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a7956113 ZN |
1 | /* |
2 | * arch/ia64/kernel/crash.c | |
3 | * | |
4 | * Architecture specific (ia64) functions for kexec based crash dumps. | |
5 | * | |
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> | |
9 | * | |
10 | */ | |
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> | |
1eeb66a1 | 19 | #include <linux/kdebug.h> |
a7956113 | 20 | |
a7956113 | 21 | #include <asm/mca.h> |
a7956113 ZN |
22 | |
23 | int kdump_status[NR_CPUS]; | |
0ac1faca | 24 | static atomic_t kdump_cpu_frozen; |
a7956113 | 25 | atomic_t kdump_in_progress; |
0ac1faca | 26 | static int kdump_on_init = 1; |
a7956113 ZN |
27 | |
28 | static inline Elf64_Word | |
29 | *append_elf_note(Elf64_Word *buf, char *name, unsigned type, void *data, | |
30 | size_t data_len) | |
31 | { | |
32 | struct elf_note *note = (struct elf_note *)buf; | |
33 | note->n_namesz = strlen(name) + 1; | |
34 | note->n_descsz = data_len; | |
35 | note->n_type = type; | |
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; | |
41 | return buf; | |
42 | } | |
43 | ||
44 | static void | |
45 | final_note(void *buf) | |
46 | { | |
47 | memset(buf, 0, sizeof(struct elf_note)); | |
48 | } | |
49 | ||
50 | extern void ia64_dump_cpu_regs(void *); | |
51 | ||
52 | static DEFINE_PER_CPU(struct elf_prstatus, elf_prstatus); | |
53 | ||
54 | void | |
ccbebdac | 55 | crash_save_this_cpu(void) |
a7956113 ZN |
56 | { |
57 | void *buf; | |
58 | unsigned long cfm, sof, sol; | |
59 | ||
60 | int cpu = smp_processor_id(); | |
61 | struct elf_prstatus *prstatus = &per_cpu(elf_prstatus, cpu); | |
62 | ||
63 | elf_greg_t *dst = (elf_greg_t *)&(prstatus->pr_reg); | |
64 | memset(prstatus, 0, sizeof(*prstatus)); | |
65 | prstatus->pr_pid = current->pid; | |
66 | ||
67 | ia64_dump_cpu_regs(dst); | |
68 | cfm = dst[43]; | |
69 | sol = (cfm >> 7) & 0x7f; | |
70 | sof = cfm & 0x7f; | |
71 | dst[46] = (unsigned long)ia64_rse_skip_regs((unsigned long *)dst[46], | |
72 | sof - sol); | |
73 | ||
74 | buf = (u64 *) per_cpu_ptr(crash_notes, cpu); | |
75 | if (!buf) | |
76 | return; | |
6672f76a | 77 | buf = append_elf_note(buf, KEXEC_CORE_NOTE_NAME, NT_PRSTATUS, prstatus, |
a7956113 ZN |
78 | sizeof(*prstatus)); |
79 | final_note(buf); | |
80 | } | |
81 | ||
bcb9b99d | 82 | #ifdef CONFIG_SMP |
a7956113 ZN |
83 | static int |
84 | kdump_wait_cpu_freeze(void) | |
85 | { | |
86 | int cpu_num = num_online_cpus() - 1; | |
87 | int timeout = 1000; | |
88 | while(timeout-- > 0) { | |
0ac1faca | 89 | if (atomic_read(&kdump_cpu_frozen) == cpu_num) |
a7956113 ZN |
90 | return 0; |
91 | udelay(1000); | |
92 | } | |
93 | return 1; | |
94 | } | |
bcb9b99d | 95 | #endif |
a7956113 ZN |
96 | |
97 | void | |
98 | machine_crash_shutdown(struct pt_regs *pt) | |
99 | { | |
100 | /* This function is only called after the system | |
101 | * has paniced or is otherwise in a critical state. | |
102 | * The minimum amount of code to allow a kexec'd kernel | |
103 | * to run successfully needs to happen here. | |
104 | * | |
105 | * In practice this means shooting down the other cpus in | |
106 | * an SMP system. | |
107 | */ | |
108 | kexec_disable_iosapic(); | |
109 | #ifdef CONFIG_SMP | |
110 | kdump_smp_send_stop(); | |
0ac1faca | 111 | /* not all cpu response to IPI, send INIT to freeze them */ |
a7956113 | 112 | if (kdump_wait_cpu_freeze() && kdump_on_init) { |
a7956113 ZN |
113 | kdump_smp_send_init(); |
114 | } | |
115 | #endif | |
116 | } | |
117 | ||
118 | static void | |
119 | machine_kdump_on_init(void) | |
