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653 lines
18 KiB
653 lines
18 KiB
|
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/* |
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* edac_device.c |
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* (C) 2007 www.douglaskthompson.com |
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* |
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* This file may be distributed under the terms of the |
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* GNU General Public License. |
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* |
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* Written by Doug Thompson <[email protected]> |
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* |
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* edac_device API implementation |
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* 19 Jan 2007 |
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*/ |
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|
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#include <asm/page.h> |
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#include <linux/uaccess.h> |
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#include <linux/ctype.h> |
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#include <linux/highmem.h> |
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#include <linux/init.h> |
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#include <linux/jiffies.h> |
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#include <linux/module.h> |
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#include <linux/slab.h> |
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#include <linux/smp.h> |
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#include <linux/spinlock.h> |
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#include <linux/sysctl.h> |
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#include <linux/timer.h> |
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|
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#include "edac_device.h" |
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#include "edac_module.h" |
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|
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/* lock for the list: 'edac_device_list', manipulation of this list |
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* is protected by the 'device_ctls_mutex' lock |
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*/ |
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static DEFINE_MUTEX(device_ctls_mutex); |
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static LIST_HEAD(edac_device_list); |
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|
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#ifdef CONFIG_EDAC_DEBUG |
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static void edac_device_dump_device(struct edac_device_ctl_info *edac_dev) |
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{ |
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edac_dbg(3, "\tedac_dev = %p dev_idx=%d\n", |
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edac_dev, edac_dev->dev_idx); |
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edac_dbg(4, "\tedac_dev->edac_check = %p\n", edac_dev->edac_check); |
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edac_dbg(3, "\tdev = %p\n", edac_dev->dev); |
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edac_dbg(3, "\tmod_name:ctl_name = %s:%s\n", |
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edac_dev->mod_name, edac_dev->ctl_name); |
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edac_dbg(3, "\tpvt_info = %p\n\n", edac_dev->pvt_info); |
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} |
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#endif /* CONFIG_EDAC_DEBUG */ |
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|
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struct edac_device_ctl_info *edac_device_alloc_ctl_info( |
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unsigned sz_private, |
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char *edac_device_name, unsigned nr_instances, |
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char *edac_block_name, unsigned nr_blocks, |
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unsigned offset_value, /* zero, 1, or other based offset */ |
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struct edac_dev_sysfs_block_attribute *attrib_spec, unsigned nr_attrib, |
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int device_index) |
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{ |
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struct edac_device_ctl_info *dev_ctl; |
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struct edac_device_instance *dev_inst, *inst; |
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struct edac_device_block *dev_blk, *blk_p, *blk; |
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struct edac_dev_sysfs_block_attribute *dev_attrib, *attrib_p, *attrib; |
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unsigned total_size; |
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unsigned count; |
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unsigned instance, block, attr; |
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void *pvt, *p; |
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int err; |
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|
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edac_dbg(4, "instances=%d blocks=%d\n", nr_instances, nr_blocks); |
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|
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/* Calculate the size of memory we need to allocate AND |
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* determine the offsets of the various item arrays |
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* (instance,block,attrib) from the start of an allocated structure. |
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* We want the alignment of each item (instance,block,attrib) |
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* to be at least as stringent as what the compiler would |
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* provide if we could simply hardcode everything into a single struct. |
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*/ |
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p = NULL; |
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dev_ctl = edac_align_ptr(&p, sizeof(*dev_ctl), 1); |
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|
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/* Calc the 'end' offset past end of ONE ctl_info structure |
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* which will become the start of the 'instance' array |
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*/ |
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dev_inst = edac_align_ptr(&p, sizeof(*dev_inst), nr_instances); |
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|
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/* Calc the 'end' offset past the instance array within the ctl_info |
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* which will become the start of the block array |
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*/ |
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count = nr_instances * nr_blocks; |
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dev_blk = edac_align_ptr(&p, sizeof(*dev_blk), count); |
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|
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/* Calc the 'end' offset past the dev_blk array |
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* which will become the start of the attrib array, if any. |
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*/ |
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/* calc how many nr_attrib we need */ |
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if (nr_attrib > 0) |
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count *= nr_attrib; |
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dev_attrib = edac_align_ptr(&p, sizeof(*dev_attrib), count); |
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|
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/* Calc the 'end' offset past the attributes array */ |
