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77bd7415 LV |
1 | /* |
2 | * PCI Error Recovery Driver for RPA-compliant PPC64 platform. | |
3 | * Copyright (C) 2004, 2005 Linas Vepstas <linas@linas.org> | |
4 | * | |
5 | * All rights reserved. | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License as published by | |
9 | * the Free Software Foundation; either version 2 of the License, or (at | |
10 | * your option) any later version. | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, but | |
13 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or | |
15 | * NON INFRINGEMENT. See the GNU General Public License for more | |
16 | * details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License | |
19 | * along with this program; if not, write to the Free Software | |
20 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
21 | * | |
22 | * Send feedback to <linas@us.ibm.com> | |
23 | * | |
24 | */ | |
25 | #include <linux/delay.h> | |
77bd7415 | 26 | #include <linux/interrupt.h> |
ac325acd | 27 | #include <linux/irq.h> |
77bd7415 LV |
28 | #include <linux/pci.h> |
29 | #include <asm/eeh.h> | |
30 | #include <asm/eeh_event.h> | |
31 | #include <asm/ppc-pci.h> | |
32 | #include <asm/pci-bridge.h> | |
33 | #include <asm/prom.h> | |
34 | #include <asm/rtas.h> | |
35 | ||
36 | ||
37 | static inline const char * pcid_name (struct pci_dev *pdev) | |
38 | { | |
273d2803 | 39 | if (pdev && pdev->dev.driver) |
77bd7415 LV |
40 | return pdev->dev.driver->name; |
41 | return ""; | |
42 | } | |
43 | ||
77bd7415 LV |
44 | #ifdef DEBUG |
45 | static void print_device_node_tree (struct pci_dn *pdn, int dent) | |
46 | { | |
47 | int i; | |
48 | if (!pdn) return; | |
49 | for (i=0;i<dent; i++) | |
50 | printk(" "); | |
51 | printk("dn=%s mode=%x \tcfg_addr=%x pe_addr=%x \tfull=%s\n", | |
52 | pdn->node->name, pdn->eeh_mode, pdn->eeh_config_addr, | |
53 | pdn->eeh_pe_config_addr, pdn->node->full_name); | |
54 | dent += 3; | |
55 | struct device_node *pc = pdn->node->child; | |
56 | while (pc) { | |
57 | print_device_node_tree(PCI_DN(pc), dent); | |
58 | pc = pc->sibling; | |
59 | } | |
60 | } | |
61 | #endif | |
62 | ||
63 | /** | |
64 | * irq_in_use - return true if this irq is being used | |
65 | */ | |
66 | static int irq_in_use(unsigned int irq) | |
67 | { | |
68 | int rc = 0; | |
69 | unsigned long flags; | |
70 | struct irq_desc *desc = irq_desc + irq; | |
71 | ||
72 | spin_lock_irqsave(&desc->lock, flags); | |
73 | if (desc->action) | |
74 | rc = 1; | |
75 | spin_unlock_irqrestore(&desc->lock, flags); | |
76 | return rc; | |
77 | } | |
78 | ||
79 | /* ------------------------------------------------------- */ | |
cb5b5624 LV |
80 | /** |
81 | * eeh_report_error - report pci error to each device driver | |
82 | * | |
83 | * Report an EEH error to each device driver, collect up and | |
84 | * merge the device driver responses. Cumulative response | |
85 | * passed back in "userdata". | |
77bd7415 LV |
86 | */ |
87 | ||
88 | static void eeh_report_error(struct pci_dev *dev, void *userdata) | |
89 | { | |
18eb3b39 | 90 | enum pci_ers_result rc, *res = userdata; |
77bd7415 LV |
91 | struct pci_driver *driver = dev->driver; |
92 | ||
93 | dev->error_state = pci_channel_io_frozen; | |
94 | ||
95 | if (!driver) | |
96 | return; | |
97 | ||
98 | if (irq_in_use (dev->irq)) { | |
99 | struct device_node *dn = pci_device_to_OF_node(dev); | |
100 | PCI_DN(dn)->eeh_mode |= EEH_MODE_IRQ_DISABLED; | |
101 | disable_irq_nosync(dev->irq); | |
102 | } | |
6a1ca373 LV |
103 | if (!driver->err_handler || |
104 | !driver->err_handler->error_detected) | |
77bd7415 LV |
105 | return; |
106 | ||
