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Diffstat (limited to 'arch')
-rw-r--r--arch/ia64/pci/pci.c22
1 files changed, 17 insertions, 5 deletions
diff --git a/arch/ia64/pci/pci.c b/arch/ia64/pci/pci.c
index 73696b4a2ee..07d0e92742c 100644
--- a/arch/ia64/pci/pci.c
+++ b/arch/ia64/pci/pci.c
@@ -591,6 +591,9 @@ int
pci_mmap_page_range (struct pci_dev *dev, struct vm_area_struct *vma,
enum pci_mmap_state mmap_state, int write_combine)
{
+ unsigned long size = vma->vm_end - vma->vm_start;
+ pgprot_t prot;
+
/*
* I/O space cannot be accessed via normal processor loads and
* stores on this platform.
@@ -604,15 +607,24 @@ pci_mmap_page_range (struct pci_dev *dev, struct vm_area_struct *vma,
*/
return -EINVAL;
+ if (!valid_mmap_phys_addr_range(vma->vm_pgoff, size))
+ return -EINVAL;
+
+ prot = phys_mem_access_prot(NULL, vma->vm_pgoff, size,
+ vma->vm_page_prot);
+
/*
- * Leave vm_pgoff as-is, the PCI space address is the physical
- * address on this platform.
+ * If the user requested WC, the kernel uses UC or WC for this region,
+ * and the chipset supports WC, we can use WC. Otherwise, we have to
+ * use the same attribute the kernel uses.
*/
- if (write_combine && efi_range_is_wc(vma->vm_start,
- vma->vm_end - vma->vm_start))
+ if (write_combine &&
+ ((pgprot_val(prot) & _PAGE_MA_MASK) == _PAGE_MA_UC ||
+ (pgprot_val(prot) & _PAGE_MA_MASK) == _PAGE_MA_WC) &&
+ efi_range_is_wc(vma->vm_start, vma->vm_end - vma->vm_start))
vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
else
- vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
+ vma->vm_page_prot = prot;
if (remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff,
vma->vm_end - vma->vm_start, vma->vm_page_prot))