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
__tlb_remove_table(void * _table)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 0 if more than one
26 * of cleared_* is set or neither is set.
27 * Arm64 doesn't support p4ds now.
28 */
tlb_get_level(struct mmu_gather * tlb)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 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
tlb_flush(struct mmu_gather * tlb)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
__pte_free_tlb(struct mmu_gather * tlb,pgtable_t pte,unsigned long addr)75 static 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
__pmd_free_tlb(struct mmu_gather * tlb,pmd_t * pmdp,unsigned long addr)83 static 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
__pud_free_tlb(struct mmu_gather * tlb,pud_t * pudp,unsigned long addr)94 static 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