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intel-iommu: Clean up intel_map_sg(), remove domain_page_mapping() 

Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
This commit is contained in:
David Woodhouse 2009-06-28 14:49:31 +01:00
parent ad05122162
commit b536d24d21
1 changed files with 19 additions and 35 deletions
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54
drivers/pci/intel-iommu.c
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@ -1674,17 +1674,6 @@ static int domain_pfn_mapping(struct dmar_domain *domain, unsigned long iov_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)
@ -2745,17 +2734,16 @@ static int intel_nontranslate_map_sg(struct device *hddev,
static int intel_map_sg(struct device *hwdev, struct scatterlist *sglist, int nelems,
enum dma_data_direction dir, struct dma_attrs *attrs)
{
phys_addr_t addr;
int i;
struct pci_dev *pdev = to_pci_dev(hwdev);
struct dmar_domain *domain;
size_t size = 0;
int prot = 0;
size_t offset = 0;
size_t offset_pfn = 0;
struct iova *iova = NULL;
int ret;
struct scatterlist *sg;
unsigned long start_addr;
unsigned long start_vpfn;
struct intel_iommu *iommu;
BUG_ON(dir == DMA_NONE);
@ -2768,10 +2756,8 @@ static int intel_map_sg(struct device *hwdev, struct scatterlist *sglist, int ne
iommu = domain_get_iommu(domain);
for_each_sg(sglist, sg, nelems, i) {
addr = page_to_phys(sg_page(sg)) + sg->offset;
size += aligned_size((u64)addr, sg->length);
}
for_each_sg(sglist, sg, nelems, i)
size += aligned_size(sg->offset, sg->length);
iova = __intel_alloc_iova(hwdev, domain, size, pdev->dma_mask);
if (!iova) {
@ -2789,36 +2775,34 @@ static int intel_map_sg(struct device *hwdev, struct scatterlist *sglist, int ne
if (dir == DMA_FROM_DEVICE || dir == DMA_BIDIRECTIONAL)
prot |= DMA_PTE_WRITE;
start_addr = iova->pfn_lo << PAGE_SHIFT;
offset = 0;
start_vpfn = mm_to_dma_pfn(iova->pfn_lo);
offset_pfn = 0;
for_each_sg(sglist, sg, nelems, i) {
addr = page_to_phys(sg_page(sg)) + sg->offset;
size = aligned_size((u64)addr, sg->length);
ret = domain_page_mapping(domain, start_addr + offset,
((u64)addr) & PHYSICAL_PAGE_MASK,
size, prot);
int nr_pages = aligned_size(sg->offset, sg->length) >> VTD_PAGE_SHIFT;
ret = domain_pfn_mapping(domain, start_vpfn + offset_pfn,
page_to_dma_pfn(sg_page(sg)),
nr_pages, prot);
if (ret) {
/* clear the page */
dma_pte_clear_range(domain,
start_addr >> VTD_PAGE_SHIFT,
(start_addr + offset - 1) >> VTD_PAGE_SHIFT);
dma_pte_clear_range(domain, start_vpfn,
start_vpfn + offset_pfn);
/* free page tables */
dma_pte_free_pagetable(domain, start_addr >> VTD_PAGE_SHIFT,
(start_addr + offset - 1) >> VTD_PAGE_SHIFT);
dma_pte_free_pagetable(domain, start_vpfn,
start_vpfn + offset_pfn);
/* free iova */
__free_iova(&domain->iovad, iova);
return 0;
}
sg->dma_address = start_addr + offset +
((u64)addr & (~PAGE_MASK));
sg->dma_address = ((dma_addr_t)(start_vpfn + offset_pfn)
<< VTD_PAGE_SHIFT) + sg->offset;
sg->dma_length = sg->length;
offset += size;
offset_pfn += nr_pages;
}
/* it's a non-present to present mapping. Only flush if caching mode */
if (cap_caching_mode(iommu->cap))
iommu_flush_iotlb_psi(iommu, 0, start_addr,
offset >> VTD_PAGE_SHIFT);
iommu_flush_iotlb_psi(iommu, 0, start_vpfn << VTD_PAGE_SHIFT,
offset_pfn);
else
iommu_flush_write_buffer(iommu);