/* * file for managing the edac_device subsystem of devices for EDAC * * (C) 2007 SoftwareBitMaker * * This file may be distributed under the terms of the * GNU General Public License. * * Written Doug Thompson <norsk5@xmission.com> *
*/
/* get the value and enforce that it is non-zero, must be at least * one millisecond for the delay period, between scans * Then cancel last outstanding delay for the work request * and set a new one.
*/
value = simple_strtoul(data, NULL, 0);
edac_device_reset_delay_period(ctl_info, value);
/* Declare the various ctl_info attributes here and their respective ops */
CTL_INFO_ATTR(log_ue, S_IRUGO | S_IWUSR,
edac_device_ctl_log_ue_show, edac_device_ctl_log_ue_store);
CTL_INFO_ATTR(log_ce, S_IRUGO | S_IWUSR,
edac_device_ctl_log_ce_show, edac_device_ctl_log_ce_store);
CTL_INFO_ATTR(panic_on_ue, S_IRUGO | S_IWUSR,
edac_device_ctl_panic_on_ue_show,
edac_device_ctl_panic_on_ue_store);
CTL_INFO_ATTR(poll_msec, S_IRUGO | S_IWUSR,
edac_device_ctl_poll_msec_show, edac_device_ctl_poll_msec_store);
/* Base Attributes of the EDAC_DEVICE ECC object */ staticstruct attribute *device_ctrl_attrs[] = {
&attr_ctl_info_panic_on_ue.attr,
&attr_ctl_info_log_ue.attr,
&attr_ctl_info_log_ce.attr,
&attr_ctl_info_poll_msec.attr,
NULL,
};
ATTRIBUTE_GROUPS(device_ctrl);
/* * edac_device_ctrl_master_release * * called when the reference count for the 'main' kobj * for a edac_device control struct reaches zero * * Reference count model: * One 'main' kobject for each control structure allocated. * That main kobj is initially set to one AND * the reference count for the EDAC 'core' module is * bumped by one, thus added 'keep in memory' dependency. * * Each new internal kobj (in instances and blocks) then * bumps the 'main' kobject. * * When they are released their release functions decrement * the 'main' kobj. * * When the main kobj reaches zero (0) then THIS function * is called which then decrements the EDAC 'core' module. * When the module reference count reaches zero then the * module no longer has dependency on keeping the release * function code in memory and module can be unloaded. * * This will support several control objects as well, each * with its own 'main' kobj.
*/ staticvoid edac_device_ctrl_master_release(struct kobject *kobj)
{ struct edac_device_ctl_info *edac_dev = to_edacdev(kobj);
/* * edac_device_unregister_sysfs_main_kobj: * the '..../edac/<name>' kobject
*/ void edac_device_unregister_sysfs_main_kobj(struct edac_device_ctl_info *dev)
{
edac_dbg(0, "\n");
edac_dbg(4, "name of kobject is: %s\n", kobject_name(&dev->kobj));
/* * Unregister the edac device's kobject and * allow for reference count to reach 0 at which point * the callback will be called to: * a) module_put() this module * b) 'kfree' the memory
*/
kobject_put(&dev->kobj);
}
/* edac_dev -> instance information */
/* * Set of low-level instance attribute show functions
*/ static ssize_t instance_ue_count_show(struct edac_device_instance *instance, char *data)
{ return sprintf(data, "%u\n", instance->counters.ue_count);
}
/* map from this kobj to the main control struct * and then dec the main kobj count
*/
instance = to_instance(kobj);
kobject_put(&instance->ctl->kobj);
}
/* * Define attributes visible for the edac_device instance object * Each contains a pointer to a show and an optional set * function pointer that does the low level output/input
*/
INSTANCE_ATTR(ce_count, S_IRUGO, instance_ce_count_show, NULL);
INSTANCE_ATTR(ue_count, S_IRUGO, instance_ue_count_show, NULL);
