From be831297716036de5b24308447ecb69f1706a846 Mon Sep 17 00:00:00 2001 From: Joerg Roedel Date: Mon, 23 Nov 2009 12:50:00 +0100 Subject: [PATCH] x86/amd-iommu: attach devices to pre-allocated domains early For some devices the ACPI table may define unity map requirements which must me met when the IOMMU is enabled. So we need to attach devices to their domains as early as possible so that these mappings are in place when needed. This patch assigns the domains right after they are allocated. Otherwise this can result in I/O page faults before a driver binds to a device and BIOS is still using it. Cc: stable@kernel.org Signed-off-by: Joerg Roedel --- arch/x86/kernel/amd_iommu.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/arch/x86/kernel/amd_iommu.c b/arch/x86/kernel/amd_iommu.c index 093bd526c949..b74b21247584 100644 --- a/arch/x86/kernel/amd_iommu.c +++ b/arch/x86/kernel/amd_iommu.c @@ -2047,10 +2047,10 @@ static void prealloc_protection_domains(void) struct pci_dev *dev = NULL; struct dma_ops_domain *dma_dom; struct amd_iommu *iommu; - u16 devid; + u16 devid, __devid; while ((dev = pci_get_device(PCI_ANY_ID, PCI_ANY_ID, dev)) != NULL) { - devid = calc_devid(dev->bus->number, dev->devfn); + __devid = devid = calc_devid(dev->bus->number, dev->devfn); if (devid > amd_iommu_last_bdf) continue; devid = amd_iommu_alias_table[devid]; @@ -2065,6 +2065,10 @@ static void prealloc_protection_domains(void) init_unity_mappings_for_device(dma_dom, devid); dma_dom->target_dev = devid; + attach_device(iommu, &dma_dom->domain, devid); + if (__devid != devid) + attach_device(iommu, &dma_dom->domain, __devid); + list_add_tail(&dma_dom->list, &iommu_pd_list); } } -- GitLab