On Thu, Jan 20, 2022 at 05:36:22PM -0800, John Harrison wrote:
> On 1/19/2022 13:24, Matthew Brost wrote:
> > Now that the error capture is fully decoupled from fence signalling
> > (request retirement to free memory, which in turn depends on resets) we
> > can safely flush the G2H handler during a GT reset. This is eliminates
> This eliminates
>
> John.
>
Yep, will fixup in the next rev.
Matt
> > corner cases where GuC generated G2H (e.g. engine resets) race with a GT
> > reset.
> >
> > v2:
> > (John Harrison)
> > - Fix typo in commit message (s/is/in)
> >
> > Signed-off-by: Matthew Brost <matthew.br...@intel.com>
> > Reviewed-by: John Harrison <john.c.harri...@intel.com>
> > ---
> > .../gpu/drm/i915/gt/uc/intel_guc_submission.c | 18 +-----------------
> > 1 file changed, 1 insertion(+), 17 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
> > b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
> > index 514b3060b141..406dd2e3f5a9 100644
> > --- a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
> > +++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
> > @@ -1396,8 +1396,6 @@ static void guc_flush_destroyed_contexts(struct
> > intel_guc *guc);
> > void intel_guc_submission_reset_prepare(struct intel_guc *guc)
> > {
> > - int i;
> > -
> > if (unlikely(!guc_submission_initialized(guc))) {
> > /* Reset called during driver load? GuC not yet initialised! */
> > return;
> > @@ -1414,21 +1412,7 @@ void intel_guc_submission_reset_prepare(struct
> > intel_guc *guc)
> > guc_flush_submissions(guc);
> > guc_flush_destroyed_contexts(guc);
> > -
> > - /*
> > - * Handle any outstanding G2Hs before reset. Call IRQ handler directly
> > - * each pass as interrupt have been disabled. We always scrub for
> > - * outstanding G2H as it is possible for outstanding_submission_g2h to
> > - * be incremented after the context state update.
> > - */
> > - for (i = 0; i < 4 && atomic_read(&guc->outstanding_submission_g2h);
> > ++i) {
> > - intel_guc_to_host_event_handler(guc);
> > -#define wait_for_reset(guc, wait_var) \
> > - intel_guc_wait_for_pending_msg(guc, wait_var, false, (HZ / 20))
> > - do {
> > - wait_for_reset(guc, &guc->outstanding_submission_g2h);
> > - } while (!list_empty(&guc->ct.requests.incoming));
> > - }
> > + flush_work(&guc->ct.requests.worker);
> > scrub_guc_desc_for_outstanding_g2h(guc);
> > }
>
