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Instead of relying on the vendor specific implementations to send the PME_Turn_Off message, introduce a generic way of sending the message using the MSG TLP. This is achieved by reserving a region for MSG TLP of size 'pci->region_align', at the end of the first IORESOURCE_MEM window of the host bridge. And then sending the PME_Turn_Off message during system suspend with the help of iATU. The reason for reserving the MSG TLP region at the end of the IORESOURCE_MEM is to avoid generating holes in between, because when the region is allocated using allocate_resource(), memory will be allocated from the start of the window. Later, if memory gets allocated for an endpoint of size bigger than 'region_align', there will be a hole between MSG TLP region and endpoint memory. This generic implementation is optional for the glue drivers and can be overridden by a custom 'pme_turn_off' callback. Link: https://lore.kernel.org/linux-pci/20240418-pme_msg-v8-5-a54265c39742@nxp.com Signed-off-by: Frank Li <Frank.Li@nxp.com> Signed-off-by: Krzysztof Wilczyński <kwilczynski@kernel.org> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.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 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.