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 32 static 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 49 static 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 61