diff options
Diffstat (limited to 'drivers/gpu/drm/i915/intel_lrc.c')
| -rw-r--r-- | drivers/gpu/drm/i915/intel_lrc.c | 35 |
1 files changed, 34 insertions, 1 deletions
diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c index fcb074bd55dc..09df74b8e917 100644 --- a/drivers/gpu/drm/i915/intel_lrc.c +++ b/drivers/gpu/drm/i915/intel_lrc.c @@ -393,6 +393,26 @@ static void execlists_context_unqueue(struct intel_engine_cs *ring) } } + if (IS_GEN8(ring->dev) || IS_GEN9(ring->dev)) { + /* + * WaIdleLiteRestore: make sure we never cause a lite + * restore with HEAD==TAIL + */ + if (req0 && req0->elsp_submitted) { + /* + * Apply the wa NOOPS to prevent ring:HEAD == req:TAIL + * as we resubmit the request. See gen8_emit_request() + * for where we prepare the padding after the end of the + * request. + */ + struct intel_ringbuffer *ringbuf; + + ringbuf = req0->ctx->engine[ring->id].ringbuf; + req0->tail += 8; + req0->tail &= ringbuf->size - 1; + } + } + WARN_ON(req1 && req1->elsp_submitted); execlists_submit_contexts(ring, req0->ctx, req0->tail, @@ -1315,7 +1335,12 @@ static int gen8_emit_request(struct intel_ringbuffer *ringbuf, u32 cmd; int ret; - ret = intel_logical_ring_begin(ringbuf, request->ctx, 6); + /* + * Reserve space for 2 NOOPs at the end of each request to be + * used as a workaround for not being allowed to do lite + * restore with HEAD==TAIL (WaIdleLiteRestore). + */ + ret = intel_logical_ring_begin(ringbuf, request->ctx, 8); if (ret) return ret; @@ -1333,6 +1358,14 @@ static int gen8_emit_request(struct intel_ringbuffer *ringbuf, intel_logical_ring_emit(ringbuf, MI_NOOP); intel_logical_ring_advance_and_submit(ringbuf, request->ctx, request); + /* + * Here we add two extra NOOPs as padding to avoid + * lite restore of a context with HEAD==TAIL. + */ + intel_logical_ring_emit(ringbuf, MI_NOOP); + intel_logical_ring_emit(ringbuf, MI_NOOP); + intel_logical_ring_advance(ringbuf); + return 0; } |