Linux kernel mirror (for testing)
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1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef __ASM_GENERIC_PGALLOC_H
3#define __ASM_GENERIC_PGALLOC_H
4
5#ifdef CONFIG_MMU
6
7#define GFP_PGTABLE_KERNEL (GFP_KERNEL | __GFP_ZERO)
8#define GFP_PGTABLE_USER (GFP_PGTABLE_KERNEL | __GFP_ACCOUNT)
9
10/**
11 * __pte_alloc_one_kernel - allocate memory for a PTE-level kernel page table
12 * @mm: the mm_struct of the current context
13 *
14 * This function is intended for architectures that need
15 * anything beyond simple page allocation.
16 *
17 * Return: pointer to the allocated memory or %NULL on error
18 */
19static inline pte_t *__pte_alloc_one_kernel_noprof(struct mm_struct *mm)
20{
21 struct ptdesc *ptdesc = pagetable_alloc_noprof(GFP_PGTABLE_KERNEL &
22 ~__GFP_HIGHMEM, 0);
23
24 if (!ptdesc)
25 return NULL;
26 return ptdesc_address(ptdesc);
27}
28#define __pte_alloc_one_kernel(...) alloc_hooks(__pte_alloc_one_kernel_noprof(__VA_ARGS__))
29
30#ifndef __HAVE_ARCH_PTE_ALLOC_ONE_KERNEL
31/**
32 * pte_alloc_one_kernel - allocate memory for a PTE-level kernel page table
33 * @mm: the mm_struct of the current context
34 *
35 * Return: pointer to the allocated memory or %NULL on error
36 */
37static inline pte_t *pte_alloc_one_kernel_noprof(struct mm_struct *mm)
38{
39 return __pte_alloc_one_kernel_noprof(mm);
40}
41#define pte_alloc_one_kernel(...) alloc_hooks(pte_alloc_one_kernel_noprof(__VA_ARGS__))
42#endif
43
44/**
45 * pte_free_kernel - free PTE-level kernel page table memory
46 * @mm: the mm_struct of the current context
47 * @pte: pointer to the memory containing the page table
48 */
49static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
50{
51 pagetable_free(virt_to_ptdesc(pte));
52}
53
54/**
55 * __pte_alloc_one - allocate memory for a PTE-level user page table
56 * @mm: the mm_struct of the current context
57 * @gfp: GFP flags to use for the allocation
58 *
59 * Allocate memory for a page table and ptdesc and runs pagetable_pte_ctor().
60 *
61 * This function is intended for architectures that need
62 * anything beyond simple page allocation or must have custom GFP flags.
63 *
64 * Return: `struct page` referencing the ptdesc or %NULL on error
65 */
66static inline pgtable_t __pte_alloc_one_noprof(struct mm_struct *mm, gfp_t gfp)
67{
68 struct ptdesc *ptdesc;
69
70 ptdesc = pagetable_alloc_noprof(gfp, 0);
71 if (!ptdesc)
72 return NULL;
73 if (!pagetable_pte_ctor(ptdesc)) {
74 pagetable_free(ptdesc);
75 return NULL;
76 }
77
78 return ptdesc_page(ptdesc);
79}
80#define __pte_alloc_one(...) alloc_hooks(__pte_alloc_one_noprof(__VA_ARGS__))
81
82#ifndef __HAVE_ARCH_PTE_ALLOC_ONE
83/**
84 * pte_alloc_one - allocate a page for PTE-level user page table
85 * @mm: the mm_struct of the current context
86 *
87 * Allocate memory for a page table and ptdesc and runs pagetable_pte_ctor().
88 *
89 * Return: `struct page` referencing the ptdesc or %NULL on error
90 */
91static inline pgtable_t pte_alloc_one_noprof(struct mm_struct *mm)
92{
93 return __pte_alloc_one_noprof(mm, GFP_PGTABLE_USER);
94}
95#define pte_alloc_one(...) alloc_hooks(pte_alloc_one_noprof(__VA_ARGS__))
96#endif
97
98/*
99 * Should really implement gc for free page table pages. This could be
100 * done with a reference count in struct page.
