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