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In order to prevent the device from throwing spurious writes and/or reads at us we need to gate the AXI fabric interface to the PCIe until such time as we know the FW is in a known good state. To accomplish this we use the mailbox as a mechanism for us to recognize that the FW has acknowledged our presence and is no longer sending any stale message data to us. We start in fbnic_mbx_init by calling fbnic_mbx_reset_desc_ring function, disabling the DMA in both directions, and then invalidating all the descriptors in each ring. We then poll the mailbox in fbnic_mbx_poll_tx_ready and when the interrupt is set by the FW we pick it up and mark the mailboxes as ready, while also enabling the DMA. Once we have completed all the transactions and need to shut down we call into fbnic_mbx_clean which will in turn call fbnic_mbx_reset_desc_ring for each ring and shut down the DMA and once again invalidate the descriptors. Fixes: |
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| arch | ||
| block | ||
| certs | ||
| crypto | ||
| Documentation | ||
| drivers | ||
| fs | ||
| include | ||
| init | ||
| io_uring | ||
| ipc | ||
| kernel | ||
| lib | ||
| LICENSES | ||
| mm | ||
| net | ||
| rust | ||
| samples | ||
| scripts | ||
| security | ||
| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .clang-format | ||
| .clippy.toml | ||
| .cocciconfig | ||
| .editorconfig | ||
| .get_maintainer.ignore | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| .rustfmt.toml | ||
| COPYING | ||
| CREDITS | ||
| Kbuild | ||
| Kconfig | ||
| MAINTAINERS | ||
| Makefile | ||
| 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.