redonkable/remarkable-linux
redonkable/remarkable-linux
1
0
Fork 0
Code Releases Activity

intel-iommu: Combine domain_pfn_mapping() and domain_sg_mapping()

Browse source 
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
This commit is contained in:
David Woodhouse 2009-06-29 12:30:54 +01:00
parent e1605495c7
commit 9051aa0268
1 changed files with 22 additions and 40 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

62
drivers/pci/intel-iommu.c
View file

@ -1635,14 +1635,14 @@ static int domain_context_mapped(struct pci_dev *pdev)
tmp->devfn); tmp->devfn);
} }
static int domain_sg_mapping(struct dmar_domain *domain, unsigned long iov_pfn, static int __domain_mapping(struct dmar_domain *domain, unsigned long iov_pfn,
struct scatterlist *sg, unsigned long nr_pages, struct scatterlist *sg, unsigned long phys_pfn,
int prot) unsigned long nr_pages, int prot)
{ {
struct dma_pte *first_pte = NULL, *pte = NULL; struct dma_pte *first_pte = NULL, *pte = NULL;
uint64_t pteval; phys_addr_t uninitialized_var(pteval);
int addr_width = agaw_to_width(domain->agaw) - VTD_PAGE_SHIFT; int addr_width = agaw_to_width(domain->agaw) - VTD_PAGE_SHIFT;
unsigned long sg_res = 0; unsigned long sg_res;
BUG_ON(addr_width < BITS_PER_LONG && (iov_pfn + nr_pages - 1) >> addr_width); BUG_ON(addr_width < BITS_PER_LONG && (iov_pfn + nr_pages - 1) >> addr_width);
@ -1651,6 +1651,13 @@ static int domain_sg_mapping(struct dmar_domain *domain, unsigned long iov_pfn,
prot &= DMA_PTE_READ | DMA_PTE_WRITE | DMA_PTE_SNP; prot &= DMA_PTE_READ | DMA_PTE_WRITE | DMA_PTE_SNP;
if (sg)
sg_res = 0;
else {
sg_res = nr_pages + 1;
pteval = ((phys_addr_t)phys_pfn << VTD_PAGE_SHIFT) | prot;
}
while (nr_pages--) { while (nr_pages--) {
if (!sg_res) { if (!sg_res) {
sg_res = (sg->offset + sg->length + VTD_PAGE_SIZE - 1) >> VTD_PAGE_SHIFT; sg_res = (sg->offset + sg->length + VTD_PAGE_SIZE - 1) >> VTD_PAGE_SHIFT;
@ -1685,43 +1692,18 @@ static int domain_sg_mapping(struct dmar_domain *domain, unsigned long iov_pfn,
return 0; return 0;
} }
static int domain_pfn_mapping(struct dmar_domain *domain, unsigned long iov_pfn, static inline int domain_sg_mapping(struct dmar_domain *domain, unsigned long iov_pfn,
unsigned long phys_pfn, unsigned long nr_pages, struct scatterlist *sg, unsigned long nr_pages,
int prot) int prot)
{ {
struct dma_pte *first_pte = NULL, *pte = NULL; return __domain_mapping(domain, iov_pfn, sg, 0, nr_pages, prot);
int addr_width = agaw_to_width(domain->agaw) - VTD_PAGE_SHIFT; }
BUG_ON(addr_width < BITS_PER_LONG && (iov_pfn + nr_pages - 1) >> addr_width); static inline int domain_pfn_mapping(struct dmar_domain *domain, unsigned long iov_pfn,
unsigned long phys_pfn, unsigned long nr_pages,
if ((prot & (DMA_PTE_READ|DMA_PTE_WRITE)) == 0) int prot)
return -EINVAL; {
return __domain_mapping(domain, iov_pfn, NULL, phys_pfn, nr_pages, prot);
prot &= DMA_PTE_READ | DMA_PTE_WRITE | DMA_PTE_SNP;
while (nr_pages--) {
if (!pte) {
first_pte = 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));
pte->val = (phys_pfn << VTD_PAGE_SHIFT) | prot;
pte++;
if (!nr_pages ||
(unsigned long)pte >> VTD_PAGE_SHIFT !=
(unsigned long)first_pte >> VTD_PAGE_SHIFT) {
domain_flush_cache(domain, first_pte,
(void *)pte - (void *)first_pte);
pte = NULL;
}
iov_pfn++;
phys_pfn++;
}
return 0;
} }
static void iommu_detach_dev(struct intel_iommu *iommu, u8 bus, u8 devfn) static void iommu_detach_dev(struct intel_iommu *iommu, u8 bus, u8 devfn)