[PATCH] powerpc: PCI Error Recovery: PPC64 core recovery routines
Various PCI bus errors can be signaled by newer PCI controllers. The core error recovery routines are architecture dependent. This patch adds a recovery infrastructure for the PPC64 pSeries systems. Signed-off-by: Linas Vepstas <linas@austin.ibm.com> Signed-off-by: Paul Mackerras <paulus@samba.org> (cherry picked from e8ca11b460c4c9c7fa6b529be221529ebd770e38 commit)
This commit is contained in:
Linas Vepstas
Paul Mackerras
parent
977127174a
commit
77bd741561
7 changed files with 413 additions and 35 deletions
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@ -4,7 +4,7 @@ obj-$(CONFIG_SMP) += smp.o
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obj-$(CONFIG_IBMVIO) += vio.o
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obj-$(CONFIG_XICS) += xics.o
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obj-$(CONFIG_SCANLOG) += scanlog.o
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obj-$(CONFIG_EEH) += eeh.o eeh_event.o
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obj-$(CONFIG_EEH) += eeh.o eeh_driver.o eeh_event.o
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obj-$(CONFIG_HVC_CONSOLE) += hvconsole.o
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obj-$(CONFIG_HVCS) += hvcserver.o
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@ -485,6 +485,11 @@ static void __eeh_mark_slot (struct device_node *dn, int mode_flag)
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if (PCI_DN(dn)) {
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PCI_DN(dn)->eeh_mode |= mode_flag;
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/* Mark the pci device driver too */
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struct pci_dev *dev = PCI_DN(dn)->pcidev;
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if (dev && dev->driver)
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dev->error_state = pci_channel_io_frozen;
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if (dn->child)
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__eeh_mark_slot (dn->child, mode_flag);
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}
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@ -544,6 +549,7 @@ int eeh_dn_check_failure(struct device_node *dn, struct pci_dev *dev)
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int rets[3];
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unsigned long flags;
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struct pci_dn *pdn;
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enum pci_channel_state state;
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int rc = 0;
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__get_cpu_var(total_mmio_ffs)++;
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@ -648,8 +654,13 @@ int eeh_dn_check_failure(struct device_node *dn, struct pci_dev *dev)
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eeh_mark_slot (dn, EEH_MODE_ISOLATED);
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spin_unlock_irqrestore(&confirm_error_lock, flags);
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eeh_send_failure_event (dn, dev, rets[0], rets[2]);
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state = pci_channel_io_normal;
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if ((rets[0] == 2) || (rets[0] == 4))
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state = pci_channel_io_frozen;
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if (rets[0] == 5)
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state = pci_channel_io_perm_failure;
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eeh_send_failure_event (dn, dev, state, rets[2]);
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/* Most EEH events are due to device driver bugs. Having
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* a stack trace will help the device-driver authors figure
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* out what happened. So print that out. */
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@ -953,8 +964,10 @@ static void *early_enable_eeh(struct device_node *dn, void *data)
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* But there are a few cases like display devices that make sense.
