2011-03-21 09:58:24 +00:00
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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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2015-10-21 08:51:49 +00:00
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* Copyright (c) 2013-2015 Mellanox Technologies, Ltd.
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2015-10-19 11:09:51 +00:00
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* Copyright (c) 2015 Matthew Dillon <dillon@backplane.com>
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2011-03-21 09:58:24 +00:00
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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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2015-10-20 19:08:26 +00:00
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*
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* $FreeBSD$
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2011-03-21 09:58:24 +00:00
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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/page.h>
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2014-10-15 13:40:29 +00:00
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#include <linux/slab.h>
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2011-03-21 09:58:24 +00:00
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struct scatterlist {
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union {
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2015-10-21 08:51:49 +00:00
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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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2011-03-21 09:58:24 +00:00
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};
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2014-08-27 13:21:53 +00:00
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struct sg_table {
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2015-10-21 08:51:49 +00:00
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struct scatterlist *sgl;
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unsigned int nents;
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unsigned int orig_nents;
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2014-08-27 13:21:53 +00:00
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};
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2015-10-19 11:09:51 +00:00
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struct sg_page_iter {
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2015-10-21 08:51:49 +00:00
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struct scatterlist *sg;
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unsigned int sg_pgoffset;
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unsigned int maxents;
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2015-10-19 11:09:51 +00:00
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};
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2015-10-21 08:51:49 +00:00
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#define SG_MAX_SINGLE_ALLOC (PAGE_SIZE / sizeof(struct scatterlist))
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2014-10-15 13:40:29 +00:00
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2011-03-21 09:58:24 +00:00
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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_SIZE - 1));
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2011-03-21 09:58:24 +00:00
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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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2014-10-15 13:40:29 +00:00
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static inline void
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sg_chain(struct scatterlist *prv, unsigned int prv_nents,
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struct scatterlist *sgl)
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2014-10-15 13:40:29 +00:00
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{
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struct scatterlist *sg = &prv[prv_nents - 1];
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sg->offset = 0;
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sg->length = 0;
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sg->flags = SG_CHAIN;
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sg->sl_un.sg = sgl;
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}
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2015-10-21 08:51:49 +00:00
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static inline void
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sg_mark_end(struct scatterlist *sg)
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2014-10-15 13:40:29 +00:00
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{
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2015-10-21 08:51:49 +00:00
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sg->flags = SG_END;
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2014-10-15 13:40:29 +00:00
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}
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static inline void
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__sg_free_table(struct sg_table *table, unsigned int max_ents)
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{
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struct scatterlist *sgl, *next;
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if (unlikely(!table->sgl))
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return;
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sgl = table->sgl;
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while (table->orig_nents) {
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unsigned int alloc_size = table->orig_nents;
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unsigned int sg_size;
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if (alloc_size > max_ents) {
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next = sgl[max_ents - 1].sl_un.sg;
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alloc_size = max_ents;
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sg_size = alloc_size - 1;
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} else {
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sg_size = alloc_size;
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next = NULL;
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}
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table->orig_nents -= sg_size;
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kfree(sgl);
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sgl = next;
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}
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table->sgl = NULL;
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}
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static inline void
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sg_free_table(struct sg_table *table)
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{
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__sg_free_table(table, SG_MAX_SINGLE_ALLOC);
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}
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static inline int
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__sg_alloc_table(struct sg_table *table, unsigned int nents,
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unsigned int max_ents, gfp_t gfp_mask)
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2014-10-15 13:40:29 +00:00
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{
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struct scatterlist *sg, *prv;
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unsigned int left;
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memset(table, 0, sizeof(*table));
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if (nents == 0)
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return -EINVAL;
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left = nents;
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prv = NULL;
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do {
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2015-10-21 08:51:49 +00:00
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unsigned int sg_size;
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unsigned int alloc_size = left;
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2014-10-15 13:40:29 +00:00
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if (alloc_size > max_ents) {
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alloc_size = max_ents;
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sg_size = alloc_size - 1;
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} else
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sg_size = alloc_size;
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left -= sg_size;
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sg = kmalloc(alloc_size * sizeof(struct scatterlist), gfp_mask);
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if (unlikely(!sg)) {
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if (prv)
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table->nents = ++table->orig_nents;
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return -ENOMEM;
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}
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sg_init_table(sg, alloc_size);
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table->nents = table->orig_nents += sg_size;
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if (prv)
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sg_chain(prv, max_ents, sg);
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else
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table->sgl = sg;
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if (!left)
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sg_mark_end(&sg[sg_size - 1]);
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prv = sg;
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} while (left);
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return 0;
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}
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static inline int
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sg_alloc_table(struct sg_table *table, unsigned int nents, gfp_t gfp_mask)
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{
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int ret;
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ret = __sg_alloc_table(table, nents, SG_MAX_SINGLE_ALLOC,
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2015-10-21 08:51:49 +00:00
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gfp_mask);
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2014-10-15 13:40:29 +00:00
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if (unlikely(ret))
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__sg_free_table(table, SG_MAX_SINGLE_ALLOC);
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return ret;
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}
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2015-10-19 11:09:51 +00:00
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static inline void
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_sg_iter_next(struct sg_page_iter *iter)
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{
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struct scatterlist *sg;
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unsigned int pgcount;
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sg = iter->sg;
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pgcount = (sg->offset + sg->length + PAGE_SIZE - 1) >> PAGE_SHIFT;
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++iter->sg_pgoffset;
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while (iter->sg_pgoffset >= pgcount) {
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iter->sg_pgoffset -= pgcount;
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sg = sg_next(sg);
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--iter->maxents;
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if (sg == NULL || iter->maxents == 0)
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break;
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pgcount = (sg->offset + sg->length + PAGE_SIZE - 1) >> PAGE_SHIFT;
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}
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iter->sg = sg;
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}
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static inline void
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_sg_iter_init(struct scatterlist *sgl, struct sg_page_iter *iter,
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2015-10-21 08:51:49 +00:00
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unsigned int nents, unsigned long pgoffset)
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2015-10-19 11:09:51 +00:00
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{
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if (nents) {
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iter->sg = sgl;
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iter->sg_pgoffset = pgoffset - 1;
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iter->maxents = nents;
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_sg_iter_next(iter);
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} else {
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iter->sg = NULL;
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iter->sg_pgoffset = 0;
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iter->maxents = 0;
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}
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}
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static inline dma_addr_t
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sg_page_iter_dma_address(struct sg_page_iter *spi)
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{
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return spi->sg->address + (spi->sg_pgoffset << PAGE_SHIFT);
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}
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#define for_each_sg_page(sgl, iter, nents, pgoffset) \
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for (_sg_iter_init(sgl, iter, nents, pgoffset); \
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(iter)->sg; _sg_iter_next(iter))
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2011-03-21 09:58:24 +00:00
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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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2015-10-21 08:51:49 +00:00
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#endif /* _LINUX_SCATTERLIST_H_ */
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