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pvt = edac_align_ptr(&p, sz_private, 1); |
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|
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/* 'pvt' now points to where the private data area is. |
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* At this point 'pvt' (like dev_inst,dev_blk and dev_attrib) |
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* is baselined at ZERO |
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*/ |
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total_size = ((unsigned long)pvt) + sz_private; |
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|
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/* Allocate the amount of memory for the set of control structures */ |
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dev_ctl = kzalloc(total_size, GFP_KERNEL); |
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if (dev_ctl == NULL) |
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return NULL; |
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|
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/* Adjust pointers so they point within the actual memory we |
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* just allocated rather than an imaginary chunk of memory |
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* located at address 0. |
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* 'dev_ctl' points to REAL memory, while the others are |
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* ZERO based and thus need to be adjusted to point within |
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* the allocated memory. |
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*/ |
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dev_inst = (struct edac_device_instance *) |
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(((char *)dev_ctl) + ((unsigned long)dev_inst)); |
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dev_blk = (struct edac_device_block *) |
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(((char *)dev_ctl) + ((unsigned long)dev_blk)); |
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dev_attrib = (struct edac_dev_sysfs_block_attribute *) |
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(((char *)dev_ctl) + ((unsigned long)dev_attrib)); |
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pvt = sz_private ? (((char *)dev_ctl) + ((unsigned long)pvt)) : NULL; |
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|
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/* Begin storing the information into the control info structure */ |
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dev_ctl->dev_idx = device_index; |
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dev_ctl->nr_instances = nr_instances; |
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dev_ctl->instances = dev_inst; |
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dev_ctl->pvt_info = pvt; |
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|
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/* Default logging of CEs and UEs */ |
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dev_ctl->log_ce = 1; |
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dev_ctl->log_ue = 1; |
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|
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/* Name of this edac device */ |
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snprintf(dev_ctl->name,sizeof(dev_ctl->name),"%s",edac_device_name); |
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|
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edac_dbg(4, "edac_dev=%p next after end=%p\n", |
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dev_ctl, pvt + sz_private); |
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|
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/* Initialize every Instance */ |
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for (instance = 0; instance < nr_instances; instance++) { |
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inst = &dev_inst[instance]; |
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inst->ctl = dev_ctl; |
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inst->nr_blocks = nr_blocks; |
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blk_p = &dev_blk[instance * nr_blocks]; |
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inst->blocks = blk_p; |
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|
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/* name of this instance */ |
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snprintf(inst->name, sizeof(inst->name), |
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"%s%u", edac_device_name, instance); |
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|
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/* Initialize every block in each instance */ |
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for (block = 0; block < nr_blocks; block++) { |
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blk = &blk_p[block]; |
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blk->instance = inst; |
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snprintf(blk->name, sizeof(blk->name), |
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"%s%d", edac_block_name, block+offset_value); |
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|
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edac_dbg(4, "instance=%d inst_p=%p block=#%d block_p=%p name='%s'\n", |
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instance, inst, block, blk, blk->name); |
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|
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/* if there are NO attributes OR no attribute pointer |
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* then continue on to next block iteration |
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*/ |
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if ((nr_attrib == 0) || (attrib_spec == NULL)) |
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continue; |
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|
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/* setup the attribute array for this block */ |
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blk->nr_attribs = nr_attrib; |
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attrib_p = &dev_attrib[block*nr_instances*nr_attrib]; |
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blk->block_attributes = attrib_p; |
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|
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edac_dbg(4, "THIS BLOCK_ATTRIB=%p\n", |
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blk->block_attributes); |
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|
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/* Initialize every user specified attribute in this |
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* block with the data the caller passed in |
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* Each block gets its own copy of pointers, |
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* and its unique 'value' |
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*/ |
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for (attr = 0; attr < nr_attrib; attr++) { |
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attrib = &attrib_p[attr]; |
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|
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/* populate the unique per attrib |
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* with the code pointers and info |
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*/ |
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attrib->attr = attrib_spec[attr].attr; |
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attrib->show = attrib_spec[attr].show; |
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attrib->store = attrib_spec[attr].store; |
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attrib->block = blk; /* up link */ |
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edac_dbg(4, "alloc-attrib=%p attrib_name='%s' attrib-spec=%p spec-name=%s\n", |
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attrib, attrib->attr.name, |
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&attrib_spec[attr], |
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attrib_spec[attr].attr.name |
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); |
