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X-AuditID: 8b5b014d-ba8f670000005d46-5e-614c4d5edca6 Received: from enigma.ics.forth.gr (enigma.ics.forth.gr [139.91.151.35]) by av3.ics.forth.gr (Symantec Messaging Gateway) with SMTP id 20.1C.23878.E5D4C416; Thu, 23 Sep 2021 12:48:15 +0300 (EEST) X-ICS-AUTH-INFO: Authenticated user: at ics.forth.gr MIME-Version: 1.0 Date: Thu, 23 Sep 2021 12:48:13 +0300 From: Nick Kossifidis To: Nick Kossifidis Cc: Anup Patel , Guo Ren , Anup Patel , Atish Patra , Palmer Dabbelt , =?UTF-8?Q?Christoph_M=C3=BCllner?= , Philipp Tomsich , Christoph Hellwig , liush , wefu@redhat.com, =?UTF-8?Q?Wei_Wu_=28=E5=90=B4=E4=BC=9F=29?= , Drew Fustini , linux-riscv , "linux-kernel@vger.kernel.org List" , taiten.peng@canonical.com, aniket.ponkshe@canonical.com, Heinrich Schuchardt , gordan.markus@canonical.com, Guo Ren , Arnd Bergmann , Chen-Yu Tsai , Maxime Ripard , Daniel Lustig , Greg Favor , Andrea Mondelli , Jonathan Behrens , Xinhaoqu , Bill Huffman , Allen Baum , Josh Scheid , Richard Trauben Subject: Re: [PATCH] riscv: Add RISC-V svpbmt extension Organization: FORTH In-Reply-To: <0861cc74d3886e685e9aa5d13ddcd781@mailhost.ics.forth.gr> References: <20210923072716.913826-1-guoren@kernel.org> <6d7b1668c1f562a5ef426bb2519f9784@mailhost.ics.forth.gr> <0861cc74d3886e685e9aa5d13ddcd781@mailhost.ics.forth.gr> Message-ID: <16de95480d279b086cf0c612461e4235@mailhost.ics.forth.gr> X-Sender: mick@mailhost.ics.forth.gr User-Agent: Roundcube Webmail/1.3.16 X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFmplleLIzCtJLcpLzFFi42Lpjp6urBvv65NoMOsWi8WTQ+1sFtMOHGK3 aJ2wG8j9MJHNouXDO1aLv5OOsVssWvGdxWLJTmmLPa/2sFtcaO5htLi3Yhm7xe7+OSwW289/ Z7N4sbeRxeL4o10sFitXH2WyuNB4k93i8ur5TBbPTx1js7j05RqLxeVdc9gstn1uYbNYue4Y s8WMH/8YLZrfnWO32LpxHaNF98pqi5MbDjBarFk6ldGiZf8UFoufh84zWSx8PY/dQcHjVdsz Jo/fvyYxerz7vYzRY+rvMyweazpfM3nMauhl87hz7jybx4ZHq1k9/h9ayeKxc9Zddo8Fm0o9 Wo68ZfV4uOkSk8emVZ1sHjsfWnpsXlIfIBHFZZOSmpNZllqkb5fAlfH+J3fBM76KeUfOsjcw vubuYuTkkBAwkZi+qJGli5GLQ0jgKKPEm3sv2CESphKz93Yygti8AoISJ2c+YQGxmQUsJKZe 2c8IYctLNG+dzQxiswioSvz7eBisl01AU2L+pYNg9SIC6hKdz98wgixgFpjJLbHz/FewZmEB c4m3XxvAGvgFhCU+3b3ICmJzCrhKbJ3exghx0RdGiX0zT7JDXOEi8WT9bCaI61QkPvx+ABTn 