99 lines
2.9 KiB
C
99 lines
2.9 KiB
C
/*-
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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_SCATTERLIST_H_
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#define _LINUX_SCATTERLIST_H_
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#include <linux/string.h>
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#include <linux/page.h>
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struct scatterlist {
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union {
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struct page *page;
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struct scatterlist *sg;
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} sl_un;
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dma_addr_t address;
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unsigned long offset;
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uint32_t length;
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uint32_t flags;
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};
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#define sg_dma_address(sg) (sg)->address
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#define sg_dma_len(sg) (sg)->length
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#define sg_page(sg) (sg)->sl_un.page
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#define sg_scatternext(sg) (sg)->sl_un.sg
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#define SG_END 0x01
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#define SG_CHAIN 0x02
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static inline void
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sg_set_page(struct scatterlist *sg, struct page *page, unsigned int len,
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unsigned int offset)
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{
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sg_page(sg) = page;
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sg_dma_len(sg) = len;
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sg->offset = offset;
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if (offset > PAGE_SIZE)
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panic("sg_set_page: Invalid offset %d\n", offset);
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}
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static inline void
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sg_set_buf(struct scatterlist *sg, const void *buf, unsigned int buflen)
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{
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sg_set_page(sg, virt_to_page(buf), buflen,
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((uintptr_t)buf) & ~PAGE_MASK);
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}
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static inline void
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sg_init_table(struct scatterlist *sg, unsigned int nents)
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{
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bzero(sg, sizeof(*sg) * nents);
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sg[nents - 1].flags = SG_END;
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}
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static inline struct scatterlist *
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sg_next(struct scatterlist *sg)
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{
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if (sg->flags & SG_END)
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return (NULL);
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sg++;
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if (sg->flags & SG_CHAIN)
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sg = sg_scatternext(sg);
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return (sg);
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}
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static inline vm_paddr_t
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sg_phys(struct scatterlist *sg)
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{
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return sg_page(sg)->phys_addr + sg->offset;
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}
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#define for_each_sg(sglist, sg, sgmax, _itr) \
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for (_itr = 0, sg = (sglist); _itr < (sgmax); _itr++, sg = sg_next(sg))
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#endif /* _LINUX_SCATTERLIST_H_ */
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