diff mbox

[4/4] drm/i915: Subsume intel_ctx_submit_request in to drm_i915_gem_request

Message ID 1418733150-6259-5-git-send-email-nicholas.hoath@intel.com (mailing list archive)
State New, archived
Headers show

Commit Message

Nick Hoath Dec. 16, 2014, 12:32 p.m. UTC 
Move all remaining elements that were unique to execlists queue items
in to the associated request.

Issue: VIZ-4274

v2: Rebase. Fixed issue of overzealous freeing of request.
Signed-off-by: Nick Hoath <nicholas.hoath@intel.com>
---
 drivers/gpu/drm/i915/i915_debugfs.c |  8 +++----
 drivers/gpu/drm/i915/i915_drv.h     | 24 ++++++++++++++++++++
 drivers/gpu/drm/i915/i915_gem.c     |  6 ++---
 drivers/gpu/drm/i915/intel_lrc.c    | 44 +++++++++++++++----------------------
 4 files changed, 49 insertions(+), 33 deletions(-)

Comments

Shuang He Dec. 16, 2014, 5:49 p.m. UTC | #1 
Tested-By: PRC QA PRTS (Patch Regression Test System Contact: shuang.he@intel.com)
-------------------------------------Summary-------------------------------------
Platform          Delta          drm-intel-nightly          Series Applied
PNV                                  364/364              364/364
ILK              +3-3              360/366              360/366
SNB                                  448/450              448/450
IVB                                  497/498              497/498
BYT                                  289/289              289/289
HSW                                  563/564              563/564
BDW                                  417/417              417/417
-------------------------------------Detailed-------------------------------------
Platform  Test                                drm-intel-nightly          Series Applied
 ILK  igt_drv_suspend_fence-restore-untiled      DMESG_WARN(1, M26)PASS(10, M37M26)      PASS(1, M26)
 ILK  igt_kms_flip_bcs-flip-vs-modeset-interruptible      DMESG_WARN(1, M26)PASS(10, M37M26)      PASS(1, M26)
*ILK  igt_kms_flip_flip-vs-dpms-interruptible      PASS(1, M26)      DMESG_WARN(1, M26)
*ILK  igt_kms_flip_plain-flip-fb-recreate-interruptible      PASS(1, M26)      DMESG_WARN(1, M26)
 ILK  igt_kms_flip_rcs-flip-vs-dpms      DMESG_WARN(1, M26)PASS(9, M37M26)      PASS(1, M26)
*ILK  igt_kms_flip_vblank-vs-hang      PASS(1, M26)      DMESG_WARN(1, M26)
Note: You need to pay more attention to line start with '*'
Daniel Vetter Dec. 17, 2014, 8:39 p.m. UTC | #2 
On Tue, Dec 16, 2014 at 12:32:30PM +0000, Nick Hoath wrote:
> diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
> index d68c75f..114adc3 100644
> --- a/drivers/gpu/drm/i915/i915_drv.h
> +++ b/drivers/gpu/drm/i915/i915_drv.h
> @@ -2036,6 +2036,30 @@ struct drm_i915_gem_request {
>  	struct list_head client_list;
>  
>  	uint32_t uniq;
> +
> +	/**
> +	 * The ELSP only accepts two elements at a time, so we queue
> +	 * context/tail pairs on a given queue (ring->execlist_queue) until the
> +	 * hardware is available. The queue serves a double purpose: we also use
> +	 * it to keep track of the up to 2 contexts currently in the hardware
> +	 * (usually one in execution and the other queued up by the GPU): We
> +	 * only remove elements from the head
> +	 * of the queue when the hardware informs us that an element has been
> +	 * completed.
> +	 *
> +	 * All accesses to the queue are mediated by a spinlock
> +	 * (ring->execlist_lock).
> +	 */
> +
> +	/** Execlist link in the submission queue.*/
> +	struct list_head execlist_link;
> +
> +	/** Execlists workqueue for processing this request in a bottom half */
> +	struct work_struct work;

Hm I've thought this would drop out with the other rework we've had
floating around. It's also not used anywhere, so I guess it disappeared
for real and is just a leftover from rebasing?

