| // SPDX-License-Identifier: GPL-2.0 |
| #include <linux/hugetlb.h> |
| #include <linux/err.h> |
| |
| #ifdef CONFIG_RISCV_ISA_SVNAPOT |
| pte_t huge_ptep_get(pte_t *ptep) |
| { |
| unsigned long pte_num; |
| int i; |
| pte_t orig_pte = ptep_get(ptep); |
| |
| if (!pte_present(orig_pte) || !pte_napot(orig_pte)) |
| return orig_pte; |
| |
| pte_num = napot_pte_num(napot_cont_order(orig_pte)); |
| |
| for (i = 0; i < pte_num; i++, ptep++) { |
| pte_t pte = ptep_get(ptep); |
| |
| if (pte_dirty(pte)) |
| orig_pte = pte_mkdirty(orig_pte); |
| |
| if (pte_young(pte)) |
| orig_pte = pte_mkyoung(orig_pte); |
| } |
| |
| return orig_pte; |
| } |
| |
| pte_t *huge_pte_alloc(struct mm_struct *mm, |
| struct vm_area_struct *vma, |
| unsigned long addr, |
| unsigned long sz) |
| { |
| unsigned long order; |
| pte_t *pte = NULL; |
| pgd_t *pgd; |
| p4d_t *p4d; |
| pud_t *pud; |
| pmd_t *pmd; |
| |
| pgd = pgd_offset(mm, addr); |
| p4d = p4d_alloc(mm, pgd, addr); |
| if (!p4d) |
| return NULL; |
| |
| pud = pud_alloc(mm, p4d, addr); |
| if (!pud) |
| return NULL; |
| |
| if (sz == PUD_SIZE) { |
| pte = (pte_t *)pud; |
| goto out; |
| } |
| |
| if (sz == PMD_SIZE) { |
| if (want_pmd_share(vma, addr) && pud_none(*pud)) |
| pte = huge_pmd_share(mm, vma, addr, pud); |
| else |
| pte = (pte_t *)pmd_alloc(mm, pud, addr); |
| goto out; |
| } |
| |
| pmd = pmd_alloc(mm, pud, addr); |
| if (!pmd) |
| return NULL; |
| |
| for_each_napot_order(order) { |
| if (napot_cont_size(order) == sz) { |
| pte = pte_alloc_huge(mm, pmd, addr & napot_cont_mask(order)); |
| break; |
| } |
| } |
| |
| out: |
| if (pte) { |
| pte_t pteval = ptep_get_lockless(pte); |
| |
| WARN_ON_ONCE(pte_present(pteval) && !pte_huge(pteval)); |
| } |
| return pte; |
| } |
| |
| pte_t *huge_pte_offset(struct mm_struct *mm, |
| unsigned long addr, |
| unsigned long sz) |
| { |
| unsigned long order; |
| pte_t *pte = NULL; |
| pgd_t *pgd; |
| p4d_t *p4d; |
| pud_t *pud; |
| pmd_t *pmd; |
| |
| pgd = pgd_offset(mm, addr); |
| if (!pgd_present(*pgd)) |
| return NULL; |
| |
| p4d = p4d_offset(pgd, addr); |
| if (!p4d_present(*p4d)) |
| return NULL; |
| |
| pud = pud_offset(p4d, addr); |
| if (sz == PUD_SIZE) |
| /* must be pud huge, non-present or none */ |
| return (pte_t *)pud; |
| |
| if (!pud_present(*pud)) |
| return NULL; |
| |
| pmd = pmd_offset(pud, addr); |
| if (sz == PMD_SIZE) |
| /* must be pmd huge, non-present or none */ |
| return (pte_t *)pmd; |
| |
| if (!pmd_present(*pmd)) |
| return NULL; |
| |
| for_each_napot_order(order) { |
| if (napot_cont_size(order) == sz) { |
| pte = pte_offset_huge(pmd, addr & napot_cont_mask(order)); |
| break; |
| } |
| } |
| return pte; |
| } |
| |
| static pte_t get_clear_contig(struct mm_struct *mm, |
| unsigned long addr, |
