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 7048CC07E98 for ; Wed, 29 Nov 2023 05:29:57 +0000 (UTC) Authentication-Results: lists.ozlabs.org; dkim=fail reason="signature verification failed" (2048-bit key; unprotected) header.d=ellerman.id.au header.i=@ellerman.id.au header.a=rsa-sha256 header.s=201909 header.b=VHRce5Yd; dkim-atps=neutral Received: from boromir.ozlabs.org (localhost [IPv6:::1]) by lists.ozlabs.org (Postfix) with ESMTP id 4Sg7Dz65Jnz3cfQ for ; Wed, 29 Nov 2023 16:29:55 +1100 (AEDT) Authentication-Results: lists.ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=ellerman.id.au header.i=@ellerman.id.au header.a=rsa-sha256 header.s=201909 header.b=VHRce5Yd; dkim-atps=neutral Received: from gandalf.ozlabs.org (gandalf.ozlabs.org [150.107.74.76]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 4Sg7D00Wk9z30MQ for ; Wed, 29 Nov 2023 16:29:04 +1100 (AEDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ellerman.id.au; s=201909; t=1701235743; bh=GFT7EAkVpEquWEJU6kXdzQ2WWWjUfAfDnDgiMdjjeQ0=; h=From:To:Cc:Subject:In-Reply-To:References:Date:From; b=VHRce5Yd2nHOqIegCPxwoQ5yPwiG4xdQX1p7X5l43N9KxbNOnaesBwvs5SIN2D5Qq xUQm1SRPSqpEKXwQ1WyogPbdNZ4UWX4A4I+b5Kdqf8TLgAvS3Fx3xf5lKvFq3cvMay kXHv1FaMOnSv8RmXb/GbQVMrKhqsZx/RkMUmRZViv7K/gEco/cWA4lldpyaD5U0ZoV X4yk3Z1cMsmGYULy42scb/DriRqDNhgG6ef5ZzChaQ1BT4iv1zHmxA+oGSDVAIsVEC Nrn307lKTkGIDfzwG1L/SSPPzJAtFD3x1Qt1XOm13iFsJ20rxHL0pg57rTC+/VEGzL TMmRu80pHLdGw== Received: from authenticated.ozlabs.org (localhost [127.0.0.1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by mail.ozlabs.org (Postfix) with ESMTPSA id 4Sg7Cx6LhMz4xQZ; Wed, 29 Nov 2023 16:29:01 +1100 (AEDT) From: Michael Ellerman To: Zhao Ke =?utf-8?B?6LW1IOWPrw==?= , npiggin@gmail.com, christophe.leroy@csgroup.eu, fbarrat@linux.ibm.com, ajd@linux.ibm.com, arnd@arndb.de, gregkh@linuxfoundation.org Subject: Re: [PATCH] powerpc: Add PVN support for HeXin C2000 processor In-Reply-To: <52743BC52E07B486+dcb66331-0993-462b-ac03-6de69a3e1fac@shingroup.cn> References: <20231117075215.647-1-ke.zhao@shingroup.cn> <87sf4yk19w.fsf@mail.lhotse> <52743BC52E07B486+dcb66331-0993-462b-ac03-6de69a3e1fac@shingroup.cn> Date: Wed, 29 Nov 2023 16:28:56 +1100 Message-ID: <878r6h2kmf.fsf@mail.lhotse> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable 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: luming.yu@shingroup.cn, kvm@vger.kernel.org, dawei.li@shingroup.cn, linux-kernel@vger.kernel.org, shenghui.qu@shingroup.cn, linuxppc-dev@lists.ozlabs.org Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" Zhao Ke =E8=B5=B5 =E5=8F=AF writes: > On 2023/11/22 9:46, Michael Ellerman wrote: >> Zhao Ke writes: >>> HeXin Tech Co. has applied for a new PVN from the OpenPower Community >>> for its new processor C2000. The OpenPower has assigned a new PVN >>> and this newly assigned PVN is 0x0066, add pvr register related >>> support for this PVN. >>> >>> Signed-off-by: Zhao Ke >>> Link: https://discuss.openpower.foundation/t/how-to-get-a-new-pvr-for-p= rocessors-follow-power-isa/477/10 >>=20=20=20 >> Hi Zhao Ke, >> >> Thanks for the patch. Just a few questions. >> >> Are you able to provide any further detail on the processor? >> >> Your cputable entry claims that it's identical to the original Power8 >> core, can you comment at all on how true that is in practice? > > Basically, we made lots of design change for the new processor. > > For example: > > =C2=A0=C2=A0=C2=A0 1. redesign the interconnect of the fabric, from cros= sbar to mesh > > =C2=A0=C2=A0=C2=A0 2. redesign the memory subsystem, including the modif= ication of L2=20 > and L3 architecture > > =C2=A0=C2=A0=C2=A0 3. redesign the SMP bus > > =C2=A0=C2=A0=C2=A0 4. upgrade PCIe to gen5 and increase the number of la= nes > > =C2=A0=C2=A0=C2=A0 5. upgrade ddr to DDR5, dimm direct connected, and th= e number of=20 > channels > > =C2=A0=C2=A0=C2=A0 6. redesign the pervasive architecture, including deb= ug/trace,=20 > clock&power management, etc. OK thanks for the detail. Given all those changes I think you should not use "Power8" as the CPU name. Whatever the lineage of the core design is, it's no longer a literal "Power8", not even the same design using a different process node. So I think you should call it "HeXin C2000" or similar. cheers