linux/arch/csky/mm/context.c
Guo Ren 22d55f02b8 csky: Use generic asid algorithm to implement switch_mm
Use linux generic asid/vmid algorithm to implement csky
switch_mm function. The algorithm is from arm and it could
work with SMP system. It'll help reduce tlb flush for
switch_mm in task/vm switch.

Signed-off-by: Guo Ren <ren_guo@c-sky.com>
Cc: Arnd Bergmann <arnd@arndb.de>
2019-07-19 14:21:36 +08:00

47 lines
1.1 KiB
C

// SPDX-License-Identifier: GPL-2.0
// Copyright (C) 2018 Hangzhou C-SKY Microsystems co.,ltd.
#include <linux/bitops.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/mm.h>
#include <asm/asid.h>
#include <asm/mmu_context.h>
#include <asm/smp.h>
#include <asm/tlbflush.h>
static DEFINE_PER_CPU(atomic64_t, active_asids);
static DEFINE_PER_CPU(u64, reserved_asids);
struct asid_info asid_info;
void check_and_switch_context(struct mm_struct *mm, unsigned int cpu)
{
asid_check_context(&asid_info, &mm->context.asid, cpu, mm);
}
static void asid_flush_cpu_ctxt(void)
{
local_tlb_invalid_all();
}
static int asids_init(void)
{
BUG_ON(((1 << CONFIG_CPU_ASID_BITS) - 1) <= num_possible_cpus());
if (asid_allocator_init(&asid_info, CONFIG_CPU_ASID_BITS, 1,
asid_flush_cpu_ctxt))
panic("Unable to initialize ASID allocator for %lu ASIDs\n",
NUM_ASIDS(&asid_info));
asid_info.active = &active_asids;
asid_info.reserved = &reserved_asids;
pr_info("ASID allocator initialised with %lu entries\n",
NUM_CTXT_ASIDS(&asid_info));
return 0;
}
early_initcall(asids_init);