diff options
Diffstat (limited to 'drivers/edac')
| -rw-r--r-- | drivers/edac/edac_device.c | 56 | ||||
| -rw-r--r-- | drivers/edac/edac_mc.c | 72 |
2 files changed, 100 insertions, 28 deletions
diff --git a/drivers/edac/edac_device.c b/drivers/edac/edac_device.c index 173f4ba0f7c..7e3723768ac 100644 --- a/drivers/edac/edac_device.c +++ b/drivers/edac/edac_device.c @@ -32,7 +32,9 @@ #include "edac_core.h" #include "edac_module.h" -/* lock to memory controller's control array 'edac_device_list' */ +/* lock for the list: 'edac_device_list', manipulation of this list + * is protected by the 'device_ctls_mutex' lock + */ static DEFINE_MUTEX(device_ctls_mutex); static struct list_head edac_device_list = LIST_HEAD_INIT(edac_device_list); @@ -386,6 +388,14 @@ EXPORT_SYMBOL_GPL(edac_device_find); /* * edac_device_workq_function * performs the operation scheduled by a workq request + * + * this workq is embedded within an edac_device_ctl_info + * structure, that needs to be polled for possible error events. + * + * This operation is to acquire the list mutex lock + * (thus preventing insertation or deletion) + * and then call the device's poll function IFF this device is + * running polled and there is a poll function defined. */ static void edac_device_workq_function(struct work_struct *work_req) { @@ -403,8 +413,17 @@ static void edac_device_workq_function(struct work_struct *work_req) mutex_unlock(&device_ctls_mutex); - /* Reschedule */ - queue_delayed_work(edac_workqueue, &edac_dev->work, edac_dev->delay); + /* Reschedule the workq for the next time period to start again + * if the number of msec is for 1 sec, then adjust to the next + * whole one second to save timers fireing all over the period + * between integral seconds + */ + if (edac_dev->poll_msec == 1000) + queue_delayed_work(edac_workqueue, &edac_dev->work, + round_jiffies(edac_dev->delay)); + else + queue_delayed_work(edac_workqueue, &edac_dev->work, + edac_dev->delay); } /* @@ -417,11 +436,26 @@ void edac_device_workq_setup(struct edac_device_ctl_info *edac_dev, { debugf0("%s()\n", __func__); + /* take the arg 'msec' and set it into the control structure + * to used in the time period calculation + * then calc the number of jiffies that represents + */ edac_dev->poll_msec = msec; - edac_dev->delay = msecs_to_jiffies(msec); /* Calc delay jiffies */ + edac_dev->delay = msecs_to_jiffies(msec); INIT_DELAYED_WORK(&edac_dev->work, edac_device_workq_function); - queue_delayed_work(edac_workqueue, &edac_dev->work, edac_dev->delay); + + /* optimize here for the 1 second case, which will be normal value, to + * fire ON the 1 second time event. This helps reduce all sorts of + * timers firing on sub-second basis, while they are happy + * to fire together on the 1 second exactly + */ + if (edac_dev->poll_msec == 1000) + queue_delayed_work(edac_workqueue, &edac_dev->work, + round_jiffies(edac_dev->delay)); + else + queue_delayed_work(edac_workqueue, &edac_dev->work, + edac_dev->delay); } /* @@ -441,16 +475,20 @@ void edac_device_workq_teardown(struct edac_device_ctl_info *edac_dev) /* * edac_device_reset_delay_period + * + * need to stop any outstanding workq queued up at this time + * because we will be resetting the sleep time. + * Then restart the workq on the new delay */ - void edac_device_reset_delay_period(struct edac_device_ctl_info *edac_dev, unsigned long value) { - mutex_lock(&device_ctls_mutex); - - /* cancel the current workq request */ + /* cancel the current workq request, without the mutex lock */ edac_device_workq_teardown(edac_dev); + /* acquire the mutex before doing the workq setup */ + mutex_lock(&device_ctls_mutex); + /* restart the workq request, with new delay value */ edac_device_workq_setup(edac_dev, value); diff --git a/drivers/edac/edac_mc.c b/drivers/edac/edac_mc.c index 2d53cb38868..4471be36259 100644 --- a/drivers/edac/edac_mc.c +++ b/drivers/edac/edac_mc.c @@ -258,6 +258,12 @@ static void edac_mc_workq_function(struct work_struct *work_req) mutex_lock(&mem_ctls_mutex); + /* if this control struct has movd to offline state, we are done */ + if (mci->op_state == OP_OFFLINE) { + mutex_unlock(&mem_ctls_mutex); + return; + } + /* Only