[PATCH 22/43] drm/i915/bdw: Ring idle and stop with logical rings

Thomas Daniel
2014-07-24T16:05:15Z

From: Oscar Mateo <oscar.mateo@intel.com>

This is a hard one, since there is no direct hardware ring to
control when in Execlists.

We reuse intel_ring_idle here, but it should be fine as long
as i915_add_request does the ring thing.

Signed-off-by: Oscar Mateo <oscar.mateo@intel.com>
---
drivers/gpu/drm/i915/intel_lrc.c | 24 ++++++++++++++++++++++--
1 file changed, 22 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c
index dcf59c6..c30518c 100644
--- a/drivers/gpu/drm/i915/intel_lrc.c
+++ b/drivers/gpu/drm/i915/intel_lrc.c
@@ -103,7 +103,24 @@ int intel_execlists_submission(struct drm_device *dev, struct drm_file *file,

void intel_logical_ring_stop(struct intel_engine_cs *ring)
{
- /* TODO */
+ struct drm_i915_private *dev_priv = ring->dev->dev_private;
+ int ret;
+
+ if (!intel_ring_initialized(ring))
+ return;
+
+ ret = intel_ring_idle(ring);
+ if (ret && !i915_reset_in_progress(&to_i915(ring->dev)->gpu_error))
+ DRM_ERROR("failed to quiesce %s whilst cleaning up: %d\n",
+ ring->name, ret);
+
+ /* TODO: Is this correct with Execlists enabled? */
+ I915_WRITE_MODE(ring, _MASKED_BIT_ENABLE(STOP_RING));
+ if (wait_for_atomic((I915_READ_MODE(ring) & MODE_IDLE) != 0, 1000)) {
+ DRM_ERROR("%s :timed out trying to stop ring\n", ring->name);
+ return;
+ }
+ I915_WRITE_MODE(ring, _MASKED_BIT_DISABLE(STOP_RING));
}

int logical_ring_flush_all_caches(struct intel_ringbuffer *ringbuf)
@@ -479,10 +496,13 @@ static int gen8_emit_request(struct intel_ringbuffer *ringbuf)

void intel_logical_ring_cleanup(struct intel_engine_cs *ring)
{
+ struct drm_i915_private *dev_priv = ring->dev->dev_private;
+
if (!intel_ring_initialized(ring))
return;

- /* TODO: make sure the ring is stopped */
+ intel_logical_ring_stop(ring);
+ WARN_ON((I915_READ_MODE(ring) & MODE_IDLE) == 0);
ring->preallocated_lazy_request = NULL;
ring->outstanding_lazy_seqno = 0;

--
1.7.9.5