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Linux/arch/powerpc/platforms/pseries/ras.c

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  1 /*
  2  * Copyright (C) 2001 Dave Engebretsen IBM Corporation
  3  *
  4  * This program is free software; you can redistribute it and/or modify
  5  * it under the terms of the GNU General Public License as published by
  6  * the Free Software Foundation; either version 2 of the License, or
  7  * (at your option) any later version.
  8  *
  9  * This program is distributed in the hope that it will be useful,
 10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 12  * GNU General Public License for more details.
 13  *
 14  * You should have received a copy of the GNU General Public License
 15  * along with this program; if not, write to the Free Software
 16  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 17  */
 18 
 19 #include <linux/sched.h>
 20 #include <linux/interrupt.h>
 21 #include <linux/irq.h>
 22 #include <linux/of.h>
 23 #include <linux/fs.h>
 24 #include <linux/reboot.h>
 25 
 26 #include <asm/machdep.h>
 27 #include <asm/rtas.h>
 28 #include <asm/firmware.h>
 29 
 30 #include "pseries.h"
 31 
 32 static unsigned char ras_log_buf[RTAS_ERROR_LOG_MAX];
 33 static DEFINE_SPINLOCK(ras_log_buf_lock);
 34 
 35 static char global_mce_data_buf[RTAS_ERROR_LOG_MAX];
 36 static DEFINE_PER_CPU(__u64, mce_data_buf);
 37 
 38 static int ras_check_exception_token;
 39 
 40 #define EPOW_SENSOR_TOKEN       9
 41 #define EPOW_SENSOR_INDEX       0
 42 
 43 static irqreturn_t ras_epow_interrupt(int irq, void *dev_id);
 44 static irqreturn_t ras_error_interrupt(int irq, void *dev_id);
 45 
 46 
 47 /*
 48  * Initialize handlers for the set of interrupts caused by hardware errors
 49  * and power system events.
 50  */
 51 static int __init init_ras_IRQ(void)
 52 {
 53         struct device_node *np;
 54 
 55         ras_check_exception_token = rtas_token("check-exception");
 56 
 57         /* Internal Errors */
 58         np = of_find_node_by_path("/event-sources/internal-errors");
 59         if (np != NULL) {
 60                 request_event_sources_irqs(np, ras_error_interrupt,
 61                                            "RAS_ERROR");
 62                 of_node_put(np);
 63         }
 64 
 65         /* EPOW Events */
 66         np = of_find_node_by_path("/event-sources/epow-events");
 67         if (np != NULL) {
 68                 request_event_sources_irqs(np, ras_epow_interrupt, "RAS_EPOW");
 69                 of_node_put(np);
 70         }
 71 
 72         return 0;
 73 }
 74 subsys_initcall(init_ras_IRQ);
 75 
 76 #define EPOW_SHUTDOWN_NORMAL                            1
 77 #define EPOW_SHUTDOWN_ON_UPS                            2
 78 #define EPOW_SHUTDOWN_LOSS_OF_CRITICAL_FUNCTIONS        3
 79 #define EPOW_SHUTDOWN_AMBIENT_TEMPERATURE_TOO_HIGH      4
 80 
 81 static void handle_system_shutdown(char event_modifier)
 82 {
 83         switch (event_modifier) {
 84         case EPOW_SHUTDOWN_NORMAL:
 85                 pr_emerg("Firmware initiated power off");
 86                 orderly_poweroff(1);
 87                 break;
 88 
 89         case EPOW_SHUTDOWN_ON_UPS:
 90                 pr_emerg("Loss of power reported by firmware, system is "
 91                         "running on UPS/battery");
 92                 break;
 93 
 94         case EPOW_SHUTDOWN_LOSS_OF_CRITICAL_FUNCTIONS:
 95                 pr_emerg("Loss of system critical functions reported by "
 96                         "firmware");
 97                 pr_emerg("Check RTAS error log for details");
 98                 orderly_poweroff(1);
 99                 break;
100 
101         case EPOW_SHUTDOWN_AMBIENT_TEMPERATURE_TOO_HIGH:
102                 pr_emerg("Ambient temperature too high reported by firmware");
103                 pr_emerg("Check RTAS error log for details");
104                 orderly_poweroff(1);