120 | { | |
c2c77fe8 BW |
121 | if (!ia64_kimage) { |
122 | printk(KERN_NOTICE "machine_kdump_on_init(): " | |
123 | "kdump not configured\n"); | |
124 | return; | |
125 | } | |
a7956113 ZN |
126 | local_irq_disable(); |
127 | kexec_disable_iosapic(); | |
128 | machine_kexec(ia64_kimage); | |
129 | } | |
130 | ||
131 | void | |
132 | kdump_cpu_freeze(struct unw_frame_info *info, void *arg) | |
133 | { | |
134 | int cpuid; | |
135 | local_irq_disable(); | |
136 | cpuid = smp_processor_id(); | |
137 | crash_save_this_cpu(); | |
138 | current->thread.ksp = (__u64)info->sw - 16; | |
0ac1faca | 139 | atomic_inc(&kdump_cpu_frozen); |
a7956113 ZN |
140 | kdump_status[cpuid] = 1; |
141 | mb(); | |
bcb9b99d MD |
142 | #ifdef CONFIG_HOTPLUG_CPU |
143 | if (cpuid != 0) | |
a7956113 | 144 | ia64_jump_to_sal(&sal_boot_rendez_state[cpuid]); |
bcb9b99d MD |
145 | #endif |
146 | for (;;) | |
147 | cpu_relax(); | |
a7956113 ZN |
148 | } |
149 | ||
150 | static int | |
151 | kdump_init_notifier(struct notifier_block *self, unsigned long val, void *data) | |
152 | { | |
153 | struct ia64_mca_notify_die *nd; | |
154 | struct die_args *args = data; | |
155 | ||
156 | if (!kdump_on_init) | |
157 | return NOTIFY_DONE; | |
158 | ||
159 | if (val != DIE_INIT_MONARCH_ENTER && | |
160 | val != DIE_INIT_SLAVE_ENTER && | |
161 | val != DIE_MCA_RENDZVOUS_LEAVE && | |
162 | val != DIE_MCA_MONARCH_LEAVE) | |
163 | return NOTIFY_DONE; | |
164 | ||
165 | nd = (struct ia64_mca_notify_die *)args->err; | |
166 | /* Reason code 1 means machine check rendezous*/ | |
60b548df | 167 | if ((val == DIE_INIT_MONARCH_ENTER || val == DIE_INIT_SLAVE_ENTER) && |
a7956113 ZN |
168 | nd->sos->rv_rc == 1) |
169 | return NOTIFY_DONE; | |
170 | ||
171 | switch (val) { | |
172 | case DIE_INIT_MONARCH_ENTER: | |
173 | machine_kdump_on_init(); | |
174 | break; | |
175 | case DIE_INIT_SLAVE_ENTER: | |
176 | unw_init_running(kdump_cpu_freeze, NULL); | |
177 | break; | |
178 | case DIE_MCA_RENDZVOUS_LEAVE: | |
179 | if (atomic_read(&kdump_in_progress)) | |
180 | unw_init_running(kdump_cpu_freeze, NULL); | |
181 | break; | |
182 | case DIE_MCA_MONARCH_LEAVE: | |
183 | /* die_register->signr indicate if MCA is recoverable */ | |
184 | if (!args->signr) | |
185 | machine_kdump_on_init(); | |
186 | break; | |
187 | } | |
188 | return NOTIFY_DONE; | |
189 | } | |
190 | ||
191 | #ifdef CONFIG_SYSCTL | |
192 | static ctl_table kdump_on_init_table[] = { | |
193 | { | |
194 | .ctl_name = CTL_UNNUMBERED, | |
195 | .procname = "kdump_on_init", | |
196 | .data = &kdump_on_init, | |
197 | .maxlen = sizeof(int), | |
198 | .mode = 0644, | |
199 | .proc_handler = &proc_dointvec, | |
200 | }, | |
201 | { .ctl_name = 0 } | |
202 | }; | |
203 | ||
204 | static ctl_table sys_table[] = { | |
205 | { | |
206 | .ctl_name = CTL_KERN, | |
207 | .procname = "kernel", | |
208 | .mode = 0555, | |
209 | .child = kdump_on_init_table, | |
210 | }, | |
211 | { .ctl_name = 0 } | |
212 | }; | |
213 | #endif | |
214 | ||
215 | static int | |
216 | machine_crash_setup(void) | |
217 | { | |
a7956113 ZN |
218 | static struct notifier_block kdump_init_notifier_nb = { |
219 | .notifier_call = kdump_init_notifier, | |
220 | }; | |
221 | int ret; | |
a7956113 ZN |
222 | if((ret = register_die_notifier(&kdump_init_notifier_nb)) != 0) |
223 | return ret; | |
224 | #ifdef CONFIG_SYSCTL | |
0b4d4147 | 225 | register_sysctl_table(sys_table); |
a7956113 ZN |
226 | #endif |
227 | return 0; | |
228 | } | |
229 | ||
230 | __initcall(machine_crash_setup); | |
231 |