From: David Woodhouse <dwmw2@infradead.org>
To: Dan Williams <dan.j.williams@intel.com>, linux-nvdimm@lists.01.org
Cc: Jan Kara <jack@suse.cz>, Ashok Raj <ashok.raj@intel.com>,
"Darrick J. Wong <darrick.wong@oracle.com>,
linux-rdma@vger.kernel.org,
Greg Kroah-Hartman" <gregkh@linuxfoundation.org>,
Joerg Roedel <joro@8bytes.org>,
Dave Chinner <david@fromorbit.com>,
linux-xfs@vger.kernel.org, linux-mm@kvack.org,
Jeff Moyer <jmoyer@redhat.com>,
linux-api@vger.kernel.org, linux-fsdevel@vger.kernel.org,
Ross Zwisler <ross.zwisler@linux.intel.com>,
Robin Murphy <robin.murphy@arm.com>,
Christoph Hellwig <hch@lst.de>,
Marek Szyprowski <m.szyprowski@samsung.com>
Subject: Re: [PATCH v7 07/12] dma-mapping: introduce dma_has_iommu()
Date: Fri, 06 Oct 2017 23:45:39 +0100 [thread overview]
Message-ID: <1507329939.29211.434.camel@infradead.org> (raw)
In-Reply-To: <150732935473.22363.1853399637339625023.stgit@dwillia2-desk3.amr.corp.intel.com>
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On Fri, 2017-10-06 at 15:35 -0700, Dan Williams wrote:
> Add a helper to determine if the dma mappings set up for a given device
> are backed by an iommu. In particular, this lets code paths know that a
> dma_unmap operation will revoke access to memory if the device can not
> otherwise be quiesced. The need for this knowledge is driven by a need
> to make RDMA transfers to DAX mappings safe. If the DAX file's block map
> changes we need to be to reliably stop accesses to blocks that have been
> freed or re-assigned to a new file.
"a dma_unmap operation revoke access to memory"... but it's OK that the
next *map* will give the same DMA address to someone else, right?
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next prev parent reply other threads:[~2017-10-06 22:45 UTC|newest]
Thread overview: 158+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-10-06 22:35 [PATCH v7 00/12] MAP_DIRECT for DAX RDMA and userspace flush Dan Williams
2017-10-06 22:35 ` Dan Williams
2017-10-06 22:35 ` Dan Williams
2017-10-06 22:35 ` Dan Williams
2017-10-06 22:35 ` [PATCH v7 01/12] mm: introduce MAP_SHARED_VALIDATE, a mechanism to safely define new mmap flags Dan Williams
2017-10-06 22:35 ` Dan Williams
2017-10-06 22:35 ` Dan Williams
2017-10-06 22:35 ` [PATCH v7 02/12] fs, mm: pass fd to ->mmap_validate() Dan Williams
2017-10-06 22:35 ` Dan Williams
2017-10-06 22:35 ` Dan Williams
2017-10-06 22:35 ` Dan Williams
2017-10-06 22:35 ` [PATCH v7 03/12] fs: introduce i_mapdcount Dan Williams
2017-10-06 22:35 ` Dan Williams
2017-10-06 22:35 ` Dan Williams
2017-10-09 3:08 ` Dave Chinner
2017-10-09 3:08 ` Dave Chinner
2017-10-09 3:08 ` Dave Chinner
2017-10-09 3:08 ` Dave Chinner
