The required number of dwords for semaphore emission on BDW RCS is 8, not 6 - leading to ring buffer corruption and immediate GPU hangs when using ringbuffer submission.
Signed-off-by: Chris Wilson <[email protected]> --- drivers/gpu/drm/i915/intel_ringbuffer.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c index 62756eb2bd4a..4729ac7ac122 100644 --- a/drivers/gpu/drm/i915/intel_ringbuffer.c +++ b/drivers/gpu/drm/i915/intel_ringbuffer.c @@ -2117,7 +2117,7 @@ int intel_init_render_ring_buffer(struct intel_engine_cs *engine) num_rings = hweight32(INTEL_INFO(dev_priv)->ring_mask) - 1; - engine->emit_breadcrumb_sz += num_rings * 6; + engine->emit_breadcrumb_sz += num_rings * 8; } } else if (INTEL_GEN(dev_priv) >= 6) { engine->init_context = intel_rcs_ctx_init; -- 2.11.0 _______________________________________________ Intel-gfx mailing list [email protected] https://lists.freedesktop.org/mailman/listinfo/intel-gfx
