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1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _ASM_POWERPC_NOHASH_PGALLOC_H
3 #define _ASM_POWERPC_NOHASH_PGALLOC_H
4
5 #include <linux/mm.h>
6 #include <linux/slab.h>
7
8 extern void tlb_remove_table(struct mmu_gather *tlb, void *table);
9 #ifdef CONFIG_PPC64
10 extern void tlb_flush_pgtable(struct mmu_gather *tlb, unsigned long address);
11 #else
12 /* 44x etc which is BOOKE not BOOK3E */
13 static inline void tlb_flush_pgtable(struct mmu_gather *tlb,
14                                      unsigned long address)
15 {
16
17 }
18 #endif /* !CONFIG_PPC_BOOK3E_64 */
19
20 static inline pgd_t *pgd_alloc(struct mm_struct *mm)
21 {
22         pgd_t *pgd = kmem_cache_alloc(PGT_CACHE(PGD_INDEX_SIZE),
23                         pgtable_gfp_flags(mm, GFP_KERNEL));
24
25 #if defined(CONFIG_PPC_8xx) || defined(CONFIG_PPC_BOOK3S_603)
26         memcpy(pgd + USER_PTRS_PER_PGD, swapper_pg_dir + USER_PTRS_PER_PGD,
27                (MAX_PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t));
28 #endif
29         return pgd;
30 }
31
32 static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
33 {
34         kmem_cache_free(PGT_CACHE(PGD_INDEX_SIZE), pgd);
35 }
36
37 #ifdef CONFIG_PPC64
38 #include <asm/nohash/64/pgalloc.h>
39 #else
40 #include <asm/nohash/32/pgalloc.h>
41 #endif
42
43 static inline void pgtable_free(void *table, int shift)
44 {
45         if (!shift) {
46                 pte_fragment_free((unsigned long *)table, 0);
47         } else {
48                 BUG_ON(shift > MAX_PGTABLE_INDEX_SIZE);
49                 kmem_cache_free(PGT_CACHE(shift), table);
50         }
51 }
52
53 static inline void pgtable_free_tlb(struct mmu_gather *tlb, void *table, int shift)
54 {
55         unsigned long pgf = (unsigned long)table;
56
57         BUG_ON(shift > MAX_PGTABLE_INDEX_SIZE);
58         pgf |= shift;
59         tlb_remove_table(tlb, (void *)pgf);
60 }
61
62 static inline void __tlb_remove_table(void *_table)
63 {
64         void *table = (void *)((unsigned long)_table & ~MAX_PGTABLE_INDEX_SIZE);
65         unsigned shift = (unsigned long)_table & MAX_PGTABLE_INDEX_SIZE;
66
67         pgtable_free(table, shift);
68 }
69
70 static inline void __pte_free_tlb(struct mmu_gather *tlb, pgtable_t table,
71                                   unsigned long address)
72 {
73         tlb_flush_pgtable(tlb, address);
74         pgtable_free_tlb(tlb, table, 0);
75 }
76 #endif /* _ASM_POWERPC_NOHASH_PGALLOC_H */
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