| pte_t *ptep, |
| unsigned long pte_num) |
| { |
| pte_t orig_pte = ptep_get(ptep); |
| unsigned long i; |
| |
| for (i = 0; i < pte_num; i++, addr += PAGE_SIZE, ptep++) { |
| pte_t pte = ptep_get_and_clear(mm, addr, ptep); |
| |
| if (pte_dirty(pte)) |
| orig_pte = pte_mkdirty(orig_pte); |
| |
| if (pte_young(pte)) |
| orig_pte = pte_mkyoung(orig_pte); |
| } |
| |
| return orig_pte; |
| } |
| |
| static pte_t get_clear_contig_flush(struct mm_struct *mm, |
| unsigned long addr, |
| pte_t *ptep, |
| unsigned long pte_num) |
| { |
| pte_t orig_pte = get_clear_contig(mm, addr, ptep, pte_num); |
| struct vm_area_struct vma = TLB_FLUSH_VMA(mm, 0); |
| bool valid = !pte_none(orig_pte); |
| |
| if (valid) |
| flush_tlb_range(&vma, addr, addr + (PAGE_SIZE * pte_num)); |
| |
| return orig_pte; |
| } |
| |
| pte_t arch_make_huge_pte(pte_t entry, unsigned int shift, vm_flags_t flags) |
| { |
| unsigned long order; |
| |
| for_each_napot_order(order) { |
| if (shift == napot_cont_shift(order)) { |
| entry = pte_mknapot(entry, order); |
| break; |
| } |
| } |
| if (order == NAPOT_ORDER_MAX) |
| entry = pte_mkhuge(entry); |
| |
| return entry; |
| } |
| |
| void set_huge_pte_at(struct mm_struct *mm, |
| unsigned long addr, |
| pte_t *ptep, |
| pte_t pte) |
| { |
| int i, pte_num; |
| |
| if (!pte_napot(pte)) { |
| set_pte_at(mm, addr, ptep, pte); |
| return; |
| } |
| |
| pte_num = napot_pte_num(napot_cont_order(pte)); |
| for (i = 0; i < pte_num; i++, ptep++, addr += PAGE_SIZE) |
| set_pte_at(mm, addr, ptep, pte); |
| } |
| |
| int huge_ptep_set_access_flags(struct vm_area_struct *vma, |
| unsigned long addr, |
| pte_t *ptep, |
| pte_t pte, |
| int dirty) |
| { |
| struct mm_struct *mm = vma->vm_mm; |
| unsigned long order; |
| pte_t orig_pte; |
| int i, pte_num; |
| |
| if (!pte_napot(pte)) |
| return ptep_set_access_flags(vma, addr, ptep, pte, dirty); |
| |
| order = napot_cont_order(pte); |
| pte_num = napot_pte_num(order); |
| ptep = huge_pte_offset(mm, addr, napot_cont_size(order)); |
| orig_pte = get_clear_contig_flush(mm, addr, ptep, pte_num); |
| |
| if (pte_dirty(orig_pte)) |
| pte = pte_mkdirty(pte); |
| |
| if (pte_young(orig_pte)) |
| pte = pte_mkyoung(pte); |
| |
| for (i = 0; i < pte_num; i++, addr += PAGE_SIZE, ptep++) |
| set_pte_at(mm, addr, ptep, pte); |
| |
| return true; |
| } |
| |
| pte_t huge_ptep_get_and_clear(struct mm_struct *mm, |
| unsigned long addr, |
| pte_t *ptep) |
| { |
| pte_t orig_pte = ptep_get(ptep); |
| int pte_num; |
| |
| if (!pte_napot(orig_pte)) |
| return ptep_get_and_clear(mm, addr, ptep); |
| |
| pte_num = napot_pte_num(napot_cont_order(orig_pte)); |
| |
| return get_clear_contig(mm, addr, ptep, pte_num); |
| } |
| |
| void huge_ptep_set_wrprotect(struct mm_struct *mm, |