107 | rc = driver->err_handler->error_detected (dev, pci_channel_io_frozen); | |
18eb3b39 | 108 | if (*res == PCI_ERS_RESULT_NONE) *res = rc; |
6a1ca373 LV |
109 | if (*res == PCI_ERS_RESULT_DISCONNECT && |
110 | rc == PCI_ERS_RESULT_NEED_RESET) *res = rc; | |
111 | } | |
112 | ||
113 | /** | |
114 | * eeh_report_mmio_enabled - tell drivers that MMIO has been enabled | |
115 | * | |
116 | * Report an EEH error to each device driver, collect up and | |
117 | * merge the device driver responses. Cumulative response | |
118 | * passed back in "userdata". | |
119 | */ | |
120 | ||
121 | static void eeh_report_mmio_enabled(struct pci_dev *dev, void *userdata) | |
122 | { | |
123 | enum pci_ers_result rc, *res = userdata; | |
124 | struct pci_driver *driver = dev->driver; | |
125 | ||
126 | // dev->error_state = pci_channel_mmio_enabled; | |
127 | ||
128 | if (!driver || | |
129 | !driver->err_handler || | |
130 | !driver->err_handler->mmio_enabled) | |
131 | return; | |
132 | ||
133 | rc = driver->err_handler->mmio_enabled (dev); | |
134 | if (*res == PCI_ERS_RESULT_NONE) *res = rc; | |
18eb3b39 PM |
135 | if (*res == PCI_ERS_RESULT_DISCONNECT && |
136 | rc == PCI_ERS_RESULT_NEED_RESET) *res = rc; | |
77bd7415 LV |
137 | } |
138 | ||
cb5b5624 LV |
139 | /** |
140 | * eeh_report_reset - tell device that slot has been reset | |
77bd7415 LV |
141 | */ |
142 | ||
143 | static void eeh_report_reset(struct pci_dev *dev, void *userdata) | |
144 | { | |
6a1ca373 | 145 | enum pci_ers_result rc, *res = userdata; |
77bd7415 LV |
146 | struct pci_driver *driver = dev->driver; |
147 | struct device_node *dn = pci_device_to_OF_node(dev); | |
148 | ||
149 | if (!driver) | |
150 | return; | |
151 | ||
152 | if ((PCI_DN(dn)->eeh_mode) & EEH_MODE_IRQ_DISABLED) { | |
153 | PCI_DN(dn)->eeh_mode &= ~EEH_MODE_IRQ_DISABLED; | |
154 | enable_irq(dev->irq); | |
155 | } | |
6a1ca373 LV |
156 | if (!driver->err_handler || |
157 | !driver->err_handler->slot_reset) | |
77bd7415 LV |
158 | return; |
159 | ||
6a1ca373 LV |
160 | rc = driver->err_handler->slot_reset(dev); |
161 | if (*res == PCI_ERS_RESULT_NONE) *res = rc; | |
162 | if (*res == PCI_ERS_RESULT_DISCONNECT && | |
163 | rc == PCI_ERS_RESULT_NEED_RESET) *res = rc; | |
77bd7415 LV |
164 | } |
165 | ||
cb5b5624 LV |
166 | /** |
167 | * eeh_report_resume - tell device to resume normal operations | |
168 | */ | |
169 | ||
77bd7415 LV |
170 | static void eeh_report_resume(struct pci_dev *dev, void *userdata) |
171 | { | |
172 | struct pci_driver *driver = dev->driver; | |
173 | ||
174 | dev->error_state = pci_channel_io_normal; | |
175 | ||
176 | if (!driver) | |
177 | return; | |
178 | if (!driver->err_handler) | |
179 | return; | |
180 | if (!driver->err_handler->resume) | |
181 | return; | |
182 | ||
183 | driver->err_handler->resume(dev); | |
184 | } | |
185 | ||
cb5b5624 LV |
186 | /** |
187 | * eeh_report_failure - tell device driver that device is dead. | |
188 | * | |
189 | * This informs the device driver that the device is permanently | |
190 | * dead, and that no further recovery attempts will be made on it. | |
191 | */ | |
192 | ||
77bd7415 LV |
193 | static void eeh_report_failure(struct pci_dev *dev, void *userdata) |
194 | { | |
195 | struct pci_driver *driver = dev->driver; | |
196 | ||
197 | dev->error_state = pci_channel_io_perm_failure; | |
198 | ||
199 | if (!driver) | |
200 | return; | |
201 | ||
202 | if (irq_in_use (dev->irq)) { | |
203 | struct device_node *dn = pci_device_to_OF_node(dev); | |
204 | PCI_DN(dn)->eeh_mode |= EEH_MODE_IRQ_DISABLED; | |
205 | disable_irq_nosync(dev->irq); | |
206 | } | |
207 | if (!driver->err_handler) | |
208 | return; | |
209 | if (!driver->err_handler->error_detected) | |
