Linux Kernel  3.7.1
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kexec.c
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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  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 
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 
74 {
75  ppc_md.kexec_cpu_down = pseries_kexec_cpu_down_xics;
76 }