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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, order: 0);
22
23 if (!ptdesc)
24 return NULL;
25 if (!pagetable_pte_ctor(mm, ptdesc)) {
26 pagetable_free(pt: ptdesc);
27 return NULL;
28 }
29
30 ptdesc_set_kernel(ptdesc);
31
32 return ptdesc_address(pt: ptdesc);
33}
34#define __pte_alloc_one_kernel(...) alloc_hooks(__pte_alloc_one_kernel_noprof(__VA_ARGS__))
35
36#ifndef __HAVE_ARCH_PTE_ALLOC_ONE_KERNEL
37/**
38 * pte_alloc_one_kernel - allocate memory for a PTE-level kernel page table
39 * @mm: the mm_struct of the current context
40 *
41 * Return: pointer to the allocated memory or %NULL on error
42 */
43static inline pte_t *pte_alloc_one_kernel_noprof(struct mm_struct *mm)
44{
45 return __pte_alloc_one_kernel_noprof(mm);
46}
47#define pte_alloc_one_kernel(...) alloc_hooks(pte_alloc_one_kernel_noprof(__VA_ARGS__))
48#endif
49
50/**
51 * pte_free_kernel - free PTE-level kernel page table memory
52 * @mm: the mm_struct of the current context
53 * @pte: pointer to the memory containing the page table
54 */
55static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
56{
57 pagetable_dtor_free(ptdesc: virt_to_ptdesc(x: pte));
58}
59
60/**
61 * __pte_alloc_one - allocate memory for a PTE-level user page table
62 * @mm: the mm_struct of the current context
63 * @gfp: GFP flags to use for the allocation
64 *
65 * Allocate memory for a page table and ptdesc and runs pagetable_pte_ctor().
66 *
67 * This function is intended for architectures that need
68 * anything beyond simple page allocation or must have custom GFP flags.
69 *
70 * Return: `struct page` referencing the ptdesc or %NULL on error
71 */
72static inline pgtable_t __pte_alloc_one_noprof(struct mm_struct *mm, gfp_t gfp)
73{
74 struct ptdesc *ptdesc;
75
76 ptdesc = pagetable_alloc_noprof(gfp, order: 0);
77 if (!ptdesc)
78 return NULL;
79 if (!pagetable_pte_ctor(mm, ptdesc)) {
80 pagetable_free(pt: ptdesc);
81 return NULL;
82 }
83
84 return ptdesc_page(ptdesc);
85}
86#define __pte_alloc_one(...) alloc_hooks(__pte_alloc_one_noprof(__VA_ARGS__))
87
88#ifndef __HAVE_ARCH_PTE_ALLOC_ONE
89/**
90 * pte_alloc_one - allocate a page for PTE-level user page table
91 * @mm: the mm_struct of the current context
92 *
93 * Allocate memory for a page table and ptdesc and runs pagetable_pte_ctor().
94 *
95 * Return: `struct page` referencing the ptdesc or %NULL on error
96 */
97static inline pgtable_t pte_alloc_one_noprof(struct mm_struct *mm)
98{
99 return __pte_alloc_one_noprof(mm, GFP_PGTABLE_USER);
100}
101#define pte_alloc_one(...) alloc_hooks(pte_alloc_one_noprof(__VA_ARGS__))
102#endif
103
104/*
105 * Should really implement gc for free page table pages. This could be
106 * done with a reference count in struct page.
107 */
108
109/**
110 * pte_free - free PTE-level user page table memory
111 * @mm: the mm_struct of the current context
112 * @pte_page: the `struct page` referencing the ptdesc
113 */
114static inline void pte_free(struct mm_struct *mm, struct page *pte_page)
115{
116 struct ptdesc *ptdesc = page_ptdesc(pte_page);
117
118 pagetable_dtor_free(ptdesc);
119}
120
121
122#if CONFIG_PGTABLE_LEVELS > 2
123
124#ifndef __HAVE_ARCH_PMD_ALLOC_ONE
125/**
126 * pmd_alloc_one - allocate memory for a PMD-level page table
127 * @mm: the mm_struct of the current context
128 *
129 * Allocate memory for a page table and ptdesc and runs pagetable_pmd_ctor().
130 *
131 * Allocations use %GFP_PGTABLE_USER in user context and
132 * %GFP_PGTABLE_KERNEL in kernel context.
133 *
134 * Return: pointer to the allocated memory or %NULL on error
135 */
136static inline pmd_t *pmd_alloc_one_noprof(struct mm_struct *mm, unsigned long addr)
137{
138 struct ptdesc *ptdesc;
139 gfp_t gfp = GFP_PGTABLE_USER;
140
141 if (mm == &init_mm)
142 gfp = GFP_PGTABLE_KERNEL;
143 ptdesc = pagetable_alloc_noprof(gfp, order: 0);
144 if (!ptdesc)
145 return NULL;
146 if (!pagetable_pmd_ctor(mm, ptdesc)) {
147 pagetable_free(pt: ptdesc);
148 return NULL;
149 }
150
151 if (mm == &init_mm)
152 ptdesc_set_kernel(ptdesc);
153
154 return ptdesc_address(pt: ptdesc);
155}
156#define pmd_alloc_one(...) alloc_hooks(pmd_alloc_one_noprof(__VA_ARGS__))
157#endif
158
159#ifndef __HAVE_ARCH_PMD_FREE
160static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
161{
162 struct ptdesc *ptdesc = virt_to_ptdesc(x: pmd);
163
164 BUG_ON((unsigned long)pmd & (PAGE_SIZE-1));
165 pagetable_dtor_free(ptdesc);
166}
167#endif
168
169#endif /* CONFIG_PGTABLE_LEVELS > 2 */
170
171#if CONFIG_PGTABLE_LEVELS > 3
172
173static inline pud_t *__pud_alloc_one_noprof(struct mm_struct *mm, unsigned long addr)
174{
175 gfp_t gfp = GFP_PGTABLE_USER;
176 struct ptdesc *ptdesc;
177
178 if (mm == &init_mm)
179 gfp = GFP_PGTABLE_KERNEL;
180
181 ptdesc = pagetable_alloc_noprof(gfp, order: 0);
182 if (!ptdesc)
183 return NULL;
184
185 pagetable_pud_ctor(ptdesc);
186
187 if (mm == &init_mm)
188 ptdesc_set_kernel(ptdesc);
189
190 return ptdesc_address(pt: ptdesc);
191}
192#define __pud_alloc_one(...) alloc_hooks(__pud_alloc_one_noprof(__VA_ARGS__))
193
194#ifndef __HAVE_ARCH_PUD_ALLOC_ONE
195/**
196 * pud_alloc_one - allocate memory for a PUD-level page table
197 * @mm: the mm_struct of the current context
198 *
199 * Allocate memory for a page table using %GFP_PGTABLE_USER for user context
200 * and %GFP_PGTABLE_KERNEL for kernel context.
