From: Oscar Mateo <oscar.ma...@intel.com>
Also known as __i915_add_request's evil twin.
On seqno preallocation, we set the request context information
correctly so that we can retrieve it both when we want to emit
or retire the request.
This is a candidate to be abstracted away (so that it replaces
__i915_add_request seamlessly).
Signed-off-by: Oscar Mateo <oscar.ma...@intel.com>
---
drivers/gpu/drm/i915/i915_gem.c | 18 +++++-
drivers/gpu/drm/i915/intel_lrc.c | 116 ++++++++++++++++++++++++++++++++++++++-
drivers/gpu/drm/i915/intel_lrc.h | 4 ++
3 files changed, 135 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index dcdffab..69db71a 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -2320,6 +2320,9 @@ int __i915_add_request(struct intel_engine_cs *ring,
u32 request_ring_position, request_start;
int ret;
+ if (intel_enable_execlists(ring->dev))
+ return intel_logical_ring_add_request(ring, file, obj,
out_seqno);
+
request_start = intel_ring_get_tail(ring->buffer);
/*
* Emit any outstanding flushes - execbuf can fail to emit the flush
@@ -2620,6 +2623,7 @@ i915_gem_retire_requests_ring(struct intel_engine_cs
*ring)
while (!list_empty(&ring->request_list)) {
struct drm_i915_gem_request *request;
+ struct intel_ringbuffer *ringbuf;
request = list_first_entry(&ring->request_list,
struct drm_i915_gem_request,
@@ -2629,12 +2633,24 @@ i915_gem_retire_requests_ring(struct intel_engine_cs
*ring)
break;
trace_i915_gem_request_retire(ring, request->seqno);
+
+ /* This is one of the few common intersection points
+ * between legacy ringbuffer submission and execlists:
+ * we need to tell them apart in order to find the correct
+ * ringbuffer to which the request belongs to.
+ */
+ if (intel_enable_execlists(ring->dev)) {
+ struct intel_context *ctx = request->ctx;
+ ringbuf = ctx->engine[ring->id].ringbuf;
+ } else
+ ringbuf = ring->buffer;
+
/* We know the GPU must have read the request to have
* sent us the seqno + interrupt, so use the position
* of tail of the request to update the last known position
* of the GPU head.
*/
- ring->buffer->last_retired_head = request->tail;
+ ringbuf->last_retired_head = request->tail;
i915_gem_free_request(request);
}
diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c
index 3d7fcd6..051e150 100644
--- a/drivers/gpu/drm/i915/intel_lrc.c
+++ b/drivers/gpu/drm/i915/intel_lrc.c
@@ -92,6 +92,113 @@ logical_ringbuf_get(struct intel_engine_cs *ring, struct
intel_context *ctx)
return ctx->engine[ring->id].ringbuf;
}
+static int logical_ring_flush_all_caches(struct intel_engine_cs *ring,
+ struct intel_context *ctx)
+{
+ int ret;
+
+ if (!ring->gpu_caches_dirty)
+ return 0;
+
+ ret = ring->emit_flush(ring, ctx, 0, I915_GEM_GPU_DOMAINS);
+ if (ret)
+ return ret;
+
+ ring->gpu_caches_dirty = false;
+ return 0;
+}
+
+int intel_logical_ring_add_request(struct intel_engine_cs *ring,
+ struct drm_file *file,
+ struct drm_i915_gem_object *obj,
+ u32 *out_seqno)
+{
+ struct drm_i915_private *dev_priv = ring->dev->dev_private;
+ struct intel_context *ctx;
+ struct intel_ringbuffer *ringbuf;
+ struct drm_i915_gem_request *request;
+ u32 request_ring_position, request_start;
+ int ret;
+
+ request = ring->preallocated_lazy_request;
+ if (WARN_ON(request == NULL))
+ return -ENOMEM;
+
+ /* We pre-recorded which context the request belongs to */
+ ctx = request->ctx;
+ if (WARN_ON(ctx == NULL))
+ return -EINVAL;
+ ringbuf = logical_ringbuf_get(ring, ctx);
+
+ request_start = intel_ring_get_tail(ringbuf);
+ /*
+ * Emit any outstanding flushes - execbuf can fail to emit the flush
+ * after having emitted the batchbuffer command. Hence we need to fix
+ * things up similar to emitting the lazy request. The difference here
+ * is that the flush _must_ happen before the next request, no matter
+ * what.
