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 /*
  15  * Functions that deal with pagetables that could be at any level of
  16  * the table need to be passed an "index_size" so they know how to
  17  * handle allocation.  For PTE pages (which are linked to a struct
  18  * page for now, and drawn from the main get_free_pages() pool), the
  19  * allocation size will be (2^index_size * sizeof(pointer)) and
  20  * allocations are drawn from the kmem_cache in PGT_CACHE(index_size).
  21  *
  22  * The maximum index size needs to be big enough to allow any
  23  * pagetable sizes we need, but small enough to fit in the low bits of
  24  * any page table pointer.  In other words all pagetables, even tiny
  25  * ones, must be aligned to allow at least enough low 0 bits to
  26  * contain this value.  This value is also used as a mask, so it must
  27  * be one less than a power of two.
  28  */
  29 #define MAX_PGTABLE_INDEX_SIZE  0xf
  30
  31 extern struct kmem_cache *pgtable_cache[];
  32 #define PGT_CACHE(shift) (pgtable_cache[(shift)-1])
  33
  34 static inline pgd_t *pgd_alloc(struct mm_struct *mm)
  35 {
  36         return kmem_cache_alloc(PGT_CACHE(PGD_INDEX_SIZE), GFP_KERNEL);
  37 }
  38
  39 static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
  40 {
  41         kmem_cache_free(PGT_CACHE(PGD_INDEX_SIZE), pgd);
  42 }
  43
  44 #ifndef CONFIG_PPC_64K_PAGES
  45
  46 #define pgd_populate(MM, PGD, PUD)      pgd_set(PGD, PUD)
  47
  48 static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr)
  49 {
  50         return kmem_cache_alloc(PGT_CACHE(PUD_INDEX_SIZE),
  51                                 GFP_KERNEL|__GFP_REPEAT);
  52 }
  53
  54 static inline void pud_free(struct mm_struct *mm, pud_t *pud)
  55 {
  56         kmem_cache_free(PGT_CACHE(PUD_INDEX_SIZE), pud);
  57 }
  58
  59 static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
  60 {
  61         pud_set(pud, (unsigned long)pmd);
  62 }
  63
  64 #define pmd_populate(mm, pmd, pte_page) \
  65         pmd_populate_kernel(mm, pmd, page_address(pte_page))
  66 #define pmd_populate_kernel(mm, pmd, pte) pmd_set(pmd, (unsigned long)(pte))
  67 #define pmd_pgtable(pmd) pmd_page(pmd)
  68
  69
  70 #else /* CONFIG_PPC_64K_PAGES */
  71
  72 #define pud_populate(mm, pud, pmd)      pud_set(pud, (unsigned long)pmd)
  73
  74 static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd,
  75                                        pte_t *pte)
  76 {
  77         pmd_set(pmd, (unsigned long)pte);
  78 }
  79
  80 #define pmd_populate(mm, pmd, pte_page) \
  81         pmd_populate_kernel(mm, pmd, page_address(pte_page))
  82 #define pmd_pgtable(pmd) pmd_page(pmd)
  83
  84 #endif /* CONFIG_PPC_64K_PAGES */
  85
  86 static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long addr)
  87 {
  88         return kmem_cache_alloc(PGT_CACHE(PMD_INDEX_SIZE),
  89                                 GFP_KERNEL|__GFP_REPEAT);
  90 }
  91
  92 static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
  93 {
  94         kmem_cache_free(PGT_CACHE(PMD_INDEX_SIZE), pmd);
  95 }
  96
  97 static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
  98                                           unsigned long address)
  99 {
 100         return (pte_t *)__get_free_page(GFP_KERNEL | __GFP_REPEAT | __GFP_ZERO);
 101 }
 102
 103 static inline pgtable_t pte_alloc_one(struct mm_struct *mm,
 104                                         unsigned long address)
 105 {
 106         struct page *page;
 107         pte_t *pte;
 108
 109         pte = pte_alloc_one_kernel(mm, address);
 110         if (!pte)
 111                 return NULL;
 112         page = virt_to_page(pte);
 113         pgtable_page_ctor(page);
 114         return page;
 115 }
 116
 117 static inline void pgtable_free(void *table, unsigned index_size)
 118 {
 119         if (!index_size)
 120                 free_page((unsigned long)table);
 121         else {
 122                 BUG_ON(index_size > MAX_PGTABLE_INDEX_SIZE);
 123                 kmem_cache_free(PGT_CACHE(index_size), table);
 124         }
 125 }
 126
 127 #define __pmd_free_tlb(tlb, pmd, addr)                \
 128         pgtable_free_tlb(tlb, pmd, PMD_INDEX_SIZE)
 129 #ifndef CONFIG_PPC_64K_PAGES
 130 #define __pud_free_tlb(tlb, pud, addr)                \
 131         pgtable_free_tlb(tlb, pud, PUD_INDEX_SIZE)
 132
 133 #endif /* CONFIG_PPC_64K_PAGES */
 134
 135 #define check_pgt_cache()       do { } while (0)
 136
 137 #endif /* _ASM_POWERPC_PGALLOC_64_H */