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arm64: cpufeature: Detect BBML3 based on ID_AA64MMFR2_EL1.BBM

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Add ID_AA64MMFR2_EL1.BBM based BBML3 feature detection in
cpu_supports_bbml3() so that cpus with the feature would
not have to be added into MIDR based supports_bbml3_list.

Reviewed-by: Gavin Shan <gshan@redhat.com>
Reviewed-by: Anshuman Khandual <anshuman.khandual@arm.com>
Signed-off-by: Linu Cherian <linu.cherian@arm.com>
[will: Tidy up cpu_supports_bbml3()]
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Linu Cherian
2026-07-23 10:10:33 +05:30
committed by Will Deacon
parent 94104e3cfa
commit 879aca5119
1 changed files with 4 additions and 8 deletions
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12
arch/arm64/kernel/cpufeature.c
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@@ -2153,16 +2153,12 @@ bool cpu_supports_bbml3(void)
MIDR_RANGE(MIDR_C1_PREMIUM, 1, 1, 0xf, 0xf),
{}
};
u64 mmfr2 = __read_sysreg_by_encoding(SYS_ID_AA64MMFR2_EL1);
if (!is_midr_in_range_list(supports_bbml3_list))
return false;
if (SYS_FIELD_GET(ID_AA64MMFR2_EL1, BBM, mmfr2) >= ID_AA64MMFR2_EL1_BBM_3)
return true;
/*
* We currently ignore the ID_AA64MMFR2_EL1 register, and only care
* about whether the MIDR check passes.
*/
return true;
return is_midr_in_range_list(supports_bbml3_list);
}
static bool has_bbml3(const struct arm64_cpu_capabilities *caps, int scope)