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From: "Stephen  Bates" <sbates@raithlin.com>
To: Alex Williamson <alex.williamson@redhat.com>
Cc: "Bjorn Helgaas" <helgaas@kernel.org>,
	"Logan Gunthorpe" <logang@deltatee.com>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"linux-pci@vger.kernel.org" <linux-pci@vger.kernel.org>,
	"linux-nvme@lists.infradead.org" <linux-nvme@lists.infradead.org>,
	"linux-rdma@vger.kernel.org" <linux-rdma@vger.kernel.org>,
	"linux-nvdimm@lists.01.org" <linux-nvdimm@lists.01.org>,
	"linux-block@vger.kernel.org" <linux-block@vger.kernel.org>,
	"Christoph Hellwig" <hch@lst.de>, "Jens Axboe" <axboe@kernel.dk>,
	"Keith Busch" <keith.busch@intel.com>,
	"Sagi Grimberg" <sagi@grimberg.me>,
	"Bjorn Helgaas" <bhelgaas@google.com>,
	"Jason Gunthorpe" <jgg@mellanox.com>,
	"Max Gurtovoy" <maxg@mellanox.com>,
	"Dan Williams" <dan.j.williams@intel.com>,
	"Jérôme Glisse" <jglisse@redhat.com>,
	"Benjamin Herrenschmidt" <benh@kernel.crashing.org>
Subject: Re: [PATCH v2 04/10] PCI/P2PDMA: Clear ACS P2P flags for all devices behind switches
Date: Thu, 1 Mar 2018 21:32:20 +0000	[thread overview]
Message-ID: <EE1B4EB7-D3C0-4916-81CE-E647222D03E4@raithlin.com> (raw)
In-Reply-To: <20180301142155.5966c4c0@w520.home>

> your kernel provider needs to decide whether they favor device assignment or p2p

Thanks Alex! The hardware requirements for P2P (switch, high performance EPs) are such that we really only expect CONFIG_P2P_DMA to be enabled in specific instances and in those instances the users have made a decision to favor P2P over IOMMU isolation. Or they have setup their PCIe topology in a way that gives them IOMMU isolation where they want it and P2P where they want it.

Stephen
 

  parent reply	other threads:[~2018-03-01 21:32 UTC|newest]

