Linas Vepstas | 77bd741 | 2005-11-03 18:52:49 -0600 | [diff] [blame] | 1 | /* |
| 2 | * PCI Error Recovery Driver for RPA-compliant PPC64 platform. |
Linas Vepstas | 3c8c90a | 2007-05-24 03:28:01 +1000 | [diff] [blame] | 3 | * Copyright IBM Corp. 2004 2005 |
| 4 | * Copyright Linas Vepstas <linas@linas.org> 2004, 2005 |
Linas Vepstas | 77bd741 | 2005-11-03 18:52:49 -0600 | [diff] [blame] | 5 | * |
| 6 | * All rights reserved. |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or modify |
| 9 | * it under the terms of the GNU General Public License as published by |
| 10 | * the Free Software Foundation; either version 2 of the License, or (at |
| 11 | * your option) any later version. |
| 12 | * |
| 13 | * This program is distributed in the hope that it will be useful, but |
| 14 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 | * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or |
| 16 | * NON INFRINGEMENT. See the GNU General Public License for more |
| 17 | * details. |
| 18 | * |
| 19 | * You should have received a copy of the GNU General Public License |
| 20 | * along with this program; if not, write to the Free Software |
| 21 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
| 22 | * |
Linas Vepstas | 3c8c90a | 2007-05-24 03:28:01 +1000 | [diff] [blame] | 23 | * Send comments and feedback to Linas Vepstas <linas@austin.ibm.com> |
Linas Vepstas | 77bd741 | 2005-11-03 18:52:49 -0600 | [diff] [blame] | 24 | */ |
| 25 | #include <linux/delay.h> |
Linas Vepstas | 77bd741 | 2005-11-03 18:52:49 -0600 | [diff] [blame] | 26 | #include <linux/interrupt.h> |
Linas Vepstas | ac325ac | 2006-04-18 21:05:21 -0700 | [diff] [blame] | 27 | #include <linux/irq.h> |
Gavin Shan | feadf7c | 2012-09-17 04:34:27 +0000 | [diff] [blame] | 28 | #include <linux/module.h> |
Linas Vepstas | 77bd741 | 2005-11-03 18:52:49 -0600 | [diff] [blame] | 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 | |
Gavin Shan | 29f8bf1 | 2012-02-27 20:04:02 +0000 | [diff] [blame] | 37 | /** |
| 38 | * eeh_pcid_name - Retrieve name of PCI device driver |
| 39 | * @pdev: PCI device |
| 40 | * |
| 41 | * This routine is used to retrieve the name of PCI device driver |
| 42 | * if that's valid. |
| 43 | */ |
Gavin Shan | 40a7cd9 | 2012-02-27 20:04:08 +0000 | [diff] [blame] | 44 | static inline const char *eeh_pcid_name(struct pci_dev *pdev) |
Linas Vepstas | 77bd741 | 2005-11-03 18:52:49 -0600 | [diff] [blame] | 45 | { |
Olaf Hering | 273d280 | 2006-02-27 15:52:59 +0100 | [diff] [blame] | 46 | if (pdev && pdev->dev.driver) |
Linas Vepstas | 77bd741 | 2005-11-03 18:52:49 -0600 | [diff] [blame] | 47 | return pdev->dev.driver->name; |
| 48 | return ""; |
| 49 | } |
| 50 | |
Gavin Shan | feadf7c | 2012-09-17 04:34:27 +0000 | [diff] [blame] | 51 | /** |
| 52 | * eeh_pcid_get - Get the PCI device driver |
| 53 | * @pdev: PCI device |
| 54 | * |
| 55 | * The function is used to retrieve the PCI device driver for |
| 56 | * the indicated PCI device. Besides, we will increase the reference |
| 57 | * of the PCI device driver to prevent that being unloaded on |
| 58 | * the fly. Otherwise, kernel crash would be seen. |
| 59 | */ |
| 60 | static inline struct pci_driver *eeh_pcid_get(struct pci_dev *pdev) |
| 61 | { |
| 62 | if (!pdev || !pdev->driver) |
| 63 | return NULL; |
| 64 | |
| 65 | if (!try_module_get(pdev->driver->driver.owner)) |
| 66 | return NULL; |
| 67 | |
| 68 | return pdev->driver; |
| 69 | } |
| 70 | |
| 71 | /** |
| 72 | * eeh_pcid_put - Dereference on the PCI device driver |
| 73 | * @pdev: PCI device |
| 74 | * |
| 75 | * The function is called to do dereference on the PCI device |
| 76 | * driver of the indicated PCI device. |
| 77 | */ |
| 78 | static inline void eeh_pcid_put(struct pci_dev *pdev) |
| 79 | { |
| 80 | if (!pdev || !pdev->driver) |
| 81 | return; |
| 82 | |
| 83 | module_put(pdev->driver->driver.owner); |
| 84 | } |
| 85 | |
Tony Breeds | dcfcfe7 | 2008-07-31 16:54:20 +1000 | [diff] [blame] | 86 | #if 0 |
Andrew Morton | 8e01520 | 2008-06-10 09:26:10 +1000 | [diff] [blame] | 87 | static void print_device_node_tree(struct pci_dn *pdn, int dent) |
Linas Vepstas | 77bd741 | 2005-11-03 18:52:49 -0600 | [diff] [blame] | 88 | { |
| 89 | int i; |
Andrew Morton | 8e01520 | 2008-06-10 09:26:10 +1000 | [diff] [blame] | 90 | struct device_node *pc; |
| 91 | |
| 92 | if (!pdn) |
| 93 | return; |
| 94 | for (i = 0; i < dent; i++) |
Linas Vepstas | 77bd741 | 2005-11-03 18:52:49 -0600 | [diff] [blame] | 95 | printk(" "); |
| 96 | printk("dn=%s mode=%x \tcfg_addr=%x pe_addr=%x \tfull=%s\n", |
| 97 | pdn->node->name, pdn->eeh_mode, pdn->eeh_config_addr, |
| 98 | pdn->eeh_pe_config_addr, pdn->node->full_name); |
| 99 | dent += 3; |
Andrew Morton | 8e01520 | 2008-06-10 09:26:10 +1000 | [diff] [blame] | 100 | pc = pdn->node->child; |
Linas Vepstas | 77bd741 | 2005-11-03 18:52:49 -0600 | [diff] [blame] | 101 | while (pc) { |
| 102 | print_device_node_tree(PCI_DN(pc), dent); |
| 103 | pc = pc->sibling; |
| 104 | } |
| 105 | } |
| 106 | #endif |
| 107 | |
Mike Mason | 8535ef0 | 2009-02-10 11:12:21 +0000 | [diff] [blame] | 108 | /** |
Gavin Shan | 29f8bf1 | 2012-02-27 20:04:02 +0000 | [diff] [blame] | 109 | * eeh_disable_irq - Disable interrupt for the recovering device |
| 110 | * @dev: PCI device |
| 111 | * |
| 112 | * This routine must be called when reporting temporary or permanent |
| 113 | * error to the particular PCI device to disable interrupt of that |
| 114 | * device. If the device has enabled MSI or MSI-X interrupt, we needn't |
| 115 | * do real work because EEH should freeze DMA transfers for those PCI |
| 116 | * devices encountering EEH errors, which includes MSI or MSI-X. |
Mike Mason | 8535ef0 | 2009-02-10 11:12:21 +0000 | [diff] [blame] | 117 | */ |
| 118 | static void eeh_disable_irq(struct pci_dev *dev) |
| 119 | { |
Gavin Shan | 40a7cd9 | 2012-02-27 20:04:08 +0000 | [diff] [blame] | 120 | struct eeh_dev *edev = pci_dev_to_eeh_dev(dev); |
Mike Mason | 8535ef0 | 2009-02-10 11:12:21 +0000 | [diff] [blame] | 121 | |
| 122 | /* Don't disable MSI and MSI-X interrupts. They are |
| 123 | * effectively disabled by the DMA Stopped state |
| 124 | * when an EEH error occurs. |
Gavin Shan | 29f8bf1 | 2012-02-27 20:04:02 +0000 | [diff] [blame] | 125 | */ |
Mike Mason | 8535ef0 | 2009-02-10 11:12:21 +0000 | [diff] [blame] | 126 | if (dev->msi_enabled || dev->msix_enabled) |
