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![Borislav Petkov](/assets/img/avatar_default.png)
It is syntactic sugar anyway: # drivers/edac/edac_mc.o: text data bss dec hex filename 13378 324 8 13710 358e edac_mc.o.before 13378 324 8 13710 358e edac_mc.o.after md5: 70a53ee3ac7f867730e35c2be9110748 edac_mc.o.before.asm 70a53ee3ac7f867730e35c2be9110748 edac_mc.o.after.asm # drivers/edac/edac_device.o: text data bss dec hex filename 5704 120 4 5828 16c4 edac_device.o.before 5704 120 4 5828 16c4 edac_device.o.after md5: 880563c859da6eb9aca85ec431fdbaeb edac_device.o.before.asm 880563c859da6eb9aca85ec431fdbaeb edac_device.o.after.asm No functional changes. Reported-by: kernel test robot <lkp@intel.com> Signed-off-by: Borislav Petkov <bp@suse.de> Link: https://lore.kernel.org/r/20220412211957.28899-1-bp@alien8.de
623 lines
16 KiB
C
623 lines
16 KiB
C
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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 <norsk5@xmission.com>
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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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#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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#include "edac_device.h"
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#include "edac_module.h"
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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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#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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* @off_val: zero, 1, or other based offset
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*/
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struct edac_device_ctl_info *
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edac_device_alloc_ctl_info(unsigned pvt_sz, char *dev_name, unsigned nr_instances,
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char *blk_name, unsigned nr_blocks, unsigned off_val,
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struct edac_dev_sysfs_block_attribute *attrib_spec,
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unsigned nr_attrib, int device_index)
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{
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struct edac_dev_sysfs_block_attribute *dev_attrib, *attrib_p, *attrib;
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struct edac_device_block *dev_blk, *blk_p, *blk;
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struct edac_device_instance *dev_inst, *inst;
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struct edac_device_ctl_info *dev_ctl;
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unsigned instance, block, attr;
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void *pvt;
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int err;
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edac_dbg(4, "instances=%d blocks=%d\n", nr_instances, nr_blocks);
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dev_ctl = kzalloc(sizeof(struct edac_device_ctl_info), GFP_KERNEL);
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if (!dev_ctl)
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return NULL;
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dev_inst = kcalloc(nr_instances, sizeof(struct edac_device_instance), GFP_KERNEL);
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if (!dev_inst)
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goto free;
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dev_ctl->instances = dev_inst;
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dev_blk = kcalloc(nr_instances * nr_blocks, sizeof(struct edac_device_block), GFP_KERNEL);
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if (!dev_blk)
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goto free;
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dev_ctl->blocks = dev_blk;
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if (nr_attrib) {
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dev_attrib = kcalloc(nr_attrib, sizeof(struct edac_dev_sysfs_block_attribute),
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GFP_KERNEL);
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if (!dev_attrib)
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goto free;
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dev_ctl->attribs = dev_attrib;
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}
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if (pvt_sz) {
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pvt = kzalloc(pvt_sz, GFP_KERNEL);
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if (!pvt)
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goto free;
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dev_ctl->pvt_info = pvt;
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}
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dev_ctl->dev_idx = device_index;
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dev_ctl->nr_instances = nr_instances;
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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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/* Name of this edac device */
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snprintf(dev_ctl->name, sizeof(dev_ctl->name),"%s", dev_name);
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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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/* name of this instance */
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snprintf(inst->name, sizeof(inst->name), "%s%u", dev_name, instance);
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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", blk_name, block + off_val);
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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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/* 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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/* 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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edac_dbg(4, "THIS BLOCK_ATTRIB=%p\n",
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blk->block_attributes);
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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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/* 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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/* Mark this instance as merely ALLOCATED */
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dev_ctl->op_state = OP_ALLOC;
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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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goto free;
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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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return dev_ctl;
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free:
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__edac_device_free_ctl_info(dev_ctl);
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return NULL;
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}
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EXPORT_SYMBOL_GPL(edac_device_alloc_ctl_info);
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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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* 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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if (edac_dev->dev == dev)
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return edac_dev;
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}
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return NULL;
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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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/* 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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/* 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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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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* 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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/* 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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* 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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/* 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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/* 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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mutex_unlock(&device_ctls_mutex);
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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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* 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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/* 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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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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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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* 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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int edac_device_alloc_index(void)
|
|
{
|
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static atomic_t device_indexes = ATOMIC_INIT(0);
|
|
|
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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)
|
|
{
|
|
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))
|
|
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;
|
|
|
|
/*
|
|
* enable workq processing on this instance,
|
|
* default = 1000 msec
|
|
*/
|
|
edac_device_workq_setup(edac_dev, 1000);
|
|
} 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);
|