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1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef __ASM_SH_TLB_H
3#define __ASM_SH_TLB_H
4
5#ifdef CONFIG_SUPERH64
6# include <asm/tlb_64.h>
7#endif
8
9#ifndef __ASSEMBLY__
10#include <linux/pagemap.h>
11
12#ifdef CONFIG_MMU
13#include <linux/swap.h>
14#include <asm/pgalloc.h>
15#include <asm/tlbflush.h>
16#include <asm/mmu_context.h>
17
18/*
19 * TLB handling. This allows us to remove pages from the page
20 * tables, and efficiently handle the TLB issues.
21 */
22struct mmu_gather {
23 struct mm_struct *mm;
24 unsigned int fullmm;
25 unsigned long start, end;
26};
27
28static inline void init_tlb_gather(struct mmu_gather *tlb)
29{
30 tlb->start = TASK_SIZE;
31 tlb->end = 0;
32
33 if (tlb->fullmm) {
34 tlb->start = 0;
35 tlb->end = TASK_SIZE;
36 }
37}
38
39static inline void
40arch_tlb_gather_mmu(struct mmu_gather *tlb, struct mm_struct *mm,
41 unsigned long start, unsigned long end)
42{
43 tlb->mm = mm;
44 tlb->start = start;
45 tlb->end = end;
46 tlb->fullmm = !(start | (end+1));
47
48 init_tlb_gather(tlb);
49}
50
51static inline void
52arch_tlb_finish_mmu(struct mmu_gather *tlb,
53 unsigned long start, unsigned long end, bool force)
54{
55 if (tlb->fullmm || force)
56 flush_tlb_mm(tlb->mm);
57
58 /* keep the page table cache within bounds */
59 check_pgt_cache();
60}
61
62static inline void
63tlb_remove_tlb_entry(struct mmu_gather *tlb, pte_t *ptep, unsigned long address)
64{
65 if (tlb->start > address)
66 tlb->start = address;
67 if (tlb->end < address + PAGE_SIZE)
68 tlb->end = address + PAGE_SIZE;
69}
70
71#define tlb_remove_huge_tlb_entry(h, tlb, ptep, address) \
72 tlb_remove_tlb_entry(tlb, ptep, address)
73
74/*
75 * In the case of tlb vma handling, we can optimise these away in the
76 * case where we're doing a full MM flush. When we're doing a munmap,
77 * the vmas are adjusted to only cover the region to be torn down.
78 */
79static inline void
80tlb_start_vma(struct mmu_gather *tlb, struct vm_area_struct *vma)
81{
82 if (!tlb->fullmm)
83 flush_cache_range(vma, vma->vm_start, vma->vm_end);
84}
85
86static inline void
87tlb_end_vma(struct mmu_gather *tlb, struct vm_area_struct *vma)
88{
89 if (!tlb->fullmm && tlb->end) {
90 flush_tlb_range(vma, tlb->start, tlb->end);
91 init_tlb_gather(tlb);
92 }
93}
94
95static inline void tlb_flush_mmu_tlbonly(struct mmu_gather *tlb)
96{
97}
98
99static inline void tlb_flush_mmu_free(struct mmu_gather *tlb)
100{
101}
102
103static inline void tlb_flush_mmu(struct mmu_gather *tlb)
104{
105}
106
107static inline int __tlb_remove_page(struct mmu_gather *tlb, struct page *page)
108{
109 free_page_and_swap_cache(page);
110 return false; /* avoid calling tlb_flush_mmu */
111}
112
113static inline void tlb_remove_page(struct mmu_gather *tlb, struct page *page)
114{
115 __tlb_remove_page(tlb, page);
116}
117
118static inline bool __tlb_remove_page_size(struct mmu_gather *tlb,
119 struct page *page, int page_size)
120{
121 return __tlb_remove_page(tlb, page);
122}
123
124static inline void tlb_remove_page_size(struct mmu_gather *tlb,
125 struct page *page, int page_size)
126{
127 return tlb_remove_page(tlb, page);
128}
129
130#define tlb_remove_check_page_size_change tlb_remove_check_page_size_change
131static inline void tlb_remove_check_page_size_change(struct mmu_gather *tlb,
132 unsigned int page_size)
133{
134}
135
136#define pte_free_tlb(tlb, ptep, addr) pte_free((tlb)->mm, ptep)
137#define pmd_free_tlb(tlb, pmdp, addr) pmd_free((tlb)->mm, pmdp)
138#define pud_free_tlb(tlb, pudp, addr) pud_free((tlb)->mm, pudp)
139
140#define tlb_migrate_finish(mm) do { } while (0)
141
142#if defined(CONFIG_CPU_SH4) || defined(CONFIG_SUPERH64)
143extern void tlb_wire_entry(struct vm_area_struct *, unsigned long, pte_t);
144extern void tlb_unwire_entry(void);
145#else
146static inline void tlb_wire_entry(struct vm_area_struct *vma ,
147 unsigned long addr, pte_t pte)
148{
149 BUG();
150}
151
152static inline void tlb_unwire_entry(void)
153{
154 BUG();
155}
156#endif
157
158#else /* CONFIG_MMU */
159
160#define tlb_start_vma(tlb, vma) do { } while (0)
161#define tlb_end_vma(tlb, vma) do { } while (0)
162#define __tlb_remove_tlb_entry(tlb, pte, address) do { } while (0)
163#define tlb_flush(tlb) do { } while (0)
164
165#include <asm-generic/tlb.h>
166
167#endif /* CONFIG_MMU */
168#endif /* __ASSEMBLY__ */
169#endif /* __ASM_SH_TLB_H */
1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef __ASM_SH_TLB_H
3#define __ASM_SH_TLB_H
4
5#ifndef __ASSEMBLY__
6#include <linux/pagemap.h>
7#include <asm-generic/tlb.h>
8
9#ifdef CONFIG_MMU
10#include <linux/swap.h>
11
12#if defined(CONFIG_CPU_SH4)
13extern void tlb_wire_entry(struct vm_area_struct *, unsigned long, pte_t);
14extern void tlb_unwire_entry(void);
15#else
16static inline void tlb_wire_entry(struct vm_area_struct *vma ,
17 unsigned long addr, pte_t pte)
18{
19 BUG();
20}
21
22static inline void tlb_unwire_entry(void)
23{
24 BUG();
25}
26#endif /* CONFIG_CPU_SH4 */
27#endif /* CONFIG_MMU */
28#endif /* __ASSEMBLY__ */
29#endif /* __ASM_SH_TLB_H */