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Linux/arch/ia64/kernel/crash.c

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  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>
 19 #include <linux/kdebug.h>
 20 
 21 #include <asm/mca.h>
 22 
 23 int kdump_status[NR_CPUS];
 24 static atomic_t kdump_cpu_frozen;
 25 atomic_t kdump_in_progress;
 26 static int kdump_freeze_monarch;
 27 static int kdump_on_init = 1;
 28 static int kdump_on_fatal_mca = 1;
 29 
 30 static inline Elf64_Word
 31 *append_elf_note(Elf64_Word *buf, char *name, unsigned type, void *data,
 32                 size_t data_len)
 33 {
 34         struct elf_note *note = (struct elf_note *)buf;
 35         note->n_namesz = strlen(name) + 1;
 36         note->n_descsz = data_len;
 37         note->n_type   = type;
 38         buf += (sizeof(*note) + 3)/4;
 39         memcpy(buf, name, note->n_namesz);
 40         buf += (note->n_namesz + 3)/4;
 41         memcpy(buf, data, data_len);
 42         buf += (data_len + 3)/4;
 43         return buf;
 44 }
 45 
 46 static void
 47 final_note(void *buf)
 48 {
 49         memset(buf, 0, sizeof(struct elf_note));
 50 }
 51 
 52 extern void ia64_dump_cpu_regs(void *);
 53 
 54 static DEFINE_PER_CPU(struct elf_prstatus, elf_prstatus);
 55 
 56 void
 57 crash_save_this_cpu(void)
 58 {
 59         void *buf;
 60         unsigned long cfm, sof, sol;
 61 
 62         int cpu = smp_processor_id();
 63         struct elf_prstatus *prstatus = &per_cpu(elf_prstatus, cpu);
 64 
 65         elf_greg_t *dst = (elf_greg_t *)&(prstatus->pr_reg);
 66         memset(prstatus, 0, sizeof(*prstatus));
 67         prstatus->pr_pid = current->pid;
 68 
 69         ia64_dump_cpu_regs(dst);
 70         cfm = dst[43];
 71         sol = (cfm >> 7) & 0x7f;
 72         sof = cfm & 0x7f;
 73         dst[46] = (unsigned long)ia64_rse_skip_regs((unsigned long *)dst[46],
 74                         sof - sol);
 75 
 76         buf = (u64 *) per_cpu_ptr(crash_notes, cpu);
 77         if (!buf)
 78                 return;
 79         buf = append_elf_note(buf, KEXEC_CORE_NOTE_NAME, NT_PRSTATUS, prstatus,
 80                         sizeof(*prstatus));
 81         final_note(buf);
 82 }
 83 
 84 #ifdef CONFIG_SMP
 85 static int
 86 kdump_wait_cpu_freeze(void)
 87 {
 88         int cpu_num = num_online_cpus() - 1;
 89         int timeout = 1000;
 90         while(timeout-- > 0) {
 91                 if (atomic_read(&kdump_cpu_frozen) == cpu_num)
 92                         return 0;
 93                 udelay(1000);
 94         }
 95         return 1;
 96 }
 97 #endif
 98 
 99 void
100 machine_crash_shutdown(struct pt_regs *pt)
101 {
102         /* This function is only called after the system
103          * has paniced or is otherwise in a critical state.
104          * The minimum amount of code to allow a kexec'd kernel
105          * to run successfully needs to happen here.
106          *
107          * In practice this means shooting down the other cpus in
108          * an SMP system.
109          */
110         kexec_disable_iosapic();
111 #ifdef CONFIG_SMP
112         /*
113          * If kdump_on_init is set and an INIT is asserted here, kdump will
114          * be started again via INIT monarch.
115          */
116         local_irq_disable();
117         ia64_set_psr_mc();      /* mask MCA/INIT */
118         if (atomic_inc_return(&kdump_in_progress) != 1)
119                 unw_init_running(kdump_cpu_freeze, NULL);
120 
121         /*
122          * Now this cpu is ready for kdump.
123          * Stop all others by IPI or INIT.  They could receive INIT from
124          * outside and might be INIT monarch, but only thing they have to
125          * do is falling into kdump_cpu_freeze().
126          *
127          * If an INIT is asserted here:
128          * - All receivers might be slaves, since some of cpus could already
129          *   be frozen and INIT might be masked on monarch.  In this case,
130          *   all slaves will be frozen soon since kdump_in_progress will let
131          *   them into DIE_INIT_SLAVE_LEAVE.
132          * - One might be a monarch, but INIT rendezvous will fail since
133          *   at least this cpu already have INIT masked so it never join
134          *   to the rendezvous.  In this case, all slaves and monarch will
135          *   be frozen soon with no wait since the INIT rendezvous is skipped
136          *   by kdump_in_progress.
