Commit | Line | Data |
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bbbe5738 KRW |
1 | /* Glue code to lib/swiotlb-xen.c */ |
2 | ||
3 | #include <linux/dma-mapping.h> | |
4 | #include <xen/swiotlb-xen.h> | |
5 | ||
6 | #include <asm/xen/hypervisor.h> | |
7 | #include <xen/xen.h> | |
8 | ||
9 | int xen_swiotlb __read_mostly; | |
10 | ||
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, | |
24 | }; | |
25 | ||
26 | /* | |
27 | * pci_xen_swiotlb_detect - set xen_swiotlb to 1 if necessary | |
28 | * | |
29 | * This returns non-zero if we are forced to use xen_swiotlb (by the boot | |
30 | * option). | |
31 | */ | |
32 | int __init pci_xen_swiotlb_detect(void) | |
33 | { | |
34 | ||
35 | /* If running as PV guest, either iommu=soft, or swiotlb=force will | |
36 | * activate this IOMMU. If running as PV privileged, activate it | |
37 | * irregardlesss. | |
38 | */ | |
39 | if ((xen_initial_domain() || swiotlb || swiotlb_force) && | |
40 | (xen_pv_domain())) | |
41 | xen_swiotlb = 1; | |
42 | ||
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. */ | |
46 | if (xen_pv_domain()) | |
47 | swiotlb = 0; | |
48 | ||
49 | return xen_swiotlb; | |
50 | } | |
51 | ||
52 | void __init pci_xen_swiotlb_init(void) | |
53 | { | |
54 | if (xen_swiotlb) { | |
55 | xen_swiotlb_init(1); | |
56 | dma_ops = &xen_swiotlb_dma_ops; | |
57 | } | |
58 | } |