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From: Chris Wilson <chris@chris-wilson.co.uk>
To: intel-gfx@lists.freedesktop.org
Cc: Kenneth Graunke <kenneth@whitecape.org>
Subject: [Intel-gfx] [PATCH 11/14] drm/i915/gt: Declare when we enabled timeslicing
Date: Mon, 24 Feb 2020 10:00:04 +0000	[thread overview]
Message-ID: <20200224100007.4024184-11-chris@chris-wilson.co.uk> (raw)
In-Reply-To: <20200224100007.4024184-1-chris@chris-wilson.co.uk>

Let userspace know if they can trust timeslicing by including it as part
of the I915_PARAM_HAS_SCHEDULER::I915_SCHEDULER_CAP_TIMESLICING

v2: Only declare timeslicing if we can safely preempt userspace.

Fixes: 8ee36e048c98 ("drm/i915/execlists: Minimalistic timeslicing")
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Kenneth Graunke <kenneth@whitecape.org>
---
 drivers/gpu/drm/i915/gt/intel_engine.h      | 3 ++-
 drivers/gpu/drm/i915/gt/intel_engine_user.c | 5 +++++
 include/uapi/drm/i915_drm.h                 | 1 +
 3 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/gt/intel_engine.h b/drivers/gpu/drm/i915/gt/intel_engine.h
index 29c8c03c5caa..a32dc82a90d4 100644
--- a/drivers/gpu/drm/i915/gt/intel_engine.h
+++ b/drivers/gpu/drm/i915/gt/intel_engine.h
@@ -326,7 +326,8 @@ intel_engine_has_timeslices(const struct intel_engine_cs *engine)
 	if (!IS_ACTIVE(CONFIG_DRM_I915_TIMESLICE_DURATION))
 		return false;
 
-	return intel_engine_has_semaphores(engine);
+	return (intel_engine_has_semaphores(engine) &&
+		intel_engine_has_preemption(engine));
 }
 
 #endif /* _INTEL_RINGBUFFER_H_ */
diff --git a/drivers/gpu/drm/i915/gt/intel_engine_user.c b/drivers/gpu/drm/i915/gt/intel_engine_user.c
index 848decee9066..b84fdd722781 100644
--- a/drivers/gpu/drm/i915/gt/intel_engine_user.c
+++ b/drivers/gpu/drm/i915/gt/intel_engine_user.c
@@ -121,6 +121,11 @@ static void set_scheduler_caps(struct drm_i915_private *i915)
 			else
 				disabled |= BIT(map[i].sched);
 		}
+
+		if (intel_engine_has_timeslices(engine))
+			enabled |= I915_SCHEDULER_CAP_TIMESLICING;
+		else
+			disabled |= I915_SCHEDULER_CAP_TIMESLICING;
 	}
 
 	i915->caps.scheduler = enabled & ~disabled;
diff --git a/include/uapi/drm/i915_drm.h b/include/uapi/drm/i915_drm.h
index 2813e579b480..4f903431a3fe 100644
--- a/include/uapi/drm/i915_drm.h
+++ b/include/uapi/drm/i915_drm.h
@@ -523,6 +523,7 @@ typedef struct drm_i915_irq_wait {
 #define   I915_SCHEDULER_CAP_PREEMPTION	(1ul << 2)
 #define   I915_SCHEDULER_CAP_SEMAPHORES	(1ul << 3)
 #define   I915_SCHEDULER_CAP_ENGINE_BUSY_STATS	(1ul << 4)
+#define   I915_SCHEDULER_CAP_TIMESLICING	(1ul << 5)
 
 #define I915_PARAM_HUC_STATUS		 42
 
-- 
2.25.1

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  parent reply	other threads:[~2020-02-24 10:00 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-02-24  9:59 [Intel-gfx] [PATCH 01/14] drm/i915/selftests: Verify LRC isolation Chris Wilson
2020-02-24  9:59 ` [Intel-gfx] [PATCH 02/14] drm/i915/selftests: Check recovery from corrupted LRC Chris Wilson
2020-02-24  9:59 ` [Intel-gfx] [PATCH 03/14] drm/i915: Flush idle barriers when waiting Chris Wilson
2020-02-25 19:07   ` Tvrtko Ursulin
2020-02-25 19:16     ` Chris Wilson
2020-02-24  9:59 ` [Intel-gfx] [PATCH 04/14] drm/i915: Allow userspace to specify ringsize on construction Chris Wilson
2020-02-24  9:59 ` [Intel-gfx] [PATCH 05/14] drm/i915/gem: Honour O_NONBLOCK before throttling execbuf submissions Chris Wilson
2020-02-24  9:59 ` [Intel-gfx] [PATCH 06/14] drm/i915/selftests: Be a little more lenient for reset workers Chris Wilson
2020-02-24 10:00 ` [Intel-gfx] [PATCH 07/14] drm/i915: Protect i915_request_await_start from early waits Chris Wilson
2020-02-24 10:00 ` [Intel-gfx] [PATCH 08/14] drm/i915/gem: Consolidate ctx->engines[] release Chris Wilson
2020-02-24 10:00 ` [Intel-gfx] [PATCH 09/14] drm/i915/gt: Prevent allocation on a banned context Chris Wilson
2020-02-24 10:00 ` [Intel-gfx] [PATCH 10/14] drm/i915/gem: Check that the context wasn't closed during setup Chris Wilson
2020-02-24 10:00 ` Chris Wilson [this message]
2020-02-24 10:00 ` [Intel-gfx] [PATCH 12/14] drm/i915/gt: Yield the timeslice if caught waiting on a user semaphore Chris Wilson
2020-02-24 10:00 ` [Intel-gfx] [PATCH 13/14] drm/i915/execlists: Check the sentinel is alone in the ELSP Chris Wilson
2020-02-24 10:00 ` [Intel-gfx] [PATCH 14/14] drm/i915/execlists: Reduce preempt-to-busy roundtrip delay Chris Wilson
2020-02-24 10:59 ` [Intel-gfx] ✗ Fi.CI.CHECKPATCH: warning for series starting with [01/14] drm/i915/selftests: Verify LRC isolation Patchwork
2020-02-24 13:17 ` [Intel-gfx] ✗ Fi.CI.BAT: failure " Patchwork
2020-05-03 11:21 [Intel-gfx] [PATCH 01/14] drm/i915/gem: Specify address type for chained reloc batches Chris Wilson
2020-05-03 11:21 ` [Intel-gfx] [PATCH 11/14] drm/i915/gt: Declare when we enabled timeslicing Chris Wilson
2020-05-05 21:52 [PATCH 01/14] drm/i915: Mark concurrent submissions with a weak-dependency Chris Wilson
2020-05-05 21:52 ` [Intel-gfx] [PATCH 11/14] drm/i915/gt: Declare when we enabled timeslicing Chris Wilson

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