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| author | Joerg Roedel <joerg.roedel@amd.com> | 2008-12-10 19:33:26 +0100 |
|---|---|---|
| committer | Joerg Roedel <joerg.roedel@amd.com> | 2009-01-03 14:11:56 +0100 |
| commit | 1ac4cbbc5eb56de96d264d10f464ba5222815b1b (patch) | |
| tree | 1d98c0382683b4c7ec40602273fed14aabf222c7 /arch/x86/kernel/amd_iommu.c | |
| parent | e2dc14a2a6c9a83baaafc51f06b7e73cec2167be (diff) | |
| download | lwn-1ac4cbbc5eb56de96d264d10f464ba5222815b1b.tar.gz lwn-1ac4cbbc5eb56de96d264d10f464ba5222815b1b.zip | |
AMD IOMMU: allocate a new protection for hotplugged devices
Impact: also hotplug devices benefit from device isolation
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Diffstat (limited to 'arch/x86/kernel/amd_iommu.c')
| -rw-r--r-- | arch/x86/kernel/amd_iommu.c | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/arch/x86/kernel/amd_iommu.c b/arch/x86/kernel/amd_iommu.c index f2956546423b..f2260609eadc 100644 --- a/arch/x86/kernel/amd_iommu.c +++ b/arch/x86/kernel/amd_iommu.c @@ -923,6 +923,8 @@ static int device_change_notifier(struct notifier_block *nb, struct protection_domain *domain; struct dma_ops_domain *dma_domain; struct amd_iommu *iommu; + int order = amd_iommu_aperture_order; + unsigned long flags; if (devid > amd_iommu_last_bdf) goto out; @@ -955,6 +957,21 @@ static int device_change_notifier(struct notifier_block *nb, goto out; detach_device(domain, devid); break; + case BUS_NOTIFY_ADD_DEVICE: + /* allocate a protection domain if a device is added */ + dma_domain = find_protection_domain(devid); + if (dma_domain) + goto out; + dma_domain = dma_ops_domain_alloc(iommu, order); + if (!dma_domain) + goto out; + dma_domain->target_dev = devid; + + spin_lock_irqsave(&iommu_pd_list_lock, flags); + list_add_tail(&dma_domain->list, &iommu_pd_list); + spin_unlock_irqrestore(&iommu_pd_list_lock, flags); + + break; default: goto out; } |