aboutsummaryrefslogtreecommitdiffstats
path: root/arch/powerpc/platforms
diff options
context:
space:
mode:
authorLinas Vepstas <linas@linas.org>2005-11-03 19:52:49 -0500
committerPaul Mackerras <paulus@samba.org>2006-01-09 23:28:32 -0500
commit77bd741561016134d1761d6101c4f0361025062f (patch)
tree5e3389b6941add4b24a2be64c730b7a9087c1f2f /arch/powerpc/platforms
parent977127174a7dff52d17faeeb4c4949a54221881f (diff)
[PATCH] powerpc: PCI Error Recovery: PPC64 core recovery routines
Various PCI bus errors can be signaled by newer PCI controllers. The core error recovery routines are architecture dependent. This patch adds a recovery infrastructure for the PPC64 pSeries systems. Signed-off-by: Linas Vepstas <linas@austin.ibm.com> Signed-off-by: Paul Mackerras <paulus@samba.org> (cherry picked from e8ca11b460c4c9c7fa6b529be221529ebd770e38 commit)
Diffstat (limited to 'arch/powerpc/platforms')
-rw-r--r--arch/powerpc/platforms/pseries/Makefile2
-rw-r--r--arch/powerpc/platforms/pseries/eeh.c17
-rw-r--r--arch/powerpc/platforms/pseries/eeh_driver.c366
-rw-r--r--arch/powerpc/platforms/pseries/eeh_event.c39
4 files changed, 394 insertions, 30 deletions
diff --git a/arch/powerpc/platforms/pseries/Makefile b/arch/powerpc/platforms/pseries/Makefile
index 6accdd155505..0b7d5cb64177 100644
--- a/arch/powerpc/platforms/pseries/Makefile
+++ b/arch/powerpc/platforms/pseries/Makefile
@@ -4,7 +4,7 @@ obj-$(CONFIG_SMP) += smp.o
4obj-$(CONFIG_IBMVIO) += vio.o 4obj-$(CONFIG_IBMVIO) += vio.o
5obj-$(CONFIG_XICS) += xics.o 5obj-$(CONFIG_XICS) += xics.o
6obj-$(CONFIG_SCANLOG) += scanlog.o 6obj-$(CONFIG_SCANLOG) += scanlog.o
7obj-$(CONFIG_EEH) += eeh.o eeh_event.o 7obj-$(CONFIG_EEH) += eeh.o eeh_driver.o eeh_event.o
8 8
9obj-$(CONFIG_HVC_CONSOLE) += hvconsole.o 9obj-$(CONFIG_HVC_CONSOLE) += hvconsole.o
10obj-$(CONFIG_HVCS) += hvcserver.o 10obj-$(CONFIG_HVCS) += hvcserver.o
diff --git a/arch/powerpc/platforms/pseries/eeh.c b/arch/powerpc/platforms/pseries/eeh.c
index 7fbfd16d72b7..d6560c45637b 100644
--- a/arch/powerpc/platforms/pseries/eeh.c
+++ b/arch/powerpc/platforms/pseries/eeh.c
@@ -485,6 +485,11 @@ static void __eeh_mark_slot (struct device_node *dn, int mode_flag)
485 if (PCI_DN(dn)) { 485 if (PCI_DN(dn)) {
486 PCI_DN(dn)->eeh_mode |= mode_flag; 486 PCI_DN(dn)->eeh_mode |= mode_flag;
487 487
488 /* Mark the pci device driver too */
489 struct pci_dev *dev = PCI_DN(dn)->pcidev;
490 if (dev && dev->driver)
491 dev->error_state = pci_channel_io_frozen;
492
488 if (dn->child) 493 if (dn->child)
489 __eeh_mark_slot (dn->child, mode_flag); 494 __eeh_mark_slot (dn->child, mode_flag);
490 } 495 }
@@ -544,6 +549,7 @@ int eeh_dn_check_failure(struct device_node *dn, struct pci_dev *dev)
544 int rets[3]; 549 int rets[3];
545 unsigned long flags; 550 unsigned long flags;
546 struct pci_dn *pdn; 551 struct pci_dn *pdn;
552 enum pci_channel_state state;
547 int rc = 0; 553 int rc = 0;
548 554
549 __get_cpu_var(total_mmio_ffs)++; 555 __get_cpu_var(total_mmio_ffs)++;
@@ -648,8 +654,13 @@ int eeh_dn_check_failure(struct device_node *dn, struct pci_dev *dev)
648 eeh_mark_slot (dn, EEH_MODE_ISOLATED); 654 eeh_mark_slot (dn, EEH_MODE_ISOLATED);
649 spin_unlock_irqrestore(&confirm_error_lock, flags); 655 spin_unlock_irqrestore(&confirm_error_lock, flags);
650 656
