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intel-iommu: Introduce domain_pfn_mapping()

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... and use it in the trivial cases; the other callers want individual
(and bisectable) attention, since I screwed them up the first time...

Make the BUG_ON() happen on too-large virtual address rather than
physical address, too. That's the one we care about.

Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
This commit is contained in:
David Woodhouse 2009-06-28 11:55:58 +01:00
parent 1c5a46ed49
commit 61df744314
1 changed files with 24 additions and 14 deletions
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38
drivers/pci/intel-iommu.c
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@ -1643,40 +1643,48 @@ static int domain_context_mapped(struct pci_dev *pdev)
tmp->devfn);
}
static int
domain_page_mapping(struct dmar_domain *domain, dma_addr_t iova,
u64 hpa, size_t size, int prot)
static int domain_pfn_mapping(struct dmar_domain *domain, unsigned long iov_pfn,
unsigned long phys_pfn, unsigned long nr_pages,
int prot)
{
unsigned long start_pfn = hpa >> VTD_PAGE_SHIFT;
unsigned long last_pfn = (hpa + size - 1) >> VTD_PAGE_SHIFT;
struct dma_pte *pte;
int index = 0;
int addr_width = agaw_to_width(domain->agaw) - VTD_PAGE_SHIFT;
BUG_ON(addr_width < BITS_PER_LONG && last_pfn >> addr_width);
BUG_ON(addr_width < BITS_PER_LONG && (iov_pfn + nr_pages - 1) >> addr_width);
if ((prot & (DMA_PTE_READ|DMA_PTE_WRITE)) == 0)
return -EINVAL;
while (start_pfn <= last_pfn) {
pte = pfn_to_dma_pte(domain, (iova >> VTD_PAGE_SHIFT) + index);
while (nr_pages--) {
pte = pfn_to_dma_pte(domain, iov_pfn);
if (!pte)
return -ENOMEM;
/* We don't need lock here, nobody else
* touches the iova range
*/
BUG_ON(dma_pte_addr(pte));
dma_set_pte_pfn(pte, start_pfn);
dma_set_pte_pfn(pte, phys_pfn);
dma_set_pte_prot(pte, prot);
if (prot & DMA_PTE_SNP)
dma_set_pte_snp(pte);
domain_flush_cache(domain, pte, sizeof(*pte));
start_pfn++;
index++;
iov_pfn++;
phys_pfn++;
}
return 0;
}
static int domain_page_mapping(struct dmar_domain *domain, dma_addr_t iova,
u64 hpa, size_t size, int prot)
{
unsigned long first_pfn = hpa >> VTD_PAGE_SHIFT;
unsigned long last_pfn = (hpa + size - 1) >> VTD_PAGE_SHIFT;
return domain_pfn_mapping(domain, iova >> VTD_PAGE_SHIFT, first_pfn,
last_pfn - first_pfn + 1, prot);
}
static void iommu_detach_dev(struct intel_iommu *iommu, u8 bus, u8 devfn)
{
if (!iommu)
@ -1893,8 +1901,10 @@ static int iommu_domain_identity_map(struct dmar_domain *domain,
dma_pte_clear_range(domain, base >> VTD_PAGE_SHIFT,
(base + size - 1) >> VTD_PAGE_SHIFT);
return domain_page_mapping(domain, base, base, size,
DMA_PTE_READ|DMA_PTE_WRITE);
return domain_pfn_mapping(domain, base >> VTD_PAGE_SHIFT,
base >> VTD_PAGE_SHIFT,
size >> VTD_PAGE_SHIFT,
DMA_PTE_READ|DMA_PTE_WRITE);
}
static int iommu_prepare_identity_map(struct pci_dev *pdev,