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Starting on Xe2, the GSCCS engine reset is a 2-step process. When the driver or the GuC hits the GDRST register, the CS is immediately reset and a success is reported, but the GSC shim continues its reset in the background. While the shim reset is ongoing, the CS is able to accept new context submission, but any commands that require the shim will be stalled until the reset is completed. This means that we can keep submitting to the GSCCS as long as we make sure that the preemption timeout is big enough to cover any delay introduced by the reset; since the GSC preempt timeout is not tunable at runtime, we only need to check that the value set in kconfig is big enough (and increase it if it isn't). When the shim reset completes, a specific CS interrupt is triggered, in response to which we need to check the GSCI_TIMER_STATUS register to see if the reset was successful or not. Note that the GSCI_TIMER_STATUS register is not power save/restored, so it gets reset on MC6 entry. However, a reset failure stops MC6, so in that scenario we're always guaranteed to find the correct value. Since we can't check the register within interrupt context, the existing GSC worker has been updated to handle it. The expected action to take on ER failure is to trigger a driver FLR, but we still don't support that, so for now we just print an error. A comment has been added to the code to keep track of the FLR requirement. v2: Add a check for the initial timeout value (Alan) Signed-off-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com> Cc: Alan Previn <alan.previn.teres.alexis@intel.com> Reviewed-by: Alan Previn <alan.previn.teres.alexis@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20240304145634.820684-1-daniele.ceraolospurio@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 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.