diff options
Diffstat (limited to 'drivers/edac/edac_device.c')
| -rw-r--r-- | drivers/edac/edac_device.c | 621 |
1 files changed, 621 insertions, 0 deletions
diff --git a/drivers/edac/edac_device.c b/drivers/edac/edac_device.c new file mode 100644 index 000000000..0689e1510 --- /dev/null +++ b/drivers/edac/edac_device.c @@ -0,0 +1,621 @@ + +/* + * edac_device.c + * (C) 2007 www.douglaskthompson.com + * + * This file may be distributed under the terms of the + * GNU General Public License. + * + * Written by Doug Thompson <norsk5@xmission.com> + * + * edac_device API implementation + * 19 Jan 2007 + */ + +#include <asm/page.h> +#include <linux/uaccess.h> +#include <linux/ctype.h> +#include <linux/highmem.h> +#include <linux/init.h> +#include <linux/jiffies.h> +#include <linux/module.h> +#include <linux/slab.h> +#include <linux/smp.h> +#include <linux/spinlock.h> +#include <linux/sysctl.h> +#include <linux/timer.h> + +#include "edac_device.h" +#include "edac_module.h" + +/* 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 LIST_HEAD(edac_device_list); + +/* Default workqueue processing interval on this instance, in msecs */ +#define DEFAULT_POLL_INTERVAL 1000 + +#ifdef CONFIG_EDAC_DEBUG +static void edac_device_dump_device(struct edac_device_ctl_info *edac_dev) +{ + edac_dbg(3, "\tedac_dev = %p dev_idx=%d\n", + edac_dev, edac_dev->dev_idx); + edac_dbg(4, "\tedac_dev->edac_check = %p\n", edac_dev->edac_check); + edac_dbg(3, "\tdev = %p\n", edac_dev->dev); + edac_dbg(3, "\tmod_name:ctl_name = %s:%s\n", + edac_dev->mod_name, edac_dev->ctl_name); + edac_dbg(3, "\tpvt_info = %p\n\n", edac_dev->pvt_info); +} +#endif /* CONFIG_EDAC_DEBUG */ + +/* + * @off_val: zero, 1, or other based offset + */ +struct edac_device_ctl_info * +edac_device_alloc_ctl_info(unsigned pvt_sz, char *dev_name, unsigned nr_instances, + char *blk_name, unsigned nr_blocks, unsigned off_val, + struct edac_dev_sysfs_block_attribute *attrib_spec, + unsigned nr_attrib, int device_index) +{ + struct edac_dev_sysfs_block_attribute *dev_attrib, *attrib_p, *attrib; + struct edac_device_block *dev_blk, *blk_p, *blk; + struct edac_device_instance *dev_inst, *inst; + struct edac_device_ctl_info *dev_ctl; + unsigned instance, block, attr; + void *pvt; + int err; + + edac_dbg(4, "instances=%d blocks=%d\n", nr_instances, nr_blocks); + + dev_ctl = kzalloc(sizeof(struct edac_device_ctl_info), GFP_KERNEL); + if (!dev_ctl) + return NULL; + + dev_inst = kcalloc(nr_instances, sizeof(struct edac_device_instance), GFP_KERNEL); + if (!dev_inst) + goto free; + + dev_ctl->instances = dev_inst; + + dev_blk = kcalloc(nr_instances * nr_blocks, sizeof(struct edac_device_block), GFP_KERNEL); + if (!dev_blk) + goto free; + + dev_ctl->blocks = dev_blk; + + if (nr_attrib) { + dev_attrib = kcalloc(nr_attrib, sizeof(struct edac_dev_sysfs_block_attribute), + GFP_KERNEL); + if (!dev_attrib) + goto free; + + dev_ctl->attribs = dev_attrib; + } + + if (pvt_sz) { + pvt = kzalloc(pvt_sz, GFP_KERNEL); + if (!pvt) + goto free; + + dev_ctl->pvt_info = pvt; + } + + dev_ctl->dev_idx = device_index; + dev_ctl->nr_instances = nr_instances; + + /* Default logging of CEs and UEs */ + dev_ctl->log_ce = 1; + dev_ctl->log_ue = 1; + + /* Name of this edac device */ + snprintf(dev_ctl->name, sizeof(dev_ctl->name),"%s", dev_name); + + /* Initialize every Instance */ + for (instance = 0; instance < nr_instances; instance++) { + inst = &dev_inst[instance]; + inst->ctl = dev_ctl; + inst->nr_blocks = nr_blocks; + blk_p = &dev_blk[instance * nr_blocks]; + inst->blocks = blk_p; + + /* name of this instance */ + snprintf(inst->name, sizeof(inst->name), "%s%u", dev_name, instance); + + /* Initialize every block in each instance */ + for (block = 0; block < nr_blocks; block++) { + blk = &blk_p[block]; + blk->instance = inst; + snprintf(blk->name, sizeof(blk->name), + "%s%d", blk_name, block + off_val); + + edac_dbg(4, "instance=%d inst_p=%p block=#%d block_p=%p name='%s'\n", + instance, inst, block, blk, blk->name); + + /* if there are NO attributes OR no