1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _ASM_POWERPC_HUGETLB_H
3 #define _ASM_POWERPC_HUGETLB_H
5 #ifdef CONFIG_HUGETLB_PAGE
7 #include <asm-generic/hugetlb.h>
9 extern struct kmem_cache *hugepte_cache;
11 #ifdef CONFIG_PPC_BOOK3S_64
13 #include <asm/book3s/64/hugetlb.h>
15 * This should work for other subarchs too. But right now we use the
16 * new format only for 64bit book3s
18 static inline pte_t *hugepd_page(hugepd_t hpd)
20 BUG_ON(!hugepd_ok(hpd));
22 * We have only four bits to encode, MMU page size
24 BUILD_BUG_ON((MMU_PAGE_COUNT - 1) > 0xf);
25 return __va(hpd_val(hpd) & HUGEPD_ADDR_MASK);
28 static inline unsigned int hugepd_mmu_psize(hugepd_t hpd)
30 return (hpd_val(hpd) & HUGEPD_SHIFT_MASK) >> 2;
33 static inline unsigned int hugepd_shift(hugepd_t hpd)
35 return mmu_psize_to_shift(hugepd_mmu_psize(hpd));
37 static inline void flush_hugetlb_page(struct vm_area_struct *vma,
41 return radix__flush_hugetlb_page(vma, vmaddr);
46 static inline pte_t *hugepd_page(hugepd_t hpd)
48 BUG_ON(!hugepd_ok(hpd));
50 return (pte_t *)__va(hpd_val(hpd) & ~HUGEPD_SHIFT_MASK);
52 return (pte_t *)((hpd_val(hpd) &
53 ~HUGEPD_SHIFT_MASK) | PD_HUGE);
57 static inline unsigned int hugepd_shift(hugepd_t hpd)
60 return ((hpd_val(hpd) & _PMD_PAGE_MASK) >> 1) + 17;
62 return hpd_val(hpd) & HUGEPD_SHIFT_MASK;
66 #endif /* CONFIG_PPC_BOOK3S_64 */
69 static inline pte_t *hugepte_offset(hugepd_t hpd, unsigned long addr,
73 * On FSL BookE, we have multiple higher-level table entries that
74 * point to the same hugepte. Just use the first one since they're all
75 * identical. So for that case, idx=0.
77 unsigned long idx = 0;
79 pte_t *dir = hugepd_page(hpd);
80 #ifndef CONFIG_PPC_FSL_BOOK3E
81 idx = (addr & ((1UL << pdshift) - 1)) >> hugepd_shift(hpd);
87 pte_t *huge_pte_offset_and_shift(struct mm_struct *mm,
88 unsigned long addr, unsigned *shift);
90 void flush_dcache_icache_hugepage(struct page *page);
92 #if defined(CONFIG_PPC_MM_SLICES)
93 int is_hugepage_only_range(struct mm_struct *mm, unsigned long addr,
96 static inline int is_hugepage_only_range(struct mm_struct *mm,
104 void book3e_hugetlb_preload(struct vm_area_struct *vma, unsigned long ea,
106 #ifdef CONFIG_PPC_8xx
107 static inline void flush_hugetlb_page(struct vm_area_struct *vma,
108 unsigned long vmaddr)
110 flush_tlb_page(vma, vmaddr);
113 void flush_hugetlb_page(struct vm_area_struct *vma, unsigned long vmaddr);
116 void hugetlb_free_pgd_range(struct mmu_gather *tlb, unsigned long addr,
117 unsigned long end, unsigned long floor,
118 unsigned long ceiling);
121 * If the arch doesn't supply something else, assume that hugepage
122 * size aligned regions are ok without further preparation.
124 static inline int prepare_hugepage_range(struct file *file,
125 unsigned long addr, unsigned long len)
127 struct hstate *h = hstate_file(file);
128 if (len & ~huge_page_mask(h))
130 if (addr & ~huge_page_mask(h))
135 static inline void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
136 pte_t *ptep, pte_t pte)
138 set_pte_at(mm, addr, ptep, pte);
141 static inline pte_t huge_ptep_get_and_clear(struct mm_struct *mm,
142 unsigned long addr, pte_t *ptep)
145 return __pte(pte_update(mm, addr, ptep, ~0UL, 0, 1));
147 return __pte(pte_update(ptep, ~0UL, 0));
151 static inline void huge_ptep_clear_flush(struct vm_area_struct *vma,
152 unsigned long addr, pte_t *ptep)
155 pte = huge_ptep_get_and_clear(vma->vm_mm, addr, ptep);
156 flush_hugetlb_page(vma, addr);
159 static inline int huge_pte_none(pte_t pte)
161 return pte_none(pte);
164 static inline pte_t huge_pte_wrprotect(pte_t pte)
166 return pte_wrprotect(pte);
169 static inline int huge_ptep_set_access_flags(struct vm_area_struct *vma,
170 unsigned long addr, pte_t *ptep,
171 pte_t pte, int dirty)
173 #ifdef HUGETLB_NEED_PRELOAD
175 * The "return 1" forces a call of update_mmu_cache, which will write a
176 * TLB entry. Without this, platforms that don't do a write of the TLB
177 * entry in the TLB miss handler asm will fault ad infinitum.
179 ptep_set_access_flags(vma, addr, ptep, pte, dirty);
182 return ptep_set_access_flags(vma, addr, ptep, pte, dirty);
186 static inline pte_t huge_ptep_get(pte_t *ptep)
191 static inline void arch_clear_hugepage_flags(struct page *page)
195 #else /* ! CONFIG_HUGETLB_PAGE */
196 static inline void flush_hugetlb_page(struct vm_area_struct *vma,
197 unsigned long vmaddr)
201 #define hugepd_shift(x) 0
202 static inline pte_t *hugepte_offset(hugepd_t hpd, unsigned long addr,
207 #endif /* CONFIG_HUGETLB_PAGE */
209 #endif /* _ASM_POWERPC_HUGETLB_H */