summaryrefslogtreecommitdiff
path: root/arch/ia64/kernel/crash.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/ia64/kernel/crash.c')
-rw-r--r--arch/ia64/kernel/crash.c257
1 files changed, 0 insertions, 257 deletions
diff --git a/arch/ia64/kernel/crash.c b/arch/ia64/kernel/crash.c
deleted file mode 100644
index 88b3ce3e66cd..000000000000
--- a/arch/ia64/kernel/crash.c
+++ /dev/null
@@ -1,257 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-/*
- * arch/ia64/kernel/crash.c
- *
- * Architecture specific (ia64) functions for kexec based crash dumps.
- *
- * Created by: Khalid Aziz <khalid.aziz@hp.com>
- * Copyright (C) 2005 Hewlett-Packard Development Company, L.P.
- * Copyright (C) 2005 Intel Corp Zou Nan hai <nanhai.zou@intel.com>
- *
- */
-#include <linux/smp.h>
-#include <linux/delay.h>
-#include <linux/crash_dump.h>
-#include <linux/memblock.h>
-#include <linux/kexec.h>
-#include <linux/elfcore.h>
-#include <linux/reboot.h>
-#include <linux/sysctl.h>
-#include <linux/init.h>
-#include <linux/kdebug.h>
-
-#include <asm/mca.h>
-
-int kdump_status[NR_CPUS];
-static atomic_t kdump_cpu_frozen;
-atomic_t kdump_in_progress;
-static int kdump_freeze_monarch;
-static int kdump_on_init = 1;
-static int kdump_on_fatal_mca = 1;
-
-extern void ia64_dump_cpu_regs(void *);
-
-static DEFINE_PER_CPU(struct elf_prstatus, elf_prstatus);
-
-void
-crash_save_this_cpu(void)
-{
- void *buf;
- unsigned long cfm, sof, sol;
-
- int cpu = smp_processor_id();
- struct elf_prstatus *prstatus = &per_cpu(elf_prstatus, cpu);
-
- elf_greg_t *dst = (elf_greg_t *)&(prstatus->pr_reg);
- memset(prstatus, 0, sizeof(*prstatus));
- prstatus->common.pr_pid = current->pid;
-
- ia64_dump_cpu_regs(dst);
- cfm = dst[43];
- sol = (cfm >> 7) & 0x7f;
- sof = cfm & 0x7f;
- dst[46] = (unsigned long)ia64_rse_skip_regs((unsigned long *)dst[46],
- sof - sol);
-
- buf = (u64 *) per_cpu_ptr(crash_notes, cpu);
- if (!buf)
- return;
- buf = append_elf_note(buf, KEXEC_CORE_NOTE_NAME, NT_PRSTATUS, prstatus,
- sizeof(*prstatus));
- final_note(buf);
-}
-
-#ifdef CONFIG_SMP
-static int
-kdump_wait_cpu_freeze(void)
-{
- int cpu_num = num_online_cpus() - 1;
- int timeout = 1000;
- while(timeout-- > 0) {
- if (atomic_read(&kdump_cpu_frozen) == cpu_num)
- return 0;
- udelay(1000);
- }
- return 1;
-}
-#endif
-
-void
-machine_crash_shutdown(struct pt_regs *pt)
-{
- /* This function is only called after the system
- * has paniced or is otherwise in a critical state.
- * The minimum amount of code to allow a kexec'd kernel
- * to run successfully needs to happen here.
- *
- * In practice this means shooting down the other cpus in
- * an SMP system.
- */
- kexec_disable_iosapic();
-#ifdef CONFIG_SMP
- /*
- * If kdump_on_init is set and an INIT is asserted here, kdump will
- * be started again via INIT monarch.
- */
- local_irq_disable();
- ia64_set_psr_mc(); /* mask MCA/INIT */
- if (atomic_inc_return(&kdump_in_progress) != 1)
- unw_init_running(kdump_cpu_freeze, NULL);
-
- /*
- * Now this cpu is ready for kdump.
- * Stop all others by IPI or INIT. They could receive INIT from
- * outside and might be INIT monarch, but only thing they have to
- * do is falling into kdump_cpu_freeze().
- *
- * If an INIT is asserted here:
- * - All receivers might be slaves, since some of cpus could already
- * be frozen and INIT might be masked on monarch. In this case,
- * all slaves will be frozen soon since kdump_in_progress will let
- * them into DIE_INIT_SLAVE_LEAVE.
