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/*-
* Copyright (c) 2010 Isilon Systems, Inc.
* Copyright (c) 2010 iX Systems, Inc.
* Copyright (c) 2010 Panasas, 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 unmodified, this list of conditions, and the following
* disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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_SCATTERLIST_H_
#define _LINUX_SCATTERLIST_H_
#include <linux/string.h>
#include <linux/page.h>
struct scatterlist {
union {
struct page *page;
struct scatterlist *sg;
} sl_un;
dma_addr_t address;
unsigned long offset;
uint32_t length;
uint32_t flags;
};
#define sg_dma_address(sg) (sg)->address
#define sg_dma_len(sg) (sg)->length
#define sg_page(sg) (sg)->sl_un.page
#define sg_scatternext(sg) (sg)->sl_un.sg
#define SG_END 0x01
#define SG_CHAIN 0x02
static inline void
sg_set_page(struct scatterlist *sg, struct page *page, unsigned int len,
unsigned int offset)
{
sg_page(sg) = page;
sg_dma_len(sg) = len;
sg->offset = offset;
if (offset > PAGE_SIZE)
panic("sg_set_page: Invalid offset %d\n", offset);
}
static inline void
sg_set_buf(struct scatterlist *sg, const void *buf, unsigned int buflen)
{
sg_set_page(sg, virt_to_page(buf), buflen,
((uintptr_t)buf) & ~PAGE_MASK);
}
static inline void
sg_init_table(struct scatterlist *sg, unsigned int nents)
{
bzero(sg, sizeof(*sg) * nents);
sg[nents - 1].flags = SG_END;
}
static inline struct scatterlist *
sg_next(struct scatterlist *sg)
{
if (sg->flags & SG_END)
return (NULL);
sg++;
if (sg->flags & SG_CHAIN)
sg = sg_scatternext(sg);
return (sg);
}
static inline vm_paddr_t
sg_phys(struct scatterlist *sg)
{
return sg_page(sg)->phys_addr + sg->offset;
}
#define for_each_sg(sglist, sg, sgmax, _itr) \
for (_itr = 0, sg = (sglist); _itr < (sgmax); _itr++, sg = sg_next(sg))
#endif /* _LINUX_SCATTERLIST_H_ */