x86/amd-iommu: Add function to flush all DTEs on one IOMMU

This function flushes all DTE entries on one IOMMU for all
devices behind this IOMMU. This is required for command
buffer resetting later.

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

diff --git a/arch/x86/kernel/amd_iommu.c b/arch/x86/kernel/amd_iommu.c
index 64cc582feb9bf561f1534d3ed59e7335302c5edd..2dc093370d2de0e45e52fab36bc4fc7741e8a06b 100644 (file)
--- a/arch/x86/kernel/amd_iommu.c
+++ b/arch/x86/kernel/amd_iommu.c
@@ -516,6 +516,19 @@ void amd_iommu_flush_all_domains(void)
                flush_all_domains_on_iommu(iommu);
 }
 
+static void flush_all_devices_for_iommu(struct amd_iommu *iommu)
+{
+       int i;
+
+       for (i = 0; i <= amd_iommu_last_bdf; ++i) {
+               if (iommu != amd_iommu_rlookup_table[i])
+                       continue;
+
+               iommu_queue_inv_dev_entry(iommu, i);
+               iommu_completion_wait(iommu);
+       }
+}
+
 void amd_iommu_flush_all_devices(void)
 {
        struct amd_iommu *iommu;