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Mon, 25 May 2020 19:39:50 -0700 (PDT) Received: from [10.163.76.123] (unknown [10.163.76.123]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 3712B3F52E; Mon, 25 May 2020 19:39:42 -0700 (PDT) Subject: Re: [PATCH v3 1/6] arm64: Detect the ARMv8.4 TTL feature To: Zhenyu Ye , catalin.marinas@arm.com, peterz@infradead.org, mark.rutland@arm.com, will@kernel.org, aneesh.kumar@linux.ibm.com, akpm@linux-foundation.org, npiggin@gmail.com, arnd@arndb.de, rostedt@goodmis.org, maz@kernel.org, suzuki.poulose@arm.com, tglx@linutronix.de, yuzhao@google.com, Dave.Martin@arm.com, steven.price@arm.com, broonie@kernel.org, guohanjun@huawei.com Cc: 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 References: <20200525125300.794-1-yezhenyu2@huawei.com> <20200525125300.794-2-yezhenyu2@huawei.com> From: Anshuman Khandual Message-ID: Date: Tue, 26 May 2020 08:09:03 +0530 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1 MIME-Version: 1.0 In-Reply-To: <20200525125300.794-2-yezhenyu2@huawei.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Hello Zhenyu, On 05/25/2020 06:22 PM, Zhenyu Ye wrote: > diff --git a/arch/arm64/include/asm/sysreg.h b/arch/arm64/include/asm/sysreg.h > index c4ac0ac25a00..477d84ba1056 100644 > --- a/arch/arm64/include/asm/sysreg.h > +++ b/arch/arm64/include/asm/sysreg.h > @@ -725,6 +725,7 @@ > > /* id_aa64mmfr2 */ > #define ID_AA64MMFR2_E0PD_SHIFT 60 > +#define ID_AA64MMFR2_TTL_SHIFT 48 > #define ID_AA64MMFR2_FWB_SHIFT 40 > #define ID_AA64MMFR2_AT_SHIFT 32 > #define ID_AA64MMFR2_LVA_SHIFT 16 > diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c > index 9fac745aa7bb..d993dc6dc7d5 100644 > --- a/arch/arm64/kernel/cpufeature.c > +++ b/arch/arm64/kernel/cpufeature.c > @@ -244,6 +244,7 @@ static const struct arm64_ftr_bits ftr_id_aa64mmfr1[] = { > > static const struct arm64_ftr_bits ftr_id_aa64mmfr2[] = { > ARM64_FTR_BITS(FTR_HIDDEN, FTR_NONSTRICT, FTR_LOWER_SAFE, ID_AA64MMFR2_E0PD_SHIFT, 4, 0), > + ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR2_TTL_SHIFT, 4, 0), > ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR2_FWB_SHIFT, 4, 0), > ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR2_AT_SHIFT, 4, 0), > ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64MMFR2_LVA_SHIFT, 4, 0), > @@ -1622,6 +1623,16 @@ static const struct arm64_cpu_capabilities arm64_features[] = { > .matches = has_cpuid_feature, > .cpu_enable = cpu_has_fwb, > }, This patch (https://patchwork.kernel.org/patch/11557359/) is adding some more ID_AA64MMFR2 features including the TTL. I am going to respin parts of the V4 series patches along with the above mentioned patch. So please rebase this series accordingly, probably on latest next. - Anshuman