Commit | Line | Data |
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bbbe5738 KRW |
1 | /* Glue code to lib/swiotlb-xen.c */ |
2 | ||
3 | #include <linux/dma-mapping.h> | |
74226b8c | 4 | #include <linux/pci.h> |
bbbe5738 KRW |
5 | #include <xen/swiotlb-xen.h> |
6 | ||
7 | #include <asm/xen/hypervisor.h> | |
8 | #include <xen/xen.h> | |
5cb3a267 | 9 | #include <asm/iommu_table.h> |
bbbe5738 KRW |
10 | |
11 | int xen_swiotlb __read_mostly; | |
12 | ||
13 | static struct dma_map_ops xen_swiotlb_dma_ops = { | |
14 | .mapping_error = xen_swiotlb_dma_mapping_error, | |
baa676fc AP |
15 | .alloc = xen_swiotlb_alloc_coherent, |
16 | .free = xen_swiotlb_free_coherent, | |
bbbe5738 KRW |
17 | .sync_single_for_cpu = xen_swiotlb_sync_single_for_cpu, |
18 | .sync_single_for_device = xen_swiotlb_sync_single_for_device, | |
19 | .sync_sg_for_cpu = xen_swiotlb_sync_sg_for_cpu, | |
20 | .sync_sg_for_device = xen_swiotlb_sync_sg_for_device, | |
21 | .map_sg = xen_swiotlb_map_sg_attrs, | |
22 | .unmap_sg = xen_swiotlb_unmap_sg_attrs, | |
23 | .map_page = xen_swiotlb_map_page, | |
24 | .unmap_page = xen_swiotlb_unmap_page, | |
25 | .dma_supported = xen_swiotlb_dma_supported, | |
26 | }; | |
27 | ||
28 | /* | |
29 | * pci_xen_swiotlb_detect - set xen_swiotlb to 1 if necessary | |
30 | * | |
31 | * This returns non-zero if we are forced to use xen_swiotlb (by the boot | |
32 | * option). | |
33 | */ | |
34 | int __init pci_xen_swiotlb_detect(void) | |
35 | { | |
36 | ||
988f0e24 KRW |
37 | if (!xen_pv_domain()) |
38 | return 0; | |
39 | ||
bbbe5738 KRW |
40 | /* If running as PV guest, either iommu=soft, or swiotlb=force will |
41 | * activate this IOMMU. If running as PV privileged, activate it | |
70f23fd6 | 42 | * irregardless. |
bbbe5738 | 43 | */ |
988f0e24 | 44 | if ((xen_initial_domain() || swiotlb || swiotlb_force)) |
bbbe5738 KRW |
45 | xen_swiotlb = 1; |
46 | ||
47 | /* If we are running under Xen, we MUST disable the native SWIOTLB. | |
48 | * Don't worry about swiotlb_force flag activating the native, as | |
49 | * the 'swiotlb' flag is the only one turning it on. */ | |
988f0e24 | 50 | swiotlb = 0; |
bbbe5738 KRW |
51 | |
52 | return xen_swiotlb; | |
53 | } | |
54 | ||
55 | void __init pci_xen_swiotlb_init(void) | |
56 | { | |
57 | if (xen_swiotlb) { | |
58 | xen_swiotlb_init(1); | |
59 | dma_ops = &xen_swiotlb_dma_ops; | |
74226b8c KRW |
60 | |
61 | /* Make sure ACS will be enabled */ | |
62 | pci_request_acs(); | |
bbbe5738 KRW |
63 | } |
64 | } | |
5cb3a267 KRW |
65 | IOMMU_INIT_FINISH(pci_xen_swiotlb_detect, |
66 | 0, | |
67 | pci_xen_swiotlb_init, | |
68 | 0); |