Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
Date:   Fri, 19 Feb 2021 19:54:44 -0500
From:   Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
To:     Ben Widawsky <ben.widawsky@intel.com>
Cc:     linux-cxl@vger.kernel.org, linux-acpi@vger.kernel.org,
        linux-kernel@vger.kernel.org, linux-nvdimm@lists.01.org,
        linux-pci@vger.kernel.org, Bjorn Helgaas <helgaas@kernel.org>,
        Chris Browy <cbrowy@avery-design.com>,
        Christoph Hellwig <hch@infradead.org>,
        Dan Williams <dan.j.williams@intel.com>,
        David Hildenbrand <david@redhat.com>,
        David Rientjes <rientjes@google.com>,
        Ira Weiny <ira.weiny@intel.com>,
        Jon Masters <jcm@jonmasters.org>,
        Jonathan Cameron <Jonathan.Cameron@Huawei.com>,
        Rafael Wysocki <rafael.j.wysocki@intel.com>,
        Randy Dunlap <rdunlap@infradead.org>,
        Vishal Verma <vishal.l.verma@intel.com>,
        "John Groves (jgroves)" <jgroves@micron.com>,
        "Kelley, Sean V" <sean.v.kelley@intel.com>,
        Jonathan Corbet <corbet@lwn.net>
Subject: Re: [PATCH v5 1/9] cxl/mem: Introduce a driver for CXL-2.0-Type-3
 endpoints
Message-ID: <YDBd1J98VJM0dLvE@Konrads-MacBook-Pro.local>
References: <20210217040958.1354670-1-ben.widawsky@intel.com>
 <20210217040958.1354670-2-ben.widawsky@intel.com>
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <20210217040958.1354670-2-ben.widawsky@intel.com>
MIME-Version: 1.0
X-MS-Exchange-MessageSentRepresentingType: 1
Received: from Konrads-MacBook-Pro.local (209.6.208.110) by SN4PR0501CA0034.namprd05.prod.outlook.com (2603:10b6:803:40::47) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3890.11 via Frontend Transport; Sat, 20 Feb 2021 00:54:46 +0000
X-MS-PublicTrafficType: Email
X-MS-Office365-Filtering-Correlation-Id: 65c47051-b1c3-4260-64a6-08d8d53a1fdc
X-MS-TrafficTypeDiagnostic: BYAPR10MB2551:
X-Microsoft-Antispam-PRVS: <BYAPR10MB2551DDB86FC97148F322186089839@BYAPR10MB2551.namprd10.prod.outlook.com>
X-MS-Oob-TLC-OOBClassifiers: OLM:8882;
X-MS-Exchange-SenderADCheck: 1
X-Microsoft-Antispam: BCL:0;
X-Microsoft-Antispam-Message-Info: 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
X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:BYAPR10MB2999.namprd10.prod.outlook.com;PTR:;CAT:NONE;SFS:(366004)(346002)(39860400002)(396003)(376002)(136003)(6506007)(26005)(5660300002)(4326008)(956004)(66946007)(16526019)(83380400001)(52116002)(7416002)(186003)(2906002)(8676002)(66476007)(8936002)(478600001)(316002)(7696005)(966005)(86362001)(66556008)(54906003)(9686003)(6916009)(55016002);DIR:OUT;SFP:1101;
X-MS-Exchange-AntiSpam-MessageData: =?us-ascii?Q?v1khhlDI+IQUVEaM598yURUL+0Gm6EU3rcoOMjQfRciaSNI1OZJjbnGCwmSc?=
 =?us-ascii?Q?eVKWz6FgJDvzBxIFqui8evKNTY7uBinenwECmTRtopdKgU9zkQbFI3u12jSC?=
 =?us-ascii?Q?EByQ3l4cdU+IsM+d96dGVAz3xO3v3IM6Ycox/6iJ9PJgL66TvIp46t9saRd1?=
 =?us-ascii?Q?M0/kVkkXWXamRhDRf7nHm/qIMaPpXaE7RFiyw9LxSClsSx1Rg+EkPWH6h2sm?=
 =?us-ascii?Q?dCIn5o6I9TLy7731bWGUKHe63DcdOtUz/IrTFf8ORELJ58Eiy8tVCa9nwY6A?=
 =?us-ascii?Q?ru9G2I/iKHo9HNR1R/zPHyRxbt1IIJG75nkVrY8TQFaGcbMRG0AJImiZpyBb?=
 =?us-ascii?Q?Dgbthx2ea8wM3zqM/j2hGwIf1xR5Q/oyRHmuPlPzmqca1Oa4Ae17Mc3c7ARO?=
 =?us-ascii?Q?wcJAma3Nuhlag4EqcU3OnRvnofi7E4OlUF4F1kUPehM3rKZCnnQO2+ww8wqb?=
 =?us-ascii?Q?J2cppZHMgXbwhOCpBwJEVQHWtCfxj5lH6JbWEVz5VAXEnkGyRe7sIVzGr7Pk?=
 =?us-ascii?Q?KAJCvWjU9sI1BJ/buXVGvwZpT9bi/qiB+QnzBrEhDpEqem8ZrjMBG6gbUcjL?=
 =?us-ascii?Q?AcNvH9kzurafvEqxmnp9hXEuAZjBqnf9547rd1BsimLINCEfm28SRmXHgYOe?=
 =?us-ascii?Q?bSSC1MLD8pw8OickSMk8oFdDy7W+6sAcih/gPMwyv/PFbVGi6XNd0Quzh+5W?=
 =?us-ascii?Q?N9uLVkLq0WQUbsrN0Z1mF9k5B0wrDucWi+YCtx8bBxmYnccgeTPn1wCy+uZ5?=
