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From: "Stephen  Bates" <sbates@raithlin.com>
To: Jonathan Cameron <Jonathan.Cameron@huawei.com>,
	Logan Gunthorpe <logang@deltatee.com>
Cc: "Jens Axboe" <axboe@kernel.dk>,
	"linux-block@vger.kernel.org" <linux-block@vger.kernel.org>,
	"Alex Williamson" <alex.williamson@redhat.com>,
	"linux-nvdimm@lists.01.org" <linux-nvdimm@lists.01.org>,
	"linux-rdma@vger.kernel.org" <linux-rdma@vger.kernel.org>,
	"linux-pci@vger.kernel.org" <linux-pci@vger.kernel.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"linux-nvme@lists.infradead.org" <linux-nvme@lists.infradead.org>,
	"Sinan Kaya" <okaya@codeaurora.org>,
	"Jérôme Glisse" <jglisse@redhat.com>,
	"Jason Gunthorpe" <jgg@mellanox.com>,
	"Bjorn Helgaas" <helgaas@kernel.org>,
	"Benjamin Herrenschmidt" <benh@kernel.crashing.org>,
	"Bjorn Helgaas" <bhelgaas@google.com>,
	"Max Gurtovoy" <maxg@mellanox.com>,
	"Keith Busch" <keith.busch@intel.com>,
	"Eric Wehage" <Eric.Wehage@huawei.com>,
	"Christoph Hellwig" <hch@lst.de>
Subject: Re: [PATCH v3 01/11] PCI/P2PDMA: Support peer-to-peer memory
Date: Fri, 13 Apr 2018 21:56:06 +0000	[thread overview]
Message-ID: <178FD8FA-53BA-49DA-807F-F8736157F179@raithlin.com> (raw)
In-Reply-To: <20180327094701.0000300d@huawei.com>

 
>  I'll see if I can get our PCI SIG people to follow this through 

Hi Jonathan

Can you let me know if this moves forward within PCI-SIG? I would like to track it. I can see this being doable between Root Ports that reside in the same Root Complex but might become more challenging to standardize for RPs that reside in different RCs in the same (potentially multi-socket) system. I know in the past we have seem MemWr TLPS cross the QPI bus in Intel systems but I am sure that is not something that would work in all systems and must fall outside the remit of PCI-SIG ;-).

I agree such a capability bit would be very useful but it's going to be quite some time before we can rely on hardware being available that supports it.

Stephen
    

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  parent reply	other threads:[~2018-04-13 21:56 UTC|newest]

