f6b8ab32e3
In support of the Linux CXL core scaling for a wider set of CXL devices, allow for the creation of memdevs with some memory device capabilities disabled. Specifically, allow for CXL devices outside of those claiming to be compliant with the generic CXL memory device class code, like vendor specific Type-2/3 devices that host CXL.mem. This implies, allow for the creation of memdevs that only support component-registers, not necessarily memory-device-registers (like mailbox registers). A memdev derived from a CXL endpoint that does not support generic class code expectations is tagged "CXL_DEVTYPE_DEVMEM", while a memdev derived from a class-code compliant endpoint is tagged "CXL_DEVTYPE_CLASSMEM". The primary assumption of a CXL_DEVTYPE_DEVMEM memdev is that it optionally may not host a mailbox. Disable the command passthrough ioctl for memdevs that are not CXL_DEVTYPE_CLASSMEM, and return empty strings from memdev attributes associated with data retrieved via the class-device-standard IDENTIFY command. Note that empty strings were chosen over attribute visibility to maintain compatibility with shipping versions of cxl-cli that expect those attributes to always be present. Once cxl-cli has dropped that requirement this workaround can be deprecated. Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> Reviewed-by: Dave Jiang <dave.jiang@intel.com> Link: https://lore.kernel.org/r/168679260782.3436160.7587293613945445365.stgit@dwillia2-xfh.jf.intel.com Signed-off-by: Dan Williams <dan.j.williams@intel.com> |
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| Documentation | ||
| LICENSES | ||
| arch | ||
| block | ||
| certs | ||
| crypto | ||
| drivers | ||
| fs | ||
| include | ||
| init | ||
| io_uring | ||
| ipc | ||
| kernel | ||
| lib | ||
| mm | ||
| net | ||
| rust | ||
| samples | ||
| scripts | ||
| security | ||
| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .clang-format | ||
| .cocciconfig | ||
| .get_maintainer.ignore | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| .rustfmt.toml | ||
| COPYING | ||
| CREDITS | ||
| Kbuild | ||
| Kconfig | ||
| MAINTAINERS | ||
| Makefile | ||
| README | ||
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 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.