Messages in this thread Patch in this message | | | From | Joerg Roedel <> | Subject | [PATCH 14/19] AMD IOMMU: add device detach function for IOMMU API | Date | Thu, 4 Dec 2008 18:31:51 +0100 |
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Impact: add a generic function to detach devices from protection domains
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com> --- arch/x86/kernel/amd_iommu.c | 51 +++++++++++++++++++++++++++++++++++++++++++ 1 files changed, 51 insertions(+), 0 deletions(-)
diff --git a/arch/x86/kernel/amd_iommu.c b/arch/x86/kernel/amd_iommu.c index fd42926..0ded6f4 100644 --- a/arch/x86/kernel/amd_iommu.c +++ b/arch/x86/kernel/amd_iommu.c @@ -1529,3 +1529,54 @@ static void amd_iommu_domain_destroy(struct iommu_domain *dom) dom->priv = NULL; } + +static void __detach_device(struct protection_domain *domain, u16 devid) +{ + unsigned long flags; + + /* lock domain and device table */ + write_lock_irqsave(&amd_iommu_devtable_lock, flags); + spin_lock(&domain->lock); + + /* remove domain from the lookup table */ + amd_iommu_pd_table[devid] = NULL; + + /* remove entry from the device table seen by the hardware */ + amd_iommu_dev_table[devid].data[0] = IOMMU_PTE_P | IOMMU_PTE_TV; + amd_iommu_dev_table[devid].data[1] = 0; + amd_iommu_dev_table[devid].data[2] = 0; + + /* decrease reference counter */ + domain->dev_cnt -= 1; + + /* ready */ + spin_unlock(&domain->lock); + write_unlock_irqrestore(&amd_iommu_devtable_lock, flags); +} + +static void amd_iommu_detach_device(struct iommu_domain *dom, + struct device *dev) +{ + struct protection_domain *domain = dom->priv; + struct amd_iommu *iommu; + struct pci_dev *pdev; + u16 devid; + + if (dev->bus != &pci_bus_type) + return; + + pdev = to_pci_dev(dev); + + devid = calc_devid(pdev->bus->number, pdev->devfn); + + if (devid > 0) + __detach_device(domain, devid); + + iommu = amd_iommu_rlookup_table[devid]; + if (!iommu) + return; + + iommu_queue_inv_dev_entry(iommu, devid); + iommu_completion_wait(iommu); +} + -- 1.5.6.4
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