kexec.c 1.46 KB
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// SPDX-License-Identifier: GPL-2.0-or-later
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/*
 *  Copyright 2006 Michael Ellerman, IBM Corporation
 */

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#include <linux/kernel.h>
#include <linux/interrupt.h>

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#include <asm/setup.h>
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#include <asm/page.h>
#include <asm/firmware.h>
#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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	/*
	 * Don't risk a hypervisor call if we're crashing
	 * XXX: Why? The hypervisor is not crashing. It might be better
	 * to at least attempt unregister to avoid the hypervisor stepping
	 * on our memory.
	 */
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	if (firmware_has_feature(FW_FEATURE_SPLPAR) && !crash_shutdown) {
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		int ret;
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		int cpu = smp_processor_id();
		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) {
				pr_err("WARNING: DTL deregistration 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_slb_shadow(hwcpu);
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		if (ret) {
			pr_err("WARNING: SLB shadow buffer deregistration "
			       "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) {
			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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	if (xive_enabled()) {
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		xive_teardown_cpu();
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		if (!secondary)
			xive_shutdown();
	} else
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		xics_kexec_teardown_cpu(secondary);
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}