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PTM requires an unbroken path of PTM-supporting devices between the PTM Root and the ultimate PTM Requester, but if a Switch supports PTM, only the Upstream Port can have a PTM Capability; the Downstream Ports do not. Previously we copied the PTM configuration from the Switch Upstream Port to the Downstream Ports so dev->ptm_enabled for any device implied that all the upstream devices support PTM. Instead of making it look like Downstream Ports have their own PTM config, add pci_upstream_ptm(), which returns the upstream device that has a PTM Capability (either a Root Port or a Switch Upstream Port). Link: https://lore.kernel.org/r/20220909202505.314195-3-helgaas@kernel.org Tested-by: Rajvi Jingar <rajvi.jingar@linux.intel.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Reviewed-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com> Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.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 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.