/* 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.space_id, 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