Otherwise I guess this is ready for final review I think.
-Daniel
Daniel Vetter Dec. 17, 2014, 8:42 p.m. UTC | #3 
On Wed, Dec 17, 2014 at 09:39:46PM +0100, Daniel Vetter wrote:
> On Tue, Dec 16, 2014 at 12:32:30PM +0000, Nick Hoath wrote:
> > diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
> > index d68c75f..114adc3 100644
> > --- a/drivers/gpu/drm/i915/i915_drv.h
> > +++ b/drivers/gpu/drm/i915/i915_drv.h
> > @@ -2036,6 +2036,30 @@ struct drm_i915_gem_request {
> >  	struct list_head client_list;
> >  
> >  	uint32_t uniq;
> > +
> > +	/**
> > +	 * The ELSP only accepts two elements at a time, so we queue
> > +	 * context/tail pairs on a given queue (ring->execlist_queue) until the
> > +	 * hardware is available. The queue serves a double purpose: we also use
> > +	 * it to keep track of the up to 2 contexts currently in the hardware
> > +	 * (usually one in execution and the other queued up by the GPU): We
> > +	 * only remove elements from the head
> > +	 * of the queue when the hardware informs us that an element has been
> > +	 * completed.
> > +	 *
> > +	 * All accesses to the queue are mediated by a spinlock
> > +	 * (ring->execlist_lock).
> > +	 */
> > +
> > +	/** Execlist link in the submission queue.*/
> > +	struct list_head execlist_link;
> > +
> > +	/** Execlists workqueue for processing this request in a bottom half */
> > +	struct work_struct work;
> 
> Hm I've thought this would drop out with the other rework we've had
> floating around. It's also not used anywhere, so I guess it disappeared
> for real and is just a leftover from rebasing?

And a plea from your maintainer: I've asked for exactly this in my reply,
but there was no reply from you nor any mention about anything in the
in-patch changelog. So I had to digg through all the patches and the old
thread to figure out again what it is my subconscious told me is missing.

This isn't efficient, so please always acknowledge review feedbacka and
questions either with a reply or in the commit message changelogs (there
it needs the name of the reviewer in case there was lots of feedback.)

Thanks, Daniel
diff mbox

Patch

diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index 3fc8508..4470fbe 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -1875,7 +1875,7 @@  static int i915_execlists(struct seq_file *m, void *data)
 	intel_runtime_pm_get(dev_priv);
 
 	for_each_ring(ring, dev_priv, ring_id) {
-		struct intel_ctx_submit_request *head_req = NULL;
+		struct drm_i915_gem_request *head_req = NULL;
 		int count = 0;
 		unsigned long flags;
 
@@ -1908,18 +1908,18 @@  static int i915_execlists(struct seq_file *m, void *data)
 		list_for_each(cursor, &ring->execlist_queue)
 			count++;
 		head_req = list_first_entry_or_null(&ring->execlist_queue,
-				struct intel_ctx_submit_request, execlist_link);
+				struct drm_i915_gem_request, execlist_link);
 		spin_unlock_irqrestore(&ring->execlist_lock, flags);
 
 		seq_printf(m, "\t%d requests in queue\n", count);
 		if (head_req) {
 			struct drm_i915_gem_object *ctx_obj;
 
-			ctx_obj = head_req->request->ctx->engine[ring_id].state;
+			ctx_obj = head_req->ctx->engine[ring_id].state;
 			seq_printf(m, "\tHead request id: %u\n",
 				   intel_execlists_ctx_id(ctx_obj));
 			seq_printf(m, "\tHead request tail: %u\n",
-				   head_req->request->tail);
+				   head_req->tail);
 		}
 
 		seq_putc(m, '\n');
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index d68c75f..114adc3 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -2036,6 +2036,30 @@  struct drm_i915_gem_request {
 	struct list_head client_list;
 