4BAFsjfPVZrAKDgLya2zkNw6C8mtCxiZVzEKJJYZ62UmF+ul5ReVZOilF21iBKcURt8djLc3 v9U7xMjEwXiIUYKDWUmE9/MNr0Qh3pTEyqrUovz4otKc1OJDjNIcLErivLx6E+KFBNITS1Kz U1MLUotgskwcnFINTIoxbxTs1F/vquCMceK//yeO/3/Qg3X38jd/z9BM4TTWPpG50j1xkUY1 V9DP6M+Z+4p+fHb0Z83JeKXj57y3oHiR5dHU06riPz7pSh1LP7S27cSSyq9LKy0zAxj0e5w5 7ptKRDuz2uYLv7t0MXUfh9ILm2fdt3KNprS42224n5TwjT/dOE1/w+5sg6jDb1t9Aj1t5JNr VBPYtjxTr4n9pSyrcmXvbuGGVcyT3x1b6VigWqgst1CsozTZ/o91yLe3nw9JvK2+eYfpyKd9 n6yvyAe9aalIunpN+lmsmucdgz9Pg46/ULfKW2I1/ePzeRa3966ozVkvJVEn+Wd9ur1XxRd7 jhfmhw5GdIUW/HVRYinOSDTUYi4qTgQAqeAjvJgDAAA= X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210923_024822_668390_9B5E9B21 X-CRM114-Status: GOOD ( 11.22 ) X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Transfer-Encoding: base64 Content-Type: text/plain; charset="utf-8"; Format="flowed" Sender: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org zqPPhM65z4IgMjAyMS0wOS0yMyAxMjo0MiwgTmljayBLb3NzaWZpZGlzIM6tzrPPgc6xz4jOtToK PiDOo8+EzrnPgiAyMDIxLTA5LTIzIDEyOjM3LCBBbnVwIFBhdGVsIM6tzrPPgc6xz4jOtToKPj4g T24gVGh1LCBTZXAgMjMsIDIwMjEgYXQgMjo1NSBQTSBOaWNrIEtvc3NpZmlkaXMgPG1pY2tAaWNz LmZvcnRoLmdyPiAKPj4gd3JvdGU6Cj4+PiAKPj4+IEhlbGxvIEd1bywKPj4+IAo+Pj4gzqPPhM65 z4IgMjAyMS0wOS0yMyAxMDoyNywgZ3VvcmVuQGtlcm5lbC5vcmcgzq3Os8+BzrHPiM61Ogo+Pj4g ZGlmZiAtLWdpdCBhL0RvY3VtZW50YXRpb24vZGV2aWNldHJlZS9iaW5kaW5ncy9yaXNjdi9jcHVz LnlhbWwKPj4+IGIvRG9jdW1lbnRhdGlvbi9kZXZpY2V0cmVlL2JpbmRpbmdzL3Jpc2N2L2NwdXMu eWFtbAo+Pj4gaW5kZXggZTUzNGY2YTdjZmExLi4xODI1Y2Q4ZGIwZGUgMTAwNjQ0Cj4+PiAtLS0g YS9Eb2N1bWVudGF0aW9uL2RldmljZXRyZWUvYmluZGluZ3MvcmlzY3YvY3B1cy55YW1sCj4+PiAr KysgYi9Eb2N1bWVudGF0aW9uL2RldmljZXRyZWUvYmluZGluZ3MvcmlzY3YvY3B1cy55YW1sCj4+ PiBAQCAtNTYsNyArNTYsOSBAQCBwcm9wZXJ0aWVzOgo+Pj4gICAgICAgZW51bToKPj4+ICAgICAg ICAgLSByaXNjdixzdjMyCj4+PiAgICAgICAgIC0gcmlzY3Ysc3YzOQo+Pj4gKyAgICAgIC0gcmlz Y3Ysc3YzOSxzdnBibXQKPj4+ICAgICAgICAgLSByaXNjdixzdjQ4Cj4+PiArICAgICAgLSByaXNj dixzdjQ4LHN2cGJtdAo+Pj4gICAgICAgICAtIHJpc2N2LG5vbmUKPj4+IAo+Pj4gSXNuJ3Qgc3Zw Ym10IG9ydGhvZ29uYWwgdG8gdGhlIG1tdSB0eXBlID8gSXQncyBhIGZ1bmN0aW9uYWxpdHkgdGhh dCAKPj4+IGNhbgo+Pj4gYmUgcHJlc2VudCBvbiBlaXRoZXIgc3YzOS80OC81NyBzbyB3aHkgbm90 IGhhdmUgYW5vdGhlciAic3ZwYm10Igo+Pj4gcHJvcGVydHkgZGlyZWN0bHkgb24gdGhlIGNwdSBu