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} |
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} |
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} |
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|
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/* Mark this instance as merely ALLOCATED */ |
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dev_ctl->op_state = OP_ALLOC; |
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|
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/* |
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* Initialize the 'root' kobj for the edac_device controller |
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*/ |
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err = edac_device_register_sysfs_main_kobj(dev_ctl); |
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if (err) { |
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kfree(dev_ctl); |
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return NULL; |
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} |
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|
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/* at this point, the root kobj is valid, and in order to |
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* 'free' the object, then the function: |
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* edac_device_unregister_sysfs_main_kobj() must be called |
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* which will perform kobj unregistration and the actual free |
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* will occur during the kobject callback operation |
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*/ |
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|
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return dev_ctl; |
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} |
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EXPORT_SYMBOL_GPL(edac_device_alloc_ctl_info); |
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|
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void edac_device_free_ctl_info(struct edac_device_ctl_info *ctl_info) |
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{ |
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edac_device_unregister_sysfs_main_kobj(ctl_info); |
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} |
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EXPORT_SYMBOL_GPL(edac_device_free_ctl_info); |
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|
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/* |
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* find_edac_device_by_dev |
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* scans the edac_device list for a specific 'struct device *' |
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* |
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* lock to be held prior to call: device_ctls_mutex |
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* |
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* Return: |
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* pointer to control structure managing 'dev' |
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* NULL if not found on list |
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*/ |
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static struct edac_device_ctl_info *find_edac_device_by_dev(struct device *dev) |
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{ |
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struct edac_device_ctl_info *edac_dev; |
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struct list_head *item; |
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edac_dbg(0, "\n"); |
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list_for_each(item, &edac_device_list) { |
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edac_dev = list_entry(item, struct edac_device_ctl_info, link); |
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|
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if (edac_dev->dev == dev) |
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return edac_dev; |
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} |
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|
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return NULL; |
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} |
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|
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/* |
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* add_edac_dev_to_global_list |
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* Before calling this function, caller must |
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* assign a unique value to edac_dev->dev_idx. |
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* |
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* lock to be held prior to call: device_ctls_mutex |
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* |
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* Return: |
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* 0 on success |
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* 1 on failure. |
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*/ |
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static int add_edac_dev_to_global_list(struct edac_device_ctl_info *edac_dev) |
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{ |
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struct list_head *item, *insert_before; |
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struct edac_device_ctl_info *rover; |
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insert_before = &edac_device_list; |
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|
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/* Determine if already on the list */ |
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rover = find_edac_device_by_dev(edac_dev->dev); |
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if (unlikely(rover != NULL)) |
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goto fail0; |
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|
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/* Insert in ascending order by 'dev_idx', so find position */ |
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list_for_each(item, &edac_device_list) { |
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rover = list_entry(item, struct edac_device_ctl_info, link); |
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|
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if (rover->dev_idx >= edac_dev->dev_idx) { |
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if (unlikely(rover->dev_idx == edac_dev->dev_idx)) |
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goto fail1; |
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insert_before = item; |
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break; |
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} |
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} |
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list_add_tail_rcu(&edac_dev->link, insert_before); |
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return 0; |
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fail0: |
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edac_printk(KERN_WARNING, EDAC_MC, |
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"%s (%s) %s %s already assigned %d\n", |
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dev_name(rover->dev), edac_dev_name(rover), |
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rover->mod_name, rover->ctl_name, rover->dev_idx); |
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return 1; |
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fail1: |
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edac_printk(KERN_WARNING, EDAC_MC, |
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"bug in low-level driver: attempt to assign\n" |
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" duplicate dev_idx %d in %s()\n", rover->dev_idx, |
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__func__); |
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return 1; |
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} |
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|
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/* |
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* del_edac_device_from_global_list |
