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/smp.h>
  19 #include <asm/plpar_wrappers.h>
  20
  21 #include "pseries.h"
  22
  23 void pseries_kexec_cpu_down(int crash_shutdown, int secondary)
  24 {
  25         /* Don't risk a hypervisor call if we're crashing */
  26         if (firmware_has_feature(FW_FEATURE_SPLPAR) && !crash_shutdown) {
  27                 int ret;
  28                 int cpu = smp_processor_id();
  29                 int hwcpu = hard_smp_processor_id();
  30
  31                 if (get_lppaca()->dtl_enable_mask) {
  32                         ret = unregister_dtl(hwcpu);
  33                         if (ret) {
  34                                 pr_err("WARNING: DTL deregistration for cpu "
  35                                        "%d (hw %d) failed with %d\n",
  36                                        cpu, hwcpu, ret);
  37                         }
  38                 }
  39
  40                 ret = unregister_slb_shadow(hwcpu);
  41                 if (ret) {
  42                         pr_err("WARNING: SLB shadow buffer deregistration "
  43                                "for cpu %d (hw %d) failed with %d\n",
  44                                cpu, hwcpu, ret);
  45                 }
  46
  47                 ret = unregister_vpa(hwcpu);
  48                 if (ret) {
  49                         pr_err("WARNING: VPA deregistration for cpu %d "
  50                                "(hw %d) failed with %d\n", cpu, hwcpu, ret);
  51                 }
  52         }
  53
  54         xics_kexec_teardown_cpu(secondary);
  55 }