pgalloc.h

 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
 8extern void tlb_remove_table(struct mmu_gather *tlb, void *table);
 9#ifdef CONFIG_PPC64
10extern void tlb_flush_pgtable(struct mmu_gather *tlb, unsigned long address);
11#else
12/* 44x etc which is BOOKE not BOOK3E */
13static inline void tlb_flush_pgtable(struct mmu_gather *tlb,
14				     unsigned long address)
15{
16
17}
18#endif /* !CONFIG_PPC_BOOK3E_64 */
19
20static 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#ifdef CONFIG_PPC_8xx
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
32static 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
43static 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
53static 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
62static 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
70static 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 */