Commit | Line | Data |
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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; |
b0247a55 | 27 | static int kdump_on_fatal_mca = 1; |
a7956113 ZN |
28 | |
29 | static inline Elf64_Word | |
30 | *append_elf_note(Elf64_Word *buf, char *name, unsigned type, void *data, | |
31 | size_t data_len) | |
32 | { | |
33 | struct elf_note *note = (struct elf_note *)buf; | |
34 | note->n_namesz = strlen(name) + 1; | |
35 | note->n_descsz = data_len; | |
36 | note->n_type = type; | |
37 | buf += (sizeof(*note) + 3)/4; | |
38 | memcpy(buf, name, note->n_namesz); | |
39 | buf += (note->n_namesz + 3)/4; | |
40 | memcpy(buf, data, data_len); | |
41 | buf += (data_len + 3)/4; | |
42 | return buf; | |
43 | } | |
44 | ||
45 | static void | |
46 | final_note(void *buf) | |
47 | { | |
48 | memset(buf, 0, sizeof(struct elf_note)); | |
49 | } | |
50 | ||
51 | extern void ia64_dump_cpu_regs(void *); | |
52 | ||
53 | static DEFINE_PER_CPU(struct elf_prstatus, elf_prstatus); | |
54 | ||
55 | void | |
ccbebdac | 56 | crash_save_this_cpu(void) |
a7956113 ZN |
57 | { |
58 | void *buf; | |
59 | unsigned long cfm, sof, sol; | |
60 | ||
61 | int cpu = smp_processor_id(); | |
62 | struct elf_prstatus *prstatus = &per_cpu(elf_prstatus, cpu); | |
63 | ||
64 | elf_greg_t *dst = (elf_greg_t *)&(prstatus->pr_reg); | |
65 | memset(prstatus, 0, sizeof(*prstatus)); | |
66 | prstatus->pr_pid = current->pid; | |
67 | ||
68 | ia64_dump_cpu_regs(dst); | |
69 | cfm = dst[43]; | |
70 | sol = (cfm >> 7) & 0x7f; | |
71 | sof = cfm & 0x7f; | |
72 | dst[46] = (unsigned long)ia64_rse_skip_regs((unsigned long *)dst[46], | |
73 | sof - sol); | |
74 | ||
75 | buf = (u64 *) per_cpu_ptr(crash_notes, cpu); | |
76 | if (!buf) | |
77 | return; | |
6672f76a | 78 | buf = append_elf_note(buf, KEXEC_CORE_NOTE_NAME, NT_PRSTATUS, prstatus, |
a7956113 ZN |
79 | sizeof(*prstatus)); |
80 | final_note(buf); | |
81 | } | |
82 | ||
bcb9b99d | 83 | #ifdef CONFIG_SMP |
a7956113 ZN |
84 | static int |
85 | kdump_wait_cpu_freeze(void) | |
86 | { | |
87 | int cpu_num = num_online_cpus() - 1; | |
88 | int timeout = 1000; | |
89 | while(timeout-- > 0) { | |
0ac1faca | 90 | if (atomic_read(&kdump_cpu_frozen) == cpu_num) |
a7956113 ZN |
91 | return 0; |
92 | udelay(1000); | |
93 | } | |
94 | return 1; | |
95 | } | |
bcb9b99d | 96 | #endif |
a7956113 ZN |
97 | |
98 | void | |
99 | machine_crash_shutdown(struct pt_regs *pt) | |
100 | { | |
101 | /* This function is only called after the system | |
102 | * has paniced or is otherwise in a critical state. | |
103 | * The minimum amount of code to allow a kexec'd kernel | |
104 | * to run successfully needs to happen here. | |
105 | * | |
106 | * In practice this means shooting down the other cpus in | |
107 | * an SMP system. | |
108 | */ | |
109 | kexec_disable_iosapic(); | |
110 | #ifdef CONFIG_SMP | |
111 | kdump_smp_send_stop(); | |
0ac1faca | 112 | /* not all cpu response to IPI, send INIT to freeze them */ |
a7956113 | 113 | if (kdump_wait_cpu_freeze() && kdump_on_init) { |
a7956113 ZN |
114 | kdump_smp_send_init(); |
115 | } | |
116 | #endif | |
117 | } | |
118 | ||
119 | static void | |
120 | machine_kdump_on_init(void) | |
121 | { | |
072f042d | 122 | crash_save_vmcoreinfo(); |
a7956113 ZN |
123 | local_irq_disable(); |
124 | kexec_disable_iosapic(); | |
125 | machine_kexec(ia64_kimage); | |
126 | } | |
127 | ||
128 | void | |
129 | kdump_cpu_freeze(struct unw_frame_info *info, void *arg) | |
130 | { | |
131 | int cpuid; | |
132 | local_irq_disable(); | |
133 | cpuid = smp_processor_id(); | |
134 | crash_save_this_cpu(); | |
135 | current->thread.ksp = (__u64)info->sw - 16; | |
0ac1faca | 136 | atomic_inc(&kdump_cpu_frozen); |
a7956113 ZN |
137 | kdump_status[cpuid] = 1; |
138 | mb(); | |
bcb9b99d MD |
139 | #ifdef CONFIG_HOTPLUG_CPU |
140 | if (cpuid != 0) | |
a7956113 | 141 | ia64_jump_to_sal(&sal_boot_rendez_state[cpuid]); |
