mm: split out mfn_t / gfn_t / pfn_t definitions and helpers

xen/mm.h has heavy dependencies, while in a number of cases only these
type definitions are needed. This separation then also allows pulling in
these definitions when including xen/mm.h would cause cyclic
dependencies.

Replace xen/mm.h inclusion where possible in include/xen/. (In
xen/iommu.h also take the opportunity and correct the few remaining
sorting issues.)

While the change could be dropped, remove an unnecessary asm/io.h
inclusion from xen/arch/x86/acpi/power.c. This was the initial attempt
to address build issues with it, until it became clear that the header
itself needs adjustment.
Signed-off-by: Jan Beulich <jbeulich@suse.com>
Acked-by: Julien Grall <jgrall@amazon.com>

xen/arch/x86/acpi/power.c

@@ -10,7 +10,6 @@
  * Slimmed with Xen specific support.
  */
 
-#include <asm/io.h>
 #include <xen/acpi.h>
 #include <xen/errno.h>
 #include <xen/iocap.h>

xen/drivers/char/meson-uart.c

@@ -18,7 +18,9 @@
  * License along with this program; If not, see <http://www.gnu.org/licenses/>.
  */
 
+#include <xen/errno.h>
 #include <xen/irq.h>
+#include <xen/mm.h>
 #include <xen/serial.h>
 #include <xen/vmap.h>
 #include <asm/io.h>

xen/drivers/char/mvebu-uart.c

@@ -18,7 +18,9 @@
  * License along with this program; If not, see <http://www.gnu.org/licenses/>.
  */
 
+#include <xen/errno.h>
 #include <xen/irq.h>
+#include <xen/mm.h>
 #include <xen/serial.h>
 #include <xen/vmap.h>
 #include <asm/io.h>

xen/include/asm-x86/io.h

@@ -49,6 +49,7 @@ __OUT(l,,int)
 
 /* Function pointer used to handle platform specific I/O port emulation. */
 #define IOEMUL_QUIRK_STUB_BYTES 9
+struct cpu_user_regs;
 extern unsigned int (*ioemul_handle_quirk)(
     u8 opcode, char *io_emul_stub, struct cpu_user_regs *regs);
 

xen/include/xen/grant_table.h

@@ -23,7 +23,7 @@
 #ifndef __XEN_GRANT_TABLE_H__
 #define __XEN_GRANT_TABLE_H__
 
-#include <xen/mm.h>
+#include <xen/mm-frame.h>
 #include <xen/rwlock.h>
 #include <public/grant_table.h>
 #include <asm/grant_table.h>

xen/include/xen/iommu.h

@@ -19,14 +19,13 @@
 #ifndef _IOMMU_H_
 #define _IOMMU_H_
 
+#include <xen/mm-frame.h>
 #include <xen/init.h>
 #include <xen/page-defs.h>
-#include <xen/spinlock.h>
 #include <xen/pci.h>
-#include <xen/typesafe.h>
-#include <xen/mm.h>
-#include <public/hvm/ioreq.h>
+#include <xen/spinlock.h>
 #include <public/domctl.h>
+#include <public/hvm/ioreq.h>
 #include <asm/device.h>
 
 TYPE_SAFE(uint64_t, dfn);

xen/include/xen/mm-frame.h

+#ifndef __XEN_FRAME_NUM_H__
+#define __XEN_FRAME_NUM_H__
+
+#include <xen/kernel.h>
+#include <xen/typesafe.h>
+
+TYPE_SAFE(unsigned long, mfn);
+#define PRI_mfn          "05lx"
+#define INVALID_MFN      _mfn(~0UL)
+/*
+ * To be used for global variable initialization. This workaround a bug
+ * in GCC < 5.0.
+ */
+#define INVALID_MFN_INITIALIZER { ~0UL }
+
+#ifndef mfn_t
+#define mfn_t /* Grep fodder: mfn_t, _mfn() and mfn_x() are defined above */
+#define _mfn
+#define mfn_x
+#undef mfn_t
+#undef _mfn
+#undef mfn_x
+#endif
+
+static inline mfn_t mfn_add(mfn_t mfn, unsigned long i)
+{
+    return _mfn(mfn_x(mfn) + i);
+}
+
+static inline mfn_t mfn_max(mfn_t x, mfn_t y)
+{
+    return _mfn(max(mfn_x(x), mfn_x(y)));
+}
+
+static inline mfn_t mfn_min(mfn_t x, mfn_t y)
+{
+    return _mfn(min(mfn_x(x), mfn_x(y)));
+}
+
+static inline bool_t mfn_eq(mfn_t x, mfn_t y)
+{
+    return mfn_x(x) == mfn_x(y);
+}
+
+TYPE_SAFE(unsigned long, gfn);
+#define PRI_gfn          "05lx"
+#define INVALID_GFN      _gfn(~0UL)
+/*
+ * To be used for global variable initialization. This workaround a bug
+ * in GCC < 5.0 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64856
+ */
+#define INVALID_GFN_INITIALIZER { ~0UL }
+
+#ifndef gfn_t
+#define gfn_t /* Grep fodder: gfn_t, _gfn() and gfn_x() are defined above */
+#define _gfn
+#define gfn_x
+#undef gfn_t
+#undef _gfn
+#undef gfn_x
+#endif
+
+static inline gfn_t gfn_add(gfn_t gfn, unsigned long i)
+{
+    return _gfn(gfn_x(gfn) + i);
+}
+
+static inline gfn_t gfn_max(gfn_t x, gfn_t y)
+{
+    return _gfn(max(gfn_x(x), gfn_x(y)));
+}
+
+static inline gfn_t gfn_min(gfn_t x, gfn_t y)
+{
+    return _gfn(min(gfn_x(x), gfn_x(y)));
+}
+
+static inline bool_t gfn_eq(gfn_t x, gfn_t y)
+{
+    return gfn_x(x) == gfn_x(y);
+}
+
+TYPE_SAFE(unsigned long, pfn);
+#define PRI_pfn          "05lx"
+#define INVALID_PFN      (~0UL)
+
+#ifndef pfn_t
+#define pfn_t /* Grep fodder: pfn_t, _pfn() and pfn_x() are defined above */
+#define _pfn
+#define pfn_x
+#undef pfn_t
+#undef _pfn
+#undef pfn_x
+#endif
+
+#endif /* __XEN_FRAME_NUM_H__ */