| 127 | return; |
| 128 | |
Michael Ellerman | 59e3f83 | 2009-10-13 19:44:47 +0000 | [diff] [blame] | 129 | if (!irq_has_action(dev->irq)) |
Mike Mason | 8535ef0 | 2009-02-10 11:12:21 +0000 | [diff] [blame] | 130 | return; |
| 131 | |
Gavin Shan | dbbceee | 2012-09-07 22:44:20 +0000 | [diff] [blame] | 132 | edev->mode |= EEH_DEV_IRQ_DISABLED; |
Mike Mason | 8535ef0 | 2009-02-10 11:12:21 +0000 | [diff] [blame] | 133 | disable_irq_nosync(dev->irq); |
| 134 | } |
| 135 | |
| 136 | /** |
Gavin Shan | 29f8bf1 | 2012-02-27 20:04:02 +0000 | [diff] [blame] | 137 | * eeh_enable_irq - Enable interrupt for the recovering device |
| 138 | * @dev: PCI device |
| 139 | * |
| 140 | * This routine must be called to enable interrupt while failed |
| 141 | * device could be resumed. |
Mike Mason | 8535ef0 | 2009-02-10 11:12:21 +0000 | [diff] [blame] | 142 | */ |
| 143 | static void eeh_enable_irq(struct pci_dev *dev) |
| 144 | { |
Gavin Shan | 40a7cd9 | 2012-02-27 20:04:08 +0000 | [diff] [blame] | 145 | struct eeh_dev *edev = pci_dev_to_eeh_dev(dev); |
Mike Mason | 8535ef0 | 2009-02-10 11:12:21 +0000 | [diff] [blame] | 146 | |
Gavin Shan | dbbceee | 2012-09-07 22:44:20 +0000 | [diff] [blame] | 147 | if ((edev->mode) & EEH_DEV_IRQ_DISABLED) { |
| 148 | edev->mode &= ~EEH_DEV_IRQ_DISABLED; |
Thomas Gleixner | b8a9a11 | 2014-02-23 21:40:09 +0000 | [diff] [blame] | 149 | /* |
| 150 | * FIXME !!!!! |
| 151 | * |
| 152 | * This is just ass backwards. This maze has |
| 153 | * unbalanced irq_enable/disable calls. So instead of |
| 154 | * finding the root cause it works around the warning |
| 155 | * in the irq_enable code by conditionally calling |
| 156 | * into it. |
| 157 | * |
| 158 | * That's just wrong.The warning in the core code is |
| 159 | * there to tell people to fix their assymetries in |
| 160 | * their own code, not by abusing the core information |
| 161 | * to avoid it. |
| 162 | * |
| 163 | * I so wish that the assymetry would be the other way |
| 164 | * round and a few more irq_disable calls render that |
| 165 | * shit unusable forever. |
| 166 | * |
| 167 | * tglx |
| 168 | */ |
Thomas Gleixner | 57310c3 | 2014-03-05 00:06:11 +0100 | [diff] [blame] | 169 | if (irqd_irq_disabled(irq_get_irq_data(dev->irq))) |
Gavin Shan | 91150af | 2013-07-24 10:25:00 +0800 | [diff] [blame] | 170 | enable_irq(dev->irq); |
Thomas Gleixner | 57310c3 | 2014-03-05 00:06:11 +0100 | [diff] [blame] | 171 | } |
Mike Mason | 8535ef0 | 2009-02-10 11:12:21 +0000 | [diff] [blame] | 172 | } |
| 173 | |
Linas Vepstas | cb5b5624 | 2006-09-15 18:56:35 -0500 | [diff] [blame] | 174 | /** |
Gavin Shan | 29f8bf1 | 2012-02-27 20:04:02 +0000 | [diff] [blame] | 175 | * eeh_report_error - Report pci error to each device driver |
Gavin Shan | 9b3c76f | 2012-09-07 22:44:19 +0000 | [diff] [blame] | 176 | * @data: eeh device |
Gavin Shan | 29f8bf1 | 2012-02-27 20:04:02 +0000 | [diff] [blame] | 177 | * @userdata: return value |
Gavin Shan | a84f273 | 2013-06-20 13:20:51 +0800 | [diff] [blame] | 178 | * |
| 179 | * Report an EEH error to each device driver, collect up and |
| 180 | * merge the device driver responses. Cumulative response |
Linas Vepstas | cb5b5624 | 2006-09-15 18:56:35 -0500 | [diff] [blame] | 181 | * passed back in "userdata". |
Linas Vepstas | 77bd741 | 2005-11-03 18:52:49 -0600 | [diff] [blame] | 182 | */ |
Gavin Shan | 9b3c76f | 2012-09-07 22:44:19 +0000 | [diff] [blame] | 183 | static void *eeh_report_error(void *data, void *userdata) |
Linas Vepstas | 77bd741 | 2005-11-03 18:52:49 -0600 | [diff] [blame] | 184 | { |
Gavin Shan | 9b3c76f | 2012-09-07 22:44:19 +0000 | [diff] [blame] | 185 | struct eeh_dev *edev = (struct eeh_dev *)data; |
| 186 | struct pci_dev *dev = eeh_dev_to_pci_dev(edev); |
Paul Mackerras | 18eb3b3 | 2005-11-29 17:17:02 +1100 | [diff] [blame] | 187 | enum pci_ers_result rc, *res = userdata; |
Gavin Shan | feadf7c | 2012-09-17 04:34:27 +0000 | [diff] [blame] | 188 | struct pci_driver *driver; |
Linas Vepstas | 77bd741 | 2005-11-03 18:52:49 -0600 | [diff] [blame] | 189 | |
Gavin Shan | 9b3c76f | 2012-09-07 22:44:19 +0000 | [diff] [blame] | 190 | /* We might not have the associated PCI device, |
| 191 | * then we should continue for next one. |
| 192 | */ |
| 193 | if (!dev) return NULL; |
Linas Vepstas | 77bd741 | 2005-11-03 18:52:49 -0600 | [diff] [blame] | 194 | dev->error_state = pci_channel_io_frozen; |
| 195 | |
Gavin Shan | feadf7c | 2012-09-17 04:34:27 +0000 | [diff] [blame] | 196 | driver = eeh_pcid_get(dev); |
| 197 | if (!driver) return NULL; |
Linas Vepstas | 77bd741 | 2005-11-03 18:52:49 -0600 | [diff] [blame] | 198 | |
Mike Mason | 8535ef0 | 2009-02-10 11:12:21 +0000 | [diff] [blame] | 199 | eeh_disable_irq(dev); |
| 200 | |
Linas Vepstas | 6a1ca37 | 2006-09-15 18:58:59 -0500 | [diff] [blame] | 201 | if (!driver->err_handler || |
Gavin Shan | feadf7c | 2012-09-17 04:34:27 +0000 | [diff] [blame] | 202 | !driver->err_handler->error_detected) { |
| 203 | eeh_pcid_put(dev); |
Gavin Shan | 9b3c76f | 2012-09-07 22:44:19 +0000 | [diff] [blame] | 204 | return NULL; |
Gavin Shan | feadf7c | 2012-09-17 04:34:27 +0000 | [diff] [blame] | 205 | } |
Linas Vepstas | 77bd741 | 2005-11-03 18:52:49 -0600 | [diff] [blame] | 206 | |
Gavin Shan | 29f8bf1 | 2012-02-27 20:04:02 +0000 | [diff] [blame] | 207 | rc = driver->err_handler->error_detected(dev, pci_channel_io_frozen); |
Linas Vepstas | 2a50f14 | 2007-11-03 07:27:50 +1100 | [diff] [blame] | 208 | |
| 209 | /* A driver that needs a reset trumps all others */ |
| 210 | if (rc == PCI_ERS_RESULT_NEED_RESET) *res = rc; |
Paul Mackerras | 18eb3b3 | 2005-11-29 17:17:02 +1100 | [diff] [blame] | 211 | if (*res == PCI_ERS_RESULT_NONE) *res = rc; |
Zhang, Yanmin | 70298c6 | 2009-06-16 13:34:38 +0800 | [diff] [blame] | 212 | |
Gavin Shan | feadf7c | 2012-09-17 04:34:27 +0000 | [diff] [blame] | 213 | eeh_pcid_put(dev); |
Gavin Shan | 9b3c76f | 2012-09-07 22:44:19 +0000 | [diff] [blame] | 214 | return NULL; |
Linas Vepstas | 6a1ca37 | 2006-09-15 18:58:59 -0500 | [diff] [blame] | 215 | } |
| 216 | |
| 217 | /** |
Gavin Shan | 29f8bf1 | 2012-02-27 20:04:02 +0000 | [diff] [blame] | 218 | * eeh_report_mmio_enabled - Tell drivers that MMIO has been enabled |
Gavin Shan | 9b3c76f | 2012-09-07 22:44:19 +0000 | [diff] [blame] | 219 | * @data: eeh device |
Gavin Shan | 29f8bf1 | 2012-02-27 20:04:02 +0000 | [diff] [blame] | 220 | * @userdata: return value |
