x86/MCE/AMD: Clear DFR errors found in THR handler

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. ]

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

diff --git a/arch/x86/kernel/cpu/mce/amd.c b/arch/x86/kernel/cpu/mce/amd.c
index 1c87501..10fb5b5 100644 (file)
--- a/arch/x86/kernel/cpu/mce/amd.c
+++ b/arch/x86/kernel/cpu/mce/amd.c
@@ -788,6 +788,24 @@ _log_error_bank(unsigned int bank, u32 msr_stat, u32 msr_addr, u64 misc)
        return status & MCI_STATUS_DEFERRED;
 }
 
+static bool _log_error_deferred(unsigned int bank, u32 misc)
+{
+       if (!_log_error_bank(bank, mca_msr_reg(bank, MCA_STATUS),
+                            mca_msr_reg(bank, MCA_ADDR), 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:
  *
@@ -799,19 +817,8 @@ _log_error_bank(unsigned int bank, u32 msr_stat, u32 msr_addr, u64 misc)
  */
 static void log_error_deferred(unsigned int bank)
 {
-       bool defrd;
-
-       defrd = _log_error_bank(bank, mca_msr_reg(bank, MCA_STATUS),
-                               mca_msr_reg(bank, MCA_ADDR), 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
@@ -832,7 +839,7 @@ static void amd_deferred_error_interrupt(void)
 
 static void log_error_thresholding(unsigned int bank, u64 misc)
 {
-       _log_error_bank(bank, mca_msr_reg(bank, MCA_STATUS), mca_msr_reg(bank, MCA_ADDR), misc);
+       _log_error_deferred(bank, misc);
 }
 
 static void log_and_reset_block(struct threshold_block *block)