xen/include/xen/mm.h

@@ -51,103 +51,13 @@
 #define __XEN_MM_H__
 
 #include <xen/compiler.h>
+#include <xen/mm-frame.h>
 #include <xen/types.h>
 #include <xen/list.h>
 #include <xen/spinlock.h>
-#include <xen/typesafe.h>
-#include <xen/kernel.h>
 #include <xen/perfc.h>
 #include <public/memory.h>
 
-TYPE_SAFE(unsigned long, mfn);
-#define PRI_mfn          "05lx"
-#define INVALID_MFN      _mfn(~0UL)
-/*
- * To be used for global variable initialization. This workaround a bug
- * in GCC < 5.0.
- */
-#define INVALID_MFN_INITIALIZER { ~0UL }
-
-#ifndef mfn_t
-#define mfn_t /* Grep fodder: mfn_t, _mfn() and mfn_x() are defined above */
-#define _mfn
-#define mfn_x
-#undef mfn_t
-#undef _mfn
-#undef mfn_x
-#endif
-
-static inline mfn_t mfn_add(mfn_t mfn, unsigned long i)
-{
-    return _mfn(mfn_x(mfn) + i);
-}
-
-static inline mfn_t mfn_max(mfn_t x, mfn_t y)
-{
-    return _mfn(max(mfn_x(x), mfn_x(y)));
-}
-
-static inline mfn_t mfn_min(mfn_t x, mfn_t y)
-{
-    return _mfn(min(mfn_x(x), mfn_x(y)));
-}
-
-static inline bool_t mfn_eq(mfn_t x, mfn_t y)
-{
-    return mfn_x(x) == mfn_x(y);
-}
-
-TYPE_SAFE(unsigned long, gfn);
-#define PRI_gfn          "05lx"
-#define INVALID_GFN      _gfn(~0UL)
-/*
- * To be used for global variable initialization. This workaround a bug
- * in GCC < 5.0 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64856
- */
-#define INVALID_GFN_INITIALIZER { ~0UL }
-
-#ifndef gfn_t
-#define gfn_t /* Grep fodder: gfn_t, _gfn() and gfn_x() are defined above */
-#define _gfn
-#define gfn_x
-#undef gfn_t
-#undef _gfn
-#undef gfn_x
-#endif
-
-static inline gfn_t gfn_add(gfn_t gfn, unsigned long i)
-{
-    return _gfn(gfn_x(gfn) + i);
-}
-
-static inline gfn_t gfn_max(gfn_t x, gfn_t y)
-{
-    return _gfn(max(gfn_x(x), gfn_x(y)));
-}
-
-static inline gfn_t gfn_min(gfn_t x, gfn_t y)
-{
-    return _gfn(min(gfn_x(x), gfn_x(y)));
-}
-
-static inline bool_t gfn_eq(gfn_t x, gfn_t y)
-{
-    return gfn_x(x) == gfn_x(y);
-}
-
-TYPE_SAFE(unsigned long, pfn);
-#define PRI_pfn          "05lx"
-#define INVALID_PFN      (~0UL)
-
-#ifndef pfn_t
-#define pfn_t /* Grep fodder: pfn_t, _pfn() and pfn_x() are defined above */
-#define _pfn
-#define pfn_x
-#undef pfn_t
-#undef _pfn
-#undef pfn_x
-#endif
-
 struct page_info;
 
 void put_page(struct page_info *);

xen/include/xen/p2m-common.h

 #ifndef _XEN_P2M_COMMON_H
 #define _XEN_P2M_COMMON_H
 
-#include <xen/mm.h>
+#include <xen/mm-frame.h>
 
 /* Remove a page from a domain's p2m table */
 int __must_check

xen/include/xen/vmap.h

 #if !defined(__XEN_VMAP_H__) && defined(VMAP_VIRT_START)
 #define __XEN_VMAP_H__
 
-#include <xen/mm.h>
+#include <xen/mm-frame.h>
 #include <xen/page-size.h>
 
 enum vmap_region {