Thread overview: 124+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-02-28 23:39 [PATCH v2 00/10] Copy Offload in NVMe Fabrics with P2P PCI Memory Logan Gunthorpe
2018-02-28 23:39 ` [PATCH v2 01/10] PCI/P2PDMA: Support peer to peer memory Logan Gunthorpe
2018-03-01 17:37   ` Bjorn Helgaas
2018-03-01 18:55     ` Logan Gunthorpe
2018-03-01 23:00       ` Bjorn Helgaas
2018-03-01 23:06         ` Logan Gunthorpe
2018-03-01 23:14           ` Stephen  Bates
2018-03-01 23:45             ` Bjorn Helgaas
2018-02-28 23:39 ` [PATCH v2 02/10] PCI/P2PDMA: Add sysfs group to display p2pmem stats Logan Gunthorpe
2018-03-01 17:44   ` Bjorn Helgaas
2018-03-02  0:15     ` Logan Gunthorpe
2018-03-02  0:36       ` Dan Williams
2018-03-02  0:37         ` Logan Gunthorpe
2018-02-28 23:39 ` [PATCH v2 03/10] PCI/P2PDMA: Add PCI p2pmem dma mappings to adjust the bus offset Logan Gunthorpe
2018-03-01 17:49   ` Bjorn Helgaas
2018-03-01 19:36     ` Logan Gunthorpe
2018-02-28 23:40 ` [PATCH v2 04/10] PCI/P2PDMA: Clear ACS P2P flags for all devices behind switches Logan Gunthorpe
2018-03-01 18:02   ` Bjorn Helgaas
2018-03-01 18:54     ` Stephen  Bates
2018-03-01 21:21       ` Alex Williamson
2018-03-01 21:26         ` Logan Gunthorpe
2018-03-01 21:32         ` Stephen  Bates [this message]
2018-03-01 21:35           ` Jerome Glisse
2018-03-01 21:37             ` Logan Gunthorpe
2018-03-01 23:15       ` Bjorn Helgaas
2018-03-01 23:59         ` Logan Gunthorpe
2018-03-01 19:13     ` Logan Gunthorpe
2018-03-05 22:28       ` Bjorn Helgaas
2018-03-05 23:01         ` Logan Gunthorpe
2018-02-28 23:40 ` [PATCH v2 05/10] block: Introduce PCI P2P flags for request and request queue Logan Gunthorpe
2018-03-01 11:08   ` Sagi Grimberg
2018-02-28 23:40 ` [PATCH v2 06/10] IB/core: Add optional PCI P2P flag to rdma_rw_ctx_[init|destroy]() Logan Gunthorpe
2018-03-01 10:32   ` Sagi Grimberg
2018-03-01 17:16     ` Logan Gunthorpe
2018-02-28 23:40 ` [PATCH v2 07/10] nvme-pci: Use PCI p2pmem subsystem to manage the CMB Logan Gunthorpe
2018-03-05  1:33   ` Oliver
2018-03-05 16:00     ` Keith Busch
2018-03-05 17:10       ` Logan Gunthorpe
2018-03-05 18:02         ` Sinan Kaya
2018-03-05 18:09           ` Logan Gunthorpe
2018-03-06  0:49         ` Oliver
2018-03-06  1:14           ` Logan Gunthorpe
2018-03-06 10:40             ` Oliver
2018-03-05 19:57       ` Sagi Grimberg
2018-03-05 20:10         ` Jason Gunthorpe
2018-03-05 20:16           ` Logan Gunthorpe
2018-03-05 20:42           ` Keith Busch
2018-03-05 20:50             ` Jason Gunthorpe
2018-03-05 20:13         ` Logan Gunthorpe
2018-02-28 23:40 ` [PATCH v2 08/10] nvme-pci: Add support for P2P memory in requests Logan Gunthorpe
2018-03-01 11:07   ` Sagi Grimberg
2018-03-01 15:58     ` Stephen  Bates
2018-03-09  5:08       ` Bart Van Assche
2018-02-28 23:40 ` [PATCH v2 09/10] nvme-pci: Add a quirk for a pseudo CMB Logan Gunthorpe
2018-03-01 11:03   ` Sagi Grimberg
2018-02-28 23:40 ` [PATCH v2 10/10] nvmet: Optionally use PCI P2P memory Logan Gunthorpe
2018-03-01 11:03   ` Sagi Grimberg
2018-03-01 16:15     ` Stephen  Bates
2018-03-01 17:40     ` Logan Gunthorpe
2018-03-01 18:35       ` Sagi Grimberg
2018-03-01 18:42         ` Jason Gunthorpe
2018-03-01 19:01           ` Stephen  Bates
2018-03-01 19:27           ` Logan Gunthorpe
2018-03-01 22:45             ` Jason Gunthorpe
2018-03-01 22:56               ` Logan Gunthorpe
2018-03-01 23:00               ` Stephen  Bates
2018-03-01 23:20                 ` Jason Gunthorpe
2018-03-01 23:29                   ` Logan Gunthorpe
2018-03-01 23:32                   ` Stephen  Bates
2018-03-01 23:49                 ` Keith Busch
2018-03-01 23:52                   ` Logan Gunthorpe
2018-03-01 23:53                   ` Stephen  Bates
2018-03-02 15:53                     ` Christoph Hellwig
2018-03-02 20:51                       ` Stephen  Bates
2018-03-01 23:57                   ` Stephen  Bates
2018-03-02  0:03                     ` Logan Gunthorpe
2018-03-02 16:18                     ` Jason Gunthorpe
2018-03-02 17:10                       ` Logan Gunthorpe
2018-03-01 19:10         ` Logan Gunthorpe
2018-03-01  3:54 ` [PATCH v2 00/10] Copy Offload in NVMe Fabrics with P2P PCI Memory Benjamin Herrenschmidt
2018-03-01  3:56   ` Benjamin Herrenschmidt
2018-03-01 18:04     ` Logan Gunthorpe
2018-03-01 20:29       ` Benjamin Herrenschmidt
2018-03-01 20:55         ` Jerome Glisse
2018-03-01 21:03           ` Logan Gunthorpe
2018-03-01 21:10             ` Jerome Glisse
2018-03-01 21:15               ` Logan Gunthorpe
2018-03-01 21:25                 ` Jerome Glisse
2018-03-01 21:37               ` Stephen  Bates
2018-03-02 21:38               ` Stephen  Bates
2018-03-02 22:09                 ` Jerome Glisse
2018-03-05 20:36                   ` Stephen  Bates
2018-03-01 20:55         ` Logan Gunthorpe
2018-03-01 18:09     ` Stephen  Bates
2018-03-01 20:32       ` Benjamin Herrenschmidt
2018-03-01 19:21     ` Dan Williams
2018-03-01 19:30       ` Logan Gunthorpe
2018-03-01 20:34       ` Benjamin Herrenschmidt
2018-03-01 20:40         ` Benjamin Herrenschmidt
2018-03-01 20:53           ` Jason Gunthorpe
2018-03-01 20:57             ` Logan Gunthorpe
2018-03-01 22:06             ` Benjamin Herrenschmidt
2018-03-01 22:31               ` Linus Torvalds
2018-03-01 22:34                 ` Benjamin Herrenschmidt
2018-03-02 16:22                   ` Kani, Toshi
2018-03-02 16:57                     ` Linus Torvalds
2018-03-02 17:34                       ` Linus Torvalds
2018-03-02 17:38                       ` Kani, Toshi
2018-03-01 21:37         ` Dan Williams
2018-03-01 21:45           ` Logan Gunthorpe
2018-03-01 21:57             ` Logan Gunthorpe
2018-03-01 23:00               ` Benjamin Herrenschmidt
2018-03-01 23:19                 ` Logan Gunthorpe
2018-03-01 23:25                   ` Benjamin Herrenschmidt
2018-03-02 21:44                     ` Benjamin Herrenschmidt
2018-03-02 22:24                       ` Logan Gunthorpe
2018-03-01 23:26                   ` Benjamin Herrenschmidt
2018-03-01 23:54                     ` Logan Gunthorpe
2018-03-01 21:03       ` Benjamin Herrenschmidt
2018-03-01 21:11         ` Logan Gunthorpe
2018-03-01 21:18           ` Jerome Glisse
2018-03-01 21:22             ` Logan Gunthorpe
2018-03-01 10:31 ` Sagi Grimberg
2018-03-01 19:33   ` Logan Gunthorpe

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