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cpu/intel/microcode: Have provision to re-load microcode patch 

This patch provides an option to reload the microcode patch a.k.a
second microcode patch if SoC selects the required
RELOAD_MICROCODE_PATCH config.

There is a new feature requirement starting with ADL to re-load the
microcode patch as per new Mcheck initialization flow.

BUG=b:233199592
TEST=Build and boot google/taeko to ChromeOS. Able to re-load
microcode patch as below:

[INFO ]  microcode: Re-load microcode patch
[INFO ]  microcode: updated to revision 0x41b date=2022-03-08

Signed-off-by: Subrata Banik <subratabanik@google.com>
Change-Id: I0a3c29b3c25fccd31280a2a5a8d4fb22a6cf53bf
Reviewed-on: https://review.coreboot.org/c/coreboot/+/64833
Reviewed-by: Eric Lai <eric_lai@quanta.corp-partner.google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Tarun Tuli <taruntuli@google.com>
This commit is contained in:
Subrata Banik 2022-05-31 21:34:53 +05:30 committed by Felix Held
parent bdea3524b0
commit 0310d34c2f
2 changed files with 17 additions and 2 deletions
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10
src/cpu/intel/microcode/Kconfig
View File

@ -5,3 +5,13 @@ config MICROCODE_UPDATE_PRE_RAM
help help
Select this option if you want to update the microcode Select this option if you want to update the microcode
during the cache as RAM setup. during the cache as RAM setup.
config RELOAD_MICROCODE_PATCH
bool
default n
help
Select this option if SoC recommends to re-load microcode
patch as part of CPU multiprocessor initialization process.
This feature is mostly required with Intel latest generation
processors starting with Alder Lake (with modified MCHECK init
flow).

9
src/cpu/intel/microcode/microcode.c
View File

@ -79,10 +79,15 @@ void intel_microcode_load_unlocked(const void *microcode_patch)
current_rev = read_microcode_rev(); current_rev = read_microcode_rev();
/* No use loading the same revision. */ /*
if (current_rev == m->rev) { * No use loading the same revision unless RELOAD_MICROCODE_PATCH
* config is selected.
*/
if (!CONFIG(RELOAD_MICROCODE_PATCH) && (current_rev == m->rev)) {
printk(BIOS_INFO, "microcode: Update skipped, already up-to-date\n"); printk(BIOS_INFO, "microcode: Update skipped, already up-to-date\n");
return; return;
} else {
printk(BIOS_INFO, "microcode: Re-load microcode patch\n");
} }
#if ENV_RAMSTAGE #if ENV_RAMSTAGE