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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>
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>
48#include <asm/machdep.h>
49#include <asm/rtas.h>
50#include <asm/udbg.h>
51#include <asm/firmware.h>
52
53#include "pseries.h"
54
55static unsigned char ras_log_buf[RTAS_ERROR_LOG_MAX];
56static DEFINE_SPINLOCK(ras_log_buf_lock);
57
58static char mce_data_buf[RTAS_ERROR_LOG_MAX];
59
60static int ras_get_sensor_state_token;
61static 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
67static irqreturn_t ras_epow_interrupt(int irq, void *dev_id);
68static irqreturn_t ras_error_interrupt(int irq, void *dev_id);
69
70
71static void request_ras_irqs(struct device_node *np,
72 irq_handler_t handler,
73 const char *name)
74{
75 int i, index, count = 0;
76 struct of_irq oirq;
77 const u32 *opicprop;
78 unsigned int opicplen;
79 unsigned int virqs[16];
80
81
82
83
84
85 opicprop = of_get_property(np, "open-pic-interrupt", &opicplen);
86 if (opicprop) {
87 opicplen /= sizeof(u32);
88 for (i = 0; i < opicplen; i++) {
89 if (count > 15)
90 break;
91 virqs[count] = irq_create_mapping(NULL, *(opicprop++));
92 if (virqs[count] == NO_IRQ)
93 printk(KERN_ERR "Unable to allocate interrupt "
94 "number for %s\n", np->full_name);
95 else
96 count++;
97
98 }
99 }
100
101 else {
102
103 for (index = 0; of_irq_map_one(np, index, &oirq) == 0;
104 index++) {
105 if (count > 15)
106 break;
107 virqs[count] = irq_create_of_mapping(oirq.controller,
108 oirq.specifier,
109 oirq.size);
110 if (virqs[count] == NO_IRQ)
111 printk(KERN_ERR "Unable to allocate interrupt "
112 "number for %s\n", np->full_name);
113 else
114 count++;
115 }
116 }
117
118
119 for (i = 0; i < count; i++) {
120 if (request_irq(virqs[i], handler, 0, name, NULL)) {
121 printk(KERN_ERR "Unable to request interrupt %d for "
122 "%s\n", virqs[i], np->full_name);
123 return;
124 }
125 }
126}
127
128
129
130
131
132static int __init init_ras_IRQ(void)
133{
134 struct device_node *np;
135
136 ras_get_sensor_state_token = rtas_token("get-sensor-state");
137 ras_check_exception_token = rtas_token("check-exception");
138
139
140 np = of_find_node_by_path("/event-sources/internal-errors");
141 if (np != NULL) {
142 request_ras_irqs(np, ras_error_interrupt, "RAS_ERROR");
143 of_node_put(np);
144 }
145
146
147 np = of_find_node_by_path("/event-sources/epow-events");
148 if (np != NULL) {
149 request_ras_irqs(np, ras_epow_interrupt, "RAS_EPOW");
150 of_node_put(np);
151 }
152
153 return 0;
154}
155__initcall(init_ras_IRQ);
156
157
158
159
160
161
162
163
164static irqreturn_t ras_epow_interrupt(int irq, void *dev_id)
165{
166 int status = 0xdeadbeef;
167 int state = 0;
168 int critical;
169
170 status = rtas_call(ras_get_sensor_state_token, 2, 2, &state,
171 EPOW_SENSOR_TOKEN, EPOW_SENSOR_INDEX);
172
173 if (state > 3)
174 critical = 1;
175 else
176 critical = 0;
177
178 spin_lock(&ras_log_buf_lock);
179
180 status = rtas_call(ras_check_exception_token, 6, 1, NULL,
181 RAS_VECTOR_OFFSET,
182 irq_map[irq].hwirq,
183 RTAS_EPOW_WARNING | RTAS_POWERMGM_EVENTS,
184 critical, __pa(&ras_log_buf),
185 rtas_get_error_log_max());
186
187 udbg_printf("EPOW <0x%lx 0x%x 0x%x>\n",
188 *((unsigned long *)&ras_log_buf), status, state);
189 printk(KERN_WARNING "EPOW <0x%lx 0x%x 0x%x>\n",
190 *((unsigned long *)&ras_log_buf), status, state);
191
192
193 log_error(ras_log_buf, ERR_TYPE_RTAS_LOG, 0);
194
195 spin_unlock(&ras_log_buf_lock);
196 return IRQ_HANDLED;
197}
198
199
200
201
202
203
204
205
