1 // SPDX-License-Identifier: GPL-2.0
2 #include <linux/hugetlb.h>
5 #ifdef CONFIG_RISCV_ISA_SVNAPOT
6 pte_t huge_ptep_get(pte_t *ptep)
10 pte_t orig_pte = ptep_get(ptep);
12 if (!pte_present(orig_pte) || !pte_napot(orig_pte))
15 pte_num = napot_pte_num(napot_cont_order(orig_pte));
17 for (i = 0; i < pte_num; i++, ptep++) {
18 pte_t pte = ptep_get(ptep);
21 orig_pte = pte_mkdirty(orig_pte);
24 orig_pte = pte_mkyoung(orig_pte);
30 pte_t *huge_pte_alloc(struct mm_struct *mm,
31 struct vm_area_struct *vma,
42 pgd = pgd_offset(mm, addr);
43 p4d = p4d_alloc(mm, pgd, addr);
47 pud = pud_alloc(mm, p4d, addr);
57 if (want_pmd_share(vma, addr) && pud_none(*pud))
58 pte = huge_pmd_share(mm, vma, addr, pud);
60 pte = (pte_t *)pmd_alloc(mm, pud, addr);
64 pmd = pmd_alloc(mm, pud, addr);
68 for_each_napot_order(order) {
69 if (napot_cont_size(order) == sz) {
70 pte = pte_alloc_map(mm, pmd, addr & napot_cont_mask(order));
76 WARN_ON_ONCE(pte && pte_present(*pte) && !pte_huge(*pte));
80 pte_t *huge_pte_offset(struct mm_struct *mm,
91 pgd = pgd_offset(mm, addr);
92 if (!pgd_present(*pgd))
95 p4d = p4d_offset(pgd, addr);
96 if (!p4d_present(*p4d))
99 pud = pud_offset(p4d, addr);
101 /* must be pud huge, non-present or none */
104 if (!pud_present(*pud))
107 pmd = pmd_offset(pud, addr);
109 /* must be pmd huge, non-present or none */
112 if (!pmd_present(*pmd))
115 for_each_napot_order(order) {
116 if (napot_cont_size(order) == sz) {
117 pte = pte_offset_kernel(pmd, addr & napot_cont_mask(order));
124 static pte_t get_clear_contig(struct mm_struct *mm,
127 unsigned long pte_num)
129 pte_t orig_pte = ptep_get(ptep);
132 for (i = 0; i < pte_num; i++, addr += PAGE_SIZE, ptep++) {
133 pte_t pte = ptep_get_and_clear(mm, addr, ptep);
136 orig_pte = pte_mkdirty(orig_pte);
139 orig_pte = pte_mkyoung(orig_pte);
145 static pte_t get_clear_contig_flush(struct mm_struct *mm,
148 unsigned long pte_num)
150 pte_t orig_pte = get_clear_contig(mm, addr, ptep, pte_num);
151 struct vm_area_struct vma = TLB_FLUSH_VMA(mm, 0);
152 bool valid = !pte_none(orig_pte);
155 flush_tlb_range(&vma, addr, addr + (PAGE_SIZE * pte_num));
160 pte_t arch_make_huge_pte(pte_t entry, unsigned int shift, vm_flags_t flags)
164 for_each_napot_order(order) {
165 if (shift == napot_cont_shift(order)) {
166 entry = pte_mknapot(entry, order);
170 if (order == NAPOT_ORDER_MAX)
171 entry = pte_mkhuge(entry);
176 void set_huge_pte_at(struct mm_struct *mm,
183 if (!pte_napot(pte)) {
184 set_pte_at(mm, addr, ptep, pte);
188 pte_num = napot_pte_num(napot_cont_order(pte));
189 for (i = 0; i < pte_num; i++, ptep++, addr += PAGE_SIZE)
190 set_pte_at(mm, addr, ptep, pte);
193 int huge_ptep_set_access_flags(struct vm_area_struct *vma,
199 struct mm_struct *mm = vma->vm_mm;
