arch/powerpc/include/asm/book3s/64/pgalloc.h

   1 #ifndef _ASM_POWERPC_BOOK3S_64_PGALLOC_H
   2 #define _ASM_POWERPC_BOOK3S_64_PGALLOC_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 extern pte_t *pte_fragment_alloc(struct mm_struct *, unsigned long, int);
  45 extern void pte_fragment_free(unsigned long *, int);
  46 extern void pgtable_free_tlb(struct mmu_gather *tlb, void *table, int shift);
  47 #ifdef CONFIG_SMP
  48 extern void __tlb_remove_table(void *_table);
  49 #endif
  50
  51 static inline pgd_t *radix__pgd_alloc(struct mm_struct *mm)
  52 {
  53 #ifdef CONFIG_PPC_64K_PAGES
  54         return (pgd_t *)__get_free_page(pgtable_gfp_flags(mm, PGALLOC_GFP));
  55 #else
  56         struct page *page;
  57         page = alloc_pages(pgtable_gfp_flags(mm, PGALLOC_GFP | __GFP_RETRY_MAYFAIL),
  58                                 4);
  59         if (!page)
  60                 return NULL;
  61         return (pgd_t *) page_address(page);
  62 #endif
  63 }
  64
  65 static inline void radix__pgd_free(struct mm_struct *mm, pgd_t *pgd)
  66 {
  67 #ifdef CONFIG_PPC_64K_PAGES
  68         free_page((unsigned long)pgd);
  69 #else
  70         free_pages((unsigned long)pgd, 4);
  71 #endif
  72 }
  73
  74 static inline pgd_t *pgd_alloc(struct mm_struct *mm)
  75 {
  76         pgd_t *pgd;
  77
  78         if (radix_enabled())
  79                 return radix__pgd_alloc(mm);
  80
  81         pgd = kmem_cache_alloc(PGT_CACHE(PGD_INDEX_SIZE),
  82                                pgtable_gfp_flags(mm, GFP_KERNEL));
  83         memset(pgd, 0, PGD_TABLE_SIZE);
  84
  85         return pgd;
  86 }
  87
  88 static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
  89 {
  90         if (radix_enabled())
  91                 return radix__pgd_free(mm, pgd);
  92         kmem_cache_free(PGT_CACHE(PGD_INDEX_SIZE), pgd);
  93 }
  94
  95 static inline void pgd_populate(struct mm_struct *mm, pgd_t *pgd, pud_t *pud)
  96 {
  97         pgd_set(pgd, __pgtable_ptr_val(pud) | PGD_VAL_BITS);
  98 }
  99
 100 static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr)
 101 {
 102         return kmem_cache_alloc(PGT_CACHE(PUD_CACHE_INDEX),
 103                 pgtable_gfp_flags(mm, GFP_KERNEL));
 104 }
 105
 106 static inline void pud_free(struct mm_struct *mm, pud_t *pud)
 107 {
 108         kmem_cache_free(PGT_CACHE(PUD_CACHE_INDEX), pud);
 109 }
 110
 111 static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
 112 {
 113         pud_set(pud, __pgtable_ptr_val(pmd) | PUD_VAL_BITS);
 114 }
 115
 116 static inline void __pud_free_tlb(struct mmu_gather *tlb, pud_t *pud,
 117                                   unsigned long address)
 118 {
 119         /*
 120          * By now all the pud entries should be none entries. So go
 121          * ahead and flush the page walk cache
 122          */
 123         flush_tlb_pgtable(tlb, address);
 124         pgtable_free_tlb(tlb, pud, PUD_CACHE_INDEX);
 125 }
 126
 127 static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long addr)
 128 {
 129         return kmem_cache_alloc(PGT_CACHE(PMD_CACHE_INDEX),
 130                 pgtable_gfp_flags(mm, GFP_KERNEL));
 131 }
 132
 133 static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
 134 {
 135         kmem_cache_free(PGT_CACHE(PMD_CACHE_INDEX), pmd);
 136 }
 137
 138 static inline void __pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmd,
 139                                   unsigned long address)
 140 {
 141         /*
 142          * By now all the pud entries should be none entries. So go
 143          * ahead and flush the page walk cache
 144          */
 145         flush_tlb_pgtable(tlb, address);
 146         return pgtable_free_tlb(tlb, pmd, PMD_CACHE_INDEX);
 147 }
 148
 149 static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd,
 150                                        pte_t *pte)
 151 {
 152         pmd_set(pmd, __pgtable_ptr_val(pte) | PMD_VAL_BITS);
 153 }
 154
 155 static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd,
 156                                 pgtable_t pte_page)
 157 {
 158         pmd_set(pmd, __pgtable_ptr_val(pte_page) | PMD_VAL_BITS);
 159 }
 160
 161 static inline pgtable_t pmd_pgtable(pmd_t pmd)
 162 {
 163         return (pgtable_t)pmd_page_vaddr(pmd);
 164 }
 165
 166 #ifdef CONFIG_PPC_4K_PAGES
 167 static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
 168                                           unsigned long address)
 169 {
 170         return (pte_t *)__get_free_page(GFP_KERNEL | __GFP_ZERO);
 171 }
 172
 173 static inline pgtable_t pte_alloc_one(struct mm_struct *mm,
 174                                       unsigned long address)
 175 {
 176         struct page *page;
 177         pte_t *pte;
 178
 179         pte = (pte_t *)__get_free_page(GFP_KERNEL | __GFP_ZERO | __GFP_ACCOUNT);
 180         if (!pte)
 181                 return NULL;
 182         page = virt_to_page(pte);
 183         if (!pgtable_page_ctor(page)) {
 184                 __free_page(page);
 185                 return NULL;
 186         }
 187         return pte;
 188 }
 189 #else /* if CONFIG_PPC_64K_PAGES */
 190
 191 static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
 192                                           unsigned long address)
 193 {
 194         return (pte_t *)pte_fragment_alloc(mm, address, 1);
 195 }
 196
 197 static inline pgtable_t pte_alloc_one(struct mm_struct *mm,
 198                                       unsigned long address)
 199 {
 200         return (pgtable_t)pte_fragment_alloc(mm, address, 0);
 201 }
 202 #endif
 203
 204 static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
 205 {
 206         pte_fragment_free((unsigned long *)pte, 1);
 207 }
 208
 209 static inline void pte_free(struct mm_struct *mm, pgtable_t ptepage)
 210 {
 211         pte_fragment_free((unsigned long *)ptepage, 0);
 212 }
 213
 214 static inline void __pte_free_tlb(struct mmu_gather *tlb, pgtable_t table,
 215                                   unsigned long address)
 216 {
 217         /*
 218          * By now all the pud entries should be none entries. So go
 219          * ahead and flush the page walk cache
 220          */
 221         flush_tlb_pgtable(tlb, address);
 222         pgtable_free_tlb(tlb, table, 0);
 223 }
 224
 225 #define check_pgt_cache()       do { } while (0)
 226
 227 #endif /* _ASM_POWERPC_BOOK3S_64_PGALLOC_H */