b2RlID8KPj4gCj4+IEFjdHVhbGx5LCAibW11LXR5cGUiIHdvdWxkIGJlIGEgZ29vZCBwbGFjZSBi ZWNhdXNlIGl0J3MgcGFnZSBiYXNlZAo+PiBtZW1vcnkgYXR0cmlidXRlIGFuZCBwYWdpbmcgY2Fu J3QgZXhpc3Qgd2l0aG91dCBtbXUgdHJhbnNsYXRpb24gbW9kZS4KPj4gCj4+IEFsc28sICJzdnBt YnQiIGlzIGluZGVlZCBhIENQVSBwcm9wZXJ0eSBzbyBoYXMgdG8gYmUgZmVhdHVyZSAKPj4gaW5k aXZpZHVhbAo+PiBDUFUgbm9kZS4gSHlwb3RoZXRpY2FsbHksIGEgaGV0ZXJvZ2VuZW91cyBzeXN0 ZW0gaXMgcG9zc2libGUgd2hlcmUKPj4gc29tZSBDUFVzIGhhdmUgInN2cG1idCIgYW5kIHNvbWUg Q1BVcyBkb24ndCBoYXZlICJzdnBtYnQiLiBGb3IKPj4gZXhhbXBsZSwgYSBmdXR1cmUgRlV4eHgg U29DIG1pZ2h0IGhhdmUgYSBFLWNvcmUgYW5kIGZldyBTLWNvcmVzCj4+IHdoZXJlIFMtY29yZXMg aGF2ZSBTdnBtYnQgd2hlcmVhcyBFLWNvcmUgZG9lcyBub3QgaGF2ZSBTdnBtYnQKPj4gYmVjYXVz ZSBpdCdzIGFuIGVtYmVkZGVkIGNvcmUuCj4+IAo+IAo+IEkgc2hvdWxkIHNheSBjcHVYIG5vZGUs IG5vdCB0aGUgcm9vdCAvY3B1IG5vZGUuIFdlIGNhbiBoYXZlIGFuIHN2cGJtdAo+IHByb3BlcnR5 IGluIHRoZSBzYW1lIHdheSB3ZSBoYXZlIGFuIG1tdS10eXBlIHByb3BlcnR5Lgo+IAoKSSdtIGFs c28gdGhpbmtpbmcgb2YgZnV0dXJlIG1tdS1yZWxhdGVkIGV4dGVuc2lvbnMsIGUuZy4gd2hhdCBh Ym91dCAKc3ZuYXBvdCA/IFNob3VsZCB3ZSBoYXZlIG1tdS10eXBlIGJlIHJpc2N2LHN2Mzksc3Zu YXBvdCBhbmQgZS5nLiAKcmlzY3Yuc3YzOSxzdnBibXQsc3ZuYXBvdCA/IEl0J2xsIGJlY29tZSBt ZXNzeS4KClJlZ2FyZHMsCk5pY2sKCl9fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f X19fX19fX19fX19fCmxpbnV4LXJpc2N2IG1haWxpbmcgbGlzdApsaW51eC1yaXNjdkBsaXN0cy5p bmZyYWRlYWQub3JnCmh0dHA6Ly9saXN0cy5pbmZyYWRlYWQub3JnL21haWxtYW4vbGlzdGluZm8v bGludXgtcmlzY3YK 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=-8.6 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS 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 2A012C433F5 for ; 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bh=b40pxG74vSyzDsUyZQqj5rECdnyCEnKf/bmituQ7HGQ=; b=V0AwFjJwMt9ytoSGdr4fLFEfbQoduL+VS+PcwZA6BZE++rej7lwPTa2ujaSC6Ozp /gAfSYjSaEDWi5/XF0hVRH4bBxOh1UnWOoY+lCC9IDB6EZ/cQ77yVIbb1DD0PB9B IfSJqLXiZgTCv8VNB17ejkWcqNBirqWSR9MiTLsL5uULhKk2+01rxR6qxAFvwjnl 4H4VxP29tbvjOzgwEZTiCzovnNPDE3KQm90/S+WkWWi5DyZKd9SyIXoDmwoVWTw2 ZwyMKXEdsdMEacCrlRLqaxEkzQ/RZ59xxGPCqaedD22EvqELUgK7k2l354HB5op9 gX1JRoL0w2stoTiMblR6bw==; X-AuditID: 8b5b014d-ba8f670000005d46-5e-614c4d5edca6 Received: from enigma.ics.forth.gr (enigma.ics.forth.gr [139.91.151.35]) by