AMD IOMMU: add iommu_flush_domain function

Impact: add a function to flush a domain id on every IOMMU

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

1 files changed, 24 insertions, 0 deletions

diff --git a/arch/x86/kernel/amd_iommu.c b/arch/x86/kernel/amd_iommu.c
index b7b3067630cf..2b6b8e050bd8 100644
--- a/arch/x86/kernel/amd_iommu.c
+++ b/arch/x86/kernel/amd_iommu.c
@@ -352,6 +352,30 @@ static void iommu_flush_tlb(struct amd_iommu *iommu, u16 domid)
         iommu_queue_inv_iommu_pages(iommu, address, domid, 0, 1);
 }
 
+#ifdef CONFIG_IOMMU_API
+/*
+ * This function is used to flush the IO/TLB for a given protection domain
+ * on every IOMMU in the system
+ */
+static void iommu_flush_domain(u16 domid)
+{
+        unsigned long flags;
+        struct amd_iommu *iommu;
+        struct iommu_cmd cmd;
+
+        __iommu_build_inv_iommu_pages(&cmd, CMD_INV_IOMMU_ALL_PAGES_ADDRESS,
+                                      domid, 1, 1);
+
+        list_for_each_entry(iommu, &amd_iommu_list, list) {
+                spin_lock_irqsave(&iommu->lock, flags);
+                __iommu_queue_command(iommu, &cmd);
+                __iommu_completion_wait(iommu);
+                __iommu_wait_for_completion(iommu);
+                spin_unlock_irqrestore(&iommu->lock, flags);
+        }
+}
+#endif
+
 /****************************************************************************
  *
  * The functions below are used the create the page table mappings for