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[ Upstream commit 56b4cd4b7da9ee95778eb5c8abea49f641ebfd91 ] Intel Visual Compute Accelerator (VCA) is a family of PCIe add-in devices exposing computational units via Non Transparent Bridges (NTB, PEX 87xx). Similarly to MIC x200, we need to add DMA aliases to allow buffer access when IOMMU is enabled. Add aliases to allow computational unit access to host memory. These aliases mark the whole VCA device as one IOMMU group. All possible slot numbers (0x20) are used, since we are unable to tell what slot is used on other side. This quirk is intended for both host and computational unit sides. The VCA devices have up to five functions: four for DMA channels and one additional. Link: https://lore.kernel.org/r/5683A335CC8BE1438C3C30C49DCC38DF637CED8E@IRSMSX102.ger.corp.intel.com Signed-off-by: Slawomir Pawlowski <slawomir.pawlowski@intel.com> Signed-off-by: Przemek Kitszel <przemyslawx.kitszel@intel.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Signed-off-by: Sasha Levin <sashal@kernel.org> |
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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.