av3.ics.forth.gr (Symantec Messaging Gateway) with SMTP id 20.1C.23878.E5D4C416; Thu, 23 Sep 2021 12:48:15 +0300 (EEST) X-ICS-AUTH-INFO: Authenticated user: at ics.forth.gr MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Date: Thu, 23 Sep 2021 12:48:13 +0300 From: Nick Kossifidis To: Nick Kossifidis Cc: Anup Patel , Guo Ren , Anup Patel , Atish Patra , Palmer Dabbelt , =?UTF-8?Q?Christoph_M=C3=BCllner?= , Philipp Tomsich , Christoph Hellwig , liush , wefu@redhat.com, =?UTF-8?Q?Wei_Wu_=28=E5=90=B4=E4=BC=9F=29?= , Drew Fustini , linux-riscv , "linux-kernel@vger.kernel.org List" , taiten.peng@canonical.com, aniket.ponkshe@canonical.com, Heinrich Schuchardt , gordan.markus@canonical.com, Guo Ren , Arnd Bergmann , Chen-Yu Tsai , Maxime Ripard , Daniel Lustig , Greg Favor , Andrea Mondelli , Jonathan Behrens , Xinhaoqu , Bill Huffman , Allen Baum , Josh Scheid , Richard Trauben Subject: Re: [PATCH] riscv: Add RISC-V svpbmt extension Organization: FORTH In-Reply-To: <0861cc74d3886e685e9aa5d13ddcd781@mailhost.ics.forth.gr> References: <20210923072716.913826-1-guoren@kernel.org> <6d7b1668c1f562a5ef426bb2519f9784@mailhost.ics.forth.gr> <0861cc74d3886e685e9aa5d13ddcd781@mailhost.ics.forth.gr> Message-ID: <16de95480d279b086cf0c612461e4235@mailhost.ics.forth.gr> X-Sender: mick@mailhost.ics.forth.gr User-Agent: Roundcube Webmail/1.3.16 X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFmplleLIzCtJLcpLzFFi42Lpjp6urBvv65NoMOsWi8WTQ+1sFtMOHGK3 aJ2wG8j9MJHNouXDO1aLv5OOsVssWvGdxWLJTmmLPa/2sFtcaO5htLi3Yhm7xe7+OSwW289/ Z7N4sbeRxeL4o10sFitXH2WyuNB4k93i8ur5TBbPTx1js7j05RqLxeVdc9gstn1uYbNYue4Y s8WMH/8YLZrfnWO32LpxHaNF98pqi5MbDjBarFk6ldGiZf8UFoufh84zWSx8PY/dQcHjVdsz Jo/fvyYxerz7vYzRY+rvMyweazpfM3nMauhl87hz7jybx4ZHq1k9/h9ayeKxc9Zddo8Fm0o9 Wo68ZfV4uOkSk8emVZ1sHjsfWnpsXlIfIBHFZZOSmpNZllqkb5fAlfH+J3fBM76KeUfOsjcw vubuYuTkkBAwkZi+qJGli5GLQ0jgKKPEm3sv2CESphKz93Yygti8AoISJ2c+YQGxmQUsJKZe 2c8IYctLNG+dzQxiswioSvz7eBisl01AU2L+pYNg9SIC6hKdz98wgixgFpjJLbHz/FewZmEB c4m3XxvAGvgFhCU+3b3ICmJzCrhKbJ3exghx0RdGiX0zT7JDXOEi8WT9bCaI61QkPvx+ABTn 4BAFsjfPVZrAKDgLya2zkNw6C8mtCxiZVzEKJJYZ62UmF+ul5ReVZOilF21iBKcURt8djLc3 v9U7xMjEwXiIUYKDWUmE9/MNr0Qh3pTEyqrUovz4otKc1OJDjNIcLErivLx6E+KFBNITS1Kz