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
14 static 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
20 static 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 TLBI_TTL_UNKNOWN if more than
26 * one of cleared_* is set or neither is set - this elides the level hinting to
27 * the hardware.
28 */
29 static 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 TLBI_TTL_UNKNOWN;
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 if (tlb->cleared_p4ds && !(tlb->cleared_ptes ||
51 tlb->cleared_pmds ||
52 tlb->cleared_puds))
53 return 0;
54
55 return TLBI_TTL_UNKNOWN;
56 }
57
58 static inline void tlb_flush(struct mmu_gather *tlb)
59 {
60 struct vm_area_struct vma = TLB_FLUSH_VMA(tlb->mm, 0);
61 bool last_level = !tlb->freed_tables;
62 unsigned long stride = tlb_get_unmap_size(tlb);
63 int tlb_level = tlb_get_level(tlb);
64
65 /*
66 * If we're tearing down the address space then we only care about
67 * invalidating the walk-cache, since the ASID allocator won't
68 * reallocate our ASID without invalidating the entire TLB.
69 */
70 if (tlb->fullmm) {
71 if (!last_level)
72 flush_tlb_mm(tlb->mm);
73 return;
74 }
75
76 __flush_tlb_range(&vma, tlb->start, tlb->end, stride,
77 last_level, tlb_level);
78 }
79
80 static inline void __pte_free_tlb(struct mmu_gather *tlb, pgtable_t pte,
81 unsigned long addr)
82 {
83 struct ptdesc *ptdesc = page_ptdesc(pte);
84
85 pagetable_pte_dtor(ptdesc);
86 tlb_remove_ptdesc(tlb, ptdesc);
87 }
88
89 #if CONFIG_PGTABLE_LEVELS > 2
90 static inline void __pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmdp,
91 unsigned long addr)
92 {
93 struct ptdesc *ptdesc = virt_to_ptdesc(pmdp);
94
95 pagetable_pmd_dtor(ptdesc);
96 tlb_remove_ptdesc(tlb, ptdesc);
97 }
98 #endif
99
100 #if CONFIG_PGTABLE_LEVELS > 3
101 static inline void __pud_free_tlb(struct mmu_gather *tlb, pud_t *pudp,
102 unsigned long addr)
103 {
104 struct ptdesc *ptdesc = virt_to_ptdesc(pudp);
105
106 if (!pgtable_l4_enabled())
107 return;
108
109 pagetable_pud_dtor(ptdesc);
110 tlb_remove_ptdesc(tlb, ptdesc);
111 }
112 #endif
113
114 #endif
115
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