include/asm-ia64/pgalloc.h

   1 #ifndef _ASM_IA64_PGALLOC_H
   2 #define _ASM_IA64_PGALLOC_H
   3
   4 /*
   5  * This file contains the functions and defines necessary to allocate
   6  * page tables.
   7  *
   8  * This hopefully works with any (fixed) ia-64 page-size, as defined
   9  * in <asm/page.h> (currently 8192).
  10  *
  11  * Copyright (C) 1998-2001 Hewlett-Packard Co
  12  *      David Mosberger-Tang <davidm@hpl.hp.com>
  13  * Copyright (C) 2000, Goutham Rao <goutham.rao@intel.com>
  14  */
  15
  16
  17 #include <linux/compiler.h>
  18 #include <linux/mm.h>
  19 #include <linux/page-flags.h>
  20 #include <linux/threads.h>
  21
  22 #include <asm/mmu_context.h>
  23
  24 DECLARE_PER_CPU(unsigned long *, __pgtable_quicklist);
  25 #define pgtable_quicklist __ia64_per_cpu_var(__pgtable_quicklist)
  26 DECLARE_PER_CPU(long, __pgtable_quicklist_size);
  27 #define pgtable_quicklist_size __ia64_per_cpu_var(__pgtable_quicklist_size)
  28
  29 static inline long pgtable_quicklist_total_size(void)
  30 {
  31         long ql_size = 0;
  32         int cpuid;
  33
  34         for_each_online_cpu(cpuid) {
  35                 ql_size += per_cpu(__pgtable_quicklist_size, cpuid);
  36         }
  37         return ql_size;
  38 }
  39
  40 static inline void *pgtable_quicklist_alloc(void)
  41 {
  42         unsigned long *ret = NULL;
  43
  44         preempt_disable();
  45
  46         ret = pgtable_quicklist;
  47         if (likely(ret != NULL)) {
  48                 pgtable_quicklist = (unsigned long *)(*ret);
  49                 ret[0] = 0;
  50                 --pgtable_quicklist_size;
  51                 preempt_enable();
  52         } else {
  53                 preempt_enable();
  54                 ret = (unsigned long *)__get_free_page(GFP_KERNEL | __GFP_ZERO);
  55         }
  56
  57         return ret;
  58 }
  59
  60 static inline void pgtable_quicklist_free(void *pgtable_entry)
  61 {
  62 #ifdef CONFIG_NUMA
  63         int nid = page_to_nid(virt_to_page(pgtable_entry));
  64
  65         if (unlikely(nid != numa_node_id())) {
  66                 free_page((unsigned long)pgtable_entry);
  67                 return;
  68         }
  69 #endif
  70
  71         preempt_disable();
  72         *(unsigned long *)pgtable_entry = (unsigned long)pgtable_quicklist;
  73         pgtable_quicklist = (unsigned long *)pgtable_entry;
  74         ++pgtable_quicklist_size;
  75         preempt_enable();
  76 }
  77
  78 static inline pgd_t *pgd_alloc(struct mm_struct *mm)
  79 {
  80         return pgtable_quicklist_alloc();
  81 }
  82
  83 static inline void pgd_free(pgd_t * pgd)
  84 {
  85         pgtable_quicklist_free(pgd);
  86 }
  87
  88 #ifdef CONFIG_PGTABLE_4
  89 static inline void
  90 pgd_populate(struct mm_struct *mm, pgd_t * pgd_entry, pud_t * pud)
  91 {
  92         pgd_val(*pgd_entry) = __pa(pud);
  93 }
  94
  95 static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr)
  96 {
  97         return pgtable_quicklist_alloc();
  98 }
  99
 100 static inline void pud_free(pud_t * pud)
 101 {
 102         pgtable_quicklist_free(pud);
 103 }
 104 #define __pud_free_tlb(tlb, pud)        pud_free(pud)
 105 #endif /* CONFIG_PGTABLE_4 */
 106
 107 static inline void
 108 pud_populate(struct mm_struct *mm, pud_t * pud_entry, pmd_t * pmd)
 109 {
 110         pud_val(*pud_entry) = __pa(pmd);
 111 }
 112
 113 static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long addr)
 114 {
 115         return pgtable_quicklist_alloc();
 116 }
 117
 118 static inline void pmd_free(pmd_t * pmd)
 119 {
 120         pgtable_quicklist_free(pmd);
 121 }
 122
 123 #define __pmd_free_tlb(tlb, pmd)        pmd_free(pmd)
 124
 125 static inline void
 126 pmd_populate(struct mm_struct *mm, pmd_t * pmd_entry, struct page *pte)
 127 {
 128         pmd_val(*pmd_entry) = page_to_phys(pte);
 129 }
 130
 131 static inline void
 132 pmd_populate_kernel(struct mm_struct *mm, pmd_t * pmd_entry, pte_t * pte)
 133 {
 134         pmd_val(*pmd_entry) = __pa(pte);
 135 }
 136
 137 static inline struct page *pte_alloc_one(struct mm_struct *mm,
 138                                          unsigned long addr)
 139 {
 140         void *pg = pgtable_quicklist_alloc();
 141         return pg ? virt_to_page(pg) : NULL;
 142 }
 143
 144 static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
 145                                           unsigned long addr)
 146 {
 147         return pgtable_quicklist_alloc();
 148 }
 149
 150 static inline void pte_free(struct page *pte)
 151 {
 152         pgtable_quicklist_free(page_address(pte));
 153 }
 154
 155 static inline void pte_free_kernel(pte_t * pte)
 156 {
 157         pgtable_quicklist_free(pte);
 158 }
 159
 160 #define __pte_free_tlb(tlb, pte)        pte_free(pte)
 161
 162 extern void check_pgt_cache(void);
 163
 164 #endif                          /* _ASM_IA64_PGALLOC_H */