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eff0c286aa
Add doorbell support by allocating a dedicated BAR using the pci_epf_alloc_doorbell() API and mapping the Endpoint MSI controller message data address to it. The data to be written in the message address is stored in the 'pci_epf_test_reg::doorbell_data' register. Finally, the RC can trigger doorbell in the Endpoint by writing the content of 'doorbell_data' register to the offset specified in 'doorbell_offset' of the 'doorbell_bar' BAR. Triggering of the doorbell is detected by pci_epf_test_doorbell_handler(), which is bound to the doorbell IRQ. On successful completion, STATUS_DOORBELL_SUCCESS status is set in the above mentioned handler. To avoid breaking compatibility between host and endpoint, add two new commands: COMMAND_ENABLE_DOORBELL and COMMAND_DISABLE_DOORBELL. The doorbell is allocated when COMMAND_ENABLE_DOORBELL command is called and destroyed when COMMAND_DISABLE_DOORBELL is called. This doorbell feature only works when both RC and EP drivers support it. If one of them doesn't support the feature, the testcase will fail. Signed-off-by: Frank Li <Frank.Li@nxp.com> [mani: code cleanups and reworded commit message] Signed-off-by: Manivannan Sadhasivam <mani@kernel.org> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Tested-by: Niklas Cassel <cassel@kernel.org> Link: https://patch.msgid.link/20250710-ep-msi-v21-6-57683fc7fb25@nxp.com |
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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 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.