Loading...
1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
4 *
5 * vineetg: June 2011
6 * -"/proc/meminfo | grep PageTables" kept on increasing
7 * Recently added pgtable dtor was not getting called.
8 *
9 * vineetg: May 2011
10 * -Variable pg-sz means that Page Tables could be variable sized themselves
11 * So calculate it based on addr traversal split [pgd-bits:pte-bits:xxx]
12 * -Page Table size capped to max 1 to save memory - hence verified.
13 * -Since these deal with constants, gcc compile-time optimizes them.
14 *
15 * vineetg: Nov 2010
16 * -Added pgtable ctor/dtor used for pgtable mem accounting
17 *
18 * vineetg: April 2010
19 * -Switched pgtable_t from being struct page * to unsigned long
20 * =Needed so that Page Table allocator (pte_alloc_one) is not forced to
21 * to deal with struct page. Thay way in future we can make it allocate
22 * multiple PG Tbls in one Page Frame
23 * =sweet side effect is avoiding calls to ugly page_address( ) from the
24 * pg-tlb allocator sub-sys (pte_alloc_one, ptr_free, pmd_populate
25 *
26 * Amit Bhor, Sameer Dhavale: Codito Technologies 2004
27 */
28
29#ifndef _ASM_ARC_PGALLOC_H
30#define _ASM_ARC_PGALLOC_H
31
32#include <linux/mm.h>
33#include <linux/log2.h>
34
35static inline void
36pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd, pte_t *pte)
37{
38 pmd_set(pmd, pte);
39}
40
41static inline void
42pmd_populate(struct mm_struct *mm, pmd_t *pmd, pgtable_t ptep)
43{
44 pmd_set(pmd, (pte_t *) ptep);
45}
46
47static inline int __get_order_pgd(void)
48{
49 return get_order(PTRS_PER_PGD * sizeof(pgd_t));
50}
51
52static inline pgd_t *pgd_alloc(struct mm_struct *mm)
53{
54 int num, num2;
55 pgd_t *ret = (pgd_t *) __get_free_pages(GFP_KERNEL, __get_order_pgd());
56
57 if (ret) {
58 num = USER_PTRS_PER_PGD + USER_KERNEL_GUTTER / PGDIR_SIZE;
59 memzero(ret, num * sizeof(pgd_t));
60
61 num2 = VMALLOC_SIZE / PGDIR_SIZE;
62 memcpy(ret + num, swapper_pg_dir + num, num2 * sizeof(pgd_t));
63
64 memzero(ret + num + num2,
65 (PTRS_PER_PGD - num - num2) * sizeof(pgd_t));
66
67 }
68 return ret;
69}
70
71static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
72{
73 free_pages((unsigned long)pgd, __get_order_pgd());
74}
75
76
77/*
78 * With software-only page-tables, addr-split for traversal is tweakable and
79 * that directly governs how big tables would be at each level.
80 * Further, the MMU page size is configurable.
81 * Thus we need to programatically assert the size constraint
82 * All of this is const math, allowing gcc to do constant folding/propagation.
83 */
84
85static inline int __get_order_pte(void)
86{
87 return get_order(PTRS_PER_PTE * sizeof(pte_t));
88}
89
90static inline pte_t *pte_alloc_one_kernel(struct mm_struct *mm)
91{
92 pte_t *pte;
93
94 pte = (pte_t *) __get_free_pages(GFP_KERNEL | __GFP_ZERO,
95 __get_order_pte());
96
97 return pte;
98}
99
100static inline pgtable_t
101pte_alloc_one(struct mm_struct *mm)
102{
103 pgtable_t pte_pg;
104 struct page *page;
105
106 pte_pg = (pgtable_t)__get_free_pages(GFP_KERNEL, __get_order_pte());
107 if (!pte_pg)
108 return 0;
109 memzero((void *)pte_pg, PTRS_PER_PTE * sizeof(pte_t));
110 page = virt_to_page(pte_pg);
111 if (!pgtable_pte_page_ctor(page)) {
112 __free_page(page);
113 return 0;
114 }
115
116 return pte_pg;
117}
118
119static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
120{
121 free_pages((unsigned long)pte, __get_order_pte()); /* takes phy addr */
122}
123
124static inline void pte_free(struct mm_struct *mm, pgtable_t ptep)
125{
126 pgtable_pte_page_dtor(virt_to_page(ptep));
127 free_pages((unsigned long)ptep, __get_order_pte());
128}
129
130#define __pte_free_tlb(tlb, pte, addr) pte_free((tlb)->mm, pte)
131
132#define pmd_pgtable(pmd) ((pgtable_t) pmd_page_vaddr(pmd))
133
134#endif /* _ASM_ARC_PGALLOC_H */
1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
4 *
5 * vineetg: June 2011
6 * -"/proc/meminfo | grep PageTables" kept on increasing
7 * Recently added pgtable dtor was not getting called.
