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
  20 /*
  21  * Functions that deal with pagetables that could be at any level of
  22  * the table need to be passed an "index_size" so they know how to
  23  * handle allocation.  For PTE pages (which are linked to a struct
  24  * page for now, and drawn from the main get_free_pages() pool), the
  25  * allocation size will be (2^index_size * sizeof(pointer)) and
  26  * allocations are drawn from the kmem_cache in PGT_CACHE(index_size).
  27  *
  28  * The maximum index size needs to be big enough to allow any
  29  * pagetable sizes we need, but small enough to fit in the low bits of
  30  * any page table pointer.  In other words all pagetables, even tiny
  31  * ones, must be aligned to allow at least enough low 0 bits to
  32  * contain this value.  This value is also used as a mask, so it must
  33  * be one less than a power of two.
  34  */
  35 #define MAX_PGTABLE_INDEX_SIZE  0xf
  36
  37 extern struct kmem_cache *pgtable_cache[];
  38 #define PGT_CACHE(shift) ({                             \
  39                         BUG_ON(!(shift));               \
  40                         pgtable_cache[(shift) - 1];     \
  41                 })
  42
  43 static inline pgd_t *pgd_alloc(struct mm_struct *mm)
  44 {
  45         return kmem_cache_alloc(PGT_CACHE(PGD_INDEX_SIZE), GFP_KERNEL);
  46 }
  47
  48 static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
  49 {
  50         kmem_cache_free(PGT_CACHE(PGD_INDEX_SIZE), pgd);
  51 }
  52
  53 #ifndef CONFIG_PPC_64K_PAGES
  54
  55 #define pgd_populate(MM, PGD, PUD)      pgd_set(PGD, PUD)
  56
  57 static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr)
  58 {
  59         return kmem_cache_alloc(PGT_CACHE(PUD_INDEX_SIZE),
  60                                 GFP_KERNEL|__GFP_REPEAT);
  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 #define pmd_populate(mm, pmd, pte_page) \
  74         pmd_populate_kernel(mm, pmd, page_address(pte_page))
  75 #define pmd_populate_kernel(mm, pmd, pte) pmd_set(pmd, (unsigned long)(pte))
  76 #define pmd_pgtable(pmd) pmd_page(pmd)
  77
  78 static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
  79                                           unsigned long address)
  80 {
  81         return (pte_t *)__get_free_page(GFP_KERNEL | __GFP_REPEAT | __GFP_ZERO);
  82 }
  83
  84 static inline pgtable_t pte_alloc_one(struct mm_struct *mm,
  85                                       unsigned long address)
  86 {
  87         struct page *page;
  88         pte_t *pte;
  89
  90         pte = pte_alloc_one_kernel(mm, address);
  91         if (!pte)
  92                 return NULL;
  93         page = virt_to_page(pte);
  94         pgtable_page_ctor(page);
  95         return page;
  96 }
  97
  98 static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
  99 {
 100         free_page((unsigned long)pte);
 101 }
 102
 103 static inline void pte_free(struct mm_struct *mm, pgtable_t ptepage)
 104 {
 105         pgtable_page_dtor(ptepage);
 106         __free_page(ptepage);
 107 }
 108
 109 static inline void pgtable_free(void *table, unsigned index_size)
 110 {
 111         if (!index_size)
 112                 free_page((unsigned long)table);
 113         else {
 114                 BUG_ON(index_size > MAX_PGTABLE_INDEX_SIZE);
 115                 kmem_cache_free(PGT_CACHE(index_size), table);
 116         }
 117 }
 118
 119 #ifdef CONFIG_SMP
 120 static inline void pgtable_free_tlb(struct mmu_gather *tlb,
 121                                     void *table, int shift)
 122 {
 123         unsigned long pgf = (unsigned long)table;
 124         BUG_ON(shift > MAX_PGTABLE_INDEX_SIZE);
 125         pgf |= shift;
 126         tlb_remove_table(tlb, (void *)pgf);
 127 }
 128
 129 static inline void __tlb_remove_table(void *_table)
 130 {
 131         void *table = (void *)((unsigned long)_table & ~MAX_PGTABLE_INDEX_SIZE);
 132         unsigned shift = (unsigned long)_table & MAX_PGTABLE_INDEX_SIZE;
 133
 134         pgtable_free(table, shift);
 135 }
 136 #else /* !CONFIG_SMP */
 137 static inline void pgtable_free_tlb(struct mmu_gather *tlb,
 138                                     void *table, int shift)
 139 {
 140         pgtable_free(table, shift);
 141 }
 142 #endif /* CONFIG_SMP */
 143
 144 static inline void __pte_free_tlb(struct mmu_gather *tlb, pgtable_t table,
 145                                   unsigned long address)
 146 {
 147         tlb_flush_pgtable(tlb, address);
 148         pgtable_page_dtor(table);
 149         pgtable_free_tlb(tlb, page_address(table), 0);
 150 }
 151
 152 #else /* if CONFIG_PPC_64K_PAGES */
 153 /*
 154  * we support 16 fragments per PTE page.
