2 * IBM System z Huge TLB Page Support for Kernel.
4 * Copyright IBM Corp. 2008
5 * Author(s): Gerald Schaefer <gerald.schaefer@de.ibm.com>
8 #ifndef _ASM_S390_HUGETLB_H
9 #define _ASM_S390_HUGETLB_H
12 #include <asm/pgtable.h>
15 #define is_hugepage_only_range(mm, addr, len) 0
16 #define hugetlb_free_pgd_range free_pgd_range
18 void set_huge_pte_at(struct mm_struct
*mm
, unsigned long addr
,
19 pte_t
*ptep
, pte_t pte
);
22 * If the arch doesn't supply something else, assume that hugepage
23 * size aligned regions are ok without further preparation.
25 static inline int prepare_hugepage_range(struct file
*file
,
26 unsigned long addr
, unsigned long len
)
28 if (len
& ~HPAGE_MASK
)
30 if (addr
& ~HPAGE_MASK
)
35 #define hugetlb_prefault_arch_hook(mm) do { } while (0)
37 int arch_prepare_hugepage(struct page
*page
);
38 void arch_release_hugepage(struct page
*page
);
40 static inline pte_t
pte_mkhuge(pte_t pte
)
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.
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
;
54 * Clear SW pte bits SWT and SWX, there are no SW bits in a segment
57 pte_val(pte
) &= ~(_PAGE_SWT
| _PAGE_SWX
);
59 * Also set the change-override bit because we don't need dirty bit
60 * tracking for hugetlbfs pages.
62 pte_val(pte
) |= (_SEGMENT_ENTRY_LARGE
| _SEGMENT_ENTRY_CO
);
66 static inline pte_t
huge_pte_wrprotect(pte_t pte
)
68 pte_val(pte
) |= _PAGE_RO
;
72 static inline int huge_pte_none(pte_t pte
)
74 return (pte_val(pte
) & _SEGMENT_ENTRY_INV
) &&
75 !(pte_val(pte
) & _SEGMENT_ENTRY_RO
);
78 static inline pte_t
huge_ptep_get(pte_t
*ptep
)
83 if (!MACHINE_HAS_HPAGE
) {
84 ptep
= (pte_t
*) (pte_val(pte
) & _SEGMENT_ENTRY_ORIGIN
);
87 (_SEGMENT_ENTRY_INV
| _SEGMENT_ENTRY_RO
);
88 pte
= pte_mkhuge(*ptep
);
95 static inline pte_t
huge_ptep_get_and_clear(struct mm_struct
*mm
,
96 unsigned long addr
, pte_t
*ptep
)
98 pte_t pte
= huge_ptep_get(ptep
);
100 pmd_clear((pmd_t
*) ptep
);
104 static inline void __pmd_csp(pmd_t
*pmdp
)
106 register unsigned long reg2
asm("2") = pmd_val(*pmdp
);
107 register unsigned long reg3
asm("3") = pmd_val(*pmdp
) |
109 register unsigned long reg4
asm("4") = ((unsigned long) pmdp
) + 5;
114 : "d" (reg2
), "d" (reg3
), "d" (reg4
), "m" (*pmdp
) : "cc");
115 pmd_val(*pmdp
) = _SEGMENT_ENTRY_INV
| _SEGMENT_ENTRY
;
118 static inline void __pmd_idte(unsigned long address
, pmd_t
*pmdp
)
120 unsigned long sto
= (unsigned long) pmdp
-
121 pmd_index(address
) * sizeof(pmd_t
);
123 if (!(pmd_val(*pmdp
) & _SEGMENT_ENTRY_INV
)) {
125 " .insn rrf,0xb98e0000,%2,%3,0,0"
127 : "m" (*pmdp
), "a" (sto
),
128 "a" ((address
& HPAGE_MASK
))
131 pmd_val(*pmdp
) = _SEGMENT_ENTRY_INV
| _SEGMENT_ENTRY
;
134 static inline void huge_ptep_invalidate(struct mm_struct
*mm
,
135 unsigned long address
, pte_t
*ptep
)
137 pmd_t
*pmdp
= (pmd_t
*) ptep
;
139 if (!MACHINE_HAS_IDTE
) {
141 if (mm
->context
.noexec
) {
142 pmdp
= get_shadow_table(pmdp
);
148 __pmd_idte(address
, pmdp
);
149 if (mm
->context
.noexec
) {
150 pmdp
= get_shadow_table(pmdp
);
151 __pmd_idte(address
, pmdp
);
156 #define huge_ptep_set_access_flags(__vma, __addr, __ptep, __entry, __dirty) \
158 int __changed = !pte_same(huge_ptep_get(__ptep), __entry); \
160 huge_ptep_invalidate((__vma)->vm_mm, __addr, __ptep); \
161 set_huge_pte_at((__vma)->vm_mm, __addr, __ptep, __entry); \
166 #define huge_ptep_set_wrprotect(__mm, __addr, __ptep) \
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)); \
178 static inline void huge_ptep_clear_flush(struct vm_area_struct
*vma
,
179 unsigned long address
, pte_t
*ptep
)
181 huge_ptep_invalidate(vma
->vm_mm
, address
, ptep
);
184 #endif /* _ASM_S390_HUGETLB_H */
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