Linas Vepstas | 6a1ca37 | 2006-09-15 18:58:59 -0500 | [diff] [blame] | 221 | * |
Linas Vepstas | 638799b | 2007-11-03 07:25:55 +1100 | [diff] [blame] | 222 | * Tells each device driver that IO ports, MMIO and config space I/O |
| 223 | * are now enabled. Collects up and merges the device driver responses. |
| 224 | * Cumulative response passed back in "userdata". |
Linas Vepstas | 6a1ca37 | 2006-09-15 18:58:59 -0500 | [diff] [blame] | 225 | */ |
Gavin Shan | 9b3c76f | 2012-09-07 22:44:19 +0000 | [diff] [blame] | 226 | static void *eeh_report_mmio_enabled(void *data, void *userdata) |
Linas Vepstas | 6a1ca37 | 2006-09-15 18:58:59 -0500 | [diff] [blame] | 227 | { |
Gavin Shan | 9b3c76f | 2012-09-07 22:44:19 +0000 | [diff] [blame] | 228 | struct eeh_dev *edev = (struct eeh_dev *)data; |
| 229 | struct pci_dev *dev = eeh_dev_to_pci_dev(edev); |
Linas Vepstas | 6a1ca37 | 2006-09-15 18:58:59 -0500 | [diff] [blame] | 230 | enum pci_ers_result rc, *res = userdata; |
Gavin Shan | 9b3c76f | 2012-09-07 22:44:19 +0000 | [diff] [blame] | 231 | struct pci_driver *driver; |
Linas Vepstas | 6a1ca37 | 2006-09-15 18:58:59 -0500 | [diff] [blame] | 232 | |
Gavin Shan | feadf7c | 2012-09-17 04:34:27 +0000 | [diff] [blame] | 233 | driver = eeh_pcid_get(dev); |
| 234 | if (!driver) return NULL; |
Gavin Shan | 9b3c76f | 2012-09-07 22:44:19 +0000 | [diff] [blame] | 235 | |
Gavin Shan | feadf7c | 2012-09-17 04:34:27 +0000 | [diff] [blame] | 236 | if (!driver->err_handler || |
Gavin Shan | f26c7a0 | 2014-01-12 14:13:45 +0800 | [diff] [blame] | 237 | !driver->err_handler->mmio_enabled || |
| 238 | (edev->mode & EEH_DEV_NO_HANDLER)) { |
Gavin Shan | feadf7c | 2012-09-17 04:34:27 +0000 | [diff] [blame] | 239 | eeh_pcid_put(dev); |
Gavin Shan | 9b3c76f | 2012-09-07 22:44:19 +0000 | [diff] [blame] | 240 | return NULL; |
Gavin Shan | feadf7c | 2012-09-17 04:34:27 +0000 | [diff] [blame] | 241 | } |
Linas Vepstas | 6a1ca37 | 2006-09-15 18:58:59 -0500 | [diff] [blame] | 242 | |
Gavin Shan | 29f8bf1 | 2012-02-27 20:04:02 +0000 | [diff] [blame] | 243 | rc = driver->err_handler->mmio_enabled(dev); |
Linas Vepstas | 2a50f14 | 2007-11-03 07:27:50 +1100 | [diff] [blame] | 244 | |
| 245 | /* A driver that needs a reset trumps all others */ |
| 246 | if (rc == PCI_ERS_RESULT_NEED_RESET) *res = rc; |
Linas Vepstas | 6a1ca37 | 2006-09-15 18:58:59 -0500 | [diff] [blame] | 247 | if (*res == PCI_ERS_RESULT_NONE) *res = rc; |
Zhang, Yanmin | 70298c6 | 2009-06-16 13:34:38 +0800 | [diff] [blame] | 248 | |
Gavin Shan | feadf7c | 2012-09-17 04:34:27 +0000 | [diff] [blame] | 249 | eeh_pcid_put(dev); |
Gavin Shan | 9b3c76f | 2012-09-07 22:44:19 +0000 | [diff] [blame] | 250 | return NULL; |
Linas Vepstas | 77bd741 | 2005-11-03 18:52:49 -0600 | [diff] [blame] | 251 | } |
| 252 | |
Linas Vepstas | cb5b5624 | 2006-09-15 18:56:35 -0500 | [diff] [blame] | 253 | /** |
Gavin Shan | 29f8bf1 | 2012-02-27 20:04:02 +0000 | [diff] [blame] | 254 | * eeh_report_reset - Tell device that slot has been reset |
Gavin Shan | 9b3c76f | 2012-09-07 22:44:19 +0000 | [diff] [blame] | 255 | * @data: eeh device |
Gavin Shan | 29f8bf1 | 2012-02-27 20:04:02 +0000 | [diff] [blame] | 256 | * @userdata: return value |
| 257 | * |
| 258 | * This routine must be called while EEH tries to reset particular |
| 259 | * PCI device so that the associated PCI device driver could take |
| 260 | * some actions, usually to save data the driver needs so that the |
| 261 | * driver can work again while the device is recovered. |
Linas Vepstas | 77bd741 | 2005-11-03 18:52:49 -0600 | [diff] [blame] | 262 | */ |
Gavin Shan | 9b3c76f | 2012-09-07 22:44:19 +0000 | [diff] [blame] | 263 | static void *eeh_report_reset(void *data, void *userdata) |
Linas Vepstas | 77bd741 | 2005-11-03 18:52:49 -0600 | [diff] [blame] | 264 | { |
Gavin Shan | 9b3c76f | 2012-09-07 22:44:19 +0000 | [diff] [blame] | 265 | struct eeh_dev *edev = (struct eeh_dev *)data; |
| 266 | struct pci_dev *dev = eeh_dev_to_pci_dev(edev); |
Linas Vepstas | 6a1ca37 | 2006-09-15 18:58:59 -0500 | [diff] [blame] | 267 | enum pci_ers_result rc, *res = userdata; |
Gavin Shan | 9b3c76f | 2012-09-07 22:44:19 +0000 | [diff] [blame] | 268 | struct pci_driver *driver; |
Linas Vepstas | 77bd741 | 2005-11-03 18:52:49 -0600 | [diff] [blame] | 269 | |
Gavin Shan | feadf7c | 2012-09-17 04:34:27 +0000 | [diff] [blame] | 270 | if (!dev) return NULL; |
Mike Mason | c58dc57 | 2009-04-10 08:57:03 +0000 | [diff] [blame] | 271 | dev->error_state = pci_channel_io_normal; |
| 272 | |
Gavin Shan | feadf7c | 2012-09-17 04:34:27 +0000 | [diff] [blame] | 273 | driver = eeh_pcid_get(dev); |
| 274 | if (!driver) return NULL; |
| 275 | |
Mike Mason | 8535ef0 | 2009-02-10 11:12:21 +0000 | [diff] [blame] | 276 | eeh_enable_irq(dev); |
| 277 | |
Linas Vepstas | 6a1ca37 | 2006-09-15 18:58:59 -0500 | [diff] [blame] | 278 | if (!driver->err_handler || |
Gavin Shan | f26c7a0 | 2014-01-12 14:13:45 +0800 | [diff] [blame] | 279 | !driver->err_handler->slot_reset || |
| 280 | (edev->mode & EEH_DEV_NO_HANDLER)) { |
Gavin Shan | feadf7c | 2012-09-17 04:34:27 +0000 | [diff] [blame] | 281 | eeh_pcid_put(dev); |
Gavin Shan | 9b3c76f | 2012-09-07 22:44:19 +0000 | [diff] [blame] | 282 | return NULL; |
Gavin Shan | feadf7c | 2012-09-17 04:34:27 +0000 | [diff] [blame] | 283 | } |
Linas Vepstas | 77bd741 | 2005-11-03 18:52:49 -0600 | [diff] [blame] | 284 | |
Linas Vepstas | 6a1ca37 | 2006-09-15 18:58:59 -0500 | [diff] [blame] | 285 | rc = driver->err_handler->slot_reset(dev); |
Linas Vepstas | 5794dbc | 2007-03-19 14:55:51 -0500 | [diff] [blame] | 286 | if ((*res == PCI_ERS_RESULT_NONE) || |
| 287 | (*res == PCI_ERS_RESULT_RECOVERED)) *res = rc; |
Linas Vepstas | 6a1ca37 | 2006-09-15 18:58:59 -0500 | [diff] [blame] | 288 | if (*res == PCI_ERS_RESULT_DISCONNECT && |
| 289 | rc == PCI_ERS_RESULT_NEED_RESET) *res = rc; |
Zhang, Yanmin | 70298c6 | 2009-06-16 13:34:38 +0800 | [diff] [blame] | 290 | |
Gavin Shan | feadf7c | 2012-09-17 04:34:27 +0000 | [diff] [blame] | 291 | eeh_pcid_put(dev); |
Gavin Shan | 9b3c76f | 2012-09-07 22:44:19 +0000 | [diff] [blame] | 292 | return NULL; |
Linas Vepstas | 77bd741 | 2005-11-03 18:52:49 -0600 | [diff] [blame] | 293 | } |
| 294 | |
Linas Vepstas | cb5b5624 | 2006-09-15 18:56:35 -0500 | [diff] [blame] | 295 | /** |
