arch/riscv/mm/tlbflush.c

   1 // SPDX-License-Identifier: GPL-2.0
   2
   3 #include <linux/mm.h>
   4 #include <linux/smp.h>
   5 #include <linux/sched.h>
   6 #include <asm/sbi.h>
   7
   8 void flush_tlb_all(void)
   9 {
  10         sbi_remote_sfence_vma(NULL, 0, -1);
  11 }
  12
  13 /*
  14  * This function must not be called with cmask being null.
  15  * Kernel may panic if cmask is NULL.
  16  */
  17 static void __sbi_tlb_flush_range(struct cpumask *cmask, unsigned long start,
  18                                   unsigned long size)
  19 {
  20         struct cpumask hmask;
  21         unsigned int cpuid;
  22
  23         if (cpumask_empty(cmask))
  24                 return;
  25
  26         cpuid = get_cpu();
  27
  28         if (cpumask_any_but(cmask, cpuid) >= nr_cpu_ids) {
  29                 /* local cpu is the only cpu present in cpumask */
  30                 if (size <= PAGE_SIZE)
  31                         local_flush_tlb_page(start);
  32                 else
  33                         local_flush_tlb_all();
  34         } else {
  35                 riscv_cpuid_to_hartid_mask(cmask, &hmask);
  36                 sbi_remote_sfence_vma(cpumask_bits(&hmask), start, size);
  37         }
  38
  39         put_cpu();
  40 }
  41
  42 void flush_tlb_mm(struct mm_struct *mm)
  43 {
  44         __sbi_tlb_flush_range(mm_cpumask(mm), 0, -1);
  45 }
  46
  47 void flush_tlb_page(struct vm_area_struct *vma, unsigned long addr)
  48 {
  49         __sbi_tlb_flush_range(mm_cpumask(vma->vm_mm), addr, PAGE_SIZE);
  50 }
  51
  52 void flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
  53                      unsigned long end)
  54 {
  55         __sbi_tlb_flush_range(mm_cpumask(vma->vm_mm), start, end - start);
  56 }