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authorDavid Woodhouse <David.Woodhouse@intel.com>2014-03-09 16:03:08 -0700
committerDavid Woodhouse <David.Woodhouse@intel.com>2014-03-24 14:07:55 +0000
commit3bdb259116059a6b805cfe9be66f4054f92598a3 (patch)
tree847d1c8e1ddae08e81daaac8e75cecb2730d2b82 /drivers/iommu
parent0b9d9753155b9ed72e864592f9bf482a688c3c11 (diff)
downloadop-kernel-dev-3bdb259116059a6b805cfe9be66f4054f92598a3.zip
op-kernel-dev-3bdb259116059a6b805cfe9be66f4054f92598a3.tar.gz
iommu/vt-d: Make iommu_should_identity_map() take struct device
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
Diffstat (limited to 'drivers/iommu')
-rw-r--r--drivers/iommu/intel-iommu.c107
1 files changed, 57 insertions, 50 deletions
diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index 7b2b9f3..ccfce88 100644
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -2518,58 +2518,65 @@ static bool device_has_rmrr(struct device *dev)
return false;
}
-static int iommu_should_identity_map(struct pci_dev *pdev, int startup)
+static int iommu_should_identity_map(struct device *dev, int startup)
{
- /*
- * We want to prevent any device associated with an RMRR from
- * getting placed into the SI Domain. This is done because
- * problems exist when devices are moved in and out of domains
- * and their respective RMRR info is lost. We exempt USB devices
- * from this process due to their usage of RMRRs that are known
- * to not be needed after BIOS hand-off to OS.
- */
- if (device_has_rmrr(&pdev->dev) &&
- (pdev->class >> 8) != PCI_CLASS_SERIAL_USB)
- return 0;
+ if (dev_is_pci(dev)) {
+ struct pci_dev *pdev = to_pci_dev(dev);
- if ((iommu_identity_mapping & IDENTMAP_AZALIA) && IS_AZALIA(pdev))
- return 1;
+ /*
+ * We want to prevent any device associated with an RMRR from
+ * getting placed into the SI Domain. This is done because
+ * problems exist when devices are moved in and out of domains
+ * and their respective RMRR info is lost. We exempt USB devices
+ * from this process due to their usage of RMRRs that are known
+ * to not be needed after BIOS hand-off to OS.
+ */
+ if (device_has_rmrr(dev) &&
+ (pdev->class >> 8) != PCI_CLASS_SERIAL_USB)
+ return 0;
- if ((iommu_identity_mapping & IDENTMAP_GFX) && IS_GFX_DEVICE(pdev))
- return 1;
+ if ((iommu_identity_mapping & IDENTMAP_AZALIA) && IS_AZALIA(pdev))
+ return 1;
- if (!(iommu_identity_mapping & IDENTMAP_ALL))
- return 0;
+ if ((iommu_identity_mapping & IDENTMAP_GFX) && IS_GFX_DEVICE(pdev))
+ return 1;
- /*
- * We want to start off with all devices in the 1:1 domain, and
- * take them out later if we find they can't access all of memory.
- *
- * However, we can't do this for PCI devices behind bridges,
- * because all PCI devices behind the same bridge will end up
- * with the same source-id on their transactions.
- *
- * Practically speaking, we can't change things around for these
- * devices at run-time, because we can't be sure there'll be no
- * DMA transactions in flight for any of their siblings.
- *
- * So PCI devices (unless they're on the root bus) as well as
- * their parent PCI-PCI or PCIe-PCI bridges must be left _out_ of
- * the 1:1 domain, just in _case_ one of their siblings turns out
- * not to be able to map all of memory.
- */
- if (!pci_is_pcie(pdev)) {
- if (!pci_is_root_bus(pdev->bus))
+ if (!(iommu_identity_mapping & IDENTMAP_ALL))
return 0;
- if (pdev->class >> 8 == PCI_CLASS_BRIDGE_PCI)
+
+ /*
+ * We want to start off with all devices in the 1:1 domain, and
+ * take them out later if we find they can't access all of memory.
+ *
+ * However, we can't do this for PCI devices behind bridges,
+ * because all PCI devices behind the same bridge will end up
+ * with the same source-id on their transactions.
+ *
+ * Practically speaking, we can't change things around for these
+ * devices at run-time, because we can't be sure there'll be no
+ * DMA transactions in flight for any of their siblings.
+ *
+ * So PCI devices (unless they're on the root bus) as well as
+ * their parent PCI-PCI or PCIe-PCI bridges must be left _out_ of
+ * the 1:1 domain, just in _case_ one of their siblings turns out
+ * not to be able to map all of memory.
+ */
+ if (!pci_is_pcie(pdev)) {
+ if (!pci_is_root_bus(pdev->bus))
+ return 0;
+ if (pdev->class >> 8 == PCI_CLASS_BRIDGE_PCI)
+ return 0;
+ } else if (pci_pcie_type(pdev) == PCI_EXP_TYPE_PCI_BRIDGE)
return 0;
- } else if (pci_pcie_type(pdev) == PCI_EXP_TYPE_PCI_BRIDGE)
- return 0;
+ } else {
+ if (device_has_rmrr(dev))
+ return 0;
+ }
- /*
+ /*
* At boot time, we don't yet know if devices will be 64-bit capable.
- * Assume that they will -- if they turn out not to be, then we can
+ * Assume that they will — if they turn out not to be, then we can
* take them out of the 1:1 domain later.
*/
if (!startup) {
@@ -2577,13 +2584,13 @@ static int iommu_should_identity_map(struct pci_dev *pdev, int startup)
* If the device's dma_mask is less than the system's memory
* size then this is not a candidate for identity mapping.
*/
- u64 dma_mask = pdev->dma_mask;
+ u64 dma_mask = *dev->dma_mask;
- if (pdev->dev.coherent_dma_mask &&
- pdev->dev.coherent_dma_mask < dma_mask)
- dma_mask = pdev->dev.coherent_dma_mask;
+ if (dev->coherent_dma_mask &&
+ dev->coherent_dma_mask < dma_mask)
+ dma_mask = dev->coherent_dma_mask;
- return dma_mask >= dma_get_required_mask(&pdev->dev);
+ return dma_mask >= dma_get_required_mask(dev);
}
return 1;
@@ -2599,7 +2606,7 @@ static int __init iommu_prepare_static_identity_mapping(int hw)
return -EFAULT;
for_each_pci_dev(pdev) {
- if (iommu_should_identity_map(pdev, 1)) {
+ if (iommu_should_identity_map(&pdev->dev, 1)) {
ret = domain_add_dev_info(si_domain, pdev,
hw ? CONTEXT_TT_PASS_THROUGH :
CONTEXT_TT_MULTI_LEVEL);
@@ -2917,7 +2924,7 @@ static int iommu_no_mapping(struct device *dev)
pdev = to_pci_dev(dev);
found = identity_mapping(dev);
if (found) {
- if (iommu_should_identity_map(pdev, 0))
+ if (iommu_should_identity_map(&pdev->dev, 0))
return 1;
else {
/*
@@ -2934,7 +2941,7 @@ static int iommu_no_mapping(struct device *dev)
* In case of a detached 64 bit DMA device from vm, the device
* is put into si_domain for identity mapping.
*/
- if (iommu_should_identity_map(pdev, 0)) {
+ if (iommu_should_identity_map(&pdev->dev, 0)) {
int ret;
ret = domain_add_dev_info(si_domain, pdev,
hw_pass_through ?
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