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[0/8] drm/i915: PREEMPT_RT related fixups.

Message ID 20211214140301.520464-1-bigeasy@linutronix.de (mailing list archive)
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Series drm/i915: PREEMPT_RT related fixups. | expand

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Sebastian Andrzej Siewior Dec. 14, 2021, 2:02 p.m. UTC 
Hi,

The following patches are from the PREEMPT_RT queue. One patch was
applied, one added so here are eight again. I can post them in smaller
batches if that is preferred.
It is mostly about disabling interrupts/preemption which leads to
problems.  Unfortunately DRM_I915_LOW_LEVEL_TRACEPOINTS had to be
disabled because it acquires locks from within trace points. Making the
lock a raw_spinlock_t led to higher latencies during video playback
  https://lore.kernel.org/all/20211006164628.s2mtsdd2jdbfyf7g@linutronix.de/

and I'm not sure if I hit the worse case here.
I tested it on a SandyBridge with built-in i915 by using X, OpenGL and
playing videos without noticing any warnings. However, some code paths
were not entered.

Sebastian