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drivers/edac: mod MC to use workq instead of kthread

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Move the memory controller object to work queue based implementation from the
kernel thread based.

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 2007-07-19 01:49:52 -07:00 committed by Linus Torvalds
parent 535c6a5303
commit 81d87cb13e
6 changed files with 177 additions and 97 deletions
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14
drivers/edac/edac_core.h
View file

@ -382,6 +382,15 @@ struct mem_ctl_info {
/* edac sysfs device control */
struct kobject edac_mci_kobj;
struct completion kobj_complete;
/* work struct for this MC */
#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,20))
struct delayed_work work;
#else
struct work_struct work;
#endif
/* the internal state of this controller instance */
int op_state;
};
/*
@ -573,6 +582,9 @@ struct edac_device_ctl_info {
};
/* To get from the instance's wq to the beginning of the ctl structure */
#define to_edac_mem_ctl_work(w) \
container_of(w, struct mem_ctl_info, work)
#define to_edac_device_ctl_work(w) \
container_of(w,struct edac_device_ctl_info,work)
@ -584,6 +596,8 @@ static inline void edac_device_calc_delay(
edac_dev->delay = edac_dev->poll_msec * HZ / 1000;
}
#define edac_calc_delay(dev) dev->delay = dev->poll_msec * HZ / 1000;
/*
* The alloc() and free() functions for the 'edac_device' control info
* structure. A MC driver will allocate one of these for each edac_device

36
drivers/edac/edac_device.c
View file

@ -332,17 +332,17 @@ EXPORT_SYMBOL(edac_device_find);
/*
* edac_workq_function
* edac_device_workq_function
* performs the operation scheduled by a workq request
*/
#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,20))
static void edac_workq_function(struct work_struct *work_req)
static void edac_device_workq_function(struct work_struct *work_req)
{
struct delayed_work *d_work = (struct delayed_work*) work_req;
struct edac_device_ctl_info *edac_dev =
to_edac_device_ctl_work(d_work);
#else
static void edac_workq_function(void *ptr)
static void edac_device_workq_function(void *ptr)
{
struct edac_device_ctl_info *edac_dev =
(struct edac_device_ctl_info *) ptr;
@ -364,30 +364,31 @@ static void edac_workq_function(void *ptr)
}
/*
* edac_workq_setup
* edac_device_workq_setup
* initialize a workq item for this edac_device instance
* passing in the new delay period in msec
*/
void edac_workq_setup(struct edac_device_ctl_info *edac_dev, unsigned msec)
void edac_device_workq_setup(struct edac_device_ctl_info *edac_dev,
unsigned msec)
{
debugf0("%s()\n", __func__);
edac_dev->poll_msec = msec;
edac_device_calc_delay(edac_dev); /* Calc delay jiffies */
edac_calc_delay(edac_dev); /* Calc delay jiffies */
#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,20))
INIT_DELAYED_WORK(&edac_dev->work,edac_workq_function);
INIT_DELAYED_WORK(&edac_dev->work, edac_device_workq_function);
#else
INIT_WORK(&edac_dev->work,edac_workq_function,edac_dev);
INIT_WORK(&edac_dev->work, edac_device_workq_function, edac_dev);
#endif
queue_delayed_work(edac_workqueue,&edac_dev->work, edac_dev->delay);
queue_delayed_work(edac_workqueue, &edac_dev->work, edac_dev->delay);
}
/*
* edac_workq_teardown
* edac_device_workq_teardown
* stop the workq processing on this edac_dev
*/
void edac_workq_teardown(struct edac_device_ctl_info *edac_dev)
void edac_device_workq_teardown(struct edac_device_ctl_info *edac_dev)
{
int status;
@ -409,10 +410,10 @@ void edac_device_reset_delay_period(
lock_device_list();
/* cancel the current workq request */
edac_workq_teardown(edac_dev);
edac_device_workq_teardown(edac_dev);
/* restart the workq request, with new delay value */
edac_workq_setup(edac_dev, value);
edac_device_workq_setup(edac_dev, value);
unlock_device_list();
}
@ -479,8 +480,11 @@ int edac_device_add_device(struct edac_device_ctl_info *edac_dev, int edac_idx)
/* This instance is NOW RUNNING */
edac_dev->op_state = OP_RUNNING_POLL;
/* enable workq processing on this instance, default = 1000 msec */
edac_workq_setup(edac_dev, 1000);
/*
* enable workq processing on this instance,
* default = 1000 msec
*/
edac_device_workq_setup(edac_dev, 1000);
} else {
edac_dev->op_state = OP_RUNNING_INTERRUPT;
}
@ -538,7 +542,7 @@ struct edac_device_ctl_info * edac_device_del_device(struct device *dev)
edac_dev->op_state = OP_OFFLINE;
/* clear workq processing on this instance */
edac_workq_teardown(edac_dev);
edac_device_workq_teardown(edac_dev);
/* Tear down the sysfs entries for this instance */
edac_device_remove_sysfs(edac_dev);

