266 lines
6.3 KiB
C
266 lines
6.3 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* arch/ia64/kernel/crash.c
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*
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* Architecture specific (ia64) functions for kexec based crash dumps.
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*
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* Created by: Khalid Aziz <khalid.aziz@hp.com>
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* Copyright (C) 2005 Hewlett-Packard Development Company, L.P.
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* Copyright (C) 2005 Intel Corp Zou Nan hai <nanhai.zou@intel.com>
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*
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*/
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#include <linux/smp.h>
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#include <linux/delay.h>
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#include <linux/crash_dump.h>
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#include <linux/bootmem.h>
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#include <linux/kexec.h>
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#include <linux/elfcore.h>
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#include <linux/sysctl.h>
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#include <linux/init.h>
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#include <linux/kdebug.h>
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#include <asm/mca.h>
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int kdump_status[NR_CPUS];
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static atomic_t kdump_cpu_frozen;
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atomic_t kdump_in_progress;
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static int kdump_freeze_monarch;
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static int kdump_on_init = 1;
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static int kdump_on_fatal_mca = 1;
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extern void ia64_dump_cpu_regs(void *);
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static DEFINE_PER_CPU(struct elf_prstatus, elf_prstatus);
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void
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crash_save_this_cpu(void)
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{
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void *buf;
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unsigned long cfm, sof, sol;
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int cpu = smp_processor_id();
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struct elf_prstatus *prstatus = &per_cpu(elf_prstatus, cpu);
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elf_greg_t *dst = (elf_greg_t *)&(prstatus->pr_reg);
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memset(prstatus, 0, sizeof(*prstatus));
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prstatus->pr_pid = current->pid;
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ia64_dump_cpu_regs(dst);
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cfm = dst[43];
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sol = (cfm >> 7) & 0x7f;
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sof = cfm & 0x7f;
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dst[46] = (unsigned long)ia64_rse_skip_regs((unsigned long *)dst[46],
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sof - sol);
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buf = (u64 *) per_cpu_ptr(crash_notes, cpu);
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if (!buf)
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return;
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buf = append_elf_note(buf, KEXEC_CORE_NOTE_NAME, NT_PRSTATUS, prstatus,
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sizeof(*prstatus));
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final_note(buf);
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}
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#ifdef CONFIG_SMP
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static int
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kdump_wait_cpu_freeze(void)
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{
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int cpu_num = num_online_cpus() - 1;
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int timeout = 1000;
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while(timeout-- > 0) {
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if (atomic_read(&kdump_cpu_frozen) == cpu_num)
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return 0;
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udelay(1000);
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}
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return 1;
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}
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#endif
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void
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machine_crash_shutdown(struct pt_regs *pt)
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{
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/* This function is only called after the system
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* has paniced or is otherwise in a critical state.
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* The minimum amount of code to allow a kexec'd kernel
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* to run successfully needs to happen here.
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*
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* In practice this means shooting down the other cpus in
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* an SMP system.
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*/
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kexec_disable_iosapic();
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#ifdef CONFIG_SMP
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/*
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* If kdump_on_init is set and an INIT is asserted here, kdump will
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* be started again via INIT monarch.
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*/
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local_irq_disable();
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ia64_set_psr_mc(); /* mask MCA/INIT */
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if (atomic_inc_return(&kdump_in_progress) != 1)
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unw_init_running(kdump_cpu_freeze, NULL);
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/*
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* Now this cpu is ready for kdump.
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* Stop all others by IPI or INIT. They could receive INIT from
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* outside and might be INIT monarch, but only thing they have to
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* do is falling into kdump_cpu_freeze().
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*
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* If an INIT is asserted here:
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* - All receivers might be slaves, since some of cpus could already
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* be frozen and INIT might be masked on monarch. In this case,
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* all slaves will be frozen soon since kdump_in_progress will let
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* them into DIE_INIT_SLAVE_LEAVE.
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* - One might be a monarch, but INIT rendezvous will fail since
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* at least this cpu already have INIT masked so it never join
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* to the rendezvous. In this case, all slaves and monarch will
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* be frozen soon with no wait since the INIT rendezvous is skipped
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* by kdump_in_progress.
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*/
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kdump_smp_send_stop();
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/* not all cpu response to IPI, send INIT to freeze them */
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if (kdump_wait_cpu_freeze()) {
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kdump_smp_send_init();
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/* wait again, don't go ahead if possible */
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kdump_wait_cpu_freeze();
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}
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#endif
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}
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static void
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machine_kdump_on_init(void)
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{
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crash_save_vmcoreinfo();
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local_irq_disable();
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kexec_disable_iosapic();
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machine_kexec(ia64_kimage);
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}
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void
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kdump_cpu_freeze(struct unw_frame_info *info, void *arg)
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{
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int cpuid;
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local_irq_disable();
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cpuid = smp_processor_id();
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crash_save_this_cpu();
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current->thread.ksp = (__u64)info->sw - 16;
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ia64_set_psr_mc(); /* mask MCA/INIT and stop reentrance */
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atomic_inc(&kdump_cpu_frozen);
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kdump_status[cpuid] = 1;
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mb();
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for (;;)
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cpu_relax();
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}
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static int
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kdump_init_notifier(struct notifier_block *self, unsigned long val, void *data)
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{
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struct ia64_mca_notify_die *nd;
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struct die_args *args = data;
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if (atomic_read(&kdump_in_progress)) {
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switch (val) {
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case DIE_INIT_MONARCH_LEAVE:
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if (!kdump_freeze_monarch)
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break;
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/* fall through */
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case DIE_INIT_SLAVE_LEAVE:
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case DIE_INIT_MONARCH_ENTER:
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case DIE_MCA_RENDZVOUS_LEAVE:
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unw_init_running(kdump_cpu_freeze, NULL);
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break;
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}
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}
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if (!kdump_on_init && !kdump_on_fatal_mca)
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return NOTIFY_DONE;
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if (!ia64_kimage) {
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if (val == DIE_INIT_MONARCH_LEAVE)
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ia64_mca_printk(KERN_NOTICE
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"%s: kdump not configured\n",
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__func__);
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return NOTIFY_DONE;
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}
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if (val != DIE_INIT_MONARCH_LEAVE &&
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val != DIE_INIT_MONARCH_PROCESS &&
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val != DIE_MCA_MONARCH_LEAVE)
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return NOTIFY_DONE;
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nd = (struct ia64_mca_notify_die *)args->err;
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switch (val) {
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case DIE_INIT_MONARCH_PROCESS:
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/* Reason code 1 means machine check rendezvous*/
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if (kdump_on_init && (nd->sos->rv_rc != 1)) {
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if (atomic_inc_return(&kdump_in_progress) != 1)
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kdump_freeze_monarch = 1;
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}
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break;
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case DIE_INIT_MONARCH_LEAVE:
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/* Reason code 1 means machine check rendezvous*/
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if (kdump_on_init && (nd->sos->rv_rc != 1))
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machine_kdump_on_init();
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break;
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case DIE_MCA_MONARCH_LEAVE:
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/* *(nd->data) indicate if MCA is recoverable */
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if (kdump_on_fatal_mca && !(*(nd->data))) {
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if (atomic_inc_return(&kdump_in_progress) == 1)
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machine_kdump_on_init();
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/* We got fatal MCA while kdump!? No way!! */
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}
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break;
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}
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return NOTIFY_DONE;
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}
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#ifdef CONFIG_SYSCTL
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static struct ctl_table kdump_ctl_table[] = {
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{
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.procname = "kdump_on_init",
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.data = &kdump_on_init,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = proc_dointvec,
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},
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{
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.procname = "kdump_on_fatal_mca",
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.data = &kdump_on_fatal_mca,
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.maxlen = sizeof(int),
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.mode = 0644,
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.proc_handler = proc_dointvec,
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},
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{ }
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};
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static struct ctl_table sys_table[] = {
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{
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.procname = "kernel",
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.mode = 0555,
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.child = kdump_ctl_table,
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},
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{ }
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};
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#endif
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static int
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machine_crash_setup(void)
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{
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/* be notified before default_monarch_init_process */
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static struct notifier_block kdump_init_notifier_nb = {
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.notifier_call = kdump_init_notifier,
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.priority = 1,
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};
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int ret;
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if((ret = register_die_notifier(&kdump_init_notifier_nb)) != 0)
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return ret;
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#ifdef CONFIG_SYSCTL
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register_sysctl_table(sys_table);
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#endif
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return 0;
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}
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__initcall(machine_crash_setup);
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