210 | return; | |
211 | driver->err_handler->error_detected(dev, pci_channel_io_perm_failure); | |
212 | } | |
213 | ||
214 | /* ------------------------------------------------------- */ | |
215 | /** | |
216 | * handle_eeh_events -- reset a PCI device after hard lockup. | |
217 | * | |
218 | * pSeries systems will isolate a PCI slot if the PCI-Host | |
219 | * bridge detects address or data parity errors, DMA's | |
80f7228b | 220 | * occurring to wild addresses (which usually happen due to |
77bd7415 LV |
221 | * bugs in device drivers or in PCI adapter firmware). |
222 | * Slot isolations also occur if #SERR, #PERR or other misc | |
223 | * PCI-related errors are detected. | |
224 | * | |
225 | * Recovery process consists of unplugging the device driver | |
226 | * (which generated hotplug events to userspace), then issuing | |
227 | * a PCI #RST to the device, then reconfiguring the PCI config | |
228 | * space for all bridges & devices under this slot, and then | |
229 | * finally restarting the device drivers (which cause a second | |
230 | * set of hotplug events to go out to userspace). | |
231 | */ | |
232 | ||
233 | /** | |
234 | * eeh_reset_device() -- perform actual reset of a pci slot | |
cb5b5624 | 235 | * @bus: pointer to the pci bus structure corresponding |
77bd7415 LV |
236 | * to the isolated slot. A non-null value will |
237 | * cause all devices under the bus to be removed | |
238 | * and then re-added. | |
cb5b5624 | 239 | * @pe_dn: pointer to a "Partionable Endpoint" device node. |
77bd7415 LV |
240 | * This is the top-level structure on which pci |
241 | * bus resets can be performed. | |
242 | */ | |
243 | ||
b6495c0c | 244 | static int eeh_reset_device (struct pci_dn *pe_dn, struct pci_bus *bus) |
77bd7415 | 245 | { |
42405456 LV |
246 | int cnt, rc; |
247 | ||
248 | /* pcibios will clear the counter; save the value */ | |
249 | cnt = pe_dn->eeh_freeze_count; | |
250 | ||
77bd7415 LV |
251 | if (bus) |
252 | pcibios_remove_pci_devices(bus); | |
253 | ||
254 | /* Reset the pci controller. (Asserts RST#; resets config space). | |
b6495c0c LV |
255 | * Reconfigure bridges and devices. Don't try to bring the system |
256 | * up if the reset failed for some reason. */ | |
257 | rc = rtas_set_slot_reset(pe_dn); | |
258 | if (rc) | |
259 | return rc; | |
77bd7415 | 260 | |
3914ac7b LV |
261 | /* New-style config addrs might be shared across multiple devices, |
262 | * Walk over all functions on this device */ | |
263 | if (pe_dn->eeh_pe_config_addr) { | |
264 | struct device_node *pe = pe_dn->node; | |
265 | pe = pe->parent->child; | |
266 | while (pe) { | |
267 | struct pci_dn *ppe = PCI_DN(pe); | |
268 | if (pe_dn->eeh_pe_config_addr == ppe->eeh_pe_config_addr) { | |
269 | rtas_configure_bridge(ppe); | |
270 | eeh_restore_bars(ppe); | |
271 | } | |
272 | pe = pe->sibling; | |
273 | } | |
274 | } else { | |
275 | rtas_configure_bridge(pe_dn); | |
276 | eeh_restore_bars(pe_dn); | |
277 | } | |
77bd7415 LV |
278 | |
279 | /* Give the system 5 seconds to finish running the user-space | |
280 | * hotplug shutdown scripts, e.g. ifdown for ethernet. Yes, | |
281 | * this is a hack, but if we don't do this, and try to bring | |
282 | * the device up before the scripts have taken it down, | |
283 | * potentially weird things happen. | |
284 | */ | |
285 | if (bus) { | |
286 | ssleep (5); | |
287 | pcibios_add_pci_devices(bus); | |
288 | } | |
42405456 | 289 | pe_dn->eeh_freeze_count = cnt; |
b6495c0c LV |
290 | |
291 | return 0; | |
77bd7415 LV |
292 | } |
293 | ||
294 | /* The longest amount of time to wait for a pci device | |
295 | * to come back on line, in seconds. | |
296 | */ | |
