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authorLinus Torvalds <torvalds@linux-foundation.org>2008-07-28 18:14:24 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2008-07-28 18:14:24 -0700
commit1d9b9f6a53d77ed801ba875f937d6dabbfc381ce (patch)
tree36ea93b80a444c3b37111e352790ebc07f29379f /lib
parenta3ad7f128c637b7612ebeacb1f85fec933bb1195 (diff)
parent12c0b20fa4afb5c8a377d6987fb2dcf353e1dce1 (diff)
downloadconfigs-1d9b9f6a53d77ed801ba875f937d6dabbfc381ce.tar.gz
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jbarnes/pci-2.6
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jbarnes/pci-2.6: (21 commits) x86/PCI: use dev_printk when possible PCI: add D3 power state avoidance quirk PCI: fix bogus "'device' may be used uninitialized" warning in pci_slot PCI: add an option to allow ASPM enabled forcibly PCI: disable ASPM on pre-1.1 PCIe devices PCI: disable ASPM per ACPI FADT setting PCI MSI: Don't disable MSIs if the mask bit isn't supported PCI: handle 64-bit resources better on 32-bit machines PCI: rewrite PCI BAR reading code PCI: document pci_target_state PCI hotplug: fix typo in pcie hotplug output x86 gart: replace to_pages macro with iommu_num_pages x86, AMD IOMMU: replace to_pages macro with iommu_num_pages iommu: add iommu_num_pages helper function dma-coherent: add documentation to new interfaces Cris: convert to using generic dma-coherent mem allocator Sh: use generic per-device coherent dma allocator ARM: support generic per-device coherent dma mem Generic dma-coherent: fix DMA_MEMORY_EXCLUSIVE x86: use generic per-device dma coherent allocator ...
Diffstat (limited to 'lib')
-rw-r--r--lib/iommu-helper.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/lib/iommu-helper.c b/lib/iommu-helper.c
index a3b8d4c3f77..889ddce2021 100644
--- a/lib/iommu-helper.c
+++ b/lib/iommu-helper.c
@@ -80,3 +80,11 @@ void iommu_area_free(unsigned long *map, unsigned long start, unsigned int nr)
}
}
EXPORT_SYMBOL(iommu_area_free);
+
+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);