fde6a3c82d
This patch makes iommu respect segment size limits when merging sg lists. Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Cc: Jeff Garzik <jeff@garzik.org> Cc: James Bottomley <James.Bottomley@steeleye.com> Acked-by: Jens Axboe <jens.axboe@oracle.com> Cc: "David S. Miller" <davem@davemloft.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
50 lines
1.5 KiB
C
50 lines
1.5 KiB
C
/* $Id: iommu_common.h,v 1.5 2001/12/11 09:41:01 davem Exp $
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* iommu_common.h: UltraSparc SBUS/PCI common iommu declarations.
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*
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* Copyright (C) 1999 David S. Miller (davem@redhat.com)
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*/
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#include <linux/kernel.h>
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#include <linux/types.h>
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#include <linux/sched.h>
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#include <linux/mm.h>
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#include <linux/scatterlist.h>
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#include <linux/device.h>
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#include <asm/iommu.h>
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#include <asm/scatterlist.h>
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/*
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* These give mapping size of each iommu pte/tlb.
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*/
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#define IO_PAGE_SHIFT 13
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#define IO_PAGE_SIZE (1UL << IO_PAGE_SHIFT)
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#define IO_PAGE_MASK (~(IO_PAGE_SIZE-1))
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#define IO_PAGE_ALIGN(addr) (((addr)+IO_PAGE_SIZE-1)&IO_PAGE_MASK)
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#define IO_TSB_ENTRIES (128*1024)
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#define IO_TSB_SIZE (IO_TSB_ENTRIES * 8)
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/*
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* This is the hardwired shift in the iotlb tag/data parts.
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*/
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#define IOMMU_PAGE_SHIFT 13
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/* You are _strongly_ advised to enable the following debugging code
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* any time you make changes to the sg code below, run it for a while
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* with filesystems mounted read-only before buying the farm... -DaveM
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*/
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#undef VERIFY_SG
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#ifdef VERIFY_SG
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extern void verify_sglist(struct scatterlist *sg, int nents, iopte_t *iopte, int npages);
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#endif
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/* Two addresses are "virtually contiguous" if and only if:
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* 1) They are equal, or...
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* 2) They are both on a page boundary
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*/
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#define VCONTIG(__X, __Y) (((__X) == (__Y)) || \
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(((__X) | (__Y)) << (64UL - PAGE_SHIFT)) == 0UL)
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extern unsigned long prepare_sg(struct device *dev, struct scatterlist *sg, int nents);
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