67 lines
1.7 KiB
C
67 lines
1.7 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright 2006 Michael Ellerman, IBM Corporation
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*/
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#include <linux/kernel.h>
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#include <linux/interrupt.h>
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#include <asm/setup.h>
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#include <asm/page.h>
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#include <asm/firmware.h>
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#include <asm/kexec.h>
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#include <asm/xics.h>
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#include <asm/xive.h>
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#include <asm/smp.h>
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#include <asm/plpar_wrappers.h>
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#include "pseries.h"
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void pseries_kexec_cpu_down(int crash_shutdown, int secondary)
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{
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/*
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* Ensure vpa/slb_shadow/dtl cleanup even while we are crashing.
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* Why? The hypervisor is not crashing so at least attempt unregister to
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* avoid the hypervisor stepping on our memory. If hypervisor or kexec
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* kernel steps on the old memory allocated to these areas before the
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* new kexec-kernel happens to allocate and register new areas,
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* the hypervisor will see invalid content which may cause
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* unexpected behavior.
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*/
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if (firmware_has_feature(FW_FEATURE_SPLPAR)) {
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int ret;
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int cpu = smp_processor_id();
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int hwcpu = hard_smp_processor_id();
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if (get_lppaca()->dtl_enable_mask) {
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ret = unregister_dtl(hwcpu);
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if (ret) {
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pr_err("WARNING: DTL deregistration for cpu "
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"%d (hw %d) failed with %d\n",
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cpu, hwcpu, ret);
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}
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}
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ret = unregister_slb_shadow(hwcpu);
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if (ret) {
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pr_err("WARNING: SLB shadow buffer deregistration "
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"for cpu %d (hw %d) failed with %d\n",
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cpu, hwcpu, ret);
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}
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ret = unregister_vpa(hwcpu);
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if (ret) {
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pr_err("WARNING: VPA deregistration for cpu %d "
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"(hw %d) failed with %d\n", cpu, hwcpu, ret);
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}
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}
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if (xive_enabled()) {
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xive_teardown_cpu();
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if (!secondary)
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xive_shutdown();
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} else
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xics_kexec_teardown_cpu(secondary);
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}
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