Gavin Shan | 29f8bf1 | 2012-02-27 20:04:02 +0000 | [diff] [blame] | 296 | * eeh_report_resume - Tell device to resume normal operations |
Gavin Shan | 9b3c76f | 2012-09-07 22:44:19 +0000 | [diff] [blame] | 297 | * @data: eeh device |
Gavin Shan | 29f8bf1 | 2012-02-27 20:04:02 +0000 | [diff] [blame] | 298 | * @userdata: return value |
| 299 | * |
| 300 | * This routine must be called to notify the device driver that it |
| 301 | * could resume so that the device driver can do some initialization |
| 302 | * to make the recovered device work again. |
Linas Vepstas | cb5b5624 | 2006-09-15 18:56:35 -0500 | [diff] [blame] | 303 | */ |
Gavin Shan | 9b3c76f | 2012-09-07 22:44:19 +0000 | [diff] [blame] | 304 | static void *eeh_report_resume(void *data, void *userdata) |
Linas Vepstas | 77bd741 | 2005-11-03 18:52:49 -0600 | [diff] [blame] | 305 | { |
Gavin Shan | 9b3c76f | 2012-09-07 22:44:19 +0000 | [diff] [blame] | 306 | struct eeh_dev *edev = (struct eeh_dev *)data; |
| 307 | struct pci_dev *dev = eeh_dev_to_pci_dev(edev); |
| 308 | struct pci_driver *driver; |
| 309 | |
| 310 | if (!dev) return NULL; |
Linas Vepstas | 77bd741 | 2005-11-03 18:52:49 -0600 | [diff] [blame] | 311 | dev->error_state = pci_channel_io_normal; |
| 312 | |
Gavin Shan | feadf7c | 2012-09-17 04:34:27 +0000 | [diff] [blame] | 313 | driver = eeh_pcid_get(dev); |
| 314 | if (!driver) return NULL; |
Linas Vepstas | d0e7034 | 2006-12-06 12:32:20 -0600 | [diff] [blame] | 315 | |
Mike Mason | 8535ef0 | 2009-02-10 11:12:21 +0000 | [diff] [blame] | 316 | eeh_enable_irq(dev); |
| 317 | |
Linas Vepstas | d0e7034 | 2006-12-06 12:32:20 -0600 | [diff] [blame] | 318 | if (!driver->err_handler || |
Gavin Shan | f26c7a0 | 2014-01-12 14:13:45 +0800 | [diff] [blame] | 319 | !driver->err_handler->resume || |
| 320 | (edev->mode & EEH_DEV_NO_HANDLER)) { |
| 321 | edev->mode &= ~EEH_DEV_NO_HANDLER; |
Gavin Shan | feadf7c | 2012-09-17 04:34:27 +0000 | [diff] [blame] | 322 | eeh_pcid_put(dev); |
Gavin Shan | 9b3c76f | 2012-09-07 22:44:19 +0000 | [diff] [blame] | 323 | return NULL; |
Gavin Shan | feadf7c | 2012-09-17 04:34:27 +0000 | [diff] [blame] | 324 | } |
Linas Vepstas | 77bd741 | 2005-11-03 18:52:49 -0600 | [diff] [blame] | 325 | |
| 326 | driver->err_handler->resume(dev); |
Zhang, Yanmin | 70298c6 | 2009-06-16 13:34:38 +0800 | [diff] [blame] | 327 | |
Gavin Shan | feadf7c | 2012-09-17 04:34:27 +0000 | [diff] [blame] | 328 | eeh_pcid_put(dev); |
Gavin Shan | 9b3c76f | 2012-09-07 22:44:19 +0000 | [diff] [blame] | 329 | return NULL; |
Linas Vepstas | 77bd741 | 2005-11-03 18:52:49 -0600 | [diff] [blame] | 330 | } |
| 331 | |
Linas Vepstas | cb5b5624 | 2006-09-15 18:56:35 -0500 | [diff] [blame] | 332 | /** |
Gavin Shan | 29f8bf1 | 2012-02-27 20:04:02 +0000 | [diff] [blame] | 333 | * eeh_report_failure - Tell device driver that device is dead. |
Gavin Shan | 9b3c76f | 2012-09-07 22:44:19 +0000 | [diff] [blame] | 334 | * @data: eeh device |
Gavin Shan | 29f8bf1 | 2012-02-27 20:04:02 +0000 | [diff] [blame] | 335 | * @userdata: return value |
Linas Vepstas | cb5b5624 | 2006-09-15 18:56:35 -0500 | [diff] [blame] | 336 | * |
| 337 | * This informs the device driver that the device is permanently |
| 338 | * dead, and that no further recovery attempts will be made on it. |
| 339 | */ |
Gavin Shan | 9b3c76f | 2012-09-07 22:44:19 +0000 | [diff] [blame] | 340 | static void *eeh_report_failure(void *data, void *userdata) |
Linas Vepstas | 77bd741 | 2005-11-03 18:52:49 -0600 | [diff] [blame] | 341 | { |
Gavin Shan | 9b3c76f | 2012-09-07 22:44:19 +0000 | [diff] [blame] | 342 | struct eeh_dev *edev = (struct eeh_dev *)data; |
| 343 | struct pci_dev *dev = eeh_dev_to_pci_dev(edev); |
| 344 | struct pci_driver *driver; |
| 345 | |
| 346 | if (!dev) return NULL; |
Linas Vepstas | 77bd741 | 2005-11-03 18:52:49 -0600 | [diff] [blame] | 347 | dev->error_state = pci_channel_io_perm_failure; |
| 348 | |
Gavin Shan | feadf7c | 2012-09-17 04:34:27 +0000 | [diff] [blame] | 349 | driver = eeh_pcid_get(dev); |
| 350 | if (!driver) return NULL; |
Linas Vepstas | 77bd741 | 2005-11-03 18:52:49 -0600 | [diff] [blame] | 351 | |
Mike Mason | 8535ef0 | 2009-02-10 11:12:21 +0000 | [diff] [blame] | 352 | eeh_disable_irq(dev); |
| 353 | |
| 354 | if (!driver->err_handler || |
Gavin Shan | feadf7c | 2012-09-17 04:34:27 +0000 | [diff] [blame] | 355 | !driver->err_handler->error_detected) { |
| 356 | eeh_pcid_put(dev); |
Gavin Shan | 9b3c76f | 2012-09-07 22:44:19 +0000 | [diff] [blame] | 357 | return NULL; |
Gavin Shan | feadf7c | 2012-09-17 04:34:27 +0000 | [diff] [blame] | 358 | } |
Mike Mason | 8535ef0 | 2009-02-10 11:12:21 +0000 | [diff] [blame] | 359 | |
Linas Vepstas | 77bd741 | 2005-11-03 18:52:49 -0600 | [diff] [blame] | 360 | driver->err_handler->error_detected(dev, pci_channel_io_perm_failure); |
Zhang, Yanmin | 70298c6 | 2009-06-16 13:34:38 +0800 | [diff] [blame] | 361 | |
Gavin Shan | feadf7c | 2012-09-17 04:34:27 +0000 | [diff] [blame] | 362 | eeh_pcid_put(dev); |
Gavin Shan | 9b3c76f | 2012-09-07 22:44:19 +0000 | [diff] [blame] | 363 | return NULL; |
Linas Vepstas | 77bd741 | 2005-11-03 18:52:49 -0600 | [diff] [blame] | 364 | } |
| 365 | |
Gavin Shan | f5c5771 | 2013-07-24 10:24:58 +0800 | [diff] [blame] | 366 | static void *eeh_rmv_device(void *data, void *userdata) |
| 367 | { |
| 368 | struct pci_driver *driver; |
| 369 | struct eeh_dev *edev = (struct eeh_dev *)data; |
| 370 | struct pci_dev *dev = eeh_dev_to_pci_dev(edev); |
| 371 | int *removed = (int *)userdata; |
| 372 | |
| 373 | /* |
| 374 | * Actually, we should remove the PCI bridges as well. |
| 375 | * However, that's lots of complexity to do that, |
| 376 | * particularly some of devices under the bridge might |
| 377 | * support EEH. So we just care about PCI devices for |
| 378 | * simplicity here. |
| 379 | */ |
| 380 | if (!dev || (dev->hdr_type & PCI_HEADER_TYPE_BRIDGE)) |
| 381 | return NULL; |
Thadeu Lima de Souza Cascardo | 8cc6b6c | 2014-02-05 16:20:45 -0200 | [diff] [blame] | 382 | |
Gavin Shan | f5c5771 | 2013-07-24 10:24:58 +0800 | [diff] [blame] | 383 | driver = eeh_pcid_get(dev); |
Thadeu Lima de Souza Cascardo | 8cc6b6c | 2014-02-05 16:20:45 -0200 | [diff] [blame] | 384 | if (driver) { |
| 385 | eeh_pcid_put(dev); |
| 386 | if (driver->err_handler) |
| 387 | return NULL; |
| 388 | } |
Gavin Shan | f5c5771 | 2013-07-24 10:24:58 +0800 | [diff] [blame] | 389 | |
| 390 | /* Remove it from PCI subsystem */ |
