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/xics.h>
18 #include <asm/xive.h>
19 #include <asm/smp.h>
20 #include <asm/plpar_wrappers.h>
21 
22 #include "pseries.h"
23 
24 void pseries_kexec_cpu_down(int crash_shutdown, int secondary)
25 {
26 	/*
27 	 * Don't risk a hypervisor call if we're crashing
28 	 * XXX: Why? The hypervisor is not crashing. It might be better
29 	 * to at least attempt unregister to avoid the hypervisor stepping
30 	 * on our memory.
31 	 */
32 	if (firmware_has_feature(FW_FEATURE_SPLPAR) && !crash_shutdown) {
33 		int ret;
34 		int cpu = smp_processor_id();
35 		int hwcpu = hard_smp_processor_id();
36 
37 		if (get_lppaca()->dtl_enable_mask) {
38 			ret = unregister_dtl(hwcpu);
39 			if (ret) {
40 				pr_err("WARNING: DTL deregistration for cpu "
41 				       "%d (hw %d) failed with %d\n",
42 				       cpu, hwcpu, ret);
43 			}
44 		}
45 
46 		ret = unregister_slb_shadow(hwcpu);
47 		if (ret) {
48 			pr_err("WARNING: SLB shadow buffer deregistration "
49 			       "for cpu %d (hw %d) failed with %d\n",
50 			       cpu, hwcpu, ret);
51 		}
52 
53 		ret = unregister_vpa(hwcpu);
54 		if (ret) {
55 			pr_err("WARNING: VPA deregistration for cpu %d "
56 			       "(hw %d) failed with %d\n", cpu, hwcpu, ret);
57 		}
58 	}
59 
60 	if (xive_enabled()) {
61 		xive_teardown_cpu();
62 
63 		if (!secondary)
64 			xive_shutdown();
65 	} else
66 		xics_kexec_teardown_cpu(secondary);
67 }
68