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RAS/CEC: Convert the timer callback to a workqueue

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cec_timer_fn() is a timer callback which reads ce_arr.array[] and
updates its decay values. However, it runs in interrupt context and the
mutex protection the CEC uses for that array, is inadequate. Convert the
used timer to a workqueue to keep the tasks the CEC performs preemptible
and thus low-prio.

 [ bp: Rewrite commit message.
   s/timer/decay/gi to make it agnostic as to what facility is used. ]

Fixes: 011d826111 ("RAS: Add a Corrected Errors Collector")
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Tony Luck <tony.luck@intel.com>
Cc: linux-edac <linux-edac@vger.kernel.org>
Cc: <stable@vger.kernel.org>
Link: https://lkml.kernel.org/r/20190416213351.28999-2-xiyou.wangcong@gmail.com
This commit is contained in:
Cong Wang 2019-04-16 14:33:51 -07:00 committed by Borislav Petkov
parent f3c74b38a5
commit 0ade0b6240
1 changed files with 22 additions and 24 deletions
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46
drivers/ras/cec.c
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@ -2,6 +2,7 @@
#include <linux/mm.h>
#include <linux/gfp.h>
#include <linux/kernel.h>
#include <linux/workqueue.h>
#include <asm/mce.h>
@ -123,16 +124,12 @@ static u64 dfs_pfn;
/* Amount of errors after which we offline */
static unsigned int count_threshold = COUNT_MASK;
/*
* The timer "decays" element count each timer_interval which is 24hrs by
* default.
*/
#define CEC_TIMER_DEFAULT_INTERVAL 24 * 60 * 60 /* 24 hrs */
#define CEC_TIMER_MIN_INTERVAL 1 * 60 * 60 /* 1h */
#define CEC_TIMER_MAX_INTERVAL 30 * 24 * 60 * 60 /* one month */
static struct timer_list cec_timer;
static u64 timer_interval = CEC_TIMER_DEFAULT_INTERVAL;
/* Each element "decays" each decay_interval which is 24hrs by default. */
#define CEC_DECAY_DEFAULT_INTERVAL 24 * 60 * 60 /* 24 hrs */
#define CEC_DECAY_MIN_INTERVAL 1 * 60 * 60 /* 1h */
#define CEC_DECAY_MAX_INTERVAL 30 * 24 * 60 * 60 /* one month */
static struct delayed_work cec_work;
static u64 decay_interval = CEC_DECAY_DEFAULT_INTERVAL;
/*
* Decrement decay value. We're using DECAY_BITS bits to denote decay of an
@ -160,20 +157,21 @@ static void do_spring_cleaning(struct ce_array *ca)
/*
* @interval in seconds
*/
static void cec_mod_timer(struct timer_list *t, unsigned long interval)
static void cec_mod_work(unsigned long interval)
{
unsigned long iv;
iv = interval * HZ + jiffies;
mod_timer(t, round_jiffies(iv));
iv = interval * HZ;
mod_delayed_work(system_wq, &cec_work, round_jiffies(iv));
}
static void cec_timer_fn(struct timer_list *unused)
static void cec_work_fn(struct work_struct *work)
{
mutex_lock(&ce_mutex);
do_spring_cleaning(&ce_arr);
mutex_unlock(&ce_mutex);
cec_mod_timer(&cec_timer, timer_interval);
cec_mod_work(decay_interval);
}
/*
@ -380,15 +378,15 @@ static int decay_interval_set(void *data, u64 val)
{
*(u64 *)data = val;
if (val < CEC_TIMER_MIN_INTERVAL)
if (val < CEC_DECAY_MIN_INTERVAL)
return -EINVAL;
if (val > CEC_TIMER_MAX_INTERVAL)
if (val > CEC_DECAY_MAX_INTERVAL)
return -EINVAL;
timer_interval = val;
decay_interval = val;
cec_mod_timer(&cec_timer, timer_interval);
cec_mod_work(decay_interval);
return 0;
}
DEFINE_DEBUGFS_ATTRIBUTE(decay_interval_ops, u64_get, decay_interval_set, "%lld\n");
@ -432,7 +430,7 @@ static int array_dump(struct seq_file *m, void *v)
seq_printf(m, "Flags: 0x%x\n", ca->flags);
seq_printf(m, "Timer interval: %lld seconds\n", timer_interval);
seq_printf(m, "Decay interval: %lld seconds\n", decay_interval);
seq_printf(m, "Decays: %lld\n", ca->decays_done);
seq_printf(m, "Action threshold: %d\n", count_threshold);
@ -478,7 +476,7 @@ static int __init create_debugfs_nodes(void)
}
decay = debugfs_create_file("decay_interval", S_IRUSR | S_IWUSR, d,
&timer_interval, &decay_interval_ops);
&decay_interval, &decay_interval_ops);
if (!decay) {
pr_warn("Error creating decay_interval debugfs node!\n");
goto err;
@ -514,8 +512,8 @@ void __init cec_init(void)
if (create_debugfs_nodes())
return;
timer_setup(&cec_timer, cec_timer_fn, 0);
cec_mod_timer(&cec_timer, CEC_TIMER_DEFAULT_INTERVAL);
INIT_DELAYED_WORK(&cec_work, cec_work_fn);
schedule_delayed_work(&cec_work, CEC_DECAY_DEFAULT_INTERVAL);
pr_info("Correctable Errors collector initialized.\n");
}