Commit | Line | Data |
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1da177e4 | 1 | /* |
1da177e4 | 2 | * Copyright (C) 2001 Dave Engebretsen IBM Corporation |
d9953105 | 3 | * |
1da177e4 LT |
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. | |
d9953105 | 8 | * |
1da177e4 LT |
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. | |
d9953105 | 13 | * |
1da177e4 LT |
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 | /* Change Activity: | |
20 | * 2001/09/21 : engebret : Created with minimal EPOW and HW exception support. | |
d9953105 | 21 | * End Change Activity |
1da177e4 LT |
22 | */ |
23 | ||
24 | #include <linux/errno.h> | |
25 | #include <linux/threads.h> | |
26 | #include <linux/kernel_stat.h> | |
27 | #include <linux/signal.h> | |
28 | #include <linux/sched.h> | |
29 | #include <linux/ioport.h> | |
30 | #include <linux/interrupt.h> | |
31 | #include <linux/timex.h> | |
32 | #include <linux/init.h> | |
33 | #include <linux/slab.h> | |
1da177e4 LT |
34 | #include <linux/delay.h> |
35 | #include <linux/irq.h> | |
36 | #include <linux/random.h> | |
37 | #include <linux/sysrq.h> | |
38 | #include <linux/bitops.h> | |
39 | ||
40 | #include <asm/uaccess.h> | |
41 | #include <asm/system.h> | |
42 | #include <asm/io.h> | |
43 | #include <asm/pgtable.h> | |
44 | #include <asm/irq.h> | |
45 | #include <asm/cache.h> | |
46 | #include <asm/prom.h> | |
47 | #include <asm/ptrace.h> | |
1da177e4 LT |
48 | #include <asm/machdep.h> |
49 | #include <asm/rtas.h> | |
dcad47fc | 50 | #include <asm/udbg.h> |
8c4f1f29 | 51 | #include <asm/firmware.h> |
1da177e4 | 52 | |
577830b0 | 53 | #include "pseries.h" |
c902be71 | 54 | |
1da177e4 LT |
55 | static unsigned char ras_log_buf[RTAS_ERROR_LOG_MAX]; |
56 | static DEFINE_SPINLOCK(ras_log_buf_lock); | |
57 | ||
8c4f1f29 | 58 | char mce_data_buf[RTAS_ERROR_LOG_MAX]; |
1da177e4 | 59 | |
1da177e4 LT |
60 | static int ras_get_sensor_state_token; |
61 | static int ras_check_exception_token; | |
62 | ||
63 | #define EPOW_SENSOR_TOKEN 9 | |
64 | #define EPOW_SENSOR_INDEX 0 | |
65 | #define RAS_VECTOR_OFFSET 0x500 | |
66 | ||
7d12e780 DH |
67 | static irqreturn_t ras_epow_interrupt(int irq, void *dev_id); |
68 | static irqreturn_t ras_error_interrupt(int irq, void *dev_id); | |
1da177e4 LT |
69 | |
70 | /* #define DEBUG */ | |
71 | ||
0ebfff14 BH |
72 | |
73 | static void request_ras_irqs(struct device_node *np, | |
7d12e780 | 74 | irq_handler_t handler, |
1da177e4 LT |
75 | const char *name) |
76 | { | |
0ebfff14 BH |
77 | int i, index, count = 0; |
78 | struct of_irq oirq; | |
954a46e2 | 79 | const u32 *opicprop; |
0ebfff14 BH |
80 | unsigned int opicplen; |
81 | unsigned int virqs[16]; | |
82 | ||
83 | /* Check for obsolete "open-pic-interrupt" property. If present, then | |
84 | * map those interrupts using the default interrupt host and default | |
85 | * trigger | |
86 | */ | |
e2eb6392 | 87 | opicprop = of_get_property(np, "open-pic-interrupt", &opicplen); |
0ebfff14 BH |
88 | if (opicprop) { |
89 | opicplen /= sizeof(u32); | |
90 | for (i = 0; i < opicplen; i++) { | |
91 | if (count > 15) | |
92 | break; | |
6e99e458 | 93 | virqs[count] = irq_create_mapping(NULL, *(opicprop++)); |
0ebfff14 BH |
94 | if (virqs[count] == NO_IRQ) |
95 | printk(KERN_ERR "Unable to allocate interrupt " | |
96 | "number for %s\n", np->full_name); | |
97 | else | |
98 | count++; | |
99 | ||
1da177e4 | 100 | } |
0ebfff14 BH |
101 | } |
