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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>
This commit is contained in:
Joerg Roedel 2015-09-23 19:00:10 +02:00
parent 9ffecb1028
commit d66ce54b46
1 changed files with 22 additions and 20 deletions
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42
drivers/iommu/intel-iommu.c
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@ -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,
unsigned long long start,
unsigned long long end)
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);
return iommu_domain_identity_map(domain, start, end);
}
static int iommu_prepare_identity_map(struct device *dev,
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;
ret = domain_prepare_identity_map(dev, domain, start, end);
if (ret)
goto error;
domain_exit(domain);
return 0;
error:
domain_exit(domain);
return ret;
}