x86, dmar: routines for disabling queued invalidation and intr remapping

Impact: new interfaces (not yet used)

Routines for disabling queued invalidation and interrupt remapping.

Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>

1 files changed, 27 insertions, 0 deletions

diff --git a/drivers/pci/intr_remapping.c b/drivers/pci/intr_remapping.c
index c38e3f437a81..0d202d73a1ac 100644
--- a/drivers/pci/intr_remapping.c
+++ b/drivers/pci/intr_remapping.c
@@ -467,6 +467,33 @@ static int setup_intr_remapping(struct intel_iommu *iommu, int mode)
         return 0;
 }
 
+/*
+ * Disable Interrupt Remapping.
+ */
+static void disable_intr_remapping(struct intel_iommu *iommu)
+{
+        unsigned long flags;
+        u32 sts;
+
+        if (!ecap_ir_support(iommu->ecap))
+                return;
+
+        spin_lock_irqsave(&iommu->register_lock, flags);
+
+        sts = dmar_readq(iommu->reg + DMAR_GSTS_REG);
+        if (!(sts & DMA_GSTS_IRES))
+                goto end;
+
+        iommu->gcmd &= ~DMA_GCMD_IRE;
+        writel(iommu->gcmd, iommu->reg + DMAR_GCMD_REG);
+
+        IOMMU_WAIT_OP(iommu, DMAR_GSTS_REG,
+                      readl, !(sts & DMA_GSTS_IRES), sts);
+
+end:
+        spin_unlock_irqrestore(&iommu->register_lock, flags);
+}
+
 int __init enable_intr_remapping(int eim)
 {
         struct dmar_drhd_unit *drhd;