diff options
Diffstat (limited to 'arch/powerpc/platforms/pseries/eeh_driver.c')
| -rw-r--r-- | arch/powerpc/platforms/pseries/eeh_driver.c | 552 |
1 files changed, 0 insertions, 552 deletions
diff --git a/arch/powerpc/platforms/pseries/eeh_driver.c b/arch/powerpc/platforms/pseries/eeh_driver.c deleted file mode 100644 index 0acc5a2bdfc7..000000000000 --- a/arch/powerpc/platforms/pseries/eeh_driver.c +++ /dev/null @@ -1,552 +0,0 @@ -/* - * PCI Error Recovery Driver for RPA-compliant PPC64 platform. - * Copyright IBM Corp. 2004 2005 - * Copyright Linas Vepstas <linas@linas.org> 2004, 2005 - * - * All rights reserved. - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; either version 2 of the License, or (at - * your option) any later version. - * - * This program is distributed in the hope that it will be useful, but - * WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or - * NON INFRINGEMENT. See the GNU General Public License for more - * details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. - * - * Send comments and feedback to Linas Vepstas <linas@austin.ibm.com> - */ -#include <linux/delay.h> -#include <linux/interrupt.h> -#include <linux/irq.h> -#include <linux/module.h> -#include <linux/pci.h> -#include <asm/eeh.h> -#include <asm/eeh_event.h> -#include <asm/ppc-pci.h> -#include <asm/pci-bridge.h> -#include <asm/prom.h> -#include <asm/rtas.h> - -/** - * eeh_pcid_name - Retrieve name of PCI device driver - * @pdev: PCI device - * - * This routine is used to retrieve the name of PCI device driver - * if that's valid. - */ -static inline const char *eeh_pcid_name(struct pci_dev *pdev) -{ - if (pdev && pdev->dev.driver) - return pdev->dev.driver->name; - return ""; -} - -/** - * eeh_pcid_get - Get the PCI device driver - * @pdev: PCI device - * - * The function is used to retrieve the PCI device driver for - * the indicated PCI device. Besides, we will increase the reference - * of the PCI device driver to prevent that being unloaded on - * the fly. Otherwise, kernel crash would be seen. - */ -static inline struct pci_driver *eeh_pcid_get(struct pci_dev *pdev) -{ - if (!pdev || !pdev->driver) - return NULL; - - if (!try_module_get(pdev->driver->driver.owner)) - return NULL; - - return pdev->driver; -} - -/** - * eeh_pcid_put - Dereference on the PCI device driver - * @pdev: PCI device - * - * The function is called to do dereference on the PCI device - * driver of the indicated PCI device. - */ -static inline void eeh_pcid_put(struct pci_dev *pdev) -{ - if (!pdev || !pdev->driver) - return; - - module_put(pdev->driver->driver.owner); -} - -#if 0 -static void print_device_node_tree(struct pci_dn *pdn, int dent) -{ - int i; - struct device_node *pc; - - if (!pdn) - return; - for (i = 0; i < dent; i++) - printk(" "); - printk("dn=%s mode=%x \tcfg_addr=%x pe_addr=%x \tfull=%s\n", - pdn->node->name, pdn->eeh_mode, pdn->eeh_config_addr, - pdn->eeh_pe_config_addr, pdn->node->full_name); - dent += 3; - pc = pdn->node->child; - while (pc) { - print_device_node_tree(PCI_DN(pc), dent); - pc = pc->sibling; - } -} -#endif - -/** - * eeh_disable_irq - Disable interrupt for the recovering device - * @dev: PCI device - * - * This routine must be called when reporting temporary or permanent - * error to the particular PCI device to disable interrupt of that - * device. If the device has enabled MSI or MSI-X interrupt, we needn't - * do real work because EEH should freeze DMA transfers for those PCI - * devices encountering EEH errors, which includes MSI or MSI-X. - */ -static void eeh_disable_irq(struct pci_dev *dev) -{ - struct eeh_dev *edev = pci_dev_to_eeh_dev(dev); - - /* Don't disable MSI and MSI-X interrupts. They are - * effectively disabled by the DMA Stopped state - * when an EEH error occurs. - */ - if (dev->msi_enabled || dev->msix_enabled) - return; - - if (!irq_has_action(dev->irq)) - return; - - edev->mode |= EEH_DEV_IRQ_DISABLED; - disable_irq_nosync(dev->irq); -} - -/** - * eeh_enable_irq - Enable interrupt for the recovering device - * @dev: PCI device - * - * This routine must be called to enable interrupt while failed - * device could be resumed. - */ -static void eeh_enable_irq(struct pci_dev *dev) -{ - struct eeh_dev *edev = pci_dev_to_eeh_dev(dev); - - if ((edev->mode) & EEH_DEV_IRQ_DISABLED) { - edev->mode &= ~EEH_DEV_IRQ_DISABLED; - enable_irq(dev->irq); - } -} - -/** - * eeh_report_error - Report pci error to each device driver - * @data: eeh device - * @userdata: return value - * - * Report an EEH error to each device driver, collect up and - * merge the device driver responses. Cumulative response - * passed back in "userdata". - */ -static void *eeh_report_error(void *data, void *userdata) -{ - struct eeh_dev *edev = (struct eeh_dev *)data; - struct pci_dev *dev = eeh_dev_to_pci_dev(edev); - enum pci_ers_result rc, *res = userdata; - struct pci_driver *driver; - - /* We might not have the associated PCI device, - * then we should continue for next one. - */ - if (!dev) return NULL; - dev->error_state = pci_channel_io_frozen; - - driver = eeh_pcid_get(dev); - if (!driver) return NULL; - - eeh_disable_irq(dev); - - if (!driver->err_handler || - !driver->err_handler->error_detected) { - eeh_pcid_put(dev); - return NULL; - } - - rc = driver->err_handler->error_detected(dev, pci_channel_io_frozen); - - /* A driver that needs a reset trumps all others */ - if (rc == PCI_ERS_RESULT_NEED_RESET) *res = rc; - if (*res == PCI_ERS_RESULT_NONE) *res = rc; - - eeh_pcid_put(dev); - return NULL; -} - -/** - * eeh_report_mmio_enabled - Tell drivers that MMIO has been enabled - * @data: eeh device - * @userdata: return value - * - * Tells each device driver that IO ports, MMIO and config space I/O - * are now enabled. Collects up and merges the device driver responses. - * Cumulative response passed back in "userdata". - */ -static void *eeh_report_mmio_enabled(void *data, void *userdata) -{ - struct eeh_dev *edev = (struct eeh_dev *)data; - struct pci_dev *dev = eeh_dev_to_pci_dev(edev); - enum pci_ers_result rc, *res = userdata; - struct pci_driver *driver; - - driver = eeh_pcid_get(dev); - if (!driver) return NULL; - - if (!driver->err_handler || - !driver->err_handler->mmio_enabled) { - eeh_pcid_put(dev); - return NULL; - } - - rc = driver->err_handler->mmio_enabled(dev); - - /* A driver that needs a reset trumps all others */ - if (rc == PCI_ERS_RESULT_NEED_RESET) *res = rc; - if (*res == PCI_ERS_RESULT_NONE) *res = rc; - - eeh_pcid_put(dev); - return NULL; -} - -/** - * eeh_report_reset - Tell device that slot has been reset - * @data: eeh device - * @userdata: return value - * - * This routine must be called while EEH tries to reset particular - * PCI device so that the associated PCI device driver could take - * some actions, usually to save data the driver needs so that the - * driver can work again while the device is recovered. - */ -static void *eeh_report_reset(void *data, void *userdata) -{ - struct eeh_dev *edev = (struct eeh_dev *)data; - struct pci_dev *dev = eeh_dev_to_pci_dev(edev); - enum pci_ers_result rc, *res = userdata; - struct pci_driver *driver; - - if (!dev) return NULL; - dev->error_state = pci_channel_io_normal; - - driver = eeh_pcid_get(dev); - if (!driver) return NULL; - - eeh_enable_irq(dev); - - if (!driver->err_handler || - !driver->err_handler->slot_reset) { - eeh_pcid_put(dev); - return NULL; - } - - rc = driver->err_handler->slot_reset(dev); - if ((*res == PCI_ERS_RESULT_NONE) || - (*res == PCI_ERS_RESULT_RECOVERED)) *res = rc; - if (*res == PCI_ERS_RESULT_DISCONNECT && - rc == PCI_ERS_RESULT_NEED_RESET) *res = rc; - - eeh_pcid_put(dev); - return NULL; -} - -/** - * eeh_report_resume - Tell device to resume normal operations - * @data: eeh device - * @userdata: return value - * - * This routine must be called to notify the device driver that it - * could resume so that the device driver can do some initialization - * to make