include/asm-ppc64/pgalloc.h

   1 #ifndef _PPC64_PGALLOC_H
   2 #define _PPC64_PGALLOC_H
   3
   4 #include <linux/mm.h>
   5 #include <linux/slab.h>
   6 #include <linux/cpumask.h>
   7 #include <linux/percpu.h>
   8
   9 extern kmem_cache_t *pgtable_cache[];
  10
  11 #ifdef CONFIG_PPC_64K_PAGES
  12 #define PTE_CACHE_NUM   0
  13 #define PMD_CACHE_NUM   0
  14 #define PGD_CACHE_NUM   1
  15 #else
  16 #define PTE_CACHE_NUM   0
  17 #define PMD_CACHE_NUM   1
  18 #define PUD_CACHE_NUM   1
  19 #define PGD_CACHE_NUM   0
  20 #endif
  21
  22 /*
  23  * This program is free software; you can redistribute it and/or
  24  * modify it under the terms of the GNU General Public License
  25  * as published by the Free Software Foundation; either version
  26  * 2 of the License, or (at your option) any later version.
  27  */
  28
  29 static inline pgd_t *pgd_alloc(struct mm_struct *mm)
  30 {
  31         return kmem_cache_alloc(pgtable_cache[PGD_CACHE_NUM], GFP_KERNEL);
  32 }
  33
  34 static inline void pgd_free(pgd_t *pgd)
  35 {
  36         kmem_cache_free(pgtable_cache[PGD_CACHE_NUM], pgd);
  37 }
  38
  39 #ifndef CONFIG_PPC_64K_PAGES
  40
  41 #define pgd_populate(MM, PGD, PUD)      pgd_set(PGD, PUD)
  42
  43 static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr)
  44 {
  45         return kmem_cache_alloc(pgtable_cache[PUD_CACHE_NUM],
  46                                 GFP_KERNEL|__GFP_REPEAT);
  47 }
  48
  49 static inline void pud_free(pud_t *pud)
  50 {
  51         kmem_cache_free(pgtable_cache[PUD_CACHE_NUM], pud);
  52 }
  53
  54 static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
  55 {
  56         pud_set(pud, (unsigned long)pmd);
  57 }
  58
  59 #define pmd_populate(mm, pmd, pte_page) \
  60         pmd_populate_kernel(mm, pmd, page_address(pte_page))
  61 #define pmd_populate_kernel(mm, pmd, pte) pmd_set(pmd, (unsigned long)(pte))
  62
  63
  64 #else /* CONFIG_PPC_64K_PAGES */
  65
  66 #define pud_populate(mm, pud, pmd)      pud_set(pud, (unsigned long)pmd)
  67
  68 static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd,
  69                                        pte_t *pte)
  70 {
  71         pmd_set(pmd, (unsigned long)pte);
  72 }
  73
  74 #define pmd_populate(mm, pmd, pte_page) \
  75         pmd_populate_kernel(mm, pmd, page_address(pte_page))
  76
  77 #endif /* CONFIG_PPC_64K_PAGES */
  78
  79 static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long addr)
  80 {
  81         return kmem_cache_alloc(pgtable_cache[PMD_CACHE_NUM],
  82                                 GFP_KERNEL|__GFP_REPEAT);
  83 }
  84
  85 static inline void pmd_free(pmd_t *pmd)
  86 {
  87         kmem_cache_free(pgtable_cache[PMD_CACHE_NUM], pmd);
  88 }
  89
  90 static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
  91                                           unsigned long address)
  92 {
  93         return kmem_cache_alloc(pgtable_cache[PTE_CACHE_NUM],
  94                                 GFP_KERNEL|__GFP_REPEAT);
  95 }
  96
  97 static inline struct page *pte_alloc_one(struct mm_struct *mm,
  98                                          unsigned long address)
  99 {
 100         return virt_to_page(pte_alloc_one_kernel(mm, address));
 101 }
 102
 103 static inline void pte_free_kernel(pte_t *pte)
 104 {
 105         kmem_cache_free(pgtable_cache[PTE_CACHE_NUM], pte);
 106 }
 107
 108 static inline void pte_free(struct page *ptepage)
 109 {
 110         pte_free_kernel(page_address(ptepage));
 111 }
 112
 113 #define PGF_CACHENUM_MASK       0xf
 114
 115 typedef struct pgtable_free {
 116         unsigned long val;
 117 } pgtable_free_t;
 118
 119 static inline pgtable_free_t pgtable_free_cache(void *p, int cachenum,
 120                                                 unsigned long mask)
 121 {
 122         BUG_ON(cachenum > PGF_CACHENUM_MASK);
 123
 124         return (pgtable_free_t){.val = ((unsigned long) p & ~mask) | cachenum};
 125 }
 126
 127 static inline void pgtable_free(pgtable_free_t pgf)
 128 {
 129         void *p = (void *)(pgf.val & ~PGF_CACHENUM_MASK);
 130         int cachenum = pgf.val & PGF_CACHENUM_MASK;
 131
 132         kmem_cache_free(pgtable_cache[cachenum], p);
 133 }
 134
 135 extern void pgtable_free_tlb(struct mmu_gather *tlb, pgtable_free_t pgf);
 136
 137 #define __pte_free_tlb(tlb, ptepage)    \
 138         pgtable_free_tlb(tlb, pgtable_free_cache(page_address(ptepage), \
 139                 PTE_CACHE_NUM, PTE_TABLE_SIZE-1))
 140 #define __pmd_free_tlb(tlb, pmd)        \
 141         pgtable_free_tlb(tlb, pgtable_free_cache(pmd, \
 142                 PMD_CACHE_NUM, PMD_TABLE_SIZE-1))
 143 #ifndef CONFIG_PPC_64K_PAGES
 144 #define __pud_free_tlb(tlb, pmd)        \
 145         pgtable_free_tlb(tlb, pgtable_free_cache(pud, \
 146                 PUD_CACHE_NUM, PUD_TABLE_SIZE-1))
 147 #endif /* CONFIG_PPC_64K_PAGES */
 148
 149 #define check_pgt_cache()       do { } while (0)
 150
 151 #endif /* _PPC64_PGALLOC_H */