405 lines
12 KiB
C
405 lines
12 KiB
C
/*
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* PCI Error Recovery Driver for RPA-compliant PPC64 platform.
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* Copyright (C) 2004, 2005 Linas Vepstas <linas@linas.org>
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*
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* All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or (at
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* your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
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* NON INFRINGEMENT. See the GNU General Public License for more
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* details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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* Send feedback to <linas@us.ibm.com>
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*
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*/
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#include <linux/delay.h>
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#include <linux/interrupt.h>
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#include <linux/irq.h>
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#include <linux/pci.h>
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#include <asm/eeh.h>
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#include <asm/eeh_event.h>
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#include <asm/ppc-pci.h>
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#include <asm/pci-bridge.h>
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#include <asm/prom.h>
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#include <asm/rtas.h>
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static inline const char * pcid_name (struct pci_dev *pdev)
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{
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if (pdev && pdev->dev.driver)
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return pdev->dev.driver->name;
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return "";
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}
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#ifdef DEBUG
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static void print_device_node_tree (struct pci_dn *pdn, int dent)
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{
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int i;
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if (!pdn) return;
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for (i=0;i<dent; i++)
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printk(" ");
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printk("dn=%s mode=%x \tcfg_addr=%x pe_addr=%x \tfull=%s\n",
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pdn->node->name, pdn->eeh_mode, pdn->eeh_config_addr,
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pdn->eeh_pe_config_addr, pdn->node->full_name);
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dent += 3;
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struct device_node *pc = pdn->node->child;
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while (pc) {
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print_device_node_tree(PCI_DN(pc), dent);
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pc = pc->sibling;
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}
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}
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#endif
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/**
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* irq_in_use - return true if this irq is being used
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*/
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static int irq_in_use(unsigned int irq)
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{
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int rc = 0;
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unsigned long flags;
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struct irq_desc *desc = irq_desc + irq;
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spin_lock_irqsave(&desc->lock, flags);
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if (desc->action)
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rc = 1;
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spin_unlock_irqrestore(&desc->lock, flags);
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return rc;
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}
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/* ------------------------------------------------------- */
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/** eeh_report_error - report an EEH error to each device,
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* collect up and merge the device responses.
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*/
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static void eeh_report_error(struct pci_dev *dev, void *userdata)
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{
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enum pci_ers_result rc, *res = userdata;
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struct pci_driver *driver = dev->driver;
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dev->error_state = pci_channel_io_frozen;
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if (!driver)
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return;
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if (irq_in_use (dev->irq)) {
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struct device_node *dn = pci_device_to_OF_node(dev);
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PCI_DN(dn)->eeh_mode |= EEH_MODE_IRQ_DISABLED;
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disable_irq_nosync(dev->irq);
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}
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if (!driver->err_handler)
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return;
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if (!driver->err_handler->error_detected)
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return;
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rc = driver->err_handler->error_detected (dev, pci_channel_io_frozen);
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if (*res == PCI_ERS_RESULT_NONE) *res = rc;
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if (*res == PCI_ERS_RESULT_NEED_RESET) return;
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if (*res == PCI_ERS_RESULT_DISCONNECT &&
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rc == PCI_ERS_RESULT_NEED_RESET) *res = rc;
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}
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/** eeh_report_reset -- tell this device that the pci slot
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* has been reset.
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*/
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static void eeh_report_reset(struct pci_dev *dev, void *userdata)
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{
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struct pci_driver *driver = dev->driver;
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struct device_node *dn = pci_device_to_OF_node(dev);
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if (!driver)
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return;
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if ((PCI_DN(dn)->eeh_mode) & EEH_MODE_IRQ_DISABLED) {
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PCI_DN(dn)->eeh_mode &= ~EEH_MODE_IRQ_DISABLED;
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enable_irq(dev->irq);
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}
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if (!driver->err_handler)
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return;
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if (!driver->err_handler->slot_reset)
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return;
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driver->err_handler->slot_reset(dev);
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}
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static void eeh_report_resume(struct pci_dev *dev, void *userdata)
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{
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struct pci_driver *driver = dev->driver;
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dev->error_state = pci_channel_io_normal;
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if (!driver)
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return;
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if (!driver->err_handler)
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return;
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if (!driver->err_handler->resume)
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return;
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driver->err_handler->resume(dev);
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}
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static void eeh_report_failure(struct pci_dev *dev, void *userdata)
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{
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struct pci_driver *driver = dev->driver;
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dev->error_state = pci_channel_io_perm_failure;
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if (!driver)
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return;
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if (irq_in_use (dev->irq)) {
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struct device_node *dn = pci_device_to_OF_node(dev);
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PCI_DN(dn)->eeh_mode |= EEH_MODE_IRQ_DISABLED;
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disable_irq_nosync(dev->irq);
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}
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if (!driver->err_handler)
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return;
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if (!driver->err_handler->error_detected)
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return;
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driver->err_handler->error_detected(dev, pci_channel_io_perm_failure);
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}
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/* ------------------------------------------------------- */
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/**
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* handle_eeh_events -- reset a PCI device after hard lockup.
