Quelle  kexec.c   Sprache: C

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 *  Copyright 2006 Michael Ellerman, IBM Corporation
 */

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

#include <asm/setup.h>
#include <asm/page.h>
#include <asm/firmware.h>
#include <asm/kexec.h>
#include <asm/xics.h>
#include <asm/xive.h>
#include <asm/smp.h>
#include <asm/plpar_wrappers.h>

#include "pseries.h"

void pseries_kexec_cpu_down(int crash_shutdown, int secondary)
{
 /*
 * 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.
 */
 if (firmware_has_feature(FW_FEATURE_SPLPAR) && !crash_shutdown) {
  int ret;
  int cpu = smp_processor_id();
  int hwcpu = hard_smp_processor_id();

  if (get_lppaca()->dtl_enable_mask) {
   ret = unregister_dtl(hwcpu);
   if (ret) {
    pr_err("WARNING: DTL deregistration for cpu "
           "%d (hw %d) failed with %d\n",
           cpu, hwcpu, ret);
   }
  }

  ret = unregister_slb_shadow(hwcpu);
  if (ret) {
   pr_err("WARNING: SLB shadow buffer deregistration "
          "for cpu %d (hw %d) failed with %d\n",
          cpu, hwcpu, ret);
  }

  ret = unregister_vpa(hwcpu);
  if (ret) {
   pr_err("WARNING: VPA deregistration for cpu %d "
          "(hw %d) failed with %d\n", cpu, hwcpu, ret);
  }
 }

 if (xive_enabled()) {
  xive_teardown_cpu();

  if (!secondary)
   xive_shutdown();
 } else
  xics_kexec_teardown_cpu(secondary);
}