+ */
+ ret = logical_ring_flush_all_caches(ring, ctx);
+ if (ret)
+ return ret;
+
+ /* Record the position of the start of the request so that
+ * should we detect the updated seqno part-way through the
+ * GPU processing the request, we never over-estimate the
+ * position of the head.
+ */
+ request_ring_position = intel_ring_get_tail(ringbuf);
+
+ ret = ring->emit_request(ring, ctx);
+ if (ret)
+ return ret;
+
+ request->seqno = intel_ring_get_seqno(ring);
+ request->ring = ring;
+ request->head = request_start;
+ request->tail = request_ring_position;
+
+ /* Whilst this request exists, batch_obj will be on the
+ * active_list, and so will hold the active reference. Only when this
+ * request is retired will the the batch_obj be moved onto the
+ * inactive_list and lose its active reference. Hence we do not need
+ * to explicitly hold another reference here.
+ */
+ request->batch_obj = obj;
+
+ request->emitted_jiffies = jiffies;
+ list_add_tail(&request->list, &ring->request_list);
+ request->file_priv = NULL;
+
+ if (file) {
+ struct drm_i915_file_private *file_priv = file->driver_priv;
+ WARN_ON(file_priv != ctx->file_priv);
+
+ spin_lock(&file_priv->mm.lock);
+ request->file_priv = file_priv;
+ list_add_tail(&request->client_list,
+ &file_priv->mm.request_list);
+ spin_unlock(&file_priv->mm.lock);
+ }
+
+ ring->outstanding_lazy_seqno = 0;
+ ring->preallocated_lazy_request = NULL;
+
+ if (!dev_priv->ums.mm_suspended) {
+ i915_queue_hangcheck(ring->dev);
+
+ cancel_delayed_work_sync(&dev_priv->mm.idle_work);
+ queue_delayed_work(dev_priv->wq,
+ &dev_priv->mm.retire_work,
+ round_jiffies_up_relative(HZ));
+ intel_mark_busy(dev_priv->dev);
+ }
+
+ if (out_seqno)
+ *out_seqno = request->seqno;
+ return 0;
+}
+
void intel_logical_ring_advance_and_submit(struct intel_engine_cs *ring,
struct intel_context *ctx)
{
@@ -118,6 +225,13 @@ static int logical_ring_alloc_seqno(struct intel_engine_cs
*ring,
if (request == NULL)
return -ENOMEM;
+ /* Hold a reference to the context this request belongs to
+ * (we will need it when the time comes to emit/retire the
+ * request).
+ */
+ request->ctx = ctx;
+ i915_gem_context_reference(request->ctx);
+
ring->preallocated_lazy_request = request;
}
@@ -157,8 +271,6 @@ static int logical_ring_wait_request(struct intel_engine_cs
*ring,
if (ret)
return ret;
- /* TODO: make sure we update the right ringbuffer's last_retired_head
- * when retiring requests */
i915_gem_retire_requests_ring(ring);
ringbuf->head = ringbuf->last_retired_head;
ringbuf->last_retired_head = -1;
diff --git a/drivers/gpu/drm/i915/intel_lrc.h b/drivers/gpu/drm/i915/intel_lrc.h
index 686ebf5..4495359 100644
--- a/drivers/gpu/drm/i915/intel_lrc.h
+++ b/drivers/gpu/drm/i915/intel_lrc.h
@@ -5,6 +5,10 @@
void intel_logical_ring_cleanup(struct intel_engine_cs *ring);
int intel_logical_rings_init(struct drm_device *dev);
+int intel_logical_ring_add_request(struct intel_engine_cs *ring,
+ struct drm_file *file,
+ struct drm_i915_gem_object *obj,
+ u32 *out_seqno);
void intel_logical_ring_advance_and_submit(struct intel_engine_cs *ring,
struct intel_context *ctx);
--
1.9.0
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