Orange Pi5 kernel

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _PARISC_TLBFLUSH_H
#define _PARISC_TLBFLUSH_H
 
/* TLB flushing routines.... */
 
#include <linux/mm.h>
#include <linux/sched.h>
#include <asm/mmu_context.h>
 
extern void flush_tlb_all(void);
extern void flush_tlb_all_local(void *);
 
#define smp_flush_tlb_all()	flush_tlb_all()
 
int __flush_tlb_range(unsigned long sid,
<------>unsigned long start, unsigned long end);
 
#define flush_tlb_range(vma, start, end) \
<------>__flush_tlb_range((vma)->vm_mm->context, start, end)
 
#define flush_tlb_kernel_range(start, end) \
<------>__flush_tlb_range(0, start, end)
 
/*
 * flush_tlb_mm()
 *
 * The code to switch to a new context is NOT valid for processes
 * which play with the space id's.  Thus, we have to preserve the
 * space and just flush the entire tlb.  However, the compilers,
 * dynamic linker, etc, do not manipulate space id's, so there
 * could be a significant performance benefit in switching contexts
 * and not flushing the whole tlb.
 */
 
static inline void flush_tlb_mm(struct mm_struct *mm)
{
<------>BUG_ON(mm == &init_mm); /* Should never happen */
 
#if 1 || defined(CONFIG_SMP)
<------>/* Except for very small threads, flushing the whole TLB is
<------> * faster than using __flush_tlb_range.  The pdtlb and pitlb
<------> * instructions are very slow because of the TLB broadcast.
<------> * It might be faster to do local range flushes on all CPUs
<------> * on PA 2.0 systems.
<------> */
<------>flush_tlb_all();
#else
<------>/* FIXME: currently broken, causing space id and protection ids
<------> * to go out of sync, resulting in faults on userspace accesses.
<------> * This approach needs further investigation since running many
<------> * small applications (e.g., GCC testsuite) is faster on HP-UX.
<------> */
<------>if (mm) {
<------><------>if (mm->context != 0)
<------><------><------>free_sid(mm->context);
<------><------>mm->context = alloc_sid();
<------><------>if (mm == current->active_mm)
<------><------><------>load_context(mm->context);
<------>}
#endif
}
 
static inline void flush_tlb_page(struct vm_area_struct *vma,
<------>unsigned long addr)
{
<------>purge_tlb_entries(vma->vm_mm, addr);
}
#endif