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
11extern void flush_tlb_all(void);
12extern void flush_tlb_all_local(void *);
13
14#define smp_flush_tlb_all()	flush_tlb_all()
15
16int __flush_tlb_range(unsigned long sid,
17	unsigned long start, unsigned long end);
18
19#define flush_tlb_range(vma, start, end) \
20	__flush_tlb_range((vma)->vm_mm->context.space_id, start, end)
21
22#define flush_tlb_kernel_range(start, end) \
23	__flush_tlb_range(0, start, end)
24
25/*
26 * flush_tlb_mm()
27 *
28 * The code to switch to a new context is NOT valid for processes
29 * which play with the space id's.  Thus, we have to preserve the
30 * space and just flush the entire tlb.  However, the compilers,
31 * dynamic linker, etc, do not manipulate space id's, so there
32 * could be a significant performance benefit in switching contexts
33 * and not flushing the whole tlb.
34 */
35
36static inline void flush_tlb_mm(struct mm_struct *mm)
37{
38	BUG_ON(mm == &init_mm); /* Should never happen */
39
40#if 1 || defined(CONFIG_SMP)
41	/* Except for very small threads, flushing the whole TLB is
42	 * faster than using __flush_tlb_range.  The pdtlb and pitlb
43	 * instructions are very slow because of the TLB broadcast.
44	 * It might be faster to do local range flushes on all CPUs
45	 * on PA 2.0 systems.
46	 */
47	flush_tlb_all();
48#else
49	/* FIXME: currently broken, causing space id and protection ids
50	 * to go out of sync, resulting in faults on userspace accesses.
51	 * This approach needs further investigation since running many
52	 * small applications (e.g., GCC testsuite) is faster on HP-UX.
53	 */
54	if (mm) {
55		if (mm->context != 0)
56			free_sid(mm->context);
57		mm->context = alloc_sid();
58		if (mm == current->active_mm)
59			load_context(mm->context);
60	}
61#endif
62}
63
64static inline void flush_tlb_page(struct vm_area_struct *vma,
65	unsigned long addr)
66{
67	purge_tlb_entries(vma->vm_mm, addr);
68}
69#endif
70