| /* SPDX-License-Identifier: GPL-2.0 */ |
| /* |
| * IBM System z Huge TLB Page Support for Kernel. |
| * |
| * Copyright IBM Corp. 2008 |
| * Author(s): Gerald Schaefer <gerald.schaefer@de.ibm.com> |
| */ |
| |
| #ifndef _ASM_S390_HUGETLB_H |
| #define _ASM_S390_HUGETLB_H |
| |
| #include <linux/pgtable.h> |
| #include <asm/page.h> |
| |
| #define hugetlb_free_pgd_range free_pgd_range |
| #define hugepages_supported() (MACHINE_HAS_EDAT1) |
| |
| void set_huge_pte_at(struct mm_struct *mm, unsigned long addr, |
| pte_t *ptep, pte_t pte); |
| pte_t huge_ptep_get(pte_t *ptep); |
| pte_t huge_ptep_get_and_clear(struct mm_struct *mm, |
| unsigned long addr, pte_t *ptep); |
| |
| /* |
| * If the arch doesn't supply something else, assume that hugepage |
| * size aligned regions are ok without further preparation. |
| */ |
| static inline int prepare_hugepage_range(struct file *file, |
| unsigned long addr, unsigned long len) |
| { |
| struct hstate *h = hstate_file(file); |
| |
| if (len & ~huge_page_mask(h)) |
| return -EINVAL; |
| if (addr & ~huge_page_mask(h)) |
| return -EINVAL; |
| return 0; |
| } |
| |
| static inline void arch_clear_hugepage_flags(struct page *page) |
| { |
| clear_bit(PG_arch_1, &page->flags); |
| } |
| #define arch_clear_hugepage_flags arch_clear_hugepage_flags |
| |
| static inline void huge_pte_clear(struct mm_struct *mm, unsigned long addr, |
| pte_t *ptep, unsigned long sz) |
| { |
| if ((pte_val(*ptep) & _REGION_ENTRY_TYPE_MASK) == _REGION_ENTRY_TYPE_R3) |
| set_pte(ptep, __pte(_REGION3_ENTRY_EMPTY)); |
| else |
| set_pte(ptep, __pte(_SEGMENT_ENTRY_EMPTY)); |
| } |
| |
| static inline pte_t huge_ptep_clear_flush(struct vm_area_struct *vma, |
| unsigned long address, pte_t *ptep) |
| { |
| return huge_ptep_get_and_clear(vma->vm_mm, address, ptep); |
| } |
| |
| static inline int huge_ptep_set_access_flags(struct vm_area_struct *vma, |
| unsigned long addr, pte_t *ptep, |
| pte_t pte, int dirty) |
| { |
| int changed = !pte_same(huge_ptep_get(ptep), pte); |
| if (changed) { |
| huge_ptep_get_and_clear(vma->vm_mm, addr, ptep); |
| set_huge_pte_at(vma->vm_mm, addr, ptep, pte); |
| } |
| return changed; |
| } |
| |
| static inline void huge_ptep_set_wrprotect(struct mm_struct *mm, |
| unsigned long addr, pte_t *ptep) |
| { |
| pte_t pte = huge_ptep_get_and_clear(mm, addr, ptep); |
| set_huge_pte_at(mm, addr, ptep, pte_wrprotect(pte)); |
| } |
| |
| static inline pte_t mk_huge_pte(struct page *page, pgprot_t pgprot) |
| { |
| return mk_pte(page, pgprot); |
| } |
| |
| static inline int huge_pte_none(pte_t pte) |
| { |
| return pte_none(pte); |
| } |
| |
| static inline int huge_pte_none_mostly(pte_t pte) |
| { |
| return huge_pte_none(pte); |
| } |
| |
| static inline int huge_pte_write(pte_t pte) |
| { |
| return pte_write(pte); |
| } |
| |
| static inline int huge_pte_dirty(pte_t pte) |
| { |
| return pte_dirty(pte); |
| } |
| |
| static inline pte_t huge_pte_mkwrite(pte_t pte) |
| { |
| return pte_mkwrite(pte); |
| } |
| |
| static inline pte_t huge_pte_mkdirty(pte_t pte) |
| { |
| return pte_mkdirty(pte); |
| } |
| |
| static inline pte_t huge_pte_wrprotect(pte_t pte) |
| { |
| return pte_wrprotect(pte); |
| } |
| |
| static inline pte_t huge_pte_modify(pte_t pte, pgprot_t newprot) |
| { |
| return pte_modify(pte, newprot); |
| } |
| |
| static inline pte_t huge_pte_mkuffd_wp(pte_t pte) |
| { |
| return pte; |
| } |
| |
| static inline pte_t huge_pte_clear_uffd_wp(pte_t pte) |
| { |
| return pte; |
| } |
| |
| static inline int huge_pte_uffd_wp(pte_t pte) |
| { |
| return 0; |
| } |
| |
| static inline bool gigantic_page_runtime_supported(void) |
| { |
| return true; |
| } |
| |
| #endif /* _ASM_S390_HUGETLB_H */ |
