forked from Minki/linux
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>
51 lines
1.5 KiB
C
51 lines
1.5 KiB
C
/* $Id: iommu_common.h,v 1.5 2001/12/11 09:41:01 davem Exp $
|
|
* iommu_common.h: UltraSparc SBUS/PCI common iommu declarations.
|
|
*
|
|
* Copyright (C) 1999 David S. Miller (davem@redhat.com)
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/types.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/scatterlist.h>
|
|
#include <linux/device.h>
|
|
|
|
#include <asm/iommu.h>
|
|
#include <asm/scatterlist.h>
|
|
|
|
/*
|
|
* These give mapping size of each iommu pte/tlb.
|
|
*/
|
|
#define IO_PAGE_SHIFT 13
|
|
#define IO_PAGE_SIZE (1UL << IO_PAGE_SHIFT)
|
|
#define IO_PAGE_MASK (~(IO_PAGE_SIZE-1))
|
|
#define IO_PAGE_ALIGN(addr) (((addr)+IO_PAGE_SIZE-1)&IO_PAGE_MASK)
|
|
|
|
#define IO_TSB_ENTRIES (128*1024)
|
|
#define IO_TSB_SIZE (IO_TSB_ENTRIES * 8)
|
|
|
|
/*
|
|
* This is the hardwired shift in the iotlb tag/data parts.
|
|
*/
|
|
#define IOMMU_PAGE_SHIFT 13
|
|
|
|
/* You are _strongly_ advised to enable the following debugging code
|
|
* any time you make changes to the sg code below, run it for a while
|
|
* with filesystems mounted read-only before buying the farm... -DaveM
|
|
*/
|
|
#undef VERIFY_SG
|
|
|
|
#ifdef VERIFY_SG
|
|
extern void verify_sglist(struct scatterlist *sg, int nents, iopte_t *iopte, int npages);
|
|
#endif
|
|
|
|
/* Two addresses are "virtually contiguous" if and only if:
|
|
* 1) They are equal, or...
|
|
* 2) They are both on a page boundary
|
|
*/
|
|
#define VCONTIG(__X, __Y) (((__X) == (__Y)) || \
|
|
(((__X) | (__Y)) << (64UL - PAGE_SHIFT)) == 0UL)
|
|
|
|
extern unsigned long prepare_sg(struct device *dev, struct scatterlist *sg, int nents);
|