drivers/edac: updated PCI monitoring
Moving PCI to a per-instance device model This should include the correct sysfs setup as well. Please review. Signed-off-by: Dave Jiang <djiang@mvista.com> Signed-off-by: Douglas Thompson <dougthompson@xmission.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Dave Jiang
committed by
Linus Torvalds
Linus Torvalds
parent
81d87cb13e
commit
91b99041c1
451
drivers/edac/edac_pci.c
Normal file
451
drivers/edac/edac_pci.c
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@@ -0,0 +1,451 @@
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/*
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* EDAC PCI component
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*
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* Author: Dave Jiang <djiang@mvista.com>
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*
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* 2007 (c) MontaVista Software, Inc. This file is licensed under
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* the terms of the GNU General Public License version 2. This program
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* is licensed "as is" without any warranty of any kind, whether express
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* or implied.
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*
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*/
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/smp.h>
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#include <linux/init.h>
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#include <linux/sysctl.h>
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#include <linux/highmem.h>
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#include <linux/timer.h>
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#include <linux/slab.h>
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#include <linux/spinlock.h>
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#include <linux/list.h>
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#include <linux/sysdev.h>
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#include <linux/ctype.h>
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#include <linux/workqueue.h>
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#include <asm/uaccess.h>
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#include <asm/page.h>
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#include "edac_core.h"
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#include "edac_module.h"
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static DEFINE_MUTEX(edac_pci_ctls_mutex);
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static struct list_head edac_pci_list = LIST_HEAD_INIT(edac_pci_list);
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static inline void edac_lock_pci_list(void)
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{
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mutex_lock(&edac_pci_ctls_mutex);
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}
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static inline void edac_unlock_pci_list(void)
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{
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mutex_unlock(&edac_pci_ctls_mutex);
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}
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/*
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* The alloc() and free() functions for the 'edac_pci' control info
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* structure. The chip driver will allocate one of these for each
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* edac_pci it is going to control/register with the EDAC CORE.
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*/
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struct edac_pci_ctl_info * edac_pci_alloc_ctl_info(
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unsigned int sz_pvt,
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const char *edac_pci_name)
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{
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struct edac_pci_ctl_info *pci;
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void *pvt;
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unsigned int size;
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pci = (struct edac_pci_ctl_info *)0;
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pvt = edac_align_ptr(&pci[1], sz_pvt);
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size = ((unsigned long)pvt) + sz_pvt;
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if ((pci = kzalloc(size, GFP_KERNEL)) == NULL)
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return NULL;
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pvt = sz_pvt ? ((char *)pci) + ((unsigned long)pvt) : NULL;
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pci->pvt_info = pvt;
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pci->op_state = OP_ALLOC;
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snprintf(pci->name, strlen(edac_pci_name)+1, "%s", edac_pci_name);
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return pci;
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}
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EXPORT_SYMBOL_GPL(edac_pci_alloc_ctl_info);
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/*
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* edac_pci_free_ctl_info()
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* frees the memory allocated by edac_pci_alloc_ctl_info() function
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*/
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void edac_pci_free_ctl_info(struct edac_pci_ctl_info *pci)
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{
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kfree(pci);
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}
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EXPORT_SYMBOL_GPL(edac_pci_free_ctl_info);
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/*
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* find_edac_pci_by_dev()
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* scans the edac_pci list for a specific 'struct device *'
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*/
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static struct edac_pci_ctl_info * find_edac_pci_by_dev(struct device *dev)
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{
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struct edac_pci_ctl_info *pci;
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struct list_head *item;
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debugf3("%s()\n", __func__);
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list_for_each(item, &edac_pci_list) {
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pci = list_entry(item, struct edac_pci_ctl_info, link);
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if (pci->dev == dev)
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return pci;
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}
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return NULL;
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}
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/*
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* add_edac_pci_to_global_list
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* Before calling this function, caller must assign a unique value to
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* edac_dev->pci_idx.
