arch/riscv/include/asm/tlb.h

   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 */