137          */
138         kdump_smp_send_stop();
139         /* not all cpu response to IPI, send INIT to freeze them */
140         if (kdump_wait_cpu_freeze()) {
141                 kdump_smp_send_init();
142                 /* wait again, don't go ahead if possible */
143                 kdump_wait_cpu_freeze();
144         }
145 #endif
146 }
147 
148 static void
149 machine_kdump_on_init(void)
150 {
151         crash_save_vmcoreinfo();
152         local_irq_disable();
153         kexec_disable_iosapic();
154         machine_kexec(ia64_kimage);
155 }
156 
157 void
158 kdump_cpu_freeze(struct unw_frame_info *info, void *arg)
159 {
160         int cpuid;
161 
162         local_irq_disable();
163         cpuid = smp_processor_id();
164         crash_save_this_cpu();
165         current->thread.ksp = (__u64)info->sw - 16;
166 
167         ia64_set_psr_mc();      /* mask MCA/INIT and stop reentrance */
168 
169         atomic_inc(&kdump_cpu_frozen);
170         kdump_status[cpuid] = 1;
171         mb();
172         for (;;)
173                 cpu_relax();
174 }
175 
176 static int
177 kdump_init_notifier(struct notifier_block *self, unsigned long val, void *data)
178 {
179         struct ia64_mca_notify_die *nd;
180         struct die_args *args = data;
181 
182         if (atomic_read(&kdump_in_progress)) {
183                 switch (val) {
184                 case DIE_INIT_MONARCH_LEAVE:
185                         if (!kdump_freeze_monarch)
186                                 break;
187                         /* fall through */
188                 case DIE_INIT_SLAVE_LEAVE:
189                 case DIE_INIT_MONARCH_ENTER:
190                 case DIE_MCA_RENDZVOUS_LEAVE:
191                         unw_init_running(kdump_cpu_freeze, NULL);
192                         break;
193                 }
194         }
195 
196         if (!kdump_on_init && !kdump_on_fatal_mca)
197                 return NOTIFY_DONE;
198 
199         if (!ia64_kimage) {
200                 if (val == DIE_INIT_MONARCH_LEAVE)
201                         ia64_mca_printk(KERN_NOTICE
202                                         "%s: kdump not configured\n",
203                                         __func__);
204                 return NOTIFY_DONE;
205         }
206 
207         if (val != DIE_INIT_MONARCH_LEAVE &&
208             val != DIE_INIT_MONARCH_PROCESS &&
209             val != DIE_MCA_MONARCH_LEAVE)
210                 return NOTIFY_DONE;
211 
212         nd = (struct ia64_mca_notify_die *)args->err;
213 
214         switch (val) {
215         case DIE_INIT_MONARCH_PROCESS:
216                 /* Reason code 1 means machine check rendezvous*/
217                 if (kdump_on_init && (nd->sos->rv_rc != 1)) {
218                         if (atomic_inc_return(&kdump_in_progress) != 1)
219                                 kdump_freeze_monarch = 1;
220                 }
221                 break;
222         case DIE_INIT_MONARCH_LEAVE:
223                 /* Reason code 1 means machine check rendezvous*/
224                 if (kdump_on_init && (nd->sos->rv_rc != 1))
225                         machine_kdump_on_init();
226                 break;
227         case DIE_MCA_MONARCH_LEAVE:
228                 /* *(nd->data) indicate if MCA is recoverable */
229                 if (kdump_on_fatal_mca && !(*(nd->data))) {
230                         if (atomic_inc_return(&kdump_in_progress) == 1)
231                                 machine_kdump_on_init();
232                         /* We got fatal MCA while kdump!? No way!! */
233                 }
234                 break;
235         }
236         return NOTIFY_DONE;
237 }
238 
239 #ifdef CONFIG_SYSCTL
240 static struct ctl_table kdump_ctl_table[] = {
241         {
242                 .procname = "kdump_on_init",
243                 .data = &kdump_on_init,
244                 .maxlen = sizeof(int),
245                 .mode = 0644,
246                 .proc_handler = proc_dointvec,
247         },
248         {
249                 .procname = "kdump_on_fatal_mca",
250                 .data = &kdump_on_fatal_mca,
251                 .maxlen = sizeof(int),
252                 .mode = 0644,
253                 .proc_handler = proc_dointvec,
254         },
255         { }
256 };
257 
258 static struct ctl_table sys_table[] = {
259         {
260           .procname = "kernel",
261           .mode = 0555,
262           .child = kdump_ctl_table,
263         },
264         { }
265 };
266 #endif
267 
268 static int
269 machine_crash_setup(void)
270 {
271         /* be notified before default_monarch_init_process */
272         static struct notifier_block kdump_init_notifier_nb = {
273                 .notifier_call = kdump_init_notifier,
274                 .priority = 1,
275         };
276         int ret;
277         if((ret = register_die_notifier(&kdump_init_notifier_nb)) != 0)
278                 return ret;
279 #ifdef CONFIG_SYSCTL
280         register_sysctl_table(sys_table);
281 #endif
282         return 0;
283 }
284 
285 __initcall(machine_crash_setup);
286 
287 

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