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Commit d66ce54b authored by Joerg Roedel's avatar Joerg Roedel
Browse files

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: default avatarJoerg Roedel <jroedel@suse.de>
parent 9ffecb10

drivers/iommu/intel-iommu.c

+22 −20
Original line number Diff line number Diff line
@@ -2429,17 +2429,11 @@ static int iommu_domain_identity_map(struct dmar_domain *domain, 
				  DMA_PTE_READ|DMA_PTE_WRITE);

}



static int iommu_prepare_identity_map(struct device *dev,

static int domain_prepare_identity_map(struct device *dev,

				       struct dmar_domain *domain,

				       unsigned long long start,

				       unsigned long long end)

{

	struct dmar_domain *domain;

	int ret;



	domain = get_domain_for_dev(dev, DEFAULT_DOMAIN_ADDRESS_WIDTH);

	if (!domain)

		return -ENOMEM;



	/* For _hardware_ passthrough, don't bother. But for software

	   passthrough, we do it anyway -- it may indicate a memory

	   range which is reserved in E820, so which didn't get set
@@ -2459,8 +2453,7 @@ static int iommu_prepare_identity_map(struct device *dev, 
			dmi_get_system_info(DMI_BIOS_VENDOR),

			dmi_get_system_info(DMI_BIOS_VERSION),

		     dmi_get_system_info(DMI_PRODUCT_VERSION));

		ret = -EIO;

		goto error;

		return -EIO;

	}



	if (end >> agaw_to_width(domain->agaw)) {
@@ -2470,18 +2463,27 @@ static int iommu_prepare_identity_map(struct device *dev, 
		     dmi_get_system_info(DMI_BIOS_VENDOR),

		     dmi_get_system_info(DMI_BIOS_VERSION),

		     dmi_get_system_info(DMI_PRODUCT_VERSION));

		ret = -EIO;

		goto error;

		return -EIO;

	}



	ret = iommu_domain_identity_map(domain, start, end);

	if (ret)

		goto error;

	return iommu_domain_identity_map(domain, start, end);

}



	return 0;

static int iommu_prepare_identity_map(struct device *dev,

				      unsigned long long start,

				      unsigned long long end)

{

	struct dmar_domain *domain;

	int ret;



 error:

	domain = get_domain_for_dev(dev, DEFAULT_DOMAIN_ADDRESS_WIDTH);

	if (!domain)

		return -ENOMEM;



	ret = domain_prepare_identity_map(dev, domain, start, end);

	if (ret)

		domain_exit(domain);



	return ret;

}