tlb.h

 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 <asm/tlbflush.h>
30#include <asm-generic/tlb.h>
31
32static inline void
33__pte_free_tlb(struct mmu_gather *tlb, pgtable_t pte, unsigned long addr)
34{
35	struct ptdesc *ptdesc = page_ptdesc(pte);
36
37#ifndef CONFIG_ARM_LPAE
38	/*
39	 * With the classic ARM MMU, a pte page has two corresponding pmd
40	 * entries, each covering 1MB.
41	 */
42	addr = (addr & PMD_MASK) + SZ_1M;
43	__tlb_adjust_range(tlb, addr - PAGE_SIZE, 2 * PAGE_SIZE);
44#endif
45
46	tlb_remove_ptdesc(tlb, ptdesc);
47}
48
49static inline void
50__pmd_free_tlb(struct mmu_gather *tlb, pmd_t *pmdp, unsigned long addr)
51{
52#ifdef CONFIG_ARM_LPAE
53	struct ptdesc *ptdesc = virt_to_ptdesc(pmdp);
54
55	tlb_remove_ptdesc(tlb, ptdesc);
56#endif
57}
58
59#endif /* CONFIG_MMU */
60#endif