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From: Jason Ekstrand <jason@jlekstrand.net>
To: intel-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org
Cc: Jason Ekstrand <jason@jlekstrand.net>
Subject: [PATCH 10/25] drm/i915/gem: Remove engine auto-magic with FENCE_SUBMIT
Date: Thu, 29 Apr 2021 14:03:25 -0500	[thread overview]
Message-ID: <20210429190340.1555632-11-jason@jlekstrand.net> (raw)
In-Reply-To: <20210429190340.1555632-1-jason@jlekstrand.net>

Even though FENCE_SUBMIT is only documented to wait until the request in
the in-fence starts instead of waiting until it completes, it has a bit
more magic than that.  If FENCE_SUBMIT is used to submit something to a
balanced engine, we would wait to assign engines until the primary
request was ready to start and then attempt to assign it to a different
engine than the primary.  There is an IGT test which exercises this by
submitting a primary batch to a specific VCS and then using FENCE_SUBMIT
to submit a secondary which can run on any VCS and have i915 figure out
which VCS to run it on such that they can run in parallel.

However, this functionality has never been used in the real world.  The
media driver (the only user of FENCE_SUBMIT) always picks exactly two
physical engines to bond and never asks us to pick which to use.

Signed-off-by: Jason Ekstrand <jason@jlekstrand.net>
---
 drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c  |  2 +-
 drivers/gpu/drm/i915/gt/intel_engine_types.h    |  7 -------
 .../drm/i915/gt/intel_execlists_submission.c    | 17 -----------------
 3 files changed, 1 insertion(+), 25 deletions(-)

diff --git a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
index d640bba6ad9ab..efb2fa3522a42 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
@@ -3474,7 +3474,7 @@ i915_gem_do_execbuffer(struct drm_device *dev,
 		if (args->flags & I915_EXEC_FENCE_SUBMIT)
 			err = i915_request_await_execution(eb.request,
 							   in_fence,
-							   eb.engine->bond_execute);
+							   NULL);
 		else
 			err = i915_request_await_dma_fence(eb.request,
 							   in_fence);
diff --git a/drivers/gpu/drm/i915/gt/intel_engine_types.h b/drivers/gpu/drm/i915/gt/intel_engine_types.h
index 883bafc449024..68cfe5080325c 100644
--- a/drivers/gpu/drm/i915/gt/intel_engine_types.h
+++ b/drivers/gpu/drm/i915/gt/intel_engine_types.h
@@ -446,13 +446,6 @@ struct intel_engine_cs {
 	 */
 	void		(*submit_request)(struct i915_request *rq);
 
-	/*
-	 * Called on signaling of a SUBMIT_FENCE, passing along the signaling
-	 * request down to the bonded pairs.
-	 */
-	void            (*bond_execute)(struct i915_request *rq,
-					struct dma_fence *signal);
-
 	/*
 	 * Call when the priority on a request has changed and it and its
 	 * dependencies may need rescheduling. Note the request itself may
diff --git a/drivers/gpu/drm/i915/gt/intel_execlists_submission.c b/drivers/gpu/drm/i915/gt/intel_execlists_submission.c
index 14378b28169b7..635d6d2494d26 100644
--- a/drivers/gpu/drm/i915/gt/intel_execlists_submission.c
+++ b/drivers/gpu/drm/i915/gt/intel_execlists_submission.c
@@ -3547,22 +3547,6 @@ static void virtual_submit_request(struct i915_request *rq)
 	spin_unlock_irqrestore(&ve->base.active.lock, flags);
 }
 
-static void
-virtual_bond_execute(struct i915_request *rq, struct dma_fence *signal)
-{
-	intel_engine_mask_t allowed, exec;
-
-	allowed = ~to_request(signal)->engine->mask;
-
-	/* Restrict the bonded request to run on only the available engines */
-	exec = READ_ONCE(rq->execution_mask);
-	while (!try_cmpxchg(&rq->execution_mask, &exec, exec & allowed))
-		;
-
-	/* Prevent the master from being re-run on the bonded engines */
-	to_request(signal)->execution_mask &= ~allowed;
-}
-
 struct intel_context *
 intel_execlists_create_virtual(struct intel_engine_cs **siblings,
 			       unsigned int count)
@@ -3616,7 +3600,6 @@ intel_execlists_create_virtual(struct intel_engine_cs **siblings,
 
 	ve->base.schedule = i915_schedule;
 	ve->base.submit_request = virtual_submit_request;
-	ve->base.bond_execute = virtual_bond_execute;
 