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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_pci_to_global_list(struct edac_pci_ctl_info *pci)
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{
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struct list_head *item, *insert_before;
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struct edac_pci_ctl_info *rover;
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insert_before = &edac_pci_list;
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/* Determine if already on the list */
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if (unlikely((rover = find_edac_pci_by_dev(pci->dev)) != NULL))
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goto fail0;
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/* Insert in ascending order by 'pci_idx', so find position */
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list_for_each(item, &edac_pci_list) {
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rover = list_entry(item, struct edac_pci_ctl_info, link);
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if (rover->pci_idx >= pci->pci_idx) {
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if (unlikely(rover->pci_idx == pci->pci_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(&pci->link, insert_before);
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return 0;
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fail0:
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edac_printk(KERN_WARNING, EDAC_PCI,
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"%s (%s) %s %s already assigned %d\n",
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rover->dev->bus_id, dev_name(rover),
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rover->mod_name, rover->ctl_name, rover->pci_idx);
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return 1;
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fail1:
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edac_printk(KERN_WARNING, EDAC_PCI,
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"but in low-level driver: attempt to assign\n"
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"\tduplicate pci_idx %d in %s()\n", rover->pci_idx, __func__);
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return 1;
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}
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/*
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* complete_edac_pci_list_del
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*/
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static void complete_edac_pci_list_del(struct rcu_head *head)
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{
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struct edac_pci_ctl_info *pci;
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pci = container_of(head, struct edac_pci_ctl_info, rcu);
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INIT_LIST_HEAD(&pci->link);
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complete(&pci->complete);
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}
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/*
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* del_edac_pci_from_global_list
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*/
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static void del_edac_pci_from_global_list(struct edac_pci_ctl_info *pci)
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{
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list_del_rcu(&pci->link);
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init_completion(&pci->complete);
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call_rcu(&pci->rcu, complete_edac_pci_list_del);
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wait_for_completion(&pci->complete);
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}
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/*
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* edac_pci_find()
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* Search for an edac_pci_ctl_info structure whose index is 'idx'
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*
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* If found, return a pointer to the structure
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* Else return NULL.
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*
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* Caller must hold pci_ctls_mutex.
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*/
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struct edac_pci_ctl_info * edac_pci_find(int idx)
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{
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struct list_head *item;
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struct edac_pci_ctl_info *pci;
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/* Iterage over list, looking for exact match of ID */
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list_for_each(item, &edac_pci_list) {
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pci = list_entry(item, struct edac_pci_ctl_info, link);
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if (pci->pci_idx >= idx) {
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if (pci->pci_idx == idx)
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return pci;
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/* not on list, so terminate early */
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break;
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}
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}
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return NULL;
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}
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EXPORT_SYMBOL_GPL(edac_pci_find);
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/*
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* edac_pci_workq_function()
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* performs the operation scheduled by a workq request
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*/
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#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,20))
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static void edac_pci_workq_function(struct work_struct *work_req)
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{
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struct delayed_work *d_work = (struct delayed_work *)work_req;
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struct edac_pci_ctl_info *pci = to_edac_pci_ctl_work(d_work);
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#else
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static void edac_pci_workq_function(void *ptr)
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{
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struct edac_pci_ctl_info *pci = ptr;
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#endif
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edac_lock_pci_list();
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if ((pci->op_state == OP_RUNNING_POLL) &&
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(pci->edac_check != NULL) &&
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(pci->check_parity_error))
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pci->edac_check(pci);
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edac_unlock_pci_list();
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/* Reschedule */
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queue_delayed_work(edac_workqueue, &pci->work, pci->delay);
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}
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/*
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* edac_pci_workq_setup()
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* initialize a workq item for this edac_pci instance
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* passing in the new delay period in msec
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*/
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static void edac_pci_workq_setup(struct edac_pci_ctl_info *pci,
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unsigned int msec)
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{
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debugf0("%s()\n", __func__);
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pci->poll_msec = msec;
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edac_calc_delay(pci);
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#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,20))
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INIT_DELAYED_WORK(&pci->work, edac_pci_workq_function);
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#else
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INIT_WORK(&pci->work, edac_pci_workq_function, pci);
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#endif
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queue_delayed_work(edac_workqueue, &pci->work, pci->delay);
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}
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/*
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* edac_pci_workq_teardown()
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* stop the workq processing on this edac_pci instance
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*/
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static void edac_pci_workq_teardown(struct edac_pci_ctl_info *pci)
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{
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int status;
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status = cancel_delayed_work(&pci->work);
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if (status == 0)
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flush_workqueue(edac_workqueue);
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}
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/*
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* edac_pci_reset_delay_period
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*/
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void edac_pci_reset_delay_period(struct edac_pci_ctl_info *pci,
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unsigned long value)
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{
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edac_lock_pci_list();
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edac_pci_workq_teardown(pci);
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edac_pci_workq_setup(pci, value);
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edac_unlock_pci_list();
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}
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EXPORT_SYMBOL_GPL(edac_pci_reset_delay_period);
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/*
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* edac_pci_add_device: Insert the 'edac_dev' structure into the
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* edac_pci global list and create sysfs entries associated with
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* edac_pci structure.
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* @pci: pointer to the edac_device structure to be added to the list
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* @edac_idx: A unique numeric identifier to be assigned to the
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* 'edac_pci' structure.
