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VF migration sends a marker to the GUC before resource fixups begin, and repeats the marker with the RESFIX_DONE notification. This prevents the GUC from submitting jobs during double migration events. To reliably test double migration, a second migration must be triggered while fixups from the first migration are still in progress. Since fixups complete quickly, reproducing this scenario is difficult. Introduce debugfs controls to add delays in the post-fixup phase, creating a deterministic window for subsequent migrations. New debugfs entries: /sys/kernel/debug/dri/BDF/ ├── tile0 │ ├─gt0 │ │ ├──vf │ │ │ ├── resfix_stoppers resfix_stoppers: Predefined checkpoints that allow the migration process to pause at specific stages. The stages are given below. VF_MIGRATION_WAIT_RESFIX_START - BIT(0) VF_MIGRATION_WAIT_FIXUPS - BIT(1) VF_MIGRATION_WAIT_RESTART_JOBS - BIT(2) VF_MIGRATION_WAIT_RESFIX_DONE - BIT(3) Each state will pause with a 1-second delay per iteration, continuing until its corresponding bit is cleared. Signed-off-by: Satyanarayana K V P <satyanarayana.k.v.p@intel.com> Cc: Michal Wajdeczko <michal.wajdeczko@intel.com> Cc: Matthew Brost <matthew.brost@intel.com> Cc: Tomasz Lis <tomasz.lis@intel.com> Acked-by: Adam Miszczak <adam.miszczak@linux.intel.com> Reviewed-by: Michal Wajdeczko <michal.wajdeczko@intel.com> Signed-off-by: Michal Wajdeczko <michal.wajdeczko@intel.com> Link: https://patch.msgid.link/20251201095011.21453-10-satyanarayana.k.v.p@intel.com |
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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.