iommu/amd: Make sure IOMMU interrupts are re-enabled on resume

Unfortunatly the interrupts for the event log and the
peripheral page-faults are only enabled at boot but not
re-enabled at resume. Fix that.

Cc: stable@vger.kernel.org
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>

1 files changed, 20 insertions, 10 deletions

diff --git a/drivers/iommu/amd_iommu_init.c b/drivers/iommu/amd_iommu_init.c
index 526652a7385d..182b80ba79c5 100644
--- a/drivers/iommu/amd_iommu_init.c
+++ b/drivers/iommu/amd_iommu_init.c
@@ -1123,8 +1123,9 @@ static int iommu_setup_msi(struct amd_iommu *iommu)
 {
         int r;
 
-        if (pci_enable_msi(iommu->dev))
-                return 1;
+        r = pci_enable_msi(iommu->dev);
+        if (r)
+                return r;
 
         r = request_threaded_irq(iommu->dev->irq,
                                  amd_iommu_int_handler,
@@ -1134,27 +1135,36 @@ static int iommu_setup_msi(struct amd_iommu *iommu)
 
         if (r) {
                 pci_disable_msi(iommu->dev);
-                return 1;
+                return r;
         }
 
         iommu->int_enabled = true;
-        iommu_feature_enable(iommu, CONTROL_EVT_INT_EN);
-
-        if (iommu->ppr_log != NULL)
-                iommu_feature_enable(iommu, CONTROL_PPFINT_EN);
 
         return 0;
 }
 
 static int iommu_init_msi(struct amd_iommu *iommu)
 {
+        int ret;
+
         if (iommu->int_enabled)
-                return 0;
+                goto enable_faults;
 
         if (pci_find_capability(iommu->dev, PCI_CAP_ID_MSI))
-                return iommu_setup_msi(iommu);
+                ret = iommu_setup_msi(iommu);
+        else
+                ret = -ENODEV;
 
-        return 1;
+        if (ret)
+                return ret;
+
+enable_faults:
+        iommu_feature_enable(iommu, CONTROL_EVT_INT_EN);
+
+        if (iommu->ppr_log != NULL)
+                iommu_feature_enable(iommu, CONTROL_PPFINT_EN);
+
+        return 0;
 }
 
 /****************************************************************************