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>
diff --git a/drivers/pci/intr_remapping.c b/drivers/pci/intr_remapping.c
index c38e3f4..0d202d7 100644
--- a/drivers/pci/intr_remapping.c
+++ b/drivers/pci/intr_remapping.c
@@ -467,6 +467,33 @@
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;