powerpc/pseries: Move mm/book3s64/vphn.c under platforms/pseries/

hcall_vphn() is specific to pseries and will be used in a subsequent
patch. So, move it to a more appropriate place under
arch/powerpc/platforms/pseries. Also merge vphn.h into lppaca.h
and update vphn selftest to use the new files.

Signed-off-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

arch/powerpc/include/asm/lppaca.h

@@ -18,6 +18,29 @@
  */
 #ifndef _ASM_POWERPC_LPPACA_H
 #define _ASM_POWERPC_LPPACA_H
+
+/*
+ * The below VPHN macros are outside the __KERNEL__ check since these are
+ * used for compiling the vphn selftest in userspace
+ */
+
+/* The H_HOME_NODE_ASSOCIATIVITY h_call returns 6 64-bit registers. */
+#define VPHN_REGISTER_COUNT 6
+
+/*
+ * 6 64-bit registers unpacked into up to 24 be32 associativity values. To
+ * form the complete property we have to add the length in the first cell.
+ */
+#define VPHN_ASSOC_BUFSIZE (VPHN_REGISTER_COUNT*sizeof(u64)/sizeof(u16) + 1)
+
+/*
+ * The H_HOME_NODE_ASSOCIATIVITY hcall takes two values for flags:
+ * 1 for retrieving associativity information for a guest cpu
+ * 2 for retrieving associativity information for a host/hypervisor cpu
+ */
+#define VPHN_FLAG_VCPU	1
+#define VPHN_FLAG_PCPU	2
+
 #ifdef __KERNEL__
 
 /*
@@ -179,6 +202,7 @@ extern void (*dtl_consumer)(struct dtl_entry *entry, u64 index);
 
 extern void register_dtl_buffer(int cpu);
 extern void alloc_dtl_buffers(void);
+extern long hcall_vphn(unsigned long cpu, u64 flags, __be32 *associativity);
 
 #endif /* CONFIG_PPC_BOOK3S */
 #endif /* __KERNEL__ */

arch/powerpc/mm/book3s64/Makefile

@@ -10,7 +10,6 @@ obj-$(CONFIG_PPC_NATIVE)	+= hash_native.o
 obj-$(CONFIG_PPC_RADIX_MMU)	+= radix_pgtable.o radix_tlb.o
 obj-$(CONFIG_PPC_4K_PAGES)	+= hash_4k.o
 obj-$(CONFIG_PPC_64K_PAGES)	+= hash_64k.o
-obj-$(CONFIG_PPC_SPLPAR)	+= vphn.o
 obj-$(CONFIG_HUGETLB_PAGE)	+= hash_hugetlbpage.o
 ifdef CONFIG_HUGETLB_PAGE
 obj-$(CONFIG_PPC_RADIX_MMU)	+= radix_hugetlbpage.o

arch/powerpc/mm/book3s64/vphn.h

@@ -1,24 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-#ifndef _ARCH_POWERPC_MM_VPHN_H_
-#define _ARCH_POWERPC_MM_VPHN_H_
-
-/* The H_HOME_NODE_ASSOCIATIVITY h_call returns 6 64-bit registers. */
-#define VPHN_REGISTER_COUNT 6
-
-/*
- * 6 64-bit registers unpacked into up to 24 be32 associativity values. To
- * form the complete property we have to add the length in the first cell.
- */
-#define VPHN_ASSOC_BUFSIZE (VPHN_REGISTER_COUNT*sizeof(u64)/sizeof(u16) + 1)
-
-/*
- * The H_HOME_NODE_ASSOCIATIVITY hcall takes two values for flags:
- * 1 for retrieving associativity information for a guest cpu
- * 2 for retrieving associativity information for a host/hypervisor cpu
- */
-#define VPHN_FLAG_VCPU	1
-#define VPHN_FLAG_PCPU	2
-
-extern int vphn_unpack_associativity(const long *packed, __be32 *unpacked);
-
-#endif

arch/powerpc/mm/numa.c

@@ -1067,9 +1067,6 @@ u64 memory_hotplug_max(void)
 