651 eeh_send_failure_event (dn, dev, rets[0], rets[2]); 657 state = pci_channel_io_normal;
652 658 if ((rets[0] == 2) || (rets[0] == 4))
659 state = pci_channel_io_frozen;
660 if (rets[0] == 5)
661 state = pci_channel_io_perm_failure;
662 eeh_send_failure_event (dn, dev, state, rets[2]);
663
653 /* Most EEH events are due to device driver bugs. Having 664 /* Most EEH events are due to device driver bugs. Having
654 * a stack trace will help the device-driver authors figure 665 * a stack trace will help the device-driver authors figure
655 * out what happened. So print that out. */ 666 * out what happened. So print that out. */
@@ -953,8 +964,10 @@ static void *early_enable_eeh(struct device_node *dn, void *data)
953 * But there are a few cases like display devices that make sense. 964 * But there are a few cases like display devices that make sense.
954 */ 965 */
955 enable = 1; /* i.e. we will do checking */ 966 enable = 1; /* i.e. we will do checking */
967#if 0
956 if ((*class_code >> 16) == PCI_BASE_CLASS_DISPLAY) 968 if ((*class_code >> 16) == PCI_BASE_CLASS_DISPLAY)
957 enable = 0; 969 enable = 0;
970#endif
958 971
959 if (!enable) 972 if (!enable)
960 pdn->eeh_mode |= EEH_MODE_NOCHECK; 973 pdn->eeh_mode |= EEH_MODE_NOCHECK;
diff --git a/arch/powerpc/platforms/pseries/eeh_driver.c b/arch/powerpc/platforms/pseries/eeh_driver.c
new file mode 100644
index 000000000000..f6cff065d89d
--- /dev/null
+++ b/arch/powerpc/platforms/pseries/eeh_driver.c
@@ -0,0 +1,366 @@
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>
26#include <linux/irq.h>
27#include <linux/interrupt.h>
28#include <linux/notifier.h>
29#include <linux/pci.h>
30#include <asm/eeh.h>
31#include <asm/eeh_event.h>
32#include <asm/ppc-pci.h>
33#include <asm/pci-bridge.h>
34#include <asm/prom.h>
35#include <asm/rtas.h>
36
37
38static inline const char * pcid_name (struct pci_dev *pdev)
39{
40 if (pdev->dev.driver)
41 return pdev->dev.driver->name;
42 return "";
43}
44
45/**
46 * Return the "partitionable endpoint" (pe) under which this device lies
47 */
48static struct device_node * find_device_pe(struct device_node *dn)
49{
50 while ((dn->parent) && PCI_DN(dn->parent) &&
51 (PCI_DN(dn->parent)->eeh_mode & EEH_MODE_SUPPORTED)) {
52 dn = dn->parent;
53 }
54 return dn;
55}
56
57
58#ifdef DEBUG
59static void print_device_node_tree (struct pci_dn *pdn, int dent)
60{
61 int i;
62 if (!pdn) return;
63 for (i=0;i<dent; i++)
64 printk(" ");
65 printk("dn=%s mode=%x \tcfg_addr=%x pe_addr=%x \tfull=%s\n",
66 pdn->node->name, pdn->eeh_mode, pdn->eeh_config_addr,
67 pdn->eeh_pe_config_addr, pdn->node->full_name);
68 dent += 3;
69 struct device_node *pc = pdn->node->child;
70 while (pc) {
71 print_device_node_tree(PCI_DN(pc), dent);
72 pc = pc->sibling;
73 }
74}
75#endif
76
77/**
78 * irq_in_use - return true if this irq is being used
79 */
80static int irq_in_use(unsigned int irq)
81{
82 int rc = 0;
83 unsigned long flags;
84 struct irq_desc *desc = irq_desc + irq;
85
86 spin_lock_irqsave(&desc->lock, flags);
87 if (desc->action)
88 rc = 1;
89 spin_unlock_irqrestore(&desc->lock, flags);
90 return rc;
91}
92
93/* ------------------------------------------------------- */
94/** eeh_report_error - report an EEH error to each device,
95 * collect up and merge the device responses.
