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2024-05-10 37f49e37ab4cb5d0bc4c60eb5c6d4dd57db767bb

 kernel/include/linux/genalloc.h
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@@ -1,3 +1,4 @@
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+/* SPDX-License-Identifier: GPL-2.0-only */
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 /*
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  * Basic general purpose allocator for managing special purpose
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  * memory, for example, memory that is not managed by the regular
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@@ -21,9 +22,6 @@
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  * the allocator can NOT be used in NMI handler.  So code uses the
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  * allocator in NMI handler should depend on
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  * CONFIG_ARCH_HAVE_NMI_SAFE_CMPXCHG.
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- *
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- * This source code is licensed under the GNU General Public License,
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- * Version 2.  See the file COPYING for more details.
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  */
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@@ -75,9 +73,10 @@
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 	struct list_head next_chunk;	/* next chunk in pool */
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 	atomic_long_t avail;
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 	phys_addr_t phys_addr;		/* physical starting address of memory chunk */
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+	void *owner;			/* private data to retrieve at alloc time */
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 	unsigned long start_addr;	/* start address of memory chunk */
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 	unsigned long end_addr;		/* end address of memory chunk (inclusive) */
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-	unsigned long bits[0];		/* bitmap for allocating memory chunk */
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+	unsigned long bits[];		/* bitmap for allocating memory chunk */
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 };
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 /*
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@@ -96,8 +95,15 @@
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 extern struct gen_pool *gen_pool_create(int, int);
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 extern phys_addr_t gen_pool_virt_to_phys(struct gen_pool *pool, unsigned long);
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-extern int gen_pool_add_virt(struct gen_pool *, unsigned long, phys_addr_t,
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-			     size_t, int);
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+extern int gen_pool_add_owner(struct gen_pool *, unsigned long, phys_addr_t,
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+			     size_t, int, void *);
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+
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+static inline int gen_pool_add_virt(struct gen_pool *pool, unsigned long addr,
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+		phys_addr_t phys, size_t size, int nid)
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+{
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+	return gen_pool_add_owner(pool, addr, phys, size, nid, NULL);
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+}
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+
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 /**
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  * gen_pool_add - add a new chunk of special memory to the pool
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  * @pool: pool to add new memory chunk to
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@@ -116,12 +122,56 @@
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 	return gen_pool_add_virt(pool, addr, -1, size, nid);
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 }
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 extern void gen_pool_destroy(struct gen_pool *);
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-extern unsigned long gen_pool_alloc(struct gen_pool *, size_t);
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-extern unsigned long gen_pool_alloc_algo(struct gen_pool *, size_t,
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-		genpool_algo_t algo, void *data);
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+unsigned long gen_pool_alloc_algo_owner(struct gen_pool *pool, size_t size,
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+		genpool_algo_t algo, void *data, void **owner);
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+
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+static inline unsigned long gen_pool_alloc_owner(struct gen_pool *pool,
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+		size_t size, void **owner)
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+{
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+	return gen_pool_alloc_algo_owner(pool, size, pool->algo, pool->data,
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+			owner);
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+}
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+
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+static inline unsigned long gen_pool_alloc_algo(struct gen_pool *pool,
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+		size_t size, genpool_algo_t algo, void *data)
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+{
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+	return gen_pool_alloc_algo_owner(pool, size, algo, data, NULL);
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+}
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+
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+/**
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+ * gen_pool_alloc - allocate special memory from the pool
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+ * @pool: pool to allocate from
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+ * @size: number of bytes to allocate from the pool
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+ *
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+ * Allocate the requested number of bytes from the specified pool.
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+ * Uses the pool allocation function (with first-fit algorithm by default).
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+ * Can not be used in NMI handler on architectures without
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+ * NMI-safe cmpxchg implementation.
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+ */
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+static inline unsigned long gen_pool_alloc(struct gen_pool *pool, size_t size)
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+{
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+	return gen_pool_alloc_algo(pool, size, pool->algo, pool->data);
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+}
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+
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 extern void *gen_pool_dma_alloc(struct gen_pool *pool, size_t size,
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 		dma_addr_t *dma);
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-extern void gen_pool_free(struct gen_pool *, unsigned long, size_t);
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+extern void *gen_pool_dma_alloc_algo(struct gen_pool *pool, size_t size,
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+		dma_addr_t *dma, genpool_algo_t algo, void *data);
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+extern void *gen_pool_dma_alloc_align(struct gen_pool *pool, size_t size,
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+		dma_addr_t *dma, int align);
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+extern void *gen_pool_dma_zalloc(struct gen_pool *pool, size_t size, dma_addr_t *dma);
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+extern void *gen_pool_dma_zalloc_algo(struct gen_pool *pool, size_t size,
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+		dma_addr_t *dma, genpool_algo_t algo, void *data);
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+extern void *gen_pool_dma_zalloc_align(struct gen_pool *pool, size_t size,
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+		dma_addr_t *dma, int align);
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+extern void gen_pool_free_owner(struct gen_pool *pool, unsigned long addr,
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+		size_t size, void **owner);
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+static inline void gen_pool_free(struct gen_pool *pool, unsigned long addr,
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+                size_t size)
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+{
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+	gen_pool_free_owner(pool, addr, size, NULL);
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+}
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+
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 extern void gen_pool_for_each_chunk(struct gen_pool *,
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 	void (*)(struct gen_pool *, struct gen_pool_chunk *, void *), void *);
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 extern size_t gen_pool_avail(struct gen_pool *);
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@@ -156,7 +206,7 @@
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 		int min_alloc_order, int nid, const char *name);
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 extern struct gen_pool *gen_pool_get(struct device *dev, const char *name);
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-bool addr_in_gen_pool(struct gen_pool *pool, unsigned long start,
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+extern bool gen_pool_has_addr(struct gen_pool *pool, unsigned long start,
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 			size_t size);
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 #ifdef CONFIG_OF