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authorJoerg Roedel <jroedel@suse.de>2016-08-25 15:25:12 +0300
committerJoerg Roedel <jroedel@suse.de>2016-09-05 14:00:28 +0300
commit76208356a0ab357a1fb9f43bedb7fd1046ad8ece (patch)
tree6b469fc7770e831ed032723c9935c2bdec47952c /drivers/iommu
parentc6935931c1894ff857616ff8549b61236a19148f (diff)
downloadlinux-76208356a0ab357a1fb9f43bedb7fd1046ad8ece.tar.xz
iommu/vt-d: Split up get_domain_for_dev function
Split out the search for an already existing domain and the context mapping of the device to the new domain. This allows to map possible RMRR regions into the domain before it is context mapped. Signed-off-by: Joerg Roedel <jroedel@suse.de>
Diffstat (limited to 'drivers/iommu')
-rw-r--r--drivers/iommu/intel-iommu.c76
1 files changed, 55 insertions, 21 deletions
diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index ebb5bf3ddbd9..bcdbe9de7560 100644
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -2452,20 +2452,15 @@ static int get_last_alias(struct pci_dev *pdev, u16 alias, void *opaque)
return 0;
}
-/* domain is initialized */
-static struct dmar_domain *get_domain_for_dev(struct device *dev, int gaw)
+static struct dmar_domain *find_or_alloc_domain(struct device *dev, int gaw)
{
struct device_domain_info *info = NULL;
- struct dmar_domain *domain, *tmp;
+ struct dmar_domain *domain = NULL;
struct intel_iommu *iommu;
u16 req_id, dma_alias;
unsigned long flags;
u8 bus, devfn;
- domain = find_domain(dev);
- if (domain)
- return domain;
-
iommu = device_to_iommu(dev, &bus, &devfn);
if (!iommu)
return NULL;
@@ -2487,9 +2482,9 @@ static struct dmar_domain *get_domain_for_dev(struct device *dev, int gaw)
}
spin_unlock_irqrestore(&device_domain_lock, flags);
- /* DMA alias already has a domain, uses it */
+ /* DMA alias already has a domain, use it */
if (info)
- goto found_domain;
+ goto out;
}
/* Allocate and initialize new domain for the device */
@@ -2501,28 +2496,67 @@ static struct dmar_domain *get_domain_for_dev(struct device *dev, int gaw)
return NULL;
}
- /* register PCI DMA alias device */
- if (dev_is_pci(dev) && req_id != dma_alias) {
- tmp = dmar_insert_one_dev_info(iommu, PCI_BUS_NUM(dma_alias),
- dma_alias & 0xff, NULL, domain);
+out:
- if (!tmp || tmp != domain) {
- domain_exit(domain);
- domain = tmp;
- }
+ return domain;
+}
- if (!domain)
- return NULL;
+static struct dmar_domain *set_domain_for_dev(struct device *dev,
+ struct dmar_domain *domain)
+{
+ struct intel_iommu *iommu;
+ struct dmar_domain *tmp;
+ u16 req_id, dma_alias;
+ u8 bus, devfn;
+
+ iommu = device_to_iommu(dev, &bus, &devfn);
+ if (!iommu)
+ return NULL;
+
+ req_id = ((u16)bus << 8) | devfn;
+
+ if (dev_is_pci(dev)) {
+ struct pci_dev *pdev = to_pci_dev(dev);
+
+ pci_for_each_dma_alias(pdev, get_last_alias, &dma_alias);
+
+ /* register PCI DMA alias device */
+ if (req_id != dma_alias) {
+ tmp = dmar_insert_one_dev_info(iommu, PCI_BUS_NUM(dma_alias),
+ dma_alias & 0xff, NULL, domain);
+
+ if (!tmp || tmp != domain)
+ return tmp;
+ }
}
-found_domain:
tmp = dmar_insert_one_dev_info(iommu, bus, devfn, dev, domain);
+ if (!tmp || tmp != domain)
+ return tmp;
+
+ return domain;
+}
- if (!tmp || tmp != domain) {
+static struct dmar_domain *get_domain_for_dev(struct device *dev, int gaw)
+{
+ struct dmar_domain *domain, *tmp;
+
+ domain = find_domain(dev);
+ if (domain)
+ goto out;
+
+ domain = find_or_alloc_domain(dev, gaw);
+ if (!domain)
+ goto out;
+
+ tmp = set_domain_for_dev(dev, domain);
+ if (!tmp || domain != tmp) {
domain_exit(domain);
domain = tmp;
}
+out:
+
return domain;
}