diff options
Diffstat (limited to 'lib/genalloc.c')
| -rw-r--r-- | lib/genalloc.c | 55 |
1 files changed, 26 insertions, 29 deletions
diff --git a/lib/genalloc.c b/lib/genalloc.c index 7e85d1e37a6e..5257f74fccf3 100644 --- a/lib/genalloc.c +++ b/lib/genalloc.c @@ -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 @@ -23,9 +24,6 @@ * CONFIG_ARCH_HAVE_NMI_SAFE_CMPXCHG. * * Copyright 2005 (C) Jes Sorensen <jes@trained-monkey.org> - * - * This source code is licensed under the GNU General Public License, - * Version 2. See the file COPYING for more details. */ #include <linux/slab.h> @@ -168,20 +166,21 @@ struct gen_pool *gen_pool_create(int min_alloc_order, int nid) EXPORT_SYMBOL(gen_pool_create); /** - * gen_pool_add_virt - add a new chunk of special memory to the pool + * gen_pool_add_owner- add a new chunk of special memory to the pool * @pool: pool to add new memory chunk to * @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 + * @owner: private data the publisher would like to recall at alloc time * * 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_virt(struct gen_pool *pool, unsigned long virt, phys_addr_t phys, - size_t size, int nid) +int gen_pool_add_owner(struct gen_pool *pool, unsigned long virt, phys_addr_t phys, + size_t size, int nid, void *owner) { struct gen_pool_chunk *chunk; int nbits = size >> pool->min_alloc_order; @@ -195,6 +194,7 @@ int gen_pool_add_virt(struct gen_pool *pool, unsigned long virt, phys_addr_t phy chunk->phys_addr = phys; chunk->start_addr = virt; chunk->end_addr = virt + size - 1; + chunk->owner = owner; atomic_long_set(&chunk->avail, size); spin_lock(&pool->lock); @@ -203,7 +203,7 @@ int gen_pool_add_virt(struct gen_pool *pool, unsigned long virt, phys_addr_t phy return 0; } -EXPORT_SYMBOL(gen_pool_add_virt); +EXPORT_SYMBOL(gen_pool_add_owner); /** * gen_pool_virt_to_phys - return the physical address of memory @@ -260,35 +260,20 @@ void gen_pool_destroy(struct gen_pool *pool) EXPORT_SYMBOL(gen_pool_destroy); /** - * 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. - */ -unsigned long gen_pool_alloc(struct gen_pool *pool, size_t size) -{ - return gen_pool_alloc_algo(pool, size, pool->algo, pool->data); -} -EXPORT_SYMBOL(gen_pool_alloc); - -/** - * gen_pool_alloc_algo - allocate special memory from the pool + * gen_pool_alloc_algo_owner - allocate special memory from the pool * @pool: pool to allocate from * @size: number of bytes to allocate from the pool * @algo: algorithm passed from caller * @data: data passed to algorithm + * @owner: optionally retrieve the chunk owner * * 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. */ -unsigned long gen_pool_alloc_algo(struct gen_pool *pool, size_t size, - genpool_algo_t algo, void *data) +unsigned long gen_pool_alloc_algo_owner(struct gen_pool *pool, size_t size, + genpool_algo_t algo, void *data, void **owner) { struct gen_pool_chunk *chunk; unsigned long addr = 0; @@ -299,6 +284,9 @@ unsigned long gen_pool_alloc_algo(struct gen_pool *pool, size_t size, BUG_ON(in_nmi()); #endif + if (owner) + *owner = NULL; + if (size == 0) return 0; @@ -326,12 +314,14 @@ retry: addr = chunk->start_addr + ((unsigned long)start_bit << order); size = nbits << order; atomic_long_sub(size, &chunk->avail); + if (owner) + *owner = chunk->owner; break; } rcu_read_unlock(); return addr; } -EXPORT_SYMBOL(gen_pool_alloc_algo); +EXPORT_SYMBOL(gen_pool_alloc_algo_owner); /** * gen_pool_dma_alloc - allocate special memory from the pool for DMA usage @@ -367,12 +357,14 @@ EXPORT_SYMBOL(gen_pool_dma_alloc); * @pool: pool to free to * @addr: starting address of memory to free back to pool * @size: size in bytes of memory to free + * @owner: private data stashed at gen_pool_add() time * * Free previously allocated special memory back to the specified * pool. Can not be used in NMI handler on architectures without * NMI-safe cmpxchg implementation. */ -void gen_pool_free(struct gen_pool *pool, unsigned long addr, size_t size) +void gen_pool_free_owner(struct gen_pool *pool, unsigned long addr, size_t size, + void **owner) { struct gen_pool_chunk *chunk; int order = pool->min_alloc_order; @@ -382,6 +374,9 @@ void gen_pool_free(struct gen_pool *pool, unsigned long addr, size_t size) BUG_ON(in_nmi()); #endif + if (owner) + *owner = NULL; + nbits = (size + (1UL << order) - 1) >> order; rcu_read_lock(); list_for_each_entry_rcu(chunk, &pool->chunks, next_chunk) { @@ -392,6 +387,8 @@ void gen_pool_free(struct gen_pool *pool, unsigned long addr, size_t size) BUG_ON(remain); size = nbits << order; atomic_long_add(size, &chunk->avail); + if (owner) + *owner = chunk->owner; rcu_read_unlock(); return; } @@ -399,7 +396,7 @@ void gen_pool_free(struct gen_pool *pool, unsigned long addr, size_t size) rcu_read_unlock(); BUG(); } -EXPORT_SYMBOL(gen_pool_free); +EXPORT_SYMBOL(gen_pool_free_owner); /** * gen_pool_for_each_chunk - call func for every chunk of generic memory pool |