201 *
202 * Return: pointer to the allocated memory or %NULL on error
203 */
204static inline pud_t *pud_alloc_one_noprof(struct mm_struct *mm, unsigned long addr)
205{
206 return __pud_alloc_one_noprof(mm, addr);
207}
208#define pud_alloc_one(...) alloc_hooks(pud_alloc_one_noprof(__VA_ARGS__))
209#endif
210
211static inline void __pud_free(struct mm_struct *mm, pud_t *pud)
212{
213 struct ptdesc *ptdesc = virt_to_ptdesc(x: pud);
214
215 BUG_ON((unsigned long)pud & (PAGE_SIZE-1));
216 pagetable_dtor_free(ptdesc);
217}
218
219#ifndef __HAVE_ARCH_PUD_FREE
220static inline void pud_free(struct mm_struct *mm, pud_t *pud)
221{
222 __pud_free(mm, pud);
223}
224#endif
225
226#endif /* CONFIG_PGTABLE_LEVELS > 3 */
227
228#if CONFIG_PGTABLE_LEVELS > 4
229
230static inline p4d_t *__p4d_alloc_one_noprof(struct mm_struct *mm, unsigned long addr)
231{
232 gfp_t gfp = GFP_PGTABLE_USER;
233 struct ptdesc *ptdesc;
234
235 if (mm == &init_mm)
236 gfp = GFP_PGTABLE_KERNEL;
237
238 ptdesc = pagetable_alloc_noprof(gfp, order: 0);
239 if (!ptdesc)
240 return NULL;
241
242 pagetable_p4d_ctor(ptdesc);
243
244 if (mm == &init_mm)
245 ptdesc_set_kernel(ptdesc);
246
247 return ptdesc_address(pt: ptdesc);
248}
249#define __p4d_alloc_one(...) alloc_hooks(__p4d_alloc_one_noprof(__VA_ARGS__))
250
251#ifndef __HAVE_ARCH_P4D_ALLOC_ONE
252static inline p4d_t *p4d_alloc_one_noprof(struct mm_struct *mm, unsigned long addr)
253{
254 return __p4d_alloc_one_noprof(mm, addr);
255}
256#define p4d_alloc_one(...) alloc_hooks(p4d_alloc_one_noprof(__VA_ARGS__))
257#endif
258
259static inline void __p4d_free(struct mm_struct *mm, p4d_t *p4d)
260{
261 struct ptdesc *ptdesc = virt_to_ptdesc(x: p4d);
262
263 BUG_ON((unsigned long)p4d & (PAGE_SIZE-1));
264 pagetable_dtor_free(ptdesc);
265}
266
267#ifndef __HAVE_ARCH_P4D_FREE
268static inline void p4d_free(struct mm_struct *mm, p4d_t *p4d)
269{
270 if (!mm_p4d_folded(mm))
271 __p4d_free(mm, p4d);
272}
273#endif
274
275#endif /* CONFIG_PGTABLE_LEVELS > 4 */
276
277static inline pgd_t *__pgd_alloc_noprof(struct mm_struct *mm, unsigned int order)
278{
279 gfp_t gfp = GFP_PGTABLE_USER;
280 struct ptdesc *ptdesc;
281
282 if (mm == &init_mm)
283 gfp = GFP_PGTABLE_KERNEL;
284
285 ptdesc = pagetable_alloc_noprof(gfp, order);
286 if (!ptdesc)
287 return NULL;
288
289 pagetable_pgd_ctor(ptdesc);
290
291 if (mm == &init_mm)
292 ptdesc_set_kernel(ptdesc);
293
294 return ptdesc_address(pt: ptdesc);
295}
296#define __pgd_alloc(...) alloc_hooks(__pgd_alloc_noprof(__VA_ARGS__))
297
298static inline void __pgd_free(struct mm_struct *mm, pgd_t *pgd)
299{
300 struct ptdesc *ptdesc = virt_to_ptdesc(x: pgd);
301
302 BUG_ON((unsigned long)pgd & (PAGE_SIZE-1));
303 pagetable_dtor_free(ptdesc);
304}
305
306#ifndef __HAVE_ARCH_PGD_FREE
307static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
308{
309 __pgd_free(mm, pgd);
310}
311#endif
312
313#endif /* CONFIG_MMU */
314
315#endif /* __ASM_GENERIC_PGALLOC_H */
316

source code of linux/include/asm-generic/pgalloc.h