iommu: rename wrapper functions

A subsequent patch will add semantically different versions of
iommu_map/unmap() so, in advance of that change, this patch renames the
existing functions to iommu_legacy_map/unmap() and modifies all call-sites.
It also adjusts a comment that refers to iommu_map_page(), which was re-
named by a previous patch.

This patch is purely cosmetic. No functional change.
Signed-off-by: Paul Durrant <paul.durrant@citrix.com>
Acked-by: Jan Beulich <jbeulich@suse.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>

xen/arch/x86/mm.c

@@ -2801,12 +2801,13 @@ static int _get_page_type(struct page_info *page, unsigned long type,
             mfn_t mfn = page_to_mfn(page);
 
             if ( (x & PGT_type_mask) == PGT_writable_page )
-                iommu_ret = iommu_unmap(d, _dfn(mfn_x(mfn)),
-                                        PAGE_ORDER_4K);
+                iommu_ret = iommu_legacy_unmap(d, _dfn(mfn_x(mfn)),
+                                               PAGE_ORDER_4K);
             else if ( type == PGT_writable_page )
-                iommu_ret = iommu_map(d, _dfn(mfn_x(mfn)), mfn,
-                                      PAGE_ORDER_4K,
-                                      IOMMUF_readable | IOMMUF_writable);
+                iommu_ret = iommu_legacy_map(d, _dfn(mfn_x(mfn)), mfn,
+                                             PAGE_ORDER_4K,
+                                             IOMMUF_readable |
+                                             IOMMUF_writable);
         }
     }
 

xen/arch/x86/mm/p2m-ept.c

@@ -885,8 +885,8 @@ out:
             rc = iommu_pte_flush(d, gfn, &ept_entry->epte, order, vtd_pte_present);
         else if ( need_iommu_pt_sync(d) )
             rc = iommu_flags ?
-                iommu_map(d, _dfn(gfn), mfn, order, iommu_flags) :
-                iommu_unmap(d, _dfn(gfn), order);
+                iommu_legacy_map(d, _dfn(gfn), mfn, order, iommu_flags) :
+                iommu_legacy_unmap(d, _dfn(gfn), order);
     }
 
     unmap_domain_page(table);

xen/arch/x86/mm/p2m-pt.c

@@ -694,8 +694,9 @@ p2m_pt_set_entry(struct p2m_domain *p2m, gfn_t gfn_, mfn_t mfn,
 
         if ( need_iommu_pt_sync(p2m->domain) )
             rc = iommu_pte_flags ?
-                iommu_map(d, _dfn(gfn), mfn, page_order, iommu_pte_flags) :
-                iommu_unmap(d, _dfn(gfn), page_order);
+                iommu_legacy_map(d, _dfn(gfn), mfn, page_order,
+                                 iommu_pte_flags) :
+                iommu_legacy_unmap(d, _dfn(gfn), page_order);
         else if ( iommu_use_hap_pt(d) && iommu_old_flags )
             amd_iommu_flush_pages(p2m->domain, gfn, page_order);
     }

xen/arch/x86/mm/p2m.c

@@ -780,7 +780,7 @@ p2m_remove_page(struct p2m_domain *p2m, unsigned long gfn_l, unsigned long mfn,
 
     if ( !paging_mode_translate(p2m->domain) )
         return need_iommu_pt_sync(p2m->domain) ?
-            iommu_unmap(p2m->domain, _dfn(mfn), page_order) : 0;
+            iommu_legacy_unmap(p2m->domain, _dfn(mfn), page_order) : 0;
 
     ASSERT(gfn_locked_by_me(p2m, gfn));
     P2M_DEBUG("removing gfn=%#lx mfn=%#lx\n", gfn_l, mfn);
@@ -827,8 +827,8 @@ guest_physmap_add_entry(struct domain *d, gfn_t gfn, mfn_t mfn,
 
     if ( !paging_mode_translate(d) )
         return (need_iommu_pt_sync(d) && t == p2m_ram_rw) ?
-            iommu_map(d, _dfn(mfn_x(mfn)), mfn, page_order,
-                      IOMMUF_readable | IOMMUF_writable) : 0;
+            iommu_legacy_map(d, _dfn(mfn_x(mfn)), mfn, page_order,
+                             IOMMUF_readable | IOMMUF_writable) : 0;
 
