alistair23-linux/arch/powerpc/include/asm/tlb.h

/* SPDX-License-Identifier: GPL-2.0-or-later */
/*
 *	TLB shootdown specifics for powerpc
 *
 * Copyright (C) 2002 Anton Blanchard, IBM Corp.
 * Copyright (C) 2002 Paul Mackerras, IBM Corp.
 */
#ifndef _ASM_POWERPC_TLB_H
#define _ASM_POWERPC_TLB_H
#ifdef __KERNEL__

#ifndef __powerpc64__
#include <asm/pgtable.h>
#endif
#include <asm/pgalloc.h>
#ifndef __powerpc64__
#include <asm/page.h>
#include <asm/mmu.h>
#endif

#include <linux/pagemap.h>

#define tlb_start_vma(tlb, vma)	do { } while (0)
#define tlb_end_vma(tlb, vma)	do { } while (0)
#define __tlb_remove_tlb_entry	__tlb_remove_tlb_entry

#define tlb_flush tlb_flush
extern void tlb_flush(struct mmu_gather *tlb);

/* Get the generic bits... */
#include <asm-generic/tlb.h>

extern void flush_hash_entry(struct mm_struct *mm, pte_t *ptep,
			     unsigned long address);

static inline void __tlb_remove_tlb_entry(struct mmu_gather *tlb, pte_t *ptep,
					  unsigned long address)
{
#ifdef CONFIG_PPC_BOOK3S_32
	if (pte_val(*ptep) & _PAGE_HASHPTE)
		flush_hash_entry(tlb->mm, ptep, address);
#endif
}

#ifdef CONFIG_SMP
static inline int mm_is_core_local(struct mm_struct *mm)
{
	return cpumask_subset(mm_cpumask(mm),
			      topology_sibling_cpumask(smp_processor_id()));
}

#ifdef CONFIG_PPC_BOOK3S_64
static inline int mm_is_thread_local(struct mm_struct *mm)
{
	if (atomic_read(&mm->context.active_cpus) > 1)
		return false;
	return cpumask_test_cpu(smp_processor_id(), mm_cpumask(mm));
}
static inline void mm_reset_thread_local(struct mm_struct *mm)
{
	WARN_ON(atomic_read(&mm->context.copros) > 0);
	/*
	 * It's possible for mm_access to take a reference on mm_users to
	 * access the remote mm from another thread, but it's not allowed
	 * to set mm_cpumask, so mm_users may be > 1 here.
	 */
	WARN_ON(current->mm != mm);
	atomic_set(&mm->context.active_cpus, 1);
	cpumask_clear(mm_cpumask(mm));
	cpumask_set_cpu(smp_processor_id(), mm_cpumask(mm));
}
#else /* CONFIG_PPC_BOOK3S_64 */
static inline int mm_is_thread_local(struct mm_struct *mm)
{
	return cpumask_equal(mm_cpumask(mm),
			      cpumask_of(smp_processor_id()));
}
#endif /* !CONFIG_PPC_BOOK3S_64 */

#else /* CONFIG_SMP */
static inline int mm_is_core_local(struct mm_struct *mm)
{
	return 1;
}

static inline int mm_is_thread_local(struct mm_struct *mm)
{
	return 1;
}
#endif

#endif /* __KERNEL__ */
#endif /* __ASM_POWERPC_TLB_H */