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_REPEAT | __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 static inline void pgtable_free(void *table, unsigned index_size) 123 { 124 if (!index_size) 125 free_page((unsigned long)table); 126 else { 127 BUG_ON(index_size > MAX_PGTABLE_INDEX_SIZE); 128 kmem_cache_free(PGT_CACHE(index_size), table); 129 } 130 } 131 132 #ifdef CONFIG_SMP 133 static inline void pgtable_free_tlb(struct mmu_gather *tlb, 134 void *table, int shift) 135 { 136 unsigned long pgf = (unsigned long)table; 137 BUG_ON(shift > MAX_PGTABLE_INDEX_SIZE); 138 pgf |= shift; 139 tlb_remove_table(tlb, (void *)pgf); 140 } 141 142 static inline void __tlb_remove_table(void *_table) 143 { 144 void *table = (void *)((unsigned long)_table & ~MAX_PGTABLE_INDEX_SIZE); 145 unsigned shift = (unsigned long)_table & MAX_PGTABLE_INDEX_SIZE; 146 147 pgtable_free(table, shift); 148 } 149 #else /* !CONFIG_SMP */ 150 static inline void pgtable_free_tlb(struct mmu_gather *tlb, 151 void *table, int shift) 152 { 153 pgtable_free(table, shift); 154 } 155 #endif /* CONFIG_SMP */ 156 157 static inline void __pte_free_tlb(struct mmu_gather *tlb, pgtable_t table, 158 unsigned long address) 159 { 160 tlb_flush_pgtable(tlb, address); 161 pgtable_page_dtor(table); 162 pgtable_free_tlb(tlb, page_address(table), 0); 163 } 164 165 #else /* if CONFIG_PPC_64K_PAGES */ 166 167 extern pte_t *page_table_alloc(struct mm_struct *, unsigned long, int); 168 extern void page_table_free(struct mm_struct *, unsigned long *, int); 169 extern void pgtable_free_tlb(struct mmu_gather *tlb, void *table, int shift); 170 #ifdef CONFIG_SMP 171 extern void __tlb_remove_table(void *_table); 172 #endif 173 174 #define pud_populate(mm, pud, pmd) pud_set(pud, (unsigned long)pmd) 175 176 static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd, 177 pte_t *pte) 178 { 179 pmd_set(pmd, (unsigned long)pte); 180 } 181 182 static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd, 183 pgtable_t pte_page) 184 { 185 pmd_set(pmd, (unsigned long)pte_page); 186 } 187 188 static inline pgtable_t pmd_pgtable(pmd_t pmd) 189 { 190 return (pgtable_t)(pmd_val(pmd) & ~PMD_MASKED_BITS); 191 } 192 193 static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm, 194 unsigned long address) 195 { 196 return (pte_t *)page_table_alloc(mm, address, 1); 197 } 198 199 static inline pgtable_t pte_alloc_one(struct mm_struct *mm, 200 unsigned long address) 201 { 202 return (pgtable_t)page_table_alloc(mm, address, 0); 203 } 204 205 static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte) 206 { 207 page_table_free(mm, (unsigned long *)pte, 1); 208 } 209 210 static inline void pte_free(struct mm_struct *mm, pgtable_t ptepage) 211 { 212 page_table_free(mm, (unsigned long *)ptepage, 0); 213 } 214 215 static inline void __pte_free_tlb(struct mmu_gather *tlb, pgtable_t table, 216 unsigned long address) 217 { 218 tlb_flush_pgtable(tlb, address); 219 pgtable_free_tlb(tlb, table, 0); 220 } 221 #endif /* CONFIG_PPC_64K_PAGES */ 222 223 static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long addr) 224 { 225 return kmem_cache_alloc(PGT_CACHE(PMD_CACHE_INDEX), 226 GFP_KERNEL|__GFP_REPEAT); 227 } 228 229 static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd) 230 { 231 kmem_cache_free(PGT_CACHE(PMD_CACHE_INDEX), pmd); 232 } 233 234 #define __pmd_free_tlb(tlb, pmd, addr) \ 235 pgtable_free_tlb(tlb, pmd, PMD_CACHE_INDEX) 236 #ifndef CONFIG_PPC_64K_PAGES 237 #define __pud_free_tlb(tlb, pud, addr) \ 238 pgtable_free_tlb(tlb, pud, PUD_INDEX_SIZE) 239 240 #endif /* CONFIG_PPC_64K_PAGES */ 241 242 #define check_pgt_cache() do { } while (0) 243 244 #endif /* _ASM_POWERPC_PGALLOC_64_H */ 245