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Linux/arch/arc/include/asm/pgalloc.h

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  1 /*
  2  * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
  3  *
  4  * This program is free software; you can redistribute it and/or modify
  5  * it under the terms of the GNU General Public License version 2 as
  6  * published by the Free Software Foundation.
  7  *
  8  * vineetg: June 2011
  9  *  -"/proc/meminfo | grep PageTables" kept on increasing
 10  *   Recently added pgtable dtor was not getting called.
 11  *
 12  * vineetg: May 2011
 13  *  -Variable pg-sz means that Page Tables could be variable sized themselves
 14  *    So calculate it based on addr traversal split [pgd-bits:pte-bits:xxx]
 15  *  -Page Table size capped to max 1 to save memory - hence verified.
 16  *  -Since these deal with constants, gcc compile-time optimizes them.
 17  *
 18  * vineetg: Nov 2010
 19  *  -Added pgtable ctor/dtor used for pgtable mem accounting
 20  *
 21  * vineetg: April 2010
 22  *  -Switched pgtable_t from being struct page * to unsigned long
 23  *      =Needed so that Page Table allocator (pte_alloc_one) is not forced to
 24  *       to deal with struct page. Thay way in future we can make it allocate
 25  *       multiple PG Tbls in one Page Frame
 26  *      =sweet side effect is avoiding calls to ugly page_address( ) from the
 27  *       pg-tlb allocator sub-sys (pte_alloc_one, ptr_free, pmd_populate
 28  *
 29  *  Amit Bhor, Sameer Dhavale: Codito Technologies 2004
 30  */
 31 
 32 #ifndef _ASM_ARC_PGALLOC_H
 33 #define _ASM_ARC_PGALLOC_H
 34 
 35 #include <linux/mm.h>
 36 #include <linux/log2.h>
 37 
 38 static inline void
 39 pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd, pte_t *pte)
 40 {
 41         pmd_set(pmd, pte);
 42 }
 43 
 44 static inline void
 45 pmd_populate(struct mm_struct *mm, pmd_t *pmd, pgtable_t ptep)
 46 {
 47         pmd_set(pmd, (pte_t *) ptep);
 48 }
 49 
 50 static inline int __get_order_pgd(void)
 51 {
 52         return get_order(PTRS_PER_PGD * 4);
 53 }
 54 
 55 static inline pgd_t *pgd_alloc(struct mm_struct *mm)
 56 {
 57         int num, num2;
 58         pgd_t *ret = (pgd_t *) __get_free_pages(GFP_KERNEL, __get_order_pgd());
 59 
 60         if (ret) {
 61                 num = USER_PTRS_PER_PGD + USER_KERNEL_GUTTER / PGDIR_SIZE;
 62                 memzero(ret, num * sizeof(pgd_t));
 63 
 64                 num2 = VMALLOC_SIZE / PGDIR_SIZE;
 65                 memcpy(ret + num, swapper_pg_dir + num, num2 * sizeof(pgd_t));
 66 
 67                 memzero(ret + num + num2,
 68                                (PTRS_PER_PGD - num - num2) * sizeof(pgd_t));
 69 
 70         }
 71         return ret;
 72 }
 73 
 74 static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
 75 {
 76         free_pages((unsigned long)pgd, __get_order_pgd());
 77 }
 78 
 79 
 80 /*
 81  * With software-only page-tables, addr-split for traversal is tweakable and
 82  * that directly governs how big tables would be at each level.
 83  * Further, the MMU page size is configurable.
 84  * Thus we need to programatically assert the size constraint
 85  * All of this is const math, allowing gcc to do constant folding/propagation.
 86  */
 87 
 88 static inline int __get_order_pte(void)
 89 {
 90         return get_order(PTRS_PER_PTE * 4);
 91 }
 92 
 93 static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm,
 94                                         unsigned long address)
 95 {
 96         pte_t *pte;
 97 
 98         pte = (pte_t *) __get_free_pages(GFP_KERNEL | __GFP_REPEAT | __GFP_ZERO,
 99                                          __get_order_pte());
100 
101         return pte;
102 }
103 
104 static inline pgtable_t
105 pte_alloc_one(struct mm_struct *mm, unsigned long address)
106 {
107         pgtable_t pte_pg;
108         struct page *page;
109 
110         pte_pg = __get_free_pages(GFP_KERNEL | __GFP_REPEAT, __get_order_pte());
111         if (!pte_pg)
112                 return 0;
113         memzero((void *)pte_pg, PTRS_PER_PTE * 4);
114         page = virt_to_page(pte_pg);
115         if (!pgtable_page_ctor(page)) {
116                 __free_page(page);
117                 return 0;
118         }
119 
120         return pte_pg;
121 }
122 
123 static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
124 {
125         free_pages((unsigned long)pte, __get_order_pte()); /* takes phy addr */
126 }
127 
128 static inline void pte_free(struct mm_struct *mm, pgtable_t ptep)
129 {
130         pgtable_page_dtor(virt_to_page(ptep));
131         free_pages(ptep, __get_order_pte());
132 }
133 
134 #define __pte_free_tlb(tlb, pte, addr)  pte_free((tlb)->mm, pte)
135 
136 #define check_pgt_cache()   do { } while (0)
137 #define pmd_pgtable(pmd) pmd_page_vaddr(pmd)
138 
139 #endif /* _ASM_ARC_PGALLOC_H */
140 

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