context.c (1109B)
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);