102 | /* Else use normal interrupt tree parsing */ | |
103 | else { | |
104 | /* First try to do a proper OF tree parsing */ | |
105 | for (index = 0; of_irq_map_one(np, index, &oirq) == 0; | |
106 | index++) { | |
107 | if (count > 15) | |
108 | break; | |
109 | virqs[count] = irq_create_of_mapping(oirq.controller, | |
110 | oirq.specifier, | |
111 | oirq.size); | |
112 | if (virqs[count] == NO_IRQ) | |
113 | printk(KERN_ERR "Unable to allocate interrupt " | |
114 | "number for %s\n", np->full_name); | |
115 | else | |
116 | count++; | |
117 | } | |
118 | } | |
119 | ||
120 | /* Now request them */ | |
121 | for (i = 0; i < count; i++) { | |
122 | if (request_irq(virqs[i], handler, 0, name, NULL)) { | |
1da177e4 | 123 | printk(KERN_ERR "Unable to request interrupt %d for " |
0ebfff14 | 124 | "%s\n", virqs[i], np->full_name); |
1da177e4 LT |
125 | return; |
126 | } | |
1da177e4 LT |
127 | } |
128 | } | |
129 | ||
130 | /* | |
131 | * Initialize handlers for the set of interrupts caused by hardware errors | |
132 | * and power system events. | |
133 | */ | |
134 | static int __init init_ras_IRQ(void) | |
135 | { | |
136 | struct device_node *np; | |
137 | ||
138 | ras_get_sensor_state_token = rtas_token("get-sensor-state"); | |
139 | ras_check_exception_token = rtas_token("check-exception"); | |
140 | ||
141 | /* Internal Errors */ | |
142 | np = of_find_node_by_path("/event-sources/internal-errors"); | |
143 | if (np != NULL) { | |
0ebfff14 | 144 | request_ras_irqs(np, ras_error_interrupt, "RAS_ERROR"); |
1da177e4 LT |
145 | of_node_put(np); |
146 | } | |
147 | ||
148 | /* EPOW Events */ | |
149 | np = of_find_node_by_path("/event-sources/epow-events"); | |
150 | if (np != NULL) { | |
0ebfff14 | 151 | request_ras_irqs(np, ras_epow_interrupt, "RAS_EPOW"); |
1da177e4 LT |
152 | of_node_put(np); |
153 | } | |
154 | ||
69ed3324 | 155 | return 0; |
1da177e4 LT |
156 | } |
157 | __initcall(init_ras_IRQ); | |
158 | ||
159 | /* | |
160 | * Handle power subsystem events (EPOW). | |
161 | * | |
162 | * Presently we just log the event has occurred. This should be fixed | |
163 | * to examine the type of power failure and take appropriate action where | |
164 | * the time horizon permits something useful to be done. | |
165 | */ | |
7d12e780 | 166 | static irqreturn_t ras_epow_interrupt(int irq, void *dev_id) |
1da177e4 LT |
167 | { |
168 | int status = 0xdeadbeef; | |
169 | int state = 0; | |
170 | int critical; | |
171 | ||
172 | status = rtas_call(ras_get_sensor_state_token, 2, 2, &state, | |
173 | EPOW_SENSOR_TOKEN, EPOW_SENSOR_INDEX); | |
174 | ||
175 | if (state > 3) | |
176 | critical = 1; /* Time Critical */ | |
177 | else | |
178 | critical = 0; | |
179 | ||
180 | spin_lock(&ras_log_buf_lock); | |
181 | ||
182 | status = rtas_call(ras_check_exception_token, 6, 1, NULL, | |
183 | RAS_VECTOR_OFFSET, | |
0ebfff14 | 184 | irq_map[irq].hwirq, |
1da177e4 LT |
185 | RTAS_EPOW_WARNING | RTAS_POWERMGM_EVENTS, |
186 | critical, __pa(&ras_log_buf), | |
187 | rtas_get_error_log_max()); | |
188 | ||
189 | udbg_printf("EPOW <0x%lx 0x%x 0x%x>\n", | |
190 | *((unsigned long *)&ras_log_buf), status, state); | |
191 | printk(KERN_WARNING "EPOW <0x%lx 0x%x 0x%x>\n", | |
192 | *((unsigned long *)&ras_log_buf), status, state); | |
193 | ||
194 | /* format and print the extended information */ | |
195 | log_error(ras_log_buf, ERR_TYPE_RTAS_LOG, 0); | |
196 | ||
197 | spin_unlock(&ras_log_buf_lock); | |
