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 #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        3  /* 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(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(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
  62
  63 #else /* CONFIG_PPC_64K_PAGES */
  64
  65 #define pud_populate(mm, pud, pmd)      pud_set(pud, (unsigned long)pmd)
  66
  67 static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd,
  68                                        pte_t *pte)
  69 {
  70         pmd_set(pmd, (unsigned long)pte);
  71 }
  72
  73 #define pmd_populate(mm, pmd, pte_page) \
  74         pmd_populate_kernel(mm, pmd, page_address(pte_page))
  75
  76 #endif /* CONFIG_PPC_64K_PAGES */
  77
  78 static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long addr)
  79 {
  80         return kmem_cache_alloc(pgtable_cache[PMD_CACHE_NUM],
  81                                 GFP_KERNEL|__GFP_REPEAT);
  82 }
  83
  84 static inline void pmd_free(pmd_t *pmd)
  85 {
  86         kmem_cache_free(pgtable_cache[PMD_CACHE_NUM], pmd);
  87 }
  88
  89 static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
  90                                           unsigned long address)
  91 {
  92         return (pte_t *)__get_free_page(GFP_KERNEL | __GFP_REPEAT | __GFP_ZERO);
  93 }
  94
  95 static inline struct page *pte_alloc_one(struct mm_struct *mm,
  96                                          unsigned long address)
  97 {
  98         pte_t *pte = pte_alloc_one_kernel(mm, address);
  99         return pte ? virt_to_page(pte) : NULL;
 100 }
 101
 102 static inline void pte_free_kernel(pte_t *pte)
 103 {
 104         free_page((unsigned long)pte);
 105 }
 106
 107 static inline void pte_free(struct page *ptepage)
 108 {
 109         __free_page(ptepage);
 110 }
 111
 112 #define PGF_CACHENUM_MASK       0x3
 113
 114 typedef struct pgtable_free {
 115         unsigned long val;
 116 } pgtable_free_t;
 117
 118 static inline pgtable_free_t pgtable_free_cache(void *p, int cachenum,
 119                                                 unsigned long mask)
 120 {
 121         BUG_ON(cachenum > PGF_CACHENUM_MASK);
 122
 123         return (pgtable_free_t){.val = ((unsigned long) p & ~mask) | cachenum};
 124 }
 125
 126 static inline void pgtable_free(pgtable_free_t pgf)
 127 {
 128         void *p = (void *)(pgf.val & ~PGF_CACHENUM_MASK);
 129         int cachenum = pgf.val & PGF_CACHENUM_MASK;
 130
 131         if (cachenum == PTE_NONCACHE_NUM)
 132                 free_page((unsigned long)p);
 133         else
 134                 kmem_cache_free(pgtable_cache[cachenum], p);
 135 }
 136
 137 extern void pgtable_free_tlb(struct mmu_gather *tlb, pgtable_free_t pgf);
 138
 139 #define __pte_free_tlb(tlb, ptepage)    \
 140         pgtable_free_tlb(tlb, pgtable_free_cache(page_address(ptepage), \
 141                 PTE_NONCACHE_NUM, PTE_TABLE_SIZE-1))
 142 #define __pmd_free_tlb(tlb, pmd)        \
 143         pgtable_free_tlb(tlb, pgtable_free_cache(pmd, \
 144                 PMD_CACHE_NUM, PMD_TABLE_SIZE-1))
 145 #ifndef CONFIG_PPC_64K_PAGES
 146 #define __pud_free_tlb(tlb, pud)        \
 147         pgtable_free_tlb(tlb, pgtable_free_cache(pud, \
 148                 PUD_CACHE_NUM, PUD_TABLE_SIZE-1))
 149 #endif /* CONFIG_PPC_64K_PAGES */
 150
 151 #define check_pgt_cache()       do { } while (0)
 152
 153 #endif /* _ASM_POWERPC_PGALLOC_64_H */