attribute pointer + * then continue on to next block iteration + */ + if ((nr_attrib == 0) || (attrib_spec == NULL)) + continue; + + /* setup the attribute array for this block */ + blk->nr_attribs = nr_attrib; + attrib_p = &dev_attrib[block*nr_instances*nr_attrib]; + blk->block_attributes = attrib_p; + + edac_dbg(4, "THIS BLOCK_ATTRIB=%p\n", + blk->block_attributes); + + /* Initialize every user specified attribute in this + * block with the data the caller passed in + * Each block gets its own copy of pointers, + * and its unique 'value' + */ + for (attr = 0; attr < nr_attrib; attr++) { + attrib = &attrib_p[attr]; + + /* populate the unique per attrib + * with the code pointers and info + */ + attrib->attr = attrib_spec[attr].attr; + attrib->show = attrib_spec[attr].show; + attrib->store = attrib_spec[attr].store; + + attrib->block = blk; /* up link */ + + edac_dbg(4, "alloc-attrib=%p attrib_name='%s' attrib-spec=%p spec-name=%s\n", + attrib, attrib->attr.name, + &attrib_spec[attr], + attrib_spec[attr].attr.name + ); + } + } + } + + /* Mark this instance as merely ALLOCATED */ + dev_ctl->op_state = OP_ALLOC; + + /* + * Initialize the 'root' kobj for the edac_device controller + */ + err = edac_device_register_sysfs_main_kobj(dev_ctl); + if (err) + goto free; + + /* at this point, the root kobj is valid, and in order to + * 'free' the object, then the function: + * edac_device_unregister_sysfs_main_kobj() must be called + * which will perform kobj unregistration and the actual free + * will occur during the kobject callback operation + */ + + return dev_ctl; + +free: + __edac_device_free_ctl_info(dev_ctl); + + return NULL; +} +EXPORT_SYMBOL_GPL(edac_device_alloc_ctl_info); + +void edac_device_free_ctl_info(struct edac_device_ctl_info *ctl_info) +{ + edac_device_unregister_sysfs_main_kobj(ctl_info); +} +EXPORT_SYMBOL_GPL(edac_device_free_ctl_info); + +/* + * find_edac_device_by_dev + * scans the edac_device list for a specific 'struct device *' + * + * lock to be held prior to call: device_ctls_mutex + * + * Return: + * pointer to control structure managing 'dev' + * NULL if not found on list + */ +static struct edac_device_ctl_info *find_edac_device_by_dev(struct device *dev) +{ + struct edac_device_ctl_info *edac_dev; + struct list_head *item; + + edac_dbg(0, "\n"); + + list_for_each(item, &edac_device_list) { + edac_dev = list_entry(item, struct edac_device_ctl_info, link); + + if (edac_dev->dev == dev) + return edac_dev; + } + + return NULL; +} + +/* + * add_edac_dev_to_global_list + * Before calling this function, caller must + * assign a unique value to edac_dev->dev_idx. + * + * lock to be held prior to call: device_ctls_mutex + * + * Return: + * 0 on success + * 1 on failure. + */ +static int add_edac_dev_to_global_list(struct edac_device_ctl_info *edac_dev) +{ + struct list_head *item, *insert_before; + struct edac_device_ctl_info *rover; + + insert_before = &edac_device_list; + + /* Determine if already on the list */ + rover = find_edac_device_by_dev(edac_dev->dev); + if (unlikely(rover != NULL)) + goto fail0; + + /* Insert in ascending order by 'dev_idx', so find position */ + list_for_each(item, &edac_device_list) { + rover = list_entry(item, struct edac_device_ctl_info, link); + + if (rover->dev_idx >= edac_dev->dev_idx) { + if (unlikely(rover->dev_idx == edac_dev->dev_idx)) + goto fail1; + + insert_before = item; + break; + } + } + + list_add_tail_rcu(&edac_dev->link, insert_before); + return 0; + +fail0: + edac_printk(KERN_WARNING, EDAC_MC, + "%s (%s) %s %s already assigned %d\n", + dev_name(rover->dev), edac_dev_name(rover), + rover->mod_name, rover->ctl_name, rover->dev_idx); + return 1; + +fail1: + edac_printk(KERN_WARNING, EDAC_MC, + "bug in low-level driver: attempt to assign\n" + " duplicate dev_idx %d in %s()\n", rover->dev_idx, + __func__); + return 1; +} + +/* + * del_edac_device_from_global_list + */ +static void del_edac_device_from_global_list(struct edac_device_ctl_info + *edac_device) +{ + list_del_rcu(&edac_device->link); + + /* these