From patchwork Tue Mar 26 22:39:35 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jeremy Linton X-Patchwork-Id: 10872265 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 8B6B6139A for ; Tue, 26 Mar 2019 22:40:14 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 714F327FA3 for ; Tue, 26 Mar 2019 22:40:14 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 6405C28CC9; Tue, 26 Mar 2019 22:40:14 +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 EBE9E27FA3 for ; Tue, 26 Mar 2019 22:40:13 +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=izj8GS7mNXjlA/BZRfgxVaa5nPBdXK/e3W6Mu6oaP2A=; b=r/mOdkrOuHGR2h h11w+I9Hvzs8aIWpJu4LQEshAKtTRwjHW/katl1F16bzEB75+B684DbV7ou+akJlXrTSGAdcYv0H6 ySi8yuBeuvOdxSZkRsVCWn3gsCPr+uklsSXU0/lzMjgzgtJ7+qB5zTwxkLTyPh5Sy29NKlmtjU+x0 r88bmd2vtYBmd4HXk3MiR0z4AfaWdlTNIguUvPyEL8mDbmRQIM/mKW6X5St+7dX8QFhfyjvfIkA6f c+NiVgeDbCI+cf7mlumojW7YgsIiBp5KY8jHb7PGDAUGqbqly0ONtMwhSGBmsJmLVEUwxAx48sAPi z1FQrbEvbFWw/PXhiJjw==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.90_1 #2 (Red Hat Linux)) id 1h8ujp-0008N3-2X; Tue, 26 Mar 2019 22:40:09 +0000 Received: from foss.arm.com ([217.140.101.70]) by bombadil.infradead.org with esmtp (Exim 4.90_1 #2 (Red Hat Linux)) id 1h8ujc-0007l7-8x for linux-arm-kernel@lists.infradead.org; Tue, 26 Mar 2019 22:39:58 +0000 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 852C71596; Tue, 26 Mar 2019 15:39:54 -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 E6DC03F614; Tue, 26 Mar 2019 15:39:53 -0700 (PDT) From: Jeremy Linton To: linux-arm-kernel@lists.infradead.org Subject: [PATCH 1/4] ACPI/PPTT: Add function to return ACPI 6.3 Identical tokens Date: Tue, 26 Mar 2019 17:39:35 -0500 Message-Id: <20190326223938.5365-2-jeremy.linton@arm.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190326223938.5365-1-jeremy.linton@arm.com> References: <20190326223938.5365-1-jeremy.linton@arm.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190326_153956_318936_89C2FB62 X-CRM114-Status: GOOD ( 10.78 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: mark.rutland@arm.com, lorenzo.pieralisi@arm.com, will.deacon@arm.com, sudeep.holla@arm.com, rjw@rjwysocki.net, linux-kernel@vger.kernel.org, Jeremy Linton , linuxarm@huawei.com, linux-acpi@vger.kernel.org, james.morse@arm.com, catalin.marinas@arm.com, 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 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(+) diff --git a/drivers/acpi/pptt.c b/drivers/acpi/pptt.c index 065c4fc245d1..472c95ec816b 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() - Determine a unique implementation + * @cpu: Kernel logical cpu number + * + * Determine a unique heterogeneous ID for the given CPU. CPUs with the same + * implementation should have matching IDs. Since this is a tree we can only + * detect implementations where the heterogeneous flag is the parent to all + * matching cores. AKA if a two socket machine has two different core types + * in each socket this will end up being represented as four unique core types + * rather than two. + * + * The returned ID 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. + * + * 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;