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authorThomas Gleixner <tglx@linutronix.de>2007-10-11 11:17:24 +0200
committerThomas Gleixner <tglx@linutronix.de>2007-10-11 11:17:24 +0200
commit250c22777fe1ccd7ac588579a6c16db4c0161cc5 (patch)
tree55c317efb7d792ec6fdae1d1937c67a502c48dec /arch/x86/kernel/pci-nommu_64.c
parent2db55d344e529492545cb3b755c7e9ba8e4fa94e (diff)
x86_64: move kernel
Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86/kernel/pci-nommu_64.c')
-rw-r--r--arch/x86/kernel/pci-nommu_64.c97
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 00000000000..2a34c6c025a
--- /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;
+}