- * - One might be a monarch, but INIT rendezvous will fail since
- * at least this cpu already have INIT masked so it never join
- * to the rendezvous. In this case, all slaves and monarch will
- * be frozen soon with no wait since the INIT rendezvous is skipped
- * by kdump_in_progress.
- */
- kdump_smp_send_stop();
- /* not all cpu response to IPI, send INIT to freeze them */
- if (kdump_wait_cpu_freeze()) {
- kdump_smp_send_init();
- /* wait again, don't go ahead if possible */
- kdump_wait_cpu_freeze();
- }
-#endif
-}
-
-static void
-machine_kdump_on_init(void)
-{
- crash_save_vmcoreinfo();
- local_irq_disable();
- kexec_disable_iosapic();
- machine_kexec(ia64_kimage);
-}
-
-void
-kdump_cpu_freeze(struct unw_frame_info *info, void *arg)
-{
- int cpuid;
-
- local_irq_disable();
- cpuid = smp_processor_id();
- crash_save_this_cpu();
- current->thread.ksp = (__u64)info->sw - 16;
-
- ia64_set_psr_mc(); /* mask MCA/INIT and stop reentrance */
-
- atomic_inc(&kdump_cpu_frozen);
- kdump_status[cpuid] = 1;
- mb();
- for (;;)
- cpu_relax();
-}
-
-static int
-kdump_init_notifier(struct notifier_block *self, unsigned long val, void *data)
-{
- struct ia64_mca_notify_die *nd;
- struct die_args *args = data;
-
- if (atomic_read(&kdump_in_progress)) {
- switch (val) {
- case DIE_INIT_MONARCH_LEAVE:
- if (!kdump_freeze_monarch)
- break;
- fallthrough;
- case DIE_INIT_SLAVE_LEAVE:
- case DIE_INIT_MONARCH_ENTER:
- case DIE_MCA_RENDZVOUS_LEAVE:
- unw_init_running(kdump_cpu_freeze, NULL);
- break;
- }
- }
-
- if (!kdump_on_init && !kdump_on_fatal_mca)
- return NOTIFY_DONE;
-
- if (!ia64_kimage) {
- if (val == DIE_INIT_MONARCH_LEAVE)
- ia64_mca_printk(KERN_NOTICE
- "%s: kdump not configured\n",
- __func__);
- return NOTIFY_DONE;
- }
-
- if (val != DIE_INIT_MONARCH_LEAVE &&
- val != DIE_INIT_MONARCH_PROCESS &&
- val != DIE_MCA_MONARCH_LEAVE)
- return NOTIFY_DONE;
-
- nd = (struct ia64_mca_notify_die *)args->err;
-
- switch (val) {
- case DIE_INIT_MONARCH_PROCESS:
- /* Reason code 1 means machine check rendezvous*/
- if (kdump_on_init && (nd->sos->rv_rc != 1)) {
- if (atomic_inc_return(&kdump_in_progress) != 1)
- kdump_freeze_monarch = 1;
- }
- break;
- case DIE_INIT_MONARCH_LEAVE:
- /* Reason code 1 means machine check rendezvous*/
- if (kdump_on_init && (nd->sos->rv_rc != 1))
- machine_kdump_on_init();
- break;
- case DIE_MCA_MONARCH_LEAVE:
- /* *(nd->data) indicate if MCA is recoverable */
- if (kdump_on_fatal_mca && !(*(nd->data))) {
- if (atomic_inc_return(&kdump_in_progress) == 1)
- machine_kdump_on_init();
- /* We got fatal MCA while kdump!? No way!! */
- }
- break;
- }
- return NOTIFY_DONE;
-}
-
-#ifdef CONFIG_SYSCTL
-static struct ctl_table kdump_ctl_table[] = {
- {
- .procname = "kdump_on_init",
- .data = &kdump_on_init,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec,
- },
- {
- .procname = "kdump_on_fatal_mca",
- .data = &kdump_on_fatal_mca,
- .maxlen = sizeof(int),
- .mode = 0644,
- .proc_handler = proc_dointvec,
- },
- { }
-};
-#endif
-
-static int
-machine_crash_setup(void)
-{
- /* be notified before default_monarch_init_process */
- static struct notifier_block kdump_init_notifier_nb = {
- .notifier_call = kdump_init_notifier,
- .priority = 1,
- };
- int ret;
- if((ret = register_die_notifier(&kdump_init_notifier_nb)) != 0)
- return ret;
-#ifdef CONFIG_SYSCTL
- register_sysctl("kernel", kdump_ctl_table);
-#endif
- return 0;
-}
-
-__initcall(machine_crash_setup);
-