38192d52f1
Changeset fde6a3c82d ("iommu sg merging:
sparc64: make iommu respect the segment size limits") broke sparc64
because whilst it added the segment limiting code to the first pass of
SG mapping (in prepare_sg()) it did not add matching code to the
second pass handling (in fill_sg())
As a result the two passes disagree where the segment boundaries
should be, resulting in OOPSes, DMA corruption, and corrupted
superblocks.
Signed-off-by: David S. Miller <davem@davemloft.net>
76 lines
2 KiB
C
76 lines
2 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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#define SG_ENT_PHYS_ADDRESS(SG) (__pa(sg_virt((SG))))
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static inline unsigned long iommu_num_pages(unsigned long vaddr,
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unsigned long slen)
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{
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unsigned long npages;
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npages = IO_PAGE_ALIGN(vaddr + slen) - (vaddr & IO_PAGE_MASK);
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npages >>= IO_PAGE_SHIFT;
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return npages;
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}
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static inline unsigned long calc_npages(struct scatterlist *sglist, int nelems)
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{
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unsigned long i, npages = 0;
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struct scatterlist *sg;
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for_each_sg(sglist, sg, nelems, i) {
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unsigned long paddr = SG_ENT_PHYS_ADDRESS(sg);
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npages += iommu_num_pages(paddr, sg->length);
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}
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return npages;
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}
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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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