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This patch makes preparation for modularization of DFL sub feature drivers. DFL based FPGA devices may contain some IP blocks which are already supported by kernel, most of them are supported by platform device drivers. We could create platform devices for these IP blocks and get them supported by these drivers. An important issue is that platform device drivers usually requests mmio resources on probe. But now DFL mmio is mapped in DFL bus driver (e.g. dfl-pci) as a whole region. Then platform device drivers for sub features can't request their own mmio resources again. This is what the patch trying to resolve. This patch changes the DFL enumeration. DFL bus driver will unmap mmio resources after first step enumeration and pass enumeration info to DFL framework. Then DFL framework will map the mmio resources again, do 2nd step enumeration, and also unmap the mmio resources. In this way, sub feature drivers could then request their own mmio resources as needed. An exception is that mmio resource of FIU headers are still mapped in DFL bus driver. The FIU headers have some fundamental functions (sriov set, port enable/disable) needed for DFL bus devices and other sub features. They should not be unmapped as long as DFL bus device is alive. Signed-off-by: Xu Yilun <yilun.xu@intel.com> Signed-off-by: Wu Hao <hao.wu@intel.com> Signed-off-by: Matthew Gerlach <matthew.gerlach@linux.intel.com> Signed-off-by: Russ Weight <russell.h.weight@intel.com> Reviewed-by: Tom Rix <trix@redhat.com> Acked-by: Wu Hao <hao.wu@intel.com> Signed-off-by: Moritz Fischer <mdf@kernel.org> |
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| .cocciconfig | ||
| .get_maintainer.ignore | ||
| .gitattributes | ||
| .gitignore | ||
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| Kbuild | ||
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| README | ||
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.