are for safe removal of devices from global list while + * NMI handlers may be traversing list + */ + synchronize_rcu(); + INIT_LIST_HEAD(&edac_device->link); +} + +/* + * 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) +{ + struct delayed_work *d_work = to_delayed_work(work_req); + struct edac_device_ctl_info *edac_dev = to_edac_device_ctl_work(d_work); + + mutex_lock(&device_ctls_mutex); + + /* If we are being removed, bail out immediately */ + if (edac_dev->op_state == OP_OFFLINE) { + mutex_unlock(&device_ctls_mutex); + return; + } + + /* Only poll controllers that are running polled and have a check */ + if ((edac_dev->op_state == OP_RUNNING_POLL) && + (edac_dev->edac_check != NULL)) { + edac_dev->edac_check(edac_dev); + } + + mutex_unlock(&device_ctls_mutex); + + /* 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 firing all over the period + * between integral seconds + */ + if (edac_dev->poll_msec == DEFAULT_POLL_INTERVAL) + edac_queue_work(&edac_dev->work, round_jiffies_relative(edac_dev->delay)); + else + edac_queue_work(&edac_dev->work, edac_dev->delay); +} + +/* + * edac_device_workq_setup + * initialize a workq item for this edac_device instance + * passing in the new delay period in msec + */ +static void edac_device_workq_setup(struct edac_device_ctl_info *edac_dev, + unsigned msec) +{ + edac_dbg(0, "\n"); + + /* 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); + + INIT_DELAYED_WORK(&edac_dev->work, edac_device_workq_function); + + /* 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 == DEFAULT_POLL_INTERVAL) + edac_queue_work(&edac_dev->work, round_jiffies_relative(edac_dev->delay)); + else + edac_queue_work(&edac_dev->work, edac_dev->delay); +} + +/* + * edac_device_workq_teardown + * stop the workq processing on this edac_dev + */ +static void edac_device_workq_teardown(struct edac_device_ctl_info *edac_dev) +{ + if (!edac_dev->edac_check) + return; + + edac_dev->op_state = OP_OFFLINE; + + edac_stop_work(&edac_dev->work); +} + +/* + * 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 msec) +{ + edac_dev->poll_msec = msec; + edac_dev->delay = msecs_to_jiffies(msec); + + /* See comment in edac_device_workq_setup() above */ + if (edac_dev->poll_msec == DEFAULT_POLL_INTERVAL) + edac_mod_work(&edac_dev->work, round_jiffies_relative(edac_dev->delay)); + else + edac_mod_work(&edac_dev->work, edac_dev->delay); +} + +int edac_device_alloc_index(void) +{ + static atomic_t device_indexes = ATOMIC_INIT(0); + + return atomic_inc_return(&device_indexes) - 1; +} +EXPORT_SYMBOL_GPL(edac_device_alloc_index); + +int edac_device_add_device(struct edac_device_ctl_info *edac_dev) +{ + edac_dbg(0, "\n"); + +#ifdef CONFIG_EDAC_DEBUG + if (edac_debug_level >= 3) + edac_device_dump_device(edac_dev); +#endif + mutex_lock(&device_ctls_mutex); + + if (add_edac_dev_to_global_list(edac_dev)) + goto fail0; + + /* set load time so that error rate can be tracked */ + edac_dev->start_time = jiffies; + + /* create this instance's sysfs entries */ + if (edac_device_create_sysfs(edac_dev)) { + edac_device_printk(edac_dev, KERN_WARNING, + "failed to create sysfs device\n"); + goto fail1; + } + + /* If there IS a check routine, then we are running POLLED */ + if (edac_dev->edac_check != NULL) { + /* This instance is NOW RUNNING */ + edac_dev->op_state = OP_RUNNING_POLL; + + edac_device_workq_setup(edac_dev, edac_dev->poll_msec ?: DEFAULT_POLL_INTERVAL); + } else { + edac_dev->op_state = OP_RUNNING_INTERRUPT; + } + + /* Report action taken */ + edac_device_printk(edac_dev, KERN_INFO, + "Giving out device to module %s controller %s: DEV %s (%s)\n", + edac_dev->mod_name, edac_dev->ctl_name, edac_dev->dev_name, + edac_op_state_to_string(edac_dev->op_state)); + + mutex_unlock(&device_ctls_mutex); + return 0; + +fail1: + /* Some error, so remove the entry from the lsit */ + del_edac_device_from_global_list(edac_dev); + +fail0: + mutex_unlock(&device_ctls_mutex); + return 1; +} +EXPORT_SYMBOL_GPL(edac_device_add_device); + +struct edac_device_ctl_info *edac_device_del_device(struct device *dev) +{ + struct edac_device_ctl_info *edac_dev; + + edac_dbg(0, "\n"); + + mutex_lock(&device_ctls_mutex); + + /* Find the structure on the list, if not there, then leave */ + edac_dev = find_edac_device_by_dev(dev); + if (edac_dev == NULL) { + mutex_unlock(&device_ctls_mutex); + return NULL; + } + + /* mark this instance as OFFLINE */ + edac_dev->op_state = OP_OFFLINE; + + /* deregister from global list */ + del_edac_device_from_global_list(edac_dev); + + mutex_unlock(&device_ctls_mutex); + + /* clear workq processing on this instance */ + edac_device_workq_teardown(edac_dev); + + /* Tear down the sysfs entries for this instance */ + edac_device_remove_sysfs(edac_dev); + + edac_printk(KERN_INFO, EDAC_MC, + "Removed device %d for %s %s: DEV %s\n", + edac_dev->dev_idx, + edac_dev->mod_name, edac_dev->ctl_name, edac_dev_name(edac_dev)); + + return edac_dev; +} +EXPORT_SYMBOL_GPL(edac_device_del_device); + +static inline int edac_device_get_log_ce(struct edac_device_ctl_info *edac_dev) +{ + return edac_dev->log_ce; +} + +static inline int edac_device_get_log_ue(struct edac_device_ctl_info *edac_dev) +{ + return edac_dev->log_ue; +} + +static inline int edac_device_get_panic_on_ue(struct edac_device_ctl_info + *edac_dev) +{ + return edac_dev->panic_on_ue; +} + +void edac_device_handle_ce_count(struct edac_device_ctl_info *edac_dev, + unsigned int count, int inst_nr, int block_nr, + const char *msg) +{ + struct edac_device_instance *instance; + struct edac_device_block *block = NULL; + + if (!count) + return; + + if ((inst_nr >= edac_dev->nr_instances) || (inst_nr < 0)) { + edac_device_printk(edac_dev, KERN_ERR, + "INTERNAL ERROR: 'instance' out of range " + "(%d >= %d)\n", inst_nr, + edac_dev->nr_instances); + return; + } + + instance = edac_dev->instances + inst_nr; + + if ((block_nr >= instance->nr_blocks) || (block_nr < 0)) { + edac_device_printk(edac_dev, KERN_ERR, + "INTERNAL ERROR: instance %d 'block' " + "out of range (%d >= %d)\n", + inst_nr, block_nr, + instance->nr_blocks); + return; + } + + if (instance->nr_blocks > 0) { + block = instance->blocks + block_nr; + block->counters.ce_count += count; + } + + /* Propagate the count up the 'totals' tree */ + instance->counters.ce_count += count; + edac_dev->counters.ce_count += count; + + if (edac_device_get_log_ce(edac_dev)) + edac_device_printk(edac_dev, KERN_WARNING, + "CE: %s instance: %s block: %s count: %d '%s'\n", + edac_dev->ctl_name, instance->name, + block ? block->name : "N/A", count, msg); +} +EXPORT_SYMBOL_GPL(edac_device_handle_ce_count); + +void edac_device_handle_ue_count(struct edac_device_ctl_info *edac_dev, + unsigned int count, int inst_nr, int block_nr, + const char *msg) +{ + struct edac_device_instance *instance; + struct edac_device_block *block = NULL; + + if (!count) + return; + + if ((inst_nr >= edac_dev->nr_instances) || (inst_nr < 0)) { + edac_device_printk(edac_dev, KERN_ERR, + "INTERNAL ERROR: 'instance' out of range " + "(%d >= %d)\n", inst_nr, + edac_dev->nr_instances); + return; + } + + instance = edac_dev->instances + inst_nr; + + if ((block_nr >= instance->nr_blocks) || (block_nr < 0)) { + edac_device_printk(edac_dev, KERN_ERR, + "INTERNAL ERROR: instance %d 'block' " + "out of range (%d >= %d)\n", + inst_nr, block_nr, + instance->nr_blocks); + return; + } + + if (instance->nr_blocks > 0) { + block = instance->blocks + block_nr; + block->counters.ue_count += count; + } + + /* Propagate the count up the 'totals' tree */ + instance->counters.ue_count += count; + edac_dev->counters.ue_count += count; + + if (edac_device_get_log_ue(edac_dev)) + edac_device_printk(edac_dev, KERN_EMERG, + "UE: %s instance: %s block: %s count: %d '%s'\n", + edac_dev->ctl_name, instance->name, + block ? block->name : "N/A", count, msg); + + if (edac_device_get_panic_on_ue(edac_dev)) + panic("EDAC %s: UE instance: %s block %s count: %d '%s'\n", + edac_dev->ctl_name, instance->name, + block ? block->name : "N/A", count, msg); +} +EXPORT_SYMBOL_GPL(edac_device_handle_ue_count); |