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Having completed a test run of gem_eio across all machines in CI we also observe the phenomenon (of lost interrupts after resetting the GPU) on gen3 machines as well as the previously sighted gen6/gen7. Let's apply the same HWSTAM workaround that was effective for gen6+ for all, as although we haven't seen the same failure on gen4/5 it seems prudent to keep the code the same. As a consequence we can remove the extra setting of HWSTAM and apply the register from a single site. v2: Delazy and move the HWSTAM into its own function v3: Mask off all HWSP writes on driver unload and engine cleanup. v4: And what about the physical hwsp? v5: No, engine->init_hw() is not called from driver_init_hw(), don't be daft. Really scrub HWSTAM as early as we can in driver_init_mmio() v6: Rename set_hwsp as it was setting the mask not the hwsp register. v7: Ville pointed out that although vcs(bsd) was introduced for g4x/ilk, per-engine HWSTAM was not introduced until gen6! References: https://bugs.freedesktop.org/show_bug.cgi?id=108735 Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Cc: Ville Syrjälä <ville.syrjala@linux.intel.com> Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20181218102712.11058-1-chris@chris-wilson.co.uk
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.