From: Yazen Ghannam <yazen.ghannam@amd.com>
Date: Tue, 21 Jun 2022 15:59:43 +0000
Subject: x86/MCE/AMD: Clear DFR errors found in THR handler
Git-commit: bc1b705b0eee4c645ad8b3bbff3c8a66e9688362
Patch-mainline: 6.2-rc1
References: git-fixes
AMD's MCA Thresholding feature counts errors of all severity levels, not
just correctable errors. If a deferred error causes the threshold limit
to be reached (it was the error that caused the overflow), then both a
deferred error interrupt and a thresholding interrupt will be triggered.
The order of the interrupts is not guaranteed. If the threshold
interrupt handler is executed first, then it will clear MCA_STATUS for
the error. It will not check or clear MCA_DESTAT which also holds a copy
of the deferred error. When the deferred error interrupt handler runs it
will not find an error in MCA_STATUS, but it will find the error in
MCA_DESTAT. This will cause two errors to be logged.
Check for deferred errors when handling a threshold interrupt. If a bank
contains a deferred error, then clear the bank's MCA_DESTAT register.
Define a new helper function to do the deferred error check and clearing
of MCA_DESTAT.
[ bp: Simplify, convert comment to passive voice. ]
[js] we still have msr ops
Fixes: 37d43acfd79f ("x86/mce/AMD: Redo error logging from APIC LVT interrupt handlers")
Signed-off-by: Yazen Ghannam <yazen.ghannam@amd.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20220621155943.33623-1-yazen.ghannam@amd.com
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
---
arch/x86/kernel/cpu/mce/amd.c | 33 ++++++++++++++++++++-------------
1 file changed, 20 insertions(+), 13 deletions(-)
--- a/arch/x86/kernel/cpu/mce/amd.c
+++ b/arch/x86/kernel/cpu/mce/amd.c
@@ -988,6 +988,24 @@ _log_error_bank(unsigned int bank, u32 m
return status & MCI_STATUS_DEFERRED;
}
+static bool _log_error_deferred(unsigned int bank, u32 misc)
+{
+ if (!_log_error_bank(bank, msr_ops.status(bank),
+ msr_ops.addr(bank), misc))
+ return false;
+
+ /*
+ * Non-SMCA systems don't have MCA_DESTAT/MCA_DEADDR registers.
+ * Return true here to avoid accessing these registers.
+ */
+ if (!mce_flags.smca)
+ return true;
+
+ /* Clear MCA_DESTAT if the deferred error was logged from MCA_STATUS. */
+ wrmsrl(MSR_AMD64_SMCA_MCx_DESTAT(bank), 0);
+ return true;
+}
+
/*
* We have three scenarios for checking for Deferred errors:
*
@@ -999,19 +1017,8 @@ _log_error_bank(unsigned int bank, u32 m
*/
static void log_error_deferred(unsigned int bank)
{
- bool defrd;
-
- defrd = _log_error_bank(bank, msr_ops.status(bank),
- msr_ops.addr(bank), 0);
-
- if (!mce_flags.smca)
- return;
-
- /* Clear MCA_DESTAT if we logged the deferred error from MCA_STATUS. */
- if (defrd) {
- wrmsrl(MSR_AMD64_SMCA_MCx_DESTAT(bank), 0);
+ if (_log_error_deferred(bank, 0))
return;
- }
/*
* Only deferred errors are logged in MCA_DE{STAT,ADDR} so just check
@@ -1032,7 +1039,7 @@ static void amd_deferred_error_interrupt
static void log_error_thresholding(unsigned int bank, u64 misc)
{
- _log_error_bank(bank, msr_ops.status(bank), msr_ops.addr(bank), misc);
+ _log_error_deferred(bank, misc);
}
static void log_and_reset_block(struct threshold_block *block)