On 27/04/2017 19:14, Michel Thierry wrote:
On 12/04/17 09:22, Michel Thierry wrote:
On 12/04/17 08:58, Chris Wilson wrote:
On Wed, Apr 12, 2017 at 04:48:42PM +0100, Tvrtko Ursulin wrote:
From: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>
Looks like intel_guc_reset had the ability to sleep under the
uncore spinlock since forever but it wasn't detected until the
recent changes annotated the wait for register with might_sleep.
I have fixed it by removing holding of the uncore spinlock over
the call to gen6_hw_domain_reset, since I do not see that is
really needed. But there is always a possibility I am missing
some nasty detail so please double check.
Afaik, no we are not using the uncore.lock here to serialise resets so
yes we should be safe in dropping it.
Will the guc be coming under the same hw semaphore as gen8 per-engine
resets?
A bit unrelated, but should intel_guc_reset be intel_reset_guc instead?
Here we're trying to reset the microcontroller, not asking guc to do a
reset.
Ping?
Anyone unlucky enough to be using GuC submission should be seeing this
warning when the firmware has to be reloaded (for example after any
i-g-t hang test).
I still think the function should be renamed to _reset_guc though, since
it's the hw reseting the guc, not the other way around.
Acked-by: Michel Thierry <michel.thierry@xxxxxxxxx>
Thanks! Now just exercise restrain in suggesting bikesheds and if
someone can provide an r-b we could merge this. ;) (To be read as - lets
leave the renaming for a follow up work since this fix is not to blame
for the objectionable name.)
Regards,
Tvrtko
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