Change in coreboot[master]: [UNTESTED]soc/intel/xeon_sp/skx: Load MCU on AP

[Arthur Heymans (Code Review)]

Attention is currently required from: Patrick Rudolph.
Arthur Heymans has uploaded this change for review. ( https://review.coreboot.org/c/coreboot/+/49829 )

Change subject: [UNTESTED]soc/intel/xeon_sp/skx: Load MCU on AP
......................................................................

[UNTESTED]soc/intel/xeon_sp/skx: Load MCU on AP

On server platforms the FIT mechanism only updates MCU on the BSP.

TODO: test if parallel loading works (it does not on CPX)

Change-Id: I06c32918324511aae017d20335185429adb6c145
Signed-off-by: Arthur Heymans 
---
M src/soc/intel/xeon_sp/skx/cpu.c
1 file changed, 22 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/29/49829/1

diff --git a/src/soc/intel/xeon_sp/skx/cpu.c b/src/soc/intel/xeon_sp/skx/cpu.c
index f9cd356..5158ea4 100644
--- a/src/soc/intel/xeon_sp/skx/cpu.c
+++ b/src/soc/intel/xeon_sp/skx/cpu.c
@@ -14,9 +14,11 @@
 #include <soc/util.h>
 #include <assert.h>
 #include "chip.h"
+#include <cpu/intel/microcode.h>
 #include <cpu/intel/smm_reloc.h>
 #include <cpu/intel/em64t101_save_state.h>

+static const void *microcode_patch;

static const config_t *chip_config = NULL;

@@ -44,6 +46,17 @@
    mca_configure();
 }

+/*
+ * On server platforms the FIT mechanism only updates the microcode on
+ * the BMC. Loading MCU on AP in parallel seems to fail in 10% of the cases
+ * so do it serialized.
+ */
+static void get_microcode_info(const void **microcode, int *parallel)
+{
+	*microcode = microcode_patch;
+	*parallel = 0;
+}
+
 static void xeon_sp_core_init(struct device *cpu)
 {
    msr_t msr;
@@ -219,6 +232,7 @@
    .get_smm_info = get_smm_info,
    .pre_mp_smm_init = smm_initialize,
    .relocation_handler = smm_relocation_handler,
+	.get_microcode_info = get_microcode_info,
    .post_mp_init = post_mp_init,
 };

@@ -226,6 +240,14 @@
 {
    FUNC_ENTER();

+	microcode_patch = intel_microcode_find();
+
+	if (!microcode_patch)
+		printk(BIOS_ERR, "microcode not found in CBFS!\n");
+
+	/* This is normally already done via FIT. */
+	intel_microcode_load_unlocked(microcode_patch);
+
    /*
     * This gets used in cpu device callback. Other than cpu 0,
     * rest of the CPU devices do not have