From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from ale.deltatee.com (ale.deltatee.com [207.54.116.67]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ml01.01.org (Postfix) with ESMTPS id 1B34B224C0F51 for ; Thu, 1 Mar 2018 13:31:48 -0800 (PST) References: <20180228234006.21093-1-logang@deltatee.com> <20180228234006.21093-5-logang@deltatee.com> <20180301180257.GH13722@bhelgaas-glaptop.roam.corp.google.com> <0D05579B-789C-4A19-B3A2-C1A630BE31C0@raithlin.com> <20180301142155.5966c4c0@w520.home> <20180301213533.GE6742@redhat.com> From: Logan Gunthorpe Message-ID: <0f33b4ec-6d1c-779a-c2cd-82d6ceb4991b@deltatee.com> Date: Thu, 1 Mar 2018 14:37:48 -0700 MIME-Version: 1.0 In-Reply-To: <20180301213533.GE6742@redhat.com> Content-Language: en-US Subject: Re: [PATCH v2 04/10] PCI/P2PDMA: Clear ACS P2P flags for all devices behind switches List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed" Errors-To: linux-nvdimm-bounces@lists.01.org Sender: "Linux-nvdimm" To: Jerome Glisse , Stephen Bates Cc: Jens Axboe , Keith Busch , "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" , "linux-block@vger.kernel.org" , Alex Williamson , Jason Gunthorpe , Bjorn Helgaas , Benjamin Herrenschmidt , Bjorn Helgaas , Max Gurtovoy , Christoph Hellwig List-ID: On 01/03/18 02:35 PM, Jerome Glisse wrote: > Note that they are usecase for P2P where IOMMU isolation matter and > the traffic through root complex isn't see as an issue. Well, we can worry about that once we have a solution to the problem of knowing whether a root complex supports P2P at all. I'm not sure how people are going to solve that one. For the time being, this work is for cards behind a switch only. Logan _______________________________________________ Linux-nvdimm mailing list Linux-nvdimm@lists.01.org https://lists.01.org/mailman/listinfo/linux-nvdimm From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: To: Jerome Glisse , Stephen Bates Cc: Alex Williamson , Bjorn Helgaas , "linux-kernel@vger.kernel.org" , "linux-pci@vger.kernel.org" , "linux-nvme@lists.infradead.org" , "linux-rdma@vger.kernel.org" , "linux-nvdimm@lists.01.org" , "linux-block@vger.kernel.org" , Christoph Hellwig , Jens Axboe , Keith Busch , Sagi Grimberg , Bjorn Helgaas , Jason Gunthorpe , Max Gurtovoy , Dan Williams , Benjamin Herrenschmidt References: <20180228234006.21093-1-logang@deltatee.com> <20180228234006.21093-5-logang@deltatee.com> <20180301180257.GH13722@bhelgaas-glaptop.roam.corp.google.com> <0D05579B-789C-4A19-B3A2-C1A630BE31C0@raithlin.com> <20180301142155.5966c4c0@w520.home> <20180301213533.GE6742@redhat.com> From: Logan Gunthorpe Message-ID: <0f33b4ec-6d1c-779a-c2cd-82d6ceb4991b@deltatee.com> Date: Thu, 1 Mar 2018 14:37:48 -0700 MIME-Version: 1.0 In-Reply-To: <20180301213533.GE6742@redhat.com> Content-Type: text/plain; charset=utf-8; format=flowed Subject: Re: [PATCH v2 04/10] PCI/P2PDMA: Clear ACS P2P flags for all devices behind switches List-ID: On 01/03/18 02:35 PM, Jerome Glisse wrote: > Note that they are usecase for P2P where IOMMU isolation matter and > the traffic through root complex isn't see as an issue. Well, we can worry about that once we have a solution to the problem of knowing whether a root complex supports P2P at all. I'm not sure how people are going to solve that one. For the time being, this work is for cards behind a switch only. Logan From mboxrd@z Thu Jan 1 00:00:00 1970 From: Logan Gunthorpe Subject: Re: [PATCH v2 04/10] PCI/P2PDMA: Clear ACS P2P flags for all devices behind switches Date: Thu, 1 Mar 2018 14:37:48 -0700 Message-ID: <0f33b4ec-6d1c-779a-c2cd-82d6ceb4991b@deltatee.com> References: <20180228234006.21093-1-logang@deltatee.com> <20180228234006.21093-5-logang@deltatee.com> <20180301180257.GH13722@bhelgaas-glaptop.roam.corp.google.com> <0D05579B-789C-4A19-B3A2-C1A630BE31C0@raithlin.com> <20180301142155.5966c4c0@w520.home> <20180301213533.GE6742@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii"; Format="flowed" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <20180301213533.GE6742-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org> Content-Language: en-US List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: linux-nvdimm-bounces-hn68Rpc1hR1g9hUCZPvPmw@public.gmane.org Sender: "Linux-nvdimm" To: Jerome Glisse , Stephen Bates Cc: Jens Axboe , Keith Busch , "linux-nvdimm-hn68Rpc1hR1g9hUCZPvPmw@public.gmane.org" , "linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org" , "linux-pci-u79uwXL29TY76Z2rM5mHXA@public.gmane.org" , "linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org" , "linux-nvme-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org" , "linux-block-u79uwXL29TY76Z2rM5mHXA@public.gmane.org" , Alex Williamson , Jason Gunthorpe , Bjorn Helgaas , Benjamin Herrenschmidt , Bjorn Helgaas , Max Gurtovoy , Christoph Hellwig List-Id: linux-rdma@vger.kernel.org On 01/03/18 02:35 PM, Jerome Glisse wrote: > Note that they are usecase for P2P where IOMMU isolation matter and > the traffic through root complex isn't see as an issue. Well, we can worry about that once we have a solution to the problem of knowing whether a root complex supports P2P at all. I'm not sure how people are going to solve that one. For the time being, this work is for cards behind a switch only. Logan From mboxrd@z Thu Jan 1 00:00:00 1970 From: logang@deltatee.com (Logan Gunthorpe) Date: Thu, 1 Mar 2018 14:37:48 -0700 Subject: [PATCH v2 04/10] PCI/P2PDMA: Clear ACS P2P flags for all devices behind switches In-Reply-To: <20180301213533.GE6742@redhat.com> References: <20180228234006.21093-1-logang@deltatee.com> <20180228234006.21093-5-logang@deltatee.com> <20180301180257.GH13722@bhelgaas-glaptop.roam.corp.google.com> <0D05579B-789C-4A19-B3A2-C1A630BE31C0@raithlin.com> <20180301142155.5966c4c0@w520.home> <20180301213533.GE6742@redhat.com> Message-ID: <0f33b4ec-6d1c-779a-c2cd-82d6ceb4991b@deltatee.com> On 01/03/18 02:35 PM, Jerome Glisse wrote: > Note that they are usecase for P2P where IOMMU isolation matter and > the traffic through root complex isn't see as an issue. Well, we can worry about that once we have a solution to the problem of knowing whether a root complex supports P2P at all. I'm not sure how people are going to solve that one. For the time being, this work is for cards behind a switch only. Logan