diff options
Diffstat (limited to 'arch/powerpc/platforms/pseries/eeh_driver.c')
| -rw-r--r-- | arch/powerpc/platforms/pseries/eeh_driver.c | 507 |
1 files changed, 0 insertions, 507 deletions
diff --git a/arch/powerpc/platforms/pseries/eeh_driver.c b/arch/powerpc/platforms/pseries/eeh_driver.c deleted file mode 100644 index b8d70f5d9aa..00000000000 --- a/arch/powerpc/platforms/pseries/eeh_driver.c +++ /dev/null @@ -1,507 +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/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> - - -static inline const char * pcid_name (struct pci_dev *pdev) -{ - if (pdev && pdev->dev.driver) - return pdev->dev.driver->name; - return ""; -} - -#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 - */ -static void eeh_disable_irq(struct pci_dev *dev) -{ - struct device_node *dn = pci_device_to_OF_node(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; - disable_irq_nosync(dev->irq); -} - -/** - * eeh_enable_irq - enable interrupt for the recovering device - */ -static void eeh_enable_irq(struct pci_dev *dev) -{ - struct device_node *dn = pci_device_to_OF_node(dev); - - if ((PCI_DN(dn)->eeh_mode) & EEH_MODE_IRQ_DISABLED) { - PCI_DN(dn)->eeh_mode &= ~EEH_MODE_IRQ_DISABLED; - enable_irq(dev->irq); - } -} - -/* ------------------------------------------------------- */ -/** - * eeh_report_error - report pci error to each device driver - * - * 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; - struct pci_driver *driver = dev->driver; - - dev->error_state = pci_channel_io_frozen; - - if (!driver) - return 0; - - eeh_disable_irq(dev); - - if (!driver->err_handler || - !driver->err_handler->error_detected) - return 0; - - 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; - - return 0; -} - -/** - * eeh_report_mmio_enabled - tell drivers that MMIO has been enabled - * - * 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; - struct pci_driver *driver = dev->driver; - - if (!driver || - !driver->err_handler || - !driver->err_handler->mmio_enabled) - return 0; - - 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; - - return 0; -} - -/** - * eeh_report_reset - tell device that slot has been reset - */ - -static int eeh_report_reset(struct pci_dev *dev, void *userdata) -{ - enum pci_ers_result rc, *res = userdata; - struct pci_driver *driver = dev->driver; - - if (!driver) - return 0; - - dev->error_state = pci_channel_io_normal; - - eeh_enable_irq(dev); - - if (!driver->err_handler || - !driver->err_handler->slot_reset) - return 0; - - 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; - - return 0; -} - -/** - * eeh_report_resume - tell device to resume normal operations - */ - -static int eeh_report_resume(struct pci_dev *dev, void *userdata) -{ - struct pci_driver *driver = dev->driver; - - dev->error_state = pci_channel_io_normal; - - if (!driver) - return 0; - - eeh_enable_irq(dev); - - if (!driver->err_handler || - !driver->err_handler->resume) - return 0; - - driver->err_handler->resume(dev); - - return 0; -} - -/** - * eeh_report_failure - tell device driver that device is dead. - * - * 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; - - dev->error_state = pci_channel_io_perm_failure; - - if (!driver) - return 0; - - eeh_disable_irq(dev); - - if (!driver->err_handler || - !driver->err_handler->error_detected) - return 0; - - driver->err_handler->error_detected(dev, pci_channel_io_perm_failure); - - 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. - * - * 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). - */ - -/** - * 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) -{ - struct device_node *dn; - int cnt, rc; - - /* pcibios will clear the counter; save the value */ - cnt = pe_dn->eeh_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); - 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)) - dn = dn->parent->child; - - while (dn) { - struct pci_dn *ppe = PCI_DN(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); - } - dn = dn->sibling; - } - - /* 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_dn->eeh_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 - -struct pci_dn * handle_eeh_events (struct eeh_event *event) -{ - struct device_node *frozen_dn; - struct pci_dn *frozen_pdn; - struct pci_bus *frozen_bus; - int rc = 0; - enum pci_ers_result result = PCI_ERS_RESULT_NONE; - const char *location, *pci_str, *drv_str; - - frozen_dn = find_device_pe(event->dn); - if (!frozen_dn) { - - location = of_get_property(event->dn, "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)); - return NULL; - } - - frozen_bus = pcibios_find_pci_bus(frozen_dn); - location = of_get_property(frozen_dn, "ibm,loc-code", NULL); - location = location ? location : "unknown"; - - /* There are two different styles for coming up with the PE. - * In the old style, it was the highest EEH-capable device - * 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.. */ - if (!frozen_bus) - frozen_bus = pcibios_find_pci_bus (frozen_dn->parent); - - if (!frozen_bus) { - printk(KERN_ERR "EEH: Cannot find PCI bus " - "for location=%s dn=%s\n", - location, frozen_dn->full_name); - return NULL; - } - - frozen_pdn = PCI_DN(frozen_dn); - frozen_pdn->eeh_freeze_count++; - - if (frozen_pdn->pcidev) { - pci_str = pci_name (frozen_pdn->pcidev); - drv_str = pcid_name (frozen_pdn->pcidev); - } else { - pci_str = eeh_pci_name(event->dev); - drv_str = pcid_name (event->dev); - } - - if (frozen_pdn->eeh_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); - printk(KERN_WARNING - "EEH: location=%s driver=%s pci addr=%s\n", - location, drv_str, pci_str); - - /* 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. - */ - 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) { - 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(frozen_pdn, EEH_LOG_TEMP_FAILURE); - - /* 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); - 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 = rtas_pci_enable(frozen_pdn, EEH_THAW_MMIO); - - if (rc < 0) - goto hard_fail; - if (rc) { - result = PCI_ERS_RESULT_NEED_RESET; - } else { - result = PCI_ERS_RESULT_NONE; - pci_walk_bus(frozen_bus, eeh_report_mmio_enabled, &result); - } - } - - /* 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); - - 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(frozen_pdn, NULL); - if (rc) { - printk(KERN_WARNING "EEH: Cannot reset, rc=%d\n", rc); - goto hard_fail; - } - result = PCI_ERS_RESULT_NONE; - pci_walk_bus(frozen_bus, 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 */ - pci_walk_bus(frozen_bus, eeh_report_resume, NULL); - - return frozen_pdn; - -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. - */ - printk(KERN_ERR - "EEH: PCI device at location=%s driver=%s pci addr=%s\n" - "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); - goto perm_error; - -hard_fail: - printk(KERN_ERR - "EEH: Unable to recover from failure of PCI device " - "at location=%s driver=%s pci addr=%s\n" - "Please try reseating this device or replacing it.\n", - location, drv_str, pci_str); - -perm_error: - eeh_slot_error_detail(frozen_pdn, EEH_LOG_PERM_FAILURE); - - /* Notify all devices that they're about to go down. */ - pci_walk_bus(frozen_bus, eeh_report_failure, NULL); - - /* Shut down the device drivers for good. */ - pcibios_remove_pci_devices(frozen_bus); - - return NULL; -} - -/* ---------- end of file ---------- */ |