From: Jason Gunthorpe <jgg@nvidia.com>
To: Christoph Hellwig <hch@lst.de>
Cc: Robin Murphy <robin.murphy@arm.com>,
Alex Williamson <alex.williamson@redhat.com>,
Lu Baolu <baolu.lu@linux.intel.com>,
Christian Benvenuti <benve@cisco.com>,
Cornelia Huck <cohuck@redhat.com>,
David Woodhouse <dwmw2@infradead.org>,
Gerald Schaefer <gerald.schaefer@linux.ibm.com>,
iommu@lists.linux-foundation.org,
Jason Wang <jasowang@redhat.com>, Joerg Roedel <joro@8bytes.org>,
kvm@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
linux-arm-msm@vger.kernel.org, linux-rdma@vger.kernel.org,
linux-s390@vger.kernel.org,
Matthew Rosato <mjrosato@linux.ibm.com>,
"Michael S. Tsirkin" <mst@redhat.com>,
Nelson Escobar <neescoba@cisco.com>,
netdev@vger.kernel.org, Rob Clark <robdclark@gmail.com>,
Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>,
virtualization@lists.linux-foundation.org,
Will Deacon <will@kernel.org>,
"Tian, Kevin" <kevin.tian@intel.com>
Subject: Re: [PATCH 1/5] iommu: Replace uses of IOMMU_CAP_CACHE_COHERENCY with dev_is_dma_coherent()
Date: Wed, 6 Apr 2022 13:06:23 -0300 [thread overview]
Message-ID: <20220406160623.GI2120790@nvidia.com> (raw)
In-Reply-To: <20220406155056.GA30433@lst.de>
On Wed, Apr 06, 2022 at 05:50:56PM +0200, Christoph Hellwig wrote:
> On Wed, Apr 06, 2022 at 12:18:23PM -0300, Jason Gunthorpe wrote:
> > > Oh, I didn't know about device_get_dma_attr()..
>
> Which is completely broken for any non-OF, non-ACPI plaform.
I saw that, but I spent some time searching and could not find an
iommu driver that would load independently of OF or ACPI. ie no IOMMU
platform drivers are created by board files. Things like Intel/AMD
discover only from ACPI, etc.
So it might be OK in the constrained case of having an iommu_domain
attached to the device being queried?
Jason
next prev parent reply other threads:[~2022-04-06 17:54 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-04-05 16:15 [PATCH 0/5] Make the iommu driver no-snoop block feature consistent Jason Gunthorpe
2022-04-05 16:16 ` [PATCH 1/5] iommu: Replace uses of IOMMU_CAP_CACHE_COHERENCY with dev_is_dma_coherent() Jason Gunthorpe
2022-04-06 5:30 ` Christoph Hellwig
2022-04-06 12:07 ` Jason Gunthorpe
2022-04-06 13:51 ` Christoph Hellwig
2022-04-06 14:14 ` Jason Gunthorpe
2022-04-06 15:47 ` Christoph Hellwig
2022-04-06 15:48 ` Jason Gunthorpe
2022-04-06 15:48 ` Robin Murphy
2022-04-06 13:56 ` Robin Murphy
2022-04-06 14:24 ` Jason Gunthorpe
2022-04-06 15:18 ` Jason Gunthorpe
2022-04-06 15:50 ` Christoph Hellwig
2022-04-06 16:06 ` Jason Gunthorpe [this message]
2022-04-06 16:10 ` Christoph Hellwig
2022-04-06 17:17 ` Jason Gunthorpe
2022-04-07 7:18 ` Tian, Kevin
2022-04-07 13:59 ` Jason Gunthorpe
2022-04-07 15:17 ` Robin Murphy
2022-04-07 15:23 ` Jason Gunthorpe
2022-04-07 22:37 ` Alex Williamson
2022-04-07 15:31 ` Christoph Hellwig
2022-04-07 8:53 ` Niklas Schnelle
2022-04-05 16:16 ` [PATCH 2/5] vfio: Require that devices support DMA cache coherence Jason Gunthorpe
2022-04-05 19:10 ` Alex Williamson
2022-04-05 19:29 ` Jason Gunthorpe
2022-04-06 7:02 ` Tian, Kevin
2022-04-07 14:53 ` Jason Gunthorpe
2022-04-05 16:16 ` [PATCH 3/5] iommu: Introduce the domain op enforce_cache_coherency() Jason Gunthorpe
2022-04-05 19:50 ` Alex Williamson
2022-04-05 22:57 ` Jason Gunthorpe
2022-04-05 23:31 ` Tian, Kevin
2022-04-06 0:08 ` Tian, Kevin
2022-04-06 7:09 ` Tian, Kevin
2022-04-06 12:27 ` Jason Gunthorpe
2022-04-05 16:16 ` [PATCH 4/5] vfio: Move the Intel no-snoop control off of IOMMU_CACHE Jason Gunthorpe
2022-04-05 16:16 ` [PATCH 5/5] iommu: Delete IOMMU_CAP_CACHE_COHERENCY Jason Gunthorpe
2022-04-06 6:52 ` [PATCH 0/5] Make the iommu driver no-snoop block feature consistent Tian, Kevin
2022-04-07 14:56 ` Jason Gunthorpe
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