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Commita4fdd97622("iommu: Use flush queue capability") hid the IOMMU_DOMAIN_DMA_FQ domain type from domain allocation. A check was introduced in iommu_dma_init_domain() to fall back if not supported, but this check runs too late: by that point, devices have been attached to the IOMMU, and apple-dart's attach_dev() callback does not expect IOMMU_DOMAIN_DMA_FQ domains. Change the logic so the IOMMU_DOMAIN_DMA codepath is the default, instead of explicitly enumerating all types. Fixes an apple-dart regression in v6.5. Cc: regressions@lists.linux.dev Cc: stable@vger.kernel.org Suggested-by: Robin Murphy <robin.murphy@arm.com> Fixes:a4fdd97622("iommu: Use flush queue capability") Signed-off-by: Hector Martin <marcan@marcan.st> Reviewed-by: Neal Gompa <neal@gompa.dev> Reviewed-by: Jason Gunthorpe <jgg@nvidia.com> Link: https://lore.kernel.org/r/20230922-iommu-type-regression-v2-1-689b2ba9b673@marcan.st Signed-off-by: Joerg Roedel <jroedel@suse.de>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.