86 lines
2.5 KiB
C
86 lines
2.5 KiB
C
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/*-
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* Copyright (c) 2010 Isilon Systems, Inc.
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* Copyright (c) 2010 iX Systems, Inc.
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* Copyright (c) 2010 Panasas, Inc.
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* All rights reserved.
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*
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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
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice unmodified, this list of conditions, and the following
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* disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _LINUX_DMAPOOL_H_
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#define _LINUX_DMAPOOL_H_
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#include <linux/types.h>
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#include <linux/io.h>
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#include <linux/scatterlist.h>
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#include <linux/device.h>
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#include <linux/slab.h>
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struct dma_pool {
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uma_zone_t pool_zone;
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};
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static inline struct dma_pool *
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dma_pool_create(char *name, struct device *dev, size_t size,
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size_t align, size_t boundary)
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{
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struct dma_pool *pool;
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pool = kmalloc(sizeof(*pool), GFP_KERNEL);
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align--;
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/*
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* XXX Eventually this could use a seperate allocf to honor boundary
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* and physical address requirements of the device.
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*/
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pool->pool_zone = uma_zcreate(name, size, NULL, NULL, NULL, NULL,
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align, UMA_ZONE_OFFPAGE|UMA_ZONE_HASH);
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return (pool);
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}
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static inline void
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dma_pool_destroy(struct dma_pool *pool)
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{
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uma_zdestroy(pool->pool_zone);
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kfree(pool);
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}
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static inline void *
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dma_pool_alloc(struct dma_pool *pool, gfp_t mem_flags, dma_addr_t *handle)
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{
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void *vaddr;
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vaddr = uma_zalloc(pool->pool_zone, mem_flags);
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if (vaddr)
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*handle = vtophys(vaddr);
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return (vaddr);
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}
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static inline void
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dma_pool_free(struct dma_pool *pool, void *vaddr, dma_addr_t addr)
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{
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uma_zfree(pool->pool_zone, vaddr);
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}
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#endif /* _LINUX_DMAPOOL_H_ */
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