arch/powerpc/include/asm/pgalloc-64.h

   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, 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 #define pmd_populate(mm, pmd, pte_page) \
  75         pmd_populate_kernel(mm, pmd, page_address(pte_page))
  76 #define pmd_populate_kernel(mm, pmd, pte) pmd_set(pmd, (unsigned long)(pte))
  77 #define pmd_pgtable(pmd) pmd_page(pmd)
  78
  79 static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
  80                                           unsigned long address)
  81 {
  82         return (pte_t *)__get_free_page(GFP_KERNEL | __GFP_REPEAT | __GFP_ZERO);
  83 }
  84
  85 static inline pgtable_t pte_alloc_one(struct mm_struct *mm,
  86                                       unsigned long address)
  87 {
  88         struct page *page;
  89         pte_t *pte;
  90
  91         pte = pte_alloc_one_kernel(mm, address);
  92         if (!pte)
  93                 return NULL;
  94         page = virt_to_page(pte);
  95         if (!pgtable_page_ctor(page)) {
  96                 __free_page(page);
  97                 return NULL;
  98         }
  99         return page;
 100 }
 101
 102 static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
 103 {
 104         free_page((unsigned long)pte);
 105 }
 106
 107 static inline void pte_free(struct mm_struct *mm, pgtable_t ptepage)
 108 {
 109         pgtable_page_dtor(ptepage);
 110         __free_page(ptepage);
 111 }
 112
 113 static inline void pgtable_free(void *table, unsigned index_size)
 114 {
 115         if (!index_size)
 116                 free_page((unsigned long)table);
 117         else {
 118                 BUG_ON(index_size > MAX_PGTABLE_INDEX_SIZE);
 119                 kmem_cache_free(PGT_CACHE(index_size), table);
 120         }
 121 }
 122
 123 #ifdef CONFIG_SMP
 124 static inline void pgtable_free_tlb(struct mmu_gather *tlb,
 125                                     void *table, int shift)
 126 {
 127         unsigned long pgf = (unsigned long)table;
 128         BUG_ON(shift > MAX_PGTABLE_INDEX_SIZE);
 129         pgf |= shift;
 130         tlb_remove_table(tlb, (void *)pgf);
 131 }
 132
 133 static inline void __tlb_remove_table(void *_table)
 134 {
 135         void *table = (void *)((unsigned long)_table & ~MAX_PGTABLE_INDEX_SIZE);
 136         unsigned shift = (unsigned long)_table & MAX_PGTABLE_INDEX_SIZE;
 137
 138         pgtable_free(table, shift);
 139 }
 140 #else /* !CONFIG_SMP */
 141 static inline void pgtable_free_tlb(struct mmu_gather *tlb,
 142                                     void *table, int shift)
 143 {
 144         pgtable_free(table, shift);
 145 }
 146 #endif /* CONFIG_SMP */
 147
 148 static inline void __pte_free_tlb(struct mmu_gather *tlb, pgtable_t table,
 149                                   unsigned long address)
 150 {
 151         tlb_flush_pgtable(tlb, address);
 152         pgtable_page_dtor(table);
 153         pgtable_free_tlb(tlb, page_address(table), 0);
 154 }
 155
 156 #else /* if CONFIG_PPC_64K_PAGES */
 157 /*
 158  * we support 16 fragments per PTE page.
 159  */
 160 #define PTE_FRAG_NR     16
 161 /*
 162  * We use a 2K PTE page fragment and another 2K for storing
 163  * real_pte_t hash index
 164  */
 165 #define PTE_FRAG_SIZE_SHIFT  12
 166 #define PTE_FRAG_SIZE (2 * PTRS_PER_PTE * sizeof(pte_t))
 167
 168 extern pte_t *page_table_alloc(struct mm_struct *, unsigned long, int);
 169 extern void page_table_free(struct mm_struct *, unsigned long *, int);
 170 extern void pgtable_free_tlb(struct mmu_gather *tlb, void *table, int shift);
 171 #ifdef CONFIG_SMP
 172 extern void __tlb_remove_table(void *_table);
 173 #endif
 174
 175 #define pud_populate(mm, pud, pmd)      pud_set(pud, (unsigned long)pmd)
 176
 177 static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd,
 178                                        pte_t *pte)
 179 {
 180         pmd_set(pmd, (unsigned long)pte);
 181 }
 182
 183 static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd,
 184                                 pgtable_t pte_page)
 185 {
 186         pmd_set(pmd, (unsigned long)pte_page);
 187 }
 188
 189 static inline pgtable_t pmd_pgtable(pmd_t pmd)
 190 {
 191         return (pgtable_t)(pmd_val(pmd) & ~PMD_MASKED_BITS);
 192 }
 193
 194 static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
 195                                           unsigned long address)
 196 {
 197         return (pte_t *)page_table_alloc(mm, address, 1);
 198 }
 199
 200 static inline pgtable_t pte_alloc_one(struct mm_struct *mm,
 201                                         unsigned long address)
 202 {
 203         return (pgtable_t)page_table_alloc(mm, address, 0);
 204 }
 205
 206 static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
 207 {
 208         page_table_free(mm, (unsigned long *)pte, 1);
 209 }
 210
 211 static inline void pte_free(struct mm_struct *mm, pgtable_t ptepage)
 212 {
 213         page_table_free(mm, (unsigned long *)ptepage, 0);
 214 }
 215
 216 static inline void __pte_free_tlb(struct mmu_gather *tlb, pgtable_t table,
 217                                   unsigned long address)
 218 {
 219         tlb_flush_pgtable(tlb, address);
 220         pgtable_free_tlb(tlb, table, 0);
 221 }
 222 #endif /* CONFIG_PPC_64K_PAGES */
 223
 224 static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long addr)
 225 {
 226         return kmem_cache_alloc(PGT_CACHE(PMD_CACHE_INDEX),
 227                                 GFP_KERNEL|__GFP_REPEAT);
 228 }
 229
 230 static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
 231 {
 232         kmem_cache_free(PGT_CACHE(PMD_CACHE_INDEX), pmd);
 233 }
 234
 235 #define __pmd_free_tlb(tlb, pmd, addr)                \
 236         pgtable_free_tlb(tlb, pmd, PMD_CACHE_INDEX)
 237 #ifndef CONFIG_PPC_64K_PAGES
 238 #define __pud_free_tlb(tlb, pud, addr)                \
 239         pgtable_free_tlb(tlb, pud, PUD_INDEX_SIZE)
 240
 241 #endif /* CONFIG_PPC_64K_PAGES */
 242
 243 #define check_pgt_cache()       do { } while (0)
 244
 245 #endif /* _ASM_POWERPC_PGALLOC_64_H */