[Intel-gfx] [PATCH] Revert "drm/i915/guc: Add delay to disable scheduling after pin count goes to zero"

[Teres Alexis, Alan Previn]

I think i found the problem - will trybot next before reposting a new rev.

was a terribly careless typo when rebasing from internal for drmtip:
guc_context_sched_disable called do_sched_disable which was supposed to call __guc_context_sched_disable (if the context
was really meant to be finally disabled) but instead called guc_context_sched_disable (no underscore) causing an
infinite loop for mid-disabling.

...alan

On Fri, 2022-08-19 at 16:47 +0000, Teres Alexis, Alan Previn wrote:
> Will look into this - apologies for the trouble Matt. 
> ...alan
> 
> -----Original Message-----
> From: Harrison, John C <john.c.harrison at intel.com> 
> Sent: Friday, August 19, 2022 8:46 AM
> To: Auld, Matthew <matthew.auld at intel.com>; intel-gfx at lists.freedesktop.org
> Cc: Brost, Matthew <matthew.brost at intel.com>; Teres Alexis, Alan Previn <alan.previn.teres.alexis at intel.com>
> Subject: Re: [PATCH] Revert "drm/i915/guc: Add delay to disable scheduling after pin count goes to zero"
> 
> On 8/19/2022 05:39, Matthew Auld wrote:
> > This reverts commit 6a079903847cce1dd06345127d2a32f26d2cd9c6.
> > 
> > Everything in CI using GuC is now timing out[1], and killing the 
> > machine with this change (perhaps a deadlock?). CI was recently on 
> > fire due to some changes coming in from -rc1, so likely the pre-merge 
> > CI results for this series were invalid? For now just revert, unless 
> > GuC experts already have a fix in mind.
> > 
> > [1] https://intel-gfx-ci.01.org/tree/drm-tip/index.html?
> > 
> > Signed-off-by: Matthew Auld <matthew.auld at intel.com>
> > Cc: Matthew Brost <matthew.brost at intel.com>
> > Cc: Alan Previn <alan.previn.teres.alexis at intel.com>
> > Cc: John Harrison <John.C.Harrison at Intel.com>
> Reviewed-by: John Harrison <John.C.Harrison at Intel.com>
> 
> Given that CI was claiming a pass for the original patch set, no we don't have a fix in mind. It is most frustrating when CI says all green if the entire universe is so broken that no tests were even running :(.
> 
> John.
> 
> 
> > ---
> >   drivers/gpu/drm/i915/gem/i915_gem_context.c   |   2 +-
> >   drivers/gpu/drm/i915/gt/intel_context.h       |   8 -
> >   drivers/gpu/drm/i915/gt/intel_context_types.h |   7 -
> >   drivers/gpu/drm/i915/gt/uc/intel_guc.h        |  17 +-
> >   .../gpu/drm/i915/gt/uc/intel_guc_debugfs.c    |  60 -------
> >   .../gpu/drm/i915/gt/uc/intel_guc_submission.c | 154 +++---------------
> >   drivers/gpu/drm/i915/i915_selftest.h          |   2 -
> >   7 files changed, 27 insertions(+), 223 deletions(-)
> >