| unsigned long addr, |
| pte_t *ptep) |
| { |
| pte_t pte = ptep_get(ptep); |
| unsigned long order; |
| pte_t orig_pte; |
| int i, pte_num; |
| |
| if (!pte_napot(pte)) { |
| ptep_set_wrprotect(mm, addr, ptep); |
| return; |
| } |
| |
| order = napot_cont_order(pte); |
| pte_num = napot_pte_num(order); |
| ptep = huge_pte_offset(mm, addr, napot_cont_size(order)); |
| orig_pte = get_clear_contig_flush(mm, addr, ptep, pte_num); |
| |
| orig_pte = pte_wrprotect(orig_pte); |
| |
| for (i = 0; i < pte_num; i++, addr += PAGE_SIZE, ptep++) |
| set_pte_at(mm, addr, ptep, orig_pte); |
| } |
| |
| pte_t huge_ptep_clear_flush(struct vm_area_struct *vma, |
| unsigned long addr, |
| pte_t *ptep) |
| { |
| pte_t pte = ptep_get(ptep); |
| int pte_num; |
| |
| if (!pte_napot(pte)) |
| return ptep_clear_flush(vma, addr, ptep); |
| |
| pte_num = napot_pte_num(napot_cont_order(pte)); |
| |
| return get_clear_contig_flush(vma->vm_mm, addr, ptep, pte_num); |
| } |
| |
| void huge_pte_clear(struct mm_struct *mm, |
| unsigned long addr, |
| pte_t *ptep, |
| unsigned long sz) |
| { |
| pte_t pte = READ_ONCE(*ptep); |
| int i, pte_num; |
| |
| if (!pte_napot(pte)) { |
| pte_clear(mm, addr, ptep); |
| return; |
| } |
| |
| pte_num = napot_pte_num(napot_cont_order(pte)); |
| for (i = 0; i < pte_num; i++, addr += PAGE_SIZE, ptep++) |
| pte_clear(mm, addr, ptep); |
| } |
| |
| static __init bool is_napot_size(unsigned long size) |
| { |
| unsigned long order; |
| |
| if (!has_svnapot()) |
| return false; |
| |
| for_each_napot_order(order) { |
| if (size == napot_cont_size(order)) |
| return true; |
| } |
| return false; |
| } |
| |
| static __init int napot_hugetlbpages_init(void) |
| { |
| if (has_svnapot()) { |
| unsigned long order; |
| |
| for_each_napot_order(order) |
| hugetlb_add_hstate(order); |
| } |
| return 0; |
| } |
| arch_initcall(napot_hugetlbpages_init); |
| |
| #else |
| |
| static __init bool is_napot_size(unsigned long size) |
| { |
| return false; |
| } |
| |
| #endif /*CONFIG_RISCV_ISA_SVNAPOT*/ |
| |
| int pud_huge(pud_t pud) |
| { |
| return pud_leaf(pud); |
| } |
| |
| int pmd_huge(pmd_t pmd) |
| { |
| return pmd_leaf(pmd); |
| } |
| |
| bool __init arch_hugetlb_valid_size(unsigned long size) |
| { |
| if (size == HPAGE_SIZE) |
| return true; |
| else if (IS_ENABLED(CONFIG_64BIT) && size == PUD_SIZE) |
| return true; |
| else if (is_napot_size(size)) |
| return true; |
| else |
| return false; |
| } |
| |
| #ifdef CONFIG_CONTIG_ALLOC |
| static __init int gigantic_pages_init(void) |
| { |
| /* With CONTIG_ALLOC, we can allocate gigantic pages at runtime */ |
| if (IS_ENABLED(CONFIG_64BIT)) |
| hugetlb_add_hstate(PUD_SHIFT - PAGE_SHIFT); |
| return 0; |
| } |
| arch_initcall(gigantic_pages_init); |
| #endif |