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), GFP_KERNEL); 61 } 62 63 static inline void pud_free(struct mm_struct *mm, pud_t *pud) 64 { 65 kmem_cache_free(PGT_CACHE(PUD_INDEX_SIZE), pud); 66 } 67 68 static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd) 69 { 70 pud_set(pud, (unsigned long)pmd); 71 } 72 73 static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd, 74 pte_t *pte) 75 { 76 pmd_set(pmd, (unsigned long)pte); 77 } 78 79 static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd, 80 pgtable_t pte_page) 81 { 82 pmd_set(pmd, (unsigned long)page_address(pte_page)); 83 } 84 85 #define pmd_pgtable(pmd) pmd_page(pmd) 86 87 static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm, 88 unsigned long address) 89 { 90 return (pte_t *)__get_free_page(GFP_KERNEL | __GFP_ZERO); 91 } 92 93 static inline pgtable_t pte_alloc_one(struct mm_struct *mm, 94 unsigned long address) 95 { 96 struct page *page; 97 pte_t *pte; 98 99 pte = pte_alloc_one_kernel(mm, address); 100 if (!pte) 101 return NULL; 102 page = virt_to_page(pte); 103 if (!pgtable_page_ctor(page)) { 104 __free_page(page); 105 return NULL; 106 } 107 return page; 108 } 109 110 static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte) 111 { 112 free_page((unsigned long)pte); 113 } 114 115 static inline void pte_free(struct mm_struct *mm, pgtable_t ptepage) 116 { 117 pgtable_page_dtor(ptepage); 118 __free_page(ptepage); 119 } 120 121 extern void pgtable_free_tlb(struct mmu_gather *tlb, void *table, int shift); 122 #ifdef CONFIG_SMP 123 extern void __tlb_remove_table(void *_table); 124 #endif 125 static inline void __pte_free_tlb(struct mmu_gather *tlb, pgtable_t table, 126 unsigned long address) 127 { 128 tlb_flush_pgtable(tlb, address); 129 pgtable_free_tlb(tlb, page_address(table), 0); 130 } 131 132 #else /* if CONFIG_PPC_64K_PAGES */ 133 134 extern pte_t *pte_fragment_alloc(struct mm_struct *, unsigned long, int); 135 extern void pte_fragment_free(unsigned long *, int); 136 extern void pgtable_free_tlb(struct mmu_gather *tlb, void *table, int shift); 137 #ifdef CONFIG_SMP 138 extern void __tlb_remove_table(void *_table); 139 #endif 140 141 #define pud_populate(mm, pud, pmd) pud_set(pud, (unsigned long)pmd) 142 143 static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd, 144 pte_t *pte) 145 { 146 pmd_set(pmd, (unsigned long)pte); 147 } 148 149 static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd, 150 pgtable_t pte_page) 151 { 152 pmd_set(pmd, (unsigned long)pte_page); 153 } 154 155 static inline pgtable_t pmd_pgtable(pmd_t pmd) 156 { 157 return (pgtable_t)(pmd_val(pmd) & ~PMD_MASKED_BITS); 158 } 159 160 static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm, 161 unsigned long address) 162 { 163 return (pte_t *)pte_fragment_alloc(mm, address, 1); 164 } 165 166 static inline pgtable_t pte_alloc_one(struct mm_struct *mm, 167 unsigned long address) 168 { 169 return (pgtable_t)pte_fragment_alloc(mm, address, 0); 170 } 171 172 static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte) 173 { 174 pte_fragment_free((unsigned long *)pte, 1); 175 } 176 177 static inline void pte_free(struct mm_struct *mm, pgtable_t ptepage) 178 { 179 pte_fragment_free((unsigned long *)ptepage, 0); 180 } 181 182 static inline void __pte_free_tlb(struct mmu_gather *tlb, pgtable_t table, 183 unsigned long address) 184 { 185 tlb_flush_pgtable(tlb, address); 186 pgtable_free_tlb(tlb, table, 0); 187 } 188 #endif /* CONFIG_PPC_64K_PAGES */ 189 190 static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long addr) 191 { 192 return kmem_cache_alloc(PGT_CACHE(PMD_CACHE_INDEX), GFP_KERNEL); 193 } 194 195 static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd) 196 { 197 kmem_cache_free(PGT_CACHE(PMD_CACHE_INDEX), pmd); 198 } 199 200 #define __pmd_free_tlb(tlb, pmd, addr) \ 201 pgtable_free_tlb(tlb, pmd, PMD_CACHE_INDEX) 202 #ifndef CONFIG_PPC_64K_PAGES 203 #define __pud_free_tlb(tlb, pud, addr) \ 204 pgtable_free_tlb(tlb, pud, PUD_INDEX_SIZE) 205 206 #endif /* CONFIG_PPC_64K_PAGES */ 207 208 #define check_pgt_cache() do { } while (0) 209 210 #endif /* _ASM_POWERPC_PGALLOC_64_H */ 211