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) (pgtable_cache[(shift)-1])
  39
  40 static inline pgd_t *pgd_alloc(struct mm_struct *mm)
  41 {
  42         return kmem_cache_alloc(PGT_CACHE(PGD_INDEX_SIZE), GFP_KERNEL);
  43 }
  44
  45 static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
  46 {
  47         kmem_cache_free(PGT_CACHE(PGD_INDEX_SIZE), pgd);
  48 }
  49
  50 #ifndef CONFIG_PPC_64K_PAGES
  51
  52 #define pgd_populate(MM, PGD, PUD)      pgd_set(PGD, PUD)
  53
  54 static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr)
  55 {
  56         return kmem_cache_alloc(PGT_CACHE(PUD_INDEX_SIZE),
  57                                 GFP_KERNEL|__GFP_REPEAT);
  58 }
  59
  60 static inline void pud_free(struct mm_struct *mm, pud_t *pud)
  61 {
  62         kmem_cache_free(PGT_CACHE(PUD_INDEX_SIZE), pud);
  63 }
  64
  65 static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
  66 {
  67         pud_set(pud, (unsigned long)pmd);
  68 }
  69
  70 #define pmd_populate(mm, pmd, pte_page) \
  71         pmd_populate_kernel(mm, pmd, page_address(pte_page))
  72 #define pmd_populate_kernel(mm, pmd, pte) pmd_set(pmd, (unsigned long)(pte))
  73 #define pmd_pgtable(pmd) pmd_page(pmd)
  74
  75
  76 #else /* CONFIG_PPC_64K_PAGES */
  77
  78 #define pud_populate(mm, pud, pmd)      pud_set(pud, (unsigned long)pmd)
  79
  80 static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd,
  81                                        pte_t *pte)
  82 {
  83         pmd_set(pmd, (unsigned long)pte);
  84 }
  85
  86 #define pmd_populate(mm, pmd, pte_page) \
  87         pmd_populate_kernel(mm, pmd, page_address(pte_page))
  88 #define pmd_pgtable(pmd) pmd_page(pmd)
  89
  90 #endif /* CONFIG_PPC_64K_PAGES */
  91
  92 static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long addr)
  93 {
  94         return kmem_cache_alloc(PGT_CACHE(PMD_INDEX_SIZE),
  95                                 GFP_KERNEL|__GFP_REPEAT);
  96 }
  97
  98 static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
  99 {
 100         kmem_cache_free(PGT_CACHE(PMD_INDEX_SIZE), pmd);
 101 }
 102
 103 static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
 104                                           unsigned long address)
 105 {
 106         return (pte_t *)__get_free_page(GFP_KERNEL | __GFP_REPEAT | __GFP_ZERO);
 107 }
 108
 109 static inline pgtable_t pte_alloc_one(struct mm_struct *mm,
 110                                         unsigned long address)
 111 {
 112         struct page *page;
 113         pte_t *pte;
 114
 115         pte = pte_alloc_one_kernel(mm, address);
 116         if (!pte)
 117                 return NULL;
 118         page = virt_to_page(pte);
 119         pgtable_page_ctor(page);
 120         return page;
 121 }
 122
 123 static inline void pgtable_free(void *table, unsigned index_size)
 124 {
 125         if (!index_size)
 126                 free_page((unsigned long)table);
 127         else {
 128                 BUG_ON(index_size > MAX_PGTABLE_INDEX_SIZE);
 129                 kmem_cache_free(PGT_CACHE(index_size), table);
 130         }
 131 }
 132
 133 #define __pmd_free_tlb(tlb, pmd, addr)                \
 134         pgtable_free_tlb(tlb, pmd, PMD_INDEX_SIZE)
 135 #ifndef CONFIG_PPC_64K_PAGES
 136 #define __pud_free_tlb(tlb, pud, addr)                \
 137         pgtable_free_tlb(tlb, pud, PUD_INDEX_SIZE)
 138
 139 #endif /* CONFIG_PPC_64K_PAGES */
 140
 141 #define check_pgt_cache()       do { } while (0)
 142
 143 #endif /* _ASM_POWERPC_PGALLOC_64_H */