96 */
97
98static void eeh_report_error(struct pci_dev *dev, void *userdata)
99{
100 enum pcierr_result rc, *res = userdata;
101 struct pci_driver *driver = dev->driver;
102
103 dev->error_state = pci_channel_io_frozen;
104
105 if (!driver)
106 return;
107
108 if (irq_in_use (dev->irq)) {
109 struct device_node *dn = pci_device_to_OF_node(dev);
110 PCI_DN(dn)->eeh_mode |= EEH_MODE_IRQ_DISABLED;
111 disable_irq_nosync(dev->irq);
112 }
113 if (!driver->err_handler)
114 return;
115 if (!driver->err_handler->error_detected)
116 return;
117
118 rc = driver->err_handler->error_detected (dev, pci_channel_io_frozen);
119 if (*res == PCIERR_RESULT_NONE) *res = rc;
120 if (*res == PCIERR_RESULT_NEED_RESET) return;
121 if (*res == PCIERR_RESULT_DISCONNECT &&
122 rc == PCIERR_RESULT_NEED_RESET) *res = rc;
123}
124
125/** eeh_report_reset -- tell this device that the pci slot
126 * has been reset.
127 */
128
129static void eeh_report_reset(struct pci_dev *dev, void *userdata)
130{
131 struct pci_driver *driver = dev->driver;
132 struct device_node *dn = pci_device_to_OF_node(dev);
133
134 if (!driver)
135 return;
136
137 if ((PCI_DN(dn)->eeh_mode) & EEH_MODE_IRQ_DISABLED) {
138 PCI_DN(dn)->eeh_mode &= ~EEH_MODE_IRQ_DISABLED;
139 enable_irq(dev->irq);
140 }
141 if (!driver->err_handler)
142 return;
143 if (!driver->err_handler->slot_reset)
144 return;
145
146 driver->err_handler->slot_reset(dev);
147}
148
149static void eeh_report_resume(struct pci_dev *dev, void *userdata)
150{
151 struct pci_driver *driver = dev->driver;
152
153 dev->error_state = pci_channel_io_normal;
154
155 if (!driver)
156 return;
157 if (!driver->err_handler)
158 return;
159 if (!driver->err_handler->resume)
160 return;
161
162 driver->err_handler->resume(dev);
163}
164
165static void eeh_report_failure(struct pci_dev *dev, void *userdata)
166{
167 struct pci_driver *driver = dev->driver;
168
169 dev->error_state = pci_channel_io_perm_failure;
170
171 if (!driver)
172 return;
173
174 if (irq_in_use (dev->irq)) {
175 struct device_node *dn = pci_device_to_OF_node(dev);
176 PCI_DN(dn)->eeh_mode |= EEH_MODE_IRQ_DISABLED;
177 disable_irq_nosync(dev->irq);
178 }
179 if (!driver->err_handler)
180 return;
181 if (!driver->err_handler->error_detected)
182 return;
183 driver->err_handler->error_detected(dev, pci_channel_io_perm_failure);
184}
185
186/* ------------------------------------------------------- */
187/**
188 * handle_eeh_events -- reset a PCI device after hard lockup.
