1 #ifndef _ASM_POWERPC_BOOK3S_64_PGALLOC_H
2 #define _ASM_POWERPC_BOOK3S_64_PGALLOC_H
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version
7 * 2 of the License, or (at your option) any later version.
10 #include <linux/slab.h>
11 #include <linux/cpumask.h>
12 #include <linux/kmemleak.h>
13 #include <linux/percpu.h>
15 struct vmemmap_backing {
16 struct vmemmap_backing *list;
18 unsigned long virt_addr;
20 extern struct vmemmap_backing *vmemmap_list;
23 * Functions that deal with pagetables that could be at any level of
24 * the table need to be passed an "index_size" so they know how to
25 * handle allocation. For PTE pages (which are linked to a struct
26 * page for now, and drawn from the main get_free_pages() pool), the
27 * allocation size will be (2^index_size * sizeof(pointer)) and
28 * allocations are drawn from the kmem_cache in PGT_CACHE(index_size).
30 * The maximum index size needs to be big enough to allow any
31 * pagetable sizes we need, but small enough to fit in the low bits of
32 * any page table pointer. In other words all pagetables, even tiny
33 * ones, must be aligned to allow at least enough low 0 bits to
34 * contain this value. This value is also used as a mask, so it must
35 * be one less than a power of two.
37 #define MAX_PGTABLE_INDEX_SIZE 0xf
39 extern struct kmem_cache *pgtable_cache[];
40 #define PGT_CACHE(shift) pgtable_cache[shift]
42 extern pte_t *pte_fragment_alloc(struct mm_struct *, int);
43 extern pmd_t *pmd_fragment_alloc(struct mm_struct *, unsigned long);
44 extern void pte_fragment_free(unsigned long *, int);
45 extern void pmd_fragment_free(unsigned long *);
46 extern void pgtable_free_tlb(struct mmu_gather *tlb, void *table, int shift);
48 extern void __tlb_remove_table(void *_table);
50 void pte_frag_destroy(void *pte_frag);
52 static inline pgd_t *radix__pgd_alloc(struct mm_struct *mm)
54 #ifdef CONFIG_PPC_64K_PAGES
55 return (pgd_t *)__get_free_page(pgtable_gfp_flags(mm, PGALLOC_GFP));
58 page = alloc_pages(pgtable_gfp_flags(mm, PGALLOC_GFP | __GFP_RETRY_MAYFAIL),
62 return (pgd_t *) page_address(page);
66 static inline void radix__pgd_free(struct mm_struct *mm, pgd_t *pgd)
68 #ifdef CONFIG_PPC_64K_PAGES
69 free_page((unsigned long)pgd);
71 free_pages((unsigned long)pgd, 4);
75 static inline pgd_t *pgd_alloc(struct mm_struct *mm)
80 return radix__pgd_alloc(mm);
82 pgd = kmem_cache_alloc(PGT_CACHE(PGD_INDEX_SIZE),
83 pgtable_gfp_flags(mm, GFP_KERNEL));
85 * Don't scan the PGD for pointers, it contains references to PUDs but
86 * those references are not full pointers and so can't be recognised by
89 kmemleak_no_scan(pgd);
92 * With hugetlb, we don't clear the second half of the page table.
93 * If we share the same slab cache with the pmd or pud level table,
94 * we need to make sure we zero out the full table on alloc.
95 * With 4K we don't store slot in the second half. Hence we don't
96 * need to do this for 4k.
98 #if defined(CONFIG_HUGETLB_PAGE) && defined(CONFIG_PPC_64K_PAGES) && \
99 (H_PGD_INDEX_SIZE == H_PUD_CACHE_INDEX)
100 memset(pgd, 0, PGD_TABLE_SIZE);
105 static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
108 return radix__pgd_free(mm, pgd);
109 kmem_cache_free(PGT_CACHE(PGD_INDEX_SIZE), pgd);
112 static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, pud_t *pud)
114 pgd_set(pgd, __pgtable_ptr_val(pud) | PGD_VAL_BITS);
117 static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr)
121 pud = kmem_cache_alloc(PGT_CACHE(PUD_CACHE_INDEX),
122 pgtable_gfp_flags(mm, GFP_KERNEL));
124 * Tell kmemleak to ignore the PUD, that means don't scan it for
125 * pointers and don't consider it a leak. PUDs are typically only
126 * referred to by their PGD, but kmemleak is not able to recognise those
127 * as pointers, leading to false leak reports.
129 kmemleak_ignore(pud);
134 static inline void pud_free(struct mm_struct *mm, pud_t *pud)
136 kmem_cache_free(PGT_CACHE(PUD_CACHE_INDEX), pud);
139 static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
141 pud_set(pud, __pgtable_ptr_val(pmd) | PUD_VAL_BITS);
144 static inline void __pud_free_tlb(struct mmu_gather *tlb, pud_t *pud,
145 unsigned long address)
148 * By now all the pud entries should be none entries. So go
149 * ahead and flush the page walk cache
151 flush_tlb_pgtable(tlb, address);
152 pgtable_free_tlb(tlb, pud, PUD_INDEX);
155 static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long addr)
157 return pmd_fragment_alloc(mm, addr);
160 static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
162 pmd_fragment_free((unsigned long *)pmd);
165 static inline void __pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmd,
166 unsigned long address)
169 * By now all the pud entries should be none entries. So go
170 * ahead and flush the page walk cache
172 flush_tlb_pgtable(tlb, address);
173 return pgtable_free_tlb(tlb, pmd, PMD_INDEX);
176 static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd,
179 pmd_set(pmd, __pgtable_ptr_val(pte) | PMD_VAL_BITS);
182 static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd,
185 pmd_set(pmd, __pgtable_ptr_val(pte_page) | PMD_VAL_BITS);
188 static inline pgtable_t pmd_pgtable(pmd_t pmd)
190 return (pgtable_t)pmd_page_vaddr(pmd);
193 static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm)
195 return (pte_t *)pte_fragment_alloc(mm, 1);
198 static inline pgtable_t pte_alloc_one(struct mm_struct *mm)
200 return (pgtable_t)pte_fragment_alloc(mm, 0);
203 static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
205 pte_fragment_free((unsigned long *)pte, 1);
208 static inline void pte_free(struct mm_struct *mm, pgtable_t ptepage)
210 pte_fragment_free((unsigned long *)ptepage, 0);
213 static inline void __pte_free_tlb(struct mmu_gather *tlb, pgtable_t table,
214 unsigned long address)
217 * By now all the pud entries should be none entries. So go
218 * ahead and flush the page walk cache
220 flush_tlb_pgtable(tlb, address);
221 pgtable_free_tlb(tlb, table, PTE_INDEX);
224 #define check_pgt_cache() do { } while (0)
226 extern atomic_long_t direct_pages_count[MMU_PAGE_COUNT];
227 static inline void update_page_count(int psize, long count)
229 if (IS_ENABLED(CONFIG_PROC_FS))
230 atomic_long_add(count, &direct_pages_count[psize]);
233 #endif /* _ASM_POWERPC_BOOK3S_64_PGALLOC_H */