1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * Copyright (C) 2012 Regents of the University of California 4 */ 5 6 #ifndef _ASM_RISCV_TLB_H 7 #define _ASM_RISCV_TLB_H 8 9 struct mmu_gather; 10 11 static void tlb_flush(struct mmu_gather *tlb); 12 13 #ifdef CONFIG_MMU 14 #include <linux/swap.h> 15 16 /* 17 * While riscv platforms with riscv_ipi_for_rfence as true require an IPI to 18 * perform TLB shootdown, some platforms with riscv_ipi_for_rfence as false use 19 * SBI to perform TLB shootdown. To keep software pagetable walkers safe in this 20 * case we switch to RCU based table free (MMU_GATHER_RCU_TABLE_FREE). See the 21 * comment below 'ifdef CONFIG_MMU_GATHER_RCU_TABLE_FREE' in include/asm-generic/tlb.h 22 * for more details. 23 */ 24 static inline void __tlb_remove_table(void *table) 25 { 26 free_page_and_swap_cache(table); 27 } 28 29 #endif /* CONFIG_MMU */ 30 31 #define tlb_flush tlb_flush 32 #include <asm-generic/tlb.h> 33 34 static inline void tlb_flush(struct mmu_gather *tlb) 35 { 36 #ifdef CONFIG_MMU 37 if (tlb->fullmm || tlb->need_flush_all || tlb->freed_tables) 38 flush_tlb_mm(tlb->mm); 39 else 40 flush_tlb_mm_range(tlb->mm, tlb->start, tlb->end, 41 tlb_get_unmap_size(tlb)); 42 #endif 43 } 44 45 #endif /* _ASM_RISCV_TLB_H */ 46