iommu/vt-d: Split iommu_prepare_identity_map
Split the part of the function that fetches the domain out and put the rest into into a domain_prepare_identity_map, so that the code can also be used with when the domain is already known. Signed-off-by: Joerg Roedel <jroedel@suse.de>
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@ -2429,17 +2429,11 @@ static int iommu_domain_identity_map(struct dmar_domain *domain,
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DMA_PTE_READ|DMA_PTE_WRITE);
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}
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static int iommu_prepare_identity_map(struct device *dev,
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static int domain_prepare_identity_map(struct device *dev,
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struct dmar_domain *domain,
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unsigned long long start,
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unsigned long long end)
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{
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struct dmar_domain *domain;
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int ret;
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domain = get_domain_for_dev(dev, DEFAULT_DOMAIN_ADDRESS_WIDTH);
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if (!domain)
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return -ENOMEM;
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/* For _hardware_ passthrough, don't bother. But for software
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passthrough, we do it anyway -- it may indicate a memory
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range which is reserved in E820, so which didn't get set
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@ -2459,8 +2453,7 @@ static int iommu_prepare_identity_map(struct device *dev,
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dmi_get_system_info(DMI_BIOS_VENDOR),
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dmi_get_system_info(DMI_BIOS_VERSION),
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dmi_get_system_info(DMI_PRODUCT_VERSION));
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ret = -EIO;
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goto error;
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return -EIO;
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}
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if (end >> agaw_to_width(domain->agaw)) {
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@ -2470,18 +2463,27 @@ static int iommu_prepare_identity_map(struct device *dev,
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dmi_get_system_info(DMI_BIOS_VENDOR),
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dmi_get_system_info(DMI_BIOS_VERSION),
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dmi_get_system_info(DMI_PRODUCT_VERSION));
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ret = -EIO;
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goto error;
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return -EIO;
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}
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ret = iommu_domain_identity_map(domain, start, end);
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return iommu_domain_identity_map(domain, start, end);
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}
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static int iommu_prepare_identity_map(struct device *dev,
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unsigned long long start,
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unsigned long long end)
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{
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struct dmar_domain *domain;
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int ret;
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domain = get_domain_for_dev(dev, DEFAULT_DOMAIN_ADDRESS_WIDTH);
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if (!domain)
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return -ENOMEM;
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ret = domain_prepare_identity_map(dev, domain, start, end);
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if (ret)
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goto error;
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return 0;
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error:
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domain_exit(domain);
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return ret;
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}
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