189 *
190 * pSeries systems will isolate a PCI slot if the PCI-Host
191 * bridge detects address or data parity errors, DMA's
192 * occuring to wild addresses (which usually happen due to
193 * bugs in device drivers or in PCI adapter firmware).
194 * Slot isolations also occur if #SERR, #PERR or other misc
195 * PCI-related errors are detected.
196 *
197 * Recovery process consists of unplugging the device driver
198 * (which generated hotplug events to userspace), then issuing
199 * a PCI #RST to the device, then reconfiguring the PCI config
200 * space for all bridges & devices under this slot, and then
201 * finally restarting the device drivers (which cause a second
202 * set of hotplug events to go out to userspace).
203 */
204
205/**
206 * eeh_reset_device() -- perform actual reset of a pci slot
207 * Args: bus: pointer to the pci bus structure corresponding
208 * to the isolated slot. A non-null value will
209 * cause all devices under the bus to be removed
210 * and then re-added.
211 * pe_dn: pointer to a "Partionable Endpoint" device node.
212 * This is the top-level structure on which pci
213 * bus resets can be performed.
214 */
215
216static void eeh_reset_device (struct pci_dn *pe_dn, struct pci_bus *bus)
217{
218 if (bus)
219 pcibios_remove_pci_devices(bus);
220
221 /* Reset the pci controller. (Asserts RST#; resets config space).
222 * Reconfigure bridges and devices */
223 rtas_set_slot_reset(pe_dn);
224
225 /* Walk over all functions on this device */
226 rtas_configure_bridge(pe_dn);
227 eeh_restore_bars(pe_dn);
228
229 /* Give the system 5 seconds to finish running the user-space
230 * hotplug shutdown scripts, e.g. ifdown for ethernet. Yes,
231 * this is a hack, but if we don't do this, and try to bring
232 * the device up before the scripts have taken it down,
233 * potentially weird things happen.
234 */
235 if (bus) {
236 ssleep (5);
237 pcibios_add_pci_devices(bus);
238 }
239}
240
241/* The longest amount of time to wait for a pci device
242 * to come back on line, in seconds.
243 */
244#define MAX_WAIT_FOR_RECOVERY 15
245
246void handle_eeh_events (struct eeh_event *event)
247{
248 struct device_node *frozen_dn;
249 struct pci_dn *frozen_pdn;
250 struct pci_bus *frozen_bus;
251 int perm_failure = 0;
252
253 frozen_dn = find_device_pe(event->dn);
254 frozen_bus = pcibios_find_pci_bus(frozen_dn);
255
256 if (!frozen_dn) {
257 printk(KERN_ERR "EEH: Error: Cannot find partition endpoint for %s\n",
258 pci_name(event->dev));
259 return;
260 }
261
262 /* There are two different styles for coming up with the PE.
263 * In the old style, it was the highest EEH-capable device
264 * which was always an EADS pci bridge. In the new style,
265 * there might not be any EADS bridges, and even when there are,
266 * the firmware marks them as "EEH incapable". So another
267 * two-step is needed to find the pci bus.. */
268 if (!frozen_bus)
269 frozen_bus = pcibios_find_pci_bus (frozen_dn->parent);
270
271 if (!frozen_bus) {
272 printk(KERN_ERR "EEH: Cannot find PCI bus for %s\n",
273 frozen_dn->full_name);
274 return;
275 }
276
277#if 0
278 /* We may get "permanent failure" messages on empty slots.
279 * These are false alarms. Empty slots have no child dn. */
280 if ((event->state == pci_channel_io_perm_failure) && (frozen_device == NULL))
281 return;
282#endif
283
284 frozen_pdn = PCI_DN(frozen_dn);
285 frozen_pdn->eeh_freeze_count++;
286
287 if (frozen_pdn->eeh_freeze_count > EEH_MAX_ALLOWED_FREEZES)
288 perm_failure = 1;
289
290 /* If the reset state is a '5' and the time to reset is 0 (infinity)
291 * or is more then 15 seconds, then mark this as a permanent failure.
