From patchwork Wed Mar 20 23:48:01 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Atish Patra X-Patchwork-Id: 1059633 Return-Path: X-Original-To: incoming-dt@patchwork.ozlabs.org Delivered-To: patchwork-incoming-dt@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=none (mailfrom) smtp.mailfrom=vger.kernel.org (client-ip=209.132.180.67; helo=vger.kernel.org; envelope-from=devicetree-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=fail (p=none dis=none) header.from=wdc.com Authentication-Results: ozlabs.org; dkim=fail reason="signature verification failed" (2048-bit key; unprotected) header.d=wdc.com header.i=@wdc.com header.b="h0N9QHeN"; dkim-atps=neutral Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 44Pmns4nhKz9sR0 for ; Thu, 21 Mar 2019 10:48:17 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727081AbfCTXsP (ORCPT ); Wed, 20 Mar 2019 19:48:15 -0400 Received: from esa4.hgst.iphmx.com ([216.71.154.42]:11921 "EHLO esa4.hgst.iphmx.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726115AbfCTXsP (ORCPT ); Wed, 20 Mar 2019 19:48:15 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=wdc.com; i=@wdc.com; q=dns/txt; s=dkim.wdc.com; t=1553125694; x=1584661694; h=from:to:cc:subject:date:message-id:mime-version: content-transfer-encoding; bh=MXoKOqnmh4glr82XcmuusqJSAAOR3fVo1vwmgG/zsgo=; b=h0N9QHeNTaS8Hew+J7+u+VgdPKzTbBZCkcQGIASpoXeAuLFhyLRhOm8I GIwoKlQm45cq+cemKsNxc8csdlYDi0bSTAio9qK9w+0dWzXhZJJFTdChF PfPb24toittCM2rizHZpySTtXXupfyb4ja4heKD4ViWIcx2UGc2lJuMOM fUqMaAb3OhMOpEi/g8yKorzEsJwfO/DnxcdGny1auySWcpf85wSFcpkb8 HXaRke+IK0RSUp1plrXarvJZbHM4tI2Iebr+ZwIFznMcZg/56RLH+X+XO yM3ng6oRa2u3/kE6I1uDL2AHSybdQ2FsjwrLLSnGd/nukTZMghZoBzHJD Q==; X-IronPort-AV: E=Sophos;i="5.60,250,1549900800"; d="scan'208";a="103874310" Received: from uls-op-cesaip02.wdc.com (HELO uls-op-cesaep02.wdc.com) ([199.255.45.15]) by ob1.hgst.iphmx.com with ESMTP; 21 Mar 2019 07:48:14 +0800 IronPort-SDR: o3pvRh/zaDgSs6bHmil/KT5JaB+bVJy0PMkufzdEd2y3RLIP+GC2H5zV93gumEm+eUAGRIugH1 1Zke1klBJ6v3wriJrvB3/DfZ58rvouPeX8XodhQuMOgtvpdpIx/bAEaepThobNnpRGpeX/Nm9r 2RlI0Blz6SzyRsCaG5DO+rzXdFgQoZH3UqkbGupx/RsTKJ8QAxZIvf4MJI8JqniCAzKRJ/6qST SlJe7I2uFy3oNbAkFaSG7sv5yHIFb9+vSSzAdxTPfz2TNiYYb+ZZO5STxGViqG3ai9rz52XlG2 Ll+8dGVomm0ttamDI0ZAIN6I Received: from uls-op-cesaip01.wdc.com ([10.248.3.36]) by uls-op-cesaep02.wdc.com with ESMTP; 20 Mar 2019 16:27:51 -0700 IronPort-SDR: IhuVAZBifJqI9IKuS0jMxBGdTiTGwyls+8KLoVoQxR+MZbq17NQMJCS0zCKmfv0FIyjO5ER+xU uKuBwqw/ciq7haWhaHEIk3iVr3tST6zhbS0LPkrpPy5EeDNgiqX3bVX278b8DCIcf+TvF8yB8P od3lJ8UVXt6YkRV6SQonasIb1Py4zUs+W0nWwynSyOsV5qt3dj3wBaQRQ4ULYfxBfcrLk4MgDr GcCUZHd/G16Iswe9a6I/0aEFqnhvrprV/s/sj7igbIhsMn3J1LW6/qV9jVc8tkJm/NekKVyY4o Fr0= Received: from jedi-01.sdcorp.global.sandisk.com (HELO jedi-01.int.fusionio.com) ([10.11.143.218]) by uls-op-cesaip01.wdc.com with ESMTP; 20 Mar 2019 16:48:14 -0700 From: Atish Patra To: linux-kernel@vger.kernel.org Cc: Atish Patra , Albert Ou , Anup Patel , Ard Biesheuvel , Catalin Marinas , devicetree@vger.kernel.org, Dmitriy Cherkasov , Greg Kroah-Hartman , Ingo Molnar , Jeremy Linton , Johan Hovold , linux-riscv@lists.infradead.org, Mark Rutland , Morten Rasmussen , Otto Sabart , Palmer Dabbelt , Paul Walmsley , "Peter Zijlstra (Intel)" , "Rafael J. Wysocki" , Rob Herring , Sudeep Holla , Will Deacon Subject: [RFT/RFC PATCH v3 0/5] Unify CPU topology across ARM & RISC-V Date: Wed, 20 Mar 2019 16:48:01 -0700 Message-Id: <20190320234806.19748-1-atish.patra@wdc.com> X-Mailer: git-send-email 2.21.0 MIME-Version: 1.0 Sender: devicetree-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org The cpu-map DT entry in ARM can describe the CPU topology in much better way compared to other existing approaches. RISC-V can easily adopt this binding to represent its 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 significant 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. There was an opportunity to unify topology data structure for ARM32 done by patch 3/4. But, I refrained from making any other changes as I am not very well versed with original intention for some functions that are present in arch_topology.c. I hope this patch series can be served as a baseline for such changes in the future. The patches have been tested for RISC-V and compile tested for ARM64, ARM32 & 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/qemu/tree/riscv_topology_dt HiFive Unleashed DT with topology node is available here. https://github.com/atishp04/opensbi/tree/HiFive_unleashed_topology It can be verified with OpenSBI with following additional compile time option. FW_PAYLOAD_FDT="unleashed_topology.dtb" Changes from v2->v3 1. Cover letter update with experiment DT for topology changes. 2. Added the patch for [2]. Changes from v1->v2 1. ARM32 can now use the common code as well. Atish Patra (4): dt-binding: cpu-topology: Move cpu-map to a common binding. cpu-topology: Move cpu topology code to common code. arm: Use common cpu_topology RISC-V: Parse cpu topology during boot. Sudeep Holla (1): Documentation: DT: arm: add support for sockets defining package boundaries .../topology.txt => cpu/cpu-topology.txt} | 134 ++++++-- arch/arm/include/asm/topology.h | 22 +- arch/arm/kernel/topology.c | 10 +- arch/arm64/include/asm/topology.h | 23 -- arch/arm64/kernel/topology.c | 303 +----------------- arch/riscv/Kconfig | 1 + arch/riscv/kernel/smpboot.c | 3 + drivers/base/arch_topology.c | 298 ++++++++++++++++- drivers/base/topology.c | 1 + include/linux/arch_topology.h | 36 +++ 10 files changed, 453 insertions(+), 378 deletions(-) rename Documentation/devicetree/bindings/{arm/topology.txt => cpu/cpu-topology.txt} (66%) --- 2.21.0