diff options
| author | FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> | 2008-07-29 13:38:53 +0900 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-07-29 12:12:48 +0200 |
| commit | 8978b74253280d59e97cf49a3ec2c0cbccd5b801 (patch) | |
| tree | 7cecd6951437f01f541178c1afc14d4e1d2e2b23 /arch/x86/kernel/pci-dma.c | |
| parent | 35780c8ea7ad5c6d5483244d5f5bf37176fda86a (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.c | 8 |
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 /* |