198 | return IRQ_HANDLED; | |
199 | } | |
200 | ||
201 | /* | |
202 | * Handle hardware error interrupts. | |
203 | * | |
204 | * RTAS check-exception is called to collect data on the exception. If | |
205 | * the error is deemed recoverable, we log a warning and return. | |
206 | * For nonrecoverable errors, an error is logged and we stop all processing | |
207 | * as quickly as possible in order to prevent propagation of the failure. | |
208 | */ | |
7d12e780 | 209 | static irqreturn_t ras_error_interrupt(int irq, void *dev_id) |
1da177e4 LT |
210 | { |
211 | struct rtas_error_log *rtas_elog; | |
212 | int status = 0xdeadbeef; | |
213 | int fatal; | |
214 | ||
215 | spin_lock(&ras_log_buf_lock); | |
216 | ||
217 | status = rtas_call(ras_check_exception_token, 6, 1, NULL, | |
218 | RAS_VECTOR_OFFSET, | |
0ebfff14 | 219 | irq_map[irq].hwirq, |
1da177e4 LT |
220 | RTAS_INTERNAL_ERROR, 1 /*Time Critical */, |
221 | __pa(&ras_log_buf), | |
222 | rtas_get_error_log_max()); | |
223 | ||
224 | rtas_elog = (struct rtas_error_log *)ras_log_buf; | |
225 | ||
226 | if ((status == 0) && (rtas_elog->severity >= RTAS_SEVERITY_ERROR_SYNC)) | |
227 | fatal = 1; | |
228 | else | |
229 | fatal = 0; | |
230 | ||
231 | /* format and print the extended information */ | |
232 | log_error(ras_log_buf, ERR_TYPE_RTAS_LOG, fatal); | |
233 | ||
234 | if (fatal) { | |
235 | udbg_printf("Fatal HW Error <0x%lx 0x%x>\n", | |
236 | *((unsigned long *)&ras_log_buf), status); | |
237 | printk(KERN_EMERG "Error: Fatal hardware error <0x%lx 0x%x>\n", | |
238 | *((unsigned long *)&ras_log_buf), status); | |
239 | ||
240 | #ifndef DEBUG | |
241 | /* Don't actually power off when debugging so we can test | |
242 | * without actually failing while injecting errors. | |
243 | * Error data will not be logged to syslog. | |
244 | */ | |
245 | ppc_md.power_off(); | |
246 | #endif | |
247 | } else { | |
248 | udbg_printf("Recoverable HW Error <0x%lx 0x%x>\n", | |
249 | *((unsigned long *)&ras_log_buf), status); | |
250 | printk(KERN_WARNING | |
251 | "Warning: Recoverable hardware error <0x%lx 0x%x>\n", | |
252 | *((unsigned long *)&ras_log_buf), status); | |
253 | } | |
254 | ||
255 | spin_unlock(&ras_log_buf_lock); | |
256 | return IRQ_HANDLED; | |
257 | } | |
258 | ||
259 | /* Get the error information for errors coming through the | |
260 | * FWNMI vectors. The pt_regs' r3 will be updated to reflect | |
261 | * the actual r3 if possible, and a ptr to the error log entry | |
262 | * will be returned if found. | |
263 | * | |
264 | * The mce_data_buf does not have any locks or protection around it, | |
265 | * if a second machine check comes in, or a system reset is done | |
266 | * before we have logged the error, then we will get corruption in the | |
267 | * error log. This is preferable over holding off on calling | |
268 | * ibm,nmi-interlock which would result in us checkstopping if a | |
269 | * second machine check did come in. | |
270 | */ | |
271 | static struct rtas_error_log *fwnmi_get_errinfo(struct pt_regs *regs) | |
272 | { | |
273 | unsigned long errdata = regs->gpr[3]; | |
274 | struct rtas_error_log *errhdr = NULL; | |
275 | unsigned long *savep; | |
276 | ||
277 | if ((errdata >= 0x7000 && errdata < 0x7fff0) || | |
278 | (errdata >= rtas.base && errdata < rtas.base + rtas.size - 16)) { | |
279 | savep = __va(errdata); | |
280 | regs->gpr[3] = savep[0]; /* restore original r3 */ | |
281 | memset(mce_data_buf, 0, RTAS_ERROR_LOG_MAX); | |