 	INIT_LIST_HEAD(virtual_queue(ve));
 	ve->base.execlists.queue_priority_hint = INT_MIN;
-- 
2.31.1

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  parent reply	other threads:[~2021-04-29 19:04 UTC|newest]

Thread overview: 26+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-29 19:03 [PATCH 00/25] drm/i915/gem: ioctl clean-ups (v4) Jason Ekstrand
2021-04-29 19:03 ` [PATCH 01/25] drm/i915: Drop I915_CONTEXT_PARAM_RINGSIZE Jason Ekstrand
2021-04-29 19:03 ` [PATCH 02/25] drm/i915: Stop storing the ring size in the ring pointer Jason Ekstrand
2021-04-29 19:03 ` [PATCH 03/25] drm/i915: Drop I915_CONTEXT_PARAM_NO_ZEROMAP Jason Ekstrand
2021-04-29 19:03 ` [PATCH 04/25] drm/i915/gem: Set the watchdog timeout directly in intel_context_set_gem (v2) Jason Ekstrand
2021-04-29 19:03 ` [PATCH 05/25] drm/i915/gem: Return void from context_apply_all Jason Ekstrand
2021-04-29 19:03 ` [PATCH 06/25] drm/i915: Drop the CONTEXT_CLONE API Jason Ekstrand
2021-04-29 19:03 ` [PATCH 07/25] drm/i915: Implement SINGLE_TIMELINE with a syncobj (v4) Jason Ekstrand
2021-04-29 19:03 ` [PATCH 08/25] drm/i915: Drop getparam support for I915_CONTEXT_PARAM_ENGINES Jason Ekstrand
2021-04-29 19:03 ` [PATCH 09/25] drm/i915/gem: Disallow bonding of virtual engines (v3) Jason Ekstrand
2021-04-29 19:03 ` Jason Ekstrand [this message]
2021-04-29 19:03 ` [PATCH 11/25] drm/i915/request: Remove the hook from await_execution Jason Ekstrand
2021-04-29 19:03 ` [PATCH 12/25] drm/i915/gem: Disallow creating contexts with too many engines Jason Ekstrand
2021-04-29 19:03 ` [PATCH 13/25] drm/i915: Stop manually RCU banging in reset_stats_ioctl (v2) Jason Ekstrand
2021-04-29 19:03 ` [PATCH 14/25] drm/i915/gem: Add a separate validate_priority helper Jason Ekstrand
2021-04-29 19:03 ` [PATCH 15/25] drm/i915: Add gem/i915_gem_context.h to the docs Jason Ekstrand
2021-04-29 19:03 ` [PATCH 16/25] drm/i915/gem: Add an intermediate proto_context struct Jason Ekstrand
2021-04-29 19:03 ` [PATCH 17/25] drm/i915/gem: Use the proto-context to handle create parameters Jason Ekstrand
2021-04-29 19:03 ` [PATCH 18/25] drm/i915/gem: Return an error ptr from context_lookup Jason Ekstrand
2021-04-29 19:03 ` [PATCH 19/25] drm/i915/gt: Drop i915_address_space::file (v2) Jason Ekstrand
2021-04-29 19:03 ` [PATCH 20/25] drm/i915/gem: Delay context creation Jason Ekstrand
2021-04-29 19:03 ` [PATCH 21/25] drm/i915/gem: Don't allow changing the VM on running contexts Jason Ekstrand
2021-04-29 19:03 ` [PATCH 22/25] drm/i915/gem: Don't allow changing the engine set " Jason Ekstrand
2021-04-29 19:03 ` [PATCH 23/25] drm/i915/selftests: Take a VM in kernel_context() Jason Ekstrand
2021-04-29 19:03 ` [PATCH 24/25] i915/gem/selftests: Assign the VM at context creation in igt_shared_ctx_exec Jason Ekstrand
2021-04-29 19:03 ` [PATCH 25/25] drm/i915/gem: Roll all of context creation together Jason Ekstrand

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