tree da80772432df44c8d4a978957086bffb0518cfdc
parent 16ab9bdcd578612bb3822373547f939eb90afd82
author Subrata Banik <subrata.banik@intel.com> 1627646078 +0530
committer Subrata Banik <subrata.banik@intel.com> 1629010716 +0000

soc/intel/common: Calculate and configure SF Mask 1

MSR IA_SF_QOS_INFO (0xc87) has been introduced since TGL and is used
to find out the NUM_SNOOP_FILTER_WAYS. Bit[5:0] of MSR 0xc87 indicates
the maximum number of bits that may be set in any of the SF MASK
register. Hence, this patch calculates SF way count using below logic:

Calculate SF masks 1:

1. Calculate SFWayCnt = (MSR 0xC87) & 0x3f

2. if CONFIG_SF_MASK_2WAYS_PER_BIT:
	a. SFWayCnt = SFWayCnt / 2

3. Set SF_MASK_1 = ((1 << SFWayCnt) - 1) - SF_MASK_2

Change-Id: Ifd0b7e1a90cad4a4837adf6067fe8301dcd0a941
Signed-off-by: Subrata Banik <subrata.banik@intel.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/51374
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>