projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 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 | ||
| bbbe5738 KRW |
21 | /* |
| 22 | * pci_xen_swiotlb_detect - set xen_swiotlb to 1 if necessary | |
| 23 | * | |
| 24 | * This returns non-zero if we are forced to use xen_swiotlb (by the boot | |
| 25 | * option). | |
| 26 | */ | |
| 27 | int __init pci_xen_swiotlb_detect(void) | |
| 28 | { | |
| 29 | ||
| 988f0e24 KRW |
30 | if (!xen_pv_domain()) |
| 31 | return 0; | |
| 32 | ||
| bbbe5738 KRW |
33 | /* If running as PV guest, either iommu=soft, or swiotlb=force will |
| 34 | * activate this IOMMU. If running as PV privileged, activate it | |
| 70f23fd6 | 35 | * irregardless. |
| bbbe5738 | 36 | */ |
| ae7871be | 37 | if (xen_initial_domain() || swiotlb || swiotlb_force == SWIOTLB_FORCE) |
| bbbe5738 KRW |
38 | xen_swiotlb = 1; |
| 39 | ||
| 40 | /* If we are running under Xen, we MUST disable the native SWIOTLB. | |
| 41 | * Don't worry about swiotlb_force flag activating the native, as | |
| 42 | * the 'swiotlb' flag is the only one turning it on. */ | |
| 988f0e24 | 43 | swiotlb = 0; |
| bbbe5738 | 44 | |
| fc2341df KRW |
45 | #ifdef CONFIG_X86_64 |
| 46 | /* pci_swiotlb_detect_4gb turns on native SWIOTLB if no_iommu == 0 | |
| 47 | * (so no iommu=X command line over-writes). | |
| 48 | * Considering that PV guests do not want the *native SWIOTLB* but | |
| 49 | * only Xen SWIOTLB it is not useful to us so set no_iommu=1 here. | |
| 50 | */ | |
| 51 | if (max_pfn > MAX_DMA32_PFN) | |
| 52 | no_iommu = 1; | |
| 53 | #endif | |
| bbbe5738 KRW |
54 | return xen_swiotlb; |
| 55 | } | |
| 56 | ||
| 57 | void __init pci_xen_swiotlb_init(void) | |
| 58 | { | |
| 59 | if (xen_swiotlb) { | |
| b8277600 | 60 | xen_swiotlb_init(1, true /* early */); |
| bbbe5738 | 61 | dma_ops = &xen_swiotlb_dma_ops; |
| 74226b8c | 62 | |
| 92c0fd17 | 63 | #ifdef CONFIG_PCI |
| 74226b8c KRW |
64 | /* Make sure ACS will be enabled */ |
| 65 | pci_request_acs(); | |
| 92c0fd17 | 66 | #endif |
| bbbe5738 KRW |
67 | } |
| 68 | } | |
| b8277600 KRW |
69 | |
| 70 | int pci_xen_swiotlb_init_late(void) | |
| 71 | { | |
| 72 | int rc; | |
| 73 | ||
| 74 | if (xen_swiotlb) | |
| 75 | return 0; | |
| 76 | ||
| 77 | rc = xen_swiotlb_init(1, false /* late */); | |
| 78 | if (rc) | |
| 79 | return rc; | |
| 80 | ||
| 81 | dma_ops = &xen_swiotlb_dma_ops; | |
| 92c0fd17 | 82 | #ifdef CONFIG_PCI |
| b8277600 KRW |
83 | /* Make sure ACS will be enabled */ |
| 84 | pci_request_acs(); | |
| 92c0fd17 | 85 | #endif |
| b8277600 KRW |
86 | |
| 87 | return 0; | |
| 88 | } | |
| 89 | EXPORT_SYMBOL_GPL(pci_xen_swiotlb_init_late); | |
| 90 | ||
| 5cb3a267 | 91 | IOMMU_INIT_FINISH(pci_xen_swiotlb_detect, |
| 6d7083ee | 92 | NULL, |
| 5cb3a267 | 93 | pci_xen_swiotlb_init, |
| 6d7083ee | 94 | NULL); |