include/asm-powerpc/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/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 #ifdef CONFIG_PPC_64K_PAGES
  18 #define PTE_CACHE_NUM   0
  19 #define PMD_CACHE_NUM   1
  20 #define PGD_CACHE_NUM   2
  21 #define HUGEPTE_CACHE_NUM 3
  22 #else
  23 #define PTE_CACHE_NUM   0
  24 #define PMD_CACHE_NUM   1
  25 #define PUD_CACHE_NUM   1
  26 #define PGD_CACHE_NUM   0
  27 #define HUGEPTE_CACHE_NUM 2
  28 #endif
  29
  30 static inline pgd_t *pgd_alloc(struct mm_struct *mm)
  31 {
  32         return kmem_cache_alloc(pgtable_cache[PGD_CACHE_NUM], GFP_KERNEL);
  33 }
  34
  35 static inline void pgd_free(pgd_t *pgd)
  36 {
  37         kmem_cache_free(pgtable_cache[PGD_CACHE_NUM], pgd);
  38 }
  39
  40 #ifndef CONFIG_PPC_64K_PAGES
  41
  42 #define pgd_populate(MM, PGD, PUD)      pgd_set(PGD, PUD)
  43
  44 static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr)
  45 {
  46         return kmem_cache_alloc(pgtable_cache[PUD_CACHE_NUM],
  47                                 GFP_KERNEL|__GFP_REPEAT);
  48 }
  49
  50 static inline void pud_free(pud_t *pud)
  51 {
  52         kmem_cache_free(pgtable_cache[PUD_CACHE_NUM], pud);
  53 }
  54
  55 static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
  56 {
  57         pud_set(pud, (unsigned long)pmd);
  58 }
  59
  60 #define pmd_populate(mm, pmd, pte_page) \
  61         pmd_populate_kernel(mm, pmd, page_address(pte_page))
  62 #define pmd_populate_kernel(mm, pmd, pte) pmd_set(pmd, (unsigned long)(pte))
  63
  64
  65 #else /* CONFIG_PPC_64K_PAGES */
  66
  67 #define pud_populate(mm, pud, pmd)      pud_set(pud, (unsigned long)pmd)
  68
  69 static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd,
  70                                        pte_t *pte)
  71 {
  72         pmd_set(pmd, (unsigned long)pte);
  73 }
  74
  75 #define pmd_populate(mm, pmd, pte_page) \
  76         pmd_populate_kernel(mm, pmd, page_address(pte_page))
  77
  78 #endif /* CONFIG_PPC_64K_PAGES */
  79
  80 static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long addr)
  81 {
  82         return kmem_cache_alloc(pgtable_cache[PMD_CACHE_NUM],
  83                                 GFP_KERNEL|__GFP_REPEAT);
  84 }
  85
  86 static inline void pmd_free(pmd_t *pmd)
  87 {
  88         kmem_cache_free(pgtable_cache[PMD_CACHE_NUM], pmd);
  89 }
  90
  91 static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
  92                                           unsigned long address)
  93 {
  94         return kmem_cache_alloc(pgtable_cache[PTE_CACHE_NUM],
  95                                 GFP_KERNEL|__GFP_REPEAT);
  96 }
  97
  98 static inline struct page *pte_alloc_one(struct mm_struct *mm,
  99                                          unsigned long address)
 100 {
 101         return virt_to_page(pte_alloc_one_kernel(mm, address));
 102 }
 103
 104 static inline void pte_free_kernel(pte_t *pte)
 105 {
 106         kmem_cache_free(pgtable_cache[PTE_CACHE_NUM], pte);
 107 }
 108
 109 static inline void pte_free(struct page *ptepage)
 110 {
 111         pte_free_kernel(page_address(ptepage));
 112 }
 113
 114 #define PGF_CACHENUM_MASK       0x3
 115
 116 typedef struct pgtable_free {
 117         unsigned long val;
 118 } pgtable_free_t;
 119
 120 static inline pgtable_free_t pgtable_free_cache(void *p, int cachenum,
 121                                                 unsigned long mask)
 122 {
 123         BUG_ON(cachenum > PGF_CACHENUM_MASK);
 124
 125         return (pgtable_free_t){.val = ((unsigned long) p & ~mask) | cachenum};
 126 }
 127
 128 static inline void pgtable_free(pgtable_free_t pgf)
 129 {
 130         void *p = (void *)(pgf.val & ~PGF_CACHENUM_MASK);
 131         int cachenum = pgf.val & PGF_CACHENUM_MASK;
 132
 133         kmem_cache_free(pgtable_cache[cachenum], p);
 134 }
 135
 136 extern void pgtable_free_tlb(struct mmu_gather *tlb, pgtable_free_t pgf);
 137
 138 #define __pte_free_tlb(tlb, ptepage)    \
 139         pgtable_free_tlb(tlb, pgtable_free_cache(page_address(ptepage), \
 140                 PTE_CACHE_NUM, PTE_TABLE_SIZE-1))
 141 #define __pmd_free_tlb(tlb, pmd)        \
 142         pgtable_free_tlb(tlb, pgtable_free_cache(pmd, \
 143                 PMD_CACHE_NUM, PMD_TABLE_SIZE-1))
 144 #ifndef CONFIG_PPC_64K_PAGES
 145 #define __pud_free_tlb(tlb, pud)        \
 146         pgtable_free_tlb(tlb, pgtable_free_cache(pud, \
 147                 PUD_CACHE_NUM, PUD_TABLE_SIZE-1))
 148 #endif /* CONFIG_PPC_64K_PAGES */
 149
 150 #define check_pgt_cache()       do { } while (0)
 151
 152 #endif /* _ASM_POWERPC_PGALLOC_64_H */