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 extern pte_t *pte_fragment_alloc(struct mm_struct *, unsigned long, int);
45 extern void pte_fragment_free(unsigned long *, int);
46 extern void pgtable_free_tlb(struct mmu_gather *tlb, void *table, int shift);
48 extern void __tlb_remove_table(void *_table);
51 static inline pgd_t *radix__pgd_alloc(struct mm_struct *mm)
53 #ifdef CONFIG_PPC_64K_PAGES
54 return (pgd_t *)__get_free_page(pgtable_gfp_flags(mm, PGALLOC_GFP));
57 page = alloc_pages(pgtable_gfp_flags(mm, PGALLOC_GFP | __GFP_RETRY_MAYFAIL),
61 return (pgd_t *) page_address(page);
65 static inline void radix__pgd_free(struct mm_struct *mm, pgd_t *pgd)
67 #ifdef CONFIG_PPC_64K_PAGES
68 free_page((unsigned long)pgd);
70 free_pages((unsigned long)pgd, 4);
74 static inline pgd_t *pgd_alloc(struct mm_struct *mm)
77 return radix__pgd_alloc(mm);
78 return kmem_cache_alloc(PGT_CACHE(PGD_INDEX_SIZE),
79 pgtable_gfp_flags(mm, GFP_KERNEL));
82 static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
85 return radix__pgd_free(mm, pgd);
86 kmem_cache_free(PGT_CACHE(PGD_INDEX_SIZE), pgd);
89 static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, pud_t *pud)
91 pgd_set(pgd, __pgtable_ptr_val(pud) | PGD_VAL_BITS);
94 static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr)
96 return kmem_cache_alloc(PGT_CACHE(PUD_CACHE_INDEX),
97 pgtable_gfp_flags(mm, GFP_KERNEL));
100 static inline void pud_free(struct mm_struct *mm, pud_t *pud)
102 kmem_cache_free(PGT_CACHE(PUD_CACHE_INDEX), pud);
105 static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
107 pud_set(pud, __pgtable_ptr_val(pmd) | PUD_VAL_BITS);
110 static inline void __pud_free_tlb(struct mmu_gather *tlb, pud_t *pud,
111 unsigned long address)
114 * By now all the pud entries should be none entries. So go
115 * ahead and flush the page walk cache
117 flush_tlb_pgtable(tlb, address);
118 pgtable_free_tlb(tlb, pud, PUD_CACHE_INDEX);
121 static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long addr)
123 return kmem_cache_alloc(PGT_CACHE(PMD_CACHE_INDEX),
124 pgtable_gfp_flags(mm, GFP_KERNEL));
127 static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
129 kmem_cache_free(PGT_CACHE(PMD_CACHE_INDEX), pmd);
132 static inline void __pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmd,
133 unsigned long address)
136 * By now all the pud entries should be none entries. So go
137 * ahead and flush the page walk cache
139 flush_tlb_pgtable(tlb, address);
140 return pgtable_free_tlb(tlb, pmd, PMD_CACHE_INDEX);
143 static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd,
146 pmd_set(pmd, __pgtable_ptr_val(pte) | PMD_VAL_BITS);
149 static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd,
152 pmd_set(pmd, __pgtable_ptr_val(pte_page) | PMD_VAL_BITS);
155 static inline pgtable_t pmd_pgtable(pmd_t pmd)
157 return (pgtable_t)pmd_page_vaddr(pmd);
160 #ifdef CONFIG_PPC_4K_PAGES
161 static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
162 unsigned long address)
164 return (pte_t *)__get_free_page(GFP_KERNEL | __GFP_ZERO);
167 static inline pgtable_t pte_alloc_one(struct mm_struct *mm,
168 unsigned long address)
173 pte = (pte_t *)__get_free_page(GFP_KERNEL | __GFP_ZERO | __GFP_ACCOUNT);
176 page = virt_to_page(pte);
177 if (!pgtable_page_ctor(page)) {
183 #else /* if CONFIG_PPC_64K_PAGES */
185 static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
186 unsigned long address)
188 return (pte_t *)pte_fragment_alloc(mm, address, 1);
191 static inline pgtable_t pte_alloc_one(struct mm_struct *mm,
192 unsigned long address)
194 return (pgtable_t)pte_fragment_alloc(mm, address, 0);
198 static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
200 pte_fragment_free((unsigned long *)pte, 1);
203 static inline void pte_free(struct mm_struct *mm, pgtable_t ptepage)
205 pte_fragment_free((unsigned long *)ptepage, 0);
208 static inline void __pte_free_tlb(struct mmu_gather *tlb, pgtable_t table,
209 unsigned long address)
212 * By now all the pud entries should be none entries. So go
213 * ahead and flush the page walk cache
215 flush_tlb_pgtable(tlb, address);
216 pgtable_free_tlb(tlb, table, 0);
219 #define check_pgt_cache() do { } while (0)
221 #endif /* _ASM_POWERPC_BOOK3S_64_PGALLOC_H */