 	uint32_t uniq;
+
+	/**
+	 * The ELSP only accepts two elements at a time, so we queue
+	 * context/tail pairs on a given queue (ring->execlist_queue) until the
+	 * hardware is available. The queue serves a double purpose: we also use
+	 * it to keep track of the up to 2 contexts currently in the hardware
+	 * (usually one in execution and the other queued up by the GPU): We
+	 * only remove elements from the head
+	 * of the queue when the hardware informs us that an element has been
+	 * completed.
+	 *
+	 * All accesses to the queue are mediated by a spinlock
+	 * (ring->execlist_lock).
+	 */
+
+	/** Execlist link in the submission queue.*/
+	struct list_head execlist_link;
+
+	/** Execlists workqueue for processing this request in a bottom half */
+	struct work_struct work;
+
+	/** Execlists no. of times this request has been sent to the ELSP */
+	int elsp_submitted;
+
 };
 
 void i915_gem_request_free(struct kref *req_ref);
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 50034c4..aa737fb 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -2658,14 +2658,14 @@  static void i915_gem_reset_ring_cleanup(struct drm_i915_private *dev_priv,
 	 * pinned in place.
 	 */
 	while (!list_empty(&ring->execlist_queue)) {
-		struct intel_ctx_submit_request *submit_req;
+		struct drm_i915_gem_request *submit_req;
 
 		submit_req = list_first_entry(&ring->execlist_queue,
-				struct intel_ctx_submit_request,
+				struct drm_i915_gem_request,
 				execlist_link);
 		list_del(&submit_req->execlist_link);
 		intel_runtime_pm_put(dev_priv);
-		i915_gem_context_unreference(submit_req->request->ctx);
+		i915_gem_context_unreference(submit_req->ctx);
 		kfree(submit_req);
 	}
 
diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c
index 99fcb56..c312a83 100644
--- a/drivers/gpu/drm/i915/intel_lrc.c
+++ b/drivers/gpu/drm/i915/intel_lrc.c
@@ -405,8 +405,8 @@  static void execlists_submit_contexts(struct intel_engine_cs *ring,
 
 static void execlists_context_unqueue(struct intel_engine_cs *ring)
 {
-	struct intel_ctx_submit_request *req0 = NULL, *req1 = NULL;
-	struct intel_ctx_submit_request *cursor = NULL, *tmp = NULL;
+	struct drm_i915_gem_request *req0 = NULL, *req1 = NULL;
+	struct drm_i915_gem_request *cursor = NULL, *tmp = NULL;
 
 	assert_spin_locked(&ring->execlist_lock);
 
@@ -418,7 +418,7 @@  static void execlists_context_unqueue(struct intel_engine_cs *ring)
 				 execlist_link) {
 		if (!req0) {
 			req0 = cursor;
-		} else if (req0->request->ctx == cursor->request->ctx) {
+		} else if (req0->ctx == cursor->ctx) {
 			/* Same ctx: ignore first request, as second request
 			 * will update tail past first request's workload */
 			cursor->elsp_submitted = req0->elsp_submitted;
@@ -434,9 +434,9 @@  static void execlists_context_unqueue(struct intel_engine_cs *ring)
 
 	WARN_ON(req1 && req1->elsp_submitted);
 
-	execlists_submit_contexts(ring, req0->request->ctx, req0->request->tail,
-				  req1 ? req1->request->ctx : NULL,
-				  req1 ? req1->request->tail : 0);
+	execlists_submit_contexts(ring, req0->ctx, req0->tail,
+				  req1 ? req1->ctx : NULL,
+				  req1 ? req1->tail : 0);
 
 	req0->elsp_submitted++;
 	if (req1)
@@ -446,17 +446,17 @@  static void execlists_context_unqueue(struct intel_engine_cs *ring)
 static bool execlists_check_remove_request(struct intel_engine_cs *ring,
 					   u32 request_id)
 {
-	struct intel_ctx_submit_request *head_req;
+	struct drm_i915_gem_request *head_req;
 
 	assert_spin_locked(&ring->execlist_lock);
 
 	head_req = list_first_entry_or_null(&ring->execlist_queue,
-					    struct intel_ctx_submit_request,
+					    struct drm_i915_gem_request,
 					    execlist_link);
 
