On 02/11/2016 17:50, Chris Wilson wrote:
Defer the transfer from the client's timeline onto the execution
timeline from the point of readiness to the point of actual submission.
For example, in execlists, a request is finally submitted to hardware
when the hardware is ready, and only put onto the hardware queue when
the request is ready. By deferring the transfer, we ensure that the
timeline is maintained in retirement order if we decide to queue the
requests onto the hardware in a different order than fifo.
Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/i915/i915_gem_request.c | 36 ++++++++++++++++++------------
drivers/gpu/drm/i915/i915_gem_request.h | 2 ++
drivers/gpu/drm/i915/i915_guc_submission.c | 2 ++
drivers/gpu/drm/i915/intel_lrc.c | 5 +++++
drivers/gpu/drm/i915/intel_ringbuffer.c | 2 ++
5 files changed, 33 insertions(+), 14 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_gem_request.c b/drivers/gpu/drm/i915/i915_gem_request.c
index 1ae5a2f8953f..05544dec5de9 100644
--- a/drivers/gpu/drm/i915/i915_gem_request.c
+++ b/drivers/gpu/drm/i915/i915_gem_request.c
@@ -307,25 +307,16 @@ static u32 timeline_get_seqno(struct i915_gem_timeline *tl)
return atomic_inc_return(&tl->next_seqno);
}
-static int __i915_sw_fence_call
-submit_notify(struct i915_sw_fence *fence, enum i915_sw_fence_notify state)
+void __i915_gem_request_submit(struct drm_i915_gem_request *request)
{
- struct drm_i915_gem_request *request =
- container_of(fence, typeof(*request), submit);
struct intel_engine_cs *engine = request->engine;
struct intel_timeline *timeline;
- unsigned long flags;
u32 seqno;
- if (state != FENCE_COMPLETE)
- return NOTIFY_DONE;
-
/* Transfer from per-context onto the global per-engine timeline */
timeline = engine->timeline;
GEM_BUG_ON(timeline == request->timeline);
-
- /* Will be called from irq-context when using foreign DMA fences */
- spin_lock_irqsave(&timeline->lock, flags);
+ assert_spin_locked(&timeline->lock);
seqno = timeline_get_seqno(timeline->common);
GEM_BUG_ON(!seqno);
@@ -345,15 +336,32 @@ submit_notify(struct i915_sw_fence *fence, enum i915_sw_fence_notify state)
GEM_BUG_ON(!request->global_seqno);
engine->emit_breadcrumb(request,
request->ring->vaddr + request->postfix);
- engine->submit_request(request);
- spin_lock_nested(&request->timeline->lock, SINGLE_DEPTH_NESTING);
+ /* nested from submit_notify */
+ spin_lock_nested(&request->timeline->lock, 2);
Is this because lockdep does not differentiate between
request->timeline->lock and engine->timeline->lock?
Could we pass different lock classes to i915_gem_timeline_init and
remove this deep nested annotation. Would be better I think.
list_move_tail(&request->link, &timeline->requests);
spin_unlock(&request->timeline->lock);
i915_sw_fence_commit(&request->execute);
+}
- spin_unlock_irqrestore(&timeline->lock, flags);
+static int __i915_sw_fence_call
+submit_notify(struct i915_sw_fence *fence, enum i915_sw_fence_notify state)
+{
+ if (state == FENCE_COMPLETE) {
+ struct drm_i915_gem_request *request =
+ container_of(fence, typeof(*request), submit);
+ struct intel_engine_cs *engine = request->engine;
+ unsigned long flags;
+
+ /* Will be called from irq-context when using foreign fences,
+ * and may be called from the execution callback of another
+ * engine.
+ */
+ spin_lock_irqsave_nested(&engine->timeline->lock, flags, 1);
+ engine->submit_request(request);
+ spin_unlock_irqrestore(&engine->timeline->lock, flags);
+ }
return NOTIFY_DONE;
}
diff --git a/drivers/gpu/drm/i915/i915_gem_request.h b/drivers/gpu/drm/i915/i915_gem_request.h
index ed13f37fea0f..725d04128eaf 100644
--- a/drivers/gpu/drm/i915/i915_gem_request.h
+++ b/drivers/gpu/drm/i915/i915_gem_request.h
@@ -228,6 +228,8 @@ void __i915_add_request(struct drm_i915_gem_request *req, bool flush_caches);
#define i915_add_request_no_flush(req) \
__i915_add_request(req, false)
+void __i915_gem_request_submit(struct drm_i915_gem_request *request);
+
struct intel_rps_client;
#define NO_WAITBOOST ERR_PTR(-1)
#define IS_RPS_CLIENT(p) (!IS_ERR(p))
diff --git a/drivers/gpu/drm/i915/i915_guc_submission.c b/drivers/gpu/drm/i915/i915_guc_submission.c
index 857ef914cae7..ddb574d5ceda 100644
--- a/drivers/gpu/drm/i915/i915_guc_submission.c
+++ b/drivers/gpu/drm/i915/i915_guc_submission.c
@@ -640,6 +640,8 @@ static void i915_guc_submit(struct drm_i915_gem_request *rq)
struct i915_guc_client *client = guc->execbuf_client;
int b_ret;
+ __i915_gem_request_submit(rq);
+
spin_lock(&client->wq_lock);
guc_wq_item_append(client, rq);
diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c
index fa3012c342cc..b9aba16851ac 100644
--- a/drivers/gpu/drm/i915/intel_lrc.c
+++ b/drivers/gpu/drm/i915/intel_lrc.c
@@ -434,6 +434,7 @@ static void execlists_dequeue(struct intel_engine_cs *engine)
{
struct drm_i915_gem_request *cursor, *last;
struct execlist_port *port = engine->execlist_port;
+ unsigned long flags;
bool submit = false;
last = port->request;
@@ -469,6 +470,7 @@ static void execlists_dequeue(struct intel_engine_cs *engine)
* and context switches) submission.
*/
+ spin_lock_irqsave(&engine->timeline->lock, flags);
spin_lock(&engine->execlist_lock);
list_for_each_entry(cursor, &engine->execlist_queue, execlist_link) {
/* Can we combine this request with the current port? It has to
@@ -501,6 +503,8 @@ static void execlists_dequeue(struct intel_engine_cs *engine)
i915_gem_request_assign(&port->request, last);
port++;
}
+
+ __i915_gem_request_submit(cursor);
last = cursor;
submit = true;
}
@@ -512,6 +516,7 @@ static void execlists_dequeue(struct intel_engine_cs *engine)
i915_gem_request_assign(&port->request, last);
}
spin_unlock(&engine->execlist_lock);
+ spin_unlock_irqrestore(&engine->timeline->lock, flags);
if (submit)
execlists_submit_ports(engine);
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c
index 700e93d80616..f91ee24e2763 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.c
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
@@ -1294,6 +1294,8 @@ static void i9xx_submit_request(struct drm_i915_gem_request *request)
{
struct drm_i915_private *dev_priv = request->i915;
+ __i915_gem_request_submit(request);
+
I915_WRITE_TAIL(request->engine, request->tail);
}
Otherwise looking good to me.
Regards,
Tvrtko
_______________________________________________
Intel-gfx mailing list
Intel-gfx@xxxxxxxxxxxxxxxxxxxxx
https://lists.freedesktop.org/mailman/listinfo/intel-gfx
