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drm/i915: Fix semaphore emission for BDW+ RCS ringbuffer emission 

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 <chris@chris-wilson.co.uk>
Link: http://patchwork.freedesktop.org/patch/msgid/20170324151724.32640-2-chris@chris-wilson.co.uk
Reviewed-by: Michał Winiarski <michal.winiarski@intel.com>
This commit is contained in:
Chris Wilson 2017-03-24 15:17:24 +00:00
parent e02d9d76bf
commit 6f9b850bec
1 changed files with 1 additions and 1 deletions
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2
drivers/gpu/drm/i915/intel_ringbuffer.c
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@ -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;