Commit 0061aa1a authored by Wang ShaoBo's avatar Wang ShaoBo Committed by Zeng Heng
Browse files

arm64/mpam: support MPAM v0.1 version 

hulk inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I92AK4
CVE: NA

-----------------------------

This supports MPAM v0.1 version for cpufeature detection, check [1] for details.

[1] https://developer.arm.com/documentation/ddi0595/2021-12/


AArch64-Registers/ID-AA64PFR1-EL1--AArch64-Processor-Feature-Register-1?lang=en

Signed-off-by: default avatarWang ShaoBo <bobo.shaobowang@huawei.com>
parent df46ea01

arch/arm64/kernel/cpufeature.c

+12 −6
Original line number Diff line number Diff line
@@ -1355,6 +1355,17 @@ static bool has_cache_idc(const struct arm64_cpu_capabilities *entry, 
	return ctr & BIT(CTR_IDC_SHIFT);

}



#ifdef CONFIG_MPAM

static bool has_mpam(const struct arm64_cpu_capabilities *entry, int __unused)

{

	u64 pfr0 = read_sanitised_ftr_reg(SYS_ID_AA64PFR0_EL1);

	u64 pfr1 = read_sanitised_ftr_reg(SYS_ID_AA64PFR1_EL1);



	return cpuid_feature_extract_unsigned_field(pfr0, ID_AA64PFR0_MPAM_SHIFT) |

		cpuid_feature_extract_unsigned_field(pfr1, ID_AA64PFR1_MPAMFRAC_SHIFT);

}

#endif



static void cpu_emulate_effective_ctr(const struct arm64_cpu_capabilities *__unused)

{

	/*
@@ -2320,12 +2331,7 @@ static const struct arm64_cpu_capabilities arm64_features[] = { 
		.desc = "ARM64 MPAM Extension Support",

		.capability = ARM64_HAS_MPAM,

		.type = ARM64_CPUCAP_SCOPE_SYSTEM,

		.matches = has_cpuid_feature,

		.sys_reg = SYS_ID_AA64PFR0_EL1,

		.sign = FTR_UNSIGNED,

		.field_pos = ID_AA64PFR0_MPAM_SHIFT,

		.field_width = 4,

		.min_field_value = ID_AA64PFR0_MPAM,

		.matches = has_mpam,

	},

#endif /* CONFIG_MPAM */

#ifdef CONFIG_ARM64_AMU_EXTN