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*/
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enable = 1; /* i.e. we will do checking */
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#if 0
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if ((*class_code >> 16) == PCI_BASE_CLASS_DISPLAY)
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enable = 0;
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#endif
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if (!enable)
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pdn->eeh_mode |= EEH_MODE_NOCHECK;
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366
arch/powerpc/platforms/pseries/eeh_driver.c
Normal file
366
arch/powerpc/platforms/pseries/eeh_driver.c
Normal file
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@ -0,0 +1,366 @@
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/*
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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/irq.h>
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#include <linux/interrupt.h>
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#include <linux/notifier.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->dev.driver)
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return pdev->dev.driver->name;
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return "";
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}
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/**
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* Return the "partitionable endpoint" (pe) under which this device lies
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*/
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static struct device_node * find_device_pe(struct device_node *dn)
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{
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while ((dn->parent) && PCI_DN(dn->parent) &&
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(PCI_DN(dn->parent)->eeh_mode & EEH_MODE_SUPPORTED)) {
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dn = dn->parent;
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}
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return dn;
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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 pcierr_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 == PCIERR_RESULT_NONE) *res = rc;
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if (*res == PCIERR_RESULT_NEED_RESET) return;
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if (*res == PCIERR_RESULT_DISCONNECT &&
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rc == PCIERR_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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* occuring 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 void eeh_reset_device (struct pci_dn *pe_dn, struct pci_bus *bus)
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{
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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 */
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rtas_set_slot_reset(pe_dn);
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/* Walk over all functions on this device */
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rtas_configure_bridge(pe_dn);
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eeh_restore_bars(pe_dn);
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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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}
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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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void 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 perm_failure = 0;
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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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printk(KERN_ERR "EEH: Error: Cannot find partition endpoint for %s\n",
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pci_name(event->dev));
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return;
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}
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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 for %s\n",
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frozen_dn->full_name);
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return;
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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->eeh_freeze_count > EEH_MAX_ALLOWED_FREEZES)
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perm_failure = 1;
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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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{
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perm_failure = 1;
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}
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/* Log the error with the rtas logger. */
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if (perm_failure) {
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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 %s - %s has failed %d times \n"
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"and has been permanently disabled. Please try reseating\n"
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"this device or replacing it.\n",
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pci_name (frozen_pdn->pcidev),
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pcid_name(frozen_pdn->pcidev),
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frozen_pdn->eeh_freeze_count);
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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, 0);
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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;
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}
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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: %s - %s\n",
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frozen_pdn->eeh_freeze_count,
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pci_name (frozen_pdn->pcidev),
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pcid_name(frozen_pdn->pcidev));
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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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enum pcierr_result result = PCIERR_RESULT_NONE;
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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 == PCIERR_RESULT_NONE) {
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eeh_reset_device(frozen_pdn, frozen_bus);
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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 == PCIERR_RESULT_NEED_RESET) {
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eeh_reset_device(frozen_pdn, NULL);
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pci_walk_bus(frozen_bus, eeh_report_reset, 0);
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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 == PCIERR_RESULT_CAN_RECOVER) {
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/* XXX Not supported; we brute-force reset the device */
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eeh_reset_device(frozen_pdn, NULL);
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pci_walk_bus(frozen_bus, eeh_report_reset, 0);
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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, 0);
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}
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/* ---------- end of file ---------- */
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@ -21,6 +21,7 @@
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#include <linux/list.h>
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#include <linux/pci.h>
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#include <asm/eeh_event.h>
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#include <asm/ppc-pci.h>
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/** Overview:
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* EEH error states may be detected within exception handlers;
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@ -36,31 +37,6 @@ LIST_HEAD(eeh_eventlist);
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static void eeh_thread_launcher(void *);
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DECLARE_WORK(eeh_event_wq, eeh_thread_launcher, NULL);
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/**
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* eeh_panic - call panic() for an eeh event that cannot be handled.
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* The philosophy of this routine is that it is better to panic and
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* halt the OS than it is to risk possible data corruption by
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* oblivious device drivers that don't know better.
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*
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||||
* @dev pci device that had an eeh event
|
||||
* @reset_state current reset state of the device slot
|
||||
*/
|
||||
static void eeh_panic(struct pci_dev *dev, int reset_state)
|
||||
{
|
||||
/*
|
||||
* Since the panic_on_oops sysctl is used to halt the system
|
||||
* in light of potential corruption, we can use it here.
