| /* 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 <asm/page.h> | |
| #include <asm/pgtable.h> | |
| #define is_hugepage_only_range(mm, addr, len) 0 | |
| #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) | |
| { | |
| if (len & ~HPAGE_MASK) | |
| return -EINVAL; | |
| if (addr & ~HPAGE_MASK) | |
| return -EINVAL; | |
| return 0; | |
| } | |
| #define arch_clear_hugepage_flags(page) do { } while (0) | |
| 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) | |
| pte_val(*ptep) = _REGION3_ENTRY_EMPTY; | |
| else | |
| pte_val(*ptep) = _SEGMENT_ENTRY_EMPTY; | |
| } | |
| static inline void huge_ptep_clear_flush(struct vm_area_struct *vma, | |
| unsigned long address, pte_t *ptep) | |
| { | |
| 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_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); | |
| } | |
| #ifdef CONFIG_ARCH_HAS_GIGANTIC_PAGE | |
| static inline bool gigantic_page_supported(void) { return true; } | |
| #endif | |
| #endif /* _ASM_S390_HUGETLB_H */ |