diff options
author | Dave Jiang <djiang@mvista.com> | 2007-07-19 08:49:52 (GMT) |
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committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-07-19 17:04:54 (GMT) |
commit | 91b99041c1d577ded1da599ddc28cec2e07253cf (patch) | |
tree | 21b132d19166dca5c363b98e20741b78df4ad68a /drivers/edac/edac_pci.c | |
parent | 81d87cb13e367bb804bf44889ae0de7369705d6c (diff) | |
download | linux-91b99041c1d577ded1da599ddc28cec2e07253cf.tar.xz |
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>
Diffstat (limited to 'drivers/edac/edac_pci.c')
-rw-r--r-- | drivers/edac/edac_pci.c | 451 |
1 files changed, 451 insertions, 0 deletions
diff --git a/drivers/edac/edac_pci.c b/drivers/edac/edac_pci.c new file mode 100644 index 0000000..677c603 --- /dev/null +++ b/drivers/edac/edac_pci.c @@ -0,0 +1,451 @@ +/* + * EDAC PCI component + * + * Author: Dave Jiang <djiang@mvista.com> + * + * 2007 (c) MontaVista Software, Inc. This file is licensed under + * the terms of the GNU General Public License version 2. This program + * is licensed "as is" without any warranty of any kind, whether express + * or implied. + * + */ +#include <linux/module.h> +#include <linux/types.h> +#include <linux/smp.h> +#include <linux/init.h> +#include <linux/sysctl.h> +#include <linux/highmem.h> +#include <linux/timer.h> +#include <linux/slab.h> +#include <linux/spinlock.h> +#include <linux/list.h> +#include <linux/sysdev.h> +#include <linux/ctype.h> +#include <linux/workqueue.h> +#include <asm/uaccess.h> +#include <asm/page.h> + +#include "edac_core.h" +#include "edac_module.h" + +static DEFINE_MUTEX(edac_pci_ctls_mutex); +static struct list_head edac_pci_list = LIST_HEAD_INIT(edac_pci_list); + +static inline void edac_lock_pci_list(void) +{ + mutex_lock(&edac_pci_ctls_mutex); +} + +static inline void edac_unlock_pci_list(void) +{ + mutex_unlock(&edac_pci_ctls_mutex); +} + +/* + * The alloc() and free() functions for the 'edac_pci' control info + * structure. The chip driver will allocate one of these for each + * edac_pci it is going to control/register with the EDAC CORE. + */ +struct edac_pci_ctl_info * edac_pci_alloc_ctl_info( + unsigned int sz_pvt, + const char *edac_pci_name) +{ + struct edac_pci_ctl_info *pci; + void *pvt; + unsigned int size; + + pci = (struct edac_pci_ctl_info *)0; + pvt = edac_align_ptr(&pci[1], sz_pvt); + size = ((unsigned long)pvt) + sz_pvt; + + if ((pci = kzalloc(size, GFP_KERNEL)) == NULL) + return NULL; + + pvt = sz_pvt ? ((char *)pci) + ((unsigned long)pvt) : NULL; + + pci->pvt_info = pvt; + + pci->op_state = OP_ALLOC; + + snprintf(pci->name, strlen(edac_pci_name)+1, "%s", edac_pci_name); + + return pci; +} +EXPORT_SYMBOL_GPL(edac_pci_alloc_ctl_info); + +/* + * edac_pci_free_ctl_info() + * frees the memory allocated by edac_pci_alloc_ctl_info() function + */ +void edac_pci_free_ctl_info(struct edac_pci_ctl_info *pci) +{ + kfree(pci); +} +EXPORT_SYMBOL_GPL(edac_pci_free_ctl_info); + +/* + * find_edac_pci_by_dev() + * scans the edac_pci list for a specific 'struct device *' + */ +static struct edac_pci_ctl_info * find_edac_pci_by_dev(struct device *dev) +{ + struct edac_pci_ctl_info *pci; + struct list_head *item; + + debugf3("%s()\n", __func__); + + list_for_each(item, &edac_pci_list) { + pci = list_entry(item, struct edac_pci_ctl_info, link); + + if (pci->dev == dev) + return pci; + } + + return NULL; +} + +/* + * add_edac_pci_to_global_list + * Before calling this function, caller must assign a unique value to + * edac_dev->pci_idx. + * Return: + * 0 on success + * 1 on failure + */ +static int add_edac_pci_to_global_list(struct edac_pci_ctl_info *pci) +{ + struct list_head *item, *insert_before; + struct edac_pci_ctl_info *rover; + + insert_before = &edac_pci_list; + + /* Determine if already on the