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1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _PARISC_TLBFLUSH_H
3#define _PARISC_TLBFLUSH_H
4
5/* TLB flushing routines.... */
6
7#include <linux/mm.h>
8#include <linux/sched.h>
9#include <asm/mmu_context.h>
10
11
12/* This is for the serialisation of PxTLB broadcasts. At least on the
13 * N class systems, only one PxTLB inter processor broadcast can be
14 * active at any one time on the Merced bus. This tlb purge
15 * synchronisation is fairly lightweight and harmless so we activate
16 * it on all systems not just the N class.
17
18 * It is also used to ensure PTE updates are atomic and consistent
19 * with the TLB.
20 */
21extern spinlock_t pa_tlb_lock;
22
23#define purge_tlb_start(flags) spin_lock_irqsave(&pa_tlb_lock, flags)
24#define purge_tlb_end(flags) spin_unlock_irqrestore(&pa_tlb_lock, flags)
25
26extern void flush_tlb_all(void);
27extern void flush_tlb_all_local(void *);
28
29#define smp_flush_tlb_all() flush_tlb_all()
30
31int __flush_tlb_range(unsigned long sid,
32 unsigned long start, unsigned long end);
33
34#define flush_tlb_range(vma, start, end) \
35 __flush_tlb_range((vma)->vm_mm->context, start, end)
36
37#define flush_tlb_kernel_range(start, end) \
38 __flush_tlb_range(0, start, end)
39
40/*
41 * flush_tlb_mm()
42 *
43 * The code to switch to a new context is NOT valid for processes
44 * which play with the space id's. Thus, we have to preserve the
45 * space and just flush the entire tlb. However, the compilers,
46 * dynamic linker, etc, do not manipulate space id's, so there
47 * could be a significant performance benefit in switching contexts
48 * and not flushing the whole tlb.
49 */
50
51static inline void flush_tlb_mm(struct mm_struct *mm)
52{
53 BUG_ON(mm == &init_mm); /* Should never happen */
54
55#if 1 || defined(CONFIG_SMP)
56 /* Except for very small threads, flushing the whole TLB is
57 * faster than using __flush_tlb_range. The pdtlb and pitlb
58 * instructions are very slow because of the TLB broadcast.
59 * It might be faster to do local range flushes on all CPUs
60 * on PA 2.0 systems.
61 */
62 flush_tlb_all();
63#else
64 /* FIXME: currently broken, causing space id and protection ids
65 * to go out of sync, resulting in faults on userspace accesses.
66 * This approach needs further investigation since running many
67 * small applications (e.g., GCC testsuite) is faster on HP-UX.
68 */
69 if (mm) {
70 if (mm->context != 0)
71 free_sid(mm->context);
72 mm->context = alloc_sid();
73 if (mm == current->active_mm)
74 load_context(mm->context);
75 }
76#endif
77}
78
79static inline void flush_tlb_page(struct vm_area_struct *vma,
80 unsigned long addr)
81{
82 unsigned long flags, sid;
83
84 sid = vma->vm_mm->context;
85 purge_tlb_start(flags);
86 mtsp(sid, 1);
87 pdtlb(addr);
88 if (unlikely(split_tlb))
89 pitlb(addr);
90 purge_tlb_end(flags);
91}
92#endif