292 */
293 if ((event->state == pci_channel_io_perm_failure) &&
294 ((event->time_unavail <= 0) ||
295 (event->time_unavail > MAX_WAIT_FOR_RECOVERY*1000)))
296 {
297 perm_failure = 1;
298 }
299
300 /* Log the error with the rtas logger. */
301 if (perm_failure) {
302 /*
303 * About 90% of all real-life EEH failures in the field
304 * are due to poorly seated PCI cards. Only 10% or so are
305 * due to actual, failed cards.
306 */
307 printk(KERN_ERR
308 "EEH: PCI device %s - %s has failed %d times \n"
309 "and has been permanently disabled. Please try reseating\n"
310 "this device or replacing it.\n",
311 pci_name (frozen_pdn->pcidev),
312 pcid_name(frozen_pdn->pcidev),
313 frozen_pdn->eeh_freeze_count);
314
315 eeh_slot_error_detail(frozen_pdn, 2 /* Permanent Error */);
316
317 /* Notify all devices that they're about to go down. */
318 pci_walk_bus(frozen_bus, eeh_report_failure, 0);
319
320 /* Shut down the device drivers for good. */
321 pcibios_remove_pci_devices(frozen_bus);
322 return;
323 }
324
325 eeh_slot_error_detail(frozen_pdn, 1 /* Temporary Error */);
326 printk(KERN_WARNING
327 "EEH: This PCI device has failed %d times since last reboot: %s - %s\n",
328 frozen_pdn->eeh_freeze_count,
329 pci_name (frozen_pdn->pcidev),
330 pcid_name(frozen_pdn->pcidev));
331
332 /* Walk the various device drivers attached to this slot through
333 * a reset sequence, giving each an opportunity to do what it needs
334 * to accomplish the reset. Each child gets a report of the
335 * status ... if any child can't handle the reset, then the entire
336 * slot is dlpar removed and added.
337 */
338 enum pcierr_result result = PCIERR_RESULT_NONE;
339 pci_walk_bus(frozen_bus, eeh_report_error, &result);
340
341 /* If all device drivers were EEH-unaware, then shut
342 * down all of the device drivers, and hope they
343 * go down willingly, without panicing the system.
344 */
345 if (result == PCIERR_RESULT_NONE) {
346 eeh_reset_device(frozen_pdn, frozen_bus);
347 }
348
349 /* If any device called out for a reset, then reset the slot */
350 if (result == PCIERR_RESULT_NEED_RESET) {
351 eeh_reset_device(frozen_pdn, NULL);
352 pci_walk_bus(frozen_bus, eeh_report_reset, 0);
353 }
354
355 /* If all devices reported they can proceed, the re-enable PIO */
356 if (result == PCIERR_RESULT_CAN_RECOVER) {
357 /* XXX Not supported; we brute-force reset the device */
358 eeh_reset_device(frozen_pdn, NULL);
359 pci_walk_bus(frozen_bus, eeh_report_reset, 0);
360 }
361
362 /* Tell all device drivers that they can resume operations */
363 pci_walk_bus(frozen_bus, eeh_report_resume, 0);
364}
365
366/* ---------- end of file ---------- */
diff --git a/arch/powerpc/platforms/pseries/eeh_event.c b/arch/powerpc/platforms/pseries/eeh_event.c
index 92497333c2b6..9a9961f27480 100644
--- a/arch/powerpc/platforms/pseries/eeh_event.c
+++ b/arch/powerpc/platforms/pseries/eeh_event.c
@@ -21,6 +21,7 @@
21#include <linux/list.h> 21#include <linux/list.h>
22#include <linux/pci.h> 22#include <linux/pci.h>
23#include <asm/eeh_event.h> 23#include <asm/eeh_event.h>
24#include <asm/ppc-pci.h>
24 25
25/** Overview: 26/** Overview:
26 * EEH error states may be detected within exception handlers; 27 * EEH error states may be detected within exception handlers;
@@ -37,31 +38,6 @@ static void eeh_thread_launcher(void *);
37DECLARE_WORK(eeh_event_wq, eeh_thread_launcher, NULL); 38DECLARE_WORK(eeh_event_wq, eeh_thread_launcher, NULL);
38 39
39/** 40/**
40 * eeh_panic - call panic() for an eeh event that cannot be handled.
