1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * Based on arch/arm/include/asm/tlb.h
4 *
5 * Copyright (C) 2002 Russell King
6 * Copyright (C) 2012 ARM Ltd.
7 */
8#ifndef __ASM_TLB_H
9#define __ASM_TLB_H
10
11#include <linux/pagemap.h>
12#include <linux/swap.h>
13
14static inline void __tlb_remove_table(void *_table)
15{
16	free_page_and_swap_cache((struct page *)_table);
17}
18
19#define tlb_flush tlb_flush
20static void tlb_flush(struct mmu_gather *tlb);
21
22#include <asm-generic/tlb.h>
23
24/*
25 * get the tlbi levels in arm64.  Default value is 0 if more than one
26 * of cleared_* is set or neither is set.
27 * Arm64 doesn't support p4ds now.
28 */
29static inline int tlb_get_level(struct mmu_gather *tlb)
30{
31	/* The TTL field is only valid for the leaf entry. */
32	if (tlb->freed_tables)
33		return 0;
34
35	if (tlb->cleared_ptes && !(tlb->cleared_pmds ||
36				   tlb->cleared_puds ||
37				   tlb->cleared_p4ds))
38		return 3;
39
40	if (tlb->cleared_pmds && !(tlb->cleared_ptes ||
41				   tlb->cleared_puds ||
42				   tlb->cleared_p4ds))
43		return 2;
44
45	if (tlb->cleared_puds && !(tlb->cleared_ptes ||
46				   tlb->cleared_pmds ||
47				   tlb->cleared_p4ds))
48		return 1;
49
50	return 0;
51}
52
53static inline void tlb_flush(struct mmu_gather *tlb)
54{
55	struct vm_area_struct vma = TLB_FLUSH_VMA(tlb->mm, 0);
56	bool last_level = !tlb->freed_tables;
57	unsigned long stride = tlb_get_unmap_size(tlb);
58	int tlb_level = tlb_get_level(tlb);
59
60	/*
61	 * If we're tearing down the address space then we only care about
62	 * invalidating the walk-cache, since the ASID allocator won't
63	 * reallocate our ASID without invalidating the entire TLB.
64	 */
65	if (tlb->fullmm) {
66		if (!last_level)
67			flush_tlb_mm(tlb->mm);
68		return;
69	}
70
71	__flush_tlb_range(&vma, tlb->start, tlb->end, stride,
72			  last_level, tlb_level);
73}
74
75static inline void __pte_free_tlb(struct mmu_gather *tlb, pgtable_t pte,
76				  unsigned long addr)
77{
78	pgtable_pte_page_dtor(pte);
79	tlb_remove_table(tlb, pte);
80}
81
82#if CONFIG_PGTABLE_LEVELS > 2
83static inline void __pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmdp,
84				  unsigned long addr)
85{
86	struct page *page = virt_to_page(pmdp);
87
88	pgtable_pmd_page_dtor(page);
89	tlb_remove_table(tlb, page);
90}
91#endif
92
93#if CONFIG_PGTABLE_LEVELS > 3
94static inline void __pud_free_tlb(struct mmu_gather *tlb, pud_t *pudp,
95				  unsigned long addr)
96{
97	tlb_remove_table(tlb, virt_to_page(pudp));
98}
99#endif
100
101#endif
102