| 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
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| 2 | /* |
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| 3 | * Copyright 2006 Michael Ellerman, IBM Corporation |
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| 4 | */ |
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| 5 | |
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| 6 | #include <linux/kernel.h> |
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| 7 | #include <linux/interrupt.h> |
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| 8 | |
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| 9 | #include <asm/setup.h> |
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| 10 | #include <asm/page.h> |
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| 11 | #include <asm/firmware.h> |
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| 12 | #include <asm/kexec.h> |
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| 13 | #include <asm/xics.h> |
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| 14 | #include <asm/xive.h> |
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| 15 | #include <asm/smp.h> |
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| 16 | #include <asm/plpar_wrappers.h> |
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| 17 | |
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| 18 | #include "pseries.h" |
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| 19 | |
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| 20 | void pseries_kexec_cpu_down(int crash_shutdown, int secondary) |
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| 21 | { |
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| 22 | /* |
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| 23 | * Don't risk a hypervisor call if we're crashing |
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| 24 | * XXX: Why? The hypervisor is not crashing. It might be better |
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| 25 | * to at least attempt unregister to avoid the hypervisor stepping |
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| 26 | * on our memory. |
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| 27 | */ |
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| 28 | if (firmware_has_feature(FW_FEATURE_SPLPAR) && !crash_shutdown) { |
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| 29 | int ret; |
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| 30 | int cpu = smp_processor_id(); |
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| 31 | int hwcpu = hard_smp_processor_id(); |
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| 32 | |
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| 33 | if (get_lppaca()->dtl_enable_mask) { |
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| 34 | ret = unregister_dtl(hwcpu); |
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| 35 | if (ret) { |
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| 36 | pr_err("WARNING: DTL deregistration for cpu " |
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| 37 | "%d (hw %d) failed with %d\n" , |
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| 38 | cpu, hwcpu, ret); |
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| 39 | } |
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| 40 | } |
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| 41 | |
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| 42 | ret = unregister_slb_shadow(hwcpu); |
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| 43 | if (ret) { |
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| 44 | pr_err("WARNING: SLB shadow buffer deregistration " |
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| 45 | "for cpu %d (hw %d) failed with %d\n" , |
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| 46 | cpu, hwcpu, ret); |
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| 47 | } |
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| 48 | |
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| 49 | ret = unregister_vpa(hwcpu); |
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| 50 | if (ret) { |
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| 51 | pr_err("WARNING: VPA deregistration for cpu %d " |
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| 52 | "(hw %d) failed with %d\n" , cpu, hwcpu, ret); |
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| 53 | } |
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| 54 | } |
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| 55 | |
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| 56 | if (xive_enabled()) { |
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| 57 | xive_teardown_cpu(); |
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| 58 | |
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| 59 | if (!secondary) |
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| 60 | xive_shutdown(); |
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| 61 | } else |
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| 62 | xics_kexec_teardown_cpu(secondary); |
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| 63 | } |
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| 64 | |
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