 	if (head_req != NULL) {
 		struct drm_i915_gem_object *ctx_obj =
-				head_req->request->ctx->engine[ring->id].state;
+				head_req->ctx->engine[ring->id].state;
 		if (intel_execlists_ctx_id(ctx_obj) == request_id) {
 			WARN(head_req->elsp_submitted == 0,
 			     "Never submitted head request\n");
@@ -538,17 +538,11 @@  static int execlists_context_queue(struct intel_engine_cs *ring,
 				   u32 tail,
 				   struct drm_i915_gem_request *request)
 {
-	struct intel_ctx_submit_request *req = NULL, *cursor;
+	struct drm_i915_gem_request *cursor;
 	struct drm_i915_private *dev_priv = ring->dev->dev_private;
 	unsigned long flags;
 	int num_elements = 0;
 
-	req = kzalloc(sizeof(*req), GFP_KERNEL);
-	if (req == NULL)
-		return -ENOMEM;
-	req->ctx = to;
-	i915_gem_context_reference(req->ctx);
-
 	if (to != ring->default_context)
 		intel_lr_context_pin(ring, to);
 
@@ -566,9 +560,8 @@  static int execlists_context_queue(struct intel_engine_cs *ring,
 	} else {
 		WARN_ON(to != request->ctx);
 	}
-	req->request = request;
 	i915_gem_request_reference(request);
-	i915_gem_context_reference(req->request->ctx);
+	i915_gem_context_reference(request->ctx);
 
 	intel_runtime_pm_get(dev_priv);
 
@@ -579,13 +572,13 @@  static int execlists_context_queue(struct intel_engine_cs *ring,
 			break;
 
 	if (num_elements > 2) {
-		struct intel_ctx_submit_request *tail_req;
+		struct drm_i915_gem_request *tail_req;
 
 		tail_req = list_last_entry(&ring->execlist_queue,
-					   struct intel_ctx_submit_request,
+					   struct drm_i915_gem_request,
 					   execlist_link);
 
-		if (to == tail_req->request->ctx) {
+		if (to == tail_req->ctx) {
 			WARN(tail_req->elsp_submitted != 0,
 				"More than 2 already-submitted reqs queued\n");
 			list_del(&tail_req->execlist_link);
@@ -594,7 +587,7 @@  static int execlists_context_queue(struct intel_engine_cs *ring,
 		}
 	}
 
-	list_add_tail(&req->execlist_link, &ring->execlist_queue);
+	list_add_tail(&request->execlist_link, &ring->execlist_queue);
 	if (num_elements == 0)
 		execlists_context_unqueue(ring);
 
@@ -763,7 +756,7 @@  int intel_execlists_submission(struct drm_device *dev, struct drm_file *file,
 
 void intel_execlists_retire_requests(struct intel_engine_cs *ring)
 {
-	struct intel_ctx_submit_request *req, *tmp;
+	struct drm_i915_gem_request *req, *tmp;
 	struct drm_i915_private *dev_priv = ring->dev->dev_private;
 	unsigned long flags;
 	struct list_head retired_list;
@@ -778,7 +771,7 @@  void intel_execlists_retire_requests(struct intel_engine_cs *ring)
 	spin_unlock_irqrestore(&ring->execlist_lock, flags);
 
 	list_for_each_entry_safe(req, tmp, &retired_list, execlist_link) {
-		struct intel_context *ctx = req->request->ctx;
+		struct intel_context *ctx = req->ctx;
 		struct drm_i915_gem_object *ctx_obj =
 				ctx->engine[ring->id].state;
 
@@ -786,9 +779,8 @@  void intel_execlists_retire_requests(struct intel_engine_cs *ring)
 			intel_lr_context_unpin(ring, ctx);
 		intel_runtime_pm_put(dev_priv);
 		i915_gem_context_unreference(ctx);
-		i915_gem_request_unreference(req->request);
+		i915_gem_request_unreference(req);
 		list_del(&req->execlist_link);
-		kfree(req);
 	}
 }