diff options
Diffstat (limited to 'include/linux/genalloc.h')
| -rw-r--r-- | include/linux/genalloc.h | 136 |
1 files changed, 116 insertions, 20 deletions
diff --git a/include/linux/genalloc.h b/include/linux/genalloc.h index 661d374aeb2d..0bd581003cd5 100644 --- a/include/linux/genalloc.h +++ b/include/linux/genalloc.h @@ -1,3 +1,4 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ /* * Basic general purpose allocator for managing special purpose * memory, for example, memory that is not managed by the regular @@ -21,31 +22,35 @@ * 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; /** - * Allocation callback function type definition + * 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 @genpool_algo_t + * @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); + void *data, struct gen_pool *pool, + unsigned long start_addr); /* * General purpose special memory pool descriptor. @@ -57,6 +62,8 @@ struct gen_pool { genpool_algo_t algo; /* allocation function */ void *data; + + const char *name; }; /* @@ -64,17 +71,39 @@ struct gen_pool { */ struct gen_pool_chunk { struct list_head next_chunk; /* next chunk in pool */ - atomic_t avail; + atomic_long_t avail; 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 */ + void *owner; /* private data to retrieve at alloc time */ + unsigned long start_addr; /* start address of memory chunk */ + unsigned long end_addr; /* end address of memory chunk (inclusive) */ + unsigned long bits[]; /* 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); +extern int gen_pool_add_owner(struct gen_pool *, unsigned long, phys_addr_t, + size_t, int, void *); + +static inline int gen_pool_add_virt(struct gen_pool *pool, unsigned long addr, + phys_addr_t phys, size_t size, int nid) +{ + return gen_pool_add_owner(pool, addr, phys, size, nid, NULL); +} + /** * gen_pool_add - add a new chunk of special memory to the pool * @pool: pool to add new memory chunk to @@ -93,8 +122,56 @@ static inline int gen_pool_add(struct gen_pool *pool, unsigned long addr, 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); +unsigned long gen_pool_alloc_algo_owner(struct gen_pool *pool, size_t size, + genpool_algo_t algo, void *data, void **owner); + +static inline unsigned long gen_pool_alloc_owner(struct gen_pool *pool, + size_t size, void **owner) +{ + return gen_pool_alloc_algo_owner(pool, size, pool->algo, pool->data, + owner); +} + +static inline unsigned long gen_pool_alloc_algo(struct gen_pool *pool, + size_t size, genpool_algo_t algo, void *data) +{ + return gen_pool_alloc_algo_owner(pool, size, algo, data, NULL); +} + +/** + * gen_pool_alloc - allocate special memory from the pool + * @pool: pool to allocate from + * @size: number of bytes to allocate from the pool + * + * Allocate the requested number of bytes from the specified pool. + * Uses the pool allocation function (with first-fit algorithm by default). + * Can not be used in NMI handler on architectures without + * NMI-safe cmpxchg implementation. + */ +static inline unsigned long gen_pool_alloc(struct gen_pool *pool, size_t size) +{ + return gen_pool_alloc_algo(pool, size, pool->algo, pool->data); +} + +extern void *gen_pool_dma_alloc(struct gen_pool *pool, size_t size, + dma_addr_t *dma); +extern void *gen_pool_dma_alloc_algo(struct gen_pool *pool, size_t size, + dma_addr_t *dma, genpool_algo_t algo, void *data); +extern void *gen_pool_dma_alloc_align(struct gen_pool *pool, size_t size, + dma_addr_t *dma, int align); +extern void *gen_pool_dma_zalloc(struct gen_pool *pool, size_t size, dma_addr_t *dma); +extern void *gen_pool_dma_zalloc_algo(struct gen_pool *pool, size_t size, + dma_addr_t *dma, genpool_algo_t algo, void *data); +extern void *gen_pool_dma_zalloc_align(struct gen_pool *pool, size_t size, + dma_addr_t *dma, int align); +extern void gen_pool_free_owner(struct gen_pool *pool, unsigned long addr, + size_t size, void **owner); +static inline void gen_pool_free(struct gen_pool *pool, unsigned long addr, + size_t size) +{ + gen_pool_free_owner(pool, addr, size, NULL); +} + 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 *); @@ -104,20 +181,39 @@ 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); + unsigned long start, unsigned int nr, void *data, + struct gen_pool *pool, unsigned long start_addr); + +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, unsigned long start_addr); + +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, unsigned long start_addr); + + +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, unsigned long start_addr); extern unsigned long gen_pool_best_fit(unsigned long *map, unsigned long size, - unsigned long start, unsigned int nr, void *data); + unsigned long start, unsigned int nr, void *data, + struct gen_pool *pool, unsigned long start_addr); + extern struct gen_pool *devm_gen_pool_create(struct device *dev, - int min_alloc_order, int nid); -extern struct gen_pool *dev_get_gen_pool(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); + +extern bool gen_pool_has_addr(struct gen_pool *pool, unsigned long start, + size_t size); #ifdef CONFIG_OF -extern struct gen_pool *of_get_named_gen_pool(struct device_node *np, +extern struct gen_pool *of_gen_pool_get(struct device_node *np, const char *propname, int index); #else -static inline struct gen_pool *of_get_named_gen_pool(struct device_node *np, +static inline struct gen_pool *of_gen_pool_get(struct device_node *np, const char *propname, int index) { return NULL; |