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 }
77