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Thu, 23 Sep 2021 06:38:06 -0400 Received: from mail-wr1-x42a.google.com (mail-wr1-x42a.google.com [IPv6:2a00:1450:4864:20::42a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B253CC061574 for ; Thu, 23 Sep 2021 03:36:34 -0700 (PDT) Received: by mail-wr1-x42a.google.com with SMTP id t28so2415173wra.7 for ; Thu, 23 Sep 2021 03:36:34 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=brainfault-org.20210112.gappssmtp.com; s=20210112; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc:content-transfer-encoding; bh=eMbiNurWfkJzojRgNNmqasqLNlJJs+jiiHsMdIwNVvs=; b=Mwn70RgnJsBKz3l3RmCUghBXc3LumiQmyrULnyQImLHG6yGPcLa87NYIu4vIKWpj+7 HsmQt7OdQYRxnEZ7kD2gRlNXluGZtgsrFEtw24Cwh+mPOI9x9yKQPBAOU51SdlIKO8gV ms0imbOC38OgFS5Zir7zmafkscVxQqhxU5+r3RfAEkAh8DoslDTS2+te9bYpkJejTDr6 Ta5NyqItGdg7krlS/sv6L4Vz4Ne+JFElZQUd+X+ZKbSF5GcmfoKvbgccKi5DxLF0ChtO Nq8UNXm4FEDGsxZKKhIIrH1YSmtmlAzfG83PlAvIBCzWFuGCR9x2xPnSkFoicK46yijm ewtg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc:content-transfer-encoding; bh=eMbiNurWfkJzojRgNNmqasqLNlJJs+jiiHsMdIwNVvs=; b=TLhQnMgz3kOpg0XEQLDFsvaXl7Zyj/2xqrbs0/qI1hKukhSmo8RU25CgSn1C+8hSLz SdVxmV3c1TDYaJFQlvPgQMrLR7EIe39aEXy+2rL7Br8jcLnA5FLFJ3Lm6+a7gdN55rZb 92TKt49bZ56xZi/R195vCRqteqqATpSn3tFKGKEn/8CGBPm4a+Cm1oiqfl/Y1nrw8I/L EFahaYNVKzJcibaOtmWkz2RXLtjHAmyYugDI0DO0q3JkwKnb30ftg6LfdxO64u6jnIcO XsxhJhgWLvV7VBzk4EO62azTMFjhOGJNWCIweuKcZ9RuY36OmpVgQVtOZNeZlbMaZOU5 nwCg== X-Gm-Message-State: AOAM532ZhiBAmfJH15eC86rC/h+CbA3YM4WDa4d8vNxWBrrhT6ZL3m9j xP/HoEuXIRElL/wiN3PhJ3eAX65G4i2a5VqxJDaAxIzMSq2FKg== X-Google-Smtp-Source: ABdhPJzzzFNBBTQmornwaObih+0At8/n2L7giwGym3fL/FkOZkJtM7I96eIKvv/VP5+qdPQ2rdvgL3j+CZLbStAfjJE= X-Received: by 2002:a5d:688a:: with SMTP id h10mr4146098wru.331.1632393392871; Thu, 23 Sep 2021 03:36:32 -0700 (PDT) MIME-Version: 1.0 References: <20210923072716.913826-1-guoren@kernel.org> <6d7b1668c1f562a5ef426bb2519f9784@mailhost.ics.forth.gr> <0861cc74d3886e685e9aa5d13ddcd781@mailhost.ics.forth.gr> <16de95480d279b086cf0c612461e4235@mailhost.ics.forth.gr> In-Reply-To: From: Anup Patel Date: Thu, 23 Sep 2021 16:06:21 +0530 Message-ID: Subject: Re: [PATCH] riscv: Add RISC-V svpbmt extension To: Philipp Tomsich Cc: Nick Kossifidis , Guo Ren , Anup Patel , Atish Patra , Palmer Dabbelt , =?UTF-8?Q?Christoph_M=C3=BCllner?= , Christoph Hellwig , liush , wefu@redhat.com, =?UTF-8?B?V2VpIFd1ICjlkLTkvJ8p?