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/percpu.h>
14 struct vmemmap_backing {
15 struct vmemmap_backing *list;
17 unsigned long virt_addr;
19 extern struct vmemmap_backing *vmemmap_list;
22 * Functions that deal with pagetables that could be at any level of
23 * the table need to be passed an "index_size" so they know how to
24 * handle allocation. For PTE pages (which are linked to a struct
25 * page for now, and drawn from the main get_free_pages() pool), the
26 * allocation size will be (2^index_size * sizeof(pointer)) and
27 * allocations are drawn from the kmem_cache in PGT_CACHE(index_size).
29 * The maximum index size needs to be big enough to allow any
30 * pagetable sizes we need, but small enough to fit in the low bits of
31 * any page table pointer. In other words all pagetables, even tiny
32 * ones, must be aligned to allow at least enough low 0 bits to
33 * contain this value. This value is also used as a mask, so it must
34 * be one less than a power of two.
36 #define MAX_PGTABLE_INDEX_SIZE 0xf
38 extern struct kmem_cache *pgtable_cache[];
39 #define PGT_CACHE(shift) ({ \
41 pgtable_cache[(shift) - 1]; \
44 static inline pgd_t *pgd_alloc(struct mm_struct *mm)
46 return kmem_cache_alloc(PGT_CACHE(PGD_INDEX_SIZE), GFP_KERNEL);
49 static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
51 kmem_cache_free(PGT_CACHE(PGD_INDEX_SIZE), pgd);
54 #ifndef CONFIG_PPC_64K_PAGES
55 static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, pud_t *pud)
57 pgd_set(pgd, __pgtable_ptr_val(pud));
60 static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr)
62 return kmem_cache_alloc(PGT_CACHE(PUD_INDEX_SIZE),
63 GFP_KERNEL|__GFP_REPEAT);
66 static inline void pud_free(struct mm_struct *mm, pud_t *pud)
68 kmem_cache_free(PGT_CACHE(PUD_INDEX_SIZE), pud);
71 static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
73 pud_set(pud, __pgtable_ptr_val(pmd));
76 static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd,
79 pmd_set(pmd, __pgtable_ptr_val(pte));
82 static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd,
85 pmd_set(pmd, __pgtable_ptr_val(page_address(pte_page)));
88 static inline pgtable_t pmd_pgtable(pmd_t pmd)
93 static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
94 unsigned long address)
96 return (pte_t *)__get_free_page(GFP_KERNEL | __GFP_REPEAT | __GFP_ZERO);
99 static inline pgtable_t pte_alloc_one(struct mm_struct *mm,
100 unsigned long address)
105 pte = pte_alloc_one_kernel(mm, address);
108 page = virt_to_page(pte);
109 if (!pgtable_page_ctor(page)) {
116 static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
118 free_page((unsigned long)pte);
121 static inline void pte_free(struct mm_struct *mm, pgtable_t ptepage)
123 pgtable_page_dtor(ptepage);
124 __free_page(ptepage);
127 static inline void pgtable_free(void *table, unsigned index_size)
130 free_page((unsigned long)table);
132 BUG_ON(index_size > MAX_PGTABLE_INDEX_SIZE);
133 kmem_cache_free(PGT_CACHE(index_size), table);
138 static inline void pgtable_free_tlb(struct mmu_gather *tlb,
139 void *table, int shift)
141 unsigned long pgf = (unsigned long)table;
142 BUG_ON(shift > MAX_PGTABLE_INDEX_SIZE);
144 tlb_remove_table(tlb, (void *)pgf);
147 static inline void __tlb_remove_table(void *_table)
149 void *table = (void *)((unsigned long)_table & ~MAX_PGTABLE_INDEX_SIZE);
150 unsigned shift = (unsigned long)_table & MAX_PGTABLE_INDEX_SIZE;
152 pgtable_free(table, shift);
154 #else /* !CONFIG_SMP */
155 static inline void pgtable_free_tlb(struct mmu_gather *tlb,
156 void *table, int shift)
158 pgtable_free(table, shift);
160 #endif /* CONFIG_SMP */
162 static inline void __pte_free_tlb(struct mmu_gather *tlb, pgtable_t table,
163 unsigned long address)
165 tlb_flush_pgtable(tlb, address);
166 pgtable_page_dtor(table);
167 pgtable_free_tlb(tlb, page_address(table), 0);
170 #else /* if CONFIG_PPC_64K_PAGES */
172 extern pte_t *page_table_alloc(struct mm_struct *, unsigned long, int);
173 extern void page_table_free(struct mm_struct *, unsigned long *, int);
174 extern void pgtable_free_tlb(struct mmu_gather *tlb, void *table, int shift);
176 extern void __tlb_remove_table(void *_table);
179 #ifndef __PAGETABLE_PUD_FOLDED
180 /* book3s 64 is 4 level page table */
181 static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, pud_t *pud)
183 pgd_set(pgd, __pgtable_ptr_val(pud));
186 static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr)
188 return kmem_cache_alloc(PGT_CACHE(PUD_INDEX_SIZE),
189 GFP_KERNEL|__GFP_REPEAT);
192 static inline void pud_free(struct mm_struct *mm, pud_t *pud)
194 kmem_cache_free(PGT_CACHE(PUD_INDEX_SIZE), pud);
198 static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
200 pud_set(pud, __pgtable_ptr_val(pmd));
203 static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd,
206 pmd_set(pmd, __pgtable_ptr_val(pte));
209 static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd,
212 pmd_set(pmd, __pgtable_ptr_val(pte_page));
215 static inline pgtable_t pmd_pgtable(pmd_t pmd)
217 return (pgtable_t)pmd_page_vaddr(pmd);
220 static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
221 unsigned long address)
223 return (pte_t *)page_table_alloc(mm, address, 1);
226 static inline pgtable_t pte_alloc_one(struct mm_struct *mm,
227 unsigned long address)
229 return (pgtable_t)page_table_alloc(mm, address, 0);
232 static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
234 page_table_free(mm, (unsigned long *)pte, 1);
237 static inline void pte_free(struct mm_struct *mm, pgtable_t ptepage)
239 page_table_free(mm, (unsigned long *)ptepage, 0);
242 static inline void __pte_free_tlb(struct mmu_gather *tlb, pgtable_t table,
243 unsigned long address)
245 tlb_flush_pgtable(tlb, address);
246 pgtable_free_tlb(tlb, table, 0);
248 #endif /* CONFIG_PPC_64K_PAGES */
250 static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long addr)
252 return kmem_cache_alloc(PGT_CACHE(PMD_CACHE_INDEX),
253 GFP_KERNEL|__GFP_REPEAT);
256 static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
258 kmem_cache_free(PGT_CACHE(PMD_CACHE_INDEX), pmd);
261 #define __pmd_free_tlb(tlb, pmd, addr) \
262 pgtable_free_tlb(tlb, pmd, PMD_CACHE_INDEX)
263 #ifndef __PAGETABLE_PUD_FOLDED
264 #define __pud_free_tlb(tlb, pud, addr) \
265 pgtable_free_tlb(tlb, pud, PUD_INDEX_SIZE)
267 #endif /* __PAGETABLE_PUD_FOLDED */
269 #define check_pgt_cache() do { } while (0)
271 #endif /* _ASM_POWERPC_BOOK3S_64_PGALLOC_H */