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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 21/24] drm/i915/gt: Declare when we enabled timeslicing
Date: Fri, 28 Feb 2020 08:23:27 +0000	[thread overview]
Message-ID: <20200228082330.2411941-21-chris@chris-wilson.co.uk> (raw)
In-Reply-To: <20200228082330.2411941-1-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:[~2020-02-28  8:24 UTC|newest]

Thread overview: 29+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-02-28  8:23 [Intel-gfx] [PATCH 01/24] drm/i915/gt: Check engine-is-awake on reset later Chris Wilson
2020-02-28  8:23 ` [Intel-gfx] [PATCH 02/24] drm/i915: Skip barriers inside waits Chris Wilson
2020-02-28  8:23 ` [Intel-gfx] [PATCH 03/24] drm/i915/perf: Mark up the racy use of perf->exclusive_stream Chris Wilson
2020-02-28  8:23 ` [Intel-gfx] [PATCH 04/24] drm/i915/perf: Manually acquire engine-wakeref around use of kernel_context Chris Wilson
2020-02-28  8:23 ` [Intel-gfx] [PATCH 05/24] drm/i915/perf: Reintroduce wait on OA configuration completion Chris Wilson
2020-02-28  8:23 ` [Intel-gfx] [PATCH 06/24] drm/i915: Wrap i915_active in a simple kreffed struct Chris Wilson
2020-02-28  8:23 ` [Intel-gfx] [PATCH 07/24] drm/i915: Extend i915_request_await_active to use all timelines Chris Wilson
2020-02-28  8:23 ` [Intel-gfx] [PATCH 08/24] drm/i915/perf: Schedule oa_config after modifying the contexts Chris Wilson
2020-02-28  8:23 ` [Intel-gfx] [PATCH 09/24] drm/i915/gem: Consolidate ctx->engines[] release Chris Wilson
2020-02-28  8:23 ` [Intel-gfx] [PATCH 10/24] drm/i915/gt: Prevent allocation on a banned context Chris Wilson
2020-02-28  8:23 ` [Intel-gfx] [PATCH 11/24] drm/i915/gem: Check that the context wasn't closed during setup Chris Wilson
2020-02-28  8:23 ` [Intel-gfx] [PATCH 12/24] drm/i915/selftests: Disable heartbeat around manual pulse tests Chris Wilson
2020-02-28  8:23 ` [Intel-gfx] [PATCH 13/24] drm/i915/gt: Reset queue_priority_hint after wedging Chris Wilson
2020-02-28  8:23 ` [Intel-gfx] [PATCH 14/24] drm/i915/gt: Pull marking vm as closed underneath the vm->mutex Chris Wilson
2020-02-28  8:23 ` [Intel-gfx] [PATCH 15/24] drm/i915: Protect i915_request_await_start from early waits Chris Wilson
2020-02-28  8:23 ` [Intel-gfx] [PATCH 16/24] drm/i915/selftests: Verify LRC isolation Chris Wilson
2020-02-28  8:23 ` [Intel-gfx] [PATCH 17/24] drm/i915/selftests: Check recovery from corrupted LRC Chris Wilson
2020-02-28  8:23 ` [Intel-gfx] [PATCH 18/24] drm/i915/selftests: Wait for the kernel context switch Chris Wilson
2020-02-28 15:09   ` Mika Kuoppala
2020-02-28 15:14     ` Chris Wilson
2020-02-28  8:23 ` [Intel-gfx] [PATCH 19/24] drm/i915/selftests: Be a little more lenient for reset workers Chris Wilson
2020-02-28 15:38   ` Mika Kuoppala
2020-02-28  8:23 ` [Intel-gfx] [PATCH 20/24] drm/i915/selftests: Add request throughput measurement to perf Chris Wilson
2020-02-28  8:23 ` Chris Wilson [this message]
2020-02-28  8:23 ` [Intel-gfx] [PATCH 22/24] drm/i915/gt: Yield the timeslice if caught waiting on a user semaphore Chris Wilson
2020-02-28  8:23 ` [Intel-gfx] [PATCH 23/24] drm/i915/execlists: Check the sentinel is alone in the ELSP Chris Wilson
2020-02-28  8:23 ` [Intel-gfx] [PATCH 24/24] drm/i915/execlists: Reduce preempt-to-busy roundtrip delay Chris Wilson
2020-02-28  8:34 ` [Intel-gfx] ✗ Fi.CI.CHECKPATCH: warning for series starting with [01/24] drm/i915/gt: Check engine-is-awake on reset later Patchwork
2020-02-28  8:55 ` [Intel-gfx] ✗ Fi.CI.BAT: failure " Patchwork

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