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-rw-r--r--arch/x86/kernel/pci-swiotlb_64.c44
1 files changed, 44 insertions, 0 deletions
diff --git a/arch/x86/kernel/pci-swiotlb_64.c b/arch/x86/kernel/pci-swiotlb_64.c
new file mode 100644
index 000000000000..b2f405ea7c85
--- /dev/null
+++ b/arch/x86/kernel/pci-swiotlb_64.c
@@ -0,0 +1,44 @@
1/* Glue code to lib/swiotlb.c */
2
3#include <linux/pci.h>
4#include <linux/cache.h>
5#include <linux/module.h>
6#include <linux/dma-mapping.h>
7
8#include <asm/iommu.h>
9#include <asm/swiotlb.h>
10#include <asm/dma.h>
11
12int swiotlb __read_mostly;
13EXPORT_SYMBOL(swiotlb);
14
15const struct dma_mapping_ops swiotlb_dma_ops = {
16 .mapping_error = swiotlb_dma_mapping_error,
17 .alloc_coherent = swiotlb_alloc_coherent,
18 .free_coherent = swiotlb_free_coherent,
19 .map_single = swiotlb_map_single,
20 .unmap_single = swiotlb_unmap_single,
21 .sync_single_for_cpu = swiotlb_sync_single_for_cpu,
22 .sync_single_for_device = swiotlb_sync_single_for_device,
23 .sync_single_range_for_cpu = swiotlb_sync_single_range_for_cpu,
24 .sync_single_range_for_device = swiotlb_sync_single_range_for_device,
25 .sync_sg_for_cpu = swiotlb_sync_sg_for_cpu,
26 .sync_sg_for_device = swiotlb_sync_sg_for_device,
27 .map_sg = swiotlb_map_sg,
28 .unmap_sg = swiotlb_unmap_sg,
29 .dma_supported = NULL,
30};
31
32void __init pci_swiotlb_init(void)
33{
34 /* don't initialize swiotlb if iommu=off (no_iommu=1) */
35 if (!iommu_detected && !no_iommu && end_pfn > MAX_DMA32_PFN)
36 swiotlb = 1;
37 if (swiotlb_force)
38 swiotlb = 1;
39 if (swiotlb) {
40 printk(KERN_INFO "PCI-DMA: Using software bounce buffering for IO (SWIOTLB)\n");
41 swiotlb_init();
42 dma_ops = &swiotlb_dma_ops;
43 }
44}