bcb9b99d MD |
142 | #endif |
143 | for (;;) | |
144 | cpu_relax(); | |
a7956113 ZN |
145 | } |
146 | ||
147 | static int | |
148 | kdump_init_notifier(struct notifier_block *self, unsigned long val, void *data) | |
149 | { | |
150 | struct ia64_mca_notify_die *nd; | |
151 | struct die_args *args = data; | |
152 | ||
b0247a55 | 153 | if (!kdump_on_init && !kdump_on_fatal_mca) |
a7956113 ZN |
154 | return NOTIFY_DONE; |
155 | ||
2010d7fe KK |
156 | if (!ia64_kimage) { |
157 | if (val == DIE_INIT_MONARCH_LEAVE) | |
158 | ia64_mca_printk(KERN_NOTICE | |
159 | "%s: kdump not configured\n", | |
d4ed8084 | 160 | __func__); |
2010d7fe KK |
161 | return NOTIFY_DONE; |
162 | } | |
163 | ||
311f594d JL |
164 | if (val != DIE_INIT_MONARCH_LEAVE && |
165 | val != DIE_INIT_SLAVE_LEAVE && | |
166 | val != DIE_INIT_MONARCH_PROCESS && | |
a7956113 ZN |
167 | val != DIE_MCA_RENDZVOUS_LEAVE && |
168 | val != DIE_MCA_MONARCH_LEAVE) | |
169 | return NOTIFY_DONE; | |
170 | ||
171 | nd = (struct ia64_mca_notify_die *)args->err; | |
72fdbdce | 172 | /* Reason code 1 means machine check rendezvous*/ |
311f594d JL |
173 | if ((val == DIE_INIT_MONARCH_LEAVE || val == DIE_INIT_SLAVE_LEAVE |
174 | || val == DIE_INIT_MONARCH_PROCESS) && nd->sos->rv_rc == 1) | |
a7956113 ZN |
175 | return NOTIFY_DONE; |
176 | ||
177 | switch (val) { | |
3975afff HS |
178 | case DIE_INIT_MONARCH_PROCESS: |
179 | if (kdump_on_init) { | |
180 | atomic_set(&kdump_in_progress, 1); | |
181 | *(nd->monarch_cpu) = -1; | |
182 | } | |
183 | break; | |
184 | case DIE_INIT_MONARCH_LEAVE: | |
185 | if (kdump_on_init) | |
186 | machine_kdump_on_init(); | |
187 | break; | |
188 | case DIE_INIT_SLAVE_LEAVE: | |
189 | if (atomic_read(&kdump_in_progress)) | |
190 | unw_init_running(kdump_cpu_freeze, NULL); | |
191 | break; | |
192 | case DIE_MCA_RENDZVOUS_LEAVE: | |
193 | if (atomic_read(&kdump_in_progress)) | |
194 | unw_init_running(kdump_cpu_freeze, NULL); | |
195 | break; | |
196 | case DIE_MCA_MONARCH_LEAVE: | |
4fa2f0e6 HS |
197 | /* *(nd->data) indicate if MCA is recoverable */ |
198 | if (kdump_on_fatal_mca && !(*(nd->data))) { | |
3975afff HS |
199 | atomic_set(&kdump_in_progress, 1); |
200 | *(nd->monarch_cpu) = -1; | |
201 | machine_kdump_on_init(); | |
202 | } | |
203 | break; | |
a7956113 ZN |
204 | } |
205 | return NOTIFY_DONE; | |
206 | } | |
207 | ||
208 | #ifdef CONFIG_SYSCTL | |
b0247a55 | 209 | static ctl_table kdump_ctl_table[] = { |
a7956113 ZN |
210 | { |
211 | .ctl_name = CTL_UNNUMBERED, | |
212 | .procname = "kdump_on_init", | |
213 | .data = &kdump_on_init, | |
214 | .maxlen = sizeof(int), | |
215 | .mode = 0644, | |
216 | .proc_handler = &proc_dointvec, | |
217 | }, | |
b0247a55 HS |
218 | { |
219 | .ctl_name = CTL_UNNUMBERED, | |
220 | .procname = "kdump_on_fatal_mca", | |
221 | .data = &kdump_on_fatal_mca, | |
222 | .maxlen = sizeof(int), | |
223 | .mode = 0644, | |
224 | .proc_handler = &proc_dointvec, | |
225 | }, | |
a7956113 ZN |
226 | { .ctl_name = 0 } |
227 | }; | |
228 | ||
229 | static ctl_table sys_table[] = { | |
230 | { | |
231 | .ctl_name = CTL_KERN, | |
232 | .procname = "kernel", | |
233 | .mode = 0555, | |
b0247a55 | 234 | .child = kdump_ctl_table, |
a7956113 ZN |
235 | }, |
236 | { .ctl_name = 0 } | |
237 | }; | |
238 | #endif | |
239 | ||
240 | static int | |
241 | machine_crash_setup(void) | |
242 | { | |
311f594d | 243 | /* be notified before default_monarch_init_process */ |
a7956113 ZN |
244 | static struct notifier_block kdump_init_notifier_nb = { |
245 | .notifier_call = kdump_init_notifier, | |
311f594d | 246 | .priority = 1, |
a7956113 ZN |
247 | }; |
248 | int ret; | |
a7956113 ZN |
249 | if((ret = register_die_notifier(&kdump_init_notifier_nb)) != 0) |
250 | return ret; | |
251 | #ifdef CONFIG_SYSCTL | |
0b4d4147 | 252 | register_sysctl_table(sys_table); |
a7956113 ZN |
253 | #endif |
254 | return 0; | |
255 | } | |
256 | ||
257 | __initcall(machine_crash_setup); | |
258 |