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