kernel/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/mpic.h>
  18 #include <asm/xics.h>
  19 #include <asm/smp.h>
  20 #include <asm/plpar_wrappers.h>
  21
  22 #include "pseries.h"
  23
  24 static void pseries_kexec_cpu_down(int crash_shutdown, int secondary)
  25 {
  26         /* Don't risk a hypervisor call if we're crashing */
  27         if (firmware_has_feature(FW_FEATURE_SPLPAR) && !crash_shutdown) {
  28                 int ret;
  29                 int cpu = smp_processor_id();
  30                 int hwcpu = hard_smp_processor_id();
  31
  32                 if (get_lppaca()->dtl_enable_mask) {
  33                         ret = unregister_dtl(hwcpu);
  34                         if (ret) {
  35                                 pr_err("WARNING: DTL deregistration for cpu "
  36                                        "%d (hw %d) failed with %d\n",
  37                                        cpu, hwcpu, ret);
  38                         }
  39                 }
  40
  41                 ret = unregister_slb_shadow(hwcpu);
  42                 if (ret) {
  43                         pr_err("WARNING: SLB shadow buffer deregistration "
  44                                "for cpu %d (hw %d) failed with %d\n",
  45                                cpu, hwcpu, ret);
  46                 }
  47
  48                 ret = unregister_vpa(hwcpu);
  49                 if (ret) {
  50                         pr_err("WARNING: VPA deregistration for cpu %d "
  51                                "(hw %d) failed with %d\n", cpu, hwcpu, ret);
  52                 }
  53         }
  54 }
  55
  56 static void pseries_kexec_cpu_down_mpic(int crash_shutdown, int secondary)
  57 {
  58         pseries_kexec_cpu_down(crash_shutdown, secondary);
  59         mpic_teardown_this_cpu(secondary);
  60 }
  61
  62 void __init setup_kexec_cpu_down_mpic(void)
  63 {
  64         ppc_md.kexec_cpu_down = pseries_kexec_cpu_down_mpic;
  65 }
  66
  67 static void pseries_kexec_cpu_down_xics(int crash_shutdown, int secondary)
  68 {
  69         pseries_kexec_cpu_down(crash_shutdown, secondary);
  70         xics_kexec_teardown_cpu(secondary);
  71 }
  72
  73 void __init setup_kexec_cpu_down_xics(void)
  74 {
  75         ppc_md.kexec_cpu_down = pseries_kexec_cpu_down_xics;
  76 }