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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
736d2169 HD |
2 | /* |
3 | * PARISC64 Huge TLB page support. | |
4 | * | |
5 | * This parisc implementation is heavily based on the SPARC and x86 code. | |
6 | * | |
7 | * Copyright (C) 2015 Helge Deller <deller@gmx.de> | |
8 | */ | |
9 | ||
10 | #include <linux/fs.h> | |
11 | #include <linux/mm.h> | |
01042607 | 12 | #include <linux/sched/mm.h> |
736d2169 HD |
13 | #include <linux/hugetlb.h> |
14 | #include <linux/pagemap.h> | |
15 | #include <linux/sysctl.h> | |
16 | ||
17 | #include <asm/mman.h> | |
18 | #include <asm/pgalloc.h> | |
19 | #include <asm/tlb.h> | |
20 | #include <asm/tlbflush.h> | |
21 | #include <asm/cacheflush.h> | |
22 | #include <asm/mmu_context.h> | |
23 | ||
24 | ||
25 | unsigned long | |
26 | hugetlb_get_unmapped_area(struct file *file, unsigned long addr, | |
27 | unsigned long len, unsigned long pgoff, unsigned long flags) | |
28 | { | |
29 | struct hstate *h = hstate_file(file); | |
30 | ||
31 | if (len & ~huge_page_mask(h)) | |
32 | return -EINVAL; | |
33 | if (len > TASK_SIZE) | |
34 | return -ENOMEM; | |
35 | ||
36 | if (flags & MAP_FIXED) | |
37 | if (prepare_hugepage_range(file, addr, len)) | |
38 | return -EINVAL; | |
39 | ||
40 | if (addr) | |
41 | addr = ALIGN(addr, huge_page_size(h)); | |
42 | ||
43 | /* we need to make sure the colouring is OK */ | |
44 | return arch_get_unmapped_area(file, addr, len, pgoff, flags); | |
45 | } | |
46 | ||
47 | ||
48 | pte_t *huge_pte_alloc(struct mm_struct *mm, | |
49 | unsigned long addr, unsigned long sz) | |
50 | { | |
51 | pgd_t *pgd; | |
52 | pud_t *pud; | |
53 | pmd_t *pmd; | |
54 | pte_t *pte = NULL; | |
55 | ||
56 | /* We must align the address, because our caller will run | |
57 | * set_huge_pte_at() on whatever we return, which writes out | |
58 | * all of the sub-ptes for the hugepage range. So we have | |
59 | * to give it the first such sub-pte. | |
60 | */ | |
61 | addr &= HPAGE_MASK; | |
62 | ||
63 | pgd = pgd_offset(mm, addr); | |
64 | pud = pud_alloc(mm, pgd, addr); | |
65 | if (pud) { | |
66 | pmd = pmd_alloc(mm, pud, addr); | |
67 | if (pmd) | |
3ed3a4f0 | 68 | pte = pte_alloc_map(mm, pmd, addr); |
736d2169 HD |
69 | } |
70 | return pte; | |
71 | } | |
72 | ||
7868a208 PA |
73 | pte_t *huge_pte_offset(struct mm_struct *mm, |
74 | unsigned long addr, unsigned long sz) | |
736d2169 HD |
75 | { |
76 | pgd_t *pgd; | |
77 | pud_t *pud; | |
78 | pmd_t *pmd; | |
79 | pte_t *pte = NULL; | |
80 | ||
81 | addr &= HPAGE_MASK; | |
82 | ||
83 | pgd = pgd_offset(mm, addr); | |
84 | if (!pgd_none(*pgd)) { | |
85 | pud = pud_offset(pgd, addr); | |
86 | if (!pud_none(*pud)) { | |
87 | pmd = pmd_offset(pud, addr); | |
88 | if (!pmd_none(*pmd)) | |
89 | pte = pte_offset_map(pmd, addr); | |
90 | } | |
91 | } | |
92 | return pte; | |
93 | } | |
94 | ||
95 | /* Purge data and instruction TLB entries. Must be called holding | |
96 | * the pa_tlb_lock. The TLB purge instructions are slow on SMP | |
97 | * machines since the purge must be broadcast to all CPUs. | |
98 | */ | |
