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   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/mm.h>
  11 #include <linux/slab.h>
  12 #include <linux/cpumask.h>
  13 #include <linux/percpu.h>
  14
  15 extern struct kmem_cache *pgtable_cache[];
  16
  17 #define PGD_CACHE_NUM           0
  18 #define PUD_CACHE_NUM           1
  19 #define PMD_CACHE_NUM           1
  20 #define HUGEPTE_CACHE_NUM       2
  21 #define PTE_NONCACHE_NUM        3  /* from GFP rather than kmem_cache */
  22
  23 static inline pgd_t *pgd_alloc(struct mm_struct *mm)
  24 {
  25         return kmem_cache_alloc(pgtable_cache[PGD_CACHE_NUM], GFP_KERNEL);
  26 }
  27
  28 static inline void pgd_free(pgd_t *pgd)
  29 {
  30         kmem_cache_free(pgtable_cache[PGD_CACHE_NUM], pgd);
  31 }
  32
  33 #ifndef CONFIG_PPC_64K_PAGES
  34
  35 #define pgd_populate(MM, PGD, PUD)      pgd_set(PGD, PUD)
  36
  37 static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr)
  38 {
  39         return kmem_cache_alloc(pgtable_cache[PUD_CACHE_NUM],
  40                                 GFP_KERNEL|__GFP_REPEAT);
  41 }
  42
  43 static inline void pud_free(pud_t *pud)
  44 {
  45         kmem_cache_free(pgtable_cache[PUD_CACHE_NUM], pud);
  46 }
  47
  48 static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
  49 {
  50         pud_set(pud, (unsigned long)pmd);
  51 }
  52
  53 #define pmd_populate(mm, pmd, pte_page) \
  54         pmd_populate_kernel(mm, pmd, page_address(pte_page))
  55 #define pmd_populate_kernel(mm, pmd, pte) pmd_set(pmd, (unsigned long)(pte))
  56
  57
  58 #else /* CONFIG_PPC_64K_PAGES */
  59
  60 #define pud_populate(mm, pud, pmd)      pud_set(pud, (unsigned long)pmd)
  61
  62 static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd,
  63                                        pte_t *pte)
  64 {
  65         pmd_set(pmd, (unsigned long)pte);
  66 }
  67
  68 #define pmd_populate(mm, pmd, pte_page) \
  69         pmd_populate_kernel(mm, pmd, page_address(pte_page))
  70
  71 #endif /* CONFIG_PPC_64K_PAGES */
  72
  73 static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long addr)
  74 {
  75         return kmem_cache_alloc(pgtable_cache[PMD_CACHE_NUM],
  76                                 GFP_KERNEL|__GFP_REPEAT);
  77 }
  78
  79 static inline void pmd_free(pmd_t *pmd)
  80 {
  81         kmem_cache_free(pgtable_cache[PMD_CACHE_NUM], pmd);
  82 }
  83
  84 static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
  85                                           unsigned long address)
  86 {
  87         return (pte_t *)__get_free_page(GFP_KERNEL | __GFP_REPEAT | __GFP_ZERO);
  88 }
  89
  90 static inline struct page *pte_alloc_one(struct mm_struct *mm,
  91                                          unsigned long address)
  92 {
  93         pte_t *pte = pte_alloc_one_kernel(mm, address);
  94         return pte ? virt_to_page(pte) : NULL;
  95 }
  96
  97 static inline void pte_free_kernel(pte_t *pte)
  98 {
  99         free_page((unsigned long)pte);
 100 }
 101
 102 static inline void pte_free(struct page *ptepage)
 103 {
 104         __free_page(ptepage);
 105 }
 106
 107 #define PGF_CACHENUM_MASK       0x3
 108
 109 typedef struct pgtable_free {
 110         unsigned long val;
 111 } pgtable_free_t;
 112
 113 static inline pgtable_free_t pgtable_free_cache(void *p, int cachenum,
 114                                                 unsigned long mask)
 115 {
 116         BUG_ON(cachenum > PGF_CACHENUM_MASK);
 117
 118         return (pgtable_free_t){.val = ((unsigned long) p & ~mask) | cachenum};
 119 }
 120
 121 static inline void pgtable_free(pgtable_free_t pgf)
 122 {
 123         void *p = (void *)(pgf.val & ~PGF_CACHENUM_MASK);
 124         int cachenum = pgf.val & PGF_CACHENUM_MASK;
 125
 126         if (cachenum == PTE_NONCACHE_NUM)
 127                 free_page((unsigned long)p);
 128         else
 129                 kmem_cache_free(pgtable_cache[cachenum], p);
 130 }
 131
 132 extern void pgtable_free_tlb(struct mmu_gather *tlb, pgtable_free_t pgf);
 133
 134 #define __pte_free_tlb(tlb, ptepage)    \
 135         pgtable_free_tlb(tlb, pgtable_free_cache(page_address(ptepage), \
 136                 PTE_NONCACHE_NUM, PTE_TABLE_SIZE-1))
 137 #define __pmd_free_tlb(tlb, pmd)        \
 138         pgtable_free_tlb(tlb, pgtable_free_cache(pmd, \
 139                 PMD_CACHE_NUM, PMD_TABLE_SIZE-1))
 140 #ifndef CONFIG_PPC_64K_PAGES
 141 #define __pud_free_tlb(tlb, pud)        \
 142         pgtable_free_tlb(tlb, pgtable_free_cache(pud, \
 143                 PUD_CACHE_NUM, PUD_TABLE_SIZE-1))
 144 #endif /* CONFIG_PPC_64K_PAGES */
 145
 146 #define check_pgt_cache()       do { } while (0)
 147
 148 #endif /* _ASM_POWERPC_PGALLOC_64_H */