| 391 | pr_debug("EEH: Removing %s without EEH sensitive driver\n", |
| 392 | pci_name(dev)); |
| 393 | edev->bus = dev->bus; |
| 394 | edev->mode |= EEH_DEV_DISCONNECTED; |
| 395 | (*removed)++; |
| 396 | |
Rafael J. Wysocki | 1c2042c | 2014-01-15 14:33:20 +0100 | [diff] [blame] | 397 | pci_lock_rescan_remove(); |
Gavin Shan | f5c5771 | 2013-07-24 10:24:58 +0800 | [diff] [blame] | 398 | pci_stop_and_remove_bus_device(dev); |
Rafael J. Wysocki | 1c2042c | 2014-01-15 14:33:20 +0100 | [diff] [blame] | 399 | pci_unlock_rescan_remove(); |
Gavin Shan | f5c5771 | 2013-07-24 10:24:58 +0800 | [diff] [blame] | 400 | |
| 401 | return NULL; |
| 402 | } |
| 403 | |
| 404 | static void *eeh_pe_detach_dev(void *data, void *userdata) |
| 405 | { |
| 406 | struct eeh_pe *pe = (struct eeh_pe *)data; |
| 407 | struct eeh_dev *edev, *tmp; |
| 408 | |
| 409 | eeh_pe_for_each_dev(pe, edev, tmp) { |
| 410 | if (!(edev->mode & EEH_DEV_DISCONNECTED)) |
| 411 | continue; |
| 412 | |
| 413 | edev->mode &= ~(EEH_DEV_DISCONNECTED | EEH_DEV_IRQ_DISABLED); |
| 414 | eeh_rmv_from_parent_pe(edev); |
| 415 | } |
| 416 | |
| 417 | return NULL; |
| 418 | } |
| 419 | |
Linas Vepstas | 77bd741 | 2005-11-03 18:52:49 -0600 | [diff] [blame] | 420 | /** |
Gavin Shan | 29f8bf1 | 2012-02-27 20:04:02 +0000 | [diff] [blame] | 421 | * eeh_reset_device - Perform actual reset of a pci slot |
Gavin Shan | 9b3c76f | 2012-09-07 22:44:19 +0000 | [diff] [blame] | 422 | * @pe: EEH PE |
Gavin Shan | 29f8bf1 | 2012-02-27 20:04:02 +0000 | [diff] [blame] | 423 | * @bus: PCI bus corresponding to the isolcated slot |
Linas Vepstas | 77bd741 | 2005-11-03 18:52:49 -0600 | [diff] [blame] | 424 | * |
Gavin Shan | 29f8bf1 | 2012-02-27 20:04:02 +0000 | [diff] [blame] | 425 | * This routine must be called to do reset on the indicated PE. |
| 426 | * During the reset, udev might be invoked because those affected |
| 427 | * PCI devices will be removed and then added. |
Linas Vepstas | 77bd741 | 2005-11-03 18:52:49 -0600 | [diff] [blame] | 428 | */ |
Gavin Shan | 9b3c76f | 2012-09-07 22:44:19 +0000 | [diff] [blame] | 429 | static int eeh_reset_device(struct eeh_pe *pe, struct pci_bus *bus) |
Linas Vepstas | 77bd741 | 2005-11-03 18:52:49 -0600 | [diff] [blame] | 430 | { |
Gavin Shan | f5c5771 | 2013-07-24 10:24:58 +0800 | [diff] [blame] | 431 | struct pci_bus *frozen_bus = eeh_pe_bus_get(pe); |
Gavin Shan | 5a71978 | 2013-06-20 13:21:01 +0800 | [diff] [blame] | 432 | struct timeval tstamp; |
Gavin Shan | f5c5771 | 2013-07-24 10:24:58 +0800 | [diff] [blame] | 433 | int cnt, rc, removed = 0; |
Linas Vepstas | 4240545 | 2006-04-28 17:39:38 -0500 | [diff] [blame] | 434 | |
| 435 | /* pcibios will clear the counter; save the value */ |
Gavin Shan | 9b3c76f | 2012-09-07 22:44:19 +0000 | [diff] [blame] | 436 | cnt = pe->freeze_count; |
Gavin Shan | 5a71978 | 2013-06-20 13:21:01 +0800 | [diff] [blame] | 437 | tstamp = pe->tstamp; |
Linas Vepstas | 4240545 | 2006-04-28 17:39:38 -0500 | [diff] [blame] | 438 | |
Gavin Shan | 20ee6a9 | 2012-09-11 19:16:17 +0000 | [diff] [blame] | 439 | /* |
| 440 | * We don't remove the corresponding PE instances because |
| 441 | * we need the information afterwords. The attached EEH |
| 442 | * devices are expected to be attached soon when calling |
| 443 | * into pcibios_add_pci_devices(). |
| 444 | */ |
Gavin Shan | f5c5771 | 2013-07-24 10:24:58 +0800 | [diff] [blame] | 445 | eeh_pe_state_mark(pe, EEH_PE_KEEP); |
Rafael J. Wysocki | 1c2042c | 2014-01-15 14:33:20 +0100 | [diff] [blame] | 446 | if (bus) { |
| 447 | pci_lock_rescan_remove(); |
Gavin Shan | 807a827 | 2013-07-24 10:24:55 +0800 | [diff] [blame] | 448 | pcibios_remove_pci_devices(bus); |
Rafael J. Wysocki | 1c2042c | 2014-01-15 14:33:20 +0100 | [diff] [blame] | 449 | pci_unlock_rescan_remove(); |
| 450 | } else if (frozen_bus) { |
Gavin Shan | f5c5771 | 2013-07-24 10:24:58 +0800 | [diff] [blame] | 451 | eeh_pe_dev_traverse(pe, eeh_rmv_device, &removed); |
Rafael J. Wysocki | 1c2042c | 2014-01-15 14:33:20 +0100 | [diff] [blame] | 452 | } |
Linas Vepstas | 77bd741 | 2005-11-03 18:52:49 -0600 | [diff] [blame] | 453 | |
| 454 | /* Reset the pci controller. (Asserts RST#; resets config space). |
Linas Vepstas | b6495c0 | 2005-11-03 18:54:54 -0600 | [diff] [blame] | 455 | * Reconfigure bridges and devices. Don't try to bring the system |
Gavin Shan | 29f8bf1 | 2012-02-27 20:04:02 +0000 | [diff] [blame] | 456 | * up if the reset failed for some reason. |
| 457 | */ |
Gavin Shan | 9b3c76f | 2012-09-07 22:44:19 +0000 | [diff] [blame] | 458 | rc = eeh_reset_pe(pe); |
Linas Vepstas | b6495c0 | 2005-11-03 18:54:54 -0600 | [diff] [blame] | 459 | if (rc) |
| 460 | return rc; |
Linas Vepstas | 77bd741 | 2005-11-03 18:52:49 -0600 | [diff] [blame] | 461 | |
Rafael J. Wysocki | 1c2042c | 2014-01-15 14:33:20 +0100 | [diff] [blame] | 462 | pci_lock_rescan_remove(); |
| 463 | |
Gavin Shan | 9b3c76f | 2012-09-07 22:44:19 +0000 | [diff] [blame] | 464 | /* Restore PE */ |
| 465 | eeh_ops->configure_bridge(pe); |
| 466 | eeh_pe_restore_bars(pe); |
Linas Vepstas | 77bd741 | 2005-11-03 18:52:49 -0600 | [diff] [blame] | 467 | |
| 468 | /* Give the system 5 seconds to finish running the user-space |
Gavin Shan | a84f273 | 2013-06-20 13:20:51 +0800 | [diff] [blame] | 469 | * hotplug shutdown scripts, e.g. ifdown for ethernet. Yes, |
| 470 | * this is a hack, but if we don't do this, and try to bring |
| 471 | * the device up before the scripts have taken it down, |
Linas Vepstas | 77bd741 | 2005-11-03 18:52:49 -0600 | [diff] [blame] | 472 | * potentially weird things happen. |
| 473 | */ |
| 474 | if (bus) { |
Gavin Shan | f5c5771 | 2013-07-24 10:24:58 +0800 | [diff] [blame] | 475 | pr_info("EEH: Sleep 5s ahead of complete hotplug\n"); |
Gavin Shan | 29f8bf1 | 2012-02-27 20:04:02 +0000 | [diff] [blame] | 476 | ssleep(5); |
Gavin Shan | f5c5771 | 2013-07-24 10:24:58 +0800 | [diff] [blame] | 477 | |
| 478 | /* |
| 479 | * The EEH device is still connected with its parent |
| 480 | * PE. We should disconnect it so the binding can be |
| 481 | * rebuilt when adding PCI devices. |
| 482 | */ |
| 483 | eeh_pe_traverse(pe, eeh_pe_detach_dev, NULL); |
Linas Vepstas | 77bd741 | 2005-11-03 18:52:49 -0600 | [diff] [blame] | 484 | pcibios_add_pci_devices(bus); |
Gavin Shan | f5c5771 | 2013-07-24 10:24:58 +0800 | [diff] [blame] | 485 | } else if (frozen_bus && removed) { |
