page-states.h

 1/* SPDX-License-Identifier: GPL-2.0 */
 2/*
 3 *    Copyright IBM Corp. 2017
 4 *    Author(s): Claudio Imbrenda <imbrenda@linux.vnet.ibm.com>
 5 */
 6
 7#ifndef PAGE_STATES_H
 8#define PAGE_STATES_H
 9
10#include <asm/page.h>
11
12#define ESSA_GET_STATE			0
13#define ESSA_SET_STABLE			1
14#define ESSA_SET_UNUSED			2
15#define ESSA_SET_VOLATILE		3
16#define ESSA_SET_POT_VOLATILE		4
17#define ESSA_SET_STABLE_RESIDENT	5
18#define ESSA_SET_STABLE_IF_RESIDENT	6
19#define ESSA_SET_STABLE_NODAT		7
20
21#define ESSA_MAX	ESSA_SET_STABLE_NODAT
22
23extern int cmma_flag;
24
25static __always_inline unsigned long essa(unsigned long paddr, unsigned char cmd)
26{
27	unsigned long rc;
28
29	asm volatile(
30		"	.insn	rrf,0xb9ab0000,%[rc],%[paddr],%[cmd],0"
31		: [rc] "=d" (rc)
32		: [paddr] "d" (paddr),
33		  [cmd] "i" (cmd));
34	return rc;
35}
36
37static __always_inline void __set_page_state(void *addr, unsigned long num_pages, unsigned char cmd)
38{
39	unsigned long paddr = __pa(addr) & PAGE_MASK;
40
41	while (num_pages--) {
42		essa(paddr, cmd);
43		paddr += PAGE_SIZE;
44	}
45}
46
47static inline void __set_page_unused(void *addr, unsigned long num_pages)
48{
49	__set_page_state(addr, num_pages, ESSA_SET_UNUSED);
50}
51
52static inline void __set_page_stable_dat(void *addr, unsigned long num_pages)
53{
54	__set_page_state(addr, num_pages, ESSA_SET_STABLE);
55}
56
57static inline void __set_page_stable_nodat(void *addr, unsigned long num_pages)
58{
59	__set_page_state(addr, num_pages, ESSA_SET_STABLE_NODAT);
60}
61
62static inline void __arch_set_page_nodat(void *addr, unsigned long num_pages)
63{
64	if (!cmma_flag)
65		return;
66	if (cmma_flag < 2)
67		__set_page_stable_dat(addr, num_pages);
68	else
69		__set_page_stable_nodat(addr, num_pages);
70}
71
72static inline void __arch_set_page_dat(void *addr, unsigned long num_pages)
73{
74	if (!cmma_flag)
75		return;
76	__set_page_stable_dat(addr, num_pages);
77}
78
79#endif