204f3a0444
This is the first half of the attempt to use asm-generic/scatterlist.h on every architecture. There are only two ways to define scatterlist structure. So it's easy to convert every architecture to use asm-generic/scatterlist.h. This patch: The trick for ISA_DMA_THRESHOLD in asm-generic/scatterlist.h doesn't work for powerpc. This lets architectures defin ISA_DMA_THRESHOLD. Hopefully, we can remove ISA_DMA_THRESHOLD in the future; we can do better to decide if the bouncing is necessary or not. Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Richard Henderson <rth@twiddle.net> Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru> Cc: Matt Turner <mattst88@gmail.com> Cc: Russell King <linux@arm.linux.org.uk> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Paul Mackerras <paulus@samba.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
40 lines
1023 B
C
40 lines
1023 B
C
#ifndef __ASM_GENERIC_SCATTERLIST_H
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#define __ASM_GENERIC_SCATTERLIST_H
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#include <linux/types.h>
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struct scatterlist {
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#ifdef CONFIG_DEBUG_SG
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unsigned long sg_magic;
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#endif
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unsigned long page_link;
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unsigned int offset;
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unsigned int length;
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dma_addr_t dma_address;
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unsigned int dma_length;
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};
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/*
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* These macros should be used after a dma_map_sg call has been done
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* to get bus addresses of each of the SG entries and their lengths.
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* You should only work with the number of sg entries pci_map_sg
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* returns, or alternatively stop on the first sg_dma_len(sg) which
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* is 0.
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*/
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#define sg_dma_address(sg) ((sg)->dma_address)
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#ifndef sg_dma_len
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/*
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* Normally, you have an iommu on 64 bit machines, but not on 32 bit
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* machines. Architectures that are differnt should override this.
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*/
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#if __BITS_PER_LONG == 64
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#define sg_dma_len(sg) ((sg)->dma_length)
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#else
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#define sg_dma_len(sg) ((sg)->length)
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#endif /* 64 bit */
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#endif /* sg_dma_len */
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#define ARCH_HAS_SG_CHAIN
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#endif /* __ASM_GENERIC_SCATTERLIST_H */
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