aboutsummaryrefslogtreecommitdiffstats
path: root/arch/x86/kernel/pci-dma.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/x86/kernel/pci-dma.c')
-rw-r--r--arch/x86/kernel/pci-dma.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/arch/x86/kernel/pci-dma.c b/arch/x86/kernel/pci-dma.c
index 8dbffb846de..87d4d6964ec 100644
--- a/arch/x86/kernel/pci-dma.c
+++ b/arch/x86/kernel/pci-dma.c
@@ -123,6 +123,14 @@ void __init pci_iommu_alloc(void)
pci_swiotlb_init();
}
+
+unsigned long iommu_num_pages(unsigned long addr, unsigned long len)
+{
+ unsigned long size = roundup((addr & ~PAGE_MASK) + len, PAGE_SIZE);
+
+ return size >> PAGE_SHIFT;
+}
+EXPORT_SYMBOL(iommu_num_pages);
#endif
/*