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*
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* pSeries systems will isolate a PCI slot if the PCI-Host
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* bridge detects address or data parity errors, DMA's
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* occurring to wild addresses (which usually happen due to
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* bugs in device drivers or in PCI adapter firmware).
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* Slot isolations also occur if #SERR, #PERR or other misc
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* PCI-related errors are detected.
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*
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* Recovery process consists of unplugging the device driver
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* (which generated hotplug events to userspace), then issuing
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* a PCI #RST to the device, then reconfiguring the PCI config
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* space for all bridges & devices under this slot, and then
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* finally restarting the device drivers (which cause a second
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* set of hotplug events to go out to userspace).
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*/
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/**
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* eeh_reset_device() -- perform actual reset of a pci slot
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* Args: bus: pointer to the pci bus structure corresponding
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* to the isolated slot. A non-null value will
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* cause all devices under the bus to be removed
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* and then re-added.
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* pe_dn: pointer to a "Partionable Endpoint" device node.
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* This is the top-level structure on which pci
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* bus resets can be performed.
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*/
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static int eeh_reset_device (struct pci_dn *pe_dn, struct pci_bus *bus)
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{
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int cnt, rc;
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/* pcibios will clear the counter; save the value */
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cnt = pe_dn->eeh_freeze_count;
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if (bus)
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pcibios_remove_pci_devices(bus);
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/* Reset the pci controller. (Asserts RST#; resets config space).
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* Reconfigure bridges and devices. Don't try to bring the system
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* up if the reset failed for some reason. */
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rc = rtas_set_slot_reset(pe_dn);
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if (rc)
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return rc;
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/* New-style config addrs might be shared across multiple devices,
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* Walk over all functions on this device */
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if (pe_dn->eeh_pe_config_addr) {
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struct device_node *pe = pe_dn->node;
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pe = pe->parent->child;
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while (pe) {
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struct pci_dn *ppe = PCI_DN(pe);
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if (pe_dn->eeh_pe_config_addr == ppe->eeh_pe_config_addr) {
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rtas_configure_bridge(ppe);
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eeh_restore_bars(ppe);
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}
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pe = pe->sibling;
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}
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} else {
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rtas_configure_bridge(pe_dn);
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eeh_restore_bars(pe_dn);
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}
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/* Give the system 5 seconds to finish running the user-space
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* hotplug shutdown scripts, e.g. ifdown for ethernet. Yes,
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* this is a hack, but if we don't do this, and try to bring
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* the device up before the scripts have taken it down,
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* potentially weird things happen.
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*/
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if (bus) {
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ssleep (5);
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pcibios_add_pci_devices(bus);
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}
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pe_dn->eeh_freeze_count = cnt;
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return 0;
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}
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/* The longest amount of time to wait for a pci device
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* to come back on line, in seconds.
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*/
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#define MAX_WAIT_FOR_RECOVERY 15
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struct pci_dn * handle_eeh_events (struct eeh_event *event)
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{
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struct device_node *frozen_dn;
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struct pci_dn *frozen_pdn;
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struct pci_bus *frozen_bus;
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int rc = 0;
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enum pci_ers_result result = PCI_ERS_RESULT_NONE;
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const char *location, *pci_str, *drv_str;
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frozen_dn = find_device_pe(event->dn);
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frozen_bus = pcibios_find_pci_bus(frozen_dn);
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if (!frozen_dn) {
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location = (char *) get_property(event->dn, "ibm,loc-code", NULL);
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location = location ? location : "unknown";
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printk(KERN_ERR "EEH: Error: Cannot find partition endpoint "
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"for location=%s pci addr=%s\n",
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location, pci_name(event->dev));
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return NULL;
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}
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location = (char *) get_property(frozen_dn, "ibm,loc-code", NULL);
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location = location ? location : "unknown";
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/* There are two different styles for coming up with the PE.
