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   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 #include <linux/config.h>
  17
  18 #include <linux/compiler.h>
  19 #include <linux/mm.h>
  20 #include <linux/page-flags.h>
  21 #include <linux/threads.h>
  22
  23 #include <asm/mmu_context.h>
  24
  25 DECLARE_PER_CPU(unsigned long *, __pgtable_quicklist);
  26 #define pgtable_quicklist __ia64_per_cpu_var(__pgtable_quicklist)
  27 DECLARE_PER_CPU(long, __pgtable_quicklist_size);
  28 #define pgtable_quicklist_size __ia64_per_cpu_var(__pgtable_quicklist_size)
  29
  30 static inline long pgtable_quicklist_total_size(void)
  31 {
  32         long ql_size = 0;
  33         int cpuid;
  34
  35         for_each_online_cpu(cpuid) {
  36                 ql_size += per_cpu(__pgtable_quicklist_size, cpuid);
  37         }
  38         return ql_size;
  39 }
  40
  41 static inline void *pgtable_quicklist_alloc(void)
  42 {
  43         unsigned long *ret = NULL;
  44
  45         preempt_disable();
  46
  47         ret = pgtable_quicklist;
  48         if (likely(ret != NULL)) {
  49                 pgtable_quicklist = (unsigned long *)(*ret);
  50                 ret[0] = 0;
  51                 --pgtable_quicklist_size;
  52                 preempt_enable();
  53         } else {
  54                 preempt_enable();
  55                 ret = (unsigned long *)__get_free_page(GFP_KERNEL | __GFP_ZERO);
  56         }
  57
  58         return ret;
  59 }
  60
  61 static inline void pgtable_quicklist_free(void *pgtable_entry)
  62 {
  63 #ifdef CONFIG_NUMA
  64         unsigned long nid = page_to_nid(virt_to_page(pgtable_entry));
  65
  66         if (unlikely(nid != numa_node_id())) {
  67                 free_page((unsigned long)pgtable_entry);
  68                 return;
  69         }
  70 #endif
  71
  72         preempt_disable();
  73         *(unsigned long *)pgtable_entry = (unsigned long)pgtable_quicklist;
  74         pgtable_quicklist = (unsigned long *)pgtable_entry;
  75         ++pgtable_quicklist_size;
  76         preempt_enable();
  77 }
  78
  79 static inline pgd_t *pgd_alloc(struct mm_struct *mm)
  80 {
  81         return pgtable_quicklist_alloc();
  82 }
  83
  84 static inline void pgd_free(pgd_t * pgd)
  85 {
  86         pgtable_quicklist_free(pgd);
  87 }
  88
  89 static inline void
  90 pud_populate(struct mm_struct *mm, pud_t * pud_entry, pmd_t * pmd)
  91 {
  92         pud_val(*pud_entry) = __pa(pmd);
  93 }
  94
  95 static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long addr)
  96 {
  97         return pgtable_quicklist_alloc();
  98 }
  99
 100 static inline void pmd_free(pmd_t * pmd)
 101 {
 102         pgtable_quicklist_free(pmd);
 103 }
 104
 105 #define __pmd_free_tlb(tlb, pmd)        pmd_free(pmd)
 106
 107 static inline void
 108 pmd_populate(struct mm_struct *mm, pmd_t * pmd_entry, struct page *pte)
 109 {
 110         pmd_val(*pmd_entry) = page_to_phys(pte);
 111 }
 112
 113 static inline void
 114 pmd_populate_kernel(struct mm_struct *mm, pmd_t * pmd_entry, pte_t * pte)
 115 {
 116         pmd_val(*pmd_entry) = __pa(pte);
 117 }
 118
 119 static inline struct page *pte_alloc_one(struct mm_struct *mm,
 120                                          unsigned long addr)
 121 {
 122         return virt_to_page(pgtable_quicklist_alloc());
 123 }
 124
 125 static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
 126                                           unsigned long addr)
 127 {
 128         return pgtable_quicklist_alloc();
 129 }
 130
 131 static inline void pte_free(struct page *pte)
 132 {
 133         pgtable_quicklist_free(page_address(pte));
 134 }
 135
 136 static inline void pte_free_kernel(pte_t * pte)
 137 {
 138         pgtable_quicklist_free(pte);
 139 }
 140
 141 #define __pte_free_tlb(tlb, pte)        pte_free(pte)
 142
 143 extern void check_pgt_cache(void);
 144
 145 #endif                          /* _ASM_IA64_PGALLOC_H */