x86/mce: Restore MCA polling interval halving

RongQing reported that the MCA polling interval doesn't halve when an
error gets logged. It was traced down to the commit in Fixes:, because:

  mce_timer_fn()
  |-> mce_poll_banks()
  |-> machine_check_poll()
  |-> mce_log()

which will queue the work and return.

Now, back in mce_timer_fn():

        /*
         * Alert userspace if needed. If we logged an MCE, reduce the polling
         * interval, otherwise increase the polling interval.
         */
        if (mce_notify_irq())

<--- here we haven't ran the notifier chain yet so mce_need_notify is
not set yet so this won't hit and we won't halve the interval iv.

Now the notifier chain runs. mce_early_notifier() sets the bit, does
mce_notify_irq(), that clears the bit and then the notifier chain
a little later logs the error.

So this is a silly timing issue.

But, that's all unnecessary.

All it needs to happen here is, the "should we notify of a logged MCE"
mce_notify_irq() asks, should be simply a question to the mce gen pool:
"Are you empty?"

And that then turns into a simple yes or no answer and it all
JustWorks(tm).

So do that and also distribute the functionality where it belongs:
 - Print that MCE events have been logged in mce_log()
 - Trigger the mcelog tool specific work in the first notifier

As a result, mce_notify_irq() can go now.

Fixes: 011d82611172 ("RAS: Add a Corrected Errors Collector")
Reported-by: Li RongQing <lirongqing@baidu.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Qiuxu Zhuo <qiuxu.zhuo@intel.com>
Tested-by: Qiuxu Zhuo <qiuxu.zhuo@intel.com>
Link: https://lore.kernel.org/r/20260112082747.2842-1-lirongqing@baidu.com

diff --git a/arch/x86/kernel/cpu/mce/core.c b/arch/x86/kernel/cpu/mce/core.c
index 8dd424ac5de8a82d16dc08217a909df6e7b19061..f3a793e3a6c8fa65910e6585220a08135793b176 100644 (file)
--- a/arch/x86/kernel/cpu/mce/core.c
+++ b/arch/x86/kernel/cpu/mce/core.c
@@ -90,7 +90,6 @@ struct mca_config mca_cfg __read_mostly = {
 };
 
 static DEFINE_PER_CPU(struct mce_hw_err, hw_errs_seen);
-static unsigned long mce_need_notify;
 
 /*
  * MCA banks polled by the period polling timer for corrected events.
@@ -152,8 +151,10 @@ EXPORT_PER_CPU_SYMBOL_GPL(injectm);
 
 void mce_log(struct mce_hw_err *err)
 {
-       if (mce_gen_pool_add(err))
+       if (mce_gen_pool_add(err)) {
+               pr_info(HW_ERR "Machine check events logged\n");
                irq_work_queue(&mce_irq_work);
+       }
 }
 EXPORT_SYMBOL_GPL(mce_log);
 
@@ -585,28 +586,6 @@ bool mce_is_correctable(struct mce *m)
 }
 EXPORT_SYMBOL_GPL(mce_is_correctable);
 
-/*
- * Notify the user(s) about new machine check events.
- * Can be called from interrupt context, but not from machine check/NMI
- * context.
- */
-static bool mce_notify_irq(void)
-{
-       /* Not more than two messages every minute */
-       static DEFINE_RATELIMIT_STATE(ratelimit, 60*HZ, 2);
-
-       if (test_and_clear_bit(0, &mce_need_notify)) {
-               mce_work_trigger();
-
-               if (__ratelimit(&ratelimit))
-                       pr_info(HW_ERR "Machine check events logged\n");
-
-               return true;
-       }
-
-       return false;
-}
-
 static int mce_early_notifier(struct notifier_block *nb, unsigned long val,
                              void *data)
 {
@@ -618,9 +597,7 @@ static int mce_early_notifier(struct notifier_block *nb, unsigned long val,
        /* Emit the trace record: */
        trace_mce_record(err);
 
-       set_bit(0, &mce_need_notify);
-
-       mce_notify_irq();
+       mce_work_trigger();
 
        return NOTIFY_DONE;
 }
@@ -1804,7 +1781,7 @@ static void mce_timer_fn(struct timer_list *t)
         * Alert userspace if needed. If we logged an MCE, reduce the polling
         * interval, otherwise increase the polling interval.
         */
-       if (mce_notify_irq())
+       if (!mce_gen_pool_empty())
                iv = max(iv / 2, (unsigned long) HZ/100);
        else
                iv = min(iv * 2, round_jiffies_relative(check_interval * HZ));