From: Christoph Hellwig <hch@lst.de>
To: Jason Gunthorpe <jgg@mellanox.com>
Cc: Logan Gunthorpe <logang@deltatee.com>,
Jerome Glisse <jglisse@redhat.com>,
"linux-mm@kvack.org" <linux-mm@kvack.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
"Rafael J . Wysocki" <rafael@kernel.org>,
Bjorn Helgaas <bhelgaas@google.com>,
Christian Koenig <christian.koenig@amd.com>,
Felix Kuehling <Felix.Kuehling@amd.com>,
"linux-pci@vger.kernel.org" <linux-pci@vger.kernel.org>,
"dri-devel@lists.freedesktop.org"
<dri-devel@lists.freedesktop.org>, Christoph Hellwig <hch@lst.de>,
Marek Szyprowski <m.szyprowski@samsung.com>,
Robin Murphy <robin.murphy@arm.com>,
Joerg Roedel <jroedel@suse.de>,
"iommu@lists.linux-foundation.org"
<iommu@lists.linux-foundation.org>
Subject: Re: [RFC PATCH 3/5] mm/vma: add support for peer to peer to device vma
Date: Wed, 30 Jan 2019 09:00:06 +0100 [thread overview]
Message-ID: <20190130080006.GB29665@lst.de> (raw)
In-Reply-To: <20190130041841.GB30598@mellanox.com>
On Wed, Jan 30, 2019 at 04:18:48AM +0000, Jason Gunthorpe wrote:
> Every attempt to give BAR memory to struct page has run into major
> trouble, IMHO, so I like that this approach avoids that.
Way less problems than not having struct page for doing anything
non-trivial. If you map the BAR to userspace with remap_pfn_range
and friends the mapping is indeed very simple. But any operation
that expects a page structure, which is at least everything using
get_user_pages won't work.
So you can't do direct I/O to your remapped BAR, you can't create MRs
on it, etc, etc.
next prev parent reply other threads:[~2019-01-30 8:00 UTC|newest]
Thread overview: 121+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-01-29 17:47 [RFC PATCH 0/5] Device peer to peer (p2p) through vma jglisse
2019-01-29 17:47 ` jglisse
2019-01-29 17:47 ` [RFC PATCH 1/5] pci/p2p: add a function to test peer to peer capability jglisse
2019-01-29 18:24 ` Logan Gunthorpe
2019-01-29 19:44 ` Greg Kroah-Hartman
2019-01-29 19:44 ` Greg Kroah-Hartman
2019-01-29 19:53 ` Jerome Glisse
2019-01-29 20:44 ` Logan Gunthorpe
2019-01-29 21:00 ` Jerome Glisse
2019-01-29 21:00 ` Jerome Glisse
2019-01-29 19:56 ` Alex Deucher
2019-01-29 19:56 ` Alex Deucher
2019-01-29 20:00 ` Jerome Glisse
2019-01-29 20:24 ` Logan Gunthorpe
2019-01-29 21:28 ` Alex Deucher
2019-01-30 10:25 ` Christian König
2019-01-29 17:47 ` [RFC PATCH 2/5] drivers/base: " jglisse
2019-01-29 18:26 ` Logan Gunthorpe
2019-01-29 19:54 ` Jerome Glisse
2019-01-29 19:46 ` Greg Kroah-Hartman
2019-01-29 19:56 ` Jerome Glisse
2019-01-29 17:47 ` [RFC PATCH 3/5] mm/vma: add support for peer to peer to device vma jglisse
2019-01-29 18:36 ` Logan Gunthorpe
2019-01-29 19:11 ` Jerome Glisse
2019-01-29 19:24 ` Logan Gunthorpe
2019-01-29 19:44 ` Jerome Glisse
2019-01-29 20:43 ` Logan Gunthorpe
2019-01-30 7:52 ` Christoph Hellwig
2019-01-29 19:32 ` Jason Gunthorpe
2019-01-29 19:50 ` Jerome Glisse
2019-01-29 20:24 ` Jason Gunthorpe
2019-01-29 20:44 ` Jerome Glisse
2019-01-29 20:44 ` Jerome Glisse
2019-01-29 23:02 ` Jason Gunthorpe
2019-01-30 0:08 ` Jerome Glisse
2019-01-30 0:08 ` Jerome Glisse
2019-01-30 4:30 ` Jason Gunthorpe
2019-01-30 15:43 ` Jerome Glisse
2019-01-29 20:39 ` Logan Gunthorpe
2019-01-29 20:57 ` Jerome Glisse
2019-01-29 21:30 ` Logan Gunthorpe
2019-01-29 21:50 ` Jerome Glisse
2019-01-29 21:50 ` Jerome Glisse
2019-01-29 22:58 ` Logan Gunthorpe
2019-01-29 23:47 ` Jerome Glisse
2019-01-30 1:17 ` Logan Gunthorpe
2019-01-30 2:48 ` Jerome Glisse
2019-01-30 4:18 ` Jason Gunthorpe
2019-01-30 8:00 ` Christoph Hellwig [this message]
2019-01-30 15:49 ` Jerome Glisse
2019-01-30 19:06 ` Jason Gunthorpe
[not found] ` <20190130190651.GC17080-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
2019-01-30 19:45 ` Logan Gunthorpe
