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Use it to store all vSMMU-related data. The vsid (Virtual Stream ID) will be the first use case. Since the vsid reader will be the eventq handler that already holds a streams_mutex, reuse that to fence the vmaster too. Also add a pair of arm_smmu_attach_prepare/commit_vmaster helpers to set or unset the master->vmaster pointer. Put the helpers inside the existing arm_smmu_attach_prepare/commit(). For identity/blocked ops that don't call arm_smmu_attach_prepare/commit(), add a simpler arm_smmu_master_clear_vmaster helper to unset the vmaster. Link: https://patch.msgid.link/r/a7f282e1a531279e25f06c651e95d56f6b120886.1741719725.git.nicolinc@nvidia.com Reviewed-by: Jason Gunthorpe <jgg@nvidia.com> Reviewed-by: Pranjal Shrivastava <praan@google.com> Acked-by: Will Deacon <will@kernel.org> Signed-off-by: Nicolin Chen <nicolinc@nvidia.com> Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
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.