summaryrefslogtreecommitdiffstats
path: root/arch/x86/kernel/pci-dma.c
diff options
context:
space:
mode:
authorFUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>2008-07-29 13:38:53 +0900
committerIngo Molnar <mingo@elte.hu>2008-07-29 12:12:48 +0200
commit8978b74253280d59e97cf49a3ec2c0cbccd5b801 (patch)
tree7cecd6951437f01f541178c1afc14d4e1d2e2b23 /arch/x86/kernel/pci-dma.c
parent35780c8ea7ad5c6d5483244d5f5bf37176fda86a (diff)
generic, x86: fix add iommu_num_pages helper function
This IOMMU helper function doesn't work for some architectures: http://marc.info/?l=linux-kernel&m=121699304403202&w=2 It also breaks POWER and SPARC builds: http://marc.info/?l=linux-kernel&m=121730388001890&w=2 Currently, only x86 IOMMUs use this so let's move it to x86 for now. Reported-by: Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Signed-off-by: Ingo Molnar <mingo@elte.hu>
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
/*