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The SMMU provides a Stall model for handling page faults in platform devices. It is similar to PCIe PRI, but doesn't require devices to have their own translation cache. Instead, faulting transactions are parked and the OS is given a chance to fix the page tables and retry the transaction. Enable stall for devices that support it (opt-in by firmware). When an event corresponds to a translation error, call the IOMMU fault handler. If the fault is recoverable, it will call us back to terminate or continue the stall. To use stall device drivers need to enable IOMMU_DEV_FEAT_IOPF, which initializes the fault queue for the device. Tested-by: Zhangfei Gao <zhangfei.gao@linaro.org> Reviewed-by: Eric Auger <eric.auger@redhat.com> Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> Signed-off-by: Jean-Philippe Brucker <jean-philippe@linaro.org> Link: https://lore.kernel.org/r/20210526161927.24268-4-jean-philippe@linaro.org Signed-off-by: Will Deacon <will@kernel.org>
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.