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96 lines
2.0 KiB
96 lines
2.0 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* Glue code to lib/swiotlb-xen.c */ |
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#include <linux/dma-map-ops.h> |
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#include <linux/pci.h> |
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#include <xen/swiotlb-xen.h> |
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#include <asm/xen/hypervisor.h> |
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#include <xen/xen.h> |
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#include <asm/iommu_table.h> |
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#include <asm/xen/swiotlb-xen.h> |
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#ifdef CONFIG_X86_64 |
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#include <asm/iommu.h> |
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#include <asm/dma.h> |
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#endif |
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#include <linux/export.h> |
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static int xen_swiotlb __read_mostly; |
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/* |
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* pci_xen_swiotlb_detect - set xen_swiotlb to 1 if necessary |
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* |
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* This returns non-zero if we are forced to use xen_swiotlb (by the boot |
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* option). |
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*/ |
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int __init pci_xen_swiotlb_detect(void) |
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{ |
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if (!xen_pv_domain()) |
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return 0; |
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/* If running as PV guest, either iommu=soft, or swiotlb=force will |
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* activate this IOMMU. If running as PV privileged, activate it |
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* irregardless. |
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*/ |
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if (xen_initial_domain() || swiotlb || swiotlb_force == SWIOTLB_FORCE) |
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xen_swiotlb = 1; |
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/* If we are running under Xen, we MUST disable the native SWIOTLB. |
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* Don't worry about swiotlb_force flag activating the native, as |
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* the 'swiotlb' flag is the only one turning it on. */ |
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swiotlb = 0; |
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#ifdef CONFIG_X86_64 |
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/* pci_swiotlb_detect_4gb turns on native SWIOTLB if no_iommu == 0 |
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* (so no iommu=X command line over-writes). |
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* Considering that PV guests do not want the *native SWIOTLB* but |
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* only Xen SWIOTLB it is not useful to us so set no_iommu=1 here. |
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*/ |
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if (max_pfn > MAX_DMA32_PFN) |
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no_iommu = 1; |
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#endif |
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return xen_swiotlb; |
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} |
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static void __init pci_xen_swiotlb_init(void) |
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{ |
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if (xen_swiotlb) { |
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xen_swiotlb_init_early(); |
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dma_ops = &xen_swiotlb_dma_ops; |
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#ifdef CONFIG_PCI |
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/* Make sure ACS will be enabled */ |
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pci_request_acs(); |
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#endif |
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} |
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} |
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int pci_xen_swiotlb_init_late(void) |
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{ |
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int rc; |
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if (xen_swiotlb) |
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return 0; |
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rc = xen_swiotlb_init(); |
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if (rc) |
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return rc; |
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dma_ops = &xen_swiotlb_dma_ops; |
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#ifdef CONFIG_PCI |
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/* Make sure ACS will be enabled */ |
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pci_request_acs(); |
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#endif |
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return 0; |
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} |
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EXPORT_SYMBOL_GPL(pci_xen_swiotlb_init_late); |
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IOMMU_INIT_FINISH(pci_xen_swiotlb_detect, |
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NULL, |
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pci_xen_swiotlb_init, |
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NULL);
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