1 #ifndef _ASM_POWERPC_PGALLOC_64_H 2 #define _ASM_POWERPC_PGALLOC_64_H 3 /* 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. 8 */ 9 10 #include <linux/slab.h> 11 #include <linux/cpumask.h> 12 #include <linux/percpu.h> 13 14 struct vmemmap_backing { 15 struct vmemmap_backing *list; 16 unsigned long phys; 17 unsigned long virt_addr; 18 }; 19 extern struct vmemmap_backing *vmemmap_list; 20 21 /* 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). 28 * 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. 35 */ 36 #define MAX_PGTABLE_INDEX_SIZE 0xf 37 38 extern struct kmem_cache *pgtable_cache[]; 39 #define PGT_CACHE(shift) ({ \ 40 BUG_ON(!(shift)); \ 41 pgtable_cache[(shift) - 1]; \ 42 }) 43 44 static inline pgd_t *pgd_alloc(struct mm_struct *mm) 45 { 46 return kmem_cache_alloc(PGT_CACHE(PGD_INDEX_SIZE), GFP_KERNEL); 47 } 48 49 static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd) 50 { 51 kmem_cache_free(PGT_CACHE(PGD_INDEX_SIZE), pgd); 52 } 53 54 #ifndef CONFIG_PPC_64K_PAGES 55 56 #define pgd_populate(MM, PGD, PUD) pgd_set(PGD, (unsigned long)PUD) 57 58 static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr) 59 { 60 return kmem_cache_alloc(PGT_CACHE(PUD_INDEX_SIZE), 61 GFP_KERNEL|__GFP_REPEAT); 62 } 63 64 static inline void pud_free(struct mm_struct *mm, pud_t *pud) 65 { 66 kmem_cache_free(PGT_CACHE(PUD_INDEX_SIZE), pud); 67 } 68 69 static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd) 70 { 71 pud_set(pud, (unsigned long)pmd); 72 } 73 74 static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd, 75 pte_t *pte) 76 { 77 pmd_set(pmd, (unsigned long)pte); 78 } 79 80 static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd, 81 pgtable_t pte_page) 82 { 83 pmd_set(pmd, (unsigned long)page_address(pte_page)); 84 } 85 86 #define pmd_pgtable(pmd) pmd_page(pmd) 87 88 static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm, 89 unsigned long address) 90 { 91 return (pte_t *)__get_free_page(GFP_KERNEL | __GFP_ZERO); 92 } 93 94 static inline pgtable_t pte_alloc_one(struct mm_struct *mm, 95 unsigned long address) 96 { 97 struct page *page; 98 pte_t *pte; 99 100 pte = pte_alloc_one_kernel(mm, address); 101 if (!pte) 102 return NULL; 103 page = virt_to_page(pte); 104 if (!pgtable_page_ctor(page)) { 105 __free_page(page); 106 return NULL; 107 } 108 return page; 109 } 110 111 static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte) 112 { 113 free_page((unsigned long)pte); 114 } 115 116 static inline void pte_free(struct mm_struct *mm, pgtable_t ptepage) 117 { 118 pgtable_page_dtor(ptepage); 119 __free_page(ptepage); 120 } 121 122 extern void pgtable_free_tlb(struct mmu_gather *tlb, void *table, int shift); 123 #ifdef CONFIG_SMP 124 extern void __tlb_remove_table(void *_table); 125 #endif 126 static inline void __pte_free_tlb(struct mmu_gather *tlb, pgtable_t table, 127 unsigned long address) 128 { 129 tlb_flush_pgtable(tlb, address); 130 pgtable_free_tlb(tlb, page_address(table), 0); 131 } 132 133 #else /* if CONFIG_PPC_64K_PAGES */ 134 135 extern pte_t *pte_fragment_alloc(struct mm_struct *, unsigned long, int); 136 extern void pte_fragment_free(unsigned long *, int); 137 extern void pgtable_free_tlb(struct mmu_gather *tlb, void *table, int shift); 138 #ifdef CONFIG_SMP 139 extern void __tlb_remove_table(void *_table); 140 #endif 141 142 #define pud_populate(mm, pud, pmd) pud_set(pud, (unsigned long)pmd) 143 144 static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd, 145 pte_t *pte) 146 { 147 pmd_set(pmd, (unsigned long)pte); 148 } 149 150 static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd, 151 pgtable_t pte_page) 152 { 153 pmd_set(pmd, (unsigned long)pte_page); 154 } 155 156 static inline pgtable_t pmd_pgtable(pmd_t pmd) 157 { 158 return (pgtable_t)(pmd_val(pmd) & ~PMD_MASKED_BITS); 159 } 160 161 static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm, 162 unsigned long address) 163 { 164 return (pte_t *)pte_fragment_alloc(mm, address, 1); 165 } 166 167 static inline pgtable_t pte_alloc_one(struct mm_struct *mm, 168 unsigned long address) 169 { 170 return (pgtable_t)pte_fragment_alloc(mm, address, 0); 171 } 172 173 static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte) 174 { 175 pte_fragment_free((unsigned long *)pte, 1); 176 } 177 178 static inline void pte_free(struct mm_struct *mm, pgtable_t ptepage) 179 { 180 pte_fragment_free((unsigned long *)ptepage, 0); 181 } 182 183 static inline void __pte_free_tlb(struct mmu_gather *tlb, pgtable_t table, 184 unsigned long address) 185 { 186 tlb_flush_pgtable(tlb, address); 187 pgtable_free_tlb(tlb, table, 0); 188 } 189 #endif /* CONFIG_PPC_64K_PAGES */ 190 191 static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long addr) 192 { 193 return kmem_cache_alloc(PGT_CACHE(PMD_CACHE_INDEX), 194 GFP_KERNEL|__GFP_REPEAT); 195 } 196 197 static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd) 198 { 199 kmem_cache_free(PGT_CACHE(PMD_CACHE_INDEX), pmd); 200 } 201 202 #define __pmd_free_tlb(tlb, pmd, addr) \ 203 pgtable_free_tlb(tlb, pmd, PMD_CACHE_INDEX) 204 #ifndef CONFIG_PPC_64K_PAGES 205 #define __pud_free_tlb(tlb, pud, addr) \ 206 pgtable_free_tlb(tlb, pud, PUD_INDEX_SIZE) 207 208 #endif /* CONFIG_PPC_64K_PAGES */ 209 210 #define check_pgt_cache() do { } while (0) 211 212 #endif /* _ASM_POWERPC_PGALLOC_64_H */ 213