1 files changed, 79 insertions, 0 deletions
diff --git a/arch/s390/include/asm/page-states.h b/arch/s390/include/asm/page-states.h
new file mode 100644
index 000000000000..794fdb21500a
--- /dev/null
+++ b/arch/s390/include/asm/page-states.h
@@ -0,0 +1,79 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ *    Copyright IBM Corp. 2017
+ *    Author(s): Claudio Imbrenda <imbrenda@linux.vnet.ibm.com>
+ */
+
+#ifndef PAGE_STATES_H
+#define PAGE_STATES_H
+
+#include <asm/page.h>
+
+#define ESSA_GET_STATE			0
+#define ESSA_SET_STABLE			1
+#define ESSA_SET_UNUSED			2
+#define ESSA_SET_VOLATILE		3
+#define ESSA_SET_POT_VOLATILE		4
+#define ESSA_SET_STABLE_RESIDENT	5
+#define ESSA_SET_STABLE_IF_RESIDENT	6
+#define ESSA_SET_STABLE_NODAT		7
+
+#define ESSA_MAX	ESSA_SET_STABLE_NODAT
+
+extern int cmma_flag;
+
+static __always_inline unsigned long essa(unsigned long paddr, unsigned char cmd)
+{
+	unsigned long rc;
+
+	asm volatile(
+		"	.insn	rrf,0xb9ab0000,%[rc],%[paddr],%[cmd],0"
+		: [rc] "=d" (rc)
+		: [paddr] "d" (paddr),
+		  [cmd] "i" (cmd));
+	return rc;
+}
+
+static __always_inline void __set_page_state(void *addr, unsigned long num_pages, unsigned char cmd)
+{
+	unsigned long paddr = __pa(addr) & PAGE_MASK;
+
+	while (num_pages--) {
+		essa(paddr, cmd);
+		paddr += PAGE_SIZE;
+	}
+}
+
+static inline void __set_page_unused(void *addr, unsigned long num_pages)
+{
+	__set_page_state(addr, num_pages, ESSA_SET_UNUSED);
+}
+
+static inline void __set_page_stable_dat(void *addr, unsigned long num_pages)
+{
+	__set_page_state(addr, num_pages, ESSA_SET_STABLE);
+}
+
+static inline void __set_page_stable_nodat(void *addr, unsigned long num_pages)
+{
+	__set_page_state(addr, num_pages, ESSA_SET_STABLE_NODAT);
+}
+
+static inline void __arch_set_page_nodat(void *addr, unsigned long num_pages)
+{
+	if (!cmma_flag)
+		return;
+	if (cmma_flag < 2)
+		__set_page_stable_dat(addr, num_pages);
+	else
+		__set_page_stable_nodat(addr, num_pages);
+}
+
+static inline void __arch_set_page_dat(void *addr, unsigned long num_pages)
+{
+	if (!cmma_flag)
+		return;
+	__set_page_stable_dat(addr, num_pages);
+}
+
+#endif