LXR linux/arch/parisc/include/asm/tlbflush.h

   1/* SPDX-License-Identifier: GPL-2.0 */
   2#ifndef _PARISC_TLBFLUSH_H
   3#define _PARISC_TLBFLUSH_H
   4
   5/* TLB flushing routines.... */
   6
   7#include <linux/mm.h>
   8#include <linux/sched.h>
   9#include <asm/mmu_context.h>
  10
  11extern void flush_tlb_all(void);
  12extern void flush_tlb_all_local(void *);
  13
  14#define smp_flush_tlb_all()     flush_tlb_all()
  15
  16int __flush_tlb_range(unsigned long sid,
  17        unsigned long start, unsigned long end);
  18
  19#define flush_tlb_range(vma, start, end) \
  20        __flush_tlb_range((vma)->vm_mm->context, start, end)
  21
  22#define flush_tlb_kernel_range(start, end) \
  23        __flush_tlb_range(0, start, end)
  24
  25/*
  26 * flush_tlb_mm()
  27 *
  28 * The code to switch to a new context is NOT valid for processes
  29 * which play with the space id's.  Thus, we have to preserve the
  30 * space and just flush the entire tlb.  However, the compilers,
  31 * dynamic linker, etc, do not manipulate space id's, so there
  32 * could be a significant performance benefit in switching contexts
  33 * and not flushing the whole tlb.
  34 */
  35
  36static inline void flush_tlb_mm(struct mm_struct *mm)
  37{
  38        BUG_ON(mm == &init_mm); /* Should never happen */
  39
  40#if 1 || defined(CONFIG_SMP)
  41        /* Except for very small threads, flushing the whole TLB is
  42         * faster than using __flush_tlb_range.  The pdtlb and pitlb
  43         * instructions are very slow because of the TLB broadcast.
  44         * It might be faster to do local range flushes on all CPUs
  45         * on PA 2.0 systems.
  46         */
  47        flush_tlb_all();
  48#else
  49        /* FIXME: currently broken, causing space id and protection ids
  50         * to go out of sync, resulting in faults on userspace accesses.
  51         * This approach needs further investigation since running many
  52         * small applications (e.g., GCC testsuite) is faster on HP-UX.
  53         */
  54        if (mm) {
  55                if (mm->context != 0)
  56                        free_sid(mm->context);
  57                mm->context = alloc_sid();
  58                if (mm == current->active_mm)
  59                        load_context(mm->context);
  60        }
  61#endif
  62}
  63
  64static inline void flush_tlb_page(struct vm_area_struct *vma,
  65        unsigned long addr)
  66{
  67        purge_tlb_entries(vma->vm_mm, addr);
  68}
  69#endif
  70