2017-10-06 22:35 ` [PATCH v7 04/12] fs: MAP_DIRECT core Dan Williams
2017-10-06 22:35 ` Dan Williams
2017-10-06 22:35 ` Dan Williams
2017-10-06 22:35 ` Dan Williams
2017-10-06 22:35 ` [PATCH v7 05/12] xfs: prepare xfs_break_layouts() for reuse with MAP_DIRECT Dan Williams
2017-10-06 22:35 ` Dan Williams
2017-10-06 22:35 ` Dan Williams
2017-10-06 22:35 ` [PATCH v7 06/12] xfs: wire up MAP_DIRECT Dan Williams
2017-10-06 22:35 ` Dan Williams
2017-10-06 22:35 ` Dan Williams
2017-10-09 3:40 ` Dave Chinner
2017-10-09 3:40 ` Dave Chinner
2017-10-09 3:40 ` Dave Chinner
2017-10-09 17:08 ` Dan Williams
2017-10-09 17:08 ` Dan Williams
2017-10-09 17:08 ` Dan Williams
2017-10-09 22:50 ` Dave Chinner
2017-10-09 22:50 ` Dave Chinner
2017-10-06 22:35 ` [PATCH v7 07/12] dma-mapping: introduce dma_has_iommu() Dan Williams
2017-10-06 22:35 ` Dan Williams
2017-10-06 22:35 ` Dan Williams
2017-10-06 22:45 ` David Woodhouse [this message]
2017-10-06 22:45 ` David Woodhouse
2017-10-06 22:45 ` David Woodhouse
2017-10-06 22:52 ` Dan Williams
2017-10-06 22:52 ` Dan Williams
2017-10-06 22:52 ` Dan Williams
2017-10-06 22:52 ` Dan Williams
2017-10-06 23:10 ` David Woodhouse
2017-10-06 23:10 ` David Woodhouse
2017-10-06 23:10 ` David Woodhouse
2017-10-06 23:15 ` Dan Williams
2017-10-06 23:15 ` Dan Williams
2017-10-06 23:15 ` Dan Williams
2017-10-06 23:15 ` Dan Williams
2017-10-07 11:08 ` David Woodhouse
2017-10-07 11:08 ` David Woodhouse
2017-10-07 23:33 ` Dan Williams
2017-10-07 23:33 ` Dan Williams
2017-10-07 23:33 ` Dan Williams
2017-10-07 23:33 ` Dan Williams
2017-10-06 23:12 ` Dan Williams
2017-10-06 23:12 ` Dan Williams
2017-10-08 3:45 ` [PATCH v8] dma-mapping: introduce dma_get_iommu_domain() Dan Williams
2017-10-08 3:45 ` Dan Williams
2017-10-08 3:45 ` Dan Williams
2017-10-09 10:37 ` Robin Murphy
2017-10-09 10:37 ` Robin Murphy
2017-10-09 10:37 ` Robin Murphy
2017-10-09 10:37 ` Robin Murphy
2017-10-09 17:32 ` Dan Williams
2017-10-09 17:32 ` Dan Williams
2017-10-10 14:40 ` Raj, Ashok
2017-10-10 14:40 ` Raj, Ashok
2017-10-09 18:58 ` [PATCH v7 07/12] dma-mapping: introduce dma_has_iommu() Jason Gunthorpe
2017-10-09 18:58 ` Jason Gunthorpe
2017-10-09 18:58 ` Jason Gunthorpe
2017-10-09 18:58 ` Jason Gunthorpe
2017-10-09 19:05 ` Dan Williams
2017-10-09 19:05 ` Dan Williams
2017-10-09 19:18 ` Jason Gunthorpe
2017-10-09 19:18 ` Jason Gunthorpe
2017-10-09 19:18 ` Jason Gunthorpe
2017-10-09 19:18 ` Jason Gunthorpe
2017-10-09 19:28 ` Dan Williams
2017-10-09 19:28 ` Dan Williams
2017-10-09 19:28 ` Dan Williams
2017-10-09 19:28 ` Dan Williams
2017-10-10 17:25 ` Jason Gunthorpe
2017-10-10 17:25 ` Jason Gunthorpe
2017-10-10 17:25 ` Jason Gunthorpe
2017-10-10 17:25 ` Jason Gunthorpe
