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 
30 		addr = __pa(get_slb_shadow());
31 		if (unregister_slb_shadow(hard_smp_processor_id(), addr))
32 			printk("SLB shadow buffer deregistration of "
33 			       "cpu %u (hw_cpu_id %d) failed\n",
34 			       smp_processor_id(),
35 			       hard_smp_processor_id());
36 
37 		addr = __pa(get_lppaca());
38 		if (unregister_vpa(hard_smp_processor_id(), addr)) {
39 			printk("VPA deregistration of cpu %u (hw_cpu_id %d) "
40 					"failed\n", smp_processor_id(),
41 					hard_smp_processor_id());
42 		}
43 	}
44 }
45 
46 static void pseries_kexec_cpu_down_mpic(int crash_shutdown, int secondary)
47 {
48 	pseries_kexec_cpu_down(crash_shutdown, secondary);
49 	mpic_teardown_this_cpu(secondary);
50 }
51 
52 void __init setup_kexec_cpu_down_mpic(void)
53 {
54 	ppc_md.kexec_cpu_down = pseries_kexec_cpu_down_mpic;
55 }
56 
57 static void pseries_kexec_cpu_down_xics(int crash_shutdown, int secondary)
58 {
59 	pseries_kexec_cpu_down(crash_shutdown, secondary);
60 	xics_kexec_teardown_cpu(secondary);
61 }
62 
63 void __init setup_kexec_cpu_down_xics(void)
64 {
65 	ppc_md.kexec_cpu_down = pseries_kexec_cpu_down_xics;
66 }
67