include/asm-powerpc/pgalloc.h

   1 #ifndef _ASM_POWERPC_PGALLOC_H
   2 #define _ASM_POWERPC_PGALLOC_H
   3 #ifdef __KERNEL__
   4
   5 #ifndef CONFIG_PPC64
   6 #include <asm-ppc/pgalloc.h>
   7 #else
   8
   9 #include <linux/mm.h>
  10 #include <linux/slab.h>
  11 #include <linux/cpumask.h>
  12 #include <linux/percpu.h>
  13
  14 extern kmem_cache_t *pgtable_cache[];
  15
  16 #ifdef CONFIG_PPC_64K_PAGES
  17 #define PTE_CACHE_NUM   0
  18 #define PMD_CACHE_NUM   1
  19 #define PGD_CACHE_NUM   2
  20 #define HUGEPTE_CACHE_NUM 3
  21 #else
  22 #define PTE_CACHE_NUM   0
  23 #define PMD_CACHE_NUM   1
  24 #define PUD_CACHE_NUM   1
  25 #define PGD_CACHE_NUM   0
  26 #define HUGEPTE_CACHE_NUM 2
  27 #endif
  28
  29 /*
  30  * This program is free software; you can redistribute it and/or
  31  * modify it under the terms of the GNU General Public License
  32  * as published by the Free Software Foundation; either version
  33  * 2 of the License, or (at your option) any later version.
  34  */
  35
  36 static inline pgd_t *pgd_alloc(struct mm_struct *mm)
  37 {
  38         return kmem_cache_alloc(pgtable_cache[PGD_CACHE_NUM], GFP_KERNEL);
  39 }
  40
  41 static inline void pgd_free(pgd_t *pgd)
  42 {
  43         kmem_cache_free(pgtable_cache[PGD_CACHE_NUM], pgd);
  44 }
  45
  46 #ifndef CONFIG_PPC_64K_PAGES
  47
  48 #define pgd_populate(MM, PGD, PUD)      pgd_set(PGD, PUD)
  49
  50 static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr)
  51 {
  52         return kmem_cache_alloc(pgtable_cache[PUD_CACHE_NUM],
  53                                 GFP_KERNEL|__GFP_REPEAT);
  54 }
  55
  56 static inline void pud_free(pud_t *pud)
  57 {
  58         kmem_cache_free(pgtable_cache[PUD_CACHE_NUM], pud);
  59 }
  60
  61 static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
  62 {
  63         pud_set(pud, (unsigned long)pmd);
  64 }
  65
  66 #define pmd_populate(mm, pmd, pte_page) \
  67         pmd_populate_kernel(mm, pmd, page_address(pte_page))
  68 #define pmd_populate_kernel(mm, pmd, pte) pmd_set(pmd, (unsigned long)(pte))
  69
  70
  71 #else /* CONFIG_PPC_64K_PAGES */
  72
  73 #define pud_populate(mm, pud, pmd)      pud_set(pud, (unsigned long)pmd)
  74
  75 static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd,
  76                                        pte_t *pte)
  77 {
  78         pmd_set(pmd, (unsigned long)pte);
  79 }
  80
  81 #define pmd_populate(mm, pmd, pte_page) \
  82         pmd_populate_kernel(mm, pmd, page_address(pte_page))
  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(pgtable_cache[PMD_CACHE_NUM],
  89                                 GFP_KERNEL|__GFP_REPEAT);
  90 }
  91
  92 static inline void pmd_free(pmd_t *pmd)
  93 {
  94         kmem_cache_free(pgtable_cache[PMD_CACHE_NUM], pmd);
  95 }
  96
  97 static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
  98                                           unsigned long address)
  99 {
 100         return kmem_cache_alloc(pgtable_cache[PTE_CACHE_NUM],
 101                                 GFP_KERNEL|__GFP_REPEAT);
 102 }
 103
 104 static inline struct page *pte_alloc_one(struct mm_struct *mm,
 105                                          unsigned long address)
 106 {
 107         return virt_to_page(pte_alloc_one_kernel(mm, address));
 108 }
 109
 110 static inline void pte_free_kernel(pte_t *pte)
 111 {
 112         kmem_cache_free(pgtable_cache[PTE_CACHE_NUM], pte);
 113 }
 114
 115 static inline void pte_free(struct page *ptepage)
 116 {
 117         pte_free_kernel(page_address(ptepage));
 118 }
 119
 120 #define PGF_CACHENUM_MASK       0x3
 121
 122 typedef struct pgtable_free {
 123         unsigned long val;
 124 } pgtable_free_t;
 125
 126 static inline pgtable_free_t pgtable_free_cache(void *p, int cachenum,
 127                                                 unsigned long mask)
 128 {
 129         BUG_ON(cachenum > PGF_CACHENUM_MASK);
 130
 131         return (pgtable_free_t){.val = ((unsigned long) p & ~mask) | cachenum};
 132 }
 133
 134 static inline void pgtable_free(pgtable_free_t pgf)
 135 {
 136         void *p = (void *)(pgf.val & ~PGF_CACHENUM_MASK);
 137         int cachenum = pgf.val & PGF_CACHENUM_MASK;
 138
 139         kmem_cache_free(pgtable_cache[cachenum], p);
 140 }
 141
 142 extern void pgtable_free_tlb(struct mmu_gather *tlb, pgtable_free_t pgf);
 143
 144 #define __pte_free_tlb(tlb, ptepage)    \
 145         pgtable_free_tlb(tlb, pgtable_free_cache(page_address(ptepage), \
 146                 PTE_CACHE_NUM, PTE_TABLE_SIZE-1))
 147 #define __pmd_free_tlb(tlb, pmd)        \
 148         pgtable_free_tlb(tlb, pgtable_free_cache(pmd, \
 149                 PMD_CACHE_NUM, PMD_TABLE_SIZE-1))
 150 #ifndef CONFIG_PPC_64K_PAGES
 151 #define __pud_free_tlb(tlb, pud)        \
 152         pgtable_free_tlb(tlb, pgtable_free_cache(pud, \
 153                 PUD_CACHE_NUM, PUD_TABLE_SIZE-1))
 154 #endif /* CONFIG_PPC_64K_PAGES */
 155
 156 #define check_pgt_cache()       do { } while (0)
 157
 158 #endif /* CONFIG_PPC64 */
 159 #endif /* __KERNEL__ */
 160 #endif /* _ASM_POWERPC_PGALLOC_H */