/* list of edac_dev 'instance' attributes */ staticstruct attribute *device_instance_attrs[] = {
&attr_instance_ce_count.attr,
&attr_instance_ue_count.attr,
NULL,
};
ATTRIBUTE_GROUPS(device_instance);
/* The 'ktype' for each edac_dev 'instance' */ staticstruct kobj_type ktype_instance_ctrl = {
.release = edac_device_ctrl_instance_release,
.sysfs_ops = &device_instance_ops,
.default_groups = device_instance_groups,
};
/* init this block's kobject */
memset(&block->kobj, 0, sizeof(struct kobject));
/* bump the main kobject's reference count for this controller * and this instance is dependent on the main
*/
main_kobj = kobject_get(&edac_dev->kobj); if (!main_kobj) {
err = -ENODEV; goto err_out;
}
/* Add this block's kobject */
err = kobject_init_and_add(&block->kobj, &ktype_block_ctrl,
&instance->kobj, "%s", block->name); if (err) {
edac_dbg(1, "Failed to register instance '%s'\n", block->name);
kobject_put(main_kobj);
err = -ENODEV; goto err_out;
}
/* If there are driver level block attributes, then added them * to the block kobject
*/
sysfs_attrib = block->block_attributes; if (sysfs_attrib && block->nr_attribs) { for (i = 0; i < block->nr_attribs; i++, sysfs_attrib++) {
edac_dbg(4, "creating block attrib='%s' attrib->%p to kobj=%p\n",
sysfs_attrib->attr.name,
sysfs_attrib, &block->kobj);
/* Create each block_attribute file */
err = sysfs_create_file(&block->kobj,
&sysfs_attrib->attr); if (err) goto err_on_attrib;
}
}
kobject_uevent(&block->kobj, KOBJ_ADD);
/* if this block has 'attributes' then we need to iterate over the list * and 'remove' the attributes on this block
*/
sysfs_attrib = block->block_attributes; if (sysfs_attrib && block->nr_attribs) { for (i = 0; i < block->nr_attribs; i++, sysfs_attrib++) {
/* * edac_device_create_instance * create just one instance of an edac_device 'instance'
*/ staticint edac_device_create_instance(struct edac_device_ctl_info *edac_dev, int idx)
{ int i, j; int err; struct edac_device_instance *instance; struct kobject *main_kobj;
instance = &edac_dev->instances[idx];
/* Init the instance's kobject */
memset(&instance->kobj, 0, sizeof(struct kobject));
instance->ctl = edac_dev;
/* bump the main kobject's reference count for this controller * and this instance is dependent on the main
*/
main_kobj = kobject_get(&edac_dev->kobj); if (!main_kobj) {
err = -ENODEV; goto err_out;
}
/* Formally register this instance's kobject under the edac_device */
err = kobject_init_and_add(&instance->kobj, &ktype_instance_ctrl,
&edac_dev->kobj, "%s", instance->name); if (err != 0) {
edac_dbg(2, "Failed to register instance '%s'\n",
instance->name);
kobject_put(main_kobj); goto err_out;
}
edac_dbg(4, "now register '%d' blocks for instance %d\n",
instance->nr_blocks, idx);
/* register all blocks of this instance */ for (i = 0; i < instance->nr_blocks; i++) {
err = edac_device_create_block(edac_dev, instance,
&instance->blocks[i]); if (err) { /* If any fail, remove all previous ones */ for (j = 0; j < i; j++)
edac_device_delete_block(edac_dev,
&instance->blocks[j]); goto err_release_instance_kobj;
}
}
kobject_uevent(&instance->kobj, KOBJ_ADD);
/* * edac_device_remove_instance * remove an edac_device instance
*/ staticvoid edac_device_delete_instance(struct edac_device_ctl_info *edac_dev, int idx)
{ struct edac_device_instance *instance; int i;
instance = &edac_dev->instances[idx];
/* unregister all blocks in this instance */ for (i = 0; i < instance->nr_blocks; i++)
edac_device_delete_block(edac_dev, &instance->blocks[i]);
/* unregister this instance's kobject, SEE: * edac_device_ctrl_instance_release() for callback operation
