1 files changed, 97 insertions, 0 deletions

diff --git a/arch/x86/kernel/pci-nommu_64.c b/arch/x86/kernel/pci-nommu_64.c
new file mode 100644
index 000000000000..2a34c6c025a9
--- /dev/null
+++ b/arch/x86/kernel/pci-nommu_64.c
@@ -0,0 +1,97 @@
+/* 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;
+}