From patchwork Mon Apr 1 15:36:00 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jonathan Cameron X-Patchwork-Id: 161539 Delivered-To: patch@linaro.org Received: by 2002:a02:c6d8:0:0:0:0:0 with SMTP id r24csp612561jan; Mon, 1 Apr 2019 08:37:02 -0700 (PDT) X-Google-Smtp-Source: APXvYqwPe2IrlJsxBIqoxhjzAjEfHW5ZyILScZLuuV2UQl2t3fUkAeOgnljFScSMLgAWVUSceLv7 X-Received: by 2002:a63:5b0a:: with SMTP id p10mr7380546pgb.282.1554133022016; Mon, 01 Apr 2019 08:37:02 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1554133022; cv=none; d=google.com; s=arc-20160816; b=f5pwoU5GnoZZh0JG8XkNzKHHQ5Nos3tHDRHtgjt+kcjfR9nIdQcVyO5TRMBBFoDK8s r8Awer9NAaHLvOCDDntbviv/smrWcUufGYPoxQvtbwGA1YGoLC9cbAaIRfLZzde81RZ8 O6GnnLoTNY2s5Kq1iUhY1Vi8yKsh8RM4XlJWoTSmQfZoOyBdvt/PlRkSz4BylUtk9/vP Tt8733GsF/17hSBBVqr+Szrk4MLKBXGE5G8BGuryWw1U74AFPpS+soP2gjICNvQMiUmg 78mT3yYs9+Sgz3kR1NzekhXZkzDW/oTwHQKQhFA/595i6qBOboTCt/byaGSh7KrEngoE RdRw== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:sender:content-transfer-encoding:mime-version :message-id:date:subject:cc:to:from; bh=Yl60sfy6vyQCDzzSBdC9XVYQbpu2Hg/cYdIWAwEPKQM=; b=BwhdMPcG6iQlKMjZ7DDlsq6FMbE3juEeO79stbffaB7LF5NrbNHzUt3Tj50J+C7273 S7W2fPfL76L18nVv5lLPqQKQwlj4bNf9OtyApknUy/PnlQ29j/RMehV5wQCmm2IZl12/ WjOTfhbxJUJ8GtJoHbtKvRg3mVp9XEPSb07kKMa5MgO+4hJtsfAZF6ZKvcVBPV1Ko3fZ qJol0K35/F+2X0K+xmvNVBs0gXHIBVggNlm2u9QT4bdLKbqNZcz6fM9NRxt60L+EFQy/ e1NR83NAD3oZl7fJ5752gxdxYlf3vbkofylNALLVH6Lj8RsGVbhQC9lbqOY7Q7/c10Zy hLCg== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: best guess record for domain of linux-acpi-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-acpi-owner@vger.kernel.org Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id h126si8728458pgc.365.2019.04.01.08.37.01; Mon, 01 Apr 2019 08:37:02 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-acpi-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of linux-acpi-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-acpi-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726887AbfDAPhB (ORCPT + 9 others); Mon, 1 Apr 2019 11:37:01 -0400 Received: from szxga05-in.huawei.com ([45.249.212.191]:6208 "EHLO huawei.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1726514AbfDAPhA (ORCPT ); Mon, 1 Apr 2019 11:37:00 -0400 Received: from DGGEMS414-HUB.china.huawei.com (unknown [10.3.19.214]) by Forcepoint Email with ESMTP id 557B08508042D64384B8; Mon, 1 Apr 2019 23:36:51 +0800 (CST) Received: from FRA1000014316.huawei.com (100.126.230.97) by DGGEMS414-HUB.china.huawei.com (10.3.19.214) with Microsoft SMTP Server id 14.3.408.0; Mon, 1 Apr 2019 23:36:44 +0800 From: Jonathan Cameron To: , , CC: , , , , Jonathan Cameron Subject: [RFC PATCH v2 0/3] ACPI: Support generic initiator proximity domains Date: Mon, 1 Apr 2019 23:36:00 +0800 Message-ID: <20190401153603.67775-1-Jonathan.Cameron@huawei.com> X-Mailer: git-send-email 2.19.1 MIME-Version: 1.0 X-Originating-IP: [100.126.230.97] Sender: linux-acpi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-acpi@vger.kernel.org Changes since RFC V1. * Fix incorrect interpretation of the ACPI entry noted by Keith Busch * Use the acpica headers definitions that are now in mmotm. It's worth noting that, to safely put a given device in a GI node, may require changes to the existing drivers as it's not unusual to assume you have local memory or processor core. There may be futher constraints not yet covered by this patch. Original cover letter... ACPI 6.3 introduced a new entity that can be part of a NUMA proximity domain. It may share such a domain with the existing options (memory, cpu etc) but it may also exist on it's own. The intent is to allow the description of the NUMA properties (particulary via HMAT) of accelerators and other initiators of memory activity that are not the host processor running the operating system. This patch set introduces 'just enough' to make them work for arm64. It should be trivial to support other architectures, I just don't suitable NUMA systems readily available to test. There are a few quirks that need to be considered. 1. Fall back nodes ****************** As pre ACPI 6.3 supporting operating systems do not have Generic Initiator Proximity Domains it is possible to specify, via _PXM in DSDT that another device is part of such a GI only node. This currently blows up spectacularly. Whilst we can obviously 'now' protect against such a situation (see the related thread on PCI _PXM support and the threadripper board identified there as also falling into the problem of using non existent nodes https://patchwork.kernel.org/patch/10723311/ ), there is no way to be sure we will never have legacy OSes that are not protected against this. It would also be 'non ideal' to fallback to a default node as there may be a better (non GI) node to pick if GI nodes aren't available. The work around is that we also have a new system wide OSC bit that allows an operating system to 'annouce' that it supports Generic Initiators. This allows, the firmware to us DSDT magic to 'move' devices between the nodes dependent on whether our new nodes are there or not. 2. New ways of assigning a proximity domain for devices ******************************************************* Until now, the only way firmware could indicate that a particular device (outside the 'special' set of cpus etc) was to be found in a particular Proximity Domain by the use of _PXM in DSDT. That is equally valid with GI domains, but we have new options. The SRAT affinity structure includes a handle (ACPI or PCI) to identify devices with the system and specify their proximity domain that way. If both _PXM and this are provided, they should give the same answer. For now this patch set completely ignores that feature as we don't need it to start the discussion. It will form a follow up set at some point (if no one else fancies doing it). Jonathan Cameron (3): ACPI: Support Generic Initiator only domains arm64: Support Generic Initiator only domains ACPI: Let ACPI know we support Generic Initiator Affinity Structures arch/arm64/kernel/smp.c | 8 +++++ drivers/acpi/bus.c | 1 + drivers/acpi/numa.c | 62 +++++++++++++++++++++++++++++++++- drivers/base/node.c | 3 ++ include/asm-generic/topology.h | 3 ++ include/linux/acpi.h | 1 + include/linux/nodemask.h | 1 + include/linux/topology.h | 7 ++++ 8 files changed, 85 insertions(+), 1 deletion(-) -- 2.18.0