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From: Logan Gunthorpe <logang@deltatee.com>
To: Kit Chow <kchow@gigaio.com>, Eric Pilmore <epilmore@gigaio.com>
Cc: Bjorn Helgaas <helgaas@kernel.org>,
	linux-pci@vger.kernel.org, David Woodhouse <dwmw2@infradead.org>,
	Alex Williamson <alex.williamson@redhat.com>,
	iommu@lists.linux-foundation.org
Subject: Re: IOAT DMA w/IOMMU
Date: Thu, 16 Aug 2018 11:21:44 -0600	[thread overview]
Message-ID: <0d3f48c3-8c4f-4dfb-e883-23c168f12b9b@deltatee.com> (raw)
In-Reply-To: <695826a6-e10c-5a30-a51f-7cc61ba6e640@gigaio.com>



On 16/08/18 11:16 AM, Kit Chow wrote:
> I only have access to intel hosts for testing (and possibly an AMD
> host currently collecting dust) and am not sure how to go about getting
> the proper test coverage for other architectures.

Well, I thought you were only changing the Intel IOMMU implementation...
So testing on Intel hardware seems fine to me.

> Any suggestions? Do you anticipate any issues with dma mapping the pci bar
> address in ntb_async_tx_submit on non-x86 archs?  Do you or know of folks
> who have ntb test setups with non-x86 hosts who might be able to help?

I expect other IOMMUs will need to be updated to properly support
dma_map_resource but that will probably need to be done on a case by
case basis as the need arises. Unfortunately it seems the work to add
dma_map_resource() didn't really consider that the IOMMUs had to have
proper support and probably should have errored out instead of just
passing along the physical address if the IOMMU didn't have support.

I don't know of anyone with an NTB setup on anything but x86 at the moment.

Logan

  reply	other threads:[~2018-08-16 17:21 UTC|newest]

Thread overview: 48+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-08-09 18:14 IOAT DMA w/IOMMU Eric Pilmore
2018-08-09 18:43 ` Bjorn Helgaas
2018-08-09 18:51   ` Eric Pilmore
2018-08-09 19:35     ` Logan Gunthorpe
2018-08-09 19:47       ` Kit Chow
2018-08-09 20:11         ` Logan Gunthorpe
2018-08-09 20:57           ` Kit Chow
2018-08-09 21:11             ` Logan Gunthorpe
2018-08-09 21:47               ` Kit Chow
2018-08-09 22:40                 ` Jiang, Dave
2018-08-09 22:48                   ` Kit Chow
2018-08-09 22:50                     ` Logan Gunthorpe
2018-08-09 23:00                       ` Kit Chow
2018-08-10 16:02                         ` Kit Chow
2018-08-10 16:23                           ` Kit Chow
2018-08-10 16:24                             ` Logan Gunthorpe
2018-08-10 16:24                           ` Logan Gunthorpe
2018-08-10 16:31                             ` Dave Jiang
2018-08-10 16:33                               ` Logan Gunthorpe
2018-08-10 17:01                                 ` Dave Jiang
2018-08-10 17:15                                   ` Logan Gunthorpe
2018-08-10 17:46                                     ` Dave Jiang
2018-08-11  0:53                                       ` Kit Chow
2018-08-11  2:10                                         ` Logan Gunthorpe
2018-08-13 14:23                                           ` Kit Chow
2018-08-13 14:59                                             ` Robin Murphy
2018-08-13 15:21                                               ` Kit Chow
2018-08-13 23:30                                                 ` Kit Chow
2018-08-13 23:39                                                   ` Logan Gunthorpe
2018-08-13 23:48                                                     ` Kit Chow
2018-08-13 23:50                                                       ` Logan Gunthorpe
2018-08-14 13:47                                                         ` Kit Chow
2018-08-14 14:03                                                         ` Robin Murphy
2018-08-13 23:36                                                 ` Kit Chow
2018-08-09 21:31       ` Eric Pilmore
2018-08-09 21:36         ` Logan Gunthorpe
2018-08-16 17:16           ` Kit Chow
2018-08-16 17:21             ` Logan Gunthorpe [this message]
2018-08-16 18:53               ` Kit Chow
2018-08-16 18:56                 ` Logan Gunthorpe
2018-08-21 23:18                   ` Eric Pilmore
2018-08-21 23:20                     ` Logan Gunthorpe
2018-08-21 23:28                       ` Eric Pilmore
2018-08-21 23:35                         ` Logan Gunthorpe
2018-08-21 23:45                           ` Eric Pilmore
2018-08-21 23:53                             ` Logan Gunthorpe
2018-08-21 23:59                               ` Eric Pilmore
2018-08-21 23:30                       ` Eric Pilmore

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