Merge branch 'for-linus' of git://git.kernel.dk/linux-2.6-block

[linux-2.6] / arch / sparc64 / kernel / iommu_common.h

diff --git a/arch/sparc64/kernel/iommu_common.h b/arch/sparc64/kernel/iommu_common.h
index a90d046e8024fd1eb7667d478f2a9f6fd16e245e..0713bd58499c1de49d2650877c60f59437b66fd3 100644 (file)
--- a/arch/sparc64/kernel/iommu_common.h
+++ b/arch/sparc64/kernel/iommu_common.h
@@ -1,9 +1,11 @@
-/* $Id: iommu_common.h,v 1.5 2001/12/11 09:41:01 davem Exp $
- * iommu_common.h: UltraSparc SBUS/PCI common iommu declarations.
+/* iommu_common.h: UltraSparc SBUS/PCI common iommu declarations.
  *
- * Copyright (C) 1999 David S. Miller (davem@redhat.com)
+ * Copyright (C) 1999, 2008 David S. Miller (davem@davemloft.net)
  */
 
+#ifndef _IOMMU_COMMON_H
+#define _IOMMU_COMMON_H
+
 #include <linux/kernel.h>
 #include <linux/types.h>
 #include <linux/sched.h>
@@ -30,21 +32,38 @@
  */
 #define IOMMU_PAGE_SHIFT               13
 
-/* 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
- */
-#undef VERIFY_SG
+#define SG_ENT_PHYS_ADDRESS(SG)        (__pa(sg_virt((SG))))
 
-#ifdef VERIFY_SG
-extern void verify_sglist(struct scatterlist *sg, int nents, iopte_t *iopte, int npages);
-#endif
+static inline unsigned long iommu_num_pages(unsigned long vaddr,
+                                           unsigned long slen)
+{
+       unsigned long npages;
 
-/* Two addresses are "virtually contiguous" if and only if:
- * 1) They are equal, or...
- * 2) They are both on a page boundary
- */
-#define VCONTIG(__X, __Y)      (((__X) == (__Y)) || \
-                                (((__X) | (__Y)) << (64UL - PAGE_SHIFT)) == 0UL)
+       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;
+}
+
+extern unsigned long iommu_range_alloc(struct device *dev,
+                                      struct iommu *iommu,
+                                      unsigned long npages,
+                                      unsigned long *handle);
+extern void iommu_range_free(struct iommu *iommu,
+                            dma_addr_t dma_addr,
+                            unsigned long npages);
 
-extern unsigned long prepare_sg(struct device *dev, struct scatterlist *sg, int nents);
+#endif /* _IOMMU_COMMON_H */