 /* Virtual Processor Home Node (VPHN) support */
 #ifdef CONFIG_PPC_SPLPAR
-
-#include "book3s64/vphn.h"
-
 struct topology_update_data {
 	struct topology_update_data *next;
 	unsigned int cpu;
@@ -1087,17 +1084,6 @@ static void reset_topology_timer(void);
 static int topology_timer_secs = 1;
 static int topology_inited;
 
-static long hcall_vphn(unsigned long cpu, u64 flags, __be32 *associativity)
-{
-	long rc;
-	long retbuf[PLPAR_HCALL9_BUFSIZE] = {0};
-
-	rc = plpar_hcall9(H_HOME_NODE_ASSOCIATIVITY, retbuf, flags, cpu);
-	vphn_unpack_associativity(retbuf, associativity);
-
-	return rc;
-}
-
 /*
  * Change polling interval for associativity changes.
  */

arch/powerpc/platforms/pseries/Makefile

@@ -25,6 +25,7 @@ obj-$(CONFIG_LPARCFG)		+= lparcfg.o
 obj-$(CONFIG_IBMVIO)		+= vio.o
 obj-$(CONFIG_IBMEBUS)		+= ibmebus.o
 obj-$(CONFIG_PAPR_SCM)		+= papr_scm.o
+obj-$(CONFIG_PPC_SPLPAR)	+= vphn.o
 
 ifdef CONFIG_PPC_PSERIES
 obj-$(CONFIG_SUSPEND)		+= suspend.o

arch/powerpc/platforms/pseries/vphn.c

@@ -1,6 +1,6 @@
 // SPDX-License-Identifier: GPL-2.0
 #include <asm/byteorder.h>
-#include "vphn.h"
+#include <asm/lppaca.h>
 
 /*
  * The associativity domain numbers are returned from the hypervisor as a
@@ -22,7 +22,7 @@
  *
  * Convert to the sequence they would appear in the ibm,associativity property.
  */
-int vphn_unpack_associativity(const long *packed, __be32 *unpacked)
+static int vphn_unpack_associativity(const long *packed, __be32 *unpacked)
 {
 	__be64 be_packed[VPHN_REGISTER_COUNT];
 	int i, nr_assoc_doms = 0;
@@ -71,3 +71,19 @@ int vphn_unpack_associativity(const long *packed, __be32 *unpacked)
 
 	return nr_assoc_doms;
 }
+
+/* NOTE: This file is included by a selftest and built in userspace. */
+#ifdef __KERNEL__
+#include <asm/hvcall.h>
+
+long hcall_vphn(unsigned long cpu, u64 flags, __be32 *associativity)
+{
+	long rc;
+	long retbuf[PLPAR_HCALL9_BUFSIZE] = {0};
+
+	rc = plpar_hcall9(H_HOME_NODE_ASSOCIATIVITY, retbuf, flags, cpu);
+	vphn_unpack_associativity(retbuf, associativity);
+
+	return rc;
+}
+#endif

tools/testing/selftests/powerpc/vphn/Makefile

@@ -1,7 +1,7 @@
 # SPDX-License-Identifier: GPL-2.0-only
 TEST_GEN_PROGS := test-vphn
 
-CFLAGS += -m64
+CFLAGS += -m64 -I$(CURDIR)
 
 top_srcdir = ../../../../..
 include ../../lib.mk

tools/testing/selftests/powerpc/vphn/asm/lppaca.h

@@ -0,0 +1 @@
+../../../../../../arch/powerpc/include/asm/lppaca.h

tools/testing/selftests/powerpc/vphn/vphn.c

@@ -1 +1 @@
-../../../../../arch/powerpc/mm/book3s64/vphn.c
+../../../../../arch/powerpc/platforms/pseries/vphn.c

tools/testing/selftests/powerpc/vphn/vphn.h

@@ -1 +0,0 @@
-../../../../../arch/powerpc/mm/book3s64/vphn.h