| 486 | pr_info("EEH: Sleep 5s ahead of partial hotplug\n"); |
| 487 | ssleep(5); |
| 488 | |
| 489 | eeh_pe_traverse(pe, eeh_pe_detach_dev, NULL); |
| 490 | pcibios_add_pci_devices(frozen_bus); |
Linas Vepstas | 77bd741 | 2005-11-03 18:52:49 -0600 | [diff] [blame] | 491 | } |
Gavin Shan | f5c5771 | 2013-07-24 10:24:58 +0800 | [diff] [blame] | 492 | eeh_pe_state_clear(pe, EEH_PE_KEEP); |
Gavin Shan | 5a71978 | 2013-06-20 13:21:01 +0800 | [diff] [blame] | 493 | |
| 494 | pe->tstamp = tstamp; |
Gavin Shan | 9b3c76f | 2012-09-07 22:44:19 +0000 | [diff] [blame] | 495 | pe->freeze_count = cnt; |
Linas Vepstas | b6495c0 | 2005-11-03 18:54:54 -0600 | [diff] [blame] | 496 | |
Rafael J. Wysocki | 1c2042c | 2014-01-15 14:33:20 +0100 | [diff] [blame] | 497 | pci_unlock_rescan_remove(); |
Linas Vepstas | b6495c0 | 2005-11-03 18:54:54 -0600 | [diff] [blame] | 498 | return 0; |
Linas Vepstas | 77bd741 | 2005-11-03 18:52:49 -0600 | [diff] [blame] | 499 | } |
| 500 | |
| 501 | /* The longest amount of time to wait for a pci device |
| 502 | * to come back on line, in seconds. |
| 503 | */ |
Brian King | fb48dc2 | 2013-11-25 16:27:54 -0600 | [diff] [blame] | 504 | #define MAX_WAIT_FOR_RECOVERY 300 |
Linas Vepstas | 77bd741 | 2005-11-03 18:52:49 -0600 | [diff] [blame] | 505 | |
Gavin Shan | 8a6b1bc | 2013-06-20 13:21:04 +0800 | [diff] [blame] | 506 | static void eeh_handle_normal_event(struct eeh_pe *pe) |
Linas Vepstas | 77bd741 | 2005-11-03 18:52:49 -0600 | [diff] [blame] | 507 | { |
Linas Vepstas | 77bd741 | 2005-11-03 18:52:49 -0600 | [diff] [blame] | 508 | struct pci_bus *frozen_bus; |
Linas Vepstas | b6495c0 | 2005-11-03 18:54:54 -0600 | [diff] [blame] | 509 | int rc = 0; |
Paul Mackerras | 18eb3b3 | 2005-11-29 17:17:02 +1100 | [diff] [blame] | 510 | enum pci_ers_result result = PCI_ERS_RESULT_NONE; |
Linas Vepstas | 77bd741 | 2005-11-03 18:52:49 -0600 | [diff] [blame] | 511 | |
Gavin Shan | 9b3c76f | 2012-09-07 22:44:19 +0000 | [diff] [blame] | 512 | frozen_bus = eeh_pe_bus_get(pe); |
Linas Vepstas | 77bd741 | 2005-11-03 18:52:49 -0600 | [diff] [blame] | 513 | if (!frozen_bus) { |
Gavin Shan | 9b3c76f | 2012-09-07 22:44:19 +0000 | [diff] [blame] | 514 | pr_err("%s: Cannot find PCI bus for PHB#%d-PE#%x\n", |
| 515 | __func__, pe->phb->global_number, pe->addr); |
| 516 | return; |
Linas Vepstas | 77bd741 | 2005-11-03 18:52:49 -0600 | [diff] [blame] | 517 | } |
| 518 | |
Gavin Shan | 5a71978 | 2013-06-20 13:21:01 +0800 | [diff] [blame] | 519 | eeh_pe_update_time_stamp(pe); |
Gavin Shan | 9b3c76f | 2012-09-07 22:44:19 +0000 | [diff] [blame] | 520 | pe->freeze_count++; |
| 521 | if (pe->freeze_count > EEH_MAX_ALLOWED_FREEZES) |
Linas Vepstas | 8df8302 | 2006-03-29 15:31:04 -0600 | [diff] [blame] | 522 | goto excess_failures; |
Gavin Shan | 9b3c76f | 2012-09-07 22:44:19 +0000 | [diff] [blame] | 523 | pr_warning("EEH: This PCI device has failed %d times in the last hour\n", |
| 524 | pe->freeze_count); |
Linas Vepstas | 77bd741 | 2005-11-03 18:52:49 -0600 | [diff] [blame] | 525 | |
| 526 | /* Walk the various device drivers attached to this slot through |
| 527 | * a reset sequence, giving each an opportunity to do what it needs |
| 528 | * to accomplish the reset. Each child gets a report of the |
| 529 | * status ... if any child can't handle the reset, then the entire |
| 530 | * slot is dlpar removed and added. |
| 531 | */ |
Gavin Shan | 56ca4fd | 2013-06-27 13:46:46 +0800 | [diff] [blame] | 532 | pr_info("EEH: Notify device drivers to shutdown\n"); |
Gavin Shan | 9b3c76f | 2012-09-07 22:44:19 +0000 | [diff] [blame] | 533 | eeh_pe_dev_traverse(pe, eeh_report_error, &result); |
Linas Vepstas | 77bd741 | 2005-11-03 18:52:49 -0600 | [diff] [blame] | 534 | |
Linas Vepstas | 5f1a7c8 | 2007-11-16 05:58:36 +1100 | [diff] [blame] | 535 | /* Get the current PCI slot state. This can take a long time, |
Gavin Shan | 29f8bf1 | 2012-02-27 20:04:02 +0000 | [diff] [blame] | 536 | * sometimes over 3 seconds for certain systems. |
| 537 | */ |
Gavin Shan | 9b3c76f | 2012-09-07 22:44:19 +0000 | [diff] [blame] | 538 | rc = eeh_ops->wait_state(pe, MAX_WAIT_FOR_RECOVERY*1000); |
Gavin Shan | eb594a4 | 2012-02-27 20:03:57 +0000 | [diff] [blame] | 539 | if (rc < 0 || rc == EEH_STATE_NOT_SUPPORT) { |
Gavin Shan | 56ca4fd | 2013-06-27 13:46:46 +0800 | [diff] [blame] | 540 | pr_warning("EEH: Permanent failure\n"); |
Linas Vepstas | 5f1a7c8 | 2007-11-16 05:58:36 +1100 | [diff] [blame] | 541 | goto hard_fail; |
| 542 | } |
| 543 | |
Linas Vepstas | ede8ca2 | 2007-05-09 09:33:29 +1000 | [diff] [blame] | 544 | /* Since rtas may enable MMIO when posting the error log, |
| 545 | * don't post the error log until after all dev drivers |
Linas Vepstas | 17213c3 | 2007-05-10 02:38:11 +1000 | [diff] [blame] | 546 | * have been informed. |
| 547 | */ |
Gavin Shan | 56ca4fd | 2013-06-27 13:46:46 +0800 | [diff] [blame] | 548 | pr_info("EEH: Collect temporary log\n"); |
Gavin Shan | 9b3c76f | 2012-09-07 22:44:19 +0000 | [diff] [blame] | 549 | eeh_slot_error_detail(pe, EEH_LOG_TEMP); |
Linas Vepstas | ede8ca2 | 2007-05-09 09:33:29 +1000 | [diff] [blame] | 550 | |
Linas Vepstas | 77bd741 | 2005-11-03 18:52:49 -0600 | [diff] [blame] | 551 | /* If all device drivers were EEH-unaware, then shut |
| 552 | * down all of the device drivers, and hope they |
| 553 | * go down willingly, without panicing the system. |
| 554 | */ |
Paul Mackerras | 18eb3b3 | 2005-11-29 17:17:02 +1100 | [diff] [blame] | 555 | if (result == PCI_ERS_RESULT_NONE) { |
Gavin Shan | 56ca4fd | 2013-06-27 13:46:46 +0800 | [diff] [blame] | 556 | pr_info("EEH: Reset with hotplug activity\n"); |
Gavin Shan | 9b3c76f | 2012-09-07 22:44:19 +0000 | [diff] [blame] | 557 | rc = eeh_reset_device(pe, frozen_bus); |
Linas Vepstas | e0f90b6 | 2007-03-19 14:52:04 -0500 | [diff] [blame] | 558 | if (rc) { |
Gavin Shan | 56ca4fd | 2013-06-27 13:46:46 +0800 | [diff] [blame] | 559 | pr_warning("%s: Unable to reset, err=%d\n", |
| 560 | __func__, rc); |
Linas Vepstas | b6495c0 | 2005-11-03 18:54:54 -0600 | [diff] [blame] | 561 | goto hard_fail; |
Linas Vepstas | e0f90b6 | 2007-03-19 14:52:04 -0500 | [diff] [blame] | 562 | } |
Linas Vepstas | 77bd741 | 2005-11-03 18:52:49 -0600 | [diff] [blame] | 563 | } |
| 564 | |
Linas Vepstas | 6a1ca37 | 2006-09-15 18:58:59 -0500 | [diff] [blame] | 565 | /* If all devices reported they can proceed, then re-enable MMIO */ |