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*/ |
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static void del_edac_device_from_global_list(struct edac_device_ctl_info |
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*edac_device) |
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{ |
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list_del_rcu(&edac_device->link); |
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|
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/* these are for safe removal of devices from global list while |
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* NMI handlers may be traversing list |
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*/ |
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synchronize_rcu(); |
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INIT_LIST_HEAD(&edac_device->link); |
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} |
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|
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/* |
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* edac_device_workq_function |
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* performs the operation scheduled by a workq request |
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* |
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* this workq is embedded within an edac_device_ctl_info |
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* structure, that needs to be polled for possible error events. |
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* |
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* This operation is to acquire the list mutex lock |
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* (thus preventing insertation or deletion) |
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* and then call the device's poll function IFF this device is |
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* running polled and there is a poll function defined. |
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*/ |
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static void edac_device_workq_function(struct work_struct *work_req) |
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{ |
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struct delayed_work *d_work = to_delayed_work(work_req); |
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struct edac_device_ctl_info *edac_dev = to_edac_device_ctl_work(d_work); |
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mutex_lock(&device_ctls_mutex); |
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|
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/* If we are being removed, bail out immediately */ |
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if (edac_dev->op_state == OP_OFFLINE) { |
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mutex_unlock(&device_ctls_mutex); |
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return; |
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} |
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|
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/* Only poll controllers that are running polled and have a check */ |
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if ((edac_dev->op_state == OP_RUNNING_POLL) && |
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(edac_dev->edac_check != NULL)) { |
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edac_dev->edac_check(edac_dev); |
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} |
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|
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mutex_unlock(&device_ctls_mutex); |
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|
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/* Reschedule the workq for the next time period to start again |
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* if the number of msec is for 1 sec, then adjust to the next |
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* whole one second to save timers firing all over the period |
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* between integral seconds |
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*/ |
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if (edac_dev->poll_msec == 1000) |
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edac_queue_work(&edac_dev->work, round_jiffies_relative(edac_dev->delay)); |
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else |
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edac_queue_work(&edac_dev->work, edac_dev->delay); |
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} |
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|
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/* |
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* edac_device_workq_setup |
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* initialize a workq item for this edac_device instance |
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* passing in the new delay period in msec |
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*/ |
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static void edac_device_workq_setup(struct edac_device_ctl_info *edac_dev, |
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unsigned msec) |
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{ |
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edac_dbg(0, "\n"); |
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|
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/* take the arg 'msec' and set it into the control structure |
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* to used in the time period calculation |
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* then calc the number of jiffies that represents |
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*/ |
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edac_dev->poll_msec = msec; |
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edac_dev->delay = msecs_to_jiffies(msec); |
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|
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INIT_DELAYED_WORK(&edac_dev->work, edac_device_workq_function); |
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|
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/* optimize here for the 1 second case, which will be normal value, to |
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* fire ON the 1 second time event. This helps reduce all sorts of |
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* timers firing on sub-second basis, while they are happy |
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* to fire together on the 1 second exactly |
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*/ |
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if (edac_dev->poll_msec == 1000) |
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edac_queue_work(&edac_dev->work, round_jiffies_relative(edac_dev->delay)); |
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else |
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edac_queue_work(&edac_dev->work, edac_dev->delay); |
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} |
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|
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/* |
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* edac_device_workq_teardown |
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* stop the workq processing on this edac_dev |
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*/ |
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static void edac_device_workq_teardown(struct edac_device_ctl_info *edac_dev) |
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{ |
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if (!edac_dev->edac_check) |
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return; |
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|
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edac_dev->op_state = OP_OFFLINE; |
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edac_stop_work(&edac_dev->work); |
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} |
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|
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/* |
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* edac_device_reset_delay_period |
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* |