2019-01-30 19:45 ` Logan Gunthorpe
[not found] ` <840256f8-0714-5d7d-e5f5-c96aec5c2c05-OTvnGxWRz7hWk0Htik3J/w@public.gmane.org>
2019-01-30 19:59 ` Jason Gunthorpe
2019-01-30 19:59 ` Jason Gunthorpe
[not found] ` <20190130195900.GG17080-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
2019-01-30 21:01 ` Logan Gunthorpe
2019-01-30 21:01 ` Logan Gunthorpe
[not found] ` <35bad6d5-c06b-f2a3-08e6-2ed0197c8691-OTvnGxWRz7hWk0Htik3J/w@public.gmane.org>
2019-01-30 21:50 ` Jason Gunthorpe
2019-01-30 21:50 ` Jason Gunthorpe
[not found] ` <20190130215019.GL17080-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
2019-01-30 22:52 ` Logan Gunthorpe
2019-01-30 22:52 ` Logan Gunthorpe
2019-01-30 23:30 ` Jason Gunthorpe
2019-01-31 8:13 ` Christoph Hellwig
2019-01-31 15:37 ` Jerome Glisse
2019-01-31 19:02 ` Jason Gunthorpe
2019-01-31 19:19 ` Logan Gunthorpe
2019-01-31 19:54 ` Jason Gunthorpe
2019-01-31 19:35 ` Jerome Glisse
2019-01-31 19:44 ` Logan Gunthorpe
2019-01-31 19:58 ` Jason Gunthorpe
2019-01-30 17:17 ` Logan Gunthorpe
[not found] ` <bdf03cd5-f5b1-4b78-a40e-b24024ca8c9f-OTvnGxWRz7hWk0Htik3J/w@public.gmane.org>
2019-01-30 18:56 ` Jason Gunthorpe
2019-01-30 18:56 ` Jason Gunthorpe
[not found] ` <20190130185652.GB17080-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
2019-01-30 19:22 ` Jerome Glisse
2019-01-30 19:22 ` Jerome Glisse
2019-01-30 19:38 ` Jason Gunthorpe
[not found] ` <20190130193759.GE17080-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
2019-01-30 20:00 ` Logan Gunthorpe
2019-01-30 20:00 ` Logan Gunthorpe
2019-01-30 20:11 ` Jason Gunthorpe
2019-01-30 20:43 ` Jerome Glisse
[not found] ` <20190130204332.GF5061-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2019-01-30 20:50 ` Jason Gunthorpe
2019-01-30 20:50 ` Jason Gunthorpe
2019-01-30 21:45 ` Jerome Glisse
2019-01-30 21:45 ` Jerome Glisse
[not found] ` <20190130214525.GG5061-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2019-01-30 21:56 ` Jason Gunthorpe
2019-01-30 21:56 ` Jason Gunthorpe
2019-01-30 22:30 ` Jerome Glisse
2019-01-30 22:30 ` Jerome Glisse
[not found] ` <20190130223027.GH5061-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2019-01-30 22:33 ` Jason Gunthorpe
2019-01-30 22:33 ` Jason Gunthorpe
2019-01-30 22:47 ` Jerome Glisse
2019-01-30 22:47 ` Jerome Glisse
[not found] ` <20190130224705.GI5061-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2019-01-30 22:51 ` Jason Gunthorpe
2019-01-30 22:51 ` Jason Gunthorpe
2019-01-30 22:58 ` Jerome Glisse
2019-01-30 22:58 ` Jerome Glisse
[not found] ` <20190130192234.GD5061-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2019-01-30 19:52 ` Logan Gunthorpe
2019-01-30 19:52 ` Logan Gunthorpe
2019-01-30 20:35 ` Jerome Glisse
2019-01-29 20:58 ` Jason Gunthorpe
2019-01-30 8:02 ` Christoph Hellwig
2019-01-30 10:33 ` Koenig, Christian
2019-01-30 15:55 ` Jerome Glisse
2019-01-30 17:26 ` Christoph Hellwig
2019-01-30 17:32 ` Logan Gunthorpe
2019-01-30 17:39 ` Jason Gunthorpe
2019-01-30 18:05 ` Jerome Glisse
2019-01-30 17:44 ` Jason Gunthorpe
2019-01-30 18:13 ` Logan Gunthorpe
2019-01-30 18:50 ` Jerome Glisse
2019-01-31 8:02 ` Christoph Hellwig
2019-01-31 15:03 ` Jerome Glisse
2019-01-30 19:19 ` Jason Gunthorpe
[not found] ` <20190130191946.GD17080-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
2019-01-30 19:48 ` Logan Gunthorpe
2019-01-30 19:48 ` Logan Gunthorpe
2019-01-30 20:44 ` Jason Gunthorpe
2019-01-31 8:05 ` Christoph Hellwig
2019-01-31 15:11 ` Jerome Glisse
2019-01-29 17:47 ` [RFC PATCH 4/5] mm/hmm: add support for peer to peer to HMM device memory jglisse
2019-01-29 17:47 ` jglisse
2019-01-29 17:47 ` [RFC PATCH 5/5] mm/hmm: add support for peer to peer to special device vma jglisse
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