*/
kobject_put(&instance->kobj);
}
/* * edac_device_create_instances * create the first level of 'instances' for this device * (ie 'cache' might have 'cache0', 'cache1', 'cache2', etc
*/ staticint edac_device_create_instances(struct edac_device_ctl_info *edac_dev)
{ int i, j; int err;
edac_dbg(0, "\n");
/* iterate over creation of the instances */ for (i = 0; i < edac_dev->nr_instances; i++) {
err = edac_device_create_instance(edac_dev, i); if (err) { /* unwind previous instances on error */ for (j = 0; j < i; j++)
edac_device_delete_instance(edac_dev, j); return err;
}
}
return 0;
}
/* * edac_device_delete_instances(edac_dev); * unregister all the kobjects of the instances
*/ staticvoid edac_device_delete_instances(struct edac_device_ctl_info *edac_dev)
{ int i;
/* iterate over creation of the instances */ for (i = 0; i < edac_dev->nr_instances; i++)
edac_device_delete_instance(edac_dev, i);
}
/* edac_dev sysfs ctor/dtor code */
/* * edac_device_add_main_sysfs_attributes * add some attributes to this instance's main kobject
*/ staticint edac_device_add_main_sysfs_attributes( struct edac_device_ctl_info *edac_dev)
{ struct edac_dev_sysfs_attribute *sysfs_attrib; int err = 0;
sysfs_attrib = edac_dev->sysfs_attributes; if (sysfs_attrib) { /* iterate over the array and create an attribute for each * entry in the list
*/ while (sysfs_attrib->attr.name != NULL) {
err = sysfs_create_file(&edac_dev->kobj,
(struct attribute*) sysfs_attrib); if (err) goto err_out;
sysfs_attrib++;
}
}
err_out: return err;
}
/* * edac_device_remove_main_sysfs_attributes * remove any attributes to this instance's main kobject
*/ staticvoid edac_device_remove_main_sysfs_attributes( struct edac_device_ctl_info *edac_dev)
{ struct edac_dev_sysfs_attribute *sysfs_attrib;
/* if there are main attributes, defined, remove them. First, * point to the start of the array and iterate over it * removing each attribute listed from this device's instance's kobject
*/
sysfs_attrib = edac_dev->sysfs_attributes; if (sysfs_attrib) { while (sysfs_attrib->attr.name != NULL) {
sysfs_remove_file(&edac_dev->kobj,
(struct attribute *) sysfs_attrib);
sysfs_attrib++;
}
}
}
/* * edac_device_create_sysfs() Constructor * * accept a created edac_device control structure * and 'export' it to sysfs. The 'main' kobj should already have been * created. 'instance' and 'block' kobjects should be registered * along with any 'block' attributes from the low driver. In addition, * the main attributes (if any) are connected to the main kobject of * the control structure. * * Return: * 0 Success * !0 Failure
*/ int edac_device_create_sysfs(struct edac_device_ctl_info *edac_dev)
{ int err; struct kobject *edac_kobj = &edac_dev->kobj;
edac_dbg(0, "idx=%d\n", edac_dev->dev_idx);
/* go create any main attributes callers wants */
err = edac_device_add_main_sysfs_attributes(edac_dev); if (err) {
edac_dbg(0, "failed to add sysfs attribs\n"); goto err_out;
}
/* create a symlink from the edac device * to the platform 'device' being used for this
*/
err = sysfs_create_link(edac_kobj,
&edac_dev->dev->kobj, EDAC_DEVICE_SYMLINK); if (err) {
edac_dbg(0, "sysfs_create_link() returned err= %d\n", err); goto err_remove_main_attribs;
}
/* Create the first level instance directories * In turn, the nested blocks beneath the instances will * be registered as well
*/
err = edac_device_create_instances(edac_dev); if (err) {
edac_dbg(0, "edac_device_create_instances() returned err= %d\n",
err); goto err_remove_link;
}
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