Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> writes: > An oddity occurs on Sandybridge, Ivybridge and Haswell (and presumably > Valleyview) in that for the period following the GPU restart after a > reset, there are no GT interrupts received. From Ville's notes, bit 0 in > the HWSTAM corresponds to the render interrupt, and if we unmask it we > do see immediate resumption of GT interrupt delivery (via the master irq > handler) after the reset. > > v2: Limit the w/a to the render interrupt from rcs > > Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=107500 > Fixes: c5498089463b ("drm/i915: Mask everything in ring HWSTAM on gen6+ in ringbuffer mode") > References: d420a50c21ef ("drm/i915: Clean up the HWSTAM mess") > Testcase: igt/gem_eio/reset-stress > Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> > Cc: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx> > --- > drivers/gpu/drm/i915/intel_ringbuffer.c | 14 ++++++++++++-- > 1 file changed, 12 insertions(+), 2 deletions(-) > > diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c > index 8003cef767ba..5a2601a4d1aa 100644 > --- a/drivers/gpu/drm/i915/intel_ringbuffer.c > +++ b/drivers/gpu/drm/i915/intel_ringbuffer.c > @@ -387,8 +387,18 @@ static void intel_ring_setup_status_page(struct intel_engine_cs *engine) > mmio = RING_HWS_PGA(engine->mmio_base); > } > > - if (INTEL_GEN(dev_priv) >= 6) > - I915_WRITE(RING_HWSTAM(engine->mmio_base), 0xffffffff); > + if (INTEL_GEN(dev_priv) >= 6) { > + u32 mask = ~0u; > + > + /* > + * Keep the render interrupt unmasked as this papaers over papers, tho papaers sounds like it needs grown up to walk it across the reset. > + * lost interrupts following a reset. > + */ > + if (engine->id == RCS) > + mask &= ~BIT(0); > + > + I915_WRITE(RING_HWSTAM(engine->mmio_base), mask); This is fine too as the improved test pushes it with all engines. Acked-by: Mika Kuoppala <mika.kuoppala@xxxxxxxxxxxxxxx> > + } > > I915_WRITE(mmio, engine->status_page.ggtt_offset); > POSTING_READ(mmio); > -- > 2.18.0 > > _______________________________________________ > Intel-gfx mailing list > Intel-gfx@xxxxxxxxxxxxxxxxxxxxx > https://lists.freedesktop.org/mailman/listinfo/intel-gfx _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/intel-gfx
