[Bug 104262] [CI] igt at drv_selftest@live_hangcheck - incomplete - Softdog

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=104262

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

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

--- Comment #3 from Chris Wilson <chris at chris-wilson.co.uk> ---
Optimistically:

commit fcb1de54e2d9c84a2d3275d1febde00e92d45aa0
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Tue Dec 19 09:01:10 2017 +0000

    drm/i915: Add a strong mb to resetting the has-CS-interrupt bit

    After a reset, the state of the CSB registers are scrubbed and not valid
    until a powercontext is reloaded. We only know when a powercontext has
    been reloaded once we see a CS-interrupt, before then we must ignore the
    CSB registers within the execlists_submission_tasklet. However, glk is
    sporadically dying with an illegal CSB pointer value (both in the HSWP
    and mmio) suggesting that it is running with the CS-interrupt bit set
    before the powercontext has been reloaded. Make sure the clearing of
    that bit is serialised on reset with the re-enabling of the tasklet.

    References: https://bugs.freedesktop.org/show_bug.cgi?id=104262
    Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
    Cc: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
    Cc: Michał Winiarski <michal.winiarski at intel.com>
    Cc: Mika Kuoppala <mika.kuoppala at linux.intel.com>
    Link:
https://patchwork.freedesktop.org/patch/msgid/20171219090110.11153-1-chris@chris-wilson.co.uk
    Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin at intel.com>

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