| 566 | if (result == PCI_ERS_RESULT_CAN_RECOVER) { |
Gavin Shan | 56ca4fd | 2013-06-27 13:46:46 +0800 | [diff] [blame] | 567 | pr_info("EEH: Enable I/O for affected devices\n"); |
Gavin Shan | 9b3c76f | 2012-09-07 22:44:19 +0000 | [diff] [blame] | 568 | rc = eeh_pci_enable(pe, EEH_OPT_THAW_MMIO); |
Linas Vepstas | 6a1ca37 | 2006-09-15 18:58:59 -0500 | [diff] [blame] | 569 | |
Linas Vepstas | fa1be47 | 2007-03-19 14:59:59 -0500 | [diff] [blame] | 570 | if (rc < 0) |
| 571 | goto hard_fail; |
Linas Vepstas | 6a1ca37 | 2006-09-15 18:58:59 -0500 | [diff] [blame] | 572 | if (rc) { |
| 573 | result = PCI_ERS_RESULT_NEED_RESET; |
| 574 | } else { |
Gavin Shan | 56ca4fd | 2013-06-27 13:46:46 +0800 | [diff] [blame] | 575 | pr_info("EEH: Notify device drivers to resume I/O\n"); |
Linas Vepstas | 6a1ca37 | 2006-09-15 18:58:59 -0500 | [diff] [blame] | 576 | result = PCI_ERS_RESULT_NONE; |
Gavin Shan | 9b3c76f | 2012-09-07 22:44:19 +0000 | [diff] [blame] | 577 | eeh_pe_dev_traverse(pe, eeh_report_mmio_enabled, &result); |
Linas Vepstas | 6a1ca37 | 2006-09-15 18:58:59 -0500 | [diff] [blame] | 578 | } |
| 579 | } |
| 580 | |
| 581 | /* If all devices reported they can proceed, then re-enable DMA */ |
| 582 | if (result == PCI_ERS_RESULT_CAN_RECOVER) { |
Gavin Shan | 56ca4fd | 2013-06-27 13:46:46 +0800 | [diff] [blame] | 583 | pr_info("EEH: Enabled DMA for affected devices\n"); |
Gavin Shan | 9b3c76f | 2012-09-07 22:44:19 +0000 | [diff] [blame] | 584 | rc = eeh_pci_enable(pe, EEH_OPT_THAW_DMA); |
Linas Vepstas | 6a1ca37 | 2006-09-15 18:58:59 -0500 | [diff] [blame] | 585 | |
Linas Vepstas | fa1be47 | 2007-03-19 14:59:59 -0500 | [diff] [blame] | 586 | if (rc < 0) |
| 587 | goto hard_fail; |
Linas Vepstas | 6a1ca37 | 2006-09-15 18:58:59 -0500 | [diff] [blame] | 588 | if (rc) |
| 589 | result = PCI_ERS_RESULT_NEED_RESET; |
Linas Vepstas | d0e7034 | 2006-12-06 12:32:20 -0600 | [diff] [blame] | 590 | else |
| 591 | result = PCI_ERS_RESULT_RECOVERED; |
Linas Vepstas | 6a1ca37 | 2006-09-15 18:58:59 -0500 | [diff] [blame] | 592 | } |
| 593 | |
| 594 | /* If any device has a hard failure, then shut off everything. */ |
Linas Vepstas | e0f90b6 | 2007-03-19 14:52:04 -0500 | [diff] [blame] | 595 | if (result == PCI_ERS_RESULT_DISCONNECT) { |
Gavin Shan | 56ca4fd | 2013-06-27 13:46:46 +0800 | [diff] [blame] | 596 | pr_warning("EEH: Device driver gave up\n"); |
Linas Vepstas | 6a1ca37 | 2006-09-15 18:58:59 -0500 | [diff] [blame] | 597 | goto hard_fail; |
Linas Vepstas | e0f90b6 | 2007-03-19 14:52:04 -0500 | [diff] [blame] | 598 | } |
Linas Vepstas | 6a1ca37 | 2006-09-15 18:58:59 -0500 | [diff] [blame] | 599 | |
Linas Vepstas | 77bd741 | 2005-11-03 18:52:49 -0600 | [diff] [blame] | 600 | /* If any device called out for a reset, then reset the slot */ |
Paul Mackerras | 18eb3b3 | 2005-11-29 17:17:02 +1100 | [diff] [blame] | 601 | if (result == PCI_ERS_RESULT_NEED_RESET) { |
Gavin Shan | 56ca4fd | 2013-06-27 13:46:46 +0800 | [diff] [blame] | 602 | pr_info("EEH: Reset without hotplug activity\n"); |
Gavin Shan | 9b3c76f | 2012-09-07 22:44:19 +0000 | [diff] [blame] | 603 | rc = eeh_reset_device(pe, NULL); |
Linas Vepstas | e0f90b6 | 2007-03-19 14:52:04 -0500 | [diff] [blame] | 604 | if (rc) { |
Gavin Shan | 56ca4fd | 2013-06-27 13:46:46 +0800 | [diff] [blame] | 605 | pr_warning("%s: Cannot reset, err=%d\n", |
| 606 | __func__, rc); |
Linas Vepstas | b6495c0 | 2005-11-03 18:54:54 -0600 | [diff] [blame] | 607 | goto hard_fail; |
Linas Vepstas | e0f90b6 | 2007-03-19 14:52:04 -0500 | [diff] [blame] | 608 | } |
Gavin Shan | 56ca4fd | 2013-06-27 13:46:46 +0800 | [diff] [blame] | 609 | |
| 610 | pr_info("EEH: Notify device drivers " |
| 611 | "the completion of reset\n"); |
Linas Vepstas | 6a1ca37 | 2006-09-15 18:58:59 -0500 | [diff] [blame] | 612 | result = PCI_ERS_RESULT_NONE; |
Gavin Shan | 9b3c76f | 2012-09-07 22:44:19 +0000 | [diff] [blame] | 613 | eeh_pe_dev_traverse(pe, eeh_report_reset, &result); |
Linas Vepstas | 77bd741 | 2005-11-03 18:52:49 -0600 | [diff] [blame] | 614 | } |
| 615 | |
Linas Vepstas | 6a1ca37 | 2006-09-15 18:58:59 -0500 | [diff] [blame] | 616 | /* All devices should claim they have recovered by now. */ |
Linas Vepstas | 90fdd61 | 2007-03-19 14:55:10 -0500 | [diff] [blame] | 617 | if ((result != PCI_ERS_RESULT_RECOVERED) && |
| 618 | (result != PCI_ERS_RESULT_NONE)) { |
Gavin Shan | 56ca4fd | 2013-06-27 13:46:46 +0800 | [diff] [blame] | 619 | pr_warning("EEH: Not recovered\n"); |
Linas Vepstas | 6a1ca37 | 2006-09-15 18:58:59 -0500 | [diff] [blame] | 620 | goto hard_fail; |
Linas Vepstas | e0f90b6 | 2007-03-19 14:52:04 -0500 | [diff] [blame] | 621 | } |
Linas Vepstas | 77bd741 | 2005-11-03 18:52:49 -0600 | [diff] [blame] | 622 | |
| 623 | /* Tell all device drivers that they can resume operations */ |
Gavin Shan | 56ca4fd | 2013-06-27 13:46:46 +0800 | [diff] [blame] | 624 | pr_info("EEH: Notify device driver to resume\n"); |
Gavin Shan | 9b3c76f | 2012-09-07 22:44:19 +0000 | [diff] [blame] | 625 | eeh_pe_dev_traverse(pe, eeh_report_resume, NULL); |
Linas Vepstas | b6495c0 | 2005-11-03 18:54:54 -0600 | [diff] [blame] | 626 | |
Gavin Shan | 9b3c76f | 2012-09-07 22:44:19 +0000 | [diff] [blame] | 627 | return; |
Gavin Shan | a84f273 | 2013-06-20 13:20:51 +0800 | [diff] [blame] | 628 | |
Linas Vepstas | 8df8302 | 2006-03-29 15:31:04 -0600 | [diff] [blame] | 629 | excess_failures: |
Linas Vepstas | b6495c0 | 2005-11-03 18:54:54 -0600 | [diff] [blame] | 630 | /* |
| 631 | * About 90% of all real-life EEH failures in the field |
| 632 | * are due to poorly seated PCI cards. Only 10% or so are |
| 633 | * due to actual, failed cards. |
| 634 | */ |
Gavin Shan | 9b3c76f | 2012-09-07 22:44:19 +0000 | [diff] [blame] | 635 | pr_err("EEH: PHB#%d-PE#%x has failed %d times in the\n" |
| 636 | "last hour and has been permanently disabled.\n" |
| 637 | "Please try reseating or replacing it.\n", |
| 638 | pe->phb->global_number, pe->addr, |
| 639 | pe->freeze_count); |
Linas Vepstas | 8df8302 | 2006-03-29 15:31:04 -0600 | [diff] [blame] | 640 | goto perm_error; |
Linas Vepstas | b6495c0 | 2005-11-03 18:54:54 -0600 | [diff] [blame] | 641 | |
Linas Vepstas | 8df8302 | 2006-03-29 15:31:04 -0600 | [diff] [blame] | 642 | hard_fail: |
Gavin Shan | 9b3c76f | 2012-09-07 22:44:19 +0000 | [diff] [blame] | 643 | pr_err("EEH: Unable to recover from failure from PHB#%d-PE#%x.\n" |
