1 /* Glue code to lib/swiotlb-xen.c */
3 #include <linux/dma-mapping.h>
4 #include <xen/swiotlb-xen.h>
6 #include <asm/xen/hypervisor.h>
9 int xen_swiotlb __read_mostly;
11 static struct dma_map_ops xen_swiotlb_dma_ops = {
12 .mapping_error = xen_swiotlb_dma_mapping_error,
13 .alloc_coherent = xen_swiotlb_alloc_coherent,
14 .free_coherent = xen_swiotlb_free_coherent,
15 .sync_single_for_cpu = xen_swiotlb_sync_single_for_cpu,
16 .sync_single_for_device = xen_swiotlb_sync_single_for_device,
17 .sync_sg_for_cpu = xen_swiotlb_sync_sg_for_cpu,
18 .sync_sg_for_device = xen_swiotlb_sync_sg_for_device,
19 .map_sg = xen_swiotlb_map_sg_attrs,
20 .unmap_sg = xen_swiotlb_unmap_sg_attrs,
21 .map_page = xen_swiotlb_map_page,
22 .unmap_page = xen_swiotlb_unmap_page,
23 .dma_supported = xen_swiotlb_dma_supported,
27 * pci_xen_swiotlb_detect - set xen_swiotlb to 1 if necessary
29 * This returns non-zero if we are forced to use xen_swiotlb (by the boot
32 int __init pci_xen_swiotlb_detect(void)
35 /* If running as PV guest, either iommu=soft, or swiotlb=force will
36 * activate this IOMMU. If running as PV privileged, activate it
39 if ((xen_initial_domain() || swiotlb || swiotlb_force) &&
43 /* If we are running under Xen, we MUST disable the native SWIOTLB.
44 * Don't worry about swiotlb_force flag activating the native, as
45 * the 'swiotlb' flag is the only one turning it on. */
52 void __init pci_xen_swiotlb_init(void)
56 dma_ops = &xen_swiotlb_dma_ops;