Comment # 5 on bug 103199 from Chris Wilson

(In reply to Chris Wilson from comment #4)
> (In reply to Martin Peres from comment #3)
> > https://intel-gfx-ci.01.org/tree/drm-tip/drmtip_93/fi-icl-u/
> > igt@drv_missed_irq.html
> > 
> > (drv_missed_irq:1510) CRITICAL: Test assertion failure function
> > __real_main96, file ../tests/drv_missed_irq.c:159:
> > (drv_missed_irq:1510) CRITICAL: Failed assertion: missed_rings ==
> > expect_rings
> > (drv_missed_irq:1510) CRITICAL: Last errno: 9, Bad file descriptor
> > (drv_missed_irq:1510) CRITICAL: error: 0 != 0x57
> > Test drv_missed_irq failed.
> 
> icl is a different class of bug -- icl can't fake missed interrupts at all.

commit 5f521722a2a2391d693afccdf6e12be2754382d8 (HEAD -> drm-intel-next-queued,
drm-intel/drm-intel-next-queued)
Author: Chris Wilson <chris@chris-wilson.co.uk>
Date:   Fri Sep 7 12:28:51 2018 +0100

    drm/i915: Missed interrupt simulation is no more, tell the world

    Using the guc, we cannot disable the user interrupt generation as we use
    it for driving submission. And from Icelake, we no longer have the
    ability to individually mask interrupt generation from each engine,
    disabling our ability to fake missed interrupts.

    In both cases, report back to userspace that the missed interrupt
    generator is no longer available.

    Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
    Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com>
    Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
    Link:
https://patchwork.freedesktop.org/patch/msgid/20180907112856.28242-1-chris@chris-wilson.co.uk