arch/powerpc/platforms/pseries/kexec.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  *  Copyright 2006 Michael Ellerman, IBM Corporation
   4  */
   5
   6 #include <linux/kernel.h>
   7 #include <linux/interrupt.h>
   8
   9 #include <asm/setup.h>
  10 #include <asm/page.h>
  11 #include <asm/firmware.h>
  12 #include <asm/kexec.h>
  13 #include <asm/xics.h>
  14 #include <asm/xive.h>
  15 #include <asm/smp.h>
  16 #include <asm/plpar_wrappers.h>
  17
  18 #include "pseries.h"
  19
  20 void pseries_kexec_cpu_down(int crash_shutdown, int secondary)
  21 {
  22         /*
  23          * Don't risk a hypervisor call if we're crashing
  24          * XXX: Why? The hypervisor is not crashing. It might be better
  25          * to at least attempt unregister to avoid the hypervisor stepping
  26          * on our memory.
  27          */
  28         if (firmware_has_feature(FW_FEATURE_SPLPAR) && !crash_shutdown) {
  29                 int ret;
  30                 int cpu = smp_processor_id();
  31                 int hwcpu = hard_smp_processor_id();
  32
  33                 if (get_lppaca()->dtl_enable_mask) {
  34                         ret = unregister_dtl(hwcpu);
  35                         if (ret) {
  36                                 pr_err("WARNING: DTL deregistration for cpu "
  37                                        "%d (hw %d) failed with %d\n",
  38                                        cpu, hwcpu, ret);
  39                         }
  40                 }
  41
  42                 ret = unregister_slb_shadow(hwcpu);
  43                 if (ret) {
  44                         pr_err("WARNING: SLB shadow buffer deregistration "
  45                                "for cpu %d (hw %d) failed with %d\n",
  46                                cpu, hwcpu, ret);
  47                 }
  48
  49                 ret = unregister_vpa(hwcpu);
  50                 if (ret) {
  51                         pr_err("WARNING: VPA deregistration for cpu %d "
  52                                "(hw %d) failed with %d\n", cpu, hwcpu, ret);
  53                 }
  54         }
  55
  56         if (xive_enabled()) {
  57                 xive_teardown_cpu();
  58
  59                 if (!secondary)
  60                         xive_shutdown();
  61         } else
  62                 xics_kexec_teardown_cpu(secondary);
  63 }