105                 break;
106 
107         default:
108                 pr_err("Unknown power/cooling shutdown event (modifier %d)",
109                         event_modifier);
110         }
111 }
112 
113 struct epow_errorlog {
114         unsigned char sensor_value;
115         unsigned char event_modifier;
116         unsigned char extended_modifier;
117         unsigned char reserved;
118         unsigned char platform_reason;
119 };
120 
121 #define EPOW_RESET                      0
122 #define EPOW_WARN_COOLING               1
123 #define EPOW_WARN_POWER                 2
124 #define EPOW_SYSTEM_SHUTDOWN            3
125 #define EPOW_SYSTEM_HALT                4
126 #define EPOW_MAIN_ENCLOSURE             5
127 #define EPOW_POWER_OFF                  7
128 
129 void rtas_parse_epow_errlog(struct rtas_error_log *log)
130 {
131         struct pseries_errorlog *pseries_log;
132         struct epow_errorlog *epow_log;
133         char action_code;
134         char modifier;
135 
136         pseries_log = get_pseries_errorlog(log, PSERIES_ELOG_SECT_ID_EPOW);
137         if (pseries_log == NULL)
138                 return;
139 
140         epow_log = (struct epow_errorlog *)pseries_log->data;
141         action_code = epow_log->sensor_value & 0xF;     /* bottom 4 bits */
142         modifier = epow_log->event_modifier & 0xF;      /* bottom 4 bits */
143 
144         switch (action_code) {
145         case EPOW_RESET:
146                 pr_err("Non critical power or cooling issue cleared");
147                 break;
148 
149         case EPOW_WARN_COOLING:
150                 pr_err("Non critical cooling issue reported by firmware");
151                 pr_err("Check RTAS error log for details");
152                 break;
153 
154         case EPOW_WARN_POWER:
155                 pr_err("Non critical power issue reported by firmware");
156                 pr_err("Check RTAS error log for details");
157                 break;
158 
159         case EPOW_SYSTEM_SHUTDOWN:
160                 handle_system_shutdown(epow_log->event_modifier);
161                 break;
162 
163         case EPOW_SYSTEM_HALT:
164                 pr_emerg("Firmware initiated power off");
165                 orderly_poweroff(1);
166                 break;
167 
168         case EPOW_MAIN_ENCLOSURE:
169         case EPOW_POWER_OFF:
170                 pr_emerg("Critical power/cooling issue reported by firmware");
171                 pr_emerg("Check RTAS error log for details");
172                 pr_emerg("Immediate power off");
173                 emergency_sync();
174                 kernel_power_off();
175                 break;
176 
177         default:
178                 pr_err("Unknown power/cooling event (action code %d)",
179                         action_code);
180         }
181 }
182 
183 /* Handle environmental and power warning (EPOW) interrupts. */
184 static irqreturn_t ras_epow_interrupt(int irq, void *dev_id)
185 {
186         int status;
187         int state;
188         int critical;
189 
190         status = rtas_get_sensor(EPOW_SENSOR_TOKEN, EPOW_SENSOR_INDEX, &state);
191 
192         if (state > 3)
193                 critical = 1;           /* Time Critical */
194         else
195                 critical = 0;
196 
197         spin_lock(&ras_log_buf_lock);
198 
199         status = rtas_call(ras_check_exception_token, 6, 1, NULL,
200                            RTAS_VECTOR_EXTERNAL_INTERRUPT,
201                            virq_to_hw(irq),
202                            RTAS_EPOW_WARNING,
203                            critical, __pa(&ras_log_buf),
204                                 rtas_get_error_log_max());
205 
206         log_error(ras_log_buf, ERR_TYPE_RTAS_LOG, 0);
207 
208         rtas_parse_epow_errlog((struct rtas_error_log *)ras_log_buf);
209 
210         spin_unlock(&ras_log_buf_lock);
211         return IRQ_HANDLED;
212 }
213 
214 /*
215  * Handle hardware error interrupts.
