x86/amd-iommu: Move find_protection_domain to helper functions

This is a helper function and when its placed in the helper
function section we can remove its forward declaration.

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 e5bbe9a..405f8da 100644 (file)
--- a/arch/x86/kernel/amd_iommu.c
+++ b/arch/x86/kernel/amd_iommu.c
@@ -59,7 +59,6 @@ struct iommu_cmd {
 
 static int dma_ops_unity_map(struct dma_ops_domain *dma_dom,
                             struct unity_map_entry *e);
-static struct dma_ops_domain *find_protection_domain(u16 devid);
 static u64 *alloc_pte(struct protection_domain *domain,
                      unsigned long address, int end_lvl,
                      u64 **pte_page, gfp_t gfp);
@@ -84,6 +83,34 @@ static inline u16 get_device_id(struct device *dev)
        return calc_devid(pdev->bus->number, pdev->devfn);
 }
 
+/*
+ * In this function the list of preallocated protection domains is traversed to
+ * find the domain for a specific device
+ */
+static struct dma_ops_domain *find_protection_domain(u16 devid)
+{
+       struct dma_ops_domain *entry, *ret = NULL;
+       unsigned long flags;
+       u16 alias = amd_iommu_alias_table[devid];
+
+       if (list_empty(&iommu_pd_list))
+               return NULL;
+
+       spin_lock_irqsave(&iommu_pd_list_lock, flags);
+
+       list_for_each_entry(entry, &iommu_pd_list, list) {
+               if (entry->target_dev == devid ||
+                   entry->target_dev == alias) {
+                       ret = entry;
+                       break;
+               }
+       }
+
+       spin_unlock_irqrestore(&iommu_pd_list_lock, flags);
+
+       return ret;
+}
+
 #ifdef CONFIG_AMD_IOMMU_STATS
 
 /*
@@ -1456,34 +1483,6 @@ static bool check_device(struct device *dev)
 }
 
 /*
- * In this function the list of preallocated protection domains is traversed to
- * find the domain for a specific device
- */
-static struct dma_ops_domain *find_protection_domain(u16 devid)
-{
-       struct dma_ops_domain *entry, *ret = NULL;
-       unsigned long flags;
-       u16 alias = amd_iommu_alias_table[devid];
-
-       if (list_empty(&iommu_pd_list))
-               return NULL;
-
-       spin_lock_irqsave(&iommu_pd_list_lock, flags);
-
-       list_for_each_entry(entry, &iommu_pd_list, list) {
-               if (entry->target_dev == devid ||
-                   entry->target_dev == alias) {
-                       ret = entry;
-                       break;
-               }
-       }
-
-       spin_unlock_irqrestore(&iommu_pd_list_lock, flags);
-
-       return ret;
-}
-
-/*
  * In the dma_ops path we only have the struct device. This function
  * finds the corresponding IOMMU, the protection domain and the
  * requestor id for a given device.