the recovered device work again. - */ -static void *eeh_report_resume(void *data, void *userdata) -{ - struct eeh_dev *edev = (struct eeh_dev *)data; - struct pci_dev *dev = eeh_dev_to_pci_dev(edev); - struct pci_driver *driver; - - if (!dev) return NULL; - dev->error_state = pci_channel_io_normal; - - driver = eeh_pcid_get(dev); - if (!driver) return NULL; - - eeh_enable_irq(dev); - - if (!driver->err_handler || - !driver->err_handler->resume) { - eeh_pcid_put(dev); - return NULL; - } - - driver->err_handler->resume(dev); - - eeh_pcid_put(dev); - return NULL; -} - -/** - * eeh_report_failure - Tell device driver that device is dead. - * @data: eeh device - * @userdata: return value - * - * This informs the device driver that the device is permanently - * dead, and that no further recovery attempts will be made on it. - */ -static void *eeh_report_failure(void *data, void *userdata) -{ - struct eeh_dev *edev = (struct eeh_dev *)data; - struct pci_dev *dev = eeh_dev_to_pci_dev(edev); - struct pci_driver *driver; - - if (!dev) return NULL; - dev->error_state = pci_channel_io_perm_failure; - - driver = eeh_pcid_get(dev); - if (!driver) return NULL; - - eeh_disable_irq(dev); - - if (!driver->err_handler || - !driver->err_handler->error_detected) { - eeh_pcid_put(dev); - return NULL; - } - - driver->err_handler->error_detected(dev, pci_channel_io_perm_failure); - - eeh_pcid_put(dev); - return NULL; -} - -/** - * eeh_reset_device - Perform actual reset of a pci slot - * @pe: EEH PE - * @bus: PCI bus corresponding to the isolcated slot - * - * This routine must be called to do reset on the indicated PE. - * During the reset, udev might be invoked because those affected - * PCI devices will be removed and then added. - */ -static int eeh_reset_device(struct eeh_pe *pe, struct pci_bus *bus) -{ - int cnt, rc; - - /* pcibios will clear the counter; save the value */ - cnt = pe->freeze_count; - - /* - * We don't remove the corresponding PE instances because - * we need the information afterwords. The attached EEH - * devices are expected to be attached soon when calling - * into pcibios_add_pci_devices(). - */ - if (bus) - __pcibios_remove_pci_devices(bus, 0); - - /* Reset the pci controller. (Asserts RST#; resets config space). - * Reconfigure bridges and devices. Don't try to bring the system - * up if the reset failed for some reason. - */ - rc = eeh_reset_pe(pe); - if (rc) - return rc; - - /* Restore PE */ - eeh_ops->configure_bridge(pe); - eeh_pe_restore_bars(pe); - - /* Give the system 5 seconds to finish running the user-space - * hotplug shutdown scripts, e.g. ifdown for ethernet. Yes, - * this is a hack, but if we don't do this, and try to bring - * the device up before the scripts have taken it down, - * potentially weird things happen. - */ - if (bus) { - ssleep(5); - pcibios_add_pci_devices(bus); - } - pe->freeze_count = cnt; - - return 0; -} - -/* The longest amount of time to wait for a pci device - * to come back on line, in seconds. - */ -#define MAX_WAIT_FOR_RECOVERY 150 - -/** - * eeh_handle_event - Reset a PCI device after hard lockup. - * @pe: EEH PE - * - * While PHB detects address or data parity errors on particular PCI - * slot, the associated PE will be frozen. Besides, DMA's occurring - * to wild addresses (which usually happen due to bugs in device - * drivers or in PCI adapter firmware) can cause EEH error. #SERR, - * #PERR or other misc PCI-related errors also can trigger EEH errors. - * - * Recovery process consists of unplugging the device driver (which - * generated hotplug events to userspace), then issuing a PCI #RST to - * the device, then reconfiguring the PCI config space for all bridges - * & devices under this slot, and then finally restarting the device - * drivers (which cause a second set of hotplug events to go out to - * userspace). - */ -void eeh_handle_event(struct eeh_pe *pe) -{ - struct pci_bus *frozen_bus; - int rc = 0; - enum pci_ers_result result = PCI_ERS_RESULT_NONE; - - frozen_bus = eeh_pe_bus_get(pe); - if (!frozen_bus) { - pr_err("%s: Cannot find PCI bus for PHB#%d-PE#%x\n", - __func__, pe->phb->global_number, pe->addr); - return; - } - - pe->freeze_count++; - if (pe->freeze_count > EEH_MAX_ALLOWED_FREEZES) - goto excess_failures; - pr_warning("EEH: This PCI device has failed %d times in the last hour\n", - pe->freeze_count); - - /* Walk the various device drivers attached to this slot through - * a reset sequence, giving each an opportunity to do what it needs - * to accomplish the reset. Each child gets a report of the - * status ... if any child can't handle the reset, then the entire - * slot is dlpar removed and added. - */ - eeh_pe_dev_traverse(pe, eeh_report_error, &result); - - /* Get the current PCI slot state. This can take a long time, - * sometimes over 3 seconds for certain systems. - */ - rc = eeh_ops->wait_state(pe, MAX_WAIT_FOR_RECOVERY*1000); - if (rc < 0 || rc == EEH_STATE_NOT_SUPPORT) { - printk(KERN_WARNING "EEH: Permanent failure\n"); - goto hard_fail; - } - - /* Since rtas may enable MMIO when posting the error log, - * don't post the error log until after all dev drivers - * have been informed. - */ - eeh_slot_error_detail(pe, EEH_LOG_TEMP); - - /* If all device drivers were EEH-unaware, then shut - * down all of the device drivers, and hope they - * go down willingly, without panicing the system. - */ - if (result == PCI_ERS_RESULT_NONE) { - rc = eeh_reset_device(pe, frozen_bus); - if (rc) { - printk(KERN_WARNING "EEH: Unable to reset, rc=%d\n", rc); - goto hard_fail; - } - } - - /* If all devices reported they can proceed, then re-enable MMIO */ - if (result == PCI_ERS_RESULT_CAN_RECOVER) { - rc = eeh_pci_enable(pe, EEH_OPT_THAW_MMIO); - - if (rc < 0) - goto hard_fail; - if (rc) { - result = PCI_ERS_RESULT_NEED_RESET; - } else { - result = PCI_ERS_RESULT_NONE; - eeh_pe_dev_traverse(pe, eeh_report_mmio_enabled, &result); - } - } - - /* If all devices reported they can proceed, then re-enable DMA */ - if (result == PCI_ERS_RESULT_CAN_RECOVER) { - rc = eeh_pci_enable(pe, EEH_OPT_THAW_DMA); - - if (rc < 0) - goto hard_fail; - if (rc) - result = PCI_ERS_RESULT_NEED_RESET; - else - result = PCI_ERS_RESULT_RECOVERED; - } - - /* If any device has a hard failure, then shut off everything. */ - if (result == PCI_ERS_RESULT_DISCONNECT) { - printk(KERN_WARNING "EEH: Device driver gave up\n"); - goto hard_fail; - } - - /* If any device called out for a reset, then reset the slot */ - if (result == PCI_ERS_RESULT_NEED_RESET) { - rc = eeh_reset_device(pe, NULL); - if (rc) { - printk(KERN_WARNING "EEH: Cannot reset, rc=%d\n", rc); - goto hard_fail; - } - result = PCI_ERS_RESULT_NONE; - eeh_pe_dev_traverse(pe, eeh_report_reset, &result); - } - - /* All devices should claim they have recovered by now. */ - if ((result != PCI_ERS_RESULT_RECOVERED) && - (result != PCI_ERS_RESULT_NONE)) { - printk(KERN_WARNING "EEH: Not recovered\n"); - goto hard_fail; - } - - /* Tell all device drivers that they can resume operations */ - eeh_pe_dev_traverse(pe, eeh_report_resume, NULL); - - return; - -excess_failures: - /* - * About 90% of all real-life EEH failures in the field - * are due to poorly seated PCI cards. Only 10% or so are - * due to actual, failed cards. - */ - pr_err("EEH: PHB#%d-PE#%x has failed %d times in the\n" - "last hour and has been permanently disabled.\n" - "Please try reseating or replacing it.\n", - pe->phb->global_number, pe->addr, - pe->freeze_count); - goto perm_error; - -hard_fail: - pr_err("EEH: Unable to recover from failure from PHB#%d-PE#%x.\n" - "Please try reseating or replacing it\n", - pe->phb->global_number, pe->addr); - -perm_error: - eeh_slot_error_detail(pe, EEH_LOG_PERM); - - /* Notify all devices that they're about to go down. */ - eeh_pe_dev_traverse(pe, eeh_report_failure, NULL); - - /* Shut down the device drivers for good. */ - if (frozen_bus) - pcibios_remove_pci_devices(frozen_bus); -} - |