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*
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* Return:
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* 0 Success
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* !0 Failure
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*/
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int edac_pci_add_device(struct edac_pci_ctl_info *pci, int edac_idx)
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{
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debugf0("%s()\n", __func__);
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pci->pci_idx = edac_idx;
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edac_lock_pci_list();
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if (add_edac_pci_to_global_list(pci))
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goto fail0;
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pci->start_time = jiffies;
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if (edac_pci_create_sysfs(pci)) {
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edac_pci_printk(pci, KERN_WARNING,
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"failed to create sysfs pci\n");
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goto fail1;
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}
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if (pci->edac_check != NULL) {
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pci->op_state = OP_RUNNING_POLL;
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edac_pci_workq_setup(pci, 1000);
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} else {
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pci->op_state = OP_RUNNING_INTERRUPT;
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}
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edac_pci_printk(pci, KERN_INFO,
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"Giving out device to module '%s' controller '%s':"
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" DEV '%s' (%s)\n",
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pci->mod_name,
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pci->ctl_name,
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dev_name(pci),
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edac_op_state_toString(pci->op_state));
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edac_unlock_pci_list();
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return 0;
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fail1:
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del_edac_pci_from_global_list(pci);
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fail0:
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edac_unlock_pci_list();
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return 1;
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}
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EXPORT_SYMBOL_GPL(edac_pci_add_device);
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/*
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* edac_pci_del_device()
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* Remove sysfs entries for specified edac_pci structure and
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* then remove edac_pci structure from global list
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*
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* @dev:
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* Pointer to 'struct device' representing edac_pci structure
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* to remove
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*
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* Return:
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* Pointer to removed edac_pci structure,
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* or NULL if device not found
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*/
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struct edac_pci_ctl_info * edac_pci_del_device(struct device *dev)
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{
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struct edac_pci_ctl_info *pci;
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debugf0("%s()\n", __func__);
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edac_lock_pci_list();
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if ((pci = find_edac_pci_by_dev(dev)) == NULL) {
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edac_unlock_pci_list();
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return NULL;
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}
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pci->op_state = OP_OFFLINE;
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edac_pci_workq_teardown(pci);
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edac_pci_remove_sysfs(pci);
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del_edac_pci_from_global_list(pci);
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edac_unlock_pci_list();
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edac_printk(KERN_INFO, EDAC_PCI,
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"Removed device %d for %s %s: DEV %s\n",
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pci->pci_idx,
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pci->mod_name,
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pci->ctl_name,
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dev_name(pci));
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return pci;
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}
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EXPORT_SYMBOL_GPL(edac_pci_del_device);
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static inline int edac_pci_get_log_pe(struct edac_pci_ctl_info *pci)
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{
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return pci->log_parity_error;
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}
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static inline int edac_pci_get_panic_on_pe(struct edac_pci_ctl_info *pci)
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{
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return pci->panic_on_pe;
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}
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void edac_pci_generic_check(struct edac_pci_ctl_info *pci)
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{
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edac_pci_do_parity_check();
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}
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static int edac_pci_idx = 0;
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#define EDAC_PCI_GENCTL_NAME "EDAC PCI controller"
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struct edac_pci_gen_data {
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int edac_idx;
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};
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struct edac_pci_ctl_info *
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edac_pci_create_generic_ctl(struct device *dev, const char *mod_name)
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{
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struct edac_pci_ctl_info *pci;
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struct edac_pci_gen_data *pdata;
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pci = edac_pci_alloc_ctl_info(sizeof(*pdata), EDAC_PCI_GENCTL_NAME);
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if (!pci)
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return NULL;
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pdata = pci->pvt_info;
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pci->dev = dev;
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dev_set_drvdata(pci->dev, pci);
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pci->dev_name = pci_name(to_pci_dev(dev));
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pci->mod_name = mod_name;
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pci->ctl_name = EDAC_PCI_GENCTL_NAME;
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pci->edac_check = edac_pci_generic_check;
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pdata->edac_idx = edac_pci_idx++;
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if (edac_pci_add_device(pci, pdata->edac_idx) > 0) {
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debugf3("%s(): failed edac_pci_add_device()\n", __func__);
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edac_pci_free_ctl_info(pci);
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return NULL;
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}
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return pci;
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}
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EXPORT_SYMBOL_GPL(edac_pci_create_generic_ctl);
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void edac_pci_release_generic_ctl(struct edac_pci_ctl_info *pci)
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{
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edac_pci_del_device(pci->dev);
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edac_pci_free_ctl_info(pci);
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}
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EXPORT_SYMBOL_GPL(edac_pci_release_generic_ctl);
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