Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc-2.6

* git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc-2.6:
  [SPARC64]: Temporarily remove IOMMU merging code.
  [SPARC64]: Update defconfig.
  [SPARC]: Add new timerfd syscall entries.

1 files changed, 26 insertions, 0 deletions

diff --git a/arch/sparc64/kernel/iommu_common.h b/arch/sparc64/kernel/iommu_common.h
index a90d046e802..4b5cafa2877 100644
--- a/arch/sparc64/kernel/iommu_common.h
+++ b/arch/sparc64/kernel/iommu_common.h
@@ -30,6 +30,32 @@
  */
 #define IOMMU_PAGE_SHIFT		13
 
+#define SG_ENT_PHYS_ADDRESS(SG)	(__pa(sg_virt((SG))))
+
+static inline unsigned long iommu_num_pages(unsigned long vaddr,
+					    unsigned long slen)
+{
+	unsigned long npages;
+
+	npages = IO_PAGE_ALIGN(vaddr + slen) - (vaddr & IO_PAGE_MASK);
+	npages >>= IO_PAGE_SHIFT;
+
+	return npages;
+}
+
+static inline unsigned long calc_npages(struct scatterlist *sglist, int nelems)
+{
+	unsigned long i, npages = 0;
+	struct scatterlist *sg;
+
+	for_each_sg(sglist, sg, nelems, i) {
+		unsigned long paddr = SG_ENT_PHYS_ADDRESS(sg);
+		npages += iommu_num_pages(paddr, sg->length);
+	}
+
+	return npages;
+}
+
 /* You are _strongly_ advised to enable the following debugging code
  * any time you make changes to the sg code below, run it for a while
  * with filesystems mounted read-only before buying the farm... -DaveM