arch/ia64/include/asm/tlbflush.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef _ASM_IA64_TLBFLUSH_H
   3 #define _ASM_IA64_TLBFLUSH_H
   4
   5 /*
   6  * Copyright (C) 2002 Hewlett-Packard Co
   7  *      David Mosberger-Tang <davidm@hpl.hp.com>
   8  */
   9
  10
  11 #include <linux/mm.h>
  12
  13 #include <asm/intrinsics.h>
  14 #include <asm/mmu_context.h>
  15 #include <asm/page.h>
  16
  17 /*
  18  * Now for some TLB flushing routines.  This is the kind of stuff that
  19  * can be very expensive, so try to avoid them whenever possible.
  20  */
  21 extern void setup_ptcg_sem(int max_purges, int from_palo);
  22
  23 /*
  24  * Flush everything (kernel mapping may also have changed due to
  25  * vmalloc/vfree).
  26  */
  27 extern void local_flush_tlb_all (void);
  28
  29 #ifdef CONFIG_SMP
  30   extern void smp_flush_tlb_all (void);
  31   extern void smp_flush_tlb_mm (struct mm_struct *mm);
  32   extern void smp_flush_tlb_cpumask (cpumask_t xcpumask);
  33 # define flush_tlb_all()        smp_flush_tlb_all()
  34 #else
  35 # define flush_tlb_all()        local_flush_tlb_all()
  36 # define smp_flush_tlb_cpumask(m) local_flush_tlb_all()
  37 #endif
  38
  39 static inline void
  40 local_finish_flush_tlb_mm (struct mm_struct *mm)
  41 {
  42         if (mm == current->active_mm)
  43                 activate_context(mm);
  44 }
  45
  46 /*
  47  * Flush a specified user mapping.  This is called, e.g., as a result of fork() and
  48  * exit().  fork() ends up here because the copy-on-write mechanism needs to write-protect
  49  * the PTEs of the parent task.
  50  */
  51 static inline void
  52 flush_tlb_mm (struct mm_struct *mm)
  53 {
  54         if (!mm)
  55                 return;
  56
  57         set_bit(mm->context, ia64_ctx.flushmap);
  58         mm->context = 0;
  59
  60         if (atomic_read(&mm->mm_users) == 0)
  61                 return;         /* happens as a result of exit_mmap() */
  62
  63 #ifdef CONFIG_SMP
  64         smp_flush_tlb_mm(mm);
  65 #else
  66         local_finish_flush_tlb_mm(mm);
  67 #endif
  68 }
  69
  70 extern void flush_tlb_range (struct vm_area_struct *vma, unsigned long start, unsigned long end);
  71
  72 /*
  73  * Page-granular tlb flush.
  74  */
  75 static inline void
  76 flush_tlb_page (struct vm_area_struct *vma, unsigned long addr)
  77 {
  78 #ifdef CONFIG_SMP
  79         flush_tlb_range(vma, (addr & PAGE_MASK), (addr & PAGE_MASK) + PAGE_SIZE);
  80 #else
  81         if (vma->vm_mm == current->active_mm)
  82                 ia64_ptcl(addr, (PAGE_SHIFT << 2));
  83         else
  84                 vma->vm_mm->context = 0;
  85 #endif
  86 }
  87
  88 /*
  89  * Flush the local TLB. Invoked from another cpu using an IPI.
  90  */
  91 #ifdef CONFIG_SMP
  92 void smp_local_flush_tlb(void);
  93 #else
  94 #define smp_local_flush_tlb()
  95 #endif
  96
  97 static inline void flush_tlb_kernel_range(unsigned long start,
  98                                           unsigned long end)
  99 {
 100         flush_tlb_all();        /* XXX fix me */
 101 }
 102
 103 #endif /* _ASM_IA64_TLBFLUSH_H */