101 */
102
103/**
104 * pte_free - free PTE-level user page table memory
105 * @mm: the mm_struct of the current context
106 * @pte_page: the `struct page` referencing the ptdesc
107 */
108static inline void pte_free(struct mm_struct *mm, struct page *pte_page)
109{
110 struct ptdesc *ptdesc = page_ptdesc(pte_page);
111
112 pagetable_dtor_free(ptdesc);
113}
114
115
116#if CONFIG_PGTABLE_LEVELS > 2
117
118#ifndef __HAVE_ARCH_PMD_ALLOC_ONE
119/**
120 * pmd_alloc_one - allocate memory for a PMD-level page table
121 * @mm: the mm_struct of the current context
122 *
123 * Allocate memory for a page table and ptdesc and runs pagetable_pmd_ctor().
124 *
125 * Allocations use %GFP_PGTABLE_USER in user context and
126 * %GFP_PGTABLE_KERNEL in kernel context.
127 *
128 * Return: pointer to the allocated memory or %NULL on error
129 */
130static inline pmd_t *pmd_alloc_one_noprof(struct mm_struct *mm, unsigned long addr)
131{
132 struct ptdesc *ptdesc;
133 gfp_t gfp = GFP_PGTABLE_USER;
134
135 if (mm == &init_mm)
136 gfp = GFP_PGTABLE_KERNEL;
137 ptdesc = pagetable_alloc_noprof(gfp, 0);
138 if (!ptdesc)
139 return NULL;
140 if (!pagetable_pmd_ctor(ptdesc)) {
141 pagetable_free(ptdesc);
142 return NULL;
143 }
144 return ptdesc_address(ptdesc);
145}
146#define pmd_alloc_one(...) alloc_hooks(pmd_alloc_one_noprof(__VA_ARGS__))
147#endif
148
149#ifndef __HAVE_ARCH_PMD_FREE
150static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
151{
152 struct ptdesc *ptdesc = virt_to_ptdesc(pmd);
153
154 BUG_ON((unsigned long)pmd & (PAGE_SIZE-1));
155 pagetable_dtor_free(ptdesc);
156}
157#endif
158
159#endif /* CONFIG_PGTABLE_LEVELS > 2 */
160
161#if CONFIG_PGTABLE_LEVELS > 3
162
163static inline pud_t *__pud_alloc_one_noprof(struct mm_struct *mm, unsigned long addr)
164{
165 gfp_t gfp = GFP_PGTABLE_USER;
166 struct ptdesc *ptdesc;
167
168 if (mm == &init_mm)
169 gfp = GFP_PGTABLE_KERNEL;
170 gfp &= ~__GFP_HIGHMEM;
171
172 ptdesc = pagetable_alloc_noprof(gfp, 0);
173 if (!ptdesc)
174 return NULL;
175
176 pagetable_pud_ctor(ptdesc);
177 return ptdesc_address(ptdesc);
178}
179#define __pud_alloc_one(...) alloc_hooks(__pud_alloc_one_noprof(__VA_ARGS__))
180
181#ifndef __HAVE_ARCH_PUD_ALLOC_ONE
182/**
183 * pud_alloc_one - allocate memory for a PUD-level page table
184 * @mm: the mm_struct of the current context
185 *
186 * Allocate memory for a page table using %GFP_PGTABLE_USER for user context
187 * and %GFP_PGTABLE_KERNEL for kernel context.
