diff options
Diffstat (limited to 'arch/powerpc/platforms/pseries/eeh.c')
| -rw-r--r-- | arch/powerpc/platforms/pseries/eeh.c | 138 |
1 files changed, 15 insertions, 123 deletions
diff --git a/arch/powerpc/platforms/pseries/eeh.c b/arch/powerpc/platforms/pseries/eeh.c index 9df1d501836..1fec99d5331 100644 --- a/arch/powerpc/platforms/pseries/eeh.c +++ b/arch/powerpc/platforms/pseries/eeh.c @@ -19,7 +19,6 @@ #include <linux/init.h> #include <linux/list.h> -#include <linux/notifier.h> #include <linux/pci.h> #include <linux/proc_fs.h> #include <linux/rbtree.h> @@ -27,12 +26,12 @@ #include <linux/spinlock.h> #include <asm/atomic.h> #include <asm/eeh.h> +#include <asm/eeh_event.h> #include <asm/io.h> #include <asm/machdep.h> +#include <asm/ppc-pci.h> #include <asm/rtas.h> -#include <asm/atomic.h> #include <asm/systemcfg.h> -#include <asm/ppc-pci.h> #undef DEBUG @@ -70,14 +69,6 @@ * and sent out for processing. */ -/* EEH event workqueue setup. */ -static DEFINE_SPINLOCK(eeh_eventlist_lock); -LIST_HEAD(eeh_eventlist); -static void eeh_event_handler(void *); -DECLARE_WORK(eeh_event_wq, eeh_event_handler, NULL); - -static struct notifier_block *eeh_notifier_chain; - /* If a device driver keeps reading an MMIO register in an interrupt * handler after a slot isolation event has occurred, we assume it * is broken and panic. This sets the threshold for how many read @@ -421,24 +412,6 @@ void eeh_slot_error_detail (struct pci_dn *pdn, int severity) } /** - * eeh_register_notifier - Register to find out about EEH events. - * @nb: notifier block to callback on events - */ -int eeh_register_notifier(struct notifier_block *nb) -{ - return notifier_chain_register(&eeh_notifier_chain, nb); -} - -/** - * eeh_unregister_notifier - Unregister to an EEH event notifier. - * @nb: notifier block to callback on events - */ -int eeh_unregister_notifier(struct notifier_block *nb) -{ - return notifier_chain_unregister(&eeh_notifier_chain, nb); -} - -/** * read_slot_reset_state - Read the reset state of a device node's slot * @dn: device node to read * @rets: array to return results in @@ -461,73 +434,6 @@ static int read_slot_reset_state(struct pci_dn *pdn, int rets[]) } /** - * eeh_panic - call panic() for an eeh event that cannot be handled. - * The philosophy of this routine is that it is better to panic and - * halt the OS than it is to risk possible data corruption by - * oblivious device drivers that don't know better. - * - * @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) -{ - /* - * XXX We should create a separate sysctl for this. - * - * 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) { - struct device_node *dn = pci_device_to_OF_node(dev); - eeh_slot_error_detail (PCI_DN(dn), 2 /* Permanent Error */); - panic("EEH: MMIO failure (%d) on device:%s\n", reset_state, - pci_name(dev)); - } - else { - __get_cpu_var(ignored_failures)++; - 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 - * 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. - * - * @dummy - unused - */ -static void eeh_event_handler(void *dummy) -{ - unsigned long flags; - struct eeh_event *event; - - while (1) { - spin_lock_irqsave(&eeh_eventlist_lock, flags); - event = NULL; - 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) - break; - - printk(KERN_INFO "EEH: MMIO failure (%d), notifiying device " - "%s\n", event->reset_state, - pci_name(event->dev)); - - notifier_call_chain (&eeh_notifier_chain, - EEH_NOTIFY_FREEZE, event); - - pci_dev_put(event->dev); - kfree(event); - } -} - -/** * eeh_token_to_phys - convert EEH address token to phys address * @token i/o token, should be address in the form 0xA.... */ @@ -613,8 +519,6 @@ int eeh_dn_check_failure(struct device_node *dn, struct pci_dev *dev) int ret; int rets[3]; unsigned long flags; - int reset_state; - struct eeh_event *event; struct pci_dn *pdn; struct device_node *pe_dn; int rc = 0; @@ -722,33 +626,12 @@ int eeh_dn_check_failure(struct device_node *dn, struct pci_dev *dev) __eeh_mark_slot (pe_dn); spin_unlock_irqrestore(&confirm_error_lock, flags); - reset_state = rets[0]; - - eeh_slot_error_detail (pdn, 1 /* Temporary Error */); - - printk(KERN_INFO "EEH: MMIO failure (%d) on device: %s %s\n", - rets[0], dn->name, dn->full_name); - event = kmalloc(sizeof(*event), GFP_ATOMIC); - if (event == NULL) { - eeh_panic(dev, reset_state); - return 1; - } - - event->dev = dev; - event->dn = dn; - event->reset_state = reset_state; - - /* 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); - + eeh_send_failure_event (dn, dev, rets[0], rets[2]); + /* Most EEH events are due to device driver bugs. Having * a stack trace will help the device-driver authors figure * out what happened. So print that out. */ if (rets[0] != 5) dump_stack(); - schedule_work(&eeh_event_wq); - return 1; dn_unlock: @@ -793,6 +676,14 @@ unsigned long eeh_check_failure(const volatile void __iomem *token, unsigned lon EXPORT_SYMBOL(eeh_check_failure); +/* ------------------------------------------------------------- */ +/* The code below deals with enabling EEH for devices during the + * early boot sequence. EEH must be enabled before any PCI probing + * can be done. + */ + +#define EEH_ENABLE 1 + struct eeh_early_enable_info { unsigned int buid_hi; unsigned int buid_lo; @@ -850,8 +741,9 @@ static void *early_enable_eeh(struct device_node *dn, void *data) /* First register entry is addr (00BBSS00) */ /* Try to enable eeh */ ret = rtas_call(ibm_set_eeh_option, 4, 1, NULL, - regs[0], info->buid_hi, info->buid_lo, - EEH_ENABLE); + regs[0], info->buid_hi, info->buid_lo, + EEH_ENABLE); + if (ret == 0) { eeh_subsystem_enabled = 1; pdn->eeh_mode |= EEH_MODE_SUPPORTED; |