From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752719AbeCEURA (ORCPT ); Mon, 5 Mar 2018 15:17:00 -0500 Received: from ale.deltatee.com ([207.54.116.67]:35496 "EHLO ale.deltatee.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751275AbeCEUQ6 (ORCPT ); Mon, 5 Mar 2018 15:16:58 -0500 To: Jason Gunthorpe , Sagi Grimberg Cc: Jens Axboe , linux-block@vger.kernel.org, Benjamin Herrenschmidt , "linux-nvdimm@lists.01.org" , linux-rdma@vger.kernel.org, linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, linux-nvme@lists.infradead.org, Keith Busch , Alex Williamson , =?UTF-8?B?SsOpcsO0bWUgR2xpc3Nl?= , Bjorn Helgaas , Max Gurtovoy , Christoph Hellwig References: <20180228234006.21093-1-logang@deltatee.com> <20180228234006.21093-8-logang@deltatee.com> <20180305160004.GA30975@localhost.localdomain> <36c78987-006a-a97f-1d18-b0a08cbea9d4@grimberg.me> <20180305201053.GK11337@mellanox.com> From: Logan Gunthorpe Message-ID: <608840df-85a6-6d3b-70b4-43b037db58c9@deltatee.com> Date: Mon, 5 Mar 2018 13:16:52 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.6.0 MIME-Version: 1.0 In-Reply-To: <20180305201053.GK11337@mellanox.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit X-SA-Exim-Connect-IP: 172.16.1.162 X-SA-Exim-Rcpt-To: hch@lst.de, maxg@mellanox.com, bhelgaas@google.com, jglisse@redhat.com, alex.williamson@redhat.com, keith.busch@intel.com, linux-nvme@lists.infradead.org, linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org, linux-rdma@vger.kernel.org, linux-nvdimm@lists.01.org, benh@kernel.crashing.org, linux-block@vger.kernel.org, axboe@kernel.dk, sagi@grimberg.me, jgg@mellanox.com X-SA-Exim-Mail-From: logang@deltatee.com Subject: Re: [PATCH v2 07/10] nvme-pci: Use PCI p2pmem subsystem to manage the CMB X-SA-Exim-Version: 4.2.1 (built Tue, 02 Aug 2016 21:08:31 +0000) X-SA-Exim-Scanned: Yes (on ale.deltatee.com) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 05/03/18 01:10 PM, Jason Gunthorpe wrote: > So when reading the above mlx code, we see the first wmb() being used > to ensure that CPU stores to cachable memory are visible to the DMA > triggered by the doorbell ring. Oh, yes, that makes sense. Disregard my previous email as I was wrong. Logan