AMD IOMMU: add domain id free function
Impact: add code to release a domain id
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 8a0fd3d..0922d5f 100644
--- a/arch/x86/kernel/amd_iommu.c
+++ b/arch/x86/kernel/amd_iommu.c
@@ -571,6 +571,18 @@
return id;
}
+#ifdef CONFIG_IOMMU_API
+static void domain_id_free(int id)
+{
+ unsigned long flags;
+
+ write_lock_irqsave(&amd_iommu_devtable_lock, flags);
+ if (id > 0 && id < MAX_DOMAIN_ID)
+ __clear_bit(id, amd_iommu_pd_alloc_bitmap);
+ write_unlock_irqrestore(&amd_iommu_devtable_lock, flags);
+}
+#endif
+
/*
* Used to reserve address ranges in the aperture (e.g. for exclusion
* ranges.