119
drivers/edac/edac_mc.c
View file

@ -184,6 +184,8 @@ struct mem_ctl_info *edac_mc_alloc(unsigned sz_pvt, unsigned nr_csrows,
}
}
mci->op_state = OP_ALLOC;
return mci;
}
EXPORT_SYMBOL_GPL(edac_mc_alloc);
@ -215,6 +217,107 @@ static struct mem_ctl_info *find_mci_by_dev(struct device *dev)
return NULL;
}
/*
* handler for EDAC to check if NMI type handler has asserted interrupt
*/
static int edac_mc_assert_error_check_and_clear(void)
{
int vreg;
if(edac_op_state == EDAC_OPSTATE_POLL)
return 1;
vreg = atomic_read(&edac_err_assert);
if(vreg) {
atomic_set(&edac_err_assert, 0);
return 1;
}
return 0;
}
/*
* edac_mc_workq_function
* performs the operation scheduled by a workq request
*/
#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,20))
static void edac_mc_workq_function(struct work_struct *work_req)
{
struct delayed_work *d_work = (struct delayed_work*) work_req;
struct mem_ctl_info *mci = to_edac_mem_ctl_work(d_work);
#else
static void edac_mc_workq_function(void *ptr)
{
struct mem_ctl_info *mci = (struct mem_ctl_info *) ptr;
#endif
mutex_lock(&mem_ctls_mutex);
/* Only poll controllers that are running polled and have a check */
if (edac_mc_assert_error_check_and_clear() && (mci->edac_check != NULL))
mci->edac_check(mci);
/*
* FIXME: temp place holder for PCI checks,
* goes away when we break out PCI
*/
edac_pci_do_parity_check();
mutex_unlock(&mem_ctls_mutex);
/* Reschedule */
queue_delayed_work(edac_workqueue, &mci->work, edac_mc_get_poll_msec());
}
/*
* edac_mc_workq_setup
* initialize a workq item for this mci
* passing in the new delay period in msec
*/
void edac_mc_workq_setup(struct mem_ctl_info *mci, unsigned msec)
{
debugf0("%s()\n", __func__);
#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,20))
INIT_DELAYED_WORK(&mci->work, edac_mc_workq_function);
#else
INIT_WORK(&mci->work, edac_mc_workq_function, mci);
#endif
queue_delayed_work(edac_workqueue, &mci->work, msecs_to_jiffies(msec));
}
/*
* edac_mc_workq_teardown
* stop the workq processing on this mci
*/
void edac_mc_workq_teardown(struct mem_ctl_info *mci)
{
int status;
status = cancel_delayed_work(&mci->work);
if (status == 0) {
/* workq instance might be running, wait for it */
flush_workqueue(edac_workqueue);
}
}
/*
* edac_reset_delay_period
*/
void edac_reset_delay_period(struct mem_ctl_info *mci, unsigned long value)
{
mutex_lock(&mem_ctls_mutex);
/* cancel the current workq request */
edac_mc_workq_teardown(mci);
/* restart the workq request, with new delay value */
edac_mc_workq_setup(mci, value);
mutex_unlock(&mem_ctls_mutex);
}
/* Return 0 on success, 1 on failure.
* Before calling this function, caller must
* assign a unique value to mci->mc_idx.
@ -351,6 +454,16 @@ int edac_mc_add_mc(struct mem_ctl_info *mci, int mc_idx)
goto fail1;
}
/* If there IS a check routine, then we are running POLLED */
if (mci->edac_check != NULL) {
/* This instance is NOW RUNNING */
mci->op_state = OP_RUNNING_POLL;
edac_mc_workq_setup(mci, edac_mc_get_poll_msec());
} else {
mci->op_state = OP_RUNNING_INTERRUPT;
}
/* Report action taken */
edac_mc_printk(mci, KERN_INFO, "Giving out device to %s %s: DEV %s\n",
mci->mod_name, mci->ctl_name, dev_name(mci));
@ -386,6 +499,12 @@ struct mem_ctl_info * edac_mc_del_mc(struct device *dev)
return NULL;
}
/* marking MCI offline */
mci->op_state = OP_OFFLINE;
/* flush workq processes */
edac_mc_workq_teardown(mci);
edac_remove_sysfs_mci_device(mci);
del_mc_from_global_list(mci);
mutex_unlock(&mem_ctls_mutex);

