Loading...
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * IBM System z Huge TLB Page Support for Kernel.
4 *
5 * Copyright IBM Corp. 2007,2020
6 * Author(s): Gerald Schaefer <gerald.schaefer@de.ibm.com>
7 */
8
9#define KMSG_COMPONENT "hugetlb"
10#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
11
12#include <asm/pgalloc.h>
13#include <linux/mm.h>
14#include <linux/hugetlb.h>
15#include <linux/mman.h>
16#include <linux/sched/mm.h>
17#include <linux/security.h>
18
19/*
20 * If the bit selected by single-bit bitmask "a" is set within "x", move
21 * it to the position indicated by single-bit bitmask "b".
22 */
23#define move_set_bit(x, a, b) (((x) & (a)) >> ilog2(a) << ilog2(b))
24
25static inline unsigned long __pte_to_rste(pte_t pte)
26{
27 unsigned long rste;
28
29 /*
30 * Convert encoding pte bits pmd / pud bits
31 * lIR.uswrdy.p dy..R...I...wr
32 * empty 010.000000.0 -> 00..0...1...00
33 * prot-none, clean, old 111.000000.1 -> 00..1...1...00
34 * prot-none, clean, young 111.000001.1 -> 01..1...1...00
35 * prot-none, dirty, old 111.000010.1 -> 10..1...1...00
36 * prot-none, dirty, young 111.000011.1 -> 11..1...1...00
37 * read-only, clean, old 111.000100.1 -> 00..1...1...01
38 * read-only, clean, young 101.000101.1 -> 01..1...0...01
39 * read-only, dirty, old 111.000110.1 -> 10..1...1...01
40 * read-only, dirty, young 101.000111.1 -> 11..1...0...01
41 * read-write, clean, old 111.001100.1 -> 00..1...1...11
42 * read-write, clean, young 101.001101.1 -> 01..1...0...11
43 * read-write, dirty, old 110.001110.1 -> 10..0...1...11
44 * read-write, dirty, young 100.001111.1 -> 11..0...0...11
45 * HW-bits: R read-only, I invalid
46 * SW-bits: p present, y young, d dirty, r read, w write, s special,
47 * u unused, l large
48 */
49 if (pte_present(pte)) {
50 rste = pte_val(pte) & PAGE_MASK;
51 rste |= move_set_bit(pte_val(pte), _PAGE_READ,
52 _SEGMENT_ENTRY_READ);
53 rste |= move_set_bit(pte_val(pte), _PAGE_WRITE,
54 _SEGMENT_ENTRY_WRITE);
55 rste |= move_set_bit(pte_val(pte), _PAGE_INVALID,
56 _SEGMENT_ENTRY_INVALID);
57 rste |= move_set_bit(pte_val(pte), _PAGE_PROTECT,
58 _SEGMENT_ENTRY_PROTECT);
59 rste |= move_set_bit(pte_val(pte), _PAGE_DIRTY,
60 _SEGMENT_ENTRY_DIRTY);
61 rste |= move_set_bit(pte_val(pte), _PAGE_YOUNG,
62 _SEGMENT_ENTRY_YOUNG);
63#ifdef CONFIG_MEM_SOFT_DIRTY
64 rste |= move_set_bit(pte_val(pte), _PAGE_SOFT_DIRTY,
65 _SEGMENT_ENTRY_SOFT_DIRTY);
66#endif
67 rste |= move_set_bit(pte_val(pte), _PAGE_NOEXEC,
68 _SEGMENT_ENTRY_NOEXEC);
69 } else
70 rste = _SEGMENT_ENTRY_EMPTY;
71 return rste;
72}
73
74static inline pte_t __rste_to_pte(unsigned long rste)
75{
76 unsigned long pteval;
77 int present;
78
79 if ((rste & _REGION_ENTRY_TYPE_MASK) == _REGION_ENTRY_TYPE_R3)
80 present = pud_present(__pud(rste));
81 else
82 present = pmd_present(__pmd(rste));
83
84 /*
85 * Convert encoding pmd / pud bits pte bits
86 * dy..R...I...wr lIR.uswrdy.p
87 * empty 00..0...1...00 -> 010.000000.0
88 * prot-none, clean, old 00..1...1...00 -> 111.000000.1
89 * prot-none, clean, young 01..1...1...00 -> 111.000001.1
90 * prot-none, dirty, old 10..1...1...00 -> 111.000010.1
91 * prot-none, dirty, young 11..1...1...00 -> 111.000011.1
92 * read-only, clean, old 00..1...1...01 -> 111.000100.1
93 * read-only, clean, young 01..1...0...01 -> 101.000101.1
94 * read-only, dirty, old 10..1...1...01 -> 111.000110.1
95 * read-only, dirty, young 11..1...0...01 -> 101.000111.1
96 * read-write, clean, old 00..1...1...11 -> 111.001100.1
97 * read-write, clean, young 01..1...0...11 -> 101.001101.1
98 * read-write, dirty, old 10..0...1...11 -> 110.001110.1
99 * read-write, dirty, young 11..0...0...11 -> 100.001111.1
100 * HW-bits: R read-only, I invalid
101 * SW-bits: p present, y young, d dirty, r read, w write, s special,
102 * u unused, l large
103 */
104 if (present) {
105 pteval = rste & _SEGMENT_ENTRY_ORIGIN_LARGE;
106 pteval |= _PAGE_LARGE | _PAGE_PRESENT;
107 pteval |= move_set_bit(rste, _SEGMENT_ENTRY_READ, _PAGE_READ);
108 pteval |= move_set_bit(rste, _SEGMENT_ENTRY_WRITE, _PAGE_WRITE);
109 pteval |= move_set_bit(rste, _SEGMENT_ENTRY_INVALID, _PAGE_INVALID);
110 pteval |= move_set_bit(rste, _SEGMENT_ENTRY_PROTECT, _PAGE_PROTECT);
111 pteval |= move_set_bit(rste, _SEGMENT_ENTRY_DIRTY, _PAGE_DIRTY);
112 pteval |= move_set_bit(rste, _SEGMENT_ENTRY_YOUNG, _PAGE_YOUNG);
113#ifdef CONFIG_MEM_SOFT_DIRTY
114 pteval |= move_set_bit(rste, _SEGMENT_ENTRY_SOFT_DIRTY, _PAGE_SOFT_DIRTY);
115#endif
116 pteval |= move_set_bit(rste, _SEGMENT_ENTRY_NOEXEC, _PAGE_NOEXEC);
117 } else
118 pteval = _PAGE_INVALID;
119 return __pte(pteval);
120}
121
122static void clear_huge_pte_skeys(struct mm_struct *mm, unsigned long rste)
123{
124 struct page *page;
125 unsigned long size, paddr;
126
127 if (!mm_uses_skeys(mm) ||
128 rste & _SEGMENT_ENTRY_INVALID)
129 return;
130
131 if ((rste & _REGION_ENTRY_TYPE_MASK) == _REGION_ENTRY_TYPE_R3) {
132 page = pud_page(__pud(rste));
133 size = PUD_SIZE;
134 paddr = rste & PUD_MASK;
135 } else {
136 page = pmd_page(__pmd(rste));
137 size = PMD_SIZE;
138 paddr = rste & PMD_MASK;
139 }
140
141 if (!test_and_set_bit(PG_arch_1, &page->flags))
142 __storage_key_init_range(paddr, paddr + size - 1);
143}
144
145void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
146 pte_t *ptep, pte_t pte)
147{
148 unsigned long rste;
149
150 rste = __pte_to_rste(pte);
151 if (!MACHINE_HAS_NX)
152 rste &= ~_SEGMENT_ENTRY_NOEXEC;
153
154 /* Set correct table type for 2G hugepages */
155 if ((pte_val(*ptep) & _REGION_ENTRY_TYPE_MASK) == _REGION_ENTRY_TYPE_R3) {
156 if (likely(pte_present(pte)))
157 rste |= _REGION3_ENTRY_LARGE;
158 rste |= _REGION_ENTRY_TYPE_R3;
159 } else if (likely(pte_present(pte)))
160 rste |= _SEGMENT_ENTRY_LARGE;
161
162 clear_huge_pte_skeys(mm, rste);
163 set_pte(ptep, __pte(rste));
164}
165
166pte_t huge_ptep_get(pte_t *ptep)
167{
168 return __rste_to_pte(pte_val(*ptep));
169}
170
171pte_t huge_ptep_get_and_clear(struct mm_struct *mm,
172 unsigned long addr, pte_t *ptep)
173{
174 pte_t pte = huge_ptep_get(ptep);
175 pmd_t *pmdp = (pmd_t *) ptep;
176 pud_t *pudp = (pud_t *) ptep;
177
178 if ((pte_val(*ptep) & _REGION_ENTRY_TYPE_MASK) == _REGION_ENTRY_TYPE_R3)
179 pudp_xchg_direct(mm, addr, pudp, __pud(_REGION3_ENTRY_EMPTY));
180 else
181 pmdp_xchg_direct(mm, addr, pmdp, __pmd(_SEGMENT_ENTRY_EMPTY));
182 return pte;
183}
184
185pte_t *huge_pte_alloc(struct mm_struct *mm, struct vm_area_struct *vma,
186 unsigned long addr, unsigned long sz)
187{
188 pgd_t *pgdp;
189 p4d_t *p4dp;
190 pud_t *pudp;
191 pmd_t *pmdp = NULL;
192
193 pgdp = pgd_offset(mm, addr);
194 p4dp = p4d_alloc(mm, pgdp, addr);
195 if (p4dp) {
196 pudp = pud_alloc(mm, p4dp, addr);
197 if (pudp) {
198 if (sz == PUD_SIZE)
199 return (pte_t *) pudp;
200 else if (sz == PMD_SIZE)
201 pmdp = pmd_alloc(mm, pudp, addr);
202 }
203 }
204 return (pte_t *) pmdp;
205}
206
207pte_t *huge_pte_offset(struct mm_struct *mm,
208 unsigned long addr, unsigned long sz)
209{
210 pgd_t *pgdp;
211 p4d_t *p4dp;
212 pud_t *pudp;
213 pmd_t *pmdp = NULL;
214
215 pgdp = pgd_offset(mm, addr);
216 if (pgd_present(*pgdp)) {
217 p4dp = p4d_offset(pgdp, addr);
218 if (p4d_present(*p4dp)) {
219 pudp = pud_offset(p4dp, addr);
220 if (pud_present(*pudp)) {
221 if (pud_large(*pudp))
222 return (pte_t *) pudp;
223 pmdp = pmd_offset(pudp, addr);
224 }
225 }
226 }
227 return (pte_t *) pmdp;
228}
229
230int pmd_huge(pmd_t pmd)
231{
232 return pmd_large(pmd);
233}
234
235int pud_huge(pud_t pud)
236{
237 return pud_large(pud);
238}
239
240bool __init arch_hugetlb_valid_size(unsigned long size)
241{
242 if (MACHINE_HAS_EDAT1 && size == PMD_SIZE)
243 return true;
244 else if (MACHINE_HAS_EDAT2 && size == PUD_SIZE)
245 return true;
246 else
247 return false;
248}
249
250static unsigned long hugetlb_get_unmapped_area_bottomup(struct file *file,
251 unsigned long addr, unsigned long len,
252 unsigned long pgoff, unsigned long flags)
253{
254 struct hstate *h = hstate_file(file);
255 struct vm_unmapped_area_info info;
256
257 info.flags = 0;
258 info.length = len;
259 info.low_limit = current->mm->mmap_base;
260 info.high_limit = TASK_SIZE;
261 info.align_mask = PAGE_MASK & ~huge_page_mask(h);
262 info.align_offset = 0;
263 return vm_unmapped_area(&info);
264}
265
266static unsigned long hugetlb_get_unmapped_area_topdown(struct file *file,
267 unsigned long addr0, unsigned long len,
268 unsigned long pgoff, unsigned long flags)
269{
270 struct hstate *h = hstate_file(file);
271 struct vm_unmapped_area_info info;
272 unsigned long addr;
273
274 info.flags = VM_UNMAPPED_AREA_TOPDOWN;
275 info.length = len;
276 info.low_limit = max(PAGE_SIZE, mmap_min_addr);
277 info.high_limit = current->mm->mmap_base;
278 info.align_mask = PAGE_MASK & ~huge_page_mask(h);
279 info.align_offset = 0;
280 addr = vm_unmapped_area(&info);
281
282 /*
283 * A failed mmap() very likely causes application failure,
284 * so fall back to the bottom-up function here. This scenario
285 * can happen with large stack limits and large mmap()
286 * allocations.
287 */
288 if (addr & ~PAGE_MASK) {
289 VM_BUG_ON(addr != -ENOMEM);
290 info.flags = 0;
291 info.low_limit = TASK_UNMAPPED_BASE;
292 info.high_limit = TASK_SIZE;
293 addr = vm_unmapped_area(&info);
294 }
295
296 return addr;
297}
298
299unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
300 unsigned long len, unsigned long pgoff, unsigned long flags)
301{
302 struct hstate *h = hstate_file(file);
303 struct mm_struct *mm = current->mm;
304 struct vm_area_struct *vma;
305
306 if (len & ~huge_page_mask(h))
307 return -EINVAL;
308 if (len > TASK_SIZE - mmap_min_addr)
309 return -ENOMEM;
310
311 if (flags & MAP_FIXED) {
312 if (prepare_hugepage_range(file, addr, len))
313 return -EINVAL;
314 goto check_asce_limit;
315 }
316
317 if (addr) {
318 addr = ALIGN(addr, huge_page_size(h));
319 vma = find_vma(mm, addr);
320 if (TASK_SIZE - len >= addr && addr >= mmap_min_addr &&
321 (!vma || addr + len <= vm_start_gap(vma)))
322 goto check_asce_limit;
323 }
324
325 if (mm->get_unmapped_area == arch_get_unmapped_area)
326 addr = hugetlb_get_unmapped_area_bottomup(file, addr, len,
327 pgoff, flags);
328 else
329 addr = hugetlb_get_unmapped_area_topdown(file, addr, len,
330 pgoff, flags);
331 if (offset_in_page(addr))
332 return addr;
333
334check_asce_limit:
335 return check_asce_limit(mm, addr, len);
336}
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * IBM System z Huge TLB Page Support for Kernel.
4 *
5 * Copyright IBM Corp. 2007,2016
6 * Author(s): Gerald Schaefer <gerald.schaefer@de.ibm.com>
7 */
8
9#define KMSG_COMPONENT "hugetlb"
10#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
11
12#include <linux/mm.h>
13#include <linux/hugetlb.h>
14
15/*
16 * If the bit selected by single-bit bitmask "a" is set within "x", move
17 * it to the position indicated by single-bit bitmask "b".
18 */
19#define move_set_bit(x, a, b) (((x) & (a)) >> ilog2(a) << ilog2(b))
20
21static inline unsigned long __pte_to_rste(pte_t pte)
22{
23 unsigned long rste;
24
25 /*
26 * Convert encoding pte bits pmd / pud bits
27 * lIR.uswrdy.p dy..R...I...wr
28 * empty 010.000000.0 -> 00..0...1...00
29 * prot-none, clean, old 111.000000.1 -> 00..1...1...00
30 * prot-none, clean, young 111.000001.1 -> 01..1...1...00
31 * prot-none, dirty, old 111.000010.1 -> 10..1...1...00
32 * prot-none, dirty, young 111.000011.1 -> 11..1...1...00
33 * read-only, clean, old 111.000100.1 -> 00..1...1...01
34 * read-only, clean, young 101.000101.1 -> 01..1...0...01
35 * read-only, dirty, old 111.000110.1 -> 10..1...1...01
36 * read-only, dirty, young 101.000111.1 -> 11..1...0...01
37 * read-write, clean, old 111.001100.1 -> 00..1...1...11
38 * read-write, clean, young 101.001101.1 -> 01..1...0...11
39 * read-write, dirty, old 110.001110.1 -> 10..0...1...11
40 * read-write, dirty, young 100.001111.1 -> 11..0...0...11
41 * HW-bits: R read-only, I invalid
42 * SW-bits: p present, y young, d dirty, r read, w write, s special,
43 * u unused, l large
44 */
45 if (pte_present(pte)) {
46 rste = pte_val(pte) & PAGE_MASK;
47 rste |= move_set_bit(pte_val(pte), _PAGE_READ,
48 _SEGMENT_ENTRY_READ);
49 rste |= move_set_bit(pte_val(pte), _PAGE_WRITE,
50 _SEGMENT_ENTRY_WRITE);
51 rste |= move_set_bit(pte_val(pte), _PAGE_INVALID,
52 _SEGMENT_ENTRY_INVALID);
53 rste |= move_set_bit(pte_val(pte), _PAGE_PROTECT,
54 _SEGMENT_ENTRY_PROTECT);
55 rste |= move_set_bit(pte_val(pte), _PAGE_DIRTY,
56 _SEGMENT_ENTRY_DIRTY);
57 rste |= move_set_bit(pte_val(pte), _PAGE_YOUNG,
58 _SEGMENT_ENTRY_YOUNG);
59#ifdef CONFIG_MEM_SOFT_DIRTY
60 rste |= move_set_bit(pte_val(pte), _PAGE_SOFT_DIRTY,
61 _SEGMENT_ENTRY_SOFT_DIRTY);
62#endif
63 rste |= move_set_bit(pte_val(pte), _PAGE_NOEXEC,
64 _SEGMENT_ENTRY_NOEXEC);
65 } else
66 rste = _SEGMENT_ENTRY_EMPTY;
67 return rste;
68}
69
70static inline pte_t __rste_to_pte(unsigned long rste)
71{
72 int present;
73 pte_t pte;
74
75 if ((rste & _REGION_ENTRY_TYPE_MASK) == _REGION_ENTRY_TYPE_R3)
76 present = pud_present(__pud(rste));
77 else
78 present = pmd_present(__pmd(rste));
79
80 /*
81 * Convert encoding pmd / pud bits pte bits
82 * dy..R...I...wr lIR.uswrdy.p
83 * empty 00..0...1...00 -> 010.000000.0
84 * prot-none, clean, old 00..1...1...00 -> 111.000000.1
85 * prot-none, clean, young 01..1...1...00 -> 111.000001.1
86 * prot-none, dirty, old 10..1...1...00 -> 111.000010.1
87 * prot-none, dirty, young 11..1...1...00 -> 111.000011.1
88 * read-only, clean, old 00..1...1...01 -> 111.000100.1
89 * read-only, clean, young 01..1...0...01 -> 101.000101.1
90 * read-only, dirty, old 10..1...1...01 -> 111.000110.1
91 * read-only, dirty, young 11..1...0...01 -> 101.000111.1
92 * read-write, clean, old 00..1...1...11 -> 111.001100.1
93 * read-write, clean, young 01..1...0...11 -> 101.001101.1
94 * read-write, dirty, old 10..0...1...11 -> 110.001110.1
95 * read-write, dirty, young 11..0...0...11 -> 100.001111.1
96 * HW-bits: R read-only, I invalid
97 * SW-bits: p present, y young, d dirty, r read, w write, s special,
98 * u unused, l large
99 */
100 if (present) {
101 pte_val(pte) = rste & _SEGMENT_ENTRY_ORIGIN_LARGE;
102 pte_val(pte) |= _PAGE_LARGE | _PAGE_PRESENT;
103 pte_val(pte) |= move_set_bit(rste, _SEGMENT_ENTRY_READ,
104 _PAGE_READ);
105 pte_val(pte) |= move_set_bit(rste, _SEGMENT_ENTRY_WRITE,
106 _PAGE_WRITE);
107 pte_val(pte) |= move_set_bit(rste, _SEGMENT_ENTRY_INVALID,
108 _PAGE_INVALID);
109 pte_val(pte) |= move_set_bit(rste, _SEGMENT_ENTRY_PROTECT,
110 _PAGE_PROTECT);
111 pte_val(pte) |= move_set_bit(rste, _SEGMENT_ENTRY_DIRTY,
112 _PAGE_DIRTY);
113 pte_val(pte) |= move_set_bit(rste, _SEGMENT_ENTRY_YOUNG,
114 _PAGE_YOUNG);
115#ifdef CONFIG_MEM_SOFT_DIRTY
116 pte_val(pte) |= move_set_bit(rste, _SEGMENT_ENTRY_SOFT_DIRTY,
117 _PAGE_DIRTY);
118#endif
119 pte_val(pte) |= move_set_bit(rste, _SEGMENT_ENTRY_NOEXEC,
120 _PAGE_NOEXEC);
121 } else
122 pte_val(pte) = _PAGE_INVALID;
123 return pte;
124}
125
126static void clear_huge_pte_skeys(struct mm_struct *mm, unsigned long rste)
127{
128 struct page *page;
129 unsigned long size, paddr;
130
131 if (!mm_uses_skeys(mm) ||
132 rste & _SEGMENT_ENTRY_INVALID)
133 return;
134
135 if ((rste & _REGION_ENTRY_TYPE_MASK) == _REGION_ENTRY_TYPE_R3) {
136 page = pud_page(__pud(rste));
137 size = PUD_SIZE;
138 paddr = rste & PUD_MASK;
139 } else {
140 page = pmd_page(__pmd(rste));
141 size = PMD_SIZE;
142 paddr = rste & PMD_MASK;
143 }
144
145 if (!test_and_set_bit(PG_arch_1, &page->flags))
146 __storage_key_init_range(paddr, paddr + size - 1);
147}
148
149void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
150 pte_t *ptep, pte_t pte)
151{
152 unsigned long rste;
153
154 rste = __pte_to_rste(pte);
155 if (!MACHINE_HAS_NX)
156 rste &= ~_SEGMENT_ENTRY_NOEXEC;
157
158 /* Set correct table type for 2G hugepages */
159 if ((pte_val(*ptep) & _REGION_ENTRY_TYPE_MASK) == _REGION_ENTRY_TYPE_R3)
160 rste |= _REGION_ENTRY_TYPE_R3 | _REGION3_ENTRY_LARGE;
161 else
162 rste |= _SEGMENT_ENTRY_LARGE;
163 clear_huge_pte_skeys(mm, rste);
164 pte_val(*ptep) = rste;
165}
166
167pte_t huge_ptep_get(pte_t *ptep)
168{
169 return __rste_to_pte(pte_val(*ptep));
170}
171
172pte_t huge_ptep_get_and_clear(struct mm_struct *mm,
173 unsigned long addr, pte_t *ptep)
174{
175 pte_t pte = huge_ptep_get(ptep);
176 pmd_t *pmdp = (pmd_t *) ptep;
177 pud_t *pudp = (pud_t *) ptep;
178
179 if ((pte_val(*ptep) & _REGION_ENTRY_TYPE_MASK) == _REGION_ENTRY_TYPE_R3)
180 pudp_xchg_direct(mm, addr, pudp, __pud(_REGION3_ENTRY_EMPTY));
181 else
182 pmdp_xchg_direct(mm, addr, pmdp, __pmd(_SEGMENT_ENTRY_EMPTY));
183 return pte;
184}
185
186pte_t *huge_pte_alloc(struct mm_struct *mm,
187 unsigned long addr, unsigned long sz)
188{
189 pgd_t *pgdp;
190 p4d_t *p4dp;
191 pud_t *pudp;
192 pmd_t *pmdp = NULL;
193
194 pgdp = pgd_offset(mm, addr);
195 p4dp = p4d_alloc(mm, pgdp, addr);
196 if (p4dp) {
197 pudp = pud_alloc(mm, p4dp, addr);
198 if (pudp) {
199 if (sz == PUD_SIZE)
200 return (pte_t *) pudp;
201 else if (sz == PMD_SIZE)
202 pmdp = pmd_alloc(mm, pudp, addr);
203 }
204 }
205 return (pte_t *) pmdp;
206}
207
208pte_t *huge_pte_offset(struct mm_struct *mm,
209 unsigned long addr, unsigned long sz)
210{
211 pgd_t *pgdp;
212 p4d_t *p4dp;
213 pud_t *pudp;
214 pmd_t *pmdp = NULL;
215
216 pgdp = pgd_offset(mm, addr);
217 if (pgd_present(*pgdp)) {
218 p4dp = p4d_offset(pgdp, addr);
219 if (p4d_present(*p4dp)) {
220 pudp = pud_offset(p4dp, addr);
221 if (pud_present(*pudp)) {
222 if (pud_large(*pudp))
223 return (pte_t *) pudp;
224 pmdp = pmd_offset(pudp, addr);
225 }
226 }
227 }
228 return (pte_t *) pmdp;
229}
230
231int pmd_huge(pmd_t pmd)
232{
233 return pmd_large(pmd);
234}
235
236int pud_huge(pud_t pud)
237{
238 return pud_large(pud);
239}
240
241struct page *
242follow_huge_pud(struct mm_struct *mm, unsigned long address,
243 pud_t *pud, int flags)
244{
245 if (flags & FOLL_GET)
246 return NULL;
247
248 return pud_page(*pud) + ((address & ~PUD_MASK) >> PAGE_SHIFT);
249}
250
251static __init int setup_hugepagesz(char *opt)
252{
253 unsigned long size;
254 char *string = opt;
255
256 size = memparse(opt, &opt);
257 if (MACHINE_HAS_EDAT1 && size == PMD_SIZE) {
258 hugetlb_add_hstate(PMD_SHIFT - PAGE_SHIFT);
259 } else if (MACHINE_HAS_EDAT2 && size == PUD_SIZE) {
260 hugetlb_add_hstate(PUD_SHIFT - PAGE_SHIFT);
261 } else {
262 hugetlb_bad_size();
263 pr_err("hugepagesz= specifies an unsupported page size %s\n",
264 string);
265 return 0;
266 }
267 return 1;
268}
269__setup("hugepagesz=", setup_hugepagesz);