arch/powerpc/include/asm/nohash/64/pgalloc.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, (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 */