[Bug 108735] [CI][BAT] igt at drv_selftest@live_hangcheck - _igt_reset_evict_vma timed out

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=108735

Chris Wilson <chris at chris-wilson.co.uk> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|REOPENED                    |RESOLVED
         Resolution|---                         |FIXED

--- Comment #7 from Chris Wilson <chris at chris-wilson.co.uk> ---
commit 060f23225d8203b8cd9e412d984e5237e63c83dc (HEAD -> drm-intel-next-queued,
drm-intel/drm-intel-next-queued)
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Tue Dec 18 10:27:12 2018 +0000

    drm/i915: Apply missed interrupt after reset w/a to all ringbuffer gen

    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 at chris-wilson.co.uk>
    Cc: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
    Cc: Ville Syrjälä <ville.syrjala at linux.intel.com>
    Reviewed-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
    Link:
https://patchwork.freedesktop.org/patch/msgid/20181218102712.11058-1-chris@chris-wilson.co.uk

and hope again.

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