1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Copyright 2006 Michael Ellerman, IBM Corporation
4 */
5
6 #include <linux/kernel.h>
7 #include <linux/interrupt.h>
8
9 #include <asm/setup.h>
10 #include <asm/page.h>
11 #include <asm/firmware.h>
12 #include <asm/kexec.h>
13 #include <asm/xics.h>
14 #include <asm/xive.h>
15 #include <asm/smp.h>
16 #include <asm/plpar_wrappers.h>
17
18 #include "pseries.h"
19
20 void pseries_kexec_cpu_down(int crash_shutdown, int secondary)
21 {
22 /*
23 * Don't risk a hypervisor call if we're crashing
24 * XXX: Why? The hypervisor is not crashing. It might be better
25 * to at least attempt unregister to avoid the hypervisor stepping
26 * on our memory.
27 */
28 if (firmware_has_feature(FW_FEATURE_SPLPAR) && !crash_shutdown) {
29 int ret;
30 int cpu = smp_processor_id();
31 int hwcpu = hard_smp_processor_id();
32
33 if (get_lppaca()->dtl_enable_mask) {
34 ret = unregister_dtl(hwcpu);
35 if (ret) {
36 pr_err("WARNING: DTL deregistration for cpu "
37 "%d (hw %d) failed with %d\n",
38 cpu, hwcpu, ret);
39 }
40 }
41
42 ret = unregister_slb_shadow(hwcpu);
43 if (ret) {
44 pr_err("WARNING: SLB shadow buffer deregistration "
45 "for cpu %d (hw %d) failed with %d\n",
46 cpu, hwcpu, ret);
47 }
48
49 ret = unregister_vpa(hwcpu);
50 if (ret) {
51 pr_err("WARNING: VPA deregistration for cpu %d "
52 "(hw %d) failed with %d\n", cpu, hwcpu, ret);
53 }
54 }
55
56 if (xive_enabled()) {
57 xive_teardown_cpu();
58
59 if (!secondary)
60 xive_shutdown();
61 } else
62 xics_kexec_teardown_cpu(secondary);
63 }
64
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