From patchwork Fri Apr 26 22:03:06 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jeremy Linton X-Patchwork-Id: 162977 Delivered-To: patch@linaro.org Received: by 2002:a02:c6d8:0:0:0:0:0 with SMTP id r24csp1246526jan; Fri, 26 Apr 2019 15:03:24 -0700 (PDT) X-Google-Smtp-Source: APXvYqw+273BTPvd4DVckt7fWbuVr4jm8wZnxzr7CvKcCX7OvHnVfQcDWP4LbWOLjVhHG8GXenLu X-Received: by 2002:a62:305:: with SMTP id 5mr13957078pfd.65.1556316204650; Fri, 26 Apr 2019 15:03:24 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1556316204; cv=none; d=google.com; s=arc-20160816; b=FqMIs0AL3uxQwM58FcI98Ql/RNcBseW+yxrpKKD6UDYA0pPbI6j1jc1ZwyNvQuEPLq LEMa23xtNIGXQFTsg7pwleINXaR70N9AeEbn2UN24FLxvoDdM3FBpw/RXSv1BreJ8r8S QG6fUPnIKlZr272zArqCDrhLd4vr7yVZ+PhmgtEhjNFgA76K9gDV0Sa9chyqRsojpysK uzF/f4O2ZUPNuAVD55ZQ3/g4ZcPKSom4yM12/pPQ+QSHxC2K1ueCPW8IsJ3JRwTVBq4M d1SzYf6gX4wo6EGCeWIOBfQ4TuQu4Ypxi7HsGPWPEsrPLxyz47V4lNR9KGvqdH5x/HT4 Sheg== 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=stIvyb5vXc9VDol/qw09e1IDCT0idugUVsNiyfRnQOI=; b=o/NlK44YdrrYpUaK4Y2vWDpKu/NFL/CYXkcVXGZ4zUlDao/RcONtOcsY9HUJiVa7x/ Qu4XWpylNsB6CXMiNZYI9bcheUVuAzOFtGc9EdwoEpldWqtOcNLo2sElAnHCqIDUX0+s Cqit3JSzwzwCKpJzCQEe+osK4zogS6XpmJaZ1A3pDvxvLfDgIYOmb+1x12UvP+r+WgDY BgIxVDy+1RwsWI4ZcR+AxLRUfIz/8crChbDENpTF6S2OGfqGe5fX4o9VBz/BlZs7XJ+i 4Kc2NY0FzOXp7Qi+N2prnobpbjW5zhF0/C703p8G0k5NtaqtuXhUC5+2fXEy7au4jzM/ Ur9g== 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 a3si11946562pgm.455.2019.04.26.15.03.24; Fri, 26 Apr 2019 15:03:24 -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 S1726246AbfDZWDY (ORCPT + 9 others); Fri, 26 Apr 2019 18:03:24 -0400 Received: from foss.arm.com ([217.140.101.70]:52870 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727111AbfDZWDX (ORCPT ); Fri, 26 Apr 2019 18:03:23 -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 664F015AB; Fri, 26 Apr 2019 15:03:23 -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 D059C3F557; Fri, 26 Apr 2019 15:03:22 -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 v2 2/5] ACPI/PPTT: Add function to return ACPI 6.3 Identical tokens Date: Fri, 26 Apr 2019 17:03:06 -0500 Message-Id: <20190426220309.55654-3-jeremy.linton@arm.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190426220309.55654-1-jeremy.linton@arm.com> References: <20190426220309.55654-1-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(+) -- 2.20.1 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;