From patchwork Wed Jun 26 21:37:16 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jeremy Linton X-Patchwork-Id: 167865 Delivered-To: patch@linaro.org Received: by 2002:a92:4782:0:0:0:0:0 with SMTP id e2csp1463734ilk; Wed, 26 Jun 2019 14:37:47 -0700 (PDT) X-Google-Smtp-Source: APXvYqxsyniPEmztSpYrjAuVqF+qk9BLt+G9w7v/vbIs7hWGlPOc+kFN6CnrszooKcYWvOOSu2Oa X-Received: by 2002:a17:90a:8a17:: with SMTP id w23mr1424023pjn.139.1561585067018; Wed, 26 Jun 2019 14:37:47 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1561585067; cv=none; d=google.com; s=arc-20160816; b=Lpb2kvmVWWuvZBsoTH5ebbeX3Vdv4HvdOicQHoqUQCUelQgA3auNB3xAVkSlEhzUeZ wfcpEXKorAFjCUMDcQhF6SrUkDbLd2+lxEGZrV9iyABr4Rm8s5H/hAdwXOA9rMegYxAk f6EbVSpNU5PrP+4q0C+KTfOYtbSh2V7Aa1a1BB+tRHilr3S9KIUmX/ddmnL7dn0bzpc7 gR996v4F8nKZo2396n+3VM/JZ+QlR4j76bInLCrRdacwyruTfXH9sLSQRiMTkSmMbEoN npG4uK9pVAmhIsHOmAgk07Nq8JFNSfbI4aDlb1uRyiFMZ4yATNhRaVVCBolwlZad2gH0 d9CQ== 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=punlWamarc/kInxVzBv+9RyX2ZpsGfxWycsgm2VQe88=; b=k029IKcIMCiMwmTCBW4ltvaqZoIpZNh37yktilNWWTJnvGNF6EbvuE5JjPZn9zZXqt hlGlUxYeL2esO9YsHW7UIkg96okzE/vTC3v75KsKYZuWZsfEcxHo3nnpzDB/JHaaKKil Jz3zhxtE1Ef9jOLo9a9eG2bvWf5Od5aJAtdBBgVeZyvO4GoEACkDE3fPHPH82JKOCXPI VrFcvmh1sjldSgOiUVfviF0hUbl+oEKfudRUi6/RZnaTZ32N6gdSWkQsstsZPV3N0USa sPBjX2AgcFD/2CQlgNZ1wFBhOrB8q/AF5cAZUZkTfIi0xgUda1Ae2scsNIEPHWoYtqri NSfw== 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 t1si178178pgv.169.2019.06.26.14.37.46; Wed, 26 Jun 2019 14:37:47 -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 S1726223AbfFZVhq (ORCPT + 8 others); Wed, 26 Jun 2019 17:37:46 -0400 Received: from foss.arm.com ([217.140.110.172]:41442 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726429AbfFZVhe (ORCPT ); Wed, 26 Jun 2019 17:37:34 -0400 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 0FB1011D4; Wed, 26 Jun 2019 14:37:34 -0700 (PDT) Received: from mammon-tx2.austin.arm.com (mammon-tx2.austin.arm.com [10.118.30.49]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id F26903F246; Wed, 26 Jun 2019 14:37:33 -0700 (PDT) From: Jeremy Linton To: linux-arm-kernel@lists.infradead.org Cc: linux-acpi@vger.kernel.org, linux-kernel@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, Jeremy Linton , Hanjun Gou Subject: [PATCH v5 2/4] ACPI/PPTT: Add function to return ACPI 6.3 Identical tokens Date: Wed, 26 Jun 2019 16:37:16 -0500 Message-Id: <20190626213718.39423-3-jeremy.linton@arm.com> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20190626213718.39423-1-jeremy.linton@arm.com> References: <20190626213718.39423-1-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. Tested-by: Hanjun Gou Reviewed-by: Sudeep Holla Signed-off-by: Jeremy Linton --- drivers/acpi/pptt.c | 26 ++++++++++++++++++++++++++ include/linux/acpi.h | 5 +++++ 2 files changed, 31 insertions(+) -- 2.21.0 Acked-by: Rafael J. Wysocki diff --git a/drivers/acpi/pptt.c b/drivers/acpi/pptt.c index 05344413f199..1e7ac0bd0d3a 100644 --- a/drivers/acpi/pptt.c +++ b/drivers/acpi/pptt.c @@ -683,3 +683,29 @@ 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 d315d86844e4..5bcd23e5ccd6 100644 --- a/include/linux/acpi.h +++ b/include/linux/acpi.h @@ -1303,6 +1303,7 @@ 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) @@ -1313,6 +1314,10 @@ static inline int find_acpi_cpu_topology_package(unsigned int cpu) { return -EINVAL; } +static inline 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;