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 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 1D8F0EEAA41 for ; Thu, 14 Sep 2023 13:54:29 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-ID:Subject:CC:To:From:Date:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=nJAuwNM1/VTHyR/MdVhYwzA/D8SrfGLNpBmZ88ZHYGU=; b=jOjwqL0t8HspLh vfgCP0eTqxOWg1AaYDPJ1beNVpkRv03yC3d0ZsORWUPhgaQTz+PpHH+dSdDjVR2a3dftQSEszJTZo G2Hcnk3j4TJDEpNrYA//W9Nxv0aBTPJiRgkKtdHfEF2vucBal6BVikVWwqoIRn7FdI6vRugcyH96m e2JLat6B1sIHO7EPt+nnTfmXbd6H2gKOl8178Iqf/UbaA8yqxB9qOAgAXj9/qGKoxalG1w0CNP8uQ 8mnrEj2YkYn8H06Yc1jgHb97Yq4tTgt+EBG2wFp2pfbxSshpYfq9uony8Uogf4hnSF/nVoq5bHDb1 zmE6ikAKOUf//f28m5dQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.96 #2 (Red Hat Linux)) id 1qgmnF-008Ydx-05; Thu, 14 Sep 2023 13:54:05 +0000 Received: from frasgout.his.huawei.com ([185.176.79.56]) by bombadil.infradead.org with esmtps (Exim 4.96 #2 (Red Hat Linux)) id 1qgmnA-008YaA-2o; Thu, 14 Sep 2023 13:54:03 +0000 Received: from lhrpeml500005.china.huawei.com (unknown [172.18.147.226]) by frasgout.his.huawei.com (SkyGuard) with ESMTP id 4RmdwB3Lzdz6D8rX; Thu, 14 Sep 2023 21:49:14 +0800 (CST) Received: from localhost (10.202.227.76) by lhrpeml500005.china.huawei.com (7.191.163.240) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.31; Thu, 14 Sep 2023 14:53:54 +0100 Date: Thu, 14 Sep 2023 14:53:53 +0100 From: Jonathan Cameron To: James Morse CC: , , , , , , , , , Salil Mehta , Russell King , Jean-Philippe Brucker , , Subject: Re: [RFC PATCH v2 15/35] ACPI: processor: Add support for processors described as container packages Message-ID: <20230914145353.000072e2@Huawei.com> In-Reply-To: <20230913163823.7880-16-james.morse@arm.com> References: <20230913163823.7880-1-james.morse@arm.com> <20230913163823.7880-16-james.morse@arm.com> Organization: Huawei Technologies Research and Development (UK) Ltd. X-Mailer: Claws Mail 4.1.0 (GTK 3.24.33; x86_64-w64-mingw32) MIME-Version: 1.0 X-Originating-IP: [10.202.227.76] X-ClientProxiedBy: lhrpeml500006.china.huawei.com (7.191.161.198) To lhrpeml500005.china.huawei.com (7.191.163.240) X-CFilter-Loop: Reflected X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230914_065401_193980_C6882544 X-CRM114-Status: GOOD ( 23.91 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Wed, 13 Sep 2023 16:38:03 +0000 James Morse wrote: > ACPI has two ways of describing processors in the DSDT. Either as a device > object with HID ACPI0007, or as a type 'C' package inside a Processor > Container. The ACPI processor driver probes CPUs described as devices, but > not those described as packages. > Specification reference needed... Terminology wise, I'd just refer to Processor() objects as I think they are named objects rather than data terms like a package (Which include a PkgLength etc) > Duplicate descriptions are not allowed, the ACPI processor driver already > parses the UID from both devices and containers. acpi_processor_get_info() > returns an error if the UID exists twice in the DSDT. > > The missing probe for CPUs described as packages creates a problem for > moving the cpu_register() calls into the acpi_processor driver, as CPUs > described like this don't get registered, leading to errors from other > subsystems when they try to add new sysfs entries to the CPU node. > (e.g. topology_sysfs_init()'s use of topology_add_dev() via cpuhp) > > To fix this, parse the processor container and call acpi_processor_add() > for each processor that is discovered like this. The processor container > handler is added with acpi_scan_add_handler(), so no detach call will > arrive. > > Qemu TCG describes CPUs using packages in a processor container. processor terms in a processor container. > > Signed-off-by: James Morse Otherwise looks fine to me. Jonathan > --- > drivers/acpi/acpi_processor.c | 22 ++++++++++++++++++++++ > 1 file changed, 22 insertions(+) > > diff --git a/drivers/acpi/acpi_processor.c b/drivers/acpi/acpi_processor.c > index c0839bcf78c1..b4bde78121bb 100644 > --- a/drivers/acpi/acpi_processor.c > +++ b/drivers/acpi/acpi_processor.c > @@ -625,9 +625,31 @@ static struct acpi_scan_handler processor_handler = { > }, > }; > > +static acpi_status acpi_processor_container_walk(acpi_handle handle, > + u32 lvl, > + void *context, > + void **rv) > +{ > + struct acpi_device *adev; > + acpi_status status; > + > + adev = acpi_get_acpi_dev(handle); > + if (!adev) > + return AE_ERROR; > + > + status = acpi_processor_add(adev, &processor_device_ids[0]); > + acpi_put_acpi_dev(adev); > + > + return status; > +} > + > static int acpi_processor_container_attach(struct acpi_device *dev, > const struct acpi_device_id *id) > { > + acpi_walk_namespace(ACPI_TYPE_PROCESSOR, dev->handle, > + ACPI_UINT32_MAX, acpi_processor_container_walk, > + NULL, NULL, NULL); > + > return 1; > } > _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel