x86_64: prepare shared kernel/pci-nommu.c

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 0 insertions, 97 deletions

diff --git a/arch/x86_64/kernel/pci-nommu.c b/arch/x86_64/kernel/pci-nommu.c
deleted file mode 100644
index 2a34c6c025a..00000000000
--- a/arch/x86_64/kernel/pci-nommu.c
+++ /dev/null
@@ -1,97 +0,0 @@
-/* Fallback functions when the main IOMMU code is not compiled in. This
-   code is roughly equivalent to i386. */
-#include <linux/mm.h>
-#include <linux/init.h>
-#include <linux/pci.h>
-#include <linux/string.h>
-#include <linux/dma-mapping.h>
-
-#include <asm/iommu.h>
-#include <asm/processor.h>
-#include <asm/dma.h>
-
-static int
-check_addr(char *name, struct device *hwdev, dma_addr_t bus, size_t size)
-{
-        if (hwdev && bus + size > *hwdev->dma_mask) {
-		if (*hwdev->dma_mask >= DMA_32BIT_MASK)
-			printk(KERN_ERR
-			    "nommu_%s: overflow %Lx+%zu of device mask %Lx\n",
-				name, (long long)bus, size,
-				(long long)*hwdev->dma_mask);
-		return 0;
-	}
-	return 1;
-}
-
-static dma_addr_t
-nommu_map_single(struct device *hwdev, void *ptr, size_t size,
-	       int direction)
-{
-	dma_addr_t bus = virt_to_bus(ptr);
-	if (!check_addr("map_single", hwdev, bus, size))
-				return bad_dma_address;
-	return bus;
-}
-
-static void nommu_unmap_single(struct device *dev, dma_addr_t addr,size_t size,
-			int direction)
-{
-}
-
-/* Map a set of buffers described by scatterlist in streaming
- * mode for DMA.  This is the scatter-gather version of the
- * above pci_map_single interface.  Here the scatter gather list
- * elements are each tagged with the appropriate dma address
- * and length.  They are obtained via sg_dma_{address,length}(SG).
- *
- * NOTE: An implementation may be able to use a smaller number of
- *       DMA address/length pairs than there are SG table elements.
- *       (for example via virtual mapping capabilities)
- *       The routine returns the number of addr/length pairs actually
- *       used, at most nents.
- *
- * Device ownership issues as mentioned above for pci_map_single are
- * the same here.
- */
-static int nommu_map_sg(struct device *hwdev, struct scatterlist *sg,
-	       int nents, int direction)
-{
-	int i;
-
- 	for (i = 0; i < nents; i++ ) {
-		struct scatterlist *s = &sg[i];
-		BUG_ON(!s->page);
-		s->dma_address = virt_to_bus(page_address(s->page) +s->offset);
-		if (!check_addr("map_sg", hwdev, s->dma_address, s->length))
-			return 0;
-		s->dma_length = s->length;
-	}
-	return nents;
-}
-
-/* Unmap a set of streaming mode DMA translations.
- * Again, cpu read rules concerning calls here are the same as for
- * pci_unmap_single() above.
- */
-static void nommu_unmap_sg(struct device *dev, struct scatterlist *sg,
-		  int nents, int dir)
-{
-}
-
-const struct dma_mapping_ops nommu_dma_ops = {
-	.map_single = nommu_map_single,
-	.unmap_single = nommu_unmap_single,
-	.map_sg = nommu_map_sg,
-	.unmap_sg = nommu_unmap_sg,
-	.is_phys = 1,
-};
-
-void __init no_iommu_init(void)
-{
-	if (dma_ops)
-		return;
-
-	force_iommu = 0; /* no HW IOMMU */
-	dma_ops = &nommu_dma_ops;
-}