From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-8.2 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id BFAFCC47247 for ; Tue, 5 May 2020 04:49:56 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9C89D20721 for ; Tue, 5 May 2020 04:49:56 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726538AbgEEEtz (ORCPT ); Tue, 5 May 2020 00:49:55 -0400 Received: from foss.arm.com ([217.140.110.172]:59214 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725298AbgEEEtz (ORCPT ); Tue, 5 May 2020 00:49:55 -0400 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id AB06830E; Mon, 4 May 2020 21:49:54 -0700 (PDT) Received: from [10.37.12.10] (unknown [10.37.12.10]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 12E1B3F68F; Mon, 4 May 2020 21:49:49 -0700 (PDT) Subject: Re: [PATCH V3 09/16] arm64/cpufeature: Add remaining feature bits in ID_AA64ISAR0 register To: anshuman.khandual@arm.com, linux-arm-kernel@lists.infradead.org Cc: catalin.marinas@arm.com, will@kernel.org, mark.rutland@arm.com, linux-kernel@vger.kernel.org References: <1588426445-24344-1-git-send-email-anshuman.khandual@arm.com> <1588426445-24344-10-git-send-email-anshuman.khandual@arm.com> From: Suzuki K Poulose Message-ID: <0e5274dc-e2e3-646a-076b-ebe195048c5a@arm.com> Date: Tue, 5 May 2020 05:54:44 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.7.0 MIME-Version: 1.0 In-Reply-To: <1588426445-24344-10-git-send-email-anshuman.khandual@arm.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 05/02/2020 02:33 PM, Anshuman Khandual wrote: > Enable TLB features bit in ID_AA64ISAR0 register as per ARM DDI 0487F.a > specification. > > Cc: Catalin Marinas > Cc: Will Deacon > Cc: Mark Rutland > Cc: Suzuki K Poulose > Cc: linux-arm-kernel@lists.infradead.org > Cc: linux-kernel@vger.kernel.org > > Suggested-by: Will Deacon > Signed-off-by: Anshuman Khandual > --- > arch/arm64/include/asm/sysreg.h | 1 + > arch/arm64/kernel/cpufeature.c | 1 + > 2 files changed, 2 insertions(+) > > diff --git a/arch/arm64/include/asm/sysreg.h b/arch/arm64/include/asm/sysreg.h > index 0f34927f52b9..40eaf89f1032 100644 > --- a/arch/arm64/include/asm/sysreg.h > +++ b/arch/arm64/include/asm/sysreg.h > @@ -597,6 +597,7 @@ > > /* id_aa64isar0 */ > #define ID_AA64ISAR0_RNDR_SHIFT 60 > +#define ID_AA64ISAR0_TLB_SHIFT 56 > #define ID_AA64ISAR0_TS_SHIFT 52 > #define ID_AA64ISAR0_FHM_SHIFT 48 > #define ID_AA64ISAR0_DP_SHIFT 44 > diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c > index f4e15e355aee..dbedcae28061 100644 > --- a/arch/arm64/kernel/cpufeature.c > +++ b/arch/arm64/kernel/cpufeature.c > @@ -174,6 +174,7 @@ static bool __system_matches_cap(unsigned int n); > */ > static const struct arm64_ftr_bits ftr_id_aa64isar0[] = { > ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR0_RNDR_SHIFT, 4, 0), > + ARM64_FTR_BITS(FTR_VISIBLE, FTR_STRICT, FTR_LOWER_SAFE, ID_AA64ISAR0_TLB_SHIFT, 4, 0), I don't see any reason why this should be VISIBLE to the userspace. Suzuki