14
drivers/edac/edac_mc_sysfs.c
View file

@ -22,22 +22,28 @@ static int panic_on_ue;
static int poll_msec = 1000;
/* Getter functions for above */
int edac_get_log_ue()
int edac_get_log_ue(void)
{
return log_ue;
}
int edac_get_log_ce()
int edac_get_log_ce(void)
{
return log_ce;
}
int edac_get_panic_on_ue()
int edac_get_panic_on_ue(void)
{
return panic_on_ue;
}
int edac_get_poll_msec()
/* this is temporary */
int edac_mc_get_poll_msec(void)
{
return edac_get_poll_msec();
}
int edac_get_poll_msec(void)
{
return poll_msec;
}

86
drivers/edac/edac_module.c
View file

@ -1,6 +1,14 @@
#include <linux/freezer.h>
#include <linux/kthread.h>
/*
* edac_module.c
*
* (C) 2007 www.douglaskthompson.com
* 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.
*
* Author: Doug Thompson <norsk5@xmission.com>
*
*/
#include <linux/edac.h>
#include "edac_core.h"
@ -17,10 +25,6 @@ EXPORT_SYMBOL_GPL(edac_debug_level);
/* scope is to module level only */
struct workqueue_struct *edac_workqueue;
/* private to this file */
static struct task_struct *edac_thread;
/*
* sysfs object: /sys/devices/system/edac
* need to export to other files in this modules
@ -84,63 +88,6 @@ static void edac_unregister_sysfs_edac_name(void)
edac_class_valid = 0;
}
/*
* Check MC status every edac_get_poll_msec().
* Check PCI status every edac_get_poll_msec() as well.
*
* This where the work gets done for edac.
*
* SMP safe, doesn't use NMI, and auto-rate-limits.
*/
static void do_edac_check(void)
{
debugf3("%s()\n", __func__);
/* perform the poll activities */
edac_check_mc_devices();
edac_pci_do_parity_check();
}
/*
* handler for EDAC to check if NMI type handler has asserted interrupt
*/
static int edac_assert_error_check_and_clear(void)
{
int vreg;
if(edac_op_state == EDAC_OPSTATE_POLL)
return 1;
vreg = atomic_read(&edac_err_assert);
if(vreg) {
atomic_set(&edac_err_assert, 0);
return 1;
}
return 0;
}
/*
* Action thread for EDAC to perform the POLL operations
*/
static int edac_kernel_thread(void *arg)
{
int msec;
while (!kthread_should_stop()) {
if(edac_assert_error_check_and_clear())
do_edac_check();
/* goto sleep for the interval */
msec = (HZ * edac_get_poll_msec()) / 1000;
schedule_timeout_interruptible(msec);
try_to_freeze();
}
return 0;
}
/*
* edac_workqueue_setup
* initialize the edac work queue for polling operations
@ -221,19 +168,9 @@ static int __init edac_init(void)
goto error_pci;
}
/* create our kernel thread */
edac_thread = kthread_run(edac_kernel_thread, NULL, "kedac");
if (IS_ERR(edac_thread)) {
err = PTR_ERR(edac_thread);
goto error_work;
}
return 0;
/* Error teardown stack */
error_work:
edac_workqueue_teardown();
error_pci:
edac_sysfs_pci_teardown();
error_mem:
@ -251,7 +188,6 @@ static int __init edac_init(void)
static void __exit edac_exit(void)
{
debugf0("%s()\n", __func__);
kthread_stop(edac_thread);
/* tear down the various subsystems*/
edac_workqueue_teardown();

5
drivers/edac/edac_module.h
View file

@ -28,6 +28,7 @@ extern int edac_get_log_ue(void);
extern int edac_get_log_ce(void);
extern int edac_get_panic_on_ue(void);
extern int edac_get_poll_msec(void);
extern int edac_mc_get_poll_msec(void);
extern int edac_device_create_sysfs(struct edac_device_ctl_info *edac_dev);
extern void edac_device_remove_sysfs(struct edac_device_ctl_info *edac_dev);
@ -35,9 +36,9 @@ extern struct sysdev_class *edac_get_edac_class(void);
/* edac core workqueue: single CPU mode */
extern struct workqueue_struct *edac_workqueue;
extern void edac_workq_setup(struct edac_device_ctl_info *edac_dev,
extern void edac_device_workq_setup(struct edac_device_ctl_info *edac_dev,
unsigned msec);
extern void edac_workq_teardown(struct edac_device_ctl_info *edac_dev);
extern void edac_device_workq_teardown(struct edac_device_ctl_info *edac_dev);
extern void edac_device_reset_delay_period(
struct edac_device_ctl_info *edac_dev,
unsigned long value);