[M] Change in coreboot[master]: cpu/x86/smm: Enable setting SMM console log level from mainboard

[Johnny Lin (Code Review)]

Attention is currently required from: Marc Jones, Martin L Roth, Patrick Rudolph, Johnny Lin, Rocky Phagura, Jingle Hsu, Angel Pons, Arthur Heymans, Morgan Jang, Kyösti Mälkki.

Hello build bot (Jenkins), Marc Jones, Nico Huber, Patrick Rudolph, Jonathan Zhang, Rocky Phagura, Jingle Hsu, Angel Pons, Rocky Phagura, Arthur Heymans, Morgan Jang,

I'd like you to reexamine a change. Please visit

https://review.coreboot.org/c/coreboot/+/49460

to look at the new patch set (#28).

Change subject: cpu/x86/smm: Enable setting SMM console log level from mainboard
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cpu/x86/smm: Enable setting SMM console log level from mainboard

Add a Kconfig RUNTIME_CONFIGURABLE_SMM_LOGLEVEL that enables
mainboard to override mainboard_set_smm_log_level for SMM log level.
This can let SMM have different log level than other stages for
more flexibility.

Another reason is that getting certain data that requires searching
from flash VPD or CMOS is not very ideal to be done in SMM, so in this
change the value can be passed via the member variable in struct
smm_runtime and be referenced directly in SMM.

One example is that mainboard can get the desired SMM log level from
VPD/CMOS, and pass SMM console log level via the variable and in SMM
it can be referenced in get_console_loglevel() override function
directly.

Tested=On OCP Delta Lake, verified SMM log level can be overridden.

Change-Id: I81722a4f1bf75ec942cc06e403ad702dfe938e71
Signed-off-by: Johnny Lin 
---
M src/cpu/x86/Kconfig
M src/cpu/x86/smm/smm_module_handler.c
M src/cpu/x86/smm/smm_module_loader.c
M src/include/cpu/x86/smm.h
4 files changed, 53 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/60/49460/28