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iommu/vt-d: Simplify domain_context_mapping_one 

Get rid of the special cases for VM domains vs. non-VM
domains and simplify the code further to just handle the
hardware passthrough vs. page-table case.

Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Joerg Roedel 2015-07-21 14:53:04 +02:00
parent 28ccce0d95
commit de24e55395
1 changed files with 26 additions and 34 deletions
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60
drivers/iommu/intel-iommu.c
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@ -1942,52 +1942,44 @@ static int domain_context_mapping_one(struct dmar_domain *domain,
return 0;
}
context_clear_entry(context);
id = domain->id;
pgd = domain->pgd;
if (domain_type_is_vm_or_si(domain)) {
if (domain_type_is_vm(domain)) {
id = __iommu_attach_domain(domain, iommu);
if (id < 0) {
spin_unlock_irqrestore(&iommu->lock, flags);
pr_err("%s: No free domain ids\n", iommu->name);
return -EFAULT;
}
}
/* Skip top levels of page tables for
* iommu which has less agaw than default.
* Unnecessary for PT mode.
*/
if (translation != CONTEXT_TT_PASS_THROUGH) {
for (agaw = domain->agaw; agaw != iommu->agaw; agaw--) {
pgd = phys_to_virt(dma_pte_addr(pgd));
if (!dma_pte_present(pgd)) {
spin_unlock_irqrestore(&iommu->lock, flags);
return -ENOMEM;
}
}
}
id = __iommu_attach_domain(domain, iommu);
if (id < 0) {
spin_unlock_irqrestore(&iommu->lock, flags);
pr_err("%s: No free domain ids\n", iommu->name);
return -EFAULT;
}
context_clear_entry(context);
context_set_domain_id(context, id);
/*
* Skip top levels of page tables for iommu which has less agaw
* than default. Unnecessary for PT mode.
*/
if (translation != CONTEXT_TT_PASS_THROUGH) {
for (agaw = domain->agaw; agaw != iommu->agaw; agaw--) {
pgd = phys_to_virt(dma_pte_addr(pgd));
if (!dma_pte_present(pgd)) {
spin_unlock_irqrestore(&iommu->lock, flags);
return -ENOMEM;
}
}
info = iommu_support_dev_iotlb(domain, iommu, bus, devfn);
translation = info ? CONTEXT_TT_DEV_IOTLB :
CONTEXT_TT_MULTI_LEVEL;
}
/*
* In pass through mode, AW must be programmed to indicate the largest
* AGAW value supported by hardware. And ASR is ignored by hardware.
*/
if (unlikely(translation == CONTEXT_TT_PASS_THROUGH))
context_set_address_width(context, iommu->msagaw);
else {
context_set_address_root(context, virt_to_phys(pgd));
context_set_address_width(context, iommu->agaw);
} else {
/*
* In pass through mode, AW must be programmed to
* indicate the largest AGAW value supported by
* hardware. And ASR is ignored by hardware.
*/
context_set_address_width(context, iommu->msagaw);
}
context_set_translation_type(context, translation);