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 Received: from lists.ozlabs.org (lists.ozlabs.org [112.213.38.117]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 13FD4C3DA59 for ; Mon, 15 Jul 2024 09:27:10 +0000 (UTC) Received: from boromir.ozlabs.org (localhost [IPv6:::1]) by lists.ozlabs.org (Postfix) with ESMTP id 4WMxg05jXpz3cXP for ; Mon, 15 Jul 2024 19:27:08 +1000 (AEST) Authentication-Results: lists.ozlabs.org; dmarc=pass (p=none dis=none) header.from=arm.com Authentication-Results: lists.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=arm.com (client-ip=217.140.110.172; helo=foss.arm.com; envelope-from=anshuman.khandual@arm.com; receiver=lists.ozlabs.org) Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by lists.ozlabs.org (Postfix) with ESMTP id 4WMxfZ3WlMz2yvx for ; Mon, 15 Jul 2024 19:26:45 +1000 (AEST) 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 ED58ADA7; Mon, 15 Jul 2024 02:26:39 -0700 (PDT) Received: from [10.162.40.16] (a077893.blr.arm.com [10.162.40.16]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 7B89E3F73F; Mon, 15 Jul 2024 02:26:06 -0700 (PDT) Message-ID: <1da79356-4cf7-476f-bd16-61123e39598a@arm.com> Date: Mon, 15 Jul 2024 14:56:03 +0530 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v4 12/29] arm64: add POIndex defines To: Joey Gouly , linux-arm-kernel@lists.infradead.org References: <20240503130147.1154804-1-joey.gouly@arm.com> <20240503130147.1154804-13-joey.gouly@arm.com> Content-Language: en-US From: Anshuman Khandual In-Reply-To: <20240503130147.1154804-13-joey.gouly@arm.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: szabolcs.nagy@arm.com, catalin.marinas@arm.com, dave.hansen@linux.intel.com, linux-mm@kvack.org, hpa@zytor.com, shuah@kernel.org, maz@kernel.org, x86@kernel.org, christophe.leroy@csgroup.eu, aneesh.kumar@kernel.org, mingo@redhat.com, naveen.n.rao@linux.ibm.com, will@kernel.org, npiggin@gmail.com, broonie@kernel.org, bp@alien8.de, kvmarm@lists.linux.dev, tglx@linutronix.de, oliver.upton@linux.dev, aneesh.kumar@linux.ibm.com, linux-fsdevel@vger.kernel.org, akpm@linux-foundation.org, linuxppc-dev@lists.ozlabs.org Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" On 5/3/24 18:31, Joey Gouly wrote: > The 3-bit POIndex is stored in the PTE at bits 60..62. > > Signed-off-by: Joey Gouly > Cc: Catalin Marinas > Cc: Will Deacon > --- > arch/arm64/include/asm/pgtable-hwdef.h | 10 ++++++++++ > 1 file changed, 10 insertions(+) > > diff --git a/arch/arm64/include/asm/pgtable-hwdef.h b/arch/arm64/include/asm/pgtable-hwdef.h > index ef207a0d4f0d..370a02922fe1 100644 > --- a/arch/arm64/include/asm/pgtable-hwdef.h > +++ b/arch/arm64/include/asm/pgtable-hwdef.h > @@ -198,6 +198,16 @@ > #define PTE_PI_IDX_2 53 /* PXN */ > #define PTE_PI_IDX_3 54 /* UXN */ > > +/* > + * POIndex[2:0] encoding (Permission Overlay Extension) > + */ > +#define PTE_PO_IDX_0 (_AT(pteval_t, 1) << 60) > +#define PTE_PO_IDX_1 (_AT(pteval_t, 1) << 61) > +#define PTE_PO_IDX_2 (_AT(pteval_t, 1) << 62) > + > +#define PTE_PO_IDX_MASK GENMASK_ULL(62, 60) > + > + > /* > * Memory Attribute override for Stage-2 (MemAttr[3:0]) > */ Could this patch be folded with a later patch that uses the above indices and the mask for the first time.