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=-7.2 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=no 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 47D0FC83013 for ; Tue, 1 Dec 2020 20:13:59 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D7B9D20644 for ; Tue, 1 Dec 2020 20:13:58 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=broadcom.com header.i=@broadcom.com header.b="ZlgjgO0C" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730562AbgLAUNu (ORCPT ); Tue, 1 Dec 2020 15:13:50 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43196 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726148AbgLAUNr (ORCPT ); Tue, 1 Dec 2020 15:13:47 -0500 Received: from mail-wm1-x342.google.com (mail-wm1-x342.google.com [IPv6:2a00:1450:4864:20::342]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 75A6BC0613CF for ; Tue, 1 Dec 2020 12:13:07 -0800 (PST) Received: by mail-wm1-x342.google.com with SMTP id f190so9195222wme.1 for ; Tue, 01 Dec 2020 12:13:07 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=broadcom.com; s=google; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=xbti+bo3ngmimpoLE+G16fb4SRorqSvOe7wdGJNs8wA=; b=ZlgjgO0CTl/4YF2De4/tPz2DCQ7IgkESY/jVz04KImwug+t7x6ksZSag8YileFYomo 90ziMZTcq4wgGB227QRUCskMwn/5srntfTkVdcCSFfgpsVV4jEAkC+/nVPjrT2ml2rrJ Xv5PkDTRsme26FYGaWtO+EAGyRx9obAFz4GWw= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=xbti+bo3ngmimpoLE+G16fb4SRorqSvOe7wdGJNs8wA=; b=oaNT3l69fuL4PTrOgZLIKMBZsiCVG9TqzxVdBvMgSRK0rrEMLP8OFRh8nz/7Y7ddXW X7NtB36binc4oPrSHfiyUv+YsDM556mNuIWTP51qAq65kLakwofJYvhfevfsnzhq+ufv XYAss1xYPv2a0YaW8sDhM77HMAHKeqcspAb6s7MZYqQ4S4ml7mtUTnwFRu4D38H4/gFD x0KqN5KcuFEUfbGNsLHZs2dIwzFjJs7SpE2lq3CqLdLTLjwH+1jLExAjKVgEwGrcOcFw p5wMkmVo1jHSmHiO9UkOhJz8KtJa0cFuGLL6Dq8+rQqaFExBjMBPOqEzEWvpLgnH2Dj1 MA/g== X-Gm-Message-State: AOAM533iS18glKYbKaAOVqf/NkeDZlAjPdUShK87mT7jcoGB7/NugqrB Sm4Uotqemdynflv1yu6tG+KhZbTDpX1YLwOWQ1E8bQ== X-Google-Smtp-Source: ABdhPJxbQY47PCNyNf7cE2WuaEWP7oTCvGdthwX66n4r9NJqX/Q0qoYMqAfwC6iVEbh2xMopkeM+rfCpQ02nrofSbtI= X-Received: by 2002:a7b:c157:: with SMTP id z23mr4505630wmi.35.1606853586071; Tue, 01 Dec 2020 12:13:06 -0800 (PST) MIME-Version: 1.0 References: <20201130211145.3012-6-james.quinlan@broadcom.com> <20201201180503.GA1321042@bjorn-Precision-5520> In-Reply-To: <20201201180503.GA1321042@bjorn-Precision-5520> From: Jim Quinlan Date: Tue, 1 Dec 2020 15:12:54 -0500 Message-ID: Subject: Re: [PATCH v2 5/6] PCI: brcmstb: Add panic/die handler to RC driver To: Bjorn Helgaas Cc: "open list:PCI NATIVE HOST BRIDGE AND ENDPOINT DRIVERS" , Nicolas Saenz Julienne , Mark Brown , "maintainer:BROADCOM BCM7XXX ARM ARCHITECTURE" , Lorenzo Pieralisi , Rob Herring , Bjorn Helgaas , Florian Fainelli , "moderated list:BROADCOM BCM2711/BCM2835 ARM ARCHITECTURE" , "moderated list:BROADCOM BCM2711/BCM2835 ARM ARCHITECTURE" , open list Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha-256; boundary="0000000000003938da05b56cc13b" Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org --0000000000003938da05b56cc13b Content-Type: text/plain; charset="UTF-8" On Tue, Dec 1, 2020 at 1:05 PM Bjorn Helgaas wrote: > > On Mon, Nov 30, 2020 at 04:11:42PM -0500, Jim Quinlan wrote: > > Whereas most PCIe HW returns 0xffffffff on illegal accesses and the like, > > by default Broadcom's STB PCIe controller effects an abort. This simple > > handler determines if the PCIe controller was the cause of the abort and if > > so, prints out diagnostic info. > > What happens during enumeration? pci_bus_generic_read_dev_vendor_id() > assumes a read of Vendor ID returns 0xffffffff if the device doesn't > exist. > > I assume this case doesn't cause the abort you're referring to here, > or nothing would work. I think this enumeration case results in PCIe > Unsupported Request errors (PCIe r5.0, sec 2.3.2 implementation note). Hi Bjorn, Yes, our controller makes a special case to allow for config-space accesses to the dev_id and vendor_id registers. even if the device is missing. That being said, it will abort on any access if the link is down. However, the 7216-type SOCs bring PCIe error-reporting HW but also have a mode where 0xffffffff is returned on improper accesses, just like many other controllers. We are debating whether we should turn this on by default. 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