iommu/amd: X2apic mode: re-enable after resume

[ Upstream commit 01b297a48a26bcb96769505ac948db4603b72bd1 ]

Otherwise it is guaranteed to not work after the resume...

Fixes: 66929812955bb ("iommu/amd: Add support for X2APIC IOMMU interrupts")
Signed-off-by: Maxim Levitsky <mlevitsk@redhat.com>
Link: https://lore.kernel.org/r/20211123161038.48009-3-mlevitsk@redhat.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/iommu/amd/init.c b/drivers/iommu/amd/init.c
index 9b12a2f7548ac6936d61360eb57d3d9f6f7c35fe..c1d4e66d2747b3c92c5c8d791682b2e1f630e1f4 100644 (file)
--- a/drivers/iommu/amd/init.c
+++ b/drivers/iommu/amd/init.c
@@ -2169,7 +2169,6 @@ static int iommu_setup_intcapxt(struct amd_iommu *iommu)
                return ret;
        }
 
-       iommu_feature_enable(iommu, CONTROL_INTCAPXT_EN);
        return 0;
 }
 
@@ -2192,6 +2191,10 @@ static int iommu_init_irq(struct amd_iommu *iommu)
 
        iommu->int_enabled = true;
 enable_faults:
+
+       if (amd_iommu_xt_mode == IRQ_REMAP_X2APIC_MODE)
+               iommu_feature_enable(iommu, CONTROL_INTCAPXT_EN);
+
        iommu_feature_enable(iommu, CONTROL_EVT_INT_EN);
 
        if (iommu->ppr_log != NULL)