x86/amd-iommu: enable iommu before attaching devices

commit 75f66533bc883f761a7adcab3281fe3323efbc90 upstream.

Hit another kdump problem as reported by Neil Horman.  When initializaing
the IOMMU, we attach devices to their domains before the IOMMU is
fully (re)initialized.  Attaching a device will issue some important
invalidations.  In the context of the newly kexec'd kdump kernel, the
IOMMU may have stale cached data from the original kernel.  Because we
do the attach too early, the invalidation commands are placed in the new
command buffer before the IOMMU is updated w/ that buffer.  This leaves
the stale entries in the kdump context and can renders device unusable.
Simply enable the IOMMU before we do the attach.

Cc: Neil Horman <nhorman@tuxdriver.com>
Cc: Vivek Goyal <vgoyal@redhat.com>
Signed-off-by: Chris Wright <chrisw@sous-sol.org>
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 3 insertions, 2 deletions

diff --git a/arch/x86/kernel/amd_iommu_init.c b/arch/x86/kernel/amd_iommu_init.c
index 9dc91b431470..883d61990623 100644
--- a/arch/x86/kernel/amd_iommu_init.c
+++ b/arch/x86/kernel/amd_iommu_init.c
@@ -1288,6 +1288,8 @@ static int __init amd_iommu_init(void)
         if (ret)
                 goto free;
 
+        enable_iommus();
+
         if (iommu_pass_through)
                 ret = amd_iommu_init_passthrough();
         else
@@ -1300,8 +1302,6 @@ static int __init amd_iommu_init(void)
 
         amd_iommu_init_notifier();
 
-        enable_iommus();
-
         if (iommu_pass_through)
                 goto out;
 
@@ -1315,6 +1315,7 @@ out:
         return ret;
 
 free:
+        disable_iommus();
 
         amd_iommu_uninit_devices();