1 /* SPDX-License-Identifier: GPL-2.0-or-later */
2 #ifndef _ASM_POWERPC_BOOK3S_64_PGALLOC_H
3 #define _ASM_POWERPC_BOOK3S_64_PGALLOC_H
7 #include <linux/slab.h>
8 #include <linux/cpumask.h>
9 #include <linux/kmemleak.h>
10 #include <linux/percpu.h>
12 struct vmemmap_backing {
13 struct vmemmap_backing *list;
15 unsigned long virt_addr;
17 extern struct vmemmap_backing *vmemmap_list;
19 extern pmd_t *pmd_fragment_alloc(struct mm_struct *, unsigned long);
20 extern void pmd_fragment_free(unsigned long *);
21 extern void pgtable_free_tlb(struct mmu_gather *tlb, void *table, int shift);
22 extern void __tlb_remove_table(void *_table);
23 void pte_frag_destroy(void *pte_frag);
25 static inline pgd_t *radix__pgd_alloc(struct mm_struct *mm)
27 #ifdef CONFIG_PPC_64K_PAGES
28 return (pgd_t *)__get_free_page(pgtable_gfp_flags(mm, PGALLOC_GFP));
31 page = alloc_pages(pgtable_gfp_flags(mm, PGALLOC_GFP | __GFP_RETRY_MAYFAIL),
35 return (pgd_t *) page_address(page);
39 static inline void radix__pgd_free(struct mm_struct *mm, pgd_t *pgd)
41 #ifdef CONFIG_PPC_64K_PAGES
42 free_page((unsigned long)pgd);
44 free_pages((unsigned long)pgd, 4);
48 static inline pgd_t *pgd_alloc(struct mm_struct *mm)
53 return radix__pgd_alloc(mm);
55 pgd = kmem_cache_alloc(PGT_CACHE(PGD_INDEX_SIZE),
56 pgtable_gfp_flags(mm, GFP_KERNEL));
61 * Don't scan the PGD for pointers, it contains references to PUDs but
62 * those references are not full pointers and so can't be recognised by
65 kmemleak_no_scan(pgd);
68 * With hugetlb, we don't clear the second half of the page table.
69 * If we share the same slab cache with the pmd or pud level table,
70 * we need to make sure we zero out the full table on alloc.
71 * With 4K we don't store slot in the second half. Hence we don't
72 * need to do this for 4k.
74 #if defined(CONFIG_HUGETLB_PAGE) && defined(CONFIG_PPC_64K_PAGES) && \
75 (H_PGD_INDEX_SIZE == H_PUD_CACHE_INDEX)
76 memset(pgd, 0, PGD_TABLE_SIZE);
81 static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
84 return radix__pgd_free(mm, pgd);
85 kmem_cache_free(PGT_CACHE(PGD_INDEX_SIZE), pgd);
88 static inline void p4d_populate(struct mm_struct *mm, p4d_t *pgd, pud_t *pud)
90 *pgd = __p4d(__pgtable_ptr_val(pud) | PGD_VAL_BITS);
93 static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr)
97 pud = kmem_cache_alloc(PGT_CACHE(PUD_CACHE_INDEX),
98 pgtable_gfp_flags(mm, GFP_KERNEL));
100 * Tell kmemleak to ignore the PUD, that means don't scan it for
101 * pointers and don't consider it a leak. PUDs are typically only
102 * referred to by their PGD, but kmemleak is not able to recognise those
103 * as pointers, leading to false leak reports.
105 kmemleak_ignore(pud);
110 static inline void __pud_free(pud_t *pud)
112 struct page *page = virt_to_page(pud);
115 * Early pud pages allocated via memblock allocator
116 * can't be directly freed to slab. KFENCE pages have
117 * both reserved and slab flags set so need to be freed
120 if (PageReserved(page) && !PageSlab(page))
121 free_reserved_page(page);
123 kmem_cache_free(PGT_CACHE(PUD_CACHE_INDEX), pud);
126 static inline void pud_free(struct mm_struct *mm, pud_t *pud)
128 return __pud_free(pud);
131 static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
133 *pud = __pud(__pgtable_ptr_val(pmd) | PUD_VAL_BITS);
136 static inline void __pud_free_tlb(struct mmu_gather *tlb, pud_t *pud,
137 unsigned long address)
139 pgtable_free_tlb(tlb, pud, PUD_INDEX);
142 static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long addr)
144 return pmd_fragment_alloc(mm, addr);
147 static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
149 pmd_fragment_free((unsigned long *)pmd);
152 static inline void __pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmd,
153 unsigned long address)
155 return pgtable_free_tlb(tlb, pmd, PMD_INDEX);
158 static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd,
161 *pmd = __pmd(__pgtable_ptr_val(pte) | PMD_VAL_BITS);
164 static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd,
167 *pmd = __pmd(__pgtable_ptr_val(pte_page) | PMD_VAL_BITS);
170 static inline void __pte_free_tlb(struct mmu_gather *tlb, pgtable_t table,
171 unsigned long address)
173 pgtable_free_tlb(tlb, table, PTE_INDEX);
176 extern atomic_long_t direct_pages_count[MMU_PAGE_COUNT];
177 static inline void update_page_count(int psize, long count)
179 if (IS_ENABLED(CONFIG_PROC_FS))
180 atomic_long_add(count, &direct_pages_count[psize]);
183 #endif /* _ASM_POWERPC_BOOK3S_64_PGALLOC_H */