From patchwork Thu Nov 29 23:28:16 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Atish Patra X-Patchwork-Id: 10705531 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 0639A13A4 for ; Thu, 29 Nov 2018 23:28:49 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id E826B2F4EE for ; Thu, 29 Nov 2018 23:28:48 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id D871F2F3E8; Thu, 29 Nov 2018 23:28:48 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.0 required=2.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,MAILING_LIST_MULTI,RCVD_IN_DNSWL_MED autolearn=ham version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 71F3C2F3E8 for ; Thu, 29 Nov 2018 23:28:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:MIME-Version:Cc:List-Subscribe: List-Help:List-Post:List-Archive:List-Unsubscribe:List-Id:Message-Id:Date: Subject:To:From:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To: References:List-Owner; bh=uNbjiG8Nq/KfJ0wR46MP/kca9CqUdV9dB7PCc0Uw6CM=; b=QDy DPYV/f1FxG8P6st0AWGh1FfJaRXmutLsUDgJWwU2Brc3/wJaUOzR2xWoBqKeOJNXNtZEPO1fmQSnk bwNJP5pGx/nKS51Co4PyLVZpq00aZ05U+WJ/48NqgXE37CQrbWmeLYTAbQoO6IQbXnmYH45arhSAA smBVzhJ9deNF/4FVJXZujzaouhcN2kGsnuHA/DiwTDu6xuUC9JcJaYw4Dx/UidKAq77+eOdgnBC4i 889fn11O+Za+BqSrz2WGc7F/knVGsDizui1NkIJaLyEzE13nimNw5bRty6MAmuBuxv2MmCPpUd8Jz owRGaqabOo0txWr8lpuYXRXudEEcd0A==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.90_1 #2 (Red Hat Linux)) id 1gSVje-0004xo-6N; Thu, 29 Nov 2018 23:28:42 +0000 Received: from esa2.hgst.iphmx.com ([68.232.143.124]) by bombadil.infradead.org with esmtps (Exim 4.90_1 #2 (Red Hat Linux)) id 1gSVja-0004vC-Te; Thu, 29 Nov 2018 23:28:40 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=wdc.com; i=@wdc.com; q=dns/txt; s=dkim.wdc.com; t=1543534309; x=1575070309; h=from:to:cc:subject:date:message-id; bh=L7Qnx+G1U15UoezilU3DKAcIr1VLVm+CQnW9+MoRsKs=; b=mcLaErqtxlJWhwu3x5oL2RCvdZ5N9QXWCJIWCZDjC4oFG9w5QLvs12E3 Z4xN3TMC1//xY8UA0FeDxYTCUp/ax7+a/ltRvTfceFAW4ch20jDtMNfbr nT1ZvtcssuprLNtzSpRipmvCSrK+i4VmeROhub8l4k63OAxE1yqR6DCMV jXJFUGADYTUzQZgxZNUbh9dmt5nWZoSGfLAs8L2EGm0yXuEIVzUU/e4py H+fpYEvGPf3+BOhP8wEjOdwaZ+J7ydbHRpr9wdNi3IES/4HvJjmjp5ab/ UbfwCxszDkKedGoa1sA+UX8Y2Wcdj9SxsLNRI6TbrTTZpxYm0rTMlYFtT w==; X-IronPort-AV: E=Sophos;i="5.56,296,1539619200"; d="scan'208";a="193267101" Received: from h199-255-45-15.hgst.com (HELO uls-op-cesaep02.wdc.com) ([199.255.45.15]) by ob1.hgst.iphmx.com with ESMTP; 30 Nov 2018 07:31:30 +0800 Received: from uls-op-cesaip02.wdc.com ([10.248.3.37]) by uls-op-cesaep02.wdc.com with ESMTP; 29 Nov 2018 15:11:23 -0800 Received: from jedi-01.sdcorp.global.sandisk.com (HELO jedi-01.int.fusionio.com) ([10.11.143.218]) by uls-op-cesaip02.wdc.com with ESMTP; 29 Nov 2018 15:28:26 -0800 From: Atish Patra To: linux-kernel@vger.kernel.org Subject: [RFT PATCH v1 0/4] Unify CPU topology across ARM64 & RISC-V Date: Thu, 29 Nov 2018 15:28:16 -0800 Message-Id: <1543534100-3654-1-git-send-email-atish.patra@wdc.com> X-Mailer: git-send-email 2.7.4 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20181129_152839_051865_4DAB6609 X-CRM114-Status: GOOD ( 14.27 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Mark Rutland , "Rafael J. Wysocki" , "Peter Zijlstra \(Intel\)" , Catalin Marinas , Palmer Dabbelt , Will Deacon , Atish Patra , linux-riscv@lists.infradead.org, Morten Rasmussen , Juri Lelli , Dmitriy Cherkasov , Anup Patel , Ingo Molnar , devicetree@vger.kernel.org, Albert Ou , Rob Herring , Thomas Gleixner , "moderated list:ARM64 PORT AARCH64 ARCHITECTURE" , Ard Biesheuvel , Greg Kroah-Hartman , Jeremy Linton , Sudeep Holla MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP The cpu-map DT entry in ARM64 can describe the CPU topology in much better way compared to other existing approaches. RISC-V can easily adopt this binding to represent it's own CPU topology. Thus, both cpu-map DT binding and topology parsing code can be moved to a common location so that RISC-V or any other architecture can leverage that. The relevant discussion regarding unifying cpu topology can be found in [1]. arch_topology seems to be a perfect place to move the common code. I have not introduced any functional changes in the moved code. The only downside in this approach is that the capacity code will be executed for RISC-V as well. But, it will exit immediately after not able to find the appropriate DT node. If the overhead is considered too much, we can always compile out capacity related functions under a different config for the architectures that do not support them. The patches have been tested for RISC-V and compile tested for ARM64 & x86. The socket change[2] is also now part of this series. [1] https://lkml.org/lkml/2018/11/6/19 [2] https://lkml.org/lkml/2018/11/7/918 QEMU changes for RISC-V topology are available at https://github.com/atishp04/riscv-qemu/tree/cpu_topo Apologies for the previous patch series with incorrect title and was sent only to kernel mailing list due to a bug in my config. Please ignore that. Atish Patra (3): dt-binding: cpu-topology: Move cpu-map to a common binding. cpu-topology: Move cpu topology code to common code. RISC-V: Parse cpu topology during boot. Sudeep Holla (1): Documentation: DT: arm: add support for sockets defining package boundaries .../{arm/topology.txt => cpu/cpu-topology.txt} | 133 +++++++-- arch/arm64/include/asm/topology.h | 22 -- arch/arm64/kernel/topology.c | 303 +-------------------- arch/riscv/Kconfig | 1 + arch/riscv/kernel/smpboot.c | 3 + drivers/base/arch_topology.c | 294 ++++++++++++++++++++ include/linux/arch_topology.h | 26 ++ include/linux/topology.h | 1 + 8 files changed, 435 insertions(+), 348 deletions(-) rename Documentation/devicetree/bindings/{arm/topology.txt => cpu/cpu-topology.txt} (66%) Tested-by: Jeffrey Hugo --- 2.7.4