mirror of
https://github.com/FEX-Emu/linux.git
synced 2024-12-22 17:33:01 +00:00
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>
77 lines
2.0 KiB
C
77 lines
2.0 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
|
|
|
|
#define SG_ENT_PHYS_ADDRESS(SG) (__pa(sg_virt((SG))))
|
|
|
|
static inline unsigned long iommu_num_pages(unsigned long vaddr,
|
|
unsigned long slen)
|
|
{
|
|
unsigned long npages;
|
|
|
|
npages = IO_PAGE_ALIGN(vaddr + slen) - (vaddr & IO_PAGE_MASK);
|
|
npages >>= IO_PAGE_SHIFT;
|
|
|
|
return npages;
|
|
}
|
|
|
|
static inline unsigned long calc_npages(struct scatterlist *sglist, int nelems)
|
|
{
|
|
unsigned long i, npages = 0;
|
|
struct scatterlist *sg;
|
|
|
|
for_each_sg(sglist, sg, nelems, i) {
|
|
unsigned long paddr = SG_ENT_PHYS_ADDRESS(sg);
|
|
npages += iommu_num_pages(paddr, sg->length);
|
|
}
|
|
|
|
return npages;
|
|
}
|
|
|
|
/* 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);
|