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Linux kernel mirror (for testing)
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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 struct ptdesc *ptdesc = page_ptdesc(pte);
79
80 pagetable_pte_dtor(ptdesc);
81 tlb_remove_ptdesc(tlb, ptdesc);
82}
83
84#if CONFIG_PGTABLE_LEVELS > 2
85static inline void __pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmdp,
86 unsigned long addr)
87{
88 struct ptdesc *ptdesc = virt_to_ptdesc(pmdp);
89
90 pagetable_pmd_dtor(ptdesc);
91 tlb_remove_ptdesc(tlb, ptdesc);
92}
93#endif
94
95#if CONFIG_PGTABLE_LEVELS > 3
96static inline void __pud_free_tlb(struct mmu_gather *tlb, pud_t *pudp,
97 unsigned long addr)
98{
99 tlb_remove_ptdesc(tlb, virt_to_ptdesc(pudp));
100}
101#endif
102
103#endif