216  *
217  * RTAS check-exception is called to collect data on the exception.  If
218  * the error is deemed recoverable, we log a warning and return.
219  * For nonrecoverable errors, an error is logged and we stop all processing
220  * as quickly as possible in order to prevent propagation of the failure.
221  */
222 static irqreturn_t ras_error_interrupt(int irq, void *dev_id)
223 {
224         struct rtas_error_log *rtas_elog;
225         int status;
226         int fatal;
227 
228         spin_lock(&ras_log_buf_lock);
229 
230         status = rtas_call(ras_check_exception_token, 6, 1, NULL,
231                            RTAS_VECTOR_EXTERNAL_INTERRUPT,
232                            virq_to_hw(irq),
233                            RTAS_INTERNAL_ERROR, 1 /* Time Critical */,
234                            __pa(&ras_log_buf),
235                                 rtas_get_error_log_max());
236 
237         rtas_elog = (struct rtas_error_log *)ras_log_buf;
238 
239         if ((status == 0) && (rtas_elog->severity >= RTAS_SEVERITY_ERROR_SYNC))
240                 fatal = 1;
241         else
242                 fatal = 0;
243 
244         /* format and print the extended information */
245         log_error(ras_log_buf, ERR_TYPE_RTAS_LOG, fatal);
246 
247         if (fatal) {
248                 pr_emerg("Fatal hardware error reported by firmware");
249                 pr_emerg("Check RTAS error log for details");
250                 pr_emerg("Immediate power off");
251                 emergency_sync();
252                 kernel_power_off();
253         } else {
254                 pr_err("Recoverable hardware error reported by firmware");
255         }
256 
257         spin_unlock(&ras_log_buf_lock);
258         return IRQ_HANDLED;
259 }
260 
261 /*
262  * Some versions of FWNMI place the buffer inside the 4kB page starting at
263  * 0x7000. Other versions place it inside the rtas buffer. We check both.
264  */
265 #define VALID_FWNMI_BUFFER(A) \
266         ((((A) >= 0x7000) && ((A) < 0x7ff0)) || \
267         (((A) >= rtas.base) && ((A) < (rtas.base + rtas.size - 16))))
268 
269 /*
270  * Get the error information for errors coming through the
271  * FWNMI vectors.  The pt_regs' r3 will be updated to reflect
272  * the actual r3 if possible, and a ptr to the error log entry
273  * will be returned if found.
274  *
275  * If the RTAS error is not of the extended type, then we put it in a per
276  * cpu 64bit buffer. If it is the extended type we use global_mce_data_buf.
277  *
278  * The global_mce_data_buf does not have any locks or protection around it,
279  * if a second machine check comes in, or a system reset is done
280  * before we have logged the error, then we will get corruption in the
281  * error log.  This is preferable over holding off on calling
282  * ibm,nmi-interlock which would result in us checkstopping if a
283  * second machine check did come in.
284  */
285 static struct rtas_error_log *fwnmi_get_errinfo(struct pt_regs *regs)
286 {
287         unsigned long *savep;
288         struct rtas_error_log *h, *errhdr = NULL;
289 
290         if (!VALID_FWNMI_BUFFER(regs->gpr[3])) {
291                 printk(KERN_ERR "FWNMI: corrupt r3 0x%016lx\n", regs->gpr[3]);
292                 return NULL;
293         }
294 
295         savep = __va(regs->gpr[3]);
296         regs->gpr[3] = savep[0];        /* restore original r3 */
297 
298         /* If it isn't an extended log we can use the per cpu 64bit buffer */
299         h = (struct rtas_error_log *)&savep[1];
300         if (!h->extended) {
301                 memcpy(&__get_cpu_var(mce_data_buf), h, sizeof(__u64));
302                 errhdr = (struct rtas_error_log *)&__get_cpu_var(mce_data_buf);
303         } else {
304                 int len;
305 
306                 len = max_t(int, 8+h->extended_log_length, RTAS_ERROR_LOG_MAX);
307                 memset(global_mce_data_buf, 0, RTAS_ERROR_LOG_MAX);
308                 memcpy(global_mce_data_buf, h, len);
309                 errhdr = (struct rtas_error_log *)global_mce_data_buf;
310         }
311 
312         return errhdr;
313 }
314 
315 /* Call this when done with the data returned by FWNMI_get_errinfo.