U1MLUotgskwcnFINTIoxbxTs1F/vquCMceK//yeO/3/Qg3X38jd/z9BM4TTWPpG50j1xkUY1 V9DP6M+Z+4p+fHb0Z83JeKXj57y3oHiR5dHU06riPz7pSh1LP7S27cSSyq9LKy0zAxj0e5w5 7ptKRDuz2uYLv7t0MXUfh9ILm2fdt3KNprS42224n5TwjT/dOE1/w+5sg6jDb1t9Aj1t5JNr VBPYtjxTr4n9pSyrcmXvbuGGVcyT3x1b6VigWqgst1CsozTZ/o91yLe3nw9JvK2+eYfpyKd9 n6yvyAe9aalIunpN+lmsmucdgz9Pg46/ULfKW2I1/ePzeRa3966ozVkvJVEn+Wd9ur1XxRd7 jhfmhw5GdIUW/HVRYinOSDTUYi4qTgQAqeAjvJgDAAA= Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Στις 2021-09-23 12:42, Nick Kossifidis έγραψε: > Στις 2021-09-23 12:37, Anup Patel έγραψε: >> On Thu, Sep 23, 2021 at 2:55 PM Nick Kossifidis >> wrote: >>> >>> Hello Guo, >>> >>> Στις 2021-09-23 10:27, guoren@kernel.org έγραψε: >>> diff --git a/Documentation/devicetree/bindings/riscv/cpus.yaml >>> b/Documentation/devicetree/bindings/riscv/cpus.yaml >>> index e534f6a7cfa1..1825cd8db0de 100644 >>> --- a/Documentation/devicetree/bindings/riscv/cpus.yaml >>> +++ b/Documentation/devicetree/bindings/riscv/cpus.yaml >>> @@ -56,7 +56,9 @@ properties: >>> enum: >>> - riscv,sv32 >>> - riscv,sv39 >>> + - riscv,sv39,svpbmt >>> - riscv,sv48 >>> + - riscv,sv48,svpbmt >>> - riscv,none >>> >>> Isn't svpbmt orthogonal to the mmu type ? It's a functionality that >>> can >>> be present on either sv39/48/57 so why not have another "svpbmt" >>> property directly on the cpu node ? >> >> Actually, "mmu-type" would be a good place because it's page based >> memory attribute and paging can't exist without mmu translation mode. >> >> Also, "svpmbt" is indeed a CPU property so has to be feature >> individual >> CPU node. Hypothetically, a heterogeneous system is possible where >> some CPUs have "svpmbt" and some CPUs don't have "svpmbt". For >> example, a future FUxxx SoC might have a E-core and few S-cores >> where S-cores have Svpmbt whereas E-core does not have Svpmbt >> because it's an embedded core. >> > > I should say cpuX node, not the root /cpu node. We can have an svpbmt > property in the same way we have an mmu-type property. > I'm also thinking of future mmu-related extensions, e.g. what about svnapot ? Should we have mmu-type be riscv,sv39,svnapot and e.g. riscv.sv39,svpbmt,svnapot ? It'll become messy. Regards, Nick