arch/powerpc/platforms/pseries/kexec.c

   1 /*
   2  *  Copyright 2006 Michael Ellerman, IBM Corporation
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public License
   6  * as published by the Free Software Foundation; either version
   7  * 2 of the License, or (at your option) any later version.
   8  */
   9
  10 #include <linux/kernel.h>
  11 #include <linux/interrupt.h>
  12
  13 #include <asm/machdep.h>
  14 #include <asm/page.h>
  15 #include <asm/firmware.h>
  16 #include <asm/kexec.h>
  17 #include <asm/xics.h>
  18 #include <asm/xive.h>
  19 #include <asm/smp.h>
  20 #include <asm/plpar_wrappers.h>
  21
  22 #include "pseries.h"
  23
  24 void pseries_kexec_cpu_down(int crash_shutdown, int secondary)
  25 {
  26         /*
  27          * Don't risk a hypervisor call if we're crashing
  28          * XXX: Why? The hypervisor is not crashing. It might be better
  29          * to at least attempt unregister to avoid the hypervisor stepping
  30          * on our memory.
  31          */
  32         if (firmware_has_feature(FW_FEATURE_SPLPAR) && !crash_shutdown) {
  33                 int ret;
  34                 int cpu = smp_processor_id();
  35                 int hwcpu = hard_smp_processor_id();
  36
  37                 if (get_lppaca()->dtl_enable_mask) {
  38                         ret = unregister_dtl(hwcpu);
  39                         if (ret) {
  40                                 pr_err("WARNING: DTL deregistration for cpu "
  41                                        "%d (hw %d) failed with %d\n",
  42                                        cpu, hwcpu, ret);
  43                         }
  44                 }
  45
  46                 ret = unregister_slb_shadow(hwcpu);
  47                 if (ret) {
  48                         pr_err("WARNING: SLB shadow buffer deregistration "
  49                                "for cpu %d (hw %d) failed with %d\n",
  50                                cpu, hwcpu, ret);
  51                 }
  52
  53                 ret = unregister_vpa(hwcpu);
  54                 if (ret) {
  55                         pr_err("WARNING: VPA deregistration for cpu %d "
  56                                "(hw %d) failed with %d\n", cpu, hwcpu, ret);
  57                 }
  58         }
  59
  60         if (xive_enabled()) {
  61                 xive_teardown_cpu();
  62
  63                 if (!secondary)
  64                         xive_shutdown();
  65         } else
  66                 xics_kexec_teardown_cpu(secondary);
  67 }