| 644 | "Please try reseating or replacing it\n", |
| 645 | pe->phb->global_number, pe->addr); |
Linas Vepstas | 8df8302 | 2006-03-29 15:31:04 -0600 | [diff] [blame] | 646 | |
| 647 | perm_error: |
Gavin Shan | 9b3c76f | 2012-09-07 22:44:19 +0000 | [diff] [blame] | 648 | eeh_slot_error_detail(pe, EEH_LOG_PERM); |
Linas Vepstas | b6495c0 | 2005-11-03 18:54:54 -0600 | [diff] [blame] | 649 | |
| 650 | /* Notify all devices that they're about to go down. */ |
Gavin Shan | 9b3c76f | 2012-09-07 22:44:19 +0000 | [diff] [blame] | 651 | eeh_pe_dev_traverse(pe, eeh_report_failure, NULL); |
Linas Vepstas | b6495c0 | 2005-11-03 18:54:54 -0600 | [diff] [blame] | 652 | |
| 653 | /* Shut down the device drivers for good. */ |
Rafael J. Wysocki | 1c2042c | 2014-01-15 14:33:20 +0100 | [diff] [blame] | 654 | if (frozen_bus) { |
| 655 | pci_lock_rescan_remove(); |
Gavin Shan | 9b3c76f | 2012-09-07 22:44:19 +0000 | [diff] [blame] | 656 | pcibios_remove_pci_devices(frozen_bus); |
Rafael J. Wysocki | 1c2042c | 2014-01-15 14:33:20 +0100 | [diff] [blame] | 657 | pci_unlock_rescan_remove(); |
| 658 | } |
Linas Vepstas | 77bd741 | 2005-11-03 18:52:49 -0600 | [diff] [blame] | 659 | } |
Gavin Shan | 8a6b1bc | 2013-06-20 13:21:04 +0800 | [diff] [blame] | 660 | |
| 661 | static void eeh_handle_special_event(void) |
| 662 | { |
| 663 | struct eeh_pe *pe, *phb_pe; |
| 664 | struct pci_bus *bus; |
Gavin Shan | 7e4e786 | 2014-01-15 13:16:11 +0800 | [diff] [blame] | 665 | struct pci_controller *hose; |
Gavin Shan | 8a6b1bc | 2013-06-20 13:21:04 +0800 | [diff] [blame] | 666 | unsigned long flags; |
Gavin Shan | 7e4e786 | 2014-01-15 13:16:11 +0800 | [diff] [blame] | 667 | int rc; |
Gavin Shan | 8a6b1bc | 2013-06-20 13:21:04 +0800 | [diff] [blame] | 668 | |
Gavin Shan | 8a6b1bc | 2013-06-20 13:21:04 +0800 | [diff] [blame] | 669 | |
Gavin Shan | 7e4e786 | 2014-01-15 13:16:11 +0800 | [diff] [blame] | 670 | do { |
| 671 | rc = eeh_ops->next_error(&pe); |
Gavin Shan | 8a6b1bc | 2013-06-20 13:21:04 +0800 | [diff] [blame] | 672 | |
Gavin Shan | 7e4e786 | 2014-01-15 13:16:11 +0800 | [diff] [blame] | 673 | switch (rc) { |
| 674 | case EEH_NEXT_ERR_DEAD_IOC: |
| 675 | /* Mark all PHBs in dead state */ |
| 676 | eeh_serialize_lock(&flags); |
| 677 | |
| 678 | /* Purge all events */ |
| 679 | eeh_remove_event(NULL); |
| 680 | |
| 681 | list_for_each_entry(hose, &hose_list, list_node) { |
| 682 | phb_pe = eeh_phb_pe_get(hose); |
| 683 | if (!phb_pe) continue; |
| 684 | |
| 685 | eeh_pe_state_mark(phb_pe, |
| 686 | EEH_PE_ISOLATED | EEH_PE_PHB_DEAD); |
| 687 | } |
| 688 | |
| 689 | eeh_serialize_unlock(flags); |
| 690 | |
| 691 | break; |
| 692 | case EEH_NEXT_ERR_FROZEN_PE: |
| 693 | case EEH_NEXT_ERR_FENCED_PHB: |
| 694 | case EEH_NEXT_ERR_DEAD_PHB: |
| 695 | /* Mark the PE in fenced state */ |
| 696 | eeh_serialize_lock(&flags); |
| 697 | |
| 698 | /* Purge all events of the PHB */ |
| 699 | eeh_remove_event(pe); |
| 700 | |
| 701 | if (rc == EEH_NEXT_ERR_DEAD_PHB) |
| 702 | eeh_pe_state_mark(pe, |
| 703 | EEH_PE_ISOLATED | EEH_PE_PHB_DEAD); |
| 704 | else |
| 705 | eeh_pe_state_mark(pe, |
| 706 | EEH_PE_ISOLATED | EEH_PE_RECOVERING); |
| 707 | |
| 708 | eeh_serialize_unlock(flags); |
| 709 | |
| 710 | break; |
| 711 | case EEH_NEXT_ERR_NONE: |
| 712 | return; |
| 713 | default: |
| 714 | pr_warn("%s: Invalid value %d from next_error()\n", |
| 715 | __func__, rc); |
| 716 | return; |
Gavin Shan | 8a6b1bc | 2013-06-20 13:21:04 +0800 | [diff] [blame] | 717 | } |
Gavin Shan | 8a6b1bc | 2013-06-20 13:21:04 +0800 | [diff] [blame] | 718 | |
Gavin Shan | 7e4e786 | 2014-01-15 13:16:11 +0800 | [diff] [blame] | 719 | /* |
| 720 | * For fenced PHB and frozen PE, it's handled as normal |
| 721 | * event. We have to remove the affected PHBs for dead |
| 722 | * PHB and IOC |
| 723 | */ |
| 724 | if (rc == EEH_NEXT_ERR_FROZEN_PE || |
| 725 | rc == EEH_NEXT_ERR_FENCED_PHB) { |
| 726 | eeh_handle_normal_event(pe); |
| 727 | } else { |
Linus Torvalds | 1b17366 | 2014-01-27 21:11:26 -0800 | [diff] [blame] | 728 | pci_lock_rescan_remove(); |
Gavin Shan | 7e4e786 | 2014-01-15 13:16:11 +0800 | [diff] [blame] | 729 | list_for_each_entry(hose, &hose_list, list_node) { |
| 730 | phb_pe = eeh_phb_pe_get(hose); |
| 731 | if (!phb_pe || |
| 732 | !(phb_pe->state & EEH_PE_PHB_DEAD)) |
| 733 | continue; |
Gavin Shan | 8a6b1bc | 2013-06-20 13:21:04 +0800 | [diff] [blame] | 734 | |
Gavin Shan | 7e4e786 | 2014-01-15 13:16:11 +0800 | [diff] [blame] | 735 | /* Notify all devices to be down */ |
| 736 | bus = eeh_pe_bus_get(phb_pe); |
| 737 | eeh_pe_dev_traverse(pe, |
| 738 | eeh_report_failure, NULL); |
| 739 | pcibios_remove_pci_devices(bus); |
| 740 | } |
Linus Torvalds | 1b17366 | 2014-01-27 21:11:26 -0800 | [diff] [blame] | 741 | pci_unlock_rescan_remove(); |
Gavin Shan | 8a6b1bc | 2013-06-20 13:21:04 +0800 | [diff] [blame] | 742 | } |
Gavin Shan | 7e4e786 | 2014-01-15 13:16:11 +0800 | [diff] [blame] | 743 | |
| 744 | /* |
| 745 | * If we have detected dead IOC, we needn't proceed |
| 746 | * any more since all PHBs would have been removed |
| 747 | */ |
| 748 | if (rc == EEH_NEXT_ERR_DEAD_IOC) |
| 749 | break; |
| 750 | } while (rc != EEH_NEXT_ERR_NONE); |
Gavin Shan | 8a6b1bc | 2013-06-20 13:21:04 +0800 | [diff] [blame] | 751 | } |
| 752 | |
| 753 | /** |
| 754 | * eeh_handle_event - Reset a PCI device after hard lockup. |
| 755 | * @pe: EEH PE |
| 756 | * |
| 757 | * While PHB detects address or data parity errors on particular PCI |
| 758 | * slot, the associated PE will be frozen. Besides, DMA's occurring |
| 759 | * to wild addresses (which usually happen due to bugs in device |
| 760 | * drivers or in PCI adapter firmware) can cause EEH error. #SERR, |
| 761 | * #PERR or other misc PCI-related errors also can trigger EEH errors. |
| 762 | * |
| 763 | * Recovery process consists of unplugging the device driver (which |
| 764 | * generated hotplug events to userspace), then issuing a PCI #RST to |
| 765 | * the device, then reconfiguring the PCI config space for all bridges |
| 766 | * & devices under this slot, and then finally restarting the device |
| 767 | * drivers (which cause a second set of hotplug events to go out to |
| 768 | * userspace). |
| 769 | */ |
| 770 | void eeh_handle_event(struct eeh_pe *pe) |
| 771 | { |
| 772 | if (pe) |
| 773 | eeh_handle_normal_event(pe); |
| 774 | else |
| 775 | eeh_handle_special_event(); |
| 776 | } |