diff options
Diffstat (limited to 'arch/powerpc/platforms/pseries/eeh_driver.c')
| -rw-r--r-- | arch/powerpc/platforms/pseries/eeh_driver.c | 213 |
1 files changed, 120 insertions, 93 deletions
diff --git a/arch/powerpc/platforms/pseries/eeh_driver.c b/arch/powerpc/platforms/pseries/eeh_driver.c index 1b6cb10..baf92cd 100644 --- a/arch/powerpc/platforms/pseries/eeh_driver.c +++ b/arch/powerpc/platforms/pseries/eeh_driver.c @@ -33,8 +33,14 @@ #include <asm/prom.h> #include <asm/rtas.h> - -static inline const char * pcid_name (struct pci_dev *pdev) +/** + * 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; @@ -64,48 +70,59 @@ static void print_device_node_tree(struct pci_dn *pdn, int dent) #endif /** - * eeh_disable_irq - disable interrupt for the recovering device + * 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 device_node *dn = pci_device_to_OF_node(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; - PCI_DN(dn)->eeh_mode |= EEH_MODE_IRQ_DISABLED; + edev->mode |= EEH_MODE_IRQ_DISABLED; disable_irq_nosync(dev->irq); } /** - * eeh_enable_irq - enable interrupt for the recovering device + * 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 device_node *dn = pci_device_to_OF_node(dev); + struct eeh_dev *edev = pci_dev_to_eeh_dev(dev); - if ((PCI_DN(dn)->eeh_mode) & EEH_MODE_IRQ_DISABLED) { - PCI_DN(dn)->eeh_mode &= ~EEH_MODE_IRQ_DISABLED; + if ((edev->mode) & EEH_MODE_IRQ_DISABLED) { + edev->mode &= ~EEH_MODE_IRQ_DISABLED; enable_irq(dev->irq); } } -/* ------------------------------------------------------- */ /** - * eeh_report_error - report pci error to each device driver + * eeh_report_error - Report pci error to each device driver + * @dev: PCI 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 int eeh_report_error(struct pci_dev *dev, void *userdata) { enum pci_ers_result rc, *res = userdata; @@ -122,7 +139,7 @@ static int eeh_report_error(struct pci_dev *dev, void *userdata) !driver->err_handler->error_detected) return 0; - rc = driver->err_handler->error_detected (dev, pci_channel_io_frozen); + 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; @@ -132,13 +149,14 @@ static int eeh_report_error(struct pci_dev *dev, void *userdata) } /** - * eeh_report_mmio_enabled - tell drivers that MMIO has been enabled + * eeh_report_mmio_enabled - Tell drivers that MMIO has been enabled + * @dev: PCI 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 int eeh_report_mmio_enabled(struct pci_dev *dev, void *userdata) { enum pci_ers_result rc, *res = userdata; @@ -149,7 +167,7 @@ static int eeh_report_mmio_enabled(struct pci_dev *dev, void *userdata) !driver->err_handler->mmio_enabled) return 0; - rc = driver->err_handler->mmio_enabled (dev); + 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; @@ -159,9 +177,15 @@ static int eeh_report_mmio_enabled(struct pci_dev *dev, void *userdata) } /** - * eeh_report_reset - tell device that slot has been reset + * eeh_report_reset - Tell device that slot has been reset + * @dev: PCI 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 int eeh_report_reset(struct pci_dev *dev, void *userdata) { enum pci_ers_result rc, *res = userdata; @@ -188,9 +212,14 @@ static int eeh_report_reset(struct pci_dev *dev, void *userdata) } /** - * eeh_report_resume - tell device to resume normal operations + * eeh_report_resume - Tell device to resume normal operations + * @dev: PCI 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 int eeh_report_resume(struct pci_dev *dev, void *userdata) { struct pci_driver *driver = dev->driver; @@ -212,12 +241,13 @@ static int eeh_report_resume(struct pci_dev *dev, void *userdata) } /** - * eeh_report_failure - tell device driver that device is dead. + * eeh_report_failure - Tell device driver that device is dead. + * @dev: PCI 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 int eeh_report_failure(struct pci_dev *dev, void *userdata) { struct pci_driver *driver = dev->driver; @@ -238,65 +268,46 @@ static int eeh_report_failure(struct pci_dev *dev, void *userdata) return 0; } -/* ------------------------------------------------------- */ /** - * handle_eeh_events -- reset a