99 | static inline void purge_tlb_entries_huge(struct mm_struct *mm, unsigned long addr) | |
100 | { | |
101 | int i; | |
102 | ||
103 | /* We may use multiple physical huge pages (e.g. 2x1 MB) to emulate | |
104 | * Linux standard huge pages (e.g. 2 MB) */ | |
105 | BUILD_BUG_ON(REAL_HPAGE_SHIFT > HPAGE_SHIFT); | |
106 | ||
107 | addr &= HPAGE_MASK; | |
108 | addr |= _HUGE_PAGE_SIZE_ENCODING_DEFAULT; | |
109 | ||
110 | for (i = 0; i < (1 << (HPAGE_SHIFT-REAL_HPAGE_SHIFT)); i++) { | |
b0e55131 | 111 | purge_tlb_entries(mm, addr); |
736d2169 HD |
112 | addr += (1UL << REAL_HPAGE_SHIFT); |
113 | } | |
114 | } | |
115 | ||
b0e55131 HD |
116 | /* __set_huge_pte_at() must be called holding the pa_tlb_lock. */ |
117 | static void __set_huge_pte_at(struct mm_struct *mm, unsigned long addr, | |
736d2169 HD |
118 | pte_t *ptep, pte_t entry) |
119 | { | |
120 | unsigned long addr_start; | |
121 | int i; | |
122 | ||
123 | addr &= HPAGE_MASK; | |
124 | addr_start = addr; | |
125 | ||
126 | for (i = 0; i < (1 << HUGETLB_PAGE_ORDER); i++) { | |
b0e55131 | 127 | set_pte(ptep, entry); |
736d2169 HD |
128 | ptep++; |
129 | ||
736d2169 HD |
130 | addr += PAGE_SIZE; |
131 | pte_val(entry) += PAGE_SIZE; | |
132 | } | |
133 | ||
134 | purge_tlb_entries_huge(mm, addr_start); | |
135 | } | |
136 | ||
b0e55131 HD |
137 | void set_huge_pte_at(struct mm_struct *mm, unsigned long addr, |
138 | pte_t *ptep, pte_t entry) | |
139 | { | |
140 | unsigned long flags; | |
141 | ||
142 | purge_tlb_start(flags); | |
143 | __set_huge_pte_at(mm, addr, ptep, entry); | |
144 | purge_tlb_end(flags); | |
145 | } | |
146 | ||
736d2169 HD |
147 | |
148 | pte_t huge_ptep_get_and_clear(struct mm_struct *mm, unsigned long addr, | |
149 | pte_t *ptep) | |
150 | { | |
b0e55131 | 151 | unsigned long flags; |
736d2169 HD |
152 | pte_t entry; |
153 | ||
b0e55131 | 154 | purge_tlb_start(flags); |
736d2169 | 155 | entry = *ptep; |
b0e55131 HD |
156 | __set_huge_pte_at(mm, addr, ptep, __pte(0)); |
157 | purge_tlb_end(flags); | |
736d2169 HD |
158 | |
159 | return entry; | |
160 | } | |
161 | ||
b0e55131 HD |
162 | |
163 | void huge_ptep_set_wrprotect(struct mm_struct *mm, | |
164 | unsigned long addr, pte_t *ptep) | |
165 | { | |
166 | unsigned long flags; | |
167 | pte_t old_pte; | |
168 | ||
169 | purge_tlb_start(flags); | |
170 | old_pte = *ptep; | |
171 | __set_huge_pte_at(mm, addr, ptep, pte_wrprotect(old_pte)); | |
172 | purge_tlb_end(flags); | |
173 | } | |
174 | ||
175 | int huge_ptep_set_access_flags(struct vm_area_struct *vma, | |
176 | unsigned long addr, pte_t *ptep, | |
177 | pte_t pte, int dirty) | |
178 | { | |
179 | unsigned long flags; | |
180 | int changed; | |
181 | ||
182 | purge_tlb_start(flags); | |
183 | changed = !pte_same(*ptep, pte); | |
184 | if (changed) { | |
185 | __set_huge_pte_at(vma->vm_mm, addr, ptep, pte); | |
186 | } | |
187 | purge_tlb_end(flags); | |
188 | return changed; | |
189 | } | |
190 | ||
191 | ||
736d2169 HD |
192 | int pmd_huge(pmd_t pmd) |
193 | { | |
194 | return 0; | |
195 | } | |
196 | ||
197 | int pud_huge(pud_t pud) | |
198 | { | |
199 | return 0; | |
200 | } |