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1f52f17614
PHB, PE (and by association MVE) numbers are printed as a mix of decimal and hexadecimal throughout the kernel. This can be misleading, so make them all hexadecimal. Standardising on hex instead of dec because: - PHB numbers are presented in hex in sysfs/debugfs (and lspci, etc) - PE numbers are presented as hex in sysfs and parsed in hex in debugfs The only place I think this could cause confusing are the messages during boot, i.e. pci 000a:01 : [PE# 000] Secondary bus 1 associated with PE#0 which can be a quick way to check PE numbers. pe_level_printk() will only print two characters instead of three, so the above would be pci 000a:01 : [PE# 00] Secondary bus 1 associated with PE#0 which gives a hint it's in hex. Signed-off-by: Russell Currey <ruscur@russell.cc> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
197 lines
5.2 KiB
C
197 lines
5.2 KiB
C
/*
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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
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* (at 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,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* Copyright (c) 2005 Linas Vepstas <linas@linas.org>
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*/
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#include <linux/delay.h>
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#include <linux/list.h>
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#include <linux/sched.h>
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#include <linux/semaphore.h>
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#include <linux/pci.h>
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#include <linux/slab.h>
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#include <linux/kthread.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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* however, the recovery processing needs to occur asynchronously
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* in a normal kernel context and not an interrupt context.
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* This pair of routines creates an event and queues it onto a
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* work-queue, where a worker thread can drive recovery.
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*/
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static DEFINE_SPINLOCK(eeh_eventlist_lock);
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static struct semaphore eeh_eventlist_sem;
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static LIST_HEAD(eeh_eventlist);
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/**
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* eeh_event_handler - Dispatch EEH events.
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* @dummy - unused
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*
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* The detection of a frozen slot can occur inside an interrupt,
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* where it can be hard to do anything about it. The goal of this
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* routine is to pull these detection events out of the context
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* of the interrupt handler, and re-dispatch them for processing
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* at a later time in a normal context.
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*/
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static int eeh_event_handler(void * dummy)
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{
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unsigned long flags;
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struct eeh_event *event;
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struct eeh_pe *pe;
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while (!kthread_should_stop()) {
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if (down_interruptible(&eeh_eventlist_sem))
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break;
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/* Fetch EEH event from the queue */
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spin_lock_irqsave(&eeh_eventlist_lock, flags);
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event = NULL;
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if (!list_empty(&eeh_eventlist)) {
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event = list_entry(eeh_eventlist.next,
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struct eeh_event, list);
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list_del(&event->list);
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}
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spin_unlock_irqrestore(&eeh_eventlist_lock, flags);
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if (!event)
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continue;
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/* We might have event without binding PE */
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pe = event->pe;
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if (pe) {
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eeh_pe_state_mark(pe, EEH_PE_RECOVERING);
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if (pe->type & EEH_PE_PHB)
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pr_info("EEH: Detected error on PHB#%x\n",
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pe->phb->global_number);
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else
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pr_info("EEH: Detected PCI bus error on "
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"PHB#%x-PE#%x\n",
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pe->phb->global_number, pe->addr);
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eeh_handle_event(pe);
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eeh_pe_state_clear(pe, EEH_PE_RECOVERING);
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} else {
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eeh_handle_event(NULL);
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}
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kfree(event);
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}
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return 0;
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}
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/**
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* eeh_event_init - Start kernel thread to handle EEH events
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*
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* This routine is called to start the kernel thread for processing
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* EEH event.
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*/
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int eeh_event_init(void)
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{
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struct task_struct *t;
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int ret = 0;
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/* Initialize semaphore */
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sema_init(&eeh_eventlist_sem, 0);
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t = kthread_run(eeh_event_handler, NULL, "eehd");
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if (IS_ERR(t)) {
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ret = PTR_ERR(t);
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pr_err("%s: Failed to start EEH daemon (%d)\n",
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__func__, ret);
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return ret;
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}
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return 0;
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}
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/**
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* eeh_send_failure_event - Generate a PCI error event
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* @pe: EEH PE
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*
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* This routine can be called within an interrupt context;
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* the actual event will be delivered in a normal context
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* (from a workqueue).
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*/
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int eeh_send_failure_event(struct eeh_pe *pe)
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{
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unsigned long flags;
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struct eeh_event *event;
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event = kzalloc(sizeof(*event), GFP_ATOMIC);
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if (!event) {
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pr_err("EEH: out of memory, event not handled\n");
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return -ENOMEM;
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}
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event->pe = pe;
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/* We may or may not be called in an interrupt context */
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spin_lock_irqsave(&eeh_eventlist_lock, flags);
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list_add(&event->list, &eeh_eventlist);
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spin_unlock_irqrestore(&eeh_eventlist_lock, flags);
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/* For EEH deamon to knick in */
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up(&eeh_eventlist_sem);
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return 0;
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}
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/**
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* eeh_remove_event - Remove EEH event from the queue
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* @pe: Event binding to the PE
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* @force: Event will be removed unconditionally
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*
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* On PowerNV platform, we might have subsequent coming events
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* is part of the former one. For that case, those subsequent
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* coming events are totally duplicated and unnecessary, thus
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* they should be removed.
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*/
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void eeh_remove_event(struct eeh_pe *pe, bool force)
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{
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unsigned long flags;
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struct eeh_event *event, *tmp;
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/*
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* If we have NULL PE passed in, we have dead IOC
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* or we're sure we can report all existing errors
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* by the caller.
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*
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* With "force", the event with associated PE that
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* have been isolated, the event won't be removed
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* to avoid event lost.
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*/
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spin_lock_irqsave(&eeh_eventlist_lock, flags);
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list_for_each_entry_safe(event, tmp, &eeh_eventlist, list) {
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if (!force && event->pe &&
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(event->pe->state & EEH_PE_ISOLATED))
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continue;
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if (!pe) {
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list_del(&event->list);
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kfree(event);
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} else if (pe->type & EEH_PE_PHB) {
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if (event->pe && event->pe->phb == pe->phb) {
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list_del(&event->list);
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kfree(event);
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}
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} else if (event->pe == pe) {
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list_del(&event->list);
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kfree(event);
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}
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}
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spin_unlock_irqrestore(&eeh_eventlist_lock, flags);
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}
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