arch/powerpc/include/asm/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 #ifndef CONFIG_PPC_SUBPAGE_PROT
  16 static inline void subpage_prot_free(pgd_t *pgd) {}
  17 #endif
  18
  19 extern struct kmem_cache *pgtable_cache[];
  20
  21 #define PGD_CACHE_NUM           0
  22 #define PUD_CACHE_NUM           1
  23 #define PMD_CACHE_NUM           1
  24 #define HUGEPTE_CACHE_NUM       2
  25 #define PTE_NONCACHE_NUM        7  /* from GFP rather than kmem_cache */
  26
  27 static inline pgd_t *pgd_alloc(struct mm_struct *mm)
  28 {
  29         return kmem_cache_alloc(pgtable_cache[PGD_CACHE_NUM], GFP_KERNEL);
  30 }
  31
  32 static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
  33 {
  34         subpage_prot_free(pgd);
  35         kmem_cache_free(pgtable_cache[PGD_CACHE_NUM], pgd);
  36 }
  37
  38 #ifndef CONFIG_PPC_64K_PAGES
  39
  40 #define pgd_populate(MM, PGD, PUD)      pgd_set(PGD, PUD)
  41
  42 static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr)
  43 {
  44         return kmem_cache_alloc(pgtable_cache[PUD_CACHE_NUM],
  45                                 GFP_KERNEL|__GFP_REPEAT);
  46 }
  47
  48 static inline void pud_free(struct mm_struct *mm, pud_t *pud)
  49 {
  50         kmem_cache_free(pgtable_cache[PUD_CACHE_NUM], pud);
  51 }
  52
  53 static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
  54 {
  55         pud_set(pud, (unsigned long)pmd);
  56 }
  57
  58 #define pmd_populate(mm, pmd, pte_page) \
  59         pmd_populate_kernel(mm, pmd, page_address(pte_page))
  60 #define pmd_populate_kernel(mm, pmd, pte) pmd_set(pmd, (unsigned long)(pte))
  61 #define pmd_pgtable(pmd) pmd_page(pmd)
  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 #define pmd_pgtable(pmd) pmd_page(pmd)
  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(struct mm_struct *mm, 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 (pte_t *)__get_free_page(GFP_KERNEL | __GFP_REPEAT | __GFP_ZERO);
  95 }
  96
  97 static inline pgtable_t pte_alloc_one(struct mm_struct *mm,
  98                                         unsigned long address)
  99 {
 100         struct page *page;
 101         pte_t *pte;
 102
 103         pte = pte_alloc_one_kernel(mm, address);
 104         if (!pte)
 105                 return NULL;
 106         page = virt_to_page(pte);
 107         pgtable_page_ctor(page);
 108         return page;
 109 }
 110
 111 static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
 112 {
 113         free_page((unsigned long)pte);
 114 }
 115
 116 static inline void pte_free(struct mm_struct *mm, pgtable_t ptepage)
 117 {
 118         pgtable_page_dtor(ptepage);
 119         __free_page(ptepage);
 120 }
 121
 122 #define PGF_CACHENUM_MASK       0x7
 123
 124 typedef struct pgtable_free {
 125         unsigned long val;
 126 } pgtable_free_t;
 127
 128 static inline pgtable_free_t pgtable_free_cache(void *p, int cachenum,
 129                                                 unsigned long mask)
 130 {
 131         BUG_ON(cachenum > PGF_CACHENUM_MASK);
 132
 133         return (pgtable_free_t){.val = ((unsigned long) p & ~mask) | cachenum};
 134 }
 135
 136 static inline void pgtable_free(pgtable_free_t pgf)
 137 {
 138         void *p = (void *)(pgf.val & ~PGF_CACHENUM_MASK);
 139         int cachenum = pgf.val & PGF_CACHENUM_MASK;
 140
 141         if (cachenum == PTE_NONCACHE_NUM)
 142                 free_page((unsigned long)p);
 143         else
 144                 kmem_cache_free(pgtable_cache[cachenum], p);
 145 }
 146
 147 extern void pgtable_free_tlb(struct mmu_gather *tlb, pgtable_free_t pgf);
 148
 149 #define __pte_free_tlb(tlb,ptepage)     \
 150 do { \
 151         pgtable_page_dtor(ptepage); \
 152         pgtable_free_tlb(tlb, pgtable_free_cache(page_address(ptepage), \
 153                 PTE_NONCACHE_NUM, PTE_TABLE_SIZE-1)); \
 154 } while (0)
 155 #define __pmd_free_tlb(tlb, pmd)        \
 156         pgtable_free_tlb(tlb, pgtable_free_cache(pmd, \
 157                 PMD_CACHE_NUM, PMD_TABLE_SIZE-1))
 158 #ifndef CONFIG_PPC_64K_PAGES
 159 #define __pud_free_tlb(tlb, pud)        \
 160         pgtable_free_tlb(tlb, pgtable_free_cache(pud, \
 161                 PUD_CACHE_NUM, PUD_TABLE_SIZE-1))
 162 #endif /* CONFIG_PPC_64K_PAGES */
 163
 164 #define check_pgt_cache()       do { } while (0)
 165
 166 #endif /* _ASM_POWERPC_PGALLOC_64_H */