LXR linux/arch/powerpc/include/asm/tlb.h

   1/* SPDX-License-Identifier: GPL-2.0-or-later */
   2/*
   3 *      TLB shootdown specifics for powerpc
   4 *
   5 * Copyright (C) 2002 Anton Blanchard, IBM Corp.
   6 * Copyright (C) 2002 Paul Mackerras, IBM Corp.
   7 */
   8#ifndef _ASM_POWERPC_TLB_H
   9#define _ASM_POWERPC_TLB_H
  10#ifdef __KERNEL__
  11
  12#ifndef __powerpc64__
  13#include <asm/pgtable.h>
  14#endif
  15#include <asm/pgalloc.h>
  16#ifndef __powerpc64__
  17#include <asm/page.h>
  18#include <asm/mmu.h>
  19#endif
  20
  21#include <linux/pagemap.h>
  22
  23#define tlb_start_vma(tlb, vma) do { } while (0)
  24#define tlb_end_vma(tlb, vma)   do { } while (0)
  25#define __tlb_remove_tlb_entry  __tlb_remove_tlb_entry
  26
  27#define tlb_flush tlb_flush
  28extern void tlb_flush(struct mmu_gather *tlb);
  29
  30/* Get the generic bits... */
  31#include <asm-generic/tlb.h>
  32
  33extern void flush_hash_entry(struct mm_struct *mm, pte_t *ptep,
  34                             unsigned long address);
  35
  36static inline void __tlb_remove_tlb_entry(struct mmu_gather *tlb, pte_t *ptep,
  37                                          unsigned long address)
  38{
  39#ifdef CONFIG_PPC_BOOK3S_32
  40        if (pte_val(*ptep) & _PAGE_HASHPTE)
  41                flush_hash_entry(tlb->mm, ptep, address);
  42#endif
  43}
  44
  45#ifdef CONFIG_SMP
  46static inline int mm_is_core_local(struct mm_struct *mm)
  47{
  48        return cpumask_subset(mm_cpumask(mm),
  49                              topology_sibling_cpumask(smp_processor_id()));
  50}
  51
  52#ifdef CONFIG_PPC_BOOK3S_64
  53static inline int mm_is_thread_local(struct mm_struct *mm)
  54{
  55        if (atomic_read(&mm->context.active_cpus) > 1)
  56                return false;
  57        return cpumask_test_cpu(smp_processor_id(), mm_cpumask(mm));
  58}
  59static inline void mm_reset_thread_local(struct mm_struct *mm)
  60{
  61        WARN_ON(atomic_read(&mm->context.copros) > 0);
  62        /*
  63         * It's possible for mm_access to take a reference on mm_users to
  64         * access the remote mm from another thread, but it's not allowed
  65         * to set mm_cpumask, so mm_users may be > 1 here.
  66         */
  67        WARN_ON(current->mm != mm);
  68        atomic_set(&mm->context.active_cpus, 1);
  69        cpumask_clear(mm_cpumask(mm));
  70        cpumask_set_cpu(smp_processor_id(), mm_cpumask(mm));
  71}
  72#else /* CONFIG_PPC_BOOK3S_64 */
  73static inline int mm_is_thread_local(struct mm_struct *mm)
  74{
  75        return cpumask_equal(mm_cpumask(mm),
  76                              cpumask_of(smp_processor_id()));
  77}
  78#endif /* !CONFIG_PPC_BOOK3S_64 */
  79
  80#else /* CONFIG_SMP */
  81static inline int mm_is_core_local(struct mm_struct *mm)
  82{
  83        return 1;
  84}
  85
  86static inline int mm_is_thread_local(struct mm_struct *mm)
  87{
  88        return 1;
  89}
  90#endif
  91
  92#endif /* __KERNEL__ */
  93#endif /* __ASM_POWERPC_TLB_H */
  94