amd-iommu: handle alias entries correctly in init code

An alias entry in the ACPI table means that the device can send requests to the
IOMMU with both device ids, its own and the alias. This is not handled properly
in the ACPI init code. This patch fixes the issue.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>

1 files changed, 7 insertions, 4 deletions

diff --git a/arch/x86/kernel/amd_iommu_init.c b/arch/x86/kernel/amd_iommu_init.c
index 10b2accd12ea..ec72c7779d6b 100644
--- a/arch/x86/kernel/amd_iommu_init.c
+++ b/arch/x86/kernel/amd_iommu_init.c
@@ -691,6 +691,7 @@ static void __init init_iommu_from_acpi(struct amd_iommu *iommu,
 
                         devid = e->devid;
                         devid_to = e->ext >> 8;
+                        set_dev_entry_from_acpi(iommu, devid   , e->flags, 0);
                         set_dev_entry_from_acpi(iommu, devid_to, e->flags, 0);
                         amd_iommu_alias_table[devid] = devid_to;
                         break;
@@ -749,11 +750,13 @@ static void __init init_iommu_from_acpi(struct amd_iommu *iommu,
 
                         devid = e->devid;
                         for (dev_i = devid_start; dev_i <= devid; ++dev_i) {
-                                if (alias)
+                                if (alias) {
                                         amd_iommu_alias_table[dev_i] = devid_to;
-                                set_dev_entry_from_acpi(iommu,
-                                                amd_iommu_alias_table[dev_i],
-                                                flags, ext_flags);
+                                        set_dev_entry_from_acpi(iommu,
+                                                devid_to, flags, ext_flags);
+                                }
+                                set_dev_entry_from_acpi(iommu, dev_i,
+                                                        flags, ext_flags);
                         }
                         break;
                 default: