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1/*
2 * arch/arm64/mm/hugetlbpage.c
3 *
4 * Copyright (C) 2013 Linaro Ltd.
5 *
6 * Based on arch/x86/mm/hugetlbpage.c.
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 */
17
18#include <linux/init.h>
19#include <linux/fs.h>
20#include <linux/mm.h>
21#include <linux/hugetlb.h>
22#include <linux/pagemap.h>
23#include <linux/err.h>
24#include <linux/sysctl.h>
25#include <asm/mman.h>
26#include <asm/tlb.h>
27#include <asm/tlbflush.h>
28#include <asm/pgalloc.h>
29
30int pmd_huge(pmd_t pmd)
31{
32 return pmd_val(pmd) && !(pmd_val(pmd) & PMD_TABLE_BIT);
33}
34
35int pud_huge(pud_t pud)
36{
37#ifndef __PAGETABLE_PMD_FOLDED
38 return pud_val(pud) && !(pud_val(pud) & PUD_TABLE_BIT);
39#else
40 return 0;
41#endif
42}
43
44static int find_num_contig(struct mm_struct *mm, unsigned long addr,
45 pte_t *ptep, pte_t pte, size_t *pgsize)
46{
47 pgd_t *pgd = pgd_offset(mm, addr);
48 pud_t *pud;
49 pmd_t *pmd;
50
51 *pgsize = PAGE_SIZE;
52 if (!pte_cont(pte))
53 return 1;
54 if (!pgd_present(*pgd)) {
55 VM_BUG_ON(!pgd_present(*pgd));
56 return 1;
57 }
58 pud = pud_offset(pgd, addr);
59 if (!pud_present(*pud)) {
60 VM_BUG_ON(!pud_present(*pud));
61 return 1;
62 }
63 pmd = pmd_offset(pud, addr);
64 if (!pmd_present(*pmd)) {
65 VM_BUG_ON(!pmd_present(*pmd));
66 return 1;
67 }
68 if ((pte_t *)pmd == ptep) {
69 *pgsize = PMD_SIZE;
70 return CONT_PMDS;
71 }
72 return CONT_PTES;
73}
74
75void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
76 pte_t *ptep, pte_t pte)
77{
78 size_t pgsize;
79 int i;
80 int ncontig = find_num_contig(mm, addr, ptep, pte, &pgsize);
81 unsigned long pfn;
82 pgprot_t hugeprot;
83
84 if (ncontig == 1) {
85 set_pte_at(mm, addr, ptep, pte);
86 return;
87 }
88
89 pfn = pte_pfn(pte);
90 hugeprot = __pgprot(pte_val(pfn_pte(pfn, __pgprot(0))) ^ pte_val(pte));
91 for (i = 0; i < ncontig; i++) {
92 pr_debug("%s: set pte %p to 0x%llx\n", __func__, ptep,
93 pte_val(pfn_pte(pfn, hugeprot)));
94 set_pte_at(mm, addr, ptep, pfn_pte(pfn, hugeprot));
95 ptep++;
96 pfn += pgsize >> PAGE_SHIFT;
97 addr += pgsize;
98 }
99}
100
101pte_t *huge_pte_alloc(struct mm_struct *mm,
102 unsigned long addr, unsigned long sz)
103{
104 pgd_t *pgd;
105 pud_t *pud;
106 pte_t *pte = NULL;
107
108 pr_debug("%s: addr:0x%lx sz:0x%lx\n", __func__, addr, sz);
109 pgd = pgd_offset(mm, addr);
110 pud = pud_alloc(mm, pgd, addr);
111 if (!pud)
112 return NULL;
113
114 if (sz == PUD_SIZE) {
115 pte = (pte_t *)pud;
116 } else if (sz == (PAGE_SIZE * CONT_PTES)) {
117 pmd_t *pmd = pmd_alloc(mm, pud, addr);
118
119 WARN_ON(addr & (sz - 1));
120 /*
121 * Note that if this code were ever ported to the
122 * 32-bit arm platform then it will cause trouble in
123 * the case where CONFIG_HIGHPTE is set, since there
124 * will be no pte_unmap() to correspond with this
125 * pte_alloc_map().
126 */
127 pte = pte_alloc_map(mm, pmd, addr);
128 } else if (sz == PMD_SIZE) {
129 if (IS_ENABLED(CONFIG_ARCH_WANT_HUGE_PMD_SHARE) &&
130 pud_none(*pud))
131 pte = huge_pmd_share(mm, addr, pud);
132 else
133 pte = (pte_t *)pmd_alloc(mm, pud, addr);
134 } else if (sz == (PMD_SIZE * CONT_PMDS)) {
135 pmd_t *pmd;
136
137 pmd = pmd_alloc(mm, pud, addr);
138 WARN_ON(addr & (sz - 1));
139 return (pte_t *)pmd;
140 }
141
142 pr_debug("%s: addr:0x%lx sz:0x%lx ret pte=%p/0x%llx\n", __func__, addr,
143 sz, pte, pte_val(*pte));
144 return pte;
145}
146
147pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr)
148{
149 pgd_t *pgd;
150 pud_t *pud;
151 pmd_t *pmd = NULL;
152 pte_t *pte = NULL;
153
154 pgd = pgd_offset(mm, addr);
155 pr_debug("%s: addr:0x%lx pgd:%p\n", __func__, addr, pgd);
156 if (!pgd_present(*pgd))
157 return NULL;
158 pud = pud_offset(pgd, addr);
159 if (!pud_present(*pud))
160 return NULL;
161
162 if (pud_huge(*pud))
163 return (pte_t *)pud;
164 pmd = pmd_offset(pud, addr);
165 if (!pmd_present(*pmd))
166 return NULL;
167
168 if (pte_cont(pmd_pte(*pmd))) {
169 pmd = pmd_offset(
170 pud, (addr & CONT_PMD_MASK));
171 return (pte_t *)pmd;
172 }
173 if (pmd_huge(*pmd))
174 return (pte_t *)pmd;
175 pte = pte_offset_kernel(pmd, addr);
176 if (pte_present(*pte) && pte_cont(*pte)) {
177 pte = pte_offset_kernel(
178 pmd, (addr & CONT_PTE_MASK));
179 return pte;
180 }
181 return NULL;
182}
183
184pte_t arch_make_huge_pte(pte_t entry, struct vm_area_struct *vma,
185 struct page *page, int writable)
186{
187 size_t pagesize = huge_page_size(hstate_vma(vma));
188
189 if (pagesize == CONT_PTE_SIZE) {
190 entry = pte_mkcont(entry);
191 } else if (pagesize == CONT_PMD_SIZE) {
192 entry = pmd_pte(pmd_mkcont(pte_pmd(entry)));
193 } else if (pagesize != PUD_SIZE && pagesize != PMD_SIZE) {
194 pr_warn("%s: unrecognized huge page size 0x%lx\n",
195 __func__, pagesize);
196 }
197 return entry;
198}
199
200pte_t huge_ptep_get_and_clear(struct mm_struct *mm,
201 unsigned long addr, pte_t *ptep)
202{
203 pte_t pte;
204
205 if (pte_cont(*ptep)) {
206 int ncontig, i;
207 size_t pgsize;
208 pte_t *cpte;
209 bool is_dirty = false;
210
211 cpte = huge_pte_offset(mm, addr);
212 ncontig = find_num_contig(mm, addr, cpte, *cpte, &pgsize);
213 /* save the 1st pte to return */
214 pte = ptep_get_and_clear(mm, addr, cpte);
215 for (i = 1; i < ncontig; ++i) {
216 /*
217 * If HW_AFDBM is enabled, then the HW could
218 * turn on the dirty bit for any of the page
219 * in the set, so check them all.
220 */
221 ++cpte;
222 if (pte_dirty(ptep_get_and_clear(mm, addr, cpte)))
223 is_dirty = true;
224 }
225 if (is_dirty)
226 return pte_mkdirty(pte);
227 else
228 return pte;
229 } else {
230 return ptep_get_and_clear(mm, addr, ptep);
231 }
232}
233
234int huge_ptep_set_access_flags(struct vm_area_struct *vma,
235 unsigned long addr, pte_t *ptep,
236 pte_t pte, int dirty)
237{
238 pte_t *cpte;
239
240 if (pte_cont(pte)) {
241 int ncontig, i, changed = 0;
242 size_t pgsize = 0;
243 unsigned long pfn = pte_pfn(pte);
244 /* Select all bits except the pfn */
245 pgprot_t hugeprot =
246 __pgprot(pte_val(pfn_pte(pfn, __pgprot(0))) ^
247 pte_val(pte));
248
249 cpte = huge_pte_offset(vma->vm_mm, addr);
250 pfn = pte_pfn(*cpte);
251 ncontig = find_num_contig(vma->vm_mm, addr, cpte,
252 *cpte, &pgsize);
253 for (i = 0; i < ncontig; ++i, ++cpte) {
254 changed = ptep_set_access_flags(vma, addr, cpte,
255 pfn_pte(pfn,
256 hugeprot),
257 dirty);
258 pfn += pgsize >> PAGE_SHIFT;
259 }
260 return changed;
261 } else {
262 return ptep_set_access_flags(vma, addr, ptep, pte, dirty);
263 }
264}
265
266void huge_ptep_set_wrprotect(struct mm_struct *mm,
267 unsigned long addr, pte_t *ptep)
268{
269 if (pte_cont(*ptep)) {
270 int ncontig, i;
271 pte_t *cpte;
272 size_t pgsize = 0;
273
274 cpte = huge_pte_offset(mm, addr);
275 ncontig = find_num_contig(mm, addr, cpte, *cpte, &pgsize);
276 for (i = 0; i < ncontig; ++i, ++cpte)
277 ptep_set_wrprotect(mm, addr, cpte);
278 } else {
279 ptep_set_wrprotect(mm, addr, ptep);
280 }
281}
282
283void huge_ptep_clear_flush(struct vm_area_struct *vma,
284 unsigned long addr, pte_t *ptep)
285{
286 if (pte_cont(*ptep)) {
287 int ncontig, i;
288 pte_t *cpte;
289 size_t pgsize = 0;
290
291 cpte = huge_pte_offset(vma->vm_mm, addr);
292 ncontig = find_num_contig(vma->vm_mm, addr, cpte,
293 *cpte, &pgsize);
294 for (i = 0; i < ncontig; ++i, ++cpte)
295 ptep_clear_flush(vma, addr, cpte);
296 } else {
297 ptep_clear_flush(vma, addr, ptep);
298 }
299}
300
301static __init int setup_hugepagesz(char *opt)
302{
303 unsigned long ps = memparse(opt, &opt);
304
305 if (ps == PMD_SIZE) {
306 hugetlb_add_hstate(PMD_SHIFT - PAGE_SHIFT);
307 } else if (ps == PUD_SIZE) {
308 hugetlb_add_hstate(PUD_SHIFT - PAGE_SHIFT);
309 } else {
310 pr_err("hugepagesz: Unsupported page size %lu K\n", ps >> 10);
311 return 0;
312 }
313 return 1;
314}
315__setup("hugepagesz=", setup_hugepagesz);
1/*
2 * arch/arm64/mm/hugetlbpage.c
3 *
4 * Copyright (C) 2013 Linaro Ltd.
5 *
6 * Based on arch/x86/mm/hugetlbpage.c.
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 */
17
18#include <linux/init.h>
19#include <linux/fs.h>
20#include <linux/mm.h>
21#include <linux/hugetlb.h>
22#include <linux/pagemap.h>
23#include <linux/err.h>
24#include <linux/sysctl.h>
25#include <asm/mman.h>
26#include <asm/tlb.h>
27#include <asm/tlbflush.h>
28#include <asm/pgalloc.h>
29
30int pmd_huge(pmd_t pmd)
31{
32 return pmd_val(pmd) && !(pmd_val(pmd) & PMD_TABLE_BIT);
33}
34
35int pud_huge(pud_t pud)
36{
37#ifndef __PAGETABLE_PMD_FOLDED
38 return pud_val(pud) && !(pud_val(pud) & PUD_TABLE_BIT);
39#else
40 return 0;
41#endif
42}
43
44/*
45 * Select all bits except the pfn
46 */
47static inline pgprot_t pte_pgprot(pte_t pte)
48{
49 unsigned long pfn = pte_pfn(pte);
50
51 return __pgprot(pte_val(pfn_pte(pfn, __pgprot(0))) ^ pte_val(pte));
52}
53
54static int find_num_contig(struct mm_struct *mm, unsigned long addr,
55 pte_t *ptep, size_t *pgsize)
56{
57 pgd_t *pgdp = pgd_offset(mm, addr);
58 pud_t *pudp;
59 pmd_t *pmdp;
60
61 *pgsize = PAGE_SIZE;
62 pudp = pud_offset(pgdp, addr);
63 pmdp = pmd_offset(pudp, addr);
64 if ((pte_t *)pmdp == ptep) {
65 *pgsize = PMD_SIZE;
66 return CONT_PMDS;
67 }
68 return CONT_PTES;
69}
70
71static inline int num_contig_ptes(unsigned long size, size_t *pgsize)
72{
73 int contig_ptes = 0;
74
75 *pgsize = size;
76
77 switch (size) {
78#ifdef CONFIG_ARM64_4K_PAGES
79 case PUD_SIZE:
80#endif
81 case PMD_SIZE:
82 contig_ptes = 1;
83 break;
84 case CONT_PMD_SIZE:
85 *pgsize = PMD_SIZE;
86 contig_ptes = CONT_PMDS;
87 break;
88 case CONT_PTE_SIZE:
89 *pgsize = PAGE_SIZE;
90 contig_ptes = CONT_PTES;
91 break;
92 }
93
94 return contig_ptes;
95}
96
97/*
98 * Changing some bits of contiguous entries requires us to follow a
99 * Break-Before-Make approach, breaking the whole contiguous set
100 * before we can change any entries. See ARM DDI 0487A.k_iss10775,
101 * "Misprogramming of the Contiguous bit", page D4-1762.
102 *
103 * This helper performs the break step.
104 */
105static pte_t get_clear_flush(struct mm_struct *mm,
106 unsigned long addr,
107 pte_t *ptep,
108 unsigned long pgsize,
109 unsigned long ncontig)
110{
111 struct vm_area_struct vma = { .vm_mm = mm };
112 pte_t orig_pte = huge_ptep_get(ptep);
113 bool valid = pte_valid(orig_pte);
114 unsigned long i, saddr = addr;
115
116 for (i = 0; i < ncontig; i++, addr += pgsize, ptep++) {
117 pte_t pte = ptep_get_and_clear(mm, addr, ptep);
118
119 /*
120 * If HW_AFDBM is enabled, then the HW could turn on
121 * the dirty bit for any page in the set, so check
122 * them all. All hugetlb entries are already young.
123 */
124 if (pte_dirty(pte))
125 orig_pte = pte_mkdirty(orig_pte);
126 }
127
128 if (valid)
129 flush_tlb_range(&vma, saddr, addr);
130 return orig_pte;
131}
132
133/*
134 * Changing some bits of contiguous entries requires us to follow a
135 * Break-Before-Make approach, breaking the whole contiguous set
136 * before we can change any entries. See ARM DDI 0487A.k_iss10775,
137 * "Misprogramming of the Contiguous bit", page D4-1762.
138 *
139 * This helper performs the break step for use cases where the
140 * original pte is not needed.
141 */
142static void clear_flush(struct mm_struct *mm,
143 unsigned long addr,
144 pte_t *ptep,
145 unsigned long pgsize,
146 unsigned long ncontig)
147{
148 struct vm_area_struct vma = { .vm_mm = mm };
149 unsigned long i, saddr = addr;
150
151 for (i = 0; i < ncontig; i++, addr += pgsize, ptep++)
152 pte_clear(mm, addr, ptep);
153
154 flush_tlb_range(&vma, saddr, addr);
155}
156
157void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
158 pte_t *ptep, pte_t pte)
159{
160 size_t pgsize;
161 int i;
162 int ncontig;
163 unsigned long pfn, dpfn;
164 pgprot_t hugeprot;
165
166 /*
167 * Code needs to be expanded to handle huge swap and migration
168 * entries. Needed for HUGETLB and MEMORY_FAILURE.
169 */
170 WARN_ON(!pte_present(pte));
171
172 if (!pte_cont(pte)) {
173 set_pte_at(mm, addr, ptep, pte);
174 return;
175 }
176
177 ncontig = find_num_contig(mm, addr, ptep, &pgsize);
178 pfn = pte_pfn(pte);
179 dpfn = pgsize >> PAGE_SHIFT;
180 hugeprot = pte_pgprot(pte);
181
182 clear_flush(mm, addr, ptep, pgsize, ncontig);
183
184 for (i = 0; i < ncontig; i++, ptep++, addr += pgsize, pfn += dpfn)
185 set_pte_at(mm, addr, ptep, pfn_pte(pfn, hugeprot));
186}
187
188void set_huge_swap_pte_at(struct mm_struct *mm, unsigned long addr,
189 pte_t *ptep, pte_t pte, unsigned long sz)
190{
191 int i, ncontig;
192 size_t pgsize;
193
194 ncontig = num_contig_ptes(sz, &pgsize);
195
196 for (i = 0; i < ncontig; i++, ptep++)
197 set_pte(ptep, pte);
198}
199
200pte_t *huge_pte_alloc(struct mm_struct *mm,
201 unsigned long addr, unsigned long sz)
202{
203 pgd_t *pgdp;
204 pud_t *pudp;
205 pmd_t *pmdp;
206 pte_t *ptep = NULL;
207
208 pgdp = pgd_offset(mm, addr);
209 pudp = pud_alloc(mm, pgdp, addr);
210 if (!pudp)
211 return NULL;
212
213 if (sz == PUD_SIZE) {
214 ptep = (pte_t *)pudp;
215 } else if (sz == (PAGE_SIZE * CONT_PTES)) {
216 pmdp = pmd_alloc(mm, pudp, addr);
217
218 WARN_ON(addr & (sz - 1));
219 /*
220 * Note that if this code were ever ported to the
221 * 32-bit arm platform then it will cause trouble in
222 * the case where CONFIG_HIGHPTE is set, since there
223 * will be no pte_unmap() to correspond with this
224 * pte_alloc_map().
225 */
226 ptep = pte_alloc_map(mm, pmdp, addr);
227 } else if (sz == PMD_SIZE) {
228 if (IS_ENABLED(CONFIG_ARCH_WANT_HUGE_PMD_SHARE) &&
229 pud_none(READ_ONCE(*pudp)))
230 ptep = huge_pmd_share(mm, addr, pudp);
231 else
232 ptep = (pte_t *)pmd_alloc(mm, pudp, addr);
233 } else if (sz == (PMD_SIZE * CONT_PMDS)) {
234 pmdp = pmd_alloc(mm, pudp, addr);
235 WARN_ON(addr & (sz - 1));
236 return (pte_t *)pmdp;
237 }
238
239 return ptep;
240}
241
242pte_t *huge_pte_offset(struct mm_struct *mm,
243 unsigned long addr, unsigned long sz)
244{
245 pgd_t *pgdp;
246 pud_t *pudp, pud;
247 pmd_t *pmdp, pmd;
248
249 pgdp = pgd_offset(mm, addr);
250 if (!pgd_present(READ_ONCE(*pgdp)))
251 return NULL;
252
253 pudp = pud_offset(pgdp, addr);
254 pud = READ_ONCE(*pudp);
255 if (sz != PUD_SIZE && pud_none(pud))
256 return NULL;
257 /* hugepage or swap? */
258 if (pud_huge(pud) || !pud_present(pud))
259 return (pte_t *)pudp;
260 /* table; check the next level */
261
262 if (sz == CONT_PMD_SIZE)
263 addr &= CONT_PMD_MASK;
264
265 pmdp = pmd_offset(pudp, addr);
266 pmd = READ_ONCE(*pmdp);
267 if (!(sz == PMD_SIZE || sz == CONT_PMD_SIZE) &&
268 pmd_none(pmd))
269 return NULL;
270 if (pmd_huge(pmd) || !pmd_present(pmd))
271 return (pte_t *)pmdp;
272
273 if (sz == CONT_PTE_SIZE)
274 return pte_offset_kernel(pmdp, (addr & CONT_PTE_MASK));
275
276 return NULL;
277}
278
279pte_t arch_make_huge_pte(pte_t entry, struct vm_area_struct *vma,
280 struct page *page, int writable)
281{
282 size_t pagesize = huge_page_size(hstate_vma(vma));
283
284 if (pagesize == CONT_PTE_SIZE) {
285 entry = pte_mkcont(entry);
286 } else if (pagesize == CONT_PMD_SIZE) {
287 entry = pmd_pte(pmd_mkcont(pte_pmd(entry)));
288 } else if (pagesize != PUD_SIZE && pagesize != PMD_SIZE) {
289 pr_warn("%s: unrecognized huge page size 0x%lx\n",
290 __func__, pagesize);
291 }
292 return entry;
293}
294
295void huge_pte_clear(struct mm_struct *mm, unsigned long addr,
296 pte_t *ptep, unsigned long sz)
297{
298 int i, ncontig;
299 size_t pgsize;
300
301 ncontig = num_contig_ptes(sz, &pgsize);
302
303 for (i = 0; i < ncontig; i++, addr += pgsize, ptep++)
304 pte_clear(mm, addr, ptep);
305}
306
307pte_t huge_ptep_get_and_clear(struct mm_struct *mm,
308 unsigned long addr, pte_t *ptep)
309{
310 int ncontig;
311 size_t pgsize;
312 pte_t orig_pte = huge_ptep_get(ptep);
313
314 if (!pte_cont(orig_pte))
315 return ptep_get_and_clear(mm, addr, ptep);
316
317 ncontig = find_num_contig(mm, addr, ptep, &pgsize);
318
319 return get_clear_flush(mm, addr, ptep, pgsize, ncontig);
320}
321
322int huge_ptep_set_access_flags(struct vm_area_struct *vma,
323 unsigned long addr, pte_t *ptep,
324 pte_t pte, int dirty)
325{
326 int ncontig, i, changed = 0;
327 size_t pgsize = 0;
328 unsigned long pfn = pte_pfn(pte), dpfn;
329 pgprot_t hugeprot;
330 pte_t orig_pte;
331
332 if (!pte_cont(pte))
333 return ptep_set_access_flags(vma, addr, ptep, pte, dirty);
334
335 ncontig = find_num_contig(vma->vm_mm, addr, ptep, &pgsize);
336 dpfn = pgsize >> PAGE_SHIFT;
337
338 orig_pte = get_clear_flush(vma->vm_mm, addr, ptep, pgsize, ncontig);
339 if (!pte_same(orig_pte, pte))
340 changed = 1;
341
342 /* Make sure we don't lose the dirty state */
343 if (pte_dirty(orig_pte))
344 pte = pte_mkdirty(pte);
345
346 hugeprot = pte_pgprot(pte);
347 for (i = 0; i < ncontig; i++, ptep++, addr += pgsize, pfn += dpfn)
348 set_pte_at(vma->vm_mm, addr, ptep, pfn_pte(pfn, hugeprot));
349
350 return changed;
351}
352
353void huge_ptep_set_wrprotect(struct mm_struct *mm,
354 unsigned long addr, pte_t *ptep)
355{
356 unsigned long pfn, dpfn;
357 pgprot_t hugeprot;
358 int ncontig, i;
359 size_t pgsize;
360 pte_t pte;
361
362 if (!pte_cont(READ_ONCE(*ptep))) {
363 ptep_set_wrprotect(mm, addr, ptep);
364 return;
365 }
366
367 ncontig = find_num_contig(mm, addr, ptep, &pgsize);
368 dpfn = pgsize >> PAGE_SHIFT;
369
370 pte = get_clear_flush(mm, addr, ptep, pgsize, ncontig);
371 pte = pte_wrprotect(pte);
372
373 hugeprot = pte_pgprot(pte);
374 pfn = pte_pfn(pte);
375
376 for (i = 0; i < ncontig; i++, ptep++, addr += pgsize, pfn += dpfn)
377 set_pte_at(mm, addr, ptep, pfn_pte(pfn, hugeprot));
378}
379
380void huge_ptep_clear_flush(struct vm_area_struct *vma,
381 unsigned long addr, pte_t *ptep)
382{
383 size_t pgsize;
384 int ncontig;
385
386 if (!pte_cont(READ_ONCE(*ptep))) {
387 ptep_clear_flush(vma, addr, ptep);
388 return;
389 }
390
391 ncontig = find_num_contig(vma->vm_mm, addr, ptep, &pgsize);
392 clear_flush(vma->vm_mm, addr, ptep, pgsize, ncontig);
393}
394
395static __init int setup_hugepagesz(char *opt)
396{
397 unsigned long ps = memparse(opt, &opt);
398
399 switch (ps) {
400#ifdef CONFIG_ARM64_4K_PAGES
401 case PUD_SIZE:
402#endif
403 case PMD_SIZE * CONT_PMDS:
404 case PMD_SIZE:
405 case PAGE_SIZE * CONT_PTES:
406 hugetlb_add_hstate(ilog2(ps) - PAGE_SHIFT);
407 return 1;
408 }
409
410 hugetlb_bad_size();
411 pr_err("hugepagesz: Unsupported page size %lu K\n", ps >> 10);
412 return 0;
413}
414__setup("hugepagesz=", setup_hugepagesz);
415
416#ifdef CONFIG_ARM64_64K_PAGES
417static __init int add_default_hugepagesz(void)
418{
419 if (size_to_hstate(CONT_PTES * PAGE_SIZE) == NULL)
420 hugetlb_add_hstate(CONT_PTE_SHIFT);
421 return 0;
422}
423arch_initcall(add_default_hugepagesz);
424#endif