297 | #define MAX_WAIT_FOR_RECOVERY 15 | |
298 | ||
ac325acd | 299 | struct pci_dn * handle_eeh_events (struct eeh_event *event) |
77bd7415 LV |
300 | { |
301 | struct device_node *frozen_dn; | |
302 | struct pci_dn *frozen_pdn; | |
303 | struct pci_bus *frozen_bus; | |
b6495c0c | 304 | int rc = 0; |
18eb3b39 | 305 | enum pci_ers_result result = PCI_ERS_RESULT_NONE; |
0aa8d15b | 306 | const char *location, *pci_str, *drv_str; |
77bd7415 LV |
307 | |
308 | frozen_dn = find_device_pe(event->dn); | |
309 | frozen_bus = pcibios_find_pci_bus(frozen_dn); | |
310 | ||
311 | if (!frozen_dn) { | |
0aa8d15b | 312 | |
954a46e2 | 313 | location = get_property(event->dn, "ibm,loc-code", NULL); |
0aa8d15b LV |
314 | location = location ? location : "unknown"; |
315 | printk(KERN_ERR "EEH: Error: Cannot find partition endpoint " | |
316 | "for location=%s pci addr=%s\n", | |
317 | location, pci_name(event->dev)); | |
ac325acd | 318 | return NULL; |
77bd7415 | 319 | } |
954a46e2 | 320 | location = get_property(frozen_dn, "ibm,loc-code", NULL); |
0aa8d15b | 321 | location = location ? location : "unknown"; |
77bd7415 LV |
322 | |
323 | /* There are two different styles for coming up with the PE. | |
324 | * In the old style, it was the highest EEH-capable device | |
325 | * which was always an EADS pci bridge. In the new style, | |
326 | * there might not be any EADS bridges, and even when there are, | |
327 | * the firmware marks them as "EEH incapable". So another | |
328 | * two-step is needed to find the pci bus.. */ | |
329 | if (!frozen_bus) | |
330 | frozen_bus = pcibios_find_pci_bus (frozen_dn->parent); | |
331 | ||
332 | if (!frozen_bus) { | |
0aa8d15b LV |
333 | printk(KERN_ERR "EEH: Cannot find PCI bus " |
334 | "for location=%s dn=%s\n", | |
335 | location, frozen_dn->full_name); | |
ac325acd | 336 | return NULL; |
77bd7415 LV |
337 | } |
338 | ||
339 | #if 0 | |
340 | /* We may get "permanent failure" messages on empty slots. | |
341 | * These are false alarms. Empty slots have no child dn. */ | |
342 | if ((event->state == pci_channel_io_perm_failure) && (frozen_device == NULL)) | |
343 | return; | |
344 | #endif | |
345 | ||
346 | frozen_pdn = PCI_DN(frozen_dn); | |
347 | frozen_pdn->eeh_freeze_count++; | |
b4f382a3 | 348 | |
a219be2c LV |
349 | if (frozen_pdn->pcidev) { |
350 | pci_str = pci_name (frozen_pdn->pcidev); | |
351 | drv_str = pcid_name (frozen_pdn->pcidev); | |
352 | } else { | |
b4f382a3 LV |
353 | pci_str = pci_name (event->dev); |
354 | drv_str = pcid_name (event->dev); | |
355 | } | |
77bd7415 LV |
356 | |
357 | if (frozen_pdn->eeh_freeze_count > EEH_MAX_ALLOWED_FREEZES) | |
8df83028 | 358 | goto excess_failures; |
77bd7415 LV |
359 | |
360 | /* If the reset state is a '5' and the time to reset is 0 (infinity) | |
361 | * or is more then 15 seconds, then mark this as a permanent failure. | |
362 | */ | |
363 | if ((event->state == pci_channel_io_perm_failure) && | |
364 | ((event->time_unavail <= 0) || | |
365 | (event->time_unavail > MAX_WAIT_FOR_RECOVERY*1000))) | |
b6495c0c | 366 | goto hard_fail; |
77bd7415 LV |
367 | |
368 | eeh_slot_error_detail(frozen_pdn, 1 /* Temporary Error */); | |
369 | printk(KERN_WARNING | |
0aa8d15b LV |
370 | "EEH: This PCI device has failed %d times since last reboot: " |
371 | "location=%s driver=%s pci addr=%s\n", | |
372 | frozen_pdn->eeh_freeze_count, location, drv_str, pci_str); | |
77bd7415 LV |
373 | |
374 | /* Walk the various device drivers attached to this slot through | |
375 | * a reset sequence, giving each an opportunity to do what it needs | |
376 | * to accomplish the reset. Each child gets a report of the | |
377 | * status ... if any child can't handle the reset, then the entire | |