188 *
189 * Return: pointer to the allocated memory or %NULL on error
190 */
191static inline pud_t *pud_alloc_one_noprof(struct mm_struct *mm, unsigned long addr)
192{
193 return __pud_alloc_one_noprof(mm, addr);
194}
195#define pud_alloc_one(...) alloc_hooks(pud_alloc_one_noprof(__VA_ARGS__))
196#endif
197
198static inline void __pud_free(struct mm_struct *mm, pud_t *pud)
199{
200 struct ptdesc *ptdesc = virt_to_ptdesc(pud);
201
202 BUG_ON((unsigned long)pud & (PAGE_SIZE-1));
203 pagetable_dtor_free(ptdesc);
204}
205
206#ifndef __HAVE_ARCH_PUD_FREE
207static inline void pud_free(struct mm_struct *mm, pud_t *pud)
208{
209 __pud_free(mm, pud);
210}
211#endif
212
213#endif /* CONFIG_PGTABLE_LEVELS > 3 */
214
215#if CONFIG_PGTABLE_LEVELS > 4
216
217static inline p4d_t *__p4d_alloc_one_noprof(struct mm_struct *mm, unsigned long addr)
218{
219 gfp_t gfp = GFP_PGTABLE_USER;
220 struct ptdesc *ptdesc;
221
222 if (mm == &init_mm)
223 gfp = GFP_PGTABLE_KERNEL;
224 gfp &= ~__GFP_HIGHMEM;
225
226 ptdesc = pagetable_alloc_noprof(gfp, 0);
227 if (!ptdesc)
228 return NULL;
229
230 pagetable_p4d_ctor(ptdesc);
231 return ptdesc_address(ptdesc);
232}
233#define __p4d_alloc_one(...) alloc_hooks(__p4d_alloc_one_noprof(__VA_ARGS__))
234
235#ifndef __HAVE_ARCH_P4D_ALLOC_ONE
236static inline p4d_t *p4d_alloc_one_noprof(struct mm_struct *mm, unsigned long addr)
237{
238 return __p4d_alloc_one_noprof(mm, addr);
239}
240#define p4d_alloc_one(...) alloc_hooks(p4d_alloc_one_noprof(__VA_ARGS__))
241#endif
242
243static inline void __p4d_free(struct mm_struct *mm, p4d_t *p4d)
244{
245 struct ptdesc *ptdesc = virt_to_ptdesc(p4d);
246
247 BUG_ON((unsigned long)p4d & (PAGE_SIZE-1));
248 pagetable_dtor_free(ptdesc);
249}
250
251#ifndef __HAVE_ARCH_P4D_FREE
252static inline void p4d_free(struct mm_struct *mm, p4d_t *p4d)
253{
254 if (!mm_p4d_folded(mm))
255 __p4d_free(mm, p4d);
256}
257#endif
258
259#endif /* CONFIG_PGTABLE_LEVELS > 4 */
260
261static inline pgd_t *__pgd_alloc_noprof(struct mm_struct *mm, unsigned int order)
262{
263 gfp_t gfp = GFP_PGTABLE_USER;
264 struct ptdesc *ptdesc;
265
266 if (mm == &init_mm)
267 gfp = GFP_PGTABLE_KERNEL;
268 gfp &= ~__GFP_HIGHMEM;
269
270 ptdesc = pagetable_alloc_noprof(gfp, order);
271 if (!ptdesc)
272 return NULL;
273
274 pagetable_pgd_ctor(ptdesc);
275 return ptdesc_address(ptdesc);
276}
277#define __pgd_alloc(...) alloc_hooks(__pgd_alloc_noprof(__VA_ARGS__))
278
279static inline void __pgd_free(struct mm_struct *mm, pgd_t *pgd)
280{
281 struct ptdesc *ptdesc = virt_to_ptdesc(pgd);
282
283 BUG_ON((unsigned long)pgd & (PAGE_SIZE-1));
284 pagetable_dtor_free(ptdesc);
285}
286
287#ifndef __HAVE_ARCH_PGD_FREE
288static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
289{
290 __pgd_free(mm, pgd);
291}
292#endif
293
294#endif /* CONFIG_MMU */
295
296#endif /* __ASM_GENERIC_PGALLOC_H */