From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.6 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id B0DA4C2D0DB for ; Fri, 24 Jan 2020 15:21:27 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 7A0F320709 for ; Fri, 24 Jan 2020 15:21:27 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="STZaIwlv" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 7A0F320709 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:43576 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1iv0ly-0001z5-La for qemu-devel@archiver.kernel.org; Fri, 24 Jan 2020 10:21:26 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:52116) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1iv0kv-0001Tu-Sr for qemu-devel@nongnu.org; Fri, 24 Jan 2020 10:20:22 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1iv0kt-0000fK-NM for qemu-devel@nongnu.org; Fri, 24 Jan 2020 10:20:20 -0500 Received: from us-smtp-2.mimecast.com ([205.139.110.61]:44539 helo=us-smtp-delivery-1.mimecast.com) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1iv0kt-0000dl-JP for qemu-devel@nongnu.org; Fri, 24 Jan 2020 10:20:19 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1579879218; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:content-type:content-type: content-transfer-encoding:content-transfer-encoding; bh=eTvZW/NuBUyjbIqaM5XAzELe4PNB00uLxVbFzd412W8=; b=STZaIwlvOjOx3msN/E8bcNSy+pgbsEsulGh42dvIxyKEWSBv1en3cn3Klrqpk8yQvJeH3v ny85O0zEgBNagfKO1LR5Jw4ssXFxm8JsP5T/wfXB+zjJ5ODNlHqkn22JvNrb182PQ2maiz osaE3UQj8bTG0W7IWvAmrODNfo28Wx4= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-440-ZXwSItErOBebX4xchJR6Bw-1; Fri, 24 Jan 2020 10:20:16 -0500 Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.phx2.redhat.com [10.5.11.13]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id D655E10A6430 for ; Fri, 24 Jan 2020 15:20:12 +0000 (UTC) Received: from dell-r430-03.lab.eng.brq.redhat.com (dell-r430-03.lab.eng.brq.redhat.com [10.37.153.18]) by smtp.corp.redhat.com (Postfix) with ESMTP id 0E78F8DC16; Fri, 24 Jan 2020 15:20:04 +0000 (UTC) From: Igor Mammedov To: qemu-devel@nongnu.org Subject: [PATCH] acpi: cpuhp: document how to use CPHP_GET_CPU_ID_CMD command Date: Fri, 24 Jan 2020 16:17:45 +0100 Message-Id: <1579879065-3873-1-git-send-email-imammedo@redhat.com> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.13 X-MC-Unique: ZXwSItErOBebX4xchJR6Bw-1 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: quoted-printable X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 205.139.110.61 X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: lersek@redhat.com, philmd@redhat.com, mst@redhat.com Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" Commit 3a61c8db9d25 introduced CPHP_GET_CPU_ID_CMD command but did not sufficiently described how to use it. Fix it by adding missing command documentation and suggested work-flow to enumerate possible architecture specific CPU IDs. Fixes: 3a61c8db9d25 ("acpi: cpuhp: add CPHP_GET_CPU_ID_CMD command") Signed-off-by: Igor Mammedov --- docs/specs/acpi_cpu_hotplug.txt | 15 +++++++++++++++ 1 file changed, 15 insertions(+) diff --git a/docs/specs/acpi_cpu_hotplug.txt b/docs/specs/acpi_cpu_hotplug.= txt index a8ce5e7..81b4534 100644 --- a/docs/specs/acpi_cpu_hotplug.txt +++ b/docs/specs/acpi_cpu_hotplug.txt @@ -94,6 +94,8 @@ write access: register in QEMU 2: following writes to 'Command data' register set OST status register in QEMU + 3: following reads from 'Command data' and 'Command data 2' re= turn + architecture specific CPU ID value for currently selected C= PU. other values: reserved [0x6-0x7] reserved [0x8] Command data: (DWORD access) @@ -147,3 +149,16 @@ Typical usecases: 11. Otherwise store 0x0 to the 'CPU selector' register, to put it into a valid state and exit. The iterator at this point equals "max_cpus". + + - Enumerate present/non present CPUs architecture specific IDs + (in case of x86: ACPIC IDs) + 01: Use "Enumerate CPUs present/non present CPUs" to get max_cpus + 02: Store 0x3 in the 'Command field' register + 03: Set 'current cpu selector' iterator to 0x0 + 04: Store the iterator to the 'CPU selector' register + 05: Read from registers 'Command data' and 'Command data 2' parts of= ID, + combine them into ID like following: + 'Command data 2' << 32 | 'Command data' + and store pair 'current cpu selector' : ID for further processin= g + 06: Increment the iterator and if the iterator < max_cpus go to step= 4 + 07: Otherwise store 0x0 to the 'CPU selector' register and exit. --=20 2.7.4