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BACKPORT: arm64: cpufeature: introduce helper cpu_has_hw_af()

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We unconditionally set the HW_AFDBM capability and only enable it on
CPUs which really have the feature. But sometimes we need to know
whether this cpu has the capability of HW AF. So decouple AF from
DBM by a new helper cpu_has_hw_af().

If later we noticed a potential performance issue on this path, we can
turn it into a static label as with other CPU features.
Moto-CRs-Fixed:(CR)

Link: https://lore.kernel.org/r/20191011140939.6115-2-justin.he@arm.com/
Change-Id: Ifed339bfe6c86ada6e45eddefa6aa010a7fe465d
Signed-off-by: Jia He <justin.he@arm.com>
Suggested-by: Suzuki Poulose <Suzuki.Poulose@arm.com>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
(cherry picked from commit 47d7b15b88f96a90694cfc607d0717d62dff6c45)
Bug: 261052246
Signed-off-by: Kalesh Singh <kaleshsingh@google.com>
Reviewed-on: https://gerrit.mot.com/2491776
SME-Granted: SME Approvals Granted
SLTApproved: Slta Waiver
Tested-by: Jira Key
Reviewed-by: Xiangpo Zhao <zhaoxp3@motorola.com>
Submit-Approved: Jira Key
This commit is contained in:
Jia He 2019-10-11 22:09:36 +08:00 • committed by Xiaojun Ji
commit 5d7abefcf8
1 changed files with 13 additions and 0 deletions
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13
arch/arm64/include/asm/cpufeature.h
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@ -707,6 +707,19 @@ static inline u32 id_aa64mmfr0_parange_to_phys_shift(int parange)
extern bool cpu_has_amu_feat(int cpu);
#endif
/* Check whether hardware update of the Access flag is supported */
static inline bool cpu_has_hw_af(void)
{
u64 mmfr1;
if (!IS_ENABLED(CONFIG_ARM64_HW_AFDBM))
return false;
mmfr1 = read_cpuid(ID_AA64MMFR1_EL1);
return cpuid_feature_extract_unsigned_field(mmfr1,
ID_AA64MMFR1_HADBS_SHIFT);
}
#endif /* __ASSEMBLY__ */
#endif