/************************************************************************** Copyright (c) 2007, 2008 Chelsio Inc. All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: 1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. 2. Neither the name of the Chelsio Corporation nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. ***************************************************************************/ #ifndef _LINUX_GENALLOC_H #define _LINUX_GENALLOC_H #include #include struct gen_pool { blist_t gen_list; daddr_t gen_base; int gen_chunk_shift; struct mtx gen_lock; }; static inline struct gen_pool * gen_pool_create(int min_alloc_order, int nid) { struct gen_pool *gp; gp = malloc(sizeof(*gp), M_DEVBUF, M_NOWAIT | M_ZERO); if (gp == NULL) return (NULL); gp->gen_chunk_shift = min_alloc_order; mtx_init(&gp->gen_lock, "genpool", NULL, MTX_DEF); return (gp); } static inline int gen_pool_add_virt(struct gen_pool *gp, daddr_t virt, daddr_t phys, size_t size, int nid) { (void)phys; (void)nid; if (gp->gen_base != 0) return (-ENOMEM); gp->gen_list = blist_create(size >> gp->gen_chunk_shift, M_NOWAIT); if (gp->gen_list == NULL) return (-ENOMEM); gp->gen_base = virt; blist_free(gp->gen_list, 0, size >> gp->gen_chunk_shift); return (0); } static inline int gen_pool_add(struct gen_pool *gp, daddr_t addr, size_t size, int nid) { return (gen_pool_add_virt(gp, addr, -1, size, nid)); } static inline daddr_t gen_pool_alloc(struct gen_pool *gp, size_t size) { int chunks; daddr_t blkno; chunks = (size + (1 << gp->gen_chunk_shift) - 1) >> gp->gen_chunk_shift; mtx_lock(&gp->gen_lock); blkno = blist_alloc(gp->gen_list, &chunks, chunks); mtx_unlock(&gp->gen_lock); if (blkno == SWAPBLK_NONE) return (0); return (gp->gen_base + ((1 << gp->gen_chunk_shift) * blkno)); } static inline void gen_pool_free(struct gen_pool *gp, daddr_t address, size_t size) { int chunks; daddr_t blkno; chunks = (size + (1<gen_chunk_shift) - 1) >> gp->gen_chunk_shift; blkno = (address - gp->gen_base) / (1 << gp->gen_chunk_shift); mtx_lock(&gp->gen_lock); blist_free(gp->gen_list, blkno, chunks); mtx_unlock(&gp->gen_lock); } static __inline void gen_pool_destroy(struct gen_pool *gp) { blist_destroy(gp->gen_list); free(gp, M_DEVBUF); } static inline struct gen_pool * devm_gen_pool_create(struct device *dev, int min_alloc_order, int nid, const char *name) { (void)dev; (void)name; return (gen_pool_create(min_alloc_order, nid)); } #endif /* _LINUX_GENALLOC_H */