arch/csky/mm/context.c

   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
  14 static DEFINE_PER_CPU(atomic64_t, active_asids);
  15 static DEFINE_PER_CPU(u64, reserved_asids);
  16
  17 struct asid_info asid_info;
  18
  19 void 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
  24 static void asid_flush_cpu_ctxt(void)
  25 {
  26         local_tlb_invalid_all();
  27 }
  28
  29 static 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 }
  46 early_initcall(asids_init);