iommu/amd: Introduce early_amd_iommu_init routine

Split out the code to parse the ACPI table and setup
relevant data structures into a new function.

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

1 files changed, 23 insertions, 15 deletions

diff --git a/drivers/iommu/amd_iommu_init.c b/drivers/iommu/amd_iommu_init.c
index b18034a8fdb3..a5dbefb8e260 100644
--- a/drivers/iommu/amd_iommu_init.c
+++ b/drivers/iommu/amd_iommu_init.c
@@ -1491,17 +1491,14 @@ static void __init free_on_init_error(void)
  * After everything is set up the IOMMUs are enabled and the necessary
  * hotplug and suspend notifiers are registered.
  */
-int __init amd_iommu_init_hardware(void)
+static int __init early_amd_iommu_init(void)
 {
         struct acpi_table_header *ivrs_base;
         acpi_size ivrs_size;
         acpi_status status;
         int i, ret = 0;
 
-        if (no_iommu || (iommu_detected && !gart_iommu_aperture))
-                return -ENODEV;
-
-        if (amd_iommu_disabled || !amd_iommu_detected)
+        if (!amd_iommu_detected)
                 return -ENODEV;
 
         if (amd_iommu_dev_table != NULL) {
@@ -1588,16 +1585,6 @@ int __init amd_iommu_init_hardware(void)
         if (ret)
                 goto free;
 
-        ret = amd_iommu_init_pci();
-        if (ret)
-                goto free;
-
-        enable_iommus();
-
-        amd_iommu_init_notifier();
-
-        register_syscore_ops(&amd_iommu_syscore_ops);
-
 out:
         /* Don't leak any ACPI memory */
         early_acpi_os_unmap_memory((char __iomem *)ivrs_base, ivrs_size);
@@ -1611,6 +1598,27 @@ free:
         goto out;
 }
 
+int __init amd_iommu_init_hardware(void)
+{
+        int ret = 0;
+
+        ret = early_amd_iommu_init();
+        if (ret)
+                return ret;
+
+        ret = amd_iommu_init_pci();
+        if (ret)
+                return ret;
+
+        enable_iommus();
+
+        amd_iommu_init_notifier();
+
+        register_syscore_ops(&amd_iommu_syscore_ops);
+
+        return ret;
+}
+
 static int amd_iommu_enable_interrupts(void)
 {
         struct amd_iommu *iommu;