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