1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3  *  arch/arm/include/asm/tlb.h
4  *
5  *  Copyright (C) 2002 Russell King
6  *
7  *  Experimentation shows that on a StrongARM, it appears to be faster
8  *  to use the "invalidate whole tlb" rather than "invalidate single
9  *  tlb" for this.
10  *
11  *  This appears true for both the process fork+exit case, as well as
12  *  the munmap-large-area case.
13  */
14 #ifndef __ASMARM_TLB_H
15 #define __ASMARM_TLB_H
16 
17 #include <asm/cacheflush.h>
18 
19 #ifndef CONFIG_MMU
20 
21 #include <linux/pagemap.h>
22 
23 #define tlb_flush(tlb)	((void) tlb)
24 
25 #include <asm-generic/tlb.h>
26 
27 #else /* !CONFIG_MMU */
28 
29 #include <linux/swap.h>
30 #include <asm/tlbflush.h>
31 
__tlb_remove_table(void * _table)32 static inline void __tlb_remove_table(void *_table)
33 {
34 	free_page_and_swap_cache((struct page *)_table);
35 }
36 
37 #include <asm-generic/tlb.h>
38 
39 static inline void
__pte_free_tlb(struct mmu_gather * tlb,pgtable_t pte,unsigned long addr)40 __pte_free_tlb(struct mmu_gather *tlb, pgtable_t pte, unsigned long addr)
41 {
42 	pgtable_pte_page_dtor(pte);
43 
44 #ifndef CONFIG_ARM_LPAE
45 	/*
46 	 * With the classic ARM MMU, a pte page has two corresponding pmd
47 	 * entries, each covering 1MB.
48 	 */
49 	addr = (addr & PMD_MASK) + SZ_1M;
50 	__tlb_adjust_range(tlb, addr - PAGE_SIZE, 2 * PAGE_SIZE);
51 #endif
52 
53 	tlb_remove_table(tlb, pte);
54 }
55 
56 static inline void
__pmd_free_tlb(struct mmu_gather * tlb,pmd_t * pmdp,unsigned long addr)57 __pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmdp, unsigned long addr)
58 {
59 #ifdef CONFIG_ARM_LPAE
60 	struct page *page = virt_to_page(pmdp);
61 
62 	pgtable_pmd_page_dtor(page);
63 	tlb_remove_table(tlb, page);
64 #endif
65 }
66 
67 #endif /* CONFIG_MMU */
68 #endif
69