Messages in this thread Patch in this message | | | Subject | [PATCH RFC] iommu/amd: Fix missing iommu_shutdown initialization in passthrough mode | From | Shuah Khan <> | Date | Wed, 06 Jun 2012 10:50:06 -0600 |
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Change AMD iommu driver to call disable iommus in pass-through mode. AMD iommu driver's amd_iommu_init() routine doesn't initialize iommu_shutdown in pass-through mode. As a result iommu disable via a call to disable_iommus() doesn't happen at shutdown. Enable and disable of iommus is inconsistent in pass-through mode. IOMMU is enabled, but not disabled. IOMMU disable is called from error legs in amd_iommu_init() in pass-through mode.
Requesting for comments as I don't have access to AMD system that supports IOMMU. I tested the change on AMD platforms with GART IOMMU which is not sufficient.
Signed-off-by: Shuah Khan <shuah.khan@hp.com> --- drivers/iommu/amd_iommu_init.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/iommu/amd_iommu_init.c b/drivers/iommu/amd_iommu_init.c index c567903..1d8ab7f 100644 --- a/drivers/iommu/amd_iommu_init.c +++ b/drivers/iommu/amd_iommu_init.c @@ -1644,6 +1644,8 @@ static int __init amd_iommu_init(void) amd_iommu_init_api(); + x86_platform.iommu_shutdown = disable_iommus; + if (iommu_pass_through) goto out; @@ -1652,8 +1654,6 @@ static int __init amd_iommu_init(void) else printk(KERN_INFO "AMD-Vi: Lazy IO/TLB flushing enabled\n"); - x86_platform.iommu_shutdown = disable_iommus; - out: return ret; -- 1.7.9.5
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