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
20void 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
65void pseries_machine_kexec(struct kimage *image)
66{
67	if (firmware_has_feature(FW_FEATURE_SET_MODE))
68		pseries_disable_reloc_on_exc();
69
70	default_machine_kexec(image);
71}
72