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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
13
14 #define tlb_flush tlb_flush
15 static void tlb_flush(struct mmu_gather *tlb);
16
17 #include <asm-generic/tlb.h>
18
19 /*
20  * get the tlbi levels in arm64.  Default value is TLBI_TTL_UNKNOWN if more than
21  * one of cleared_* is set or neither is set - this elides the level hinting to
22  * the hardware.
23  */
24 static inline int tlb_get_level(struct mmu_gather *tlb)
25 {
26         /* The TTL field is only valid for the leaf entry. */
27         if (tlb->freed_tables)
28                 return TLBI_TTL_UNKNOWN;
29
30         if (tlb->cleared_ptes && !(tlb->cleared_pmds ||
31                                    tlb->cleared_puds ||
32                                    tlb->cleared_p4ds))
33                 return 3;
34
35         if (tlb->cleared_pmds && !(tlb->cleared_ptes ||
36                                    tlb->cleared_puds ||
37                                    tlb->cleared_p4ds))
38                 return 2;
39
40         if (tlb->cleared_puds && !(tlb->cleared_ptes ||
41                                    tlb->cleared_pmds ||
42                                    tlb->cleared_p4ds))
43                 return 1;
44
45         if (tlb->cleared_p4ds && !(tlb->cleared_ptes ||
46                                    tlb->cleared_pmds ||
47                                    tlb->cleared_puds))
48                 return 0;
49
50         return TLBI_TTL_UNKNOWN;
51 }
52
53 static 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
75 static 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         tlb_remove_ptdesc(tlb, ptdesc);
81 }
82
83 #if CONFIG_PGTABLE_LEVELS > 2
84 static inline void __pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmdp,
85                                   unsigned long addr)
86 {
87         struct ptdesc *ptdesc = virt_to_ptdesc(pmdp);
88
89         tlb_remove_ptdesc(tlb, ptdesc);
90 }
91 #endif
92
93 #if CONFIG_PGTABLE_LEVELS > 3
94 static inline void __pud_free_tlb(struct mmu_gather *tlb, pud_t *pudp,
95                                   unsigned long addr)
96 {
97         struct ptdesc *ptdesc = virt_to_ptdesc(pudp);
98
99         if (!pgtable_l4_enabled())
100                 return;
101
102         tlb_remove_ptdesc(tlb, ptdesc);
103 }
104 #endif
105
106 #if CONFIG_PGTABLE_LEVELS > 4
107 static inline void __p4d_free_tlb(struct mmu_gather *tlb, p4d_t *p4dp,
108                                   unsigned long addr)
109 {
110         struct ptdesc *ptdesc = virt_to_ptdesc(p4dp);
111
112         if (!pgtable_l5_enabled())
113                 return;
114
115         tlb_remove_ptdesc(tlb, ptdesc);
116 }
117 #endif
118
119 #endif
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