AMD IOMMU: add domain cleanup helper function

Impact: add a function to remove all devices from a domain

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

1 files changed, 28 insertions, 0 deletions

diff --git a/arch/x86/kernel/amd_iommu.c b/arch/x86/kernel/amd_iommu.c
index 140875b3f6ef..5d3f085289eb 100644
--- a/arch/x86/kernel/amd_iommu.c
+++ b/arch/x86/kernel/amd_iommu.c
@@ -1579,3 +1579,31 @@ free_domains:
 
         return ret;
 }
+
+/*****************************************************************************
+ *
+ * The following functions belong to the exported interface of AMD IOMMU
+ *
+ * This interface allows access to lower level functions of the IOMMU
+ * like protection domain handling and assignement of devices to domains
+ * which is not possible with the dma_ops interface.
+ *
+ *****************************************************************************/
+
+#ifdef CONFIG_IOMMU_API
+
+static void cleanup_domain(struct protection_domain *domain)
+{
+        unsigned long flags;
+        u16 devid;
+
+        write_lock_irqsave(&amd_iommu_devtable_lock, flags);
+
+        for (devid = 0; devid <= amd_iommu_last_bdf; ++devid)
+                if (amd_iommu_pd_table[devid] == domain)
+                        __detach_device(domain, devid);
+
+        write_unlock_irqrestore(&amd_iommu_devtable_lock, flags);
+}
+
+#endif