     /* foreign pages are added thru p2m_add_foreign */
     if ( p2m_is_foreign(t) )
@@ -1302,8 +1302,8 @@ int set_identity_p2m_entry(struct domain *d, unsigned long gfn_l,
     {
         if ( !need_iommu_pt_sync(d) )
             return 0;
-        return iommu_map(d, _dfn(gfn_l), _mfn(gfn_l), PAGE_ORDER_4K,
-                         IOMMUF_readable | IOMMUF_writable);
+        return iommu_legacy_map(d, _dfn(gfn_l), _mfn(gfn_l), PAGE_ORDER_4K,
+                                IOMMUF_readable | IOMMUF_writable);
     }
 
     gfn_lock(p2m, gfn, 0);
@@ -1393,7 +1393,7 @@ int clear_identity_p2m_entry(struct domain *d, unsigned long gfn_l)
     {
         if ( !need_iommu_pt_sync(d) )
             return 0;
-        return iommu_unmap(d, _dfn(gfn_l), PAGE_ORDER_4K);
+        return iommu_legacy_unmap(d, _dfn(gfn_l), PAGE_ORDER_4K);
     }
 
     gfn_lock(p2m, gfn, 0);

xen/arch/x86/x86_64/mm.c

@@ -1436,15 +1436,16 @@ int memory_add(unsigned long spfn, unsigned long epfn, unsigned int pxm)
          !need_iommu_pt_sync(hardware_domain) )
     {
         for ( i = spfn; i < epfn; i++ )
-            if ( iommu_map(hardware_domain, _dfn(i), _mfn(i),
-                           PAGE_ORDER_4K,
-                           IOMMUF_readable | IOMMUF_writable) )
+            if ( iommu_legacy_map(hardware_domain, _dfn(i), _mfn(i),
+                                  PAGE_ORDER_4K,
+                                  IOMMUF_readable | IOMMUF_writable) )
                 break;
         if ( i != epfn )
         {
             while (i-- > old_max)
                 /* If statement to satisfy __must_check. */
-                if ( iommu_unmap(hardware_domain, _dfn(i), PAGE_ORDER_4K) )
+                if ( iommu_legacy_unmap(hardware_domain, _dfn(i),
+                                        PAGE_ORDER_4K) )
                     continue;
 
             goto destroy_m2p;

xen/common/grant_table.c

@@ -1134,14 +1134,14 @@ map_grant_ref(
              !(old_pin & (GNTPIN_hstw_mask|GNTPIN_devw_mask)) )
         {
             if ( !(kind & MAPKIND_WRITE) )
-                err = iommu_map(ld, _dfn(mfn_x(mfn)), mfn, 0,
-                                IOMMUF_readable | IOMMUF_writable);
+                err = iommu_legacy_map(ld, _dfn(mfn_x(mfn)), mfn, 0,
+                                       IOMMUF_readable | IOMMUF_writable);
         }
         else if ( act_pin && !old_pin )
         {
             if ( !kind )
-                err = iommu_map(ld, _dfn(mfn_x(mfn)), mfn, 0,
-                                IOMMUF_readable);
+                err = iommu_legacy_map(ld, _dfn(mfn_x(mfn)), mfn, 0,
+                                       IOMMUF_readable);
         }
         if ( err )
         {
@@ -1389,10 +1389,10 @@ unmap_common(
 
         kind = mapkind(lgt, rd, op->mfn);
         if ( !kind )
-            err = iommu_unmap(ld, _dfn(mfn_x(op->mfn)), 0);
+            err = iommu_legacy_unmap(ld, _dfn(mfn_x(op->mfn)), 0);
         else if ( !(kind & MAPKIND_WRITE) )
-            err = iommu_map(ld, _dfn(mfn_x(op->mfn)), op->mfn, 0,
-                            IOMMUF_readable);
+            err = iommu_legacy_map(ld, _dfn(mfn_x(op->mfn)), op->mfn, 0,
+                                   IOMMUF_readable);
 
         double_gt_unlock(lgt, rgt);
 

xen/common/memory.c

@@ -853,11 +853,11 @@ int xenmem_add_to_physmap(struct domain *d, struct xen_add_to_physmap *xatp,
 
         this_cpu(iommu_dont_flush_iotlb) = 0;
 