|
||||
*/
|
||||
if (panic_on_oops) {
|
||||
panic("EEH: MMIO failure (%d) on device:%s\n", reset_state,
|
||||
pci_name(dev));
|
||||
}
|
||||
else {
|
||||
printk(KERN_INFO "EEH: Ignored MMIO failure (%d) on device:%s\n",
|
||||
reset_state, pci_name(dev));
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* eeh_event_handler - dispatch EEH events. The detection of a frozen
|
||||
* slot can occur inside an interrupt, where it can be hard to do
|
||||
|
|
@ -82,10 +58,16 @@ static int eeh_event_handler(void * dummy)
|
|||
|
||||
spin_lock_irqsave(&eeh_eventlist_lock, flags);
|
||||
event = NULL;
|
||||
|
||||
/* Unqueue the event, get ready to process. */
|
||||
if (!list_empty(&eeh_eventlist)) {
|
||||
event = list_entry(eeh_eventlist.next, struct eeh_event, list);
|
||||
list_del(&event->list);
|
||||
}
|
||||
|
||||
if (event)
|
||||
eeh_mark_slot(event->dn, EEH_MODE_RECOVERING);
|
||||
|
||||
spin_unlock_irqrestore(&eeh_eventlist_lock, flags);
|
||||
if (event == NULL)
|
||||
break;
|
||||
|
|
@ -93,8 +75,11 @@ static int eeh_event_handler(void * dummy)
|
|||
printk(KERN_INFO "EEH: Detected PCI bus error on device %s\n",
|
||||
pci_name(event->dev));
|
||||
|
||||
eeh_panic (event->dev, event->state);
|
||||
handle_eeh_events(event);
|
||||
|
||||
eeh_clear_slot(event->dn, EEH_MODE_RECOVERING);
|
||||
|
||||
pci_dev_put(event->dev);
|
||||
kfree(event);
|
||||
}
|
||||
|
||||
|
|
@ -122,7 +107,7 @@ static void eeh_thread_launcher(void *dummy)
|
|||
*/
|
||||
int eeh_send_failure_event (struct device_node *dn,
|
||||
struct pci_dev *dev,
|
||||
int state,
|
||||
enum pci_channel_state state,
|
||||
int time_unavail)
|
||||
{
|
||||
unsigned long flags;
|
||||
|
|
|
|||
|
|
@ -34,9 +34,11 @@ struct device_node;
|
|||
extern int eeh_subsystem_enabled;
|
||||
|
||||
/* Values for eeh_mode bits in device_node */
|
||||
#define EEH_MODE_SUPPORTED (1<<0)
|
||||
#define EEH_MODE_NOCHECK (1<<1)
|
||||
#define EEH_MODE_ISOLATED (1<<2)
|
||||
#define EEH_MODE_SUPPORTED (1<<0)
|
||||
#define EEH_MODE_NOCHECK (1<<1)
|
||||
#define EEH_MODE_ISOLATED (1<<2)
|
||||
#define EEH_MODE_RECOVERING (1<<3)
|
||||
#define EEH_MODE_IRQ_DISABLED (1<<4)
|
||||
|
||||
/* Max number of EEH freezes allowed before we consider the device
|
||||
* to be permanently disabled. */
|
||||
|
|
|
|||
|
|
@ -30,7 +30,7 @@ struct eeh_event {
|
|||
struct list_head list;
|
||||
struct device_node *dn; /* struct device node */
|
||||
struct pci_dev *dev; /* affected device */
|
||||
int state;
|
||||
enum pci_channel_state state; /* PCI bus state for the affected device */
|
||||
int time_unavail; /* milliseconds until device might be available */
|
||||
};
|
||||
|
||||
|
|
@ -47,8 +47,11 @@ struct eeh_event {
|
|||
*/
|
||||
int eeh_send_failure_event (struct device_node *dn,
|
||||
struct pci_dev *dev,
|
||||
int reset_state,
|
||||
enum pci_channel_state state,
|
||||
int time_unavail);
|
||||
|
||||
/* Main recovery function */
|
||||
void handle_eeh_events (struct eeh_event *);
|
||||
|
||||
#endif /* __KERNEL__ */
|
||||
#endif /* ASM_PPC64_EEH_EVENT_H */
|
||||
|
|
|
|||
|
|
@ -52,6 +52,15 @@ extern unsigned long pci_probe_only;
|
|||
|
||||
/* ---- EEH internal-use-only related routines ---- */
|
||||
#ifdef CONFIG_EEH
|
||||
/**
|
||||
* eeh_slot_error_detail -- record and EEH error condition to the log
|
||||
* @severity: 1 if temporary, 2 if permanent failure.
|
||||
*
|
||||
* Obtains the the EEH error details from the RTAS subsystem,
|
||||
* and then logs these details with the RTAS error log system.
|
||||
*/
|
||||
void eeh_slot_error_detail (struct pci_dn *pdn, int severity);
|
||||
|
||||
/**
|
||||
* rtas_set_slot_reset -- unfreeze a frozen slot
|
||||
*
|
||||
|
|
|
|||
Loading…
Reference in a new issue