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=-5.3 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,NICE_REPLY_A, SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 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 EA315C63798 for ; Thu, 26 Nov 2020 06:06:17 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 3E16D20770 for ; Thu, 26 Nov 2020 06:06:17 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=jonmasters-org.20150623.gappssmtp.com header.i=@jonmasters-org.20150623.gappssmtp.com header.b="fODQbTzl" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2387863AbgKZGGB (ORCPT ); Thu, 26 Nov 2020 01:06:01 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44430 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1732403AbgKZGGA (ORCPT ); Thu, 26 Nov 2020 01:06:00 -0500 Received: from mail-io1-xd41.google.com (mail-io1-xd41.google.com [IPv6:2607:f8b0:4864:20::d41]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id CF4DFC061A47 for ; Wed, 25 Nov 2020 22:06:00 -0800 (PST) Received: by mail-io1-xd41.google.com with SMTP id t8so698482iov.8 for ; Wed, 25 Nov 2020 22:06:00 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=jonmasters-org.20150623.gappssmtp.com; s=20150623; h=subject:to:cc:references:from:organization:message-id:date :user-agent:mime-version:in-reply-to:content-language :content-transfer-encoding; bh=oEy5q2En1SJI6u34J14mPbz3ymhjWNLu2ImEmUAs9Ws=; b=fODQbTzlog4xbJsMW2izr9T6xV3uC+lc03b1qJ1qSawbRoENnx1Br2TPMmRNY6FXY4 ozf90S+p14K47ND2crcJTtExuHJ8j6Mt8bza5gS/hxyN2GTaVHahBV6A1qInS4vXwlaJ 81eY/junYJYx/Vcf856DH3Cr64N7ZU+cwY5VtTc+zMWwF6Gq0mZDmDOe50yNYYTWh6Ip jHM+22whCE31Y3BcnmQ8X24tSHUX3wrQjR60Ftzfhqz2HvEr8bG0XTZ0osF0LAr2RnDj MFu4B+QaX/B6Kv1Jqj7k+MhrL15GlxJq+d6WmVs45l8wsfvnf4REBe3jxfZKDGcMFhR8 +1kw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:to:cc:references:from:organization :message-id:date:user-agent:mime-version:in-reply-to :content-language:content-transfer-encoding; bh=oEy5q2En1SJI6u34J14mPbz3ymhjWNLu2ImEmUAs9Ws=; b=ZinyYjlW9vDant4rZBgyOCZ9EsVt9NNqg/FwL6y6ji3k4sQ7U+6xiKPmb8MfG2EIJ7 wNjQZ34tHV3V4u2po6lB0rEnq5/VCqiY6TMSjcZ1f16z8nN71eqRHSQwpVZ0HD45CFfc tt0dXA1Ba037CP8fydkCEXgePdaDlIY80nCR8MAcYTMGZiW/8zAWVcyImlbhLshSgd6J /7Rj2JdoHxvRnu73LzzHSHh1pW/mNKRkVq1xheOKoY+3BkOwtAYEJVgGTAm4DEnJgBMQ xPNPy4SA9MM22eNC+xWkbxITe+d7JhvRmdloCLs1CjSjsdFtALf13EmQoVsG9yH8PU8d MhSQ== X-Gm-Message-State: AOAM532XgLC5QItGFWpTUr0KQqyR6FCCWsKuSeo8apDEseiHecXf96l0 1eU+WogLAIIYmS0+YvARiwIV0A== X-Google-Smtp-Source: ABdhPJwFDDEDdU/s/zYaPx0ggHOsOr62MbBrECZawSaq4PlqyTZscFc4nlCfmRS2OLqWEFdp3N4DEA== X-Received: by 2002:a02:4c8:: with SMTP id 191mr1865300jab.70.1606370760006; Wed, 25 Nov 2020 22:06:00 -0800 (PST) Received: from independence.bos.jonmasters.org (Boston.jonmasters.org. [50.195.43.97]) by smtp.gmail.com with ESMTPSA id e18sm2531397ilc.52.2020.11.25.22.05.58 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 25 Nov 2020 22:05:59 -0800 (PST) Subject: Re: [RFC PATCH 5/9] cxl/mem: Find device capabilities To: Ben Widawsky , linux-cxl@vger.kernel.org Cc: linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org, linux-acpi@vger.kernel.org, Dan Williams , Ira Weiny , Vishal Verma , "Kelley, Sean V" , Bjorn Helgaas , "Rafael J . Wysocki" References: <20201111054356.793390-1-ben.widawsky@intel.com> <20201111054356.793390-6-ben.widawsky@intel.com> From: Jon Masters Organization: World Organi{s,z}ation of Broken Dreams Message-ID: <8d332852-9c54-95e0-58c7-72939f347aa6@jonmasters.org> Date: Thu, 26 Nov 2020 01:05:56 -0500 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.2.2 MIME-Version: 1.0 In-Reply-To: <20201111054356.793390-6-ben.widawsky@intel.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org On 11/11/20 12:43 AM, Ben Widawsky wrote: > + case CXL_CAPABILITIES_CAP_ID_SECONDARY_MAILBOX: > + dev_dbg(&cxlm->pdev->dev, > + "found UNSUPPORTED Secondary Mailbox capability\n"); Per spec, the secondary mailbox is intended for use by platform firmware, so Linux should never be using it anyway. Maybe that message is slightly misleading? Jon. P.S. Related - I've severe doubts about the mailbox approach being proposed by CXL and have begun to push back through the spec org. -- Computer Architect