iommu/amd: Move IO page table related functions

Preparing to migrate to use IO page table framework.
There is no functional change.
Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
Link: https://lore.kernel.org/r/20201215073705.123786-7-suravee.suthikulpanit@amd.comSigned-off-by: Joerg Roedel <jroedel@suse.de>

drivers/iommu/amd/amd_iommu.h

@@ -131,4 +131,22 @@ void amd_iommu_apply_ivrs_quirks(void);
 static inline void amd_iommu_apply_ivrs_quirks(void) { }
 #endif
 
+/* TODO: These are temporary and will be removed once fully transition */
+extern void free_pagetable(struct domain_pgtable *pgtable);
+extern int iommu_map_page(struct protection_domain *dom,
+			  unsigned long bus_addr,
+			  unsigned long phys_addr,
+			  unsigned long page_size,
+			  int prot,
+			  gfp_t gfp);
+extern unsigned long iommu_unmap_page(struct protection_domain *dom,
+				      unsigned long bus_addr,
+				      unsigned long page_size);
+extern u64 *fetch_pte(struct protection_domain *domain,
+		      unsigned long address,
+		      unsigned long *page_size);
+extern void amd_iommu_domain_get_pgtable(struct protection_domain *domain,
+					 struct domain_pgtable *pgtable);
+extern void amd_iommu_domain_set_pgtable(struct protection_domain *domain,
+					 u64 *root, int mode);
 #endif