206
207static irqreturn_t ras_error_interrupt(int irq, void *dev_id)
208{
209 struct rtas_error_log *rtas_elog;
210 int status = 0xdeadbeef;
211 int fatal;
212
213 spin_lock(&ras_log_buf_lock);
214
215 status = rtas_call(ras_check_exception_token, 6, 1, NULL,
216 RAS_VECTOR_OFFSET,
217 irq_map[irq].hwirq,
218 RTAS_INTERNAL_ERROR, 1 ,
219 __pa(&ras_log_buf),
220 rtas_get_error_log_max());
221
222 rtas_elog = (struct rtas_error_log *)ras_log_buf;
223
224 if ((status == 0) && (rtas_elog->severity >= RTAS_SEVERITY_ERROR_SYNC))
225 fatal = 1;
226 else
227 fatal = 0;
228
229
230 log_error(ras_log_buf, ERR_TYPE_RTAS_LOG, fatal);
231
232 if (fatal) {
233 udbg_printf("Fatal HW Error <0x%lx 0x%x>\n",
234 *((unsigned long *)&ras_log_buf), status);
235 printk(KERN_EMERG "Error: Fatal hardware error <0x%lx 0x%x>\n",
236 *((unsigned long *)&ras_log_buf), status);
237
238#ifndef DEBUG_RTAS_POWER_OFF
239
240
241
242
243 ppc_md.power_off();
244#endif
245 } else {
246 udbg_printf("Recoverable HW Error <0x%lx 0x%x>\n",
247 *((unsigned long *)&ras_log_buf), status);
248 printk(KERN_WARNING
249 "Warning: Recoverable hardware error <0x%lx 0x%x>\n",
250 *((unsigned long *)&ras_log_buf), status);
251 }
252
253 spin_unlock(&ras_log_buf_lock);
254 return IRQ_HANDLED;
255}
256
257
258
259
260
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264
265
266
267
268
269static struct rtas_error_log *fwnmi_get_errinfo(struct pt_regs *regs)
270{
271 unsigned long errdata = regs->gpr[3];
272 struct rtas_error_log *errhdr = NULL;
273 unsigned long *savep;
274
275 if ((errdata >= 0x7000 && errdata < 0x7fff0) ||
276 (errdata >= rtas.base && errdata < rtas.base + rtas.size - 16)) {
277 savep = __va(errdata);
278 regs->gpr[3] = savep[0];
279 memset(mce_data_buf, 0, RTAS_ERROR_LOG_MAX);
280 memcpy(mce_data_buf, (char *)(savep + 1), RTAS_ERROR_LOG_MAX);
281 errhdr = (struct rtas_error_log *)mce_data_buf;
282 } else {
283 printk("FWNMI: corrupt r3\n");
284 }
285 return errhdr;
286}
287
288
289
290
291
292static void fwnmi_release_errinfo(void)
293{
294 int ret = rtas_call(rtas_token("ibm,nmi-interlock"), 0, 1, NULL);
295 if (ret != 0)
296 printk("FWNMI: nmi-interlock failed: %d\n", ret);
297}
298
299int pSeries_system_reset_exception(struct pt_regs *regs)
300{
301 if (fwnmi_active) {
302 struct rtas_error_log *errhdr = fwnmi_get_errinfo(regs);
303 if (errhdr) {
304
305 }
306 fwnmi_release_errinfo();
307 }
308 return 0;
309}
310
311
312
313
314
315
316
317
318
319
320static int recover_mce(struct pt_regs *regs, struct rtas_error_log * err)
321{
322 int nonfatal = 0;
323
324 if (err->disposition == RTAS_DISP_FULLY_RECOVERED) {
325
326 nonfatal = 1;
327 } else if ((regs->msr & MSR_RI) &&
328 user_mode(regs) &&
329 err->severity == RTAS_SEVERITY_ERROR_SYNC &&
330 err->disposition == RTAS_DISP_NOT_RECOVERED &&
331 err->target == RTAS_TARGET_MEMORY &&
332 err->type == RTAS_TYPE_ECC_UNCORR &&
333 !(current->pid == 0 || is_global_init(current))) {
334
335 printk(KERN_ERR "MCE: uncorrectable ecc error for pid %d\n",
336 current->pid);
337
338 _exception(SIGBUS, regs, BUS_ADRERR, regs->nip);
339 nonfatal = 1;
340 }
341
342 log_error((char *)err, ERR_TYPE_RTAS_LOG, !nonfatal);
343
344 return nonfatal;
345}
346
347
348
349
350
351
352
353
354
355
356
357int pSeries_machine_check_exception(struct pt_regs *regs)
358{
359 struct rtas_error_log *errp;
360
361 if (fwnmi_active) {
362 errp = fwnmi_get_errinfo(regs);
363 fwnmi_release_errinfo();
364 if (errp && recover_mce(regs, errp))
365 return 1;
366 }
367
368 return 0;
369}
370