2 * arch/ia64/kernel/crash.c
4 * Architecture specific (ia64) functions for kexec based crash dumps.
6 * Created by: Khalid Aziz <khalid.aziz@hp.com>
7 * Copyright (C) 2005 Hewlett-Packard Development Company, L.P.
8 * Copyright (C) 2005 Intel Corp Zou Nan hai <nanhai.zou@intel.com>
11 #include <linux/smp.h>
12 #include <linux/delay.h>
13 #include <linux/crash_dump.h>
14 #include <linux/bootmem.h>
15 #include <linux/kexec.h>
16 #include <linux/elfcore.h>
17 #include <linux/sysctl.h>
18 #include <linux/init.h>
20 #include <asm/kdebug.h>
23 int kdump_status[NR_CPUS];
24 atomic_t kdump_cpu_freezed;
25 atomic_t kdump_in_progress;
26 int kdump_on_init = 1;
28 static inline Elf64_Word
29 *append_elf_note(Elf64_Word *buf, char *name, unsigned type, void *data,
32 struct elf_note *note = (struct elf_note *)buf;
33 note->n_namesz = strlen(name) + 1;
34 note->n_descsz = data_len;
36 buf += (sizeof(*note) + 3)/4;
37 memcpy(buf, name, note->n_namesz);
38 buf += (note->n_namesz + 3)/4;
39 memcpy(buf, data, data_len);
40 buf += (data_len + 3)/4;
47 memset(buf, 0, sizeof(struct elf_note));
50 extern void ia64_dump_cpu_regs(void *);
52 static DEFINE_PER_CPU(struct elf_prstatus, elf_prstatus);
58 unsigned long cfm, sof, sol;
60 int cpu = smp_processor_id();
61 struct elf_prstatus *prstatus = &per_cpu(elf_prstatus, cpu);
63 elf_greg_t *dst = (elf_greg_t *)&(prstatus->pr_reg);
64 memset(prstatus, 0, sizeof(*prstatus));
65 prstatus->pr_pid = current->pid;
67 ia64_dump_cpu_regs(dst);
69 sol = (cfm >> 7) & 0x7f;
71 dst[46] = (unsigned long)ia64_rse_skip_regs((unsigned long *)dst[46],
74 buf = (u64 *) per_cpu_ptr(crash_notes, cpu);
77 buf = append_elf_note(buf, "CORE", NT_PRSTATUS, prstatus,
83 kdump_wait_cpu_freeze(void)
85 int cpu_num = num_online_cpus() - 1;
87 while(timeout-- > 0) {
88 if (atomic_read(&kdump_cpu_freezed) == cpu_num)
96 machine_crash_shutdown(struct pt_regs *pt)
98 /* This function is only called after the system
99 * has paniced or is otherwise in a critical state.
100 * The minimum amount of code to allow a kexec'd kernel
101 * to run successfully needs to happen here.
103 * In practice this means shooting down the other cpus in
106 kexec_disable_iosapic();
108 kdump_smp_send_stop();
109 if (kdump_wait_cpu_freeze() && kdump_on_init) {
110 //not all cpu response to IPI, send INIT to freeze them
111 kdump_smp_send_init();
117 machine_kdump_on_init(void)
120 kexec_disable_iosapic();
121 machine_kexec(ia64_kimage);
125 kdump_cpu_freeze(struct unw_frame_info *info, void *arg)
129 cpuid = smp_processor_id();
130 crash_save_this_cpu();
131 current->thread.ksp = (__u64)info->sw - 16;
132 atomic_inc(&kdump_cpu_freezed);
133 kdump_status[cpuid] = 1;
139 ia64_jump_to_sal(&sal_boot_rendez_state[cpuid]);
143 kdump_init_notifier(struct notifier_block *self, unsigned long val, void *data)
145 struct ia64_mca_notify_die *nd;
146 struct die_args *args = data;
151 if (val != DIE_INIT_MONARCH_ENTER &&
152 val != DIE_INIT_SLAVE_ENTER &&
153 val != DIE_MCA_RENDZVOUS_LEAVE &&
154 val != DIE_MCA_MONARCH_LEAVE)
157 nd = (struct ia64_mca_notify_die *)args->err;
158 /* Reason code 1 means machine check rendezous*/
159 if ((val == DIE_INIT_MONARCH_ENTER || DIE_INIT_SLAVE_ENTER) &&
164 case DIE_INIT_MONARCH_ENTER:
165 machine_kdump_on_init();
167 case DIE_INIT_SLAVE_ENTER:
168 unw_init_running(kdump_cpu_freeze, NULL);
170 case DIE_MCA_RENDZVOUS_LEAVE:
171 if (atomic_read(&kdump_in_progress))
172 unw_init_running(kdump_cpu_freeze, NULL);
174 case DIE_MCA_MONARCH_LEAVE:
175 /* die_register->signr indicate if MCA is recoverable */
177 machine_kdump_on_init();
184 static ctl_table kdump_on_init_table[] = {
186 .ctl_name = CTL_UNNUMBERED,
187 .procname = "kdump_on_init",
188 .data = &kdump_on_init,
189 .maxlen = sizeof(int),
191 .proc_handler = &proc_dointvec,
196 static ctl_table sys_table[] = {
198 .ctl_name = CTL_KERN,
199 .procname = "kernel",
201 .child = kdump_on_init_table,
208 machine_crash_setup(void)
210 static struct notifier_block kdump_init_notifier_nb = {
211 .notifier_call = kdump_init_notifier,
214 if((ret = register_die_notifier(&kdump_init_notifier_nb)) != 0)
217 register_sysctl_table(sys_table, 0);
222 __initcall(machine_crash_setup);