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_huge(mm, pmd, addr & napot_cont_mask(order));
77 pte_t pteval = ptep_get_lockless(pte);
79 WARN_ON_ONCE(pte_present(pteval) && !pte_huge(pteval));
84 pte_t *huge_pte_offset(struct mm_struct *mm,
95 pgd = pgd_offset(mm, addr);
96 if (!pgd_present(*pgd))
99 p4d = p4d_offset(pgd, addr);
100 if (!p4d_present(*p4d))
103 pud = pud_offset(p4d, addr);
105 /* must be pud huge, non-present or none */
108 if (!pud_present(*pud))
111 pmd = pmd_offset(pud, addr);
113 /* must be pmd huge, non-present or none */
116 if (!pmd_present(*pmd))
119 for_each_napot_order(order) {
120 if (napot_cont_size(order) == sz) {
121 pte = pte_offset_huge(pmd, addr & napot_cont_mask(order));
128 static pte_t get_clear_contig(struct mm_struct *mm,
131 unsigned long pte_num)
133 pte_t orig_pte = ptep_get(ptep);
136 for (i = 0; i < pte_num; i++, addr += PAGE_SIZE, ptep++) {
137 pte_t pte = ptep_get_and_clear(mm, addr, ptep);
140 orig_pte = pte_mkdirty(orig_pte);
143 orig_pte = pte_mkyoung(orig_pte);
149 static pte_t get_clear_contig_flush(struct mm_struct *mm,
152 unsigned long pte_num)
154 pte_t orig_pte = get_clear_contig(mm, addr, ptep, pte_num);
155 struct vm_area_struct vma = TLB_FLUSH_VMA(mm, 0);
156 bool valid = !pte_none(orig_pte);
159 flush_tlb_range(&vma, addr, addr + (PAGE_SIZE * pte_num));
164 pte_t arch_make_huge_pte(pte_t entry, unsigned int shift, vm_flags_t flags)
168 for_each_napot_order(order) {
169 if (shift == napot_cont_shift(order)) {
170 entry = pte_mknapot(entry, order);
174 if (order == NAPOT_ORDER_MAX)
175 entry = pte_mkhuge(entry);
180 void set_huge_pte_at(struct mm_struct *mm,
188 if (!pte_napot(pte)) {
189 set_pte_at(mm, addr, ptep, pte);
193 pte_num = napot_pte_num(napot_cont_order(pte));
194 for (i = 0; i < pte_num; i++, ptep++, addr += PAGE_SIZE)
195 set_pte_at(mm, addr, ptep, pte);
198 int huge_ptep_set_access_flags(struct vm_area_struct *vma,
204 struct mm_struct *mm = vma->vm_mm;
210 return ptep_set_access_flags(vma, addr, ptep, pte, dirty);
212 order = napot_cont_order(pte);
213 pte_num = napot_pte_num(order);
214 ptep = huge_pte_offset(mm, addr, napot_cont_size(order));
215 orig_pte = get_clear_contig_flush(mm, addr, ptep, pte_num);
217 if (pte_dirty(orig_pte))
218 pte = pte_mkdirty(pte);
220 if (pte_young(orig_pte))
221 pte = pte_mkyoung(pte);
223 for (i = 0; i < pte_num; i++, addr += PAGE_SIZE, ptep++)
224 set_pte_at(mm, addr, ptep, pte);
229 pte_t huge_ptep_get_and_clear(struct mm_struct *mm,
233 pte_t orig_pte = ptep_get(ptep);
236 if (!pte_napot(orig_pte))
237 return ptep_get_and_clear(mm, addr, ptep);
239 pte_num = napot_pte_num(napot_cont_order(orig_pte));
241 return get_clear_contig(mm, addr, ptep, pte_num);
244 void huge_ptep_set_wrprotect(struct mm_struct *mm,
248 pte_t pte = ptep_get(ptep);
253 if (!pte_napot(pte)) {
254 ptep_set_wrprotect(mm, addr, ptep);
258 order = napot_cont_order(pte);
259 pte_num = napot_pte_num(order);
260 ptep = huge_pte_offset(mm, addr, napot_cont_size(order));
261 orig_pte = get_clear_contig_flush(mm, addr, ptep, pte_num);
263 orig_pte = pte_wrprotect(orig_pte);
265 for (i = 0; i < pte_num; i++, addr += PAGE_SIZE, ptep++)
266 set_pte_at(mm, addr, ptep, orig_pte);
269 pte_t huge_ptep_clear_flush(struct vm_area_struct *vma,
273 pte_t pte = ptep_get(ptep);
277 return ptep_clear_flush(vma, addr, ptep);
279 pte_num = napot_pte_num(napot_cont_order(pte));
281 return get_clear_contig_flush(vma->vm_mm, addr, ptep, pte_num);
284 void huge_pte_clear(struct mm_struct *mm,
289 pte_t pte = READ_ONCE(*ptep);
292 if (!pte_napot(pte)) {
293 pte_clear(mm, addr, ptep);
297 pte_num = napot_pte_num(napot_cont_order(pte));
298 for (i = 0; i < pte_num; i++, addr += PAGE_SIZE, ptep++)
299 pte_clear(mm, addr, ptep);
302 static __init bool is_napot_size(unsigned long size)
309 for_each_napot_order(order) {
310 if (size == napot_cont_size(order))
316 static __init int napot_hugetlbpages_init(void)
321 for_each_napot_order(order)
322 hugetlb_add_hstate(order);
326 arch_initcall(napot_hugetlbpages_init);
330 static __init bool is_napot_size(unsigned long size)
335 #endif /*CONFIG_RISCV_ISA_SVNAPOT*/
337 int pud_huge(pud_t pud)
339 return pud_leaf(pud);
342 int pmd_huge(pmd_t pmd)
344 return pmd_leaf(pmd);
347 bool __init arch_hugetlb_valid_size(unsigned long size)
349 if (size == HPAGE_SIZE)
351 else if (IS_ENABLED(CONFIG_64BIT) && size == PUD_SIZE)
353 else if (is_napot_size(size))
359 #ifdef CONFIG_CONTIG_ALLOC
360 static __init int gigantic_pages_init(void)
362 /* With CONTIG_ALLOC, we can allocate gigantic pages at runtime */
363 if (IS_ENABLED(CONFIG_64BIT))
364 hugetlb_add_hstate(PUD_SHIFT - PAGE_SHIFT);
367 arch_initcall(gigantic_pages_init);