x86/amd-iommu: Initialize passthrough mode when requested

This patch enables the passthrough mode for AMD IOMMU by
running the initialization function when iommu=pt is passed
on the kernel command line.

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

diff --git a/arch/x86/kernel/amd_iommu_init.c b/arch/x86/kernel/amd_iommu_init.c
index c1b17e97252e08f89f2221c2228642e0ff3dad81..f00f489ab150f78f45764402f3eb99bd39038e3f 100644 (file)
--- a/arch/x86/kernel/amd_iommu_init.c
+++ b/arch/x86/kernel/amd_iommu_init.c
@@ -1242,12 +1242,18 @@ int __init amd_iommu_init(void)
        if (ret)
                goto free;
 
-       ret = amd_iommu_init_dma_ops();
+       if (iommu_pass_through)
+               ret = amd_iommu_init_passthrough();
+       else
+               ret = amd_iommu_init_dma_ops();
        if (ret)
                goto free;
 
        enable_iommus();
 
+       if (iommu_pass_through)
+               goto out;
+
        printk(KERN_INFO "AMD IOMMU: device isolation ");
        if (amd_iommu_isolate)
                printk("enabled\n");