diff options
Diffstat (limited to 'arch/powerpc/platforms/pseries/eeh_driver.c')
| -rw-r--r-- | arch/powerpc/platforms/pseries/eeh_driver.c | 376 |
1 files changed, 0 insertions, 376 deletions
diff --git a/arch/powerpc/platforms/pseries/eeh_driver.c b/arch/powerpc/platforms/pseries/eeh_driver.c deleted file mode 100644 index 6373372932b..00000000000 --- a/arch/powerpc/platforms/pseries/eeh_driver.c +++ /dev/null @@ -1,376 +0,0 @@ -/* - * PCI Error Recovery Driver for RPA-compliant PPC64 platform. - * Copyright (C) 2004, 2005 Linas Vepstas <linas@linas.org> - * - * 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 feedback to <linas@us.ibm.com> - * - */ -#include <linux/delay.h> -#include <linux/irq.h> -#include <linux/interrupt.h> -#include <linux/notifier.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->dev.driver) - return pdev->dev.driver->name; - return ""; -} - -#ifdef DEBUG -static void print_device_node_tree (struct pci_dn *pdn, int dent) -{ - int i; - 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; - struct device_node *pc = pdn->node->child; - while (pc) { - print_device_node_tree(PCI_DN(pc), dent); - pc = pc->sibling; - } -} -#endif - -/** - * irq_in_use - return true if this irq is being used - */ -static int irq_in_use(unsigned int irq) -{ - int rc = 0; - unsigned long flags; - struct irq_desc *desc = irq_desc + irq; - - spin_lock_irqsave(&desc->lock, flags); - if (desc->action) - rc = 1; - spin_unlock_irqrestore(&desc->lock, flags); - return rc; -} - -/* ------------------------------------------------------- */ -/** eeh_report_error - report an EEH error to each device, - * collect up and merge the device responses. - */ - -static void 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; - - if (irq_in_use (dev->irq)) { - struct device_node *dn = pci_device_to_OF_node(dev); - PCI_DN(dn)->eeh_mode |= EEH_MODE_IRQ_DISABLED; - disable_irq_nosync(dev->irq); - } - if (!driver->err_handler) - return; - if (!driver->err_handler->error_detected) - return; - - rc = driver->err_handler->error_detected (dev, pci_channel_io_frozen); - if (*res == PCI_ERS_RESULT_NONE) *res = rc; - if (*res == PCI_ERS_RESULT_NEED_RESET) return; - if (*res == PCI_ERS_RESULT_DISCONNECT && - rc == PCI_ERS_RESULT_NEED_RESET) *res = rc; -} - -/** eeh_report_reset -- tell this device that the pci slot - * has been reset. - */ - -static void eeh_report_reset(struct pci_dev *dev, void *userdata) -{ - struct pci_driver *driver = dev->driver; - struct device_node *dn = pci_device_to_OF_node(dev); - - if (!driver) - return; - - if ((PCI_DN(dn)->eeh_mode) & EEH_MODE_IRQ_DISABLED) { - PCI_DN(dn)->eeh_mode &= ~EEH_MODE_IRQ_DISABLED; - enable_irq(dev->irq); - } - if (!driver->err_handler) - return; - if (!driver->err_handler->slot_reset) - return; - - driver->err_handler->slot_reset(dev); -} - -static void 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; - if (!driver->err_handler) - return; - if (!driver->err_handler->resume) - return; - - driver->err_handler->resume(dev); -} - -static void 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; - - if (irq_in_use (dev->irq)) { - struct device_node *dn = pci_device_to_OF_node(dev); - PCI_DN(dn)->eeh_mode |= EEH_MODE_IRQ_DISABLED; - disable_irq_nosync(dev->irq); - } - if (!driver->err_handler) - return; - if (!driver->err_handler->error_detected) - return; - driver->err_handler->error_detected(dev, pci_channel_io_perm_failure); -} - -/* ------------------------------------------------------- */ -/** - * 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 - * occuring 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 - * Args: 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) -{ - int rc; - 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; - - /* New-style config addrs might be shared across multiple devices, - * Walk over all functions on this device */ - if (pe_dn->eeh_pe_config_addr) { - struct device_node *pe = pe_dn->node; - pe = pe->parent->child; - while (pe) { - struct pci_dn *ppe = PCI_DN(pe); - if (pe_dn->eeh_pe_config_addr == ppe->eeh_pe_config_addr) { - rtas_configure_bridge(ppe); - eeh_restore_bars(ppe); - } - pe = pe->sibling; - } - } else { - rtas_configure_bridge(pe_dn); - eeh_restore_bars(pe_dn); - } - - /* 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); - } - - 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 15 - -void 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; - - frozen_dn = find_device_pe(event->dn); - frozen_bus = pcibios_find_pci_bus(frozen_dn); - - if (!frozen_dn) { - printk(KERN_ERR "EEH: Error: Cannot find partition endpoint for %s\n", - pci_name(event->dev)); - return; - } - - /* 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 %s\n", - frozen_dn->full_name); - return; - } - -#if 0 - /* We may get "permanent failure" messages on empty slots. - * These are false alarms. Empty slots have no child dn. */ - if ((event->state == pci_channel_io_perm_failure) && (frozen_device == NULL)) - return; -#endif - - frozen_pdn = PCI_DN(frozen_dn); - frozen_pdn->eeh_freeze_count++; - - if (frozen_pdn->eeh_freeze_count > EEH_MAX_ALLOWED_FREEZES) - goto hard_fail; - - /* If the reset state is a '5' and the time to reset is 0 (infinity) - * or is more then 15 seconds, then mark this as a permanent failure. - */ - if ((event->state == pci_channel_io_perm_failure) && - ((event->time_unavail <= 0) || - (event->time_unavail > MAX_WAIT_FOR_RECOVERY*1000))) - goto hard_fail; - - eeh_slot_error_detail(frozen_pdn, 1 /* Temporary Error */); - printk(KERN_WARNING - "EEH: This PCI device has failed %d times since last reboot: %s - %s\n", - frozen_pdn->eeh_freeze_count, - pci_name (frozen_pdn->pcidev), - pcid_name(frozen_pdn->pcidev)); - - /* 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); - - /* 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) - 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) - goto hard_fail; - pci_walk_bus(frozen_bus, eeh_report_reset, 0); - } - - /* If all devices reported they can proceed, the re-enable PIO */ - if (result == PCI_ERS_RESULT_CAN_RECOVER) { - /* XXX Not supported; we brute-force reset the device */ - rc = eeh_reset_device(frozen_pdn, NULL); - if (rc) - goto hard_fail; - pci_walk_bus(frozen_bus, eeh_report_reset, 0); - } - - /* Tell all device drivers that they can resume operations */ - pci_walk_bus(frozen_bus, eeh_report_resume, 0); - - return; - -hard_fail: - /* - * 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 %s - %s has failed %d times \n" - "and has been permanently disabled. Please try reseating\n" - "this device or replacing it.\n", - pci_name (frozen_pdn->pcidev), - pcid_name(frozen_pdn->pcidev), - frozen_pdn->eeh_freeze_count); - - eeh_slot_error_detail(frozen_pdn, 2 /* Permanent Error */); - - /* Notify all devices that they're about to go down. */ - pci_walk_bus(frozen_bus, eeh_report_failure, 0); - - /* Shut down the device drivers for good. */ - pcibios_remove_pci_devices(frozen_bus); -} - -/* ---------- end of file ---------- */ |