 =?us-ascii?Q?/nLHWL+Gk2DP++hGXHVU/OA6LhneXxUslrcTA/8F37HZjd72AbpZZO+ivJLY?=
 =?us-ascii?Q?SPkOd8J0lztehn6efxZ5eBMhRfUjwPhYTVOMeugvjR3Xvs2P8VxjRsrVd1X6?=
 =?us-ascii?Q?NQu1jDwz2ub9tjMg1jbWRZRmt4L7yc+pOndsIZgxr+28NZH2I76nHqVk/+BK?=
 =?us-ascii?Q?dGLKvUZbcEbwIQxagHHSNxK8LD2h1LonkkPNKMsinZsB7FyfEQJMq58Y9qhs?=
 =?us-ascii?Q?euLamJiWbgGc+oJ5I+w1ABdwzHNY9CkSbPfB65048hil/6iLdkbEeiYmj95a?=
 =?us-ascii?Q?XYwFmrs/TsEKrQ//qnfIE9tqoOjAMPXI7y7966ZT8AfM6+z0s1CSYgOIHcXk?=
 =?us-ascii?Q?4KKd92NFJiD/mz6GzyEf/oQK7TUZcvH1GbA7+zJZwezUj/WYZZGzL29ZbL4r?=
 =?us-ascii?Q?RlimhMLVrLhcgc4YAEiq6cOhfrZ/voFuMDgYMz6JZkvO7NWoEz4IGN6n8nn4?=
 =?us-ascii?Q?VOcKFh0YzsEjZLsTOu3P1ZRrCDdGTlFdeR0fI8RvwVfyGudY8VYy+Uea0iY+?=
 =?us-ascii?Q?V6awvuBmwZYDxL7PwRWGTJbb?=
X-OriginatorOrg: oracle.com
X-MS-Exchange-CrossTenant-Network-Message-Id: 65c47051-b1c3-4260-64a6-08d8d53a1fdc
X-MS-Exchange-CrossTenant-AuthSource: BYAPR10MB2999.namprd10.prod.outlook.com
X-MS-Exchange-CrossTenant-AuthAs: Internal
X-MS-Exchange-CrossTenant-OriginalArrivalTime: 20 Feb 2021 00:54:49.3771
 (UTC)
X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted
X-MS-Exchange-CrossTenant-Id: 4e2c6054-71cb-48f1-bd6c-3a9705aca71b
X-MS-Exchange-CrossTenant-MailboxType: HOSTED
X-MS-Exchange-CrossTenant-UserPrincipalName: nPlCvED8JPGtSZXpQlMyEPzdhxr9z1MGHMtGu2hE+j7fWmGmaZTR5U47nhGCMNMwQs5lMvRXzo5c17vWp0wOWw==
X-MS-Exchange-Transport-CrossTenantHeadersStamped: BYAPR10MB2551
X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=9900 signatures=668683
X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 mlxlogscore=999 adultscore=0 mlxscore=0
 bulkscore=0 suspectscore=0 malwarescore=0 spamscore=0 phishscore=0
 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2009150000
 definitions=main-2102200002
X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=9900 signatures=668683
X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 lowpriorityscore=0 suspectscore=0
 impostorscore=0 priorityscore=1501 clxscore=1015 spamscore=0 mlxscore=0
 phishscore=0 malwarescore=0 bulkscore=0 adultscore=0 mlxlogscore=999
 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2009150000
 definitions=main-2102200002
Precedence: bulk
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

On Tue, Feb 16, 2021 at 08:09:50PM -0800, Ben Widawsky wrote:
> From: Dan Williams <dan.j.williams@intel.com>
> 
> The CXL.mem protocol allows a device to act as a provider of "System
> RAM" and/or "Persistent Memory" that is fully coherent as if the memory
> was attached to the typical CPU memory controller.
> 
> With the CXL-2.0 specification a PCI endpoint can implement a "Type-3"
> device interface and give the operating system control over "Host
> Managed Device Memory". See section 2.3 Type 3 CXL Device.
> 
> The memory range exported by the device may optionally be described by
> the platform firmware memory map, or by infrastructure like LIBNVDIMM to
> provision persistent memory capacity from one, or more, CXL.mem devices.
> 
> A pre-requisite for Linux-managed memory-capacity provisioning is this
> cxl_mem driver that can speak the mailbox protocol defined in section
> 8.2.8.4 Mailbox Registers.
> 
> For now just land the initial driver boiler-plate and Documentation/
> infrastructure.
> 
> Link: https://www.computeexpresslink.org/download-the-specification
> Cc: Jonathan Corbet <corbet@lwn.net>
> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
> Signed-off-by: Ben Widawsky <ben.widawsky@intel.com>
> Acked-by: David Rientjes <rientjes@google.com> (v1)
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>

Albeit you may want to modify 2020 to 2021 in the Copyright sections.