After reading the event status from the CSB, write back 0 (an invalid value) so we can detect if the HW should signal a new event without writing the event in the future. References: https://bugs.freedesktop.org/show_bug.cgi?id=108315 Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> Cc: Mika Kuoppala <mika.kuoppala@xxxxxxxxxxxxxxx> --- drivers/gpu/drm/i915/intel_lrc.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c index 22b57b8926fc..126efe20d2d6 100644 --- a/drivers/gpu/drm/i915/intel_lrc.c +++ b/drivers/gpu/drm/i915/intel_lrc.c @@ -910,6 +910,9 @@ static void process_csb(struct intel_engine_cs *engine) execlists->active); status = buf[2 * head]; + GEM_BUG_ON(!status); + GEM_DEBUG_EXEC(WRITE_ONCE(*(u32 *)(buf + 2 * head), 0)); + if (status & (GEN8_CTX_STATUS_IDLE_ACTIVE | GEN8_CTX_STATUS_PREEMPTED)) execlists_set_active(execlists, -- 2.19.1 _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/intel-gfx
