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-rw-r--r--include/asm-s390/hugetlb.h184
1 files changed, 0 insertions, 184 deletions
diff --git a/include/asm-s390/hugetlb.h b/include/asm-s390/hugetlb.h
deleted file mode 100644
index 670a1d1745d2..000000000000
--- a/include/asm-s390/hugetlb.h
+++ /dev/null
@@ -1,184 +0,0 @@
1/*
2 * IBM System z Huge TLB Page Support for Kernel.
3 *
4 * Copyright IBM Corp. 2008
5 * Author(s): Gerald Schaefer <gerald.schaefer@de.ibm.com>
6 */
7
8#ifndef _ASM_S390_HUGETLB_H
9#define _ASM_S390_HUGETLB_H
10
11#include <asm/page.h>
12#include <asm/pgtable.h>
13
14
15#define is_hugepage_only_range(mm, addr, len) 0
16#define hugetlb_free_pgd_range free_pgd_range
17
18void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
19 pte_t *ptep, pte_t pte);
20
21/*
22 * If the arch doesn't supply something else, assume that hugepage
23 * size aligned regions are ok without further preparation.
24 */
25static inline int prepare_hugepage_range(struct file *file,
26 unsigned long addr, unsigned long len)
27{
28 if (len & ~HPAGE_MASK)
29 return -EINVAL;
30 if (addr & ~HPAGE_MASK)
31 return -EINVAL;
32 return 0;
33}
34
35#define hugetlb_prefault_arch_hook(mm) do { } while (0)
36
37int arch_prepare_hugepage(struct page *page);
38void arch_release_hugepage(struct page *page);
39
40static inline pte_t pte_mkhuge(pte_t pte)
41{
42 /*
43 * PROT_NONE needs to be remapped from the pte type to the ste type.
44 * The HW invalid bit is also different for pte and ste. The pte
45 * invalid bit happens to be the same as the ste _SEGMENT_ENTRY_LARGE
46 * bit, so we don't have to clear it.
47 */
48 if (pte_val(pte) & _PAGE_INVALID) {
49 if (pte_val(pte) & _PAGE_SWT)
50 pte_val(pte) |= _HPAGE_TYPE_NONE;
51 pte_val(pte) |= _SEGMENT_ENTRY_INV;
52 }
53 /*
54 * Clear SW pte bits SWT and SWX, there are no SW bits in a segment
55 * table entry.
56 */
57 pte_val(pte) &= ~(_PAGE_SWT | _PAGE_SWX);
58 /*
59 * Also set the change-override bit because we don't need dirty bit
60 * tracking for hugetlbfs pages.
61 */
62 pte_val(pte) |= (_SEGMENT_ENTRY_LARGE | _SEGMENT_ENTRY_CO);
63 return pte;
64}
65
66static inline pte_t huge_pte_wrprotect(pte_t pte)
67{
68 pte_val(pte) |= _PAGE_RO;
69 return pte;
70}
71
72static inline int huge_pte_none(pte_t pte)
73{
74 return (pte_val(pte) & _SEGMENT_ENTRY_INV) &&
75 !(pte_val(pte) & _SEGMENT_ENTRY_RO);
76}
77
78static inline pte_t huge_ptep_get(pte_t *ptep)
79{
80 pte_t pte = *ptep;
81 unsigned long mask;
82
83 if (!MACHINE_HAS_HPAGE) {
84 ptep = (pte_t *) (pte_val(pte) & _SEGMENT_ENTRY_ORIGIN);
85 if (ptep) {
86 mask = pte_val(pte) &
87 (_SEGMENT_ENTRY_INV | _SEGMENT_ENTRY_RO);
88 pte = pte_mkhuge(*ptep);
89 pte_val(pte) |= mask;
90 }
91 }
92 return pte;
93}
94
95static inline pte_t huge_ptep_get_and_clear(struct mm_struct *mm,
96 unsigned long addr, pte_t *ptep)
97{
98 pte_t pte = huge_ptep_get(ptep);
99
100 pmd_clear((pmd_t *) ptep);
101 return pte;
102}
103
104static inline void __pmd_csp(pmd_t *pmdp)
105{
106 register unsigned long reg2 asm("2") = pmd_val(*pmdp);
107 register unsigned long reg3 asm("3") = pmd_val(*pmdp) |
108 _SEGMENT_ENTRY_INV;
109 register unsigned long reg4 asm("4") = ((unsigned long) pmdp) + 5;
110
111 asm volatile(
112 " csp %1,%3"
113 : "=m" (*pmdp)
114 : "d" (reg2), "d" (reg3), "d" (reg4), "m" (*pmdp) : "cc");
115 pmd_val(*pmdp) = _SEGMENT_ENTRY_INV | _SEGMENT_ENTRY;
116}
117
118static inline void __pmd_idte(unsigned long address, pmd_t *pmdp)
119{
120 unsigned long sto = (unsigned long) pmdp -
121 pmd_index(address) * sizeof(pmd_t);
122
123 if (!(pmd_val(*pmdp) & _SEGMENT_ENTRY_INV)) {
124 asm volatile(
125 " .insn rrf,0xb98e0000,%2,%3,0,0"
126 : "=m" (*pmdp)
127 : "m" (*pmdp), "a" (sto),
128 "a" ((address & HPAGE_MASK))
129 );
130 }
131 pmd_val(*pmdp) = _SEGMENT_ENTRY_INV | _SEGMENT_ENTRY;
132}
133
134static inline void huge_ptep_invalidate(struct mm_struct *mm,
135 unsigned long address, pte_t *ptep)
136{
137 pmd_t *pmdp = (pmd_t *) ptep;
138
139 if (!MACHINE_HAS_IDTE) {
140 __pmd_csp(pmdp);
141 if (mm->context.noexec) {
142 pmdp = get_shadow_table(pmdp);
143 __pmd_csp(pmdp);
144 }
145 return;
146 }
147
148 __pmd_idte(address, pmdp);
149 if (mm->context.noexec) {
150 pmdp = get_shadow_table(pmdp);
151 __pmd_idte(address, pmdp);
152 }
153 return;
154}
155
156#define huge_ptep_set_access_flags(__vma, __addr, __ptep, __entry, __dirty) \
157({ \
158 int __changed = !pte_same(huge_ptep_get(__ptep), __entry); \
159 if (__changed) { \
160 huge_ptep_invalidate((__vma)->vm_mm, __addr, __ptep); \
161 set_huge_pte_at((__vma)->vm_mm, __addr, __ptep, __entry); \
162 } \
163 __changed; \
164})
165
166#define huge_ptep_set_wrprotect(__mm, __addr, __ptep) \
167({ \
168 pte_t __pte = huge_ptep_get(__ptep); \
169 if (pte_write(__pte)) { \
170 if (atomic_read(&(__mm)->mm_users) > 1 || \
171 (__mm) != current->active_mm) \
172 huge_ptep_invalidate(__mm, __addr, __ptep); \
173 set_huge_pte_at(__mm, __addr, __ptep, \
174 huge_pte_wrprotect(__pte)); \
175 } \
176})
177
178static inline void huge_ptep_clear_flush(struct vm_area_struct *vma,
179 unsigned long address, pte_t *ptep)
180{
181 huge_ptep_invalidate(vma->vm_mm, address, ptep);
182}
183
184#endif /* _ASM_S390_HUGETLB_H */
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