poll controllers that are running polled and have a check */ if (edac_mc_assert_error_check_and_clear() && (mci->edac_check != NULL)) mci->edac_check(mci); @@ -279,11 +285,19 @@ static void edac_mc_workq_function(struct work_struct *work_req) * edac_mc_workq_setup * initialize a workq item for this mci * passing in the new delay period in msec + * + * locking model: + * + * called with the mem_ctls_mutex held */ -void edac_mc_workq_setup(struct mem_ctl_info *mci, unsigned msec) +static void edac_mc_workq_setup(struct mem_ctl_info *mci, unsigned msec) { debugf0("%s()\n", __func__); + /* if this instance is not in the POLL state, then simply return */ + if (mci->op_state != OP_RUNNING_POLL) + return; + INIT_DELAYED_WORK(&mci->work, edac_mc_workq_function); queue_delayed_work(edac_workqueue, &mci->work, msecs_to_jiffies(msec)); } @@ -291,29 +305,39 @@ void edac_mc_workq_setup(struct mem_ctl_info *mci, unsigned msec) /* * edac_mc_workq_teardown * stop the workq processing on this mci + * + * locking model: + * + * called WITHOUT lock held */ -void edac_mc_workq_teardown(struct mem_ctl_info *mci) +static void edac_mc_workq_teardown(struct mem_ctl_info *mci) { int status; - status = cancel_delayed_work(&mci->work); - if (status == 0) { - /* workq instance might be running, wait for it */ - flush_workqueue(edac_workqueue); + /* if not running POLL, leave now */ + if (mci->op_state == OP_RUNNING_POLL) { + status = cancel_delayed_work(&mci->work); + if (status == 0) { + debugf0("%s() not canceled, flush the queue\n", + __func__); + + /* workq instance might be running, wait for it */ + flush_workqueue(edac_workqueue); + } } } /* * edac_reset_delay_period */ - -void edac_reset_delay_period(struct mem_ctl_info *mci, unsigned long value) +static void edac_reset_delay_period(struct mem_ctl_info *mci, unsigned long value) { - mutex_lock(&mem_ctls_mutex); - /* cancel the current workq request */ edac_mc_workq_teardown(mci); + /* lock the list of devices for the new setup */ + mutex_lock(&mem_ctls_mutex); + /* restart the workq request, with new delay value */ edac_mc_workq_setup(mci, value); @@ -323,6 +347,10 @@ void edac_reset_delay_period(struct mem_ctl_info *mci, unsigned long value) /* Return 0 on success, 1 on failure. * Before calling this function, caller must * assign a unique value to mci->mc_idx. + * + * locking model: + * + * called with the mem_ctls_mutex lock held */ static int add_mc_to_global_list(struct mem_ctl_info *mci) { @@ -331,7 +359,8 @@ static int add_mc_to_global_list(struct mem_ctl_info *mci) insert_before = &mc_devices; - if (unlikely((p = find_mci_by_dev(mci->dev)) != NULL)) + p = find_mci_by_dev(mci->dev); + if (unlikely(p != NULL)) goto fail0; list_for_each(item, &mc_devices) { @@ -467,8 +496,8 @@ int edac_mc_add_mc(struct mem_ctl_info *mci) } /* Report action taken */ - edac_mc_printk(mci, KERN_INFO, "Giving out device to %s %s: DEV %s\n", - mci->mod_name, mci->ctl_name, dev_name(mci)); + edac_mc_printk(mci, KERN_INFO, "Giving out device to '%s' '%s':" + " DEV %s\n", mci->mod_name, mci->ctl_name, dev_name(mci)); mutex_unlock(&mem_ctls_mutex); return 0; @@ -493,10 +522,13 @@ struct mem_ctl_info *edac_mc_del_mc(struct device *dev) { struct mem_ctl_info *mci; - debugf0("MC: %s()\n", __func__); + debugf0("%s()\n", __func__); + mutex_lock(&mem_ctls_mutex); - if ((mci = find_mci_by_dev(dev)) == NULL) { + /* find the requested mci struct in the global list */ + mci = find_mci_by_dev(dev); + if (mci == NULL) { mutex_unlock(&mem_ctls_mutex); return NULL; } @@ -504,15 +536,17 @@ struct mem_ctl_info *edac_mc_del_mc(struct device *dev) /* marking MCI offline */ mci->op_state = OP_OFFLINE; - /* flush workq processes */ - edac_mc_workq_teardown(mci); - - edac_remove_sysfs_mci_device(mci); del_mc_from_global_list(mci); mutex_unlock(&mem_ctls_mutex); + + /* flush workq processes and remove sysfs */ + edac_mc_workq_teardown(mci); + edac_remove_sysfs_mci_device(mci); + edac_printk(KERN_INFO, EDAC_MC, "Removed device %d for %s %s: DEV %s\n", mci->mc_idx, mci->mod_name, mci->ctl_name, dev_name(mci)); + return mci; } EXPORT_SYMBOL_GPL(edac_mc_del_mc); |