iommu/amd: Move gart fallback to amd_iommu_init
The fallback to the GART driver in the case amd_iommu doesn't work was
executed in a function called free_iommu_resources, which didn't really
make sense. This was even being called twice if amd_iommu=off was
specified on the command line.
The only complication is that it needs to be verified that amd_iommu has
fully relinquished control by calling free_iommu_resources and emptying
the amd_iommu_list.
Signed-off-by: Kevin Mitchell <kevmitch@arista.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
diff --git a/drivers/iommu/amd_iommu_init.c b/drivers/iommu/amd_iommu_init.c
index df144dc..b90e26e 100644
--- a/drivers/iommu/amd_iommu_init.c
+++ b/drivers/iommu/amd_iommu_init.c
@@ -2340,15 +2340,6 @@
amd_iommu_dev_table = NULL;
free_iommu_all();
-
-#ifdef CONFIG_GART_IOMMU
- /*
- * We failed to initialize the AMD IOMMU - try fallback to GART
- * if possible.
- */
- gart_iommu_init();
-
-#endif
}
/* SB IOAPIC is always on this device in AMD systems */
@@ -2767,6 +2758,16 @@
}
}
+#ifdef CONFIG_GART_IOMMU
+ if (ret && list_empty(&amd_iommu_list)) {
+ /*
+ * We failed to initialize the AMD IOMMU - try fallback
+ * to GART if possible.
+ */
+ gart_iommu_init();
+ }
+#endif
+
for_each_iommu(iommu)
amd_iommu_debugfs_setup(iommu);
