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 #else
  21 #define PTE_CACHE_NUM   0
  22 #define PMD_CACHE_NUM   1
  23 #define PUD_CACHE_NUM   1
  24 #define PGD_CACHE_NUM   0
  25 #endif
  26
  27 /*
  28  * This program is free software; you can redistribute it and/or
  29  * modify it under the terms of the GNU General Public License
  30  * as published by the Free Software Foundation; either version
  31  * 2 of the License, or (at your option) any later version.
  32  */
  33
  34 static inline pgd_t *pgd_alloc(struct mm_struct *mm)
  35 {
  36         return kmem_cache_alloc(pgtable_cache[PGD_CACHE_NUM], GFP_KERNEL);
  37 }
  38
  39 static inline void pgd_free(pgd_t *pgd)
  40 {
  41         kmem_cache_free(pgtable_cache[PGD_CACHE_NUM], 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(pgtable_cache[PUD_CACHE_NUM],
  51                                 GFP_KERNEL|__GFP_REPEAT);
  52 }
  53
  54 static inline void pud_free(pud_t *pud)
  55 {
  56         kmem_cache_free(pgtable_cache[PUD_CACHE_NUM], 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
  68
  69 #else /* CONFIG_PPC_64K_PAGES */
  70
  71 #define pud_populate(mm, pud, pmd)      pud_set(pud, (unsigned long)pmd)
  72
  73 static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd,
  74                                        pte_t *pte)
  75 {
  76         pmd_set(pmd, (unsigned long)pte);
  77 }
  78
  79 #define pmd_populate(mm, pmd, pte_page) \
  80         pmd_populate_kernel(mm, pmd, page_address(pte_page))
  81
  82 #endif /* CONFIG_PPC_64K_PAGES */
  83
  84 static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long addr)
  85 {
  86         return kmem_cache_alloc(pgtable_cache[PMD_CACHE_NUM],
  87                                 GFP_KERNEL|__GFP_REPEAT);
  88 }
  89
  90 static inline void pmd_free(pmd_t *pmd)
  91 {
  92         kmem_cache_free(pgtable_cache[PMD_CACHE_NUM], pmd);
  93 }
  94
  95 static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
  96                                           unsigned long address)
  97 {
  98         return kmem_cache_alloc(pgtable_cache[PTE_CACHE_NUM],
  99                                 GFP_KERNEL|__GFP_REPEAT);
 100 }
 101
 102 static inline struct page *pte_alloc_one(struct mm_struct *mm,
 103                                          unsigned long address)
 104 {
 105         return virt_to_page(pte_alloc_one_kernel(mm, address));
 106 }
 107
 108 static inline void pte_free_kernel(pte_t *pte)
 109 {
 110         kmem_cache_free(pgtable_cache[PTE_CACHE_NUM], pte);
 111 }
 112
 113 static inline void pte_free(struct page *ptepage)
 114 {
 115         pte_free_kernel(page_address(ptepage));
 116 }
 117
 118 #define PGF_CACHENUM_MASK       0xf
 119
 120 typedef struct pgtable_free {
 121         unsigned long val;
 122 } pgtable_free_t;
 123
 124 static inline pgtable_free_t pgtable_free_cache(void *p, int cachenum,
 125                                                 unsigned long mask)
 126 {
 127         BUG_ON(cachenum > PGF_CACHENUM_MASK);
 128
 129         return (pgtable_free_t){.val = ((unsigned long) p & ~mask) | cachenum};
 130 }
 131
 132 static inline void pgtable_free(pgtable_free_t pgf)
 133 {
 134         void *p = (void *)(pgf.val & ~PGF_CACHENUM_MASK);
 135         int cachenum = pgf.val & PGF_CACHENUM_MASK;
 136
 137         kmem_cache_free(pgtable_cache[cachenum], p);
 138 }
 139
 140 extern void pgtable_free_tlb(struct mmu_gather *tlb, pgtable_free_t pgf);
 141
 142 #define __pte_free_tlb(tlb, ptepage)    \
 143         pgtable_free_tlb(tlb, pgtable_free_cache(page_address(ptepage), \
 144                 PTE_CACHE_NUM, PTE_TABLE_SIZE-1))
 145 #define __pmd_free_tlb(tlb, pmd)        \
 146         pgtable_free_tlb(tlb, pgtable_free_cache(pmd, \
 147                 PMD_CACHE_NUM, PMD_TABLE_SIZE-1))
 148 #ifndef CONFIG_PPC_64K_PAGES
 149 #define __pud_free_tlb(tlb, pmd)        \
 150         pgtable_free_tlb(tlb, pgtable_free_cache(pud, \
 151                 PUD_CACHE_NUM, PUD_TABLE_SIZE-1))
 152 #endif /* CONFIG_PPC_64K_PAGES */
 153
 154 #define check_pgt_cache()       do { } while (0)
 155
 156 #endif /* CONFIG_PPC64 */
 157 #endif /* __KERNEL__ */
 158 #endif /* _ASM_POWERPC_PGALLOC_H */