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authorTony Luck <tony.luck@intel.com>2006-06-21 14:50:10 -0700
committerTony Luck <tony.luck@intel.com>2006-06-21 14:50:10 -0700
commit1323523f505606cfd24af6122369afddefc3b09d (patch)
treea3238a27220dd91ec0918478683e59e48605865f /arch/ia64/pci/pci.c
parent9ba89334552b96e2127dcafb1c46ce255ecf2667 (diff)
parent32e62c636a728cb39c0b3bd191286f2ca65d4028 (diff)
Pull rework-memory-attribute-aliasing into release branch
Diffstat (limited to 'arch/ia64/pci/pci.c')
-rw-r--r--arch/ia64/pci/pci.c17
1 files changed, 15 insertions, 2 deletions
diff --git a/arch/ia64/pci/pci.c b/arch/ia64/pci/pci.c
index ab829a22f8a..30d148f3404 100644
--- a/arch/ia64/pci/pci.c
+++ b/arch/ia64/pci/pci.c
@@ -645,18 +645,31 @@ char *ia64_pci_get_legacy_mem(struct pci_bus *bus)
int
pci_mmap_legacy_page_range(struct pci_bus *bus, struct vm_area_struct *vma)
{
+ unsigned long size = vma->vm_end - vma->vm_start;
+ pgprot_t prot;
char *addr;
+ /*
+ * Avoid attribute aliasing. See Documentation/ia64/aliasing.txt
+ * for more details.
+ */
+ if (!valid_mmap_phys_addr_range(vma->vm_pgoff << PAGE_SHIFT, size))
+ return -EINVAL;
+ prot = phys_mem_access_prot(NULL, vma->vm_pgoff, size,
+ vma->vm_page_prot);
+ if (pgprot_val(prot) != pgprot_val(pgprot_noncached(vma->vm_page_prot)))
+ return -EINVAL;
+
addr = pci_get_legacy_mem(bus);
if (IS_ERR(addr))
return PTR_ERR(addr);
vma->vm_pgoff += (unsigned long)addr >> PAGE_SHIFT;
- vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
+ vma->vm_page_prot = prot;
vma->vm_flags |= (VM_SHM | VM_RESERVED | VM_IO);
if (remap_pfn_range(vma, vma->vm_start, vma->vm_pgoff,
- vma->vm_end - vma->vm_start, vma->vm_page_prot))
+ size, vma->vm_page_prot))
return -EAGAIN;
return 0;