205 return ptep_set_access_flags(vma, addr, ptep, pte, dirty);
207 order = napot_cont_order(pte);
208 pte_num = napot_pte_num(order);
209 ptep = huge_pte_offset(mm, addr, napot_cont_size(order));
210 orig_pte = get_clear_contig_flush(mm, addr, ptep, pte_num);
212 if (pte_dirty(orig_pte))
213 pte = pte_mkdirty(pte);
215 if (pte_young(orig_pte))
216 pte = pte_mkyoung(pte);
218 for (i = 0; i < pte_num; i++, addr += PAGE_SIZE, ptep++)
219 set_pte_at(mm, addr, ptep, pte);
224 pte_t huge_ptep_get_and_clear(struct mm_struct *mm,
228 pte_t orig_pte = ptep_get(ptep);
231 if (!pte_napot(orig_pte))
232 return ptep_get_and_clear(mm, addr, ptep);
234 pte_num = napot_pte_num(napot_cont_order(orig_pte));
236 return get_clear_contig(mm, addr, ptep, pte_num);
239 void huge_ptep_set_wrprotect(struct mm_struct *mm,
243 pte_t pte = ptep_get(ptep);
248 if (!pte_napot(pte)) {
249 ptep_set_wrprotect(mm, addr, ptep);
253 order = napot_cont_order(pte);
254 pte_num = napot_pte_num(order);
255 ptep = huge_pte_offset(mm, addr, napot_cont_size(order));
256 orig_pte = get_clear_contig_flush(mm, addr, ptep, pte_num);
258 orig_pte = pte_wrprotect(orig_pte);
260 for (i = 0; i < pte_num; i++, addr += PAGE_SIZE, ptep++)
261 set_pte_at(mm, addr, ptep, orig_pte);
264 pte_t huge_ptep_clear_flush(struct vm_area_struct *vma,
268 pte_t pte = ptep_get(ptep);
272 return ptep_clear_flush(vma, addr, ptep);
274 pte_num = napot_pte_num(napot_cont_order(pte));
276 return get_clear_contig_flush(vma->vm_mm, addr, ptep, pte_num);
279 void huge_pte_clear(struct mm_struct *mm,
284 pte_t pte = READ_ONCE(*ptep);
287 if (!pte_napot(pte)) {
288 pte_clear(mm, addr, ptep);
292 pte_num = napot_pte_num(napot_cont_order(pte));
293 for (i = 0; i < pte_num; i++, addr += PAGE_SIZE, ptep++)
294 pte_clear(mm, addr, ptep);
297 static __init bool is_napot_size(unsigned long size)
304 for_each_napot_order(order) {
305 if (size == napot_cont_size(order))
311 static __init int napot_hugetlbpages_init(void)
316 for_each_napot_order(order)
317 hugetlb_add_hstate(order);
321 arch_initcall(napot_hugetlbpages_init);
325 static __init bool is_napot_size(unsigned long size)
330 #endif /*CONFIG_RISCV_ISA_SVNAPOT*/
332 int pud_huge(pud_t pud)
334 return pud_leaf(pud);
337 int pmd_huge(pmd_t pmd)
339 return pmd_leaf(pmd);
342 bool __init arch_hugetlb_valid_size(unsigned long size)
344 if (size == HPAGE_SIZE)
346 else if (IS_ENABLED(CONFIG_64BIT) && size == PUD_SIZE)
348 else if (is_napot_size(size))
354 #ifdef CONFIG_CONTIG_ALLOC
355 static __init int gigantic_pages_init(void)
357 /* With CONTIG_ALLOC, we can allocate gigantic pages at runtime */
358 if (IS_ENABLED(CONFIG_64BIT))
359 hugetlb_add_hstate(PUD_SHIFT - PAGE_SHIFT);
362 arch_initcall(gigantic_pages_init);