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iommu/vt-d: Add attach_deferred() helper

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Implement a helper function to check whether a device's attach process
is deferred.

Fixes: 1ee0186b9a ("iommu/vt-d: Refactor find_domain() helper")
Cc: stable@vger.kernel.org # v5.5
Reviewed-by: Jerry Snitselaar <jsnitsel@redhat.com>
Acked-by: Lu Baolu <baolu.lu@linux.intel.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Joerg Roedel 2020-02-17 17:12:37 +01:00
parent e7598fac32
commit 1d4615978f
1 changed files with 8 additions and 4 deletions
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12
drivers/iommu/intel-iommu.c
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@ -762,6 +762,11 @@ static int iommu_dummy(struct device *dev)
return dev->archdata.iommu == DUMMY_DEVICE_DOMAIN_INFO;
}
static bool attach_deferred(struct device *dev)
{
return dev->archdata.iommu == DEFER_DEVICE_DOMAIN_INFO;
}
/**
* is_downstream_to_pci_bridge - test if a device belongs to the PCI
* sub-hierarchy of a candidate PCI-PCI bridge
@ -2510,8 +2515,7 @@ struct dmar_domain *find_domain(struct device *dev)
{
struct device_domain_info *info;
if (unlikely(dev->archdata.iommu == DEFER_DEVICE_DOMAIN_INFO ||
dev->archdata.iommu == DUMMY_DEVICE_DOMAIN_INFO))
if (unlikely(attach_deferred(dev) || iommu_dummy(dev)))
return NULL;
if (dev_is_pci(dev))
@ -2527,7 +2531,7 @@ struct dmar_domain *find_domain(struct device *dev)
static struct dmar_domain *deferred_attach_domain(struct device *dev)
{
if (unlikely(dev->archdata.iommu == DEFER_DEVICE_DOMAIN_INFO)) {
if (unlikely(attach_deferred(dev))) {
struct iommu_domain *domain;
dev->archdata.iommu = NULL;
@ -6133,7 +6137,7 @@ intel_iommu_aux_get_pasid(struct iommu_domain *domain, struct device *dev)
static bool intel_iommu_is_attach_deferred(struct iommu_domain *domain,
struct device *dev)
{
return dev->archdata.iommu == DEFER_DEVICE_DOMAIN_INFO;
return attach_deferred(dev);
}
static int