After a GPU reset, we need to drain all the CS events so that we have an accurate picture of the execlists state at the time of the reset. Be paranoid and force a read of the CSB write pointer from memory. Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> Cc: Mika Kuoppala <mika.kuoppala@xxxxxxxxxxxxxxx> --- drivers/gpu/drm/i915/gt/intel_lrc.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/gpu/drm/i915/gt/intel_lrc.c b/drivers/gpu/drm/i915/gt/intel_lrc.c index 3d83c7e0d9de..61a38a4ccbca 100644 --- a/drivers/gpu/drm/i915/gt/intel_lrc.c +++ b/drivers/gpu/drm/i915/gt/intel_lrc.c @@ -2836,6 +2836,10 @@ static void __execlists_reset(struct intel_engine_cs *engine, bool stalled) struct i915_request *rq; u32 *regs; + mb(); /* paranoia: read the CSB pointers from after the reset */ + clflush(execlists->csb_write); + mb(); + process_csb(engine); /* drain preemption events */ /* Following the reset, we need to reload the CSB read/write pointers */ -- 2.23.0 _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/intel-gfx
