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| author | Chris Wilson <chris@chris-wilson.co.uk> | 2018-08-08 13:51:00 +0300 |
|---|---|---|
| committer | Rodrigo Vivi <rodrigo.vivi@intel.com> | 2018-08-15 23:41:01 +0300 |
| commit | 341a15bb91d478c33d97b3b452a55181e5db6ea6 (patch) | |
| tree | d0670f88017b678bb779a567280a488938ff18c4 | |
| parent | 557ce95051c8eff67af48612ab350d8408aa0541 (diff) | |
| download | linux-341a15bb91d478c33d97b3b452a55181e5db6ea6.tar.xz | |
drm/i915: Unmask user interrupts writes into HWSP on snb/ivb/vlv/hsw
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@chris-wilson.co.uk>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Acked-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180808105101.913-2-chris@chris-wilson.co.uk
(cherry picked from commit a4a717010f4e8cacaa3f0cae8a22f25c39ae1d41)
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
| -rw-r--r-- | drivers/gpu/drm/i915/intel_ringbuffer.c | 14 |
1 files changed, 12 insertions, 2 deletions
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c index 33faad3197fe..6a8f27d0a742 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 papers over + * lost interrupts following a reset. + */ + if (engine->id == RCS) + mask &= ~BIT(0); + + I915_WRITE(RING_HWSTAM(engine->mmio_base), mask); + } I915_WRITE(mmio, engine->status_page.ggtt_offset); POSTING_READ(mmio); |