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);
23 extern void __tlb_remove_table(void *_table);
25 void pte_frag_destroy(void *pte_frag);
27 static inline pgd_t *radix__pgd_alloc(struct mm_struct *mm)
29 #ifdef CONFIG_PPC_64K_PAGES
30 return (pgd_t *)__get_free_page(pgtable_gfp_flags(mm, PGALLOC_GFP));
33 page = alloc_pages(pgtable_gfp_flags(mm, PGALLOC_GFP | __GFP_RETRY_MAYFAIL),
37 return (pgd_t *) page_address(page);
41 static inline void radix__pgd_free(struct mm_struct *mm, pgd_t *pgd)
43 #ifdef CONFIG_PPC_64K_PAGES
44 free_page((unsigned long)pgd);
46 free_pages((unsigned long)pgd, 4);
50 static inline pgd_t *pgd_alloc(struct mm_struct *mm)
55 return radix__pgd_alloc(mm);
57 pgd = kmem_cache_alloc(PGT_CACHE(PGD_INDEX_SIZE),
58 pgtable_gfp_flags(mm, GFP_KERNEL));
63 * Don't scan the PGD for pointers, it contains references to PUDs but
64 * those references are not full pointers and so can't be recognised by
67 kmemleak_no_scan(pgd);
70 * With hugetlb, we don't clear the second half of the page table.
71 * If we share the same slab cache with the pmd or pud level table,
72 * we need to make sure we zero out the full table on alloc.
73 * With 4K we don't store slot in the second half. Hence we don't
74 * need to do this for 4k.
76 #if defined(CONFIG_HUGETLB_PAGE) && defined(CONFIG_PPC_64K_PAGES) && \
77 (H_PGD_INDEX_SIZE == H_PUD_CACHE_INDEX)
78 memset(pgd, 0, PGD_TABLE_SIZE);
83 static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
86 return radix__pgd_free(mm, pgd);
87 kmem_cache_free(PGT_CACHE(PGD_INDEX_SIZE), pgd);
90 static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, pud_t *pud)
92 *pgd = __pgd(__pgtable_ptr_val(pud) | PGD_VAL_BITS);
95 static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr)
99 pud = kmem_cache_alloc(PGT_CACHE(PUD_CACHE_INDEX),
100 pgtable_gfp_flags(mm, GFP_KERNEL));
102 * Tell kmemleak to ignore the PUD, that means don't scan it for
103 * pointers and don't consider it a leak. PUDs are typically only
104 * referred to by their PGD, but kmemleak is not able to recognise those
105 * as pointers, leading to false leak reports.
107 kmemleak_ignore(pud);
112 static inline void pud_free(struct mm_struct *mm, pud_t *pud)
114 kmem_cache_free(PGT_CACHE(PUD_CACHE_INDEX), pud);
117 static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
119 *pud = __pud(__pgtable_ptr_val(pmd) | PUD_VAL_BITS);
122 static inline void __pud_free_tlb(struct mmu_gather *tlb, pud_t *pud,
123 unsigned long address)
126 * By now all the pud entries should be none entries. So go
127 * ahead and flush the page walk cache
129 flush_tlb_pgtable(tlb, address);
130 pgtable_free_tlb(tlb, pud, PUD_INDEX);
133 static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long addr)
135 return pmd_fragment_alloc(mm, addr);
138 static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
140 pmd_fragment_free((unsigned long *)pmd);
143 static inline void __pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmd,
144 unsigned long address)
147 * By now all the pud entries should be none entries. So go
148 * ahead and flush the page walk cache
150 flush_tlb_pgtable(tlb, address);
151 return pgtable_free_tlb(tlb, pmd, PMD_INDEX);
154 static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd,
157 *pmd = __pmd(__pgtable_ptr_val(pte) | PMD_VAL_BITS);
160 static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd,
163 *pmd = __pmd(__pgtable_ptr_val(pte_page) | PMD_VAL_BITS);
166 static inline void __pte_free_tlb(struct mmu_gather *tlb, pgtable_t table,
167 unsigned long address)
170 * By now all the pud entries should be none entries. So go
171 * ahead and flush the page walk cache
173 flush_tlb_pgtable(tlb, address);
174 pgtable_free_tlb(tlb, table, PTE_INDEX);
177 extern atomic_long_t direct_pages_count[MMU_PAGE_COUNT];
178 static inline void update_page_count(int psize, long count)
180 if (IS_ENABLED(CONFIG_PROC_FS))
181 atomic_long_add(count, &direct_pages_count[psize]);
184 #endif /* _ASM_POWERPC_BOOK3S_64_PGALLOC_H */