From: Jason Gunthorpe <jgg@nvidia•com>
To: Janne Grunau <j@jannau•net>
Cc: linux-arm-kernel@lists•infradead.org,
Kevin Tian <kevin.tian@intel•com>, Will Deacon <will@kernel•org>,
Sven Peter <sven@svenpeter•dev>,
linuxppc-dev@lists•ozlabs.org, Joerg Roedel <joro@8bytes•org>,
Hector Martin <marcan@marcan•st>,
Nicholas Piggin <npiggin@gmail•com>,
Robin Murphy <robin.murphy@arm•com>,
iommu@lists•linux.dev, asahi@lists•linux.dev,
David Woodhouse <dwmw2@infradead•org>,
Alyssa Rosenzweig <alyssa@rosenzweig•io>,
Lu Baolu <baolu.lu@linux•intel.com>
Subject: Re: [PATCH 6/8] iommu/dart: Move the blocked domain support to a global static
Date: Wed, 27 Sep 2023 09:59:25 -0300 [thread overview]
Message-ID: <20230927125925.GT13733@nvidia.com> (raw)
In-Reply-To: <ZRMrZJ1HgpULWeyv@robin>
On Tue, Sep 26, 2023 at 09:05:08PM +0200, Janne Grunau wrote:
> > +static int apple_dart_attach_dev_blocked(struct iommu_domain *domain,
> > + struct device *dev)
> > +{
> > + struct apple_dart_master_cfg *cfg = dev_iommu_priv_get(dev);
> > + struct apple_dart_stream_map *stream_map;
> > + int i;
> > +
> > + if (cfg->stream_maps[0].dart->force_bypass)
> > + return -EINVAL;
>
> unrelated to this change as this keeps the current behavior but I think
> force_bypass should not override IOMMU_DOMAIN_BLOCKED.
That would be great, dart is the only driver that can fail blocked..
> It is set if the CPU page size is smaller than dart's page
> size. Obviously dart can't translate in that situation but it should
> be still possible to block it completely.
Wonderful, actually it probably shouldn't even support allocating a
paging domain if it can't support PAGE_SIZE mappings?
> How do we manage this? I can write a patch either to the current state
> or based on this series.
Let me just add a patch to this series to remove that test with your
explanation, that will avoid patch ordering troubles.
Thanks,
Jason
next prev parent reply other threads:[~2023-09-27 13:00 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-09-22 17:07 [PATCH 0/8] iommu: Convert dart & iommufd to the new domain_alloc_paging() Jason Gunthorpe
2023-09-22 17:07 ` [PATCH 1/8] iommu: Move IOMMU_DOMAIN_BLOCKED global statics to ops->blocked_domain Jason Gunthorpe
2023-09-25 2:26 ` Baolu Lu
2023-09-22 17:07 ` [PATCH 2/8] iommu/vt-d: Update the definition of the blocking domain Jason Gunthorpe
2023-09-25 2:27 ` Baolu Lu
2023-09-22 17:07 ` [PATCH 3/8] iommu/vt-d: Use ops->blocked_domain Jason Gunthorpe
2023-09-25 2:29 ` Baolu Lu
2023-09-25 11:41 ` Jason Gunthorpe
2023-09-26 3:28 ` Baolu Lu
2023-09-22 17:07 ` [PATCH 4/8] iommufd: Convert to alloc_domain_paging() Jason Gunthorpe
2023-09-22 17:07 ` [PATCH 5/8] iommu/dart: Use static global identity domains Jason Gunthorpe
2023-09-22 17:07 ` [PATCH 6/8] iommu/dart: Move the blocked domain support to a global static Jason Gunthorpe
2023-09-26 19:05 ` Janne Grunau
2023-09-26 19:34 ` Robin Murphy
2023-09-26 19:41 ` Robin Murphy
2023-09-27 12:59 ` Jason Gunthorpe [this message]
2023-09-22 17:07 ` [PATCH 7/8] iommu/dart: Convert to domain_alloc_paging() Jason Gunthorpe
2023-09-26 19:06 ` Janne Grunau
2023-09-22 17:07 ` [PATCH 8/8] iommu/dart: Call apple_dart_finalize_domain() as part of alloc_paging() Jason Gunthorpe
2023-09-26 19:07 ` Janne Grunau
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