 155  */
 156 #define PTE_FRAG_NR     16
 157 /*
 158  * We use a 2K PTE page fragment and another 2K for storing
 159  * real_pte_t hash index
 160  */
 161 #define PTE_FRAG_SIZE_SHIFT  12
 162 #define PTE_FRAG_SIZE (2 * PTRS_PER_PTE * sizeof(pte_t))
 163
 164 extern pte_t *page_table_alloc(struct mm_struct *, unsigned long, int);
 165 extern void page_table_free(struct mm_struct *, unsigned long *, int);
 166 extern void pgtable_free_tlb(struct mmu_gather *tlb, void *table, int shift);
 167 #ifdef CONFIG_SMP
 168 extern void __tlb_remove_table(void *_table);
 169 #endif
 170
 171 #define pud_populate(mm, pud, pmd)      pud_set(pud, (unsigned long)pmd)
 172
 173 static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd,
 174                                        pte_t *pte)
 175 {
 176         pmd_set(pmd, (unsigned long)pte);
 177 }
 178
 179 static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd,
 180                                 pgtable_t pte_page)
 181 {
 182         pmd_set(pmd, (unsigned long)pte_page);
 183 }
 184
 185 static inline pgtable_t pmd_pgtable(pmd_t pmd)
 186 {
 187         return (pgtable_t)(pmd_val(pmd) & ~PMD_MASKED_BITS);
 188 }
 189
 190 static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
 191                                           unsigned long address)
 192 {
 193         return (pte_t *)page_table_alloc(mm, address, 1);
 194 }
 195
 196 static inline pgtable_t pte_alloc_one(struct mm_struct *mm,
 197                                         unsigned long address)
 198 {
 199         return (pgtable_t)page_table_alloc(mm, address, 0);
 200 }
 201
 202 static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
 203 {
 204         page_table_free(mm, (unsigned long *)pte, 1);
 205 }
 206
 207 static inline void pte_free(struct mm_struct *mm, pgtable_t ptepage)
 208 {
 209         page_table_free(mm, (unsigned long *)ptepage, 0);
 210 }
 211
 212 static inline void __pte_free_tlb(struct mmu_gather *tlb, pgtable_t table,
 213                                   unsigned long address)
 214 {
 215         tlb_flush_pgtable(tlb, address);
 216         pgtable_free_tlb(tlb, table, 0);
 217 }
 218 #endif /* CONFIG_PPC_64K_PAGES */
 219
 220 static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long addr)
 221 {
 222         return kmem_cache_alloc(PGT_CACHE(PMD_CACHE_INDEX),
 223                                 GFP_KERNEL|__GFP_REPEAT);
 224 }
 225
 226 static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
 227 {
 228         kmem_cache_free(PGT_CACHE(PMD_CACHE_INDEX), pmd);
 229 }
 230
 231 #define __pmd_free_tlb(tlb, pmd, addr)                \
 232         pgtable_free_tlb(tlb, pmd, PMD_CACHE_INDEX)
 233 #ifndef CONFIG_PPC_64K_PAGES
 234 #define __pud_free_tlb(tlb, pud, addr)                \
 235         pgtable_free_tlb(tlb, pud, PUD_INDEX_SIZE)
 236
 237 #endif /* CONFIG_PPC_64K_PAGES */
 238
 239 #define check_pgt_cache()       do { } while (0)
 240
 241 #endif /* _ASM_POWERPC_PGALLOC_64_H */