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When we're initially enabling driver support for a new platform/IP, we usually implement all workarounds documented in the WA database in the driver. Many of those workarounds are restricted to early steppings that only showed up in pre-production hardware (i.e., internal test chips that are not available to the general public). Since the workarounds for early, pre-production steppings tend to be some of the ugliest and most complicated workarounds, we generally want to eliminate them and simplify the code once the platform has launched and our internal usage of those pre-production parts have been phased out. Let's add a flag to the device info that tracks which platforms still have support for pre-production workarounds for so that we can print a warning and taint if someone tries to load the driver on a pre-production part for a platform without pre-production workarounds. This will help our internal users understand the likely problems they'll encounter if they try to load the driver on an old pre-production device. The Xe behavior here is similar to what we've done for many years on i915 (see intel_detect_preproduction_hw()), except that instead of manually coding up ranges of device steppings that we believe to be pre-production hardware, Xe will use the hardware's own production vs pre-production fusing status, which we can read from the FUSE2 register. This fuse didn't exist on older Intel hardware, but should be present on all platforms supported by the Xe driver. Going forward, let's set the expectation that we'll start looking into removing pre-production workarounds for a platform around the time that platforms of the next major IP stepping are having their force_probe requirement lifted. This timing is just a rough guideline; there may be cases where some instances of pre-production parts are still being actively used in CI farms, internal device pools, etc. and we'll need to wait a bit longer for those to be swapped out. v2: - Fix inverted forcewake check v3: - Invert flag and add it to the platforms on which we still have pre-prod workarounds. (Jani, Lucas) v4: - Avoid checking pre-production on VF since they don't have access to the FUSE2 register. Bspec: 78271, 52544 Reviewed-by: Lucas De Marchi <lucas.demarchi@intel.com> Link: https://patch.msgid.link/20251212181411.294854-3-matthew.d.roper@intel.com Signed-off-by: Matt Roper <matthew.d.roper@intel.com> |
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| 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 | ||
| .pylintrc | ||
| .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.