tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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
24void 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_kexec_teardown_cpu(secondary);
62 else
63 xics_kexec_teardown_cpu(secondary);
64}