From patchwork Thu Aug 1 03:46:34 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jeremy Linton X-Patchwork-Id: 11070161 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 3E69F13B1 for ; Thu, 1 Aug 2019 03:46:56 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 2FE6C2842B for ; Thu, 1 Aug 2019 03:46:56 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 23F002842E; Thu, 1 Aug 2019 03:46:56 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.2 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,MAILING_LIST_MULTI,RCVD_IN_DNSWL_MED autolearn=ham version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 8E0652843B for ; Thu, 1 Aug 2019 03:46:54 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=wGG6ett6IyDQUAky9i8A1a/WtkQj9s3+lpajyRS7JXY=; b=AD/99eot3ATpd+ DYvdEIZ51uk6D3poVIUQTY7L9DxADYIvEoRn6yfuXGHVZIes1JgHmdbwdn/QLmqCA9AzFk4xLjAfV lm4u/cPHtMAzgS/f2BWCEzu6FaH5RUsjSvEzXCsOoyefZZ5i4rAea0ew7rpx2QdfBSV5ANlt4rOmf qrRxv/ql+EqZ3JMJGkwEKCzUidYYq7J9oqAmhLhuCITpe7n6mdmW0Rt/zW/KksG2F2g9guZdFL/Dl mF5C/s64xAa1ge6wnOk4/+gev2gIXOPqzLnsRrFUBvQuG+FJIoWYBXcV1JLkG4I/tdBWaubKKKPPm x6oRKHtHZWIH/w+Pk6Ww==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92 #3 (Red Hat Linux)) id 1ht23J-0000K9-N3; Thu, 01 Aug 2019 03:46:53 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.92 #3 (Red Hat Linux)) id 1ht23A-0000DG-Kx for linux-arm-kernel@lists.infradead.org; Thu, 01 Aug 2019 03:46:45 +0000 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 30EE41596; Wed, 31 Jul 2019 20:46:44 -0700 (PDT) Received: from mammon-tx2.austin.arm.com (mammon-tx2.austin.arm.com [10.118.30.64]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id 209333F575; Wed, 31 Jul 2019 20:46:44 -0700 (PDT) From: Jeremy Linton To: linux-arm-kernel@lists.infradead.org Subject: [PATCH v4 2/2] arm64: topology: Use PPTT to determine if PE is a thread Date: Wed, 31 Jul 2019 22:46:34 -0500 Message-Id: <20190801034634.26913-3-jeremy.linton@arm.com> X-Mailer: git-send-email 2.21.0 In-Reply-To: <20190801034634.26913-1-jeremy.linton@arm.com> References: <20190801034634.26913-1-jeremy.linton@arm.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190731_204644_727873_19606FBC X-CRM114-Status: GOOD ( 11.44 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: lorenzo.pieralisi@arm.com, catalin.marinas@arm.com, rjw@rjwysocki.net, Jeremy Linton , linux-acpi@vger.kernel.org, sudeep.holla@arm.com, will@kernel.org, lenb@kernel.org Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP ACPI 6.3 adds a thread flag to represent if a CPU/PE is actually a thread. Given that the MPIDR_MT bit may not represent this information consistently on homogeneous machines we should prefer the PPTT flag if its available. Signed-off-by: Jeremy Linton Reviewed-by: Sudeep Holla --- arch/arm64/kernel/topology.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) diff --git a/arch/arm64/kernel/topology.c b/arch/arm64/kernel/topology.c index 0825c4a856e3..cbbedb53cf06 100644 --- a/arch/arm64/kernel/topology.c +++ b/arch/arm64/kernel/topology.c @@ -346,11 +346,9 @@ void remove_cpu_topology(unsigned int cpu) */ static int __init parse_acpi_topology(void) { - bool is_threaded; + int is_threaded; int cpu, topology_id; - is_threaded = read_cpuid_mpidr() & MPIDR_MT_BITMASK; - for_each_possible_cpu(cpu) { int i, cache_id; @@ -358,6 +356,10 @@ static int __init parse_acpi_topology(void) if (topology_id < 0) return topology_id; + is_threaded = acpi_pptt_cpu_is_thread(cpu); + if (is_threaded < 0) + is_threaded = read_cpuid_mpidr() & MPIDR_MT_BITMASK; + if (is_threaded) { cpu_topology[cpu].thread_id = topology_id; topology_id = find_acpi_cpu_topology(cpu, 1);