2017-10-10 17:39 ` Dan Williams
2017-10-10 17:39 ` Dan Williams
2017-10-10 17:39 ` Dan Williams
2017-10-10 17:39 ` Dan Williams
2017-10-10 18:05 ` Jason Gunthorpe
2017-10-10 18:05 ` Jason Gunthorpe
2017-10-10 18:05 ` Jason Gunthorpe
2017-10-10 18:05 ` Jason Gunthorpe
2017-10-10 20:17 ` Dan Williams
2017-10-10 20:17 ` Dan Williams
2017-10-10 20:17 ` Dan Williams
2017-10-12 18:27 ` Jason Gunthorpe
2017-10-12 18:27 ` Jason Gunthorpe
2017-10-12 18:27 ` Jason Gunthorpe
2017-10-12 20:10 ` Dan Williams
2017-10-12 20:10 ` Dan Williams
2017-10-13 6:50 ` Christoph Hellwig
2017-10-13 6:50 ` Christoph Hellwig
2017-10-13 6:50 ` Christoph Hellwig
2017-10-13 15:03 ` Jason Gunthorpe
2017-10-13 15:03 ` Jason Gunthorpe
2017-10-13 15:03 ` Jason Gunthorpe
2017-10-13 15:03 ` Jason Gunthorpe
2017-10-15 15:14 ` Matan Barak
2017-10-15 15:14 ` Matan Barak
2017-10-15 15:14 ` Matan Barak
2017-10-15 15:14 ` Matan Barak
2017-10-15 15:21 ` Dan Williams
2017-10-15 15:21 ` Dan Williams
2017-10-15 15:21 ` Dan Williams
2017-10-13 7:09 ` Christoph Hellwig
2017-10-13 7:09 ` Christoph Hellwig
2017-10-13 7:09 ` Christoph Hellwig
2017-10-06 22:36 ` [PATCH v7 08/12] fs, mapdirect: introduce ->lease_direct() Dan Williams
2017-10-06 22:36 ` Dan Williams
2017-10-06 22:36 ` Dan Williams
2017-10-06 22:36 ` Dan Williams
2017-10-06 22:36 ` [PATCH v7 09/12] xfs: wire up ->lease_direct() Dan Williams
2017-10-06 22:36 ` Dan Williams
2017-10-06 22:36 ` Dan Williams
2017-10-09 3:45 ` Dave Chinner
2017-10-09 3:45 ` Dave Chinner
2017-10-09 3:45 ` Dave Chinner
2017-10-09 3:45 ` Dave Chinner
2017-10-09 17:10 ` Dan Williams
2017-10-09 17:10 ` Dan Williams
2017-10-06 22:36 ` [PATCH v7 10/12] device-dax: " Dan Williams
2017-10-06 22:36 ` Dan Williams
2017-10-06 22:36 ` Dan Williams
2017-10-06 22:36 ` Dan Williams
2017-10-06 22:36 ` [PATCH v7 11/12] IB/core: use MAP_DIRECT to fix / enable RDMA to DAX mappings Dan Williams
2017-10-06 22:36 ` Dan Williams
2017-10-06 22:36 ` Dan Williams
2017-10-08 4:02 ` [PATCH v8 1/2] iommu: up-level sg_num_pages() from amd-iommu Dan Williams
2017-10-08 4:02 ` Dan Williams
2017-10-08 4:02 ` Dan Williams
2017-10-08 4:04 ` [PATCH v8 2/2] IB/core: use MAP_DIRECT to fix / enable RDMA to DAX mappings Dan Williams
2017-10-08 4:04 ` Dan Williams
2017-10-08 4:04 ` Dan Williams
2017-10-08 6:45 ` kbuild test robot
2017-10-08 6:45 ` kbuild test robot
2017-10-08 6:45 ` kbuild test robot
2017-10-08 15:49 ` Dan Williams
2017-10-08 15:49 ` Dan Williams
2017-10-08 15:49 ` Dan Williams
2017-10-06 22:36 ` [PATCH v7 12/12] tools/testing/nvdimm: enable rdma unit tests Dan Williams
2017-10-06 22:36 ` Dan Williams
2017-10-06 22:36 ` Dan Williams
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