316  * It will release the saved data area for other CPUs in the
317  * partition to receive FWNMI errors.
318  */
319 static void fwnmi_release_errinfo(void)
320 {
321         int ret = rtas_call(rtas_token("ibm,nmi-interlock"), 0, 1, NULL);
322         if (ret != 0)
323                 printk(KERN_ERR "FWNMI: nmi-interlock failed: %d\n", ret);
324 }
325 
326 int pSeries_system_reset_exception(struct pt_regs *regs)
327 {
328         if (fwnmi_active) {
329                 struct rtas_error_log *errhdr = fwnmi_get_errinfo(regs);
330                 if (errhdr) {
331                         /* XXX Should look at FWNMI information */
332                 }
333                 fwnmi_release_errinfo();
334         }
335         return 0; /* need to perform reset */
336 }
337 
338 /*
339  * See if we can recover from a machine check exception.
340  * This is only called on power4 (or above) and only via
341  * the Firmware Non-Maskable Interrupts (fwnmi) handler
342  * which provides the error analysis for us.
343  *
344  * Return 1 if corrected (or delivered a signal).
345  * Return 0 if there is nothing we can do.
346  */
347 static int recover_mce(struct pt_regs *regs, struct rtas_error_log *err)
348 {
349         int recovered = 0;
350 
351         if (!(regs->msr & MSR_RI)) {
352                 /* If MSR_RI isn't set, we cannot recover */
353                 recovered = 0;
354 
355         } else if (err->disposition == RTAS_DISP_FULLY_RECOVERED) {
356                 /* Platform corrected itself */
357                 recovered = 1;
358 
359         } else if (err->disposition == RTAS_DISP_LIMITED_RECOVERY) {
360                 /* Platform corrected itself but could be degraded */
361                 printk(KERN_ERR "MCE: limited recovery, system may "
362                        "be degraded\n");
363                 recovered = 1;
364 
365         } else if (user_mode(regs) && !is_global_init(current) &&
366                    err->severity == RTAS_SEVERITY_ERROR_SYNC) {
367 
368                 /*
369                  * If we received a synchronous error when in userspace
370                  * kill the task. Firmware may report details of the fail
371                  * asynchronously, so we can't rely on the target and type
372                  * fields being valid here.
373                  */
374                 printk(KERN_ERR "MCE: uncorrectable error, killing task "
375                        "%s:%d\n", current->comm, current->pid);
376 
377                 _exception(SIGBUS, regs, BUS_MCEERR_AR, regs->nip);
378                 recovered = 1;
379         }
380 
381         log_error((char *)err, ERR_TYPE_RTAS_LOG, 0);
382 
383         return recovered;
384 }
385 
386 /*
387  * Handle a machine check.
388  *
389  * Note that on Power 4 and beyond Firmware Non-Maskable Interrupts (fwnmi)
390  * should be present.  If so the handler which called us tells us if the
391  * error was recovered (never true if RI=0).
392  *
393  * On hardware prior to Power 4 these exceptions were asynchronous which
394  * means we can't tell exactly where it occurred and so we can't recover.
395  */
396 int pSeries_machine_check_exception(struct pt_regs *regs)
397 {
398         struct rtas_error_log *errp;
399 
400         if (fwnmi_active) {
401                 errp = fwnmi_get_errinfo(regs);
402                 fwnmi_release_errinfo();
403                 if (errp && recover_mce(regs, errp))
404                         return 1;
405         }
406 
407         return 0;
408 }
409 

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