From: Chris Wilson <chris@chris-wilson.co.uk>
To: Mika Kuoppala <mika.kuoppala@linux.intel.com>,
intel-gfx@lists.freedesktop.org
Subject: Re: [Intel-gfx] [PATCH 3/7] drm/i915/selftests: Relax timeout for error-interrupt reset processing
Date: Tue, 11 Feb 2020 15:33:00 +0000 [thread overview]
Message-ID: <158143518042.3635.5696176952305833936@skylake-alporthouse-com> (raw)
In-Reply-To: <87a75p9mhf.fsf@gaia.fi.intel.com>
Quoting Mika Kuoppala (2020-02-11 15:23:24)
> Chris Wilson <chris@chris-wilson.co.uk> writes:
> > + /* Kick the tasklet to process the error */
> > + intel_engine_flush_submission(engine);
>
> This pattern of usage in selftests makes me want to add mb(); to
> intel_engine_flush_submission(), as it does not seem to do it
> implicitly.
>
> We want to flush submission and observe the effects, thus
> it seems like a good place.
Hmm. From the cpu perspective the memory barrier would be on the other
side in clear_bit_unlock(), and flush_submission does unlock_wait.
But, then, we have to factor in that we have to communicate with an
external client the GPU, so perhaps an explicit memory barrier...
We certainly do perform the memory barrier in order to set the GPU in
motion, but have not relied on them for observing effects (aside from
the CSB ringbuf).
I don't see a strong argument that adding a 'mb/rmb' here will make any
difference, I don't see what we are pairing with from the GPU
perspective. But maybe there is?
-Chris
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next prev parent reply other threads:[~2020-02-11 15:33 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-10 20:57 [Intel-gfx] [PATCH 1/7] drm/i915/gt: Avoid resetting ring->head outside of its timeline mutex Chris Wilson
2020-02-10 20:57 ` [Intel-gfx] [PATCH 2/7] drm/i915/selftests: Exercise timeslice rewinding Chris Wilson
2020-02-11 14:50 ` Mika Kuoppala
2020-02-11 15:16 ` Chris Wilson
2020-02-10 20:57 ` [Intel-gfx] [PATCH 3/7] drm/i915/selftests: Relax timeout for error-interrupt reset processing Chris Wilson
2020-02-11 15:23 ` Mika Kuoppala
2020-02-11 15:33 ` Chris Wilson [this message]
2020-02-11 15:54 ` Mika Kuoppala
2020-02-11 16:00 ` Chris Wilson
2020-02-10 20:57 ` [Intel-gfx] [PATCH 4/7] drm/i915/gem: Don't leak non-persistent requests on changing engines Chris Wilson
2020-02-11 13:41 ` Tvrtko Ursulin
2020-02-11 14:15 ` Chris Wilson
2020-02-10 20:57 ` [Intel-gfx] [PATCH 5/7] drm/i915: Disable use of hwsp_cacheline for kernel_context Chris Wilson
2020-02-11 17:36 ` Mika Kuoppala
2020-02-10 20:57 ` [Intel-gfx] [PATCH 6/7] drm/i915/gt: Yield the timeslice if caught waiting on a user semaphore Chris Wilson
2020-02-10 20:57 ` [Intel-gfx] [PATCH 7/7] drm/i915/execlists: Remove preempt-to-busy roundtrip delay Chris Wilson
2020-02-12 1:08 ` Daniele Ceraolo Spurio
2020-02-14 10:10 ` Chris Wilson
2020-02-10 22:48 ` [Intel-gfx] ✗ Fi.CI.CHECKPATCH: warning for series starting with [1/7] drm/i915/gt: Avoid resetting ring->head outside of its timeline mutex Patchwork
2020-02-10 23:14 ` [Intel-gfx] ✗ Fi.CI.BAT: failure " Patchwork
2020-02-11 11:49 ` [Intel-gfx] [PATCH 1/7] " Andi Shyti
2020-02-11 11:58 ` Mika Kuoppala
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