378 | * slot is dlpar removed and added. | |
379 | */ | |
77bd7415 LV |
380 | pci_walk_bus(frozen_bus, eeh_report_error, &result); |
381 | ||
382 | /* If all device drivers were EEH-unaware, then shut | |
383 | * down all of the device drivers, and hope they | |
384 | * go down willingly, without panicing the system. | |
385 | */ | |
18eb3b39 | 386 | if (result == PCI_ERS_RESULT_NONE) { |
b6495c0c LV |
387 | rc = eeh_reset_device(frozen_pdn, frozen_bus); |
388 | if (rc) | |
389 | goto hard_fail; | |
77bd7415 LV |
390 | } |
391 | ||
6a1ca373 LV |
392 | /* If all devices reported they can proceed, then re-enable MMIO */ |
393 | if (result == PCI_ERS_RESULT_CAN_RECOVER) { | |
394 | rc = rtas_pci_enable(frozen_pdn, EEH_THAW_MMIO); | |
395 | ||
396 | if (rc) { | |
397 | result = PCI_ERS_RESULT_NEED_RESET; | |
398 | } else { | |
399 | result = PCI_ERS_RESULT_NONE; | |
400 | pci_walk_bus(frozen_bus, eeh_report_mmio_enabled, &result); | |
401 | } | |
77bd7415 LV |
402 | } |
403 | ||
6a1ca373 | 404 | /* If all devices reported they can proceed, then re-enable DMA */ |
18eb3b39 | 405 | if (result == PCI_ERS_RESULT_CAN_RECOVER) { |
6a1ca373 LV |
406 | rc = rtas_pci_enable(frozen_pdn, EEH_THAW_DMA); |
407 | ||
408 | if (rc) | |
409 | result = PCI_ERS_RESULT_NEED_RESET; | |
410 | } | |
411 | ||
412 | /* If any device has a hard failure, then shut off everything. */ | |
413 | if (result == PCI_ERS_RESULT_DISCONNECT) | |
414 | goto hard_fail; | |
415 | ||
416 | /* If any device called out for a reset, then reset the slot */ | |
417 | if (result == PCI_ERS_RESULT_NEED_RESET) { | |
b6495c0c LV |
418 | rc = eeh_reset_device(frozen_pdn, NULL); |
419 | if (rc) | |
420 | goto hard_fail; | |
6a1ca373 LV |
421 | result = PCI_ERS_RESULT_NONE; |
422 | pci_walk_bus(frozen_bus, eeh_report_reset, &result); | |
77bd7415 LV |
423 | } |
424 | ||
6a1ca373 LV |
425 | /* All devices should claim they have recovered by now. */ |
426 | if (result != PCI_ERS_RESULT_RECOVERED) | |
427 | goto hard_fail; | |
428 | ||
77bd7415 | 429 | /* Tell all device drivers that they can resume operations */ |
d04e4e11 | 430 | pci_walk_bus(frozen_bus, eeh_report_resume, NULL); |
b6495c0c | 431 | |
ac325acd | 432 | return frozen_pdn; |
b6495c0c | 433 | |
8df83028 | 434 | excess_failures: |
b6495c0c LV |
435 | /* |
436 | * About 90% of all real-life EEH failures in the field | |
437 | * are due to poorly seated PCI cards. Only 10% or so are | |
438 | * due to actual, failed cards. | |
439 | */ | |
440 | printk(KERN_ERR | |
0aa8d15b LV |
441 | "EEH: PCI device at location=%s driver=%s pci addr=%s \n" |
442 | "has failed %d times and has been permanently disabled. \n" | |
443 | "Please try reseating this device or replacing it.\n", | |
444 | location, drv_str, pci_str, frozen_pdn->eeh_freeze_count); | |
8df83028 LV |
445 | goto perm_error; |
446 | ||
447 | hard_fail: | |
448 | printk(KERN_ERR | |
0aa8d15b LV |
449 | "EEH: Unable to recover from failure of PCI device " |
450 | "at location=%s driver=%s pci addr=%s \n" | |
8df83028 | 451 | "Please try reseating this device or replacing it.\n", |
0aa8d15b | 452 | location, drv_str, pci_str); |
b6495c0c | 453 | |
8df83028 | 454 | perm_error: |
b6495c0c LV |
455 | eeh_slot_error_detail(frozen_pdn, 2 /* Permanent Error */); |
456 | ||
457 | /* Notify all devices that they're about to go down. */ | |
d04e4e11 | 458 | pci_walk_bus(frozen_bus, eeh_report_failure, NULL); |
b6495c0c LV |
459 | |
460 | /* Shut down the device drivers for good. */ | |
461 | pcibios_remove_pci_devices(frozen_bus); | |
ac325acd LV |
462 | |
463 | return NULL; | |
77bd7415 LV |
464 | } |
465 | ||
466 | /* ---------- end of file ---------- */ |