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 | 10 | |
a5f95155 | 11 | |
b8b0f559 | 12 | #include <asm/xen/swiotlb-xen.h> |
fc2341df KRW |
13 | #ifdef CONFIG_X86_64 |
14 | #include <asm/iommu.h> | |
15 | #include <asm/dma.h> | |
16 | #endif | |
b8277600 | 17 | #include <linux/export.h> |
a5f95155 | 18 | |
bbbe5738 KRW |
19 | int xen_swiotlb __read_mostly; |
20 | ||
21 | static struct dma_map_ops xen_swiotlb_dma_ops = { | |
22 | .mapping_error = xen_swiotlb_dma_mapping_error, | |
baa676fc AP |
23 | .alloc = xen_swiotlb_alloc_coherent, |
24 | .free = xen_swiotlb_free_coherent, | |
bbbe5738 KRW |
25 | .sync_single_for_cpu = xen_swiotlb_sync_single_for_cpu, |
26 | .sync_single_for_device = xen_swiotlb_sync_single_for_device, | |
27 | .sync_sg_for_cpu = xen_swiotlb_sync_sg_for_cpu, | |
28 | .sync_sg_for_device = xen_swiotlb_sync_sg_for_device, | |
29 | .map_sg = xen_swiotlb_map_sg_attrs, | |
30 | .unmap_sg = xen_swiotlb_unmap_sg_attrs, | |
31 | .map_page = xen_swiotlb_map_page, | |
32 | .unmap_page = xen_swiotlb_unmap_page, | |
33 | .dma_supported = xen_swiotlb_dma_supported, | |
34 | }; | |
35 | ||
36 | /* | |
37 | * pci_xen_swiotlb_detect - set xen_swiotlb to 1 if necessary | |
38 | * | |
39 | * This returns non-zero if we are forced to use xen_swiotlb (by the boot | |
40 | * option). | |
41 | */ | |
42 | int __init pci_xen_swiotlb_detect(void) | |
43 | { | |
44 | ||
988f0e24 KRW |
45 | if (!xen_pv_domain()) |
46 | return 0; | |
47 | ||
bbbe5738 KRW |
48 | /* If running as PV guest, either iommu=soft, or swiotlb=force will |
49 | * activate this IOMMU. If running as PV privileged, activate it | |
70f23fd6 | 50 | * irregardless. |
bbbe5738 | 51 | */ |
988f0e24 | 52 | if ((xen_initial_domain() || swiotlb || swiotlb_force)) |
bbbe5738 KRW |
53 | xen_swiotlb = 1; |
54 | ||
55 | /* If we are running under Xen, we MUST disable the native SWIOTLB. | |
56 | * Don't worry about swiotlb_force flag activating the native, as | |
57 | * the 'swiotlb' flag is the only one turning it on. */ | |
988f0e24 | 58 | swiotlb = 0; |
bbbe5738 | 59 | |
fc2341df KRW |
60 | #ifdef CONFIG_X86_64 |
61 | /* pci_swiotlb_detect_4gb turns on native SWIOTLB if no_iommu == 0 | |
62 | * (so no iommu=X command line over-writes). | |
63 | * Considering that PV guests do not want the *native SWIOTLB* but | |
64 | * only Xen SWIOTLB it is not useful to us so set no_iommu=1 here. | |
65 | */ | |
66 | if (max_pfn > MAX_DMA32_PFN) | |
67 | no_iommu = 1; | |
68 | #endif | |
bbbe5738 KRW |
69 | return xen_swiotlb; |
70 | } | |
71 | ||
72 | void __init pci_xen_swiotlb_init(void) | |
73 | { | |
74 | if (xen_swiotlb) { | |
b8277600 | 75 | xen_swiotlb_init(1, true /* early */); |
bbbe5738 | 76 | dma_ops = &xen_swiotlb_dma_ops; |
74226b8c | 77 | |
92c0fd17 | 78 | #ifdef CONFIG_PCI |
74226b8c KRW |
79 | /* Make sure ACS will be enabled */ |
80 | pci_request_acs(); | |
92c0fd17 | 81 | #endif |
bbbe5738 KRW |
82 | } |
83 | } | |
b8277600 KRW |
84 | |
85 | int pci_xen_swiotlb_init_late(void) | |
86 | { | |
87 | int rc; | |
88 | ||
89 | if (xen_swiotlb) | |
90 | return 0; | |
91 | ||
92 | rc = xen_swiotlb_init(1, false /* late */); | |
93 | if (rc) | |
94 | return rc; | |
95 | ||
96 | dma_ops = &xen_swiotlb_dma_ops; | |
92c0fd17 | 97 | #ifdef CONFIG_PCI |
b8277600 KRW |
98 | /* Make sure ACS will be enabled */ |
99 | pci_request_acs(); | |
92c0fd17 | 100 | #endif |
b8277600 KRW |
101 | |
102 | return 0; | |
103 | } | |
104 | EXPORT_SYMBOL_GPL(pci_xen_swiotlb_init_late); | |
105 | ||
5cb3a267 | 106 | IOMMU_INIT_FINISH(pci_xen_swiotlb_detect, |
6d7083ee | 107 | NULL, |
5cb3a267 | 108 | pci_xen_swiotlb_init, |
6d7083ee | 109 | NULL); |