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 | |
65 | void 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 | |