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