-        ret = iommu_iotlb_flush(d, _dfn(xatp->idx - done), done);
+        ret = iommu_flush(d, _dfn(xatp->idx - done), done);
         if ( unlikely(ret) && rc >= 0 )
             rc = ret;
 
-        ret = iommu_iotlb_flush(d, _dfn(xatp->gpfn - done), done);
+        ret = iommu_flush(d, _dfn(xatp->gpfn - done), done);
         if ( unlikely(ret) && rc >= 0 )
             rc = ret;
     }

xen/drivers/passthrough/iommu.c

@@ -304,8 +304,8 @@ void iommu_domain_destroy(struct domain *d)
     arch_iommu_domain_destroy(d);
 }
 
-int iommu_map(struct domain *d, dfn_t dfn, mfn_t mfn,
-              unsigned int page_order, unsigned int flags)
+int iommu_legacy_map(struct domain *d, dfn_t dfn, mfn_t mfn,
+                     unsigned int page_order, unsigned int flags)
 {
     const struct domain_iommu *hd = dom_iommu(d);
     unsigned long i;
@@ -345,7 +345,7 @@ int iommu_map(struct domain *d, dfn_t dfn, mfn_t mfn,
     return rc;
 }
 
-int iommu_unmap(struct domain *d, dfn_t dfn, unsigned int page_order)
+int iommu_legacy_unmap(struct domain *d, dfn_t dfn, unsigned int page_order)
 {
     const struct domain_iommu *hd = dom_iommu(d);
     unsigned long i;

xen/drivers/passthrough/x86/iommu.c

@@ -241,8 +241,8 @@ void __hwdom_init arch_iommu_hwdom_init(struct domain *d)
         if ( paging_mode_translate(d) )
             rc = set_identity_p2m_entry(d, pfn, p2m_access_rw, 0);
         else
-            rc = iommu_map(d, _dfn(pfn), _mfn(pfn), PAGE_ORDER_4K,
-                           IOMMUF_readable | IOMMUF_writable);
+            rc = iommu_legacy_map(d, _dfn(pfn), _mfn(pfn), PAGE_ORDER_4K,
+                                  IOMMUF_readable | IOMMUF_writable);
         if ( rc )
             printk(XENLOG_WARNING " d%d: IOMMU mapping failed: %d\n",
                    d->domain_id, rc);

xen/include/xen/iommu.h

@@ -83,15 +83,21 @@ int iommu_construct(struct domain *d);
 /* Function used internally, use iommu_domain_destroy */
 void iommu_teardown(struct domain *d);
 
-/* iommu_map_page() takes flags to direct the mapping operation. */
+/*
+ * The following flags are passed to map operations and passed by lookup
+ * operations.
+ */
 #define _IOMMUF_readable 0
 #define IOMMUF_readable  (1u<<_IOMMUF_readable)
 #define _IOMMUF_writable 1
 #define IOMMUF_writable  (1u<<_IOMMUF_writable)
-int __must_check iommu_map(struct domain *d, dfn_t dfn, mfn_t mfn,
-                           unsigned int page_order, unsigned int flags);
-int __must_check iommu_unmap(struct domain *d, dfn_t dfn,
-                             unsigned int page_order);
+
+int __must_check iommu_legacy_map(struct domain *d, dfn_t dfn, mfn_t mfn,
+                                  unsigned int page_order,
+                                  unsigned int flags);
+int __must_check iommu_legacy_unmap(struct domain *d, dfn_t dfn,
+                                    unsigned int page_order);
+
 int __must_check iommu_lookup_page(struct domain *d, dfn_t dfn, mfn_t *mfn,
                                    unsigned int *flags);