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dcde1c4aa7
The global dma_dev trick was mostly because the old domain_alloc op provided no context, so no way to know which IOMMU was to own the pagetable, or if a suitable one even existed at all. In the new multi-instance world with domain_alloc_paging this is no longer a concern - now we know that the given device must be associated with a valid IOMMU instance which provided the op to call in the first place, and therefore that instance can and should be the pagetable owner. To avoid worrying about the lifetime and stability of the rk_domain->iommus list, and keep the lookups simple and efficient, we'll still stash a dma_dev pointer, but now it's accurately per-domain. Signed-off-by: Robin Murphy <robin.murphy@arm.com> Tested-by: Quentin Schulz <quentin.schulz@cherry.de> Tested-by: Dang Huynh <danct12@riseup.net> Reviewed-by: Nicolas Frattaroli <nicolas.frattaroli@collabora.com> Tested-by: Nicolas Frattaroli <nicolas.frattaroli@collabora.com> Link: https://lore.kernel.org/r/25dc948a7d35c8142c5719ac22bc523f8524d006.1741886382.git.robin.murphy@arm.com 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 reStructuredText 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.