282 | memcpy(mce_data_buf, (char *)(savep + 1), RTAS_ERROR_LOG_MAX); | |
283 | errhdr = (struct rtas_error_log *)mce_data_buf; | |
284 | } else { | |
285 | printk("FWNMI: corrupt r3\n"); | |
286 | } | |
287 | return errhdr; | |
288 | } | |
289 | ||
290 | /* Call this when done with the data returned by FWNMI_get_errinfo. | |
291 | * It will release the saved data area for other CPUs in the | |
292 | * partition to receive FWNMI errors. | |
293 | */ | |
294 | static void fwnmi_release_errinfo(void) | |
295 | { | |
296 | int ret = rtas_call(rtas_token("ibm,nmi-interlock"), 0, 1, NULL); | |
297 | if (ret != 0) | |
298 | printk("FWNMI: nmi-interlock failed: %d\n", ret); | |
299 | } | |
300 | ||
c902be71 | 301 | int pSeries_system_reset_exception(struct pt_regs *regs) |
1da177e4 LT |
302 | { |
303 | if (fwnmi_active) { | |
304 | struct rtas_error_log *errhdr = fwnmi_get_errinfo(regs); | |
305 | if (errhdr) { | |
306 | /* XXX Should look at FWNMI information */ | |
307 | } | |
308 | fwnmi_release_errinfo(); | |
309 | } | |
c902be71 | 310 | return 0; /* need to perform reset */ |
1da177e4 LT |
311 | } |
312 | ||
313 | /* | |
314 | * See if we can recover from a machine check exception. | |
315 | * This is only called on power4 (or above) and only via | |
316 | * the Firmware Non-Maskable Interrupts (fwnmi) handler | |
317 | * which provides the error analysis for us. | |
318 | * | |
319 | * Return 1 if corrected (or delivered a signal). | |
320 | * Return 0 if there is nothing we can do. | |
321 | */ | |
322 | static int recover_mce(struct pt_regs *regs, struct rtas_error_log * err) | |
323 | { | |
324 | int nonfatal = 0; | |
325 | ||
326 | if (err->disposition == RTAS_DISP_FULLY_RECOVERED) { | |
327 | /* Platform corrected itself */ | |
328 | nonfatal = 1; | |
329 | } else if ((regs->msr & MSR_RI) && | |
330 | user_mode(regs) && | |
331 | err->severity == RTAS_SEVERITY_ERROR_SYNC && | |
332 | err->disposition == RTAS_DISP_NOT_RECOVERED && | |
333 | err->target == RTAS_TARGET_MEMORY && | |
334 | err->type == RTAS_TYPE_ECC_UNCORR && | |
f400e198 | 335 | !(current->pid == 0 || is_init(current))) { |
1da177e4 LT |
336 | /* Kill off a user process with an ECC error */ |
337 | printk(KERN_ERR "MCE: uncorrectable ecc error for pid %d\n", | |
338 | current->pid); | |
339 | /* XXX something better for ECC error? */ | |
340 | _exception(SIGBUS, regs, BUS_ADRERR, regs->nip); | |
341 | nonfatal = 1; | |
342 | } | |
343 | ||
d9953105 | 344 | log_error((char *)err, ERR_TYPE_RTAS_LOG, !nonfatal); |
1da177e4 LT |
345 | |
346 | return nonfatal; | |
347 | } | |
348 | ||
349 | /* | |
350 | * Handle a machine check. | |
351 | * | |
352 | * Note that on Power 4 and beyond Firmware Non-Maskable Interrupts (fwnmi) | |
353 | * should be present. If so the handler which called us tells us if the | |
354 | * error was recovered (never true if RI=0). | |
355 | * | |
356 | * On hardware prior to Power 4 these exceptions were asynchronous which | |
357 | * means we can't tell exactly where it occurred and so we can't recover. | |
358 | */ | |
359 | int pSeries_machine_check_exception(struct pt_regs *regs) | |
360 | { | |
361 | struct rtas_error_log *errp; | |
362 | ||
363 | if (fwnmi_active) { | |
364 | errp = fwnmi_get_errinfo(regs); | |
365 | fwnmi_release_errinfo(); | |
366 | if (errp && recover_mce(regs, errp)) | |
367 | return 1; | |
368 | } | |
369 | ||
370 | return 0; | |
371 | } |