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Subject[PATCH 17/21] AMD IOMMU: add device attach function for IOMMU API
Date
Impact: add a generic function to attach devices to protection domains

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
---
arch/x86/kernel/amd_iommu.c | 35 +++++++++++++++++++++++++++++++++++
1 files changed, 35 insertions(+), 0 deletions(-)

diff --git a/arch/x86/kernel/amd_iommu.c b/arch/x86/kernel/amd_iommu.c
index 60e268a..97eb60d 100644
--- a/arch/x86/kernel/amd_iommu.c
+++ b/arch/x86/kernel/amd_iommu.c
@@ -1600,3 +1600,38 @@ static void amd_iommu_detach_device(struct iommu_domain *dom,
iommu_completion_wait(iommu);
}

+static int amd_iommu_attach_device(struct iommu_domain *dom,
+ struct device *dev)
+{
+ struct protection_domain *domain = dom->priv;
+ struct protection_domain *old_domain;
+ struct amd_iommu *iommu;
+ struct pci_dev *pdev;
+ u16 devid;
+
+ if (dev->bus != &pci_bus_type)
+ return -EINVAL;
+
+ pdev = to_pci_dev(dev);
+
+ devid = calc_devid(pdev->bus->number, pdev->devfn);
+
+ if (devid >= amd_iommu_last_bdf ||
+ devid != amd_iommu_alias_table[devid])
+ return -EINVAL;
+
+ iommu = amd_iommu_rlookup_table[devid];
+ if (!iommu)
+ return -EINVAL;
+
+ old_domain = domain_for_device(devid);
+ if (old_domain)
+ __detach_device(old_domain, devid);
+
+ set_device_domain(iommu, domain, devid);
+
+ iommu_completion_wait(iommu);
+
+ return 0;
+}
+
--
1.5.6.4



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