PCI device after hard lockup. - * - * pSeries systems will isolate a PCI slot if the PCI-Host - * bridge detects address or data parity errors, DMA's - * occurring to wild addresses (which usually happen due to - * bugs in device drivers or in PCI adapter firmware). - * Slot isolations also occur if #SERR, #PERR or other misc - * PCI-related errors are detected. + * eeh_reset_device - Perform actual reset of a pci slot + * @edev: PE associated EEH device + * @bus: PCI bus corresponding to the isolcated slot * - * 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). + * 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. */ - -/** - * eeh_reset_device() -- perform actual reset of a pci slot - * @bus: pointer to the pci bus structure corresponding - * to the isolated slot. A non-null value will - * cause all devices under the bus to be removed - * and then re-added. - * @pe_dn: pointer to a "Partionable Endpoint" device node. - * This is the top-level structure on which pci - * bus resets can be performed. - */ - -static int eeh_reset_device (struct pci_dn *pe_dn, struct pci_bus *bus) +static int eeh_reset_device(struct eeh_dev *edev, struct pci_bus *bus) { struct device_node *dn; int cnt, rc; /* pcibios will clear the counter; save the value */ - cnt = pe_dn->eeh_freeze_count; + cnt = edev->freeze_count; if (bus) pcibios_remove_pci_devices(bus); /* 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 = rtas_set_slot_reset(pe_dn); + * up if the reset failed for some reason. + */ + rc = eeh_reset_pe(edev); if (rc) return rc; - /* Walk over all functions on this device. */ - dn = pe_dn->node; - if (!pcibios_find_pci_bus(dn) && PCI_DN(dn->parent)) + /* Walk over all functions on this device. */ + dn = eeh_dev_to_of_node(edev); + if (!pcibios_find_pci_bus(dn) && of_node_to_eeh_dev(dn->parent)) dn = dn->parent->child; while (dn) { - struct pci_dn *ppe = PCI_DN(dn); + struct eeh_dev *pedev = of_node_to_eeh_dev(dn); + /* On Power4, always true because eeh_pe_config_addr=0 */ - if (pe_dn->eeh_pe_config_addr == ppe->eeh_pe_config_addr) { - rtas_configure_bridge(ppe); - eeh_restore_bars(ppe); + if (edev->pe_config_addr == pedev->pe_config_addr) { + eeh_ops->configure_bridge(dn); + eeh_restore_bars(pedev); } dn = dn->sibling; } @@ -308,10 +319,10 @@ static int eeh_reset_device (struct pci_dn *pe_dn, struct pci_bus *bus) * potentially weird things happen. */ if (bus) { - ssleep (5); + ssleep(5); pcibios_add_pci_devices(bus); } - pe_dn->eeh_freeze_count = cnt; + edev->freeze_count = cnt; return 0; } @@ -321,23 +332,39 @@ static int eeh_reset_device (struct pci_dn *pe_dn, struct pci_bus *bus) */ #define MAX_WAIT_FOR_RECOVERY 150 -struct pci_dn * handle_eeh_events (struct eeh_event *event) +/** + * eeh_handle_event - Reset a PCI device after hard lockup. + * @event: EEH event + * + * 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). + */ +struct eeh_dev *handle_eeh_events(struct eeh_event *event) { struct device_node *frozen_dn; - struct pci_dn *frozen_pdn; + struct eeh_dev *frozen_edev; struct pci_bus *frozen_bus; int rc = 0; enum pci_ers_result result = PCI_ERS_RESULT_NONE; const char *location, *pci_str, *drv_str, *bus_pci_str, *bus_drv_str; - frozen_dn = find_device_pe(event->dn); + frozen_dn = eeh_find_device_pe(eeh_dev_to_of_node(event->edev)); if (!frozen_dn) { - - location = of_get_property(event->dn, "ibm,loc-code", NULL); + location = of_get_property(eeh_dev_to_of_node(event->edev), "ibm,loc-code", NULL); location = location ? location : "unknown"; printk(KERN_ERR "EEH: Error: Cannot find partition endpoint " "for location=%s pci addr=%s\n", - location, eeh_pci_name(event->dev)); + location, eeh_pci_name(eeh_dev_to_pci_dev(event->edev))); return NULL; } @@ -350,9 +377,10 @@ struct pci_dn * handle_eeh_events (struct eeh_event *event) * which was always an EADS pci bridge. In the new style, * there might not be any EADS bridges, and even when there are, * the firmware marks them as "EEH incapable". So another - * two-step is needed to find the pci bus.. */ + * two-step is needed to find the pci bus.. + */ if (!frozen_bus) - frozen_bus = pcibios_find_pci_bus (frozen_dn->parent); + frozen_bus = pcibios_find_pci_bus(frozen_dn->parent); if (!frozen_bus) { printk(KERN_ERR "EEH: Cannot find PCI bus " @@ -361,22 +389,21 @@ struct pci_dn * handle_eeh_events (struct eeh_event *event) return NULL; } - frozen_pdn = PCI_DN(frozen_dn); - frozen_pdn->eeh_freeze_count++; + frozen_edev = of_node_to_eeh_dev(frozen_dn); + frozen_edev->freeze_count++; + pci_str = eeh_pci_name(eeh_dev_to_pci_dev(event->edev)); + drv_str = eeh_pcid_name(eeh_dev_to_pci_dev(event->edev)); - pci_str = eeh_pci_name(event->dev); - drv_str = pcid_name(event->dev); - - if (frozen_pdn->eeh_freeze_count > EEH_MAX_ALLOWED_FREEZES) + if (frozen_edev->freeze_count > EEH_MAX_ALLOWED_FREEZES) goto excess_failures; printk(KERN_WARNING "EEH: This PCI device has failed %d times in the last hour:\n", - frozen_pdn->eeh_freeze_count); + frozen_edev->freeze_count); - if (frozen_pdn->pcidev) { - bus_pci_str = pci_name(frozen_pdn->pcidev); - bus_drv_str = pcid_name(frozen_pdn->pcidev); + if (frozen_edev->pdev) { + bus_pci_str = pci_name(frozen_edev->pdev); + bus_drv_str = eeh_pcid_name(frozen_edev->pdev); printk(KERN_WARNING "EEH: Bus location=%s driver=%s pci addr=%s\n", location, bus_drv_str, bus_pci_str); @@ -395,9 +422,10 @@ struct pci_dn * handle_eeh_events (struct eeh_event *event) pci_walk_bus(frozen_bus, 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_wait_for_slot_status (frozen_pdn, MAX_WAIT_FOR_RECOVERY*1000); - if (rc < 0) { + * sometimes over 3 seconds for certain systems. + */ + rc = eeh_ops->wait_state(eeh_dev_to_of_node(frozen_edev), MAX_WAIT_FOR_RECOVERY*1000); + if (rc < 0 || rc == EEH_STATE_NOT_SUPPORT) { printk(KERN_WARNING "EEH: Permanent failure\n"); goto hard_fail; } @@ -406,14 +434,14 @@ struct pci_dn * handle_eeh_events (struct eeh_event *event) * don't post the error log until after all dev drivers * have been informed. */ - eeh_slot_error_detail(frozen_pdn, EEH_LOG_TEMP_FAILURE); + eeh_slot_error_detail(frozen_edev, 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(frozen_pdn, frozen_bus); + rc = eeh_reset_device(frozen_edev, frozen_bus); if (rc) { printk(KERN_WARNING "EEH: Unable to reset, rc=%d\n", rc); goto hard_fail; @@ -422,7 +450,7 @@ struct pci_dn * handle_eeh_events (struct eeh_event *event) /* If all devices reported they can proceed, then re-enable MMIO */ if (result == PCI_ERS_RESULT_CAN_RECOVER) { - rc = rtas_pci_enable(frozen_pdn, EEH_THAW_MMIO); + rc = eeh_pci_enable(frozen_edev, EEH_OPT_THAW_MMIO); if (rc < 0) goto hard_fail; @@ -436,7 +464,7 @@ struct pci_dn * handle_eeh_events (struct eeh_event *event) /* If all devices reported they can proceed, then re-enable DMA */ if (result == PCI_ERS_RESULT_CAN_RECOVER) { - rc = rtas_pci_enable(frozen_pdn, EEH_THAW_DMA); + rc = eeh_pci_enable(frozen_edev, EEH_OPT_THAW_DMA); if (rc < 0) goto hard_fail; @@ -454,7 +482,7 @@ struct pci_dn * handle_eeh_events (struct eeh_event *event) /* If any device called out for a reset, then reset the slot */ if (result == PCI_ERS_RESULT_NEED_RESET) { - rc = eeh_reset_device(frozen_pdn, NULL); + rc = eeh_reset_device(frozen_edev, NULL); if (rc) { printk(KERN_WARNING "EEH: Cannot reset, rc=%d\n", rc); goto hard_fail; @@ -473,7 +501,7 @@ struct pci_dn * handle_eeh_events (struct eeh_event *event) /* Tell all device drivers that they can resume operations */ pci_walk_bus(frozen_bus, eeh_report_resume, NULL); - return frozen_pdn; + return frozen_edev; excess_failures: /* @@ -486,7 +514,7 @@ excess_failures: "has failed %d times in the last hour " "and has been permanently disabled.\n" "Please try reseating this device or replacing it.\n", - location, drv_str, pci_str, frozen_pdn->eeh_freeze_count); + location, drv_str, pci_str, frozen_edev->freeze_count); goto perm_error; hard_fail: @@ -497,7 +525,7 @@ hard_fail: location, drv_str, pci_str); perm_error: - eeh_slot_error_detail(frozen_pdn, EEH_LOG_PERM_FAILURE); + eeh_slot_error_detail(frozen_edev, EEH_LOG_PERM); /* Notify all devices that they're about to go down. */ pci_walk_bus(frozen_bus, eeh_report_failure, NULL); @@ -508,4 +536,3 @@ perm_error: return NULL; } -/* ---------- end of file ---------- */ |