Thread overview: 68+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-03-12 19:35 [PATCH v3 00/11] Copy Offload in NVMe Fabrics with P2P PCI Memory Logan Gunthorpe
2018-03-12 19:35 ` [PATCH v3 01/11] PCI/P2PDMA: Support peer-to-peer memory Logan Gunthorpe
2018-03-13  3:28   ` Sinan Kaya
2018-03-13 16:43     ` Logan Gunthorpe
2018-03-13 17:49       ` Sinan Kaya
2018-03-13 18:44         ` Logan Gunthorpe
2018-03-13 19:10           ` Sinan Kaya
2018-03-13 19:19             ` Logan Gunthorpe
2018-03-13 19:53               ` Sinan Kaya
2018-03-13 20:46                 ` Logan Gunthorpe
2018-03-13 21:22                   ` Sinan Kaya
2018-03-13 22:00                     ` Logan Gunthorpe
2018-03-13 22:29                       ` Sinan Kaya
2018-03-13 22:45                         ` Stephen  Bates
2018-03-13 22:48                         ` Logan Gunthorpe
2018-03-13 23:19                           ` Sinan Kaya
2018-03-13 23:45                             ` Logan Gunthorpe
2018-03-14 12:16                               ` David Laight
2018-03-14 16:23                                 ` Logan Gunthorpe
2018-03-13 22:31                       ` Stephen  Bates
2018-03-13 23:08                         ` Bjorn Helgaas
2018-03-13 23:21                           ` Logan Gunthorpe
2018-03-14  2:56                             ` Bjorn Helgaas
2018-03-14 14:05                               ` Stephen  Bates
2018-03-14 16:17                               ` Logan Gunthorpe
2018-03-14 18:51                                 ` Bjorn Helgaas
2018-03-14 19:03                                   ` Logan Gunthorpe
2018-03-14 19:28                                     ` Dan Williams
2018-03-14 19:30                                       ` Logan Gunthorpe
2018-03-14 19:34                                       ` Stephen  Bates
2018-03-15  4:00                                         ` Martin K. Petersen
2018-03-15  4:30                                         ` Dan Williams
2018-03-22 22:57                           ` Stephen  Bates
2018-03-23 21:50                             ` Bjorn Helgaas
2018-03-23 21:59                               ` Logan Gunthorpe
2018-03-24  3:49                                 ` Bjorn Helgaas
2018-03-24 15:28                                   ` Stephen  Bates
2018-03-26 15:43                                     ` Logan Gunthorpe
2018-03-26 11:11       ` Jonathan Cameron
2018-03-26 14:01         ` Bjorn Helgaas
2018-03-26 15:46           ` Logan Gunthorpe
2018-03-27  8:47             ` Jonathan Cameron
2018-03-27 15:37               ` Logan Gunthorpe
2018-04-13 21:56               ` Stephen  Bates [this message]
2018-03-26 16:41         ` Jason Gunthorpe
2018-03-26 17:30           ` Logan Gunthorpe
2018-03-26 19:35             ` Jason Gunthorpe
2018-03-26 20:42               ` Logan Gunthorpe
2018-03-13 18:40     ` Logan Gunthorpe
2018-03-12 19:35 ` [PATCH v3 02/11] PCI/P2PDMA: Add sysfs group to display p2pmem stats Logan Gunthorpe
2018-03-12 19:35 ` [PATCH v3 03/11] PCI/P2PDMA: Add PCI p2pmem dma mappings to adjust the bus offset Logan Gunthorpe
2018-03-12 19:35 ` [PATCH v3 04/11] PCI/P2PDMA: Clear ACS P2P flags for all devices behind switches Logan Gunthorpe
2018-03-12 19:35 ` [PATCH v3 05/11] PCI/P2PDMA: Add P2P DMA driver writer's documentation Logan Gunthorpe
2018-03-12 19:41   ` Jonathan Corbet
2018-03-12 21:18     ` Logan Gunthorpe
2018-03-12 19:35 ` [PATCH v3 06/11] block: Introduce PCI P2P flags for request and request queue Logan Gunthorpe
2018-03-21  9:27   ` Christoph Hellwig
2018-03-12 19:35 ` [PATCH v3 07/11] IB/core: Ensure we map P2P memory correctly in rdma_rw_ctx_[init|destroy]() Logan Gunthorpe
2018-03-21  9:27   ` Christoph Hellwig
2018-03-12 19:35 ` [PATCH v3 08/11] nvme-pci: Use PCI p2pmem subsystem to manage the CMB Logan Gunthorpe
2018-03-13  1:55   ` Sinan Kaya
2018-03-13  1:58     ` Sinan Kaya
2018-03-12 19:35 ` [PATCH v3 09/11] nvme-pci: Add support for P2P memory in requests Logan Gunthorpe
2018-03-21  9:23   ` Christoph Hellwig
2018-03-12 19:35 ` [PATCH v3 10/11] nvme-pci: Add a quirk for a pseudo CMB Logan Gunthorpe
2018-03-12 19:35 ` [PATCH v3 11/11] nvmet: Optionally use PCI P2P memory Logan Gunthorpe
2018-03-21  9:27   ` Christoph Hellwig
2018-03-21 16:52     ` Logan Gunthorpe

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