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 <asm/machdep.h>
  11 #include <asm/page.h>
  12 #include <asm/firmware.h>
  13 #include <asm/kexec.h>
  14 #include <asm/mpic.h>
  15
  16 #include "pseries.h"
  17 #include "xics.h"
  18 #include "plpar_wrappers.h"
  19
  20 static void pseries_kexec_cpu_down(int crash_shutdown, int secondary)
  21 {
  22         /* Don't risk a hypervisor call if we're crashing */
  23         if (firmware_has_feature(FW_FEATURE_SPLPAR) && !crash_shutdown) {
  24                 unsigned long addr;
  25
  26                 addr = __pa(get_slb_shadow());
  27                 if (unregister_slb_shadow(hard_smp_processor_id(), addr))
  28                         printk("SLB shadow buffer deregistration of "
  29                                "cpu %u (hw_cpu_id %d) failed\n",
  30                                smp_processor_id(),
  31                                hard_smp_processor_id());
  32
  33                 addr = __pa(get_lppaca());
  34                 if (unregister_vpa(hard_smp_processor_id(), addr)) {
  35                         printk("VPA deregistration of cpu %u (hw_cpu_id %d) "
  36                                         "failed\n", smp_processor_id(),
  37                                         hard_smp_processor_id());
  38                 }
  39         }
  40 }
  41
  42 static void pseries_kexec_cpu_down_mpic(int crash_shutdown, int secondary)
  43 {
  44         pseries_kexec_cpu_down(crash_shutdown, secondary);
  45         mpic_teardown_this_cpu(secondary);
  46 }
  47
  48 void __init setup_kexec_cpu_down_mpic(void)
  49 {
  50         ppc_md.kexec_cpu_down = pseries_kexec_cpu_down_mpic;
  51 }
  52
  53 static void pseries_kexec_cpu_down_xics(int crash_shutdown, int secondary)
  54 {
  55         pseries_kexec_cpu_down(crash_shutdown, secondary);
  56         xics_teardown_cpu(secondary);
  57 }
  58
  59 void __init setup_kexec_cpu_down_xics(void)
  60 {
  61         ppc_md.kexec_cpu_down = pseries_kexec_cpu_down_xics;
  62 }
  63
  64 static int __init pseries_kexec_setup(void)
  65 {
  66         ppc_md.machine_kexec = default_machine_kexec;
  67         ppc_md.machine_kexec_prepare = default_machine_kexec_prepare;
  68         ppc_md.machine_crash_shutdown = default_machine_crash_shutdown;
  69
  70         return 0;
  71 }
  72 __initcall(pseries_kexec_setup);