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
  21 #include "pseries.h"
  22 #include "plpar_wrappers.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                 unsigned long addr;
  29                 int ret;
  30
  31                 if (get_lppaca()->dtl_enable_mask) {
  32                         ret = unregister_dtl(hard_smp_processor_id());
  33                         if (ret) {
  34                                 pr_err("WARNING: DTL deregistration for cpu "
  35                                        "%d (hw %d) failed with %d\n",
  36                                        smp_processor_id(),
  37                                        hard_smp_processor_id(), ret);
  38                         }
  39                 }
  40
  41                 addr = __pa(get_slb_shadow());
  42                 if (unregister_slb_shadow(hard_smp_processor_id(), addr))
  43                         printk("SLB shadow buffer deregistration of "
  44                                "cpu %u (hw_cpu_id %d) failed\n",
  45                                smp_processor_id(),
  46                                hard_smp_processor_id());
  47
  48                 addr = __pa(get_lppaca());
  49                 if (unregister_vpa(hard_smp_processor_id(), addr)) {
  50                         printk("VPA deregistration of cpu %u (hw_cpu_id %d) "
  51                                         "failed\n", smp_processor_id(),
  52                                         hard_smp_processor_id());
  53                 }
  54         }
  55 }
  56
  57 static void pseries_kexec_cpu_down_mpic(int crash_shutdown, int secondary)
  58 {
  59         pseries_kexec_cpu_down(crash_shutdown, secondary);
  60         mpic_teardown_this_cpu(secondary);
  61 }
  62
  63 void __init setup_kexec_cpu_down_mpic(void)
  64 {
  65         ppc_md.kexec_cpu_down = pseries_kexec_cpu_down_mpic;
  66 }
  67
  68 static void pseries_kexec_cpu_down_xics(int crash_shutdown, int secondary)
  69 {
  70         pseries_kexec_cpu_down(crash_shutdown, secondary);
  71         xics_kexec_teardown_cpu(secondary);
  72 }
  73
  74 void __init setup_kexec_cpu_down_xics(void)
  75 {
  76         ppc_md.kexec_cpu_down = pseries_kexec_cpu_down_xics;
  77 }