= , 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 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Sep 23, 2021 at 3:38 PM Philipp Tomsich wrote: > > On Thu, 23 Sept 2021 at 11:48, Nick Kossifidis wrote: > > > > =CE=A3=CF=84=CE=B9=CF=82 2021-09-23 12:42, Nick Kossifidis =CE=AD=CE=B3= =CF=81=CE=B1=CF=88=CE=B5: > > > =CE=A3=CF=84=CE=B9=CF=82 2021-09-23 12:37, Anup Patel =CE=AD=CE=B3=CF= =81=CE=B1=CF=88=CE=B5: > > >> On Thu, Sep 23, 2021 at 2:55 PM Nick Kossifidis > > >> wrote: > > >>> > > >>> Hello Guo, > > >>> > > >>> =CE=A3=CF=84=CE=B9=CF=82 2021-09-23 10:27, guoren@kernel.org =CE=AD= =CE=B3=CF=81=CE=B1=CF=88=CE=B5: > > >>> 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. > > How if we expand this to a mmu subnode in cpu@x and add a booleans for > adornments like svnapot and svpbmt? > > The older mmu-type could then treated to indicate a mmu w/o any adornment= s > specified. I am aware that this generates an additional parsing-path > that will be > maintained, but it will allow future properties to be grouped. > > This could like like the following: > > cpu@0 { > ... > mmu { > type =3D "riscv,sv39"; > supports-svpbmt; > } > ... > } This is better but we will have to support the old "mmu-type" DT property as well because we can't break compatibility in DT bindings. 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a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc:content-transfer-encoding; bh=eMbiNurWfkJzojRgNNmqasqLNlJJs+jiiHsMdIwNVvs=; b=ED5KR97qZ4IecMZUtJlyMd8NDKwcPOESkCXGyj3MH+qYOqroLDm2O0g8oLdizn4uk5 BzgbRSm6fCkWVQ+g6mS9DbyxE484SYAKekjUqHxvXwocLN6eLr5wn9c3SUKNfal+8Wdz gJsV9i2dzDrOAh1ovQtytC7kOl4LgQdhQXCGSXutC2GkPYbmynruGpKYpUnFfJe9yd1i F6l74PWaR9MCzbr6XxDlAGlFtsJQkDAyrER4FEx2hY3rsQYO1X8bDFilGAsmRVGr0bSp oWX2RxS25qd0K5vQXrMGa234m2L4DM43QaUs33AsrE4gsoPAEdS0mbcTFywpY4mNTj5S r9FQ== X-Gm-Message-State: AOAM533fPpEMLcpp8YbNqMcuz4r1lpWt0H2n1lmeW+cPn/OPRXH1bjGb QHPvbO8ZRGKFL3TywOv5zdipihgP/6GfsvqO61CtaQ== X-Google-Smtp-Source: ABdhPJzzzFNBBTQmornwaObih+0At8/n2L7giwGym3fL/FkOZkJtM7I96eIKvv/VP5+qdPQ2rdvgL3j+CZLbStAfjJE= X-Received: by 2002:a5d:688a:: with SMTP id h10mr4146098wru.331.1632393392871; Thu, 23 Sep 2021 03:36:32 -0700 (PDT) MIME-Version: 1.0 References: <20210923072716.913826-1-guoren@kernel.org> <6d7b1668c1f562a5ef426bb2519f9784@mailhost.ics.forth.gr> <0861cc74d3886e685e9aa5d13ddcd781@mailhost.ics.forth.gr> <16de95480d279b086cf0c612461e4235@mailhost.ics.forth.gr> In-Reply-To: From: Anup Patel Date: Thu, 23 Sep 2021 16:06:21 +0530 Message-ID: Subject: Re: [PATCH] riscv: Add RISC-V svpbmt extension To: Philipp Tomsich Cc: Nick Kossifidis , Guo Ren , Anup Patel , Atish Patra , Palmer Dabbelt , =?UTF-8?Q?Christoph_M=C3=BCllner?= , Christoph Hellwig , liush , wefu@redhat.com, =?UTF-8?B?V2VpIFd1ICjlkLTkvJ8p?= , 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 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210923_033634_961330_E5884075 X-CRM114-Status: GOOD ( 27.76 ) 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-Type: text/plain; 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