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* In the old style, it was the highest EEH-capable device
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* which was always an EADS pci bridge. In the new style,
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* there might not be any EADS bridges, and even when there are,
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* the firmware marks them as "EEH incapable". So another
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* two-step is needed to find the pci bus.. */
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if (!frozen_bus)
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frozen_bus = pcibios_find_pci_bus (frozen_dn->parent);
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if (!frozen_bus) {
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printk(KERN_ERR "EEH: Cannot find PCI bus "
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"for location=%s dn=%s\n",
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location, frozen_dn->full_name);
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return NULL;
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}
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#if 0
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/* We may get "permanent failure" messages on empty slots.
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* These are false alarms. Empty slots have no child dn. */
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if ((event->state == pci_channel_io_perm_failure) && (frozen_device == NULL))
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return;
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#endif
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frozen_pdn = PCI_DN(frozen_dn);
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frozen_pdn->eeh_freeze_count++;
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if (frozen_pdn->pcidev) {
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pci_str = pci_name (frozen_pdn->pcidev);
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drv_str = pcid_name (frozen_pdn->pcidev);
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} else {
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pci_str = pci_name (event->dev);
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drv_str = pcid_name (event->dev);
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}
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if (frozen_pdn->eeh_freeze_count > EEH_MAX_ALLOWED_FREEZES)
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goto excess_failures;
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/* If the reset state is a '5' and the time to reset is 0 (infinity)
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* or is more then 15 seconds, then mark this as a permanent failure.
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*/
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if ((event->state == pci_channel_io_perm_failure) &&
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((event->time_unavail <= 0) ||
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(event->time_unavail > MAX_WAIT_FOR_RECOVERY*1000)))
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goto hard_fail;
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eeh_slot_error_detail(frozen_pdn, 1 /* Temporary Error */);
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printk(KERN_WARNING
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"EEH: This PCI device has failed %d times since last reboot: "
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"location=%s driver=%s pci addr=%s\n",
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frozen_pdn->eeh_freeze_count, location, drv_str, pci_str);
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/* Walk the various device drivers attached to this slot through
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* a reset sequence, giving each an opportunity to do what it needs
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* to accomplish the reset. Each child gets a report of the
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* status ... if any child can't handle the reset, then the entire
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* slot is dlpar removed and added.
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*/
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pci_walk_bus(frozen_bus, eeh_report_error, &result);
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/* If all device drivers were EEH-unaware, then shut
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* down all of the device drivers, and hope they
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* go down willingly, without panicing the system.
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*/
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if (result == PCI_ERS_RESULT_NONE) {
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rc = eeh_reset_device(frozen_pdn, frozen_bus);
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if (rc)
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goto hard_fail;
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}
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/* If any device called out for a reset, then reset the slot */
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if (result == PCI_ERS_RESULT_NEED_RESET) {
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rc = eeh_reset_device(frozen_pdn, NULL);
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if (rc)
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goto hard_fail;
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pci_walk_bus(frozen_bus, eeh_report_reset, NULL);
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}
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/* If all devices reported they can proceed, the re-enable PIO */
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if (result == PCI_ERS_RESULT_CAN_RECOVER) {
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/* XXX Not supported; we brute-force reset the device */
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rc = eeh_reset_device(frozen_pdn, NULL);
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if (rc)
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goto hard_fail;
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pci_walk_bus(frozen_bus, eeh_report_reset, NULL);
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}
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/* Tell all device drivers that they can resume operations */
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pci_walk_bus(frozen_bus, eeh_report_resume, NULL);
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return frozen_pdn;
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excess_failures:
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/*
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* About 90% of all real-life EEH failures in the field
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* are due to poorly seated PCI cards. Only 10% or so are
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* due to actual, failed cards.
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*/
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printk(KERN_ERR
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"EEH: PCI device at location=%s driver=%s pci addr=%s \n"
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"has failed %d times and has been permanently disabled. \n"
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"Please try reseating this device or replacing it.\n",
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location, drv_str, pci_str, frozen_pdn->eeh_freeze_count);
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goto perm_error;
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hard_fail:
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printk(KERN_ERR
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"EEH: Unable to recover from failure of PCI device "
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"at location=%s driver=%s pci addr=%s \n"
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"Please try reseating this device or replacing it.\n",
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location, drv_str, pci_str);
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perm_error:
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eeh_slot_error_detail(frozen_pdn, 2 /* Permanent Error */);
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/* Notify all devices that they're about to go down. */
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pci_walk_bus(frozen_bus, eeh_report_failure, NULL);
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/* Shut down the device drivers for good. */
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pcibios_remove_pci_devices(frozen_bus);
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return NULL;
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}
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/* ---------- end of file ---------- */
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