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