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Diffstat (limited to 'arch/powerpc/kernel/eeh_event.c')
| -rw-r--r-- | arch/powerpc/kernel/eeh_event.c | 142 |
1 files changed, 142 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/eeh_event.c b/arch/powerpc/kernel/eeh_event.c new file mode 100644 index 0000000..185bedd --- /dev/null +++ b/arch/powerpc/kernel/eeh_event.c @@ -0,0 +1,142 @@ +/* + * 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. 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * + * Copyright (c) 2005 Linas Vepstas <linas@linas.org> + */ + +#include <linux/delay.h> +#include <linux/list.h> +#include <linux/mutex.h> +#include <linux/sched.h> +#include <linux/pci.h> +#include <linux/slab.h> +#include <linux/workqueue.h> +#include <linux/kthread.h> +#include <asm/eeh_event.h> +#include <asm/ppc-pci.h> + +/** Overview: + * EEH error states may be detected within exception handlers; + * however, the recovery processing needs to occur asynchronously + * in a normal kernel context and not an interrupt context. + * This pair of routines creates an event and queues it onto a + * work-queue, where a worker thread can drive recovery. + */ + +/* EEH event workqueue setup. */ +static DEFINE_SPINLOCK(eeh_eventlist_lock); +LIST_HEAD(eeh_eventlist); +static void eeh_thread_launcher(struct work_struct *); +DECLARE_WORK(eeh_event_wq, eeh_thread_launcher); + +/* Serialize reset sequences for a given pci device */ +DEFINE_MUTEX(eeh_event_mutex); + +/** + * eeh_event_handler - Dispatch EEH events. + * @dummy - unused + * + * The detection of a frozen slot can occur inside an interrupt, + * where it can be hard to do anything about it. The goal of this + * routine is to pull these detection events out of the context + * of the interrupt handler, and re-dispatch them for processing + * at a later time in a normal context. + */ +static int eeh_event_handler(void * dummy) +{ + unsigned long flags; + struct eeh_event *event; + struct eeh_pe *pe; + + 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); + } + spin_unlock_irqrestore(&eeh_eventlist_lock, flags); + + if (event == NULL) + return 0; + + /* Serialize processing of EEH events */ + mutex_lock(&eeh_event_mutex); + pe = event->pe; + eeh_pe_state_mark(pe, EEH_PE_RECOVERING); + pr_info("EEH: Detected PCI bus error on PHB#%d-PE#%x\n", + pe->phb->global_number, pe->addr); + + set_current_state(TASK_INTERRUPTIBLE); /* Don't add to load average */ + eeh_handle_event(pe); + eeh_pe_state_clear(pe, EEH_PE_RECOVERING); + + kfree(event); + mutex_unlock(&eeh_event_mutex); + + /* If there are no new errors after an hour, clear the counter. */ + if (pe && pe->freeze_count > 0) { + msleep_interruptible(3600*1000); + if (pe->freeze_count > 0) + pe->freeze_count--; + + } + + return 0; +} + +/** + * eeh_thread_launcher - Start kernel thread to handle EEH events + * @dummy - unused + * + * This routine is called to start the kernel thread for processing + * EEH event. + */ +static void eeh_thread_launcher(struct work_struct *dummy) +{ + if (IS_ERR(kthread_run(eeh_event_handler, NULL, "eehd"))) + printk(KERN_ERR "Failed to start EEH daemon\n"); +} + +/** + * eeh_send_failure_event - Generate a PCI error event + * @pe: EEH PE + * + * This routine can be called within an interrupt context; + * the actual event will be delivered in a normal context + * (from a workqueue). + */ +int eeh_send_failure_event(struct eeh_pe *pe) +{ + unsigned long flags; + struct eeh_event *event; + + event = kzalloc(sizeof(*event), GFP_ATOMIC); + if (!event) { + pr_err("EEH: out of memory, event not handled\n"); + return -ENOMEM; + } + event->pe = pe; + + /* We may or may not be called in an interrupt context */ + spin_lock_irqsave(&eeh_eventlist_lock, flags); + list_add(&event->list, &eeh_eventlist); + spin_unlock_irqrestore(&eeh_eventlist_lock, flags); + + schedule_work(&eeh_event_wq); + + return 0; +} |