From patchwork Fri May 3 23:24:04 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jeremy Linton X-Patchwork-Id: 163335 Delivered-To: patch@linaro.org Received: by 2002:a92:7e86:0:0:0:0:0 with SMTP id q6csp1197945ill; Fri, 3 May 2019 16:24:29 -0700 (PDT) X-Google-Smtp-Source: APXvYqzocrrgq48TFHM+funEVxd6rxlDvHfw2Fi8PoHd5IWiFxhCH7zoDpEyo7lS4t3baUGuAacz X-Received: by 2002:a17:902:820a:: with SMTP id x10mr14551171pln.316.1556925869635; Fri, 03 May 2019 16:24:29 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1556925869; cv=none; d=google.com; s=arc-20160816; b=DwDJO4oi0DMpIRCIsDRdsBOydLFmjhlmTns+uqRcFfY28HPT2w4keMdjVE9hB6bRqH hXfMzdgtXjNZ1/t9IRYkl0ma+DL+DUSjSh/gAIbNT0x5LGqnWfb/2w6ZlO4JiGtUjee2 /jPb/ue3tbrxhMnlo3cKK7zkC8prilIWE3Ik4dAwob5G1OFYBDoYBMYFIWPG5V4dSE7x wD/0ZJor1p6BWsx21ra6suHDpdJt2+rjZzNmujYfvGwUaZ8X2EVnZdBhMfoSC33MoIJY T4VBukrkAz/M+m3AVTsxbebEiEwBEqUlNarcUhX04GMfaOeNztW8QM+q+OlFxXWWlizo qenA== 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 :references:in-reply-to:message-id:date:subject:cc:to:from; bh=SF9SiONcv108u86ar2jpmk3grTd5bZTvlAwE8kxmPrg=; b=bA97/jdcotOyVLLgSaACDAesKqDUGvi8epJsOo1SgMSJcVVKIpzrKYKhnObWrvyi2g 6fct+ghxHhAE1SGOBxwSTRuXgQ5bDiF7bZcfdrTvSsBPVjUZIL0rNVBZQywL8UNzT/wM ghVUEtKQyQ9tO/iA8owVTKeg3oZmcVExoZ7rHPac1IbR4C4ov1ZpnPqRc52+JbO5cF9H TCG/yR5eefEs0b7W+EpgwkyqZEDhz2oLZ2TenlChFsUv3RjgwqYxHP6xf3+up8gss6MY SXY+4bqnttJ+RgpIr4iyifZVpYeMMQi5QSvp3vPwsqDWDYlGSzCYf2NuzXhluOlpnkSK tPAA== 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 x3si4677027plv.33.2019.05.03.16.24.29; Fri, 03 May 2019 16:24:29 -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 S1726244AbfECXY3 (ORCPT + 9 others); Fri, 3 May 2019 19:24:29 -0400 Received: from usa-sjc-mx-foss1.foss.arm.com ([217.140.101.70]:40208 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726059AbfECXY2 (ORCPT ); Fri, 3 May 2019 19:24:28 -0400 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.72.51.249]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id E85A815BF; Fri, 3 May 2019 16:24:27 -0700 (PDT) Received: from mammon-tx2.austin.arm.com (mammon-tx2.austin.arm.com [10.118.29.246]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id 5E8273F557; Fri, 3 May 2019 16:24:27 -0700 (PDT) From: Jeremy Linton To: linux-arm-kernel@lists.infradead.org Cc: linux-acpi@vger.kernel.org, catalin.marinas@arm.com, will.deacon@arm.com, rjw@rjwysocki.net, lenb@kernel.org, mark.rutland@arm.com, lorenzo.pieralisi@arm.com, sudeep.holla@arm.com, linuxarm@huawei.com, john.garry@huawei.com, Jeremy Linton Subject: [PATCH v3 2/5] ACPI/PPTT: Add function to return ACPI 6.3 Identical tokens Date: Fri, 3 May 2019 18:24:04 -0500 Message-Id: <20190503232407.37195-3-jeremy.linton@arm.com> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20190503232407.37195-1-jeremy.linton@arm.com> References: <20190503232407.37195-1-jeremy.linton@arm.com> MIME-Version: 1.0 Sender: linux-acpi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-acpi@vger.kernel.org ACPI 6.3 adds a flag to indicate that child nodes are all identical cores. This is useful to authoritatively determine if a set of (possibly offline) cores are identical or not. Since the flag doesn't give us a unique id we can generate one and use it to create bitmaps of sibling nodes, or simply in a loop to determine if a subset of cores are identical. Signed-off-by: Jeremy Linton --- drivers/acpi/pptt.c | 26 ++++++++++++++++++++++++++ include/linux/acpi.h | 5 +++++ 2 files changed, 31 insertions(+) -- 2.21.0 Reviewed-by: Sudeep Holla diff --git a/drivers/acpi/pptt.c b/drivers/acpi/pptt.c index 83a026765faa..1865515297ca 100644 --- a/drivers/acpi/pptt.c +++ b/drivers/acpi/pptt.c @@ -660,3 +660,29 @@ int find_acpi_cpu_topology_package(unsigned int cpu) return find_acpi_cpu_topology_tag(cpu, PPTT_ABORT_PACKAGE, ACPI_PPTT_PHYSICAL_PACKAGE); } + +/** + * find_acpi_cpu_topology_hetero_id() - Get a core architecture tag + * @cpu: Kernel logical CPU number + * + * Determine a unique heterogeneous tag for the given CPU. CPUs with the same + * implementation should have matching tags. + * + * The returned tag can be used to group peers with identical implementation. + * + * The search terminates when a level is found with the identical implementation + * flag set or we reach a root node. + * + * Due to limitations in the PPTT data structure, there may be rare situations + * where two cores in a heterogeneous machine may be identical, but won't have + * the same tag. + * + * Return: -ENOENT if the PPTT doesn't exist, or the CPU cannot be found. + * Otherwise returns a value which represents a group of identical cores + * similar to this CPU. + */ +int find_acpi_cpu_topology_hetero_id(unsigned int cpu) +{ + return find_acpi_cpu_topology_tag(cpu, PPTT_ABORT_PACKAGE, + ACPI_PPTT_ACPI_IDENTICAL); +} diff --git a/include/linux/acpi.h b/include/linux/acpi.h index d5dcebd7aad3..1444fb042898 100644 --- a/include/linux/acpi.h +++ b/include/linux/acpi.h @@ -1309,6 +1309,7 @@ static inline int lpit_read_residency_count_address(u64 *address) #ifdef CONFIG_ACPI_PPTT int find_acpi_cpu_topology(unsigned int cpu, int level); int find_acpi_cpu_topology_package(unsigned int cpu); +int find_acpi_cpu_topology_hetero_id(unsigned int cpu); int find_acpi_cpu_cache_topology(unsigned int cpu, int level); #else static inline int find_acpi_cpu_topology(unsigned int cpu, int level) @@ -1319,6 +1320,10 @@ static inline int find_acpi_cpu_topology_package(unsigned int cpu) { return -EINVAL; } +static int find_acpi_cpu_topology_hetero_id(unsigned int cpu) +{ + return -EINVAL; +} static inline int find_acpi_cpu_cache_topology(unsigned int cpu, int level) { return -EINVAL;