0,0 +1,171 @@
+/*
+ * Basic general purpose allocator for managing special purpose
+ * memory, for example, memory that is not managed by the regular
+ * kmalloc/kfree interface. Uses for this includes on-device special
+ * memory, uncached memory etc.
+ *
+ * It is safe to use the allocator in NMI handlers and other special
+ * unblockable contexts that could otherwise deadlock on locks. This
+ * is implemented by using atomic operations and retries on any
+ * conflicts. The disadvantage is that there may be livelocks in
+ * extreme cases. For better scalability, one allocator can be used
+ * for each CPU.
+ *
+ * The lockless operation only works if there is enough memory
+ * available. If new memory is added to the pool a lock has to be
+ * still taken. So any user relying on locklessness has to ensure
+ * that sufficient memory is preallocated.
+ *
+ * The basic atomic operation of this allocator is cmpxchg on long.
+ * On architectures that don't have NMI-safe cmpxchg implementation,
+ * the allocator can NOT be used in NMI handler. So code uses the
+ * allocator in NMI handler should depend on
+ * CONFIG_ARCH_HAVE_NMI_SAFE_CMPXCHG.
+ *
+ * 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__
+
+#include <linux/types.h>
+#include <linux/spinlock_types.h>
+#include <linux/atomic.h>
+
+struct device;
+struct device_node;
+struct gen_pool;
+
+/**
+ * typedef genpool_algo_t: Allocation callback function type definition
+ * @map: Pointer to bitmap
+ * @size: The bitmap size in bits
+ * @start: The bitnumber to start searching at
+ * @nr: The number of zeroed bits we're looking for
+ * @data: optional additional data used by the callback
+ * @pool: the pool being allocated from
+ */
+typedef unsigned long (*genpool_algo_t)(unsigned long *map,
+ unsigned long size,
+ unsigned long start,
+ unsigned int nr,
+ void *data, struct gen_pool *pool);
+
+/*
+ * General purpose special memory pool descriptor.
+ */
+struct gen_pool {
+ spinlock_t lock;
+ struct list_head chunks; /* list of chunks in this pool */
+ int min_alloc_order; /* minimum allocation order */
+
+ genpool_algo_t algo; /* allocation function */
+ void *data;
+
+ const char *name;
+};
+
+/*
+ * General purpose special memory pool chunk descriptor.
+ */
+struct gen_pool_chunk {
+ struct list_head next_chunk; /* next chunk in pool */
+ atomic_long_t avail;
+ phys_addr_t phys_addr; /* physical starting address of memory chunk */
+ unsigned long start_addr; /* start address of memory chunk */
+ unsigned long end_addr; /* end address of memory chunk (inclusive) */
+ unsigned long bits[0]; /* bitmap for allocating memory chunk */
+};
+
+/*
+ * gen_pool data descriptor for gen_pool_first_fit_align.
+ */
+struct genpool_data_align {
+ int align; /* alignment by bytes for starting address */
+};
+
+/*
+ * gen_pool data descriptor for gen_pool_fixed_alloc.
+ */
+struct genpool_data_fixed {
+ unsigned long offset; /* The offset of the specific region */
+};
+
+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 unsigned long gen_pool_alloc_algo(struct gen_pool *, size_t,
+ genpool_algo_t algo, void *data);
+extern void *gen_pool_dma_alloc(struct gen_pool *pool, size_t size,
+ dma_addr_t *dma);
+extern void gen_pool_free(struct gen_pool *, unsigned long, size_t);
+extern void gen_pool_for_each_chunk(struct gen_pool *,
+ void (*)(struct gen_pool *, struct gen_pool_chunk *, void *), void *);
+extern size_t gen_pool_avail(struct gen_pool *);
+extern size_t gen_pool_size(struct gen_pool *);
+
+extern void gen_pool_set_algo(struct gen_pool *pool, genpool_algo_t algo,
+ void *data);
+
+extern unsigned long gen_pool_first_fit(unsigned long *map, unsigned long size,
+ unsigned long start, unsigned int nr, void *data,
+ struct gen_pool *pool);
+
+extern unsigned long gen_pool_fixed_alloc(unsigned long *map,
+ unsigned long size, unsigned long start, unsigned int nr,
+ void *data, struct gen_pool *pool);
+
+extern unsigned long gen_pool_first_fit_align(unsigned long *map,
+ unsigned long size, unsigned long start, unsigned int nr,
+ void *data, struct gen_pool *pool);
+
+
+extern unsigned long gen_pool_first_fit_order_align(unsigned long *map,
+ unsigned long size, unsigned long start, unsigned int nr,
+ void *data, struct gen_pool *pool);
+
+extern unsigned long gen_pool_best_fit(unsigned long *map, unsigned long size,
+ unsigned long start, unsigned int nr, void *data,
+ struct gen_pool *pool);
+
+
+extern struct gen_pool *devm_gen_pool_create(struct device *dev,
+ int min_alloc_order, int nid, const char *name);
+extern struct gen_pool *gen_pool_get(struct device *dev, const char *name);
+
+bool addr_in_gen_pool(struct gen_pool *pool, unsigned long start,
+ size_t size);
+
+#ifdef CONFIG_OF
+extern struct gen_pool *of_gen_pool_get(struct device_node *np,
+ const char *propname, int index);
+#else
+static inline struct gen_pool *of_gen_pool_get(struct device_node *np,
+ const char *propname, int index)
+{
+ return NULL;
+}
+#endif
+#endif /* __GENALLOC_H__ */