41 * The philosophy of this routine is that it is better to panic and
42 * halt the OS than it is to risk possible data corruption by
43 * oblivious device drivers that don't know better.
44 *
45 * @dev pci device that had an eeh event
46 * @reset_state current reset state of the device slot
47 */
48static void eeh_panic(struct pci_dev *dev, int reset_state)
49{
50 /*
51 * Since the panic_on_oops sysctl is used to halt the system
52 * in light of potential corruption, we can use it here.
53 */
54 if (panic_on_oops) {
55 panic("EEH: MMIO failure (%d) on device:%s\n", reset_state,
56 pci_name(dev));
57 }
58 else {
59 printk(KERN_INFO "EEH: Ignored MMIO failure (%d) on device:%s\n",
60 reset_state, pci_name(dev));
61 }
62}
63
64/**
65 * eeh_event_handler - dispatch EEH events. The detection of a frozen 41 * eeh_event_handler - dispatch EEH events. The detection of a frozen
66 * slot can occur inside an interrupt, where it can be hard to do 42 * slot can occur inside an interrupt, where it can be hard to do
67 * anything about it. The goal of this routine is to pull these 43 * anything about it. The goal of this routine is to pull these
@@ -82,10 +58,16 @@ static int eeh_event_handler(void * dummy)
82 58
83 spin_lock_irqsave(&eeh_eventlist_lock, flags); 59 spin_lock_irqsave(&eeh_eventlist_lock, flags);
84 event = NULL; 60 event = NULL;
61
62 /* Unqueue the event, get ready to process. */
85 if (!list_empty(&eeh_eventlist)) { 63 if (!list_empty(&eeh_eventlist)) {
86 event = list_entry(eeh_eventlist.next, struct eeh_event, list); 64 event = list_entry(eeh_eventlist.next, struct eeh_event, list);
87 list_del(&event->list); 65 list_del(&event->list);
88 } 66 }
67
68 if (event)
69 eeh_mark_slot(event->dn, EEH_MODE_RECOVERING);
70
89 spin_unlock_irqrestore(&eeh_eventlist_lock, flags); 71 spin_unlock_irqrestore(&eeh_eventlist_lock, flags);
90 if (event == NULL) 72 if (event == NULL)
91 break; 73 break;
@@ -93,8 +75,11 @@ static int eeh_event_handler(void * dummy)
93 printk(KERN_INFO "EEH: Detected PCI bus error on device %s\n", 75 printk(KERN_INFO "EEH: Detected PCI bus error on device %s\n",
94 pci_name(event->dev)); 76 pci_name(event->dev));
95 77
96 eeh_panic (event->dev, event->state); 78 handle_eeh_events(event);
79
80 eeh_clear_slot(event->dn, EEH_MODE_RECOVERING);
97 81
82 pci_dev_put(event->dev);
98 kfree(event); 83 kfree(event);
99 } 84 }
100 85
@@ -122,7 +107,7 @@ static void eeh_thread_launcher(void *dummy)
122 */ 107 */
123int eeh_send_failure_event (struct device_node *dn, 108int eeh_send_failure_event (struct device_node *dn,
124 struct pci_dev *dev, 109 struct pci_dev *dev,
125 int state, 110 enum pci_channel_state state,
126 int time_unavail) 111 int time_unavail)
127{ 112{
128 unsigned long flags; 113 unsigned long flags;