LXR linux/arch/powerpc/platforms/pseries/kexec.c

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