1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0-or-later
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * Copyright 2006 Michael Ellerman, IBM Corporation
4*4882a593Smuzhiyun */
5*4882a593Smuzhiyun
6*4882a593Smuzhiyun #include <linux/kernel.h>
7*4882a593Smuzhiyun #include <linux/interrupt.h>
8*4882a593Smuzhiyun
9*4882a593Smuzhiyun #include <asm/machdep.h>
10*4882a593Smuzhiyun #include <asm/page.h>
11*4882a593Smuzhiyun #include <asm/firmware.h>
12*4882a593Smuzhiyun #include <asm/kexec.h>
13*4882a593Smuzhiyun #include <asm/xics.h>
14*4882a593Smuzhiyun #include <asm/xive.h>
15*4882a593Smuzhiyun #include <asm/smp.h>
16*4882a593Smuzhiyun #include <asm/plpar_wrappers.h>
17*4882a593Smuzhiyun
18*4882a593Smuzhiyun #include "pseries.h"
19*4882a593Smuzhiyun
pseries_kexec_cpu_down(int crash_shutdown,int secondary)20*4882a593Smuzhiyun void pseries_kexec_cpu_down(int crash_shutdown, int secondary)
21*4882a593Smuzhiyun {
22*4882a593Smuzhiyun /*
23*4882a593Smuzhiyun * Don't risk a hypervisor call if we're crashing
24*4882a593Smuzhiyun * XXX: Why? The hypervisor is not crashing. It might be better
25*4882a593Smuzhiyun * to at least attempt unregister to avoid the hypervisor stepping
26*4882a593Smuzhiyun * on our memory.
27*4882a593Smuzhiyun */
28*4882a593Smuzhiyun if (firmware_has_feature(FW_FEATURE_SPLPAR) && !crash_shutdown) {
29*4882a593Smuzhiyun int ret;
30*4882a593Smuzhiyun int cpu = smp_processor_id();
31*4882a593Smuzhiyun int hwcpu = hard_smp_processor_id();
32*4882a593Smuzhiyun
33*4882a593Smuzhiyun if (get_lppaca()->dtl_enable_mask) {
34*4882a593Smuzhiyun ret = unregister_dtl(hwcpu);
35*4882a593Smuzhiyun if (ret) {
36*4882a593Smuzhiyun pr_err("WARNING: DTL deregistration for cpu "
37*4882a593Smuzhiyun "%d (hw %d) failed with %d\n",
38*4882a593Smuzhiyun cpu, hwcpu, ret);
39*4882a593Smuzhiyun }
40*4882a593Smuzhiyun }
41*4882a593Smuzhiyun
42*4882a593Smuzhiyun ret = unregister_slb_shadow(hwcpu);
43*4882a593Smuzhiyun if (ret) {
44*4882a593Smuzhiyun pr_err("WARNING: SLB shadow buffer deregistration "
45*4882a593Smuzhiyun "for cpu %d (hw %d) failed with %d\n",
46*4882a593Smuzhiyun cpu, hwcpu, ret);
47*4882a593Smuzhiyun }
48*4882a593Smuzhiyun
49*4882a593Smuzhiyun ret = unregister_vpa(hwcpu);
50*4882a593Smuzhiyun if (ret) {
51*4882a593Smuzhiyun pr_err("WARNING: VPA deregistration for cpu %d "
52*4882a593Smuzhiyun "(hw %d) failed with %d\n", cpu, hwcpu, ret);
53*4882a593Smuzhiyun }
54*4882a593Smuzhiyun }
55*4882a593Smuzhiyun
56*4882a593Smuzhiyun if (xive_enabled()) {
57*4882a593Smuzhiyun xive_teardown_cpu();
58*4882a593Smuzhiyun
59*4882a593Smuzhiyun if (!secondary)
60*4882a593Smuzhiyun xive_shutdown();
61*4882a593Smuzhiyun } else
62*4882a593Smuzhiyun xics_kexec_teardown_cpu(secondary);
63*4882a593Smuzhiyun }
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