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 if (tlb->cleared_ptes && !(tlb->cleared_pmds ||
32 tlb->cleared_puds ||
33 tlb->cleared_p4ds))
34 return 3;
35
36 if (tlb->cleared_pmds && !(tlb->cleared_ptes ||
37 tlb->cleared_puds ||
38 tlb->cleared_p4ds))
39 return 2;
40
41 if (tlb->cleared_puds && !(tlb->cleared_ptes ||
42 tlb->cleared_pmds ||
43 tlb->cleared_p4ds))
44 return 1;
45
46 return 0;
47 }
48
tlb_flush(struct mmu_gather * tlb)49 static inline void tlb_flush(struct mmu_gather *tlb)
50 {
51 struct vm_area_struct vma = TLB_FLUSH_VMA(tlb->mm, 0);
52 bool last_level = !tlb->freed_tables;
53 unsigned long stride = tlb_get_unmap_size(tlb);
54 int tlb_level = tlb_get_level(tlb);
55
56 /*
57 * If we're tearing down the address space then we only care about
58 * invalidating the walk-cache, since the ASID allocator won't
59 * reallocate our ASID without invalidating the entire TLB.
60 */
61 if (tlb->fullmm) {
62 if (!last_level)
63 flush_tlb_mm(tlb->mm);
64 return;
65 }
66
67 __flush_tlb_range(&vma, tlb->start, tlb->end, stride,
68 last_level, tlb_level);
69 }
70
__pte_free_tlb(struct mmu_gather * tlb,pgtable_t pte,unsigned long addr)71 static inline void __pte_free_tlb(struct mmu_gather *tlb, pgtable_t pte,
72 unsigned long addr)
73 {
74 pgtable_pte_page_dtor(pte);
75 tlb_remove_table(tlb, pte);
76 }
77
78 #if CONFIG_PGTABLE_LEVELS > 2
__pmd_free_tlb(struct mmu_gather * tlb,pmd_t * pmdp,unsigned long addr)79 static inline void __pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmdp,
80 unsigned long addr)
81 {
82 struct page *page = virt_to_page(pmdp);
83
84 pgtable_pmd_page_dtor(page);
85 tlb_remove_table(tlb, page);
86 }
87 #endif
88
89 #if CONFIG_PGTABLE_LEVELS > 3
__pud_free_tlb(struct mmu_gather * tlb,pud_t * pudp,unsigned long addr)90 static inline void __pud_free_tlb(struct mmu_gather *tlb, pud_t *pudp,
91 unsigned long addr)
92 {
93 tlb_remove_table(tlb, virt_to_page(pudp));
94 }
95 #endif
96
97 #endif
98