diff options
Diffstat (limited to 'arch/ia64/kernel/crash.c')
| -rw-r--r-- | arch/ia64/kernel/crash.c | 257 |
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); - |