soc/intel/cmn/cpu: Add function to disable 3-strike CATERR

In Intel designs, internal processor errors, such as a processor
instruction retirement watchdog timeout (also known as a 3-strike
timeout) will cause a CATERR assertion and can only be recovered from by
a system reset.

This patch prevents the Three Strike Counter from incrementing (as per
Intel EDS doc: 630094), which would help to disable Machine Check Catastrophic error. It will provide more opportunity to collect more useful CPU traces for debugging.

TEST=Able to build and boot google/rex.

Signed-off-by: Subrata Banik <subratabanik@google.com>
Change-Id: I286037cb00603f5fbc434cd1facc5e906718ba2f
Reviewed-on: https://review.coreboot.org/c/coreboot/+/74158
Reviewed-by: Lean Sheng Tan <sheng.tan@9elements.com>
Reviewed-by: Eric Lai <eric_lai@quanta.corp-partner.google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Maximilian Brune <maximilian.brune@9elements.com>

1 files changed, 9 insertions, 0 deletions

diff --git a/src/soc/intel/common/block/cpu/cpulib.c b/src/soc/intel/common/block/cpu/cpulib.c
index bfa4818450..3f0ee674f4 100644
--- a/src/soc/intel/common/block/cpu/cpulib.c
+++ b/src/soc/intel/common/block/cpu/cpulib.c
@@ -569,3 +569,12 @@ unsigned int smbios_cpu_get_max_speed_mhz(void)
 {
 	return cpu_get_max_turbo_ratio() * CONFIG_CPU_BCLK_MHZ;
 }
+
+void disable_three_strike_error(void)
+{
+	msr_t msr;
+
+	msr = rdmsr(MSR_PREFETCH_CTL);
+	msr.lo = msr.lo | DISABLE_CPU_ERROR;
+	wrmsr(MSR_PREFETCH_CTL, msr);
+}