1// SPDX-License-Identifier: GPL-2.0
2// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
3
4#include <linux/bitops.h>
5#include <linux/sched.h>
6#include <linux/slab.h>
7#include <linux/mm.h>
8
9#include <asm/asid.h>
10#include <asm/mmu_context.h>
11#include <asm/smp.h>
12#include <asm/tlbflush.h>
13
14static DEFINE_PER_CPU(atomic64_t, active_asids);
15static DEFINE_PER_CPU(u64, reserved_asids);
16
17struct asid_info asid_info;
18
19void check_and_switch_context(struct mm_struct *mm, unsigned int cpu)
20{
21	asid_check_context(&asid_info, &mm->context.asid, cpu, mm);
22}
23
24static void asid_flush_cpu_ctxt(void)
25{
26	local_tlb_invalid_all();
27}
28
29static int asids_init(void)
30{
31	BUG_ON(((1 << CONFIG_CPU_ASID_BITS) - 1) <= num_possible_cpus());
32
33	if (asid_allocator_init(&asid_info, CONFIG_CPU_ASID_BITS, 1,
34				asid_flush_cpu_ctxt))
35		panic("Unable to initialize ASID allocator for %lu ASIDs\n",
36		      NUM_ASIDS(&asid_info));
37
38	asid_info.active = &active_asids;
39	asid_info.reserved = &reserved_asids;
40
41	pr_info("ASID allocator initialised with %lu entries\n",
42		NUM_CTXT_ASIDS(&asid_info));
43
44	return 0;
45}
46early_initcall(asids_init);
47