list */ + if (unlikely((rover = find_edac_pci_by_dev(pci->dev)) != NULL)) + goto fail0; + + /* Insert in ascending order by 'pci_idx', so find position */ + list_for_each(item, &edac_pci_list) { + rover = list_entry(item, struct edac_pci_ctl_info, link); + + if (rover->pci_idx >= pci->pci_idx) { + if (unlikely(rover->pci_idx == pci->pci_idx)) + goto fail1; + + insert_before = item; + break; + } + } + + list_add_tail_rcu(&pci->link, insert_before); + return 0; + +fail0: + edac_printk(KERN_WARNING, EDAC_PCI, + "%s (%s) %s %s already assigned %d\n", + rover->dev->bus_id, dev_name(rover), + rover->mod_name, rover->ctl_name, rover->pci_idx); + return 1; + +fail1: + edac_printk(KERN_WARNING, EDAC_PCI, + "but in low-level driver: attempt to assign\n" + "\tduplicate pci_idx %d in %s()\n", rover->pci_idx, __func__); + return 1; +} + +/* + * complete_edac_pci_list_del + */ +static void complete_edac_pci_list_del(struct rcu_head *head) +{ + struct edac_pci_ctl_info *pci; + + pci = container_of(head, struct edac_pci_ctl_info, rcu); + INIT_LIST_HEAD(&pci->link); + complete(&pci->complete); +} + +/* + * del_edac_pci_from_global_list + */ +static void del_edac_pci_from_global_list(struct edac_pci_ctl_info *pci) +{ + list_del_rcu(&pci->link); + init_completion(&pci->complete); + call_rcu(&pci->rcu, complete_edac_pci_list_del); + wait_for_completion(&pci->complete); +} + +/* + * edac_pci_find() + * Search for an edac_pci_ctl_info structure whose index is 'idx' + * + * If found, return a pointer to the structure + * Else return NULL. + * + * Caller must hold pci_ctls_mutex. + */ +struct edac_pci_ctl_info * edac_pci_find(int idx) +{ + struct list_head *item; + struct edac_pci_ctl_info *pci; + + /* Iterage over list, looking for exact match of ID */ + list_for_each(item, &edac_pci_list) { + pci = list_entry(item, struct edac_pci_ctl_info, link); + + if (pci->pci_idx >= idx) { + if (pci->pci_idx == idx) + return pci; + + /* not on list, so terminate early */ + break; + } + } + + return NULL; +} +EXPORT_SYMBOL_GPL(edac_pci_find); + +/* + * edac_pci_workq_function() + * performs the operation scheduled by a workq request + */ +#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,20)) +static void edac_pci_workq_function(struct work_struct *work_req) +{ + struct delayed_work *d_work = (struct delayed_work *)work_req; + struct edac_pci_ctl_info *pci = to_edac_pci_ctl_work(d_work); +#else +static void edac_pci_workq_function(void *ptr) +{ + struct edac_pci_ctl_info *pci = ptr; +#endif + + edac_lock_pci_list(); + + if ((pci->op_state == OP_RUNNING_POLL) && + (pci->edac_check != NULL) && + (pci->check_parity_error)) + pci->edac_check(pci); + + edac_unlock_pci_list(); + + /* Reschedule */ + queue_delayed_work(edac_workqueue, &pci->work, pci->delay); +} + +/* + * edac_pci_workq_setup() + * initialize a workq item for this edac_pci instance + * passing in the new delay period in msec + */ +static void edac_pci_workq_setup(struct edac_pci_ctl_info *pci, + unsigned int msec) +{ + debugf0("%s()\n", __func__); + + pci->poll_msec = msec; + edac_calc_delay(pci); + +#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,20)) + INIT_DELAYED_WORK(&pci->work, edac_pci_workq_function); +#else + INIT_WORK(&pci->work, edac_pci_workq_function, pci); +#endif + queue_delayed_work(edac_workqueue, &pci->work, pci->delay); +} + +/* + * edac_pci_workq_teardown() + * stop the workq processing on this edac_pci instance + */ +static void edac_pci_workq_teardown(struct edac_pci_ctl_info *pci) +{ + int status; + + status = cancel_delayed_work(&pci->work); + if (status == 0) + flush_workqueue(edac_workqueue); +} + +/* + * edac_pci_reset_delay_period + */ +void edac_pci_reset_delay_period(struct edac_pci_ctl_info *pci, + unsigned long value) +{ + edac_lock_pci_list(); + + edac_pci_workq_teardown(pci); + + edac_pci_workq_setup(pci, value); + + edac_unlock_pci_list(); +} +EXPORT_SYMBOL_GPL(edac_pci_reset_delay_period); + +/* + * edac_pci_add_device: Insert the 'edac_dev' structure into the + * edac_pci global list and create sysfs entries associated with + * edac_pci structure. + * @pci: pointer to the edac_device structure to be added to the list + * @edac_idx: A unique numeric identifier to be assigned to the + * 'edac_pci' structure. + * + * Return: + * 0 Success + * !0 Failure + */ +int edac_pci_add_device(struct edac_pci_ctl_info *pci, int edac_idx) +{ + debugf0("%s()\n", __func__); + + pci->pci_idx = edac_idx; + + edac_lock_pci_list(); + + if (add_edac_pci_to_global_list(pci)) + goto fail0; + + pci->start_time = jiffies; + + if (edac_pci_create_sysfs(pci)) { + edac_pci_printk(pci, KERN_WARNING, + "failed to create sysfs pci\n"); + goto fail1; + } + + if (pci->edac_check != NULL) { + pci->op_state = OP_RUNNING_POLL; + + edac_pci_workq_setup(pci, 1000); + } else { + pci->op_state = OP_RUNNING_INTERRUPT; + } + + edac_pci_printk(pci, KERN_INFO, + "Giving out device to module '%s' controller '%s':" + " DEV '%s' (%s)\n", + pci->mod_name, + pci->ctl_name, + dev_name(pci), + edac_op_state_toString(pci->op_state)); + + edac_unlock_pci_list(); + return 0; + +fail1: + del_edac_pci_from_global_list(pci); +fail0: + edac_unlock_pci_list(); + return 1; +} +EXPORT_SYMBOL_GPL(edac_pci_add_device); + +/* + * edac_pci_del_device() + * Remove sysfs entries for specified edac_pci structure and + * then remove edac_pci structure from global list + * + * @dev: + * Pointer to 'struct device' representing edac_pci structure + * to remove + * + * Return: + * Pointer to removed edac_pci structure, + * or NULL if device not found + */ +struct edac_pci_ctl_info * edac_pci_del_device(struct device *dev) +{ + struct edac_pci_ctl_info *pci; + + debugf0("%s()\n", __func__); + + edac_lock_pci_list(); + + if ((pci = find_edac_pci_by_dev(dev)) == NULL) { + edac_unlock_pci_list(); + return NULL; + } + + pci->op_state = OP_OFFLINE; + + edac_pci_workq_teardown(pci); + + edac_pci_remove_sysfs(pci); + + del_edac_pci_from_global_list(pci); + + edac_unlock_pci_list(); + + edac_printk(KERN_INFO, EDAC_PCI, + "Removed device %d for %s %s: DEV %s\n", + pci->pci_idx, + pci->mod_name, + pci->ctl_name, + dev_name(pci)); + + return pci; +} +EXPORT_SYMBOL_GPL(edac_pci_del_device); + +static inline int edac_pci_get_log_pe(struct edac_pci_ctl_info *pci) +{ + return pci->log_parity_error; +} + +static inline int edac_pci_get_panic_on_pe(struct edac_pci_ctl_info *pci) +{ + return pci->panic_on_pe; +} + +void edac_pci_generic_check(struct edac_pci_ctl_info *pci) +{ + edac_pci_do_parity_check(); +} + +static int edac_pci_idx = 0; +#define EDAC_PCI_GENCTL_NAME "EDAC PCI controller" + +struct edac_pci_gen_data { + int edac_idx; +}; + +struct edac_pci_ctl_info * +edac_pci_create_generic_ctl(struct device *dev, const char *mod_name) +{ + struct edac_pci_ctl_info *pci; + struct edac_pci_gen_data *pdata; + + pci = edac_pci_alloc_ctl_info(sizeof(*pdata), EDAC_PCI_GENCTL_NAME); + if (!pci) + return NULL; + + pdata = pci->pvt_info; + pci->dev = dev; + dev_set_drvdata(pci->dev, pci); + pci->dev_name = pci_name(to_pci_dev(dev)); + + pci->mod_name = mod_name; + pci->ctl_name = EDAC_PCI_GENCTL_NAME; + pci->edac_check = edac_pci_generic_check; + + pdata->edac_idx = edac_pci_idx++; + + if (edac_pci_add_device(pci, pdata->edac_idx) > 0) { + debugf3("%s(): failed edac_pci_add_device()\n", __func__); + edac_pci_free_ctl_info(pci); + return NULL; + } + + return pci; +} +EXPORT_SYMBOL_GPL(edac_pci_create_generic_ctl); + +void edac_pci_release_generic_ctl(struct edac_pci_ctl_info *pci) +{ + edac_pci_del_device(pci->dev); + edac_pci_free_ctl_info(pci); +} +EXPORT_SYMBOL_GPL(edac_pci_release_generic_ctl); |