Merge tag 'armsoc-late' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc
[linux-2.6-block.git] / arch / s390 / mm / pageattr.c
... / ...
CommitLineData
1/*
2 * Copyright IBM Corp. 2011
3 * Author(s): Jan Glauber <jang@linux.vnet.ibm.com>
4 */
5#include <linux/hugetlb.h>
6#include <linux/module.h>
7#include <linux/mm.h>
8#include <asm/cacheflush.h>
9#include <asm/facility.h>
10#include <asm/pgtable.h>
11#include <asm/page.h>
12
13#if PAGE_DEFAULT_KEY
14static inline unsigned long sske_frame(unsigned long addr, unsigned char skey)
15{
16 asm volatile(".insn rrf,0xb22b0000,%[skey],%[addr],9,0"
17 : [addr] "+a" (addr) : [skey] "d" (skey));
18 return addr;
19}
20
21void __storage_key_init_range(unsigned long start, unsigned long end)
22{
23 unsigned long boundary, size;
24
25 while (start < end) {
26 if (MACHINE_HAS_EDAT1) {
27 /* set storage keys for a 1MB frame */
28 size = 1UL << 20;
29 boundary = (start + size) & ~(size - 1);
30 if (boundary <= end) {
31 do {
32 start = sske_frame(start, PAGE_DEFAULT_KEY);
33 } while (start < boundary);
34 continue;
35 }
36 }
37 page_set_storage_key(start, PAGE_DEFAULT_KEY, 0);
38 start += PAGE_SIZE;
39 }
40}
41#endif
42
43static pte_t *walk_page_table(unsigned long addr)
44{
45 pgd_t *pgdp;
46 pud_t *pudp;
47 pmd_t *pmdp;
48 pte_t *ptep;
49
50 pgdp = pgd_offset_k(addr);
51 if (pgd_none(*pgdp))
52 return NULL;
53 pudp = pud_offset(pgdp, addr);
54 if (pud_none(*pudp) || pud_large(*pudp))
55 return NULL;
56 pmdp = pmd_offset(pudp, addr);
57 if (pmd_none(*pmdp) || pmd_large(*pmdp))
58 return NULL;
59 ptep = pte_offset_kernel(pmdp, addr);
60 if (pte_none(*ptep))
61 return NULL;
62 return ptep;
63}
64
65static void change_page_attr(unsigned long addr, int numpages,
66 pte_t (*set) (pte_t))
67{
68 pte_t *ptep, pte;
69 int i;
70
71 for (i = 0; i < numpages; i++) {
72 ptep = walk_page_table(addr);
73 if (WARN_ON_ONCE(!ptep))
74 break;
75 pte = *ptep;
76 pte = set(pte);
77 __ptep_ipte(addr, ptep);
78 *ptep = pte;
79 addr += PAGE_SIZE;
80 }
81}
82
83int set_memory_ro(unsigned long addr, int numpages)
84{
85 change_page_attr(addr, numpages, pte_wrprotect);
86 return 0;
87}
88
89int set_memory_rw(unsigned long addr, int numpages)
90{
91 change_page_attr(addr, numpages, pte_mkwrite);
92 return 0;
93}
94
95/* not possible */
96int set_memory_nx(unsigned long addr, int numpages)
97{
98 return 0;
99}
100
101int set_memory_x(unsigned long addr, int numpages)
102{
103 return 0;
104}
105
106#ifdef CONFIG_DEBUG_PAGEALLOC
107
108static void ipte_range(pte_t *pte, unsigned long address, int nr)
109{
110 int i;
111
112 if (test_facility(13)) {
113 __ptep_ipte_range(address, nr - 1, pte);
114 return;
115 }
116 for (i = 0; i < nr; i++) {
117 __ptep_ipte(address, pte);
118 address += PAGE_SIZE;
119 pte++;
120 }
121}
122
123void __kernel_map_pages(struct page *page, int numpages, int enable)
124{
125 unsigned long address;
126 int nr, i, j;
127 pgd_t *pgd;
128 pud_t *pud;
129 pmd_t *pmd;
130 pte_t *pte;
131
132 for (i = 0; i < numpages;) {
133 address = page_to_phys(page + i);
134 pgd = pgd_offset_k(address);
135 pud = pud_offset(pgd, address);
136 pmd = pmd_offset(pud, address);
137 pte = pte_offset_kernel(pmd, address);
138 nr = (unsigned long)pte >> ilog2(sizeof(long));
139 nr = PTRS_PER_PTE - (nr & (PTRS_PER_PTE - 1));
140 nr = min(numpages - i, nr);
141 if (enable) {
142 for (j = 0; j < nr; j++) {
143 pte_val(*pte) = __pa(address);
144 address += PAGE_SIZE;
145 pte++;
146 }
147 } else {
148 ipte_range(pte, address, nr);
149 }
150 i += nr;
151 }
152}
153
154#ifdef CONFIG_HIBERNATION
155bool kernel_page_present(struct page *page)
156{
157 unsigned long addr;
158 int cc;
159
160 addr = page_to_phys(page);
161 asm volatile(
162 " lra %1,0(%1)\n"
163 " ipm %0\n"
164 " srl %0,28"
165 : "=d" (cc), "+a" (addr) : : "cc");
166 return cc == 0;
167}
168#endif /* CONFIG_HIBERNATION */
169
170#endif /* CONFIG_DEBUG_PAGEALLOC */