intel-iommu: Performance improvement for domain_pfn_mapping()
As with dma_pte_clear_range(), don't keep flushing a single PTE at a time. And also micro-optimise the setting of PTE values rather than using the helper functions to do all the masking. Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
This commit is contained in:
parent
310a5ab93c
commit
6f6a00e40a
|
@ -1639,7 +1639,7 @@ static int domain_pfn_mapping(struct dmar_domain *domain, unsigned long iov_pfn,
|
|||
unsigned long phys_pfn, unsigned long nr_pages,
|
||||
int prot)
|
||||
{
|
||||
struct dma_pte *pte;
|
||||
struct dma_pte *first_pte = NULL, *pte = NULL;
|
||||
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);
|
||||
|
@ -1647,19 +1647,27 @@ static int domain_pfn_mapping(struct dmar_domain *domain, unsigned long iov_pfn,
|
|||
if ((prot & (DMA_PTE_READ|DMA_PTE_WRITE)) == 0)
|
||||
return -EINVAL;
|
||||
|
||||
prot &= DMA_PTE_READ | DMA_PTE_WRITE | DMA_PTE_SNP;
|
||||
|
||||
while (nr_pages--) {
|
||||
pte = pfn_to_dma_pte(domain, iov_pfn);
|
||||
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));
|
||||
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));
|
||||
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++;
|
||||
}
|
||||
|
|
Loading…
Reference in a new issue