8 *
9 * vineetg: May 2011
10 * -Variable pg-sz means that Page Tables could be variable sized themselves
11 * So calculate it based on addr traversal split [pgd-bits:pte-bits:xxx]
12 * -Page Table size capped to max 1 to save memory - hence verified.
13 * -Since these deal with constants, gcc compile-time optimizes them.
14 *
15 * vineetg: Nov 2010
16 * -Added pgtable ctor/dtor used for pgtable mem accounting
17 *
18 * vineetg: April 2010
19 * -Switched pgtable_t from being struct page * to unsigned long
20 * =Needed so that Page Table allocator (pte_alloc_one) is not forced to
21 * deal with struct page. That way in future we can make it allocate
22 * multiple PG Tbls in one Page Frame
23 * =sweet side effect is avoiding calls to ugly page_address( ) from the
24 * pg-tlb allocator sub-sys (pte_alloc_one, ptr_free, pmd_populate)
25 *
26 * Amit Bhor, Sameer Dhavale: Codito Technologies 2004
27 */
28
29#ifndef _ASM_ARC_PGALLOC_H
30#define _ASM_ARC_PGALLOC_H
31
32#include <linux/mm.h>
33#include <linux/log2.h>
34#include <asm-generic/pgalloc.h>
35
36static inline void
37pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd, pte_t *pte)
38{
39 /*
40 * The cast to long below is OK in 32-bit PAE40 regime with long long pte
41 * Despite "wider" pte, the pte table needs to be in non-PAE low memory
42 * as all higher levels can only hold long pointers.
43 *
44 * The cast itself is needed given simplistic definition of set_pmd()
45 */
46 set_pmd(pmd, __pmd((unsigned long)pte));
47}
48
49static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd, pgtable_t pte_page)
50{
51 set_pmd(pmd, __pmd((unsigned long)page_address(pte_page)));
52}
53
54static inline pgd_t *pgd_alloc(struct mm_struct *mm)
55{
56 pgd_t *ret = (pgd_t *) __get_free_page(GFP_KERNEL);
57
58 if (ret) {
59 int num, num2;
60 num = USER_PTRS_PER_PGD + USER_KERNEL_GUTTER / PGDIR_SIZE;
61 memzero(ret, num * sizeof(pgd_t));
62
63 num2 = VMALLOC_SIZE / PGDIR_SIZE;
64 memcpy(ret + num, swapper_pg_dir + num, num2 * sizeof(pgd_t));
65
66 memzero(ret + num + num2,
67 (PTRS_PER_PGD - num - num2) * sizeof(pgd_t));
68
69 }
70 return ret;
71}
72
73#if CONFIG_PGTABLE_LEVELS > 3
74
75static inline void p4d_populate(struct mm_struct *mm, p4d_t *p4dp, pud_t *pudp)
76{
77 set_p4d(p4dp, __p4d((unsigned long)pudp));
78}
79
80#define __pud_free_tlb(tlb, pmd, addr) pud_free((tlb)->mm, pmd)
81
82#endif
83
84#if CONFIG_PGTABLE_LEVELS > 2
85
86static inline void pud_populate(struct mm_struct *mm, pud_t *pudp, pmd_t *pmdp)
87{
88 set_pud(pudp, __pud((unsigned long)pmdp));
89}
90
91#define __pmd_free_tlb(tlb, pmd, addr) pmd_free((tlb)->mm, pmd)
92
93#endif
94
95#define __pte_free_tlb(tlb, pte, addr) pte_free((tlb)->mm, pte)
96
97#endif /* _ASM_ARC_PGALLOC_H */