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* need to stop any outstanding workq queued up at this time |
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* because we will be resetting the sleep time. |
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* Then restart the workq on the new delay |
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*/ |
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void edac_device_reset_delay_period(struct edac_device_ctl_info *edac_dev, |
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unsigned long value) |
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{ |
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unsigned long jiffs = msecs_to_jiffies(value); |
|
|
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if (value == 1000) |
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jiffs = round_jiffies_relative(value); |
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edac_dev->poll_msec = value; |
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edac_dev->delay = jiffs; |
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|
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edac_mod_work(&edac_dev->work, jiffs); |
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} |
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|
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int edac_device_alloc_index(void) |
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{ |
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static atomic_t device_indexes = ATOMIC_INIT(0); |
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|
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return atomic_inc_return(&device_indexes) - 1; |
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} |
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EXPORT_SYMBOL_GPL(edac_device_alloc_index); |
|
|
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int edac_device_add_device(struct edac_device_ctl_info *edac_dev) |
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{ |
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edac_dbg(0, "\n"); |
|
|
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#ifdef CONFIG_EDAC_DEBUG |
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if (edac_debug_level >= 3) |
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edac_device_dump_device(edac_dev); |
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#endif |
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mutex_lock(&device_ctls_mutex); |
|
|
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if (add_edac_dev_to_global_list(edac_dev)) |
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goto fail0; |
|
|
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/* set load time so that error rate can be tracked */ |
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edac_dev->start_time = jiffies; |
|
|
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/* create this instance's sysfs entries */ |
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if (edac_device_create_sysfs(edac_dev)) { |
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edac_device_printk(edac_dev, KERN_WARNING, |
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"failed to create sysfs device\n"); |
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goto fail1; |
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} |
|
|
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/* If there IS a check routine, then we are running POLLED */ |
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if (edac_dev->edac_check != NULL) { |
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/* This instance is NOW RUNNING */ |
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edac_dev->op_state = OP_RUNNING_POLL; |
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|
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/* |
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* enable workq processing on this instance, |
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* default = 1000 msec |
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*/ |
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edac_device_workq_setup(edac_dev, 1000); |
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} else { |
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edac_dev->op_state = OP_RUNNING_INTERRUPT; |
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} |
|
|
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/* Report action taken */ |
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edac_device_printk(edac_dev, KERN_INFO, |
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"Giving out device to module %s controller %s: DEV %s (%s)\n", |
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edac_dev->mod_name, edac_dev->ctl_name, edac_dev->dev_name, |
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edac_op_state_to_string(edac_dev->op_state)); |
|
|
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mutex_unlock(&device_ctls_mutex); |
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return 0; |
|
|
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fail1: |
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/* Some error, so remove the entry from the lsit */ |
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del_edac_device_from_global_list(edac_dev); |
|
|
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fail0: |
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mutex_unlock(&device_ctls_mutex); |
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return 1; |
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} |
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EXPORT_SYMBOL_GPL(edac_device_add_device); |
|
|
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struct edac_device_ctl_info *edac_device_del_device(struct device *dev) |
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{ |
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struct edac_device_ctl_info *edac_dev; |
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|
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edac_dbg(0, "\n"); |
|
|
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mutex_lock(&device_ctls_mutex); |
|
|
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/* Find the structure on the list, if not there, then leave */ |
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edac_dev = find_edac_device_by_dev(dev); |
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if (edac_dev == NULL) { |
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mutex_unlock(&device_ctls_mutex); |
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return NULL; |
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} |
|
|
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/* mark this instance as OFFLINE */ |
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edac_dev->op_state = OP_OFFLINE; |
|
|
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/* deregister from global list */ |
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del_edac_device_from_global_list(edac_dev); |
|
|
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mutex_unlock(&device_ctls_mutex); |
|
|
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/* clear workq processing on this instance */ |
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edac_device_workq_teardown(edac_dev); |
|
|
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/* Tear down the sysfs entries for this instance */ |
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edac_device_remove_sysfs(edac_dev); |
|
|
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edac_printk(KERN_INFO, EDAC_MC, |
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"Removed device %d for %s %s: DEV %s\n", |
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edac_dev->dev_idx, |
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edac_dev->mod_name, edac_dev->ctl_name, edac_dev_name(edac_dev)); |
|
|
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return edac_dev; |
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} |
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EXPORT_SYMBOL_GPL(edac_device_del_device); |
|
|
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static inline int edac_device_get_log_ce(struct edac_device_ctl_info *edac_dev) |
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{ |
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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);
|
|
|