1 /* SPDX-License-Identifier: GPL-2.0-or-later */
2 #ifndef _ASM_POWERPC_BOOK3S_64_PGALLOC_H
3 #define _ASM_POWERPC_BOOK3S_64_PGALLOC_H
4 /*
5 */
6
7 #include <linux/slab.h>
8 #include <linux/cpumask.h>
9 #include <linux/kmemleak.h>
10 #include <linux/percpu.h>
11
12 struct vmemmap_backing {
13 struct vmemmap_backing *list;
14 unsigned long phys;
15 unsigned long virt_addr;
16 };
17 extern struct vmemmap_backing *vmemmap_list;
18
19 extern pmd_t *pmd_fragment_alloc(struct mm_struct *, unsigned long);
20 extern void pmd_fragment_free(unsigned long *);
21 extern void pgtable_free_tlb(struct mmu_gather *tlb, void *table, int shift);
22 extern void __tlb_remove_table(void *_table);
23 void pte_frag_destroy(void *pte_frag);
24
25 static inline pgd_t *radix__pgd_alloc(struct mm_struct *mm)
26 {
27 #ifdef CONFIG_PPC_64K_PAGES
28 return (pgd_t *)__get_free_page(pgtable_gfp_flags(mm, PGALLOC_GFP));
29 #else
30 struct page *page;
31 page = alloc_pages(pgtable_gfp_flags(mm, PGALLOC_GFP | __GFP_RETRY_MAYFAIL),
32 4);
33 if (!page)
34 return NULL;
35 return (pgd_t *) page_address(page);
36 #endif
37 }
38
39 static inline void radix__pgd_free(struct mm_struct *mm, pgd_t *pgd)
40 {
41 #ifdef CONFIG_PPC_64K_PAGES
42 free_page((unsigned long)pgd);
43 #else
44 free_pages((unsigned long)pgd, 4);
45 #endif
46 }
47
48 static inline pgd_t *pgd_alloc(struct mm_struct *mm)
49 {
50 pgd_t *pgd;
51
52 if (radix_enabled())
53 return radix__pgd_alloc(mm);
54
55 pgd = kmem_cache_alloc(PGT_CACHE(PGD_INDEX_SIZE),
56 pgtable_gfp_flags(mm, GFP_KERNEL));
57 if (unlikely(!pgd))
58 return pgd;
59
60 /*
61 * Don't scan the PGD for pointers, it contains references to PUDs but
62 * those references are not full pointers and so can't be recognised by
63 * kmemleak.
64 */
65 kmemleak_no_scan(pgd);
66
67 /*
68 * With hugetlb, we don't clear the second half of the page table.
69 * If we share the same slab cache with the pmd or pud level table,
70 * we need to make sure we zero out the full table on alloc.
71 * With 4K we don't store slot in the second half. Hence we don't
72 * need to do this for 4k.
73 */
74 #if defined(CONFIG_HUGETLB_PAGE) && defined(CONFIG_PPC_64K_PAGES) && \
75 (H_PGD_INDEX_SIZE == H_PUD_CACHE_INDEX)
76 memset(pgd, 0, PGD_TABLE_SIZE);
77 #endif
78 return pgd;
79 }
80
81 static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
82 {
83 if (radix_enabled())
84 return radix__pgd_free(mm, pgd);
85 kmem_cache_free(PGT_CACHE(PGD_INDEX_SIZE), pgd);
86 }
87
88 static inline void p4d_populate(struct mm_struct *mm, p4d_t *pgd, pud_t *pud)
89 {
90 *pgd = __p4d(__pgtable_ptr_val(pud) | PGD_VAL_BITS);
91 }
92
93 static inline pud_t *pud_alloc_one(struct mm_struct *mm, unsigned long addr)
94 {
95 pud_t *pud;
96
97 pud = kmem_cache_alloc(PGT_CACHE(PUD_CACHE_INDEX),
98 pgtable_gfp_flags(mm, GFP_KERNEL));
99 /*
100 * Tell kmemleak to ignore the PUD, that means don't scan it for
101 * pointers and don't consider it a leak. PUDs are typically only
102 * referred to by their PGD, but kmemleak is not able to recognise those
103 * as pointers, leading to false leak reports.
104 */
105 kmemleak_ignore(pud);
106
107 return pud;
108 }
109
110 static inline void __pud_free(pud_t *pud)
111 {
112 struct page *page = virt_to_page(pud);
113
114 /*
115 * Early pud pages allocated via memblock allocator
116 * can't be directly freed to slab. KFENCE pages have
117 * both reserved and slab flags set so need to be freed
118 * kmem_cache_free.
119 */
120 if (PageReserved(page) && !PageSlab(page))
121 free_reserved_page(page);
122 else
123 kmem_cache_free(PGT_CACHE(PUD_CACHE_INDEX), pud);
124 }
125
126 static inline void pud_free(struct mm_struct *mm, pud_t *pud)
127 {
128 return __pud_free(pud);
129 }
130
131 static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
132 {
133 *pud = __pud(__pgtable_ptr_val(pmd) | PUD_VAL_BITS);
134 }
135
136 static inline void __pud_free_tlb(struct mmu_gather *tlb, pud_t *pud,
137 unsigned long address)
138 {
139 pgtable_free_tlb(tlb, pud, PUD_INDEX);
140 }
141
142 static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long addr)
143 {
144 return pmd_fragment_alloc(mm, addr);
145 }
146
147 static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
148 {
149 pmd_fragment_free((unsigned long *)pmd);
150 }
151
152 static inline void __pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmd,
153 unsigned long address)
154 {
155 return pgtable_free_tlb(tlb, pmd, PMD_INDEX);
156 }
157
158 static inline void pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmd,
159 pte_t *pte)
160 {
161 *pmd = __pmd(__pgtable_ptr_val(pte) | PMD_VAL_BITS);
162 }
163
164 static inline void pmd_populate(struct mm_struct *mm, pmd_t *pmd,
165 pgtable_t pte_page)
166 {
167 *pmd = __pmd(__pgtable_ptr_val(pte_page) | PMD_VAL_BITS);
168 }
169
170 static inline void __pte_free_tlb(struct mmu_gather *tlb, pgtable_t table,
171 unsigned long address)
172 {
173 pgtable_free_tlb(tlb, table, PTE_INDEX);
174 }
175
176 extern atomic_long_t direct_pages_count[MMU_PAGE_COUNT];
177 static inline void update_page_count(int psize, long count)
178 {
179 if (IS_ENABLED(CONFIG_PROC_FS))
180 atomic_long_add(count, &direct_pages_count[psize]);
181 }
182
183 #endif /* _ASM_POWERPC_BOOK3S_64_PGALLOC_H */
184
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