From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Zhenyu Ye Subject: [RFC PATCH v3 1/2] arm64: tlb: Detect the ARMv8.4 TLBI RANGE feature Date: Tue, 14 Apr 2020 19:28:34 +0800 Message-ID: <20200414112835.1121-2-yezhenyu2@huawei.com> In-Reply-To: <20200414112835.1121-1-yezhenyu2@huawei.com> References: <20200414112835.1121-1-yezhenyu2@huawei.com> MIME-Version: 1.0 Content-Type: text/plain Content-Transfer-Encoding: quoted-printable Sender: owner-linux-mm@kvack.org To: will@kernel.org, catalin.marinas@arm.com, suzuki.poulose@arm.com, maz@kernel.org, steven.price@arm.com, guohanjun@huawei.com, olof@lixom.net Cc: yezhenyu2@huawei.com, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org, linux-mm@kvack.org, arm@kernel.org, xiexiangyou@huawei.com, prime.zeng@hisilicon.com, zhangshaokun@hisilicon.com, kuhn.chenqun@huawei.com List-ID: Message-ID: <20200414112834.oK9gRA7yz2uQeczvkAt1zyLeufRQtB-FKRNdcvfdS1Q@z> ARMv8.4-TLBI provides TLBI invalidation instruction that apply to a range of input addresses. This patch detect this feature. Signed-off-by: Zhenyu Ye --- arch/arm64/include/asm/cpucaps.h | 3 ++- arch/arm64/include/asm/sysreg.h | 4 ++++ arch/arm64/kernel/cpufeature.c | 11 +++++++++++ 3 files changed, 17 insertions(+), 1 deletion(-) diff --git a/arch/arm64/include/asm/cpucaps.h b/arch/arm64/include/asm/cp= ucaps.h index 8eb5a088ae65..950095a72617 100644 --- a/arch/arm64/include/asm/cpucaps.h +++ b/arch/arm64/include/asm/cpucaps.h @@ -61,7 +61,8 @@ #define ARM64_HAS_AMU_EXTN 51 #define ARM64_HAS_ADDRESS_AUTH 52 #define ARM64_HAS_GENERIC_AUTH 53 +#define ARM64_HAS_TLBI_RANGE 54 =20 -#define ARM64_NCAPS 54 +#define ARM64_NCAPS 55 =20 #endif /* __ASM_CPUCAPS_H */ diff --git a/arch/arm64/include/asm/sysreg.h b/arch/arm64/include/asm/sys= reg.h index ebc622432831..ac1b98650234 100644 --- a/arch/arm64/include/asm/sysreg.h +++ b/arch/arm64/include/asm/sysreg.h @@ -592,6 +592,7 @@ =20 /* id_aa64isar0 */ #define ID_AA64ISAR0_RNDR_SHIFT 60 +#define ID_AA64ISAR0_TLBI_RANGE_SHIFT 56 #define ID_AA64ISAR0_TS_SHIFT 52 #define ID_AA64ISAR0_FHM_SHIFT 48 #define ID_AA64ISAR0_DP_SHIFT 44 @@ -605,6 +606,9 @@ #define ID_AA64ISAR0_SHA1_SHIFT 8 #define ID_AA64ISAR0_AES_SHIFT 4 =20 +#define ID_AA64ISAR0_TLBI_RANGE_NI 0x0 +#define ID_AA64ISAR0_TLBI_RANGE 0x2 + /* id_aa64isar1 */ #define ID_AA64ISAR1_I8MM_SHIFT 52 #define ID_AA64ISAR1_DGH_SHIFT 48 diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeatur= e.c index 9fac745aa7bb..31bcfd0722b5 100644 --- a/arch/arm64/kernel/cpufeature.c +++ b/arch/arm64/kernel/cpufeature.c @@ -124,6 +124,7 @@ static bool __system_matches_cap(unsigned int n); */ static const struct arm64_ftr_bits ftr_id_aa64isar0[] =3D { ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR0_RN= DR_SHIFT, 4, 0), + ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR0_TL= BI_RANGE_SHIFT, 4, 0), ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR0_TS= _SHIFT, 4, 0), ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR0_FH= M_SHIFT, 4, 0), ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR0_DP= _SHIFT, 4, 0), @@ -1779,6 +1780,16 @@ static const struct arm64_cpu_capabilities arm64_f= eatures[] =3D { .min_field_value =3D 1, }, #endif + { + .desc =3D "TLB range maintenance instruction", + .capability =3D ARM64_HAS_TLBI_RANGE, + .type =3D ARM64_CPUCAP_SYSTEM_FEATURE, + .matches =3D has_cpuid_feature, + .sys_reg =3D SYS_ID_AA64ISAR0_EL1, + .field_pos =3D ID_AA64ISAR0_TLBI_RANGE_SHIFT, + .sign =3D FTR_UNSIGNED, + .min_field_value =3D ID_AA64ISAR0_TLBI_RANGE, + }, {}, }; =20 --=20 2.19.1