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From: Chris Wilson <chris@chris-wilson.co.uk>
To: intel-gfx@lists.freedesktop.org
Subject: [PATCH 11/11] drm/i915/gem: Honour O_NONBLOCK before throttling execbuf submissions
Date: Thu, 24 Oct 2019 12:40:28 +0100	[thread overview]
Message-ID: <20191024114028.6170-12-chris@chris-wilson.co.uk> (raw)
In-Reply-To: <20191024114028.6170-1-chris@chris-wilson.co.uk>

Check the user's flags on the struct file before deciding whether or not
to stall before submitting a request. This allows us to reasonably
cheaply honour O_NONBLOCK without checking at more critical phases
during request submission.

Suggested-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
---
 .../gpu/drm/i915/gem/i915_gem_execbuffer.c    | 21 ++++++++++++-------
 1 file changed, 14 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
index e4f5c269150a..c88948e4094b 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
@@ -2193,15 +2193,22 @@ static int __eb_pin_engine(struct i915_execbuffer *eb, struct intel_context *ce)
 	intel_context_timeline_unlock(tl);
 
 	if (rq) {
-		if (i915_request_wait(rq,
-				      I915_WAIT_INTERRUPTIBLE,
-				      MAX_SCHEDULE_TIMEOUT) < 0) {
-			i915_request_put(rq);
-			err = -EINTR;
-			goto err_exit;
-		}
+		bool nonblock = eb->file->filp->f_flags & O_NONBLOCK;
+		long timeout;
+
+		timeout = MAX_SCHEDULE_TIMEOUT;
+		if (nonblock)
+			timeout = 0;
 
+		timeout = i915_request_wait(rq,
+					    I915_WAIT_INTERRUPTIBLE,
+					    timeout);
 		i915_request_put(rq);
+
+		if (timeout < 0) {
+			err = nonblock ? -EWOULDBLOCK : timeout;
+			goto err_exit;
+		}
 	}
 
 	eb->engine = ce->engine;
-- 
2.24.0.rc0

_______________________________________________
Intel-gfx mailing list
Intel-gfx@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/intel-gfx

WARNING: multiple messages have this Message-ID (diff)
From: Chris Wilson <chris@chris-wilson.co.uk>
To: intel-gfx@lists.freedesktop.org
Subject: [Intel-gfx] [PATCH 11/11] drm/i915/gem: Honour O_NONBLOCK before throttling execbuf submissions
Date: Thu, 24 Oct 2019 12:40:28 +0100	[thread overview]
Message-ID: <20191024114028.6170-12-chris@chris-wilson.co.uk> (raw)
Message-ID: <20191024114028.8euTaM-rcgOLb4ZKjShuDAsTtd3t0mhTt31vpS5JZ9w@z> (raw)
In-Reply-To: <20191024114028.6170-1-chris@chris-wilson.co.uk>

Check the user's flags on the struct file before deciding whether or not
to stall before submitting a request. This allows us to reasonably
cheaply honour O_NONBLOCK without checking at more critical phases
during request submission.

Suggested-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
---
 .../gpu/drm/i915/gem/i915_gem_execbuffer.c    | 21 ++++++++++++-------
 1 file changed, 14 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
index e4f5c269150a..c88948e4094b 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
@@ -2193,15 +2193,22 @@ static int __eb_pin_engine(struct i915_execbuffer *eb, struct intel_context *ce)
 	intel_context_timeline_unlock(tl);
 
 	if (rq) {
-		if (i915_request_wait(rq,
-				      I915_WAIT_INTERRUPTIBLE,
-				      MAX_SCHEDULE_TIMEOUT) < 0) {
-			i915_request_put(rq);
-			err = -EINTR;
-			goto err_exit;
-		}
+		bool nonblock = eb->file->filp->f_flags & O_NONBLOCK;
+		long timeout;
+
+		timeout = MAX_SCHEDULE_TIMEOUT;
+		if (nonblock)
+			timeout = 0;
 
+		timeout = i915_request_wait(rq,
+					    I915_WAIT_INTERRUPTIBLE,
+					    timeout);
 		i915_request_put(rq);
+
+		if (timeout < 0) {
+			err = nonblock ? -EWOULDBLOCK : timeout;
+			goto err_exit;
+		}
 	}
 
 	eb->engine = ce->engine;
-- 
2.24.0.rc0

_______________________________________________
Intel-gfx mailing list
Intel-gfx@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/intel-gfx

  parent reply	other threads:[~2019-10-24 11:40 UTC|newest]

Thread overview: 40+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-10-24 11:40 CI testing of persistence and sysfs Chris Wilson
2019-10-24 11:40 ` [Intel-gfx] " Chris Wilson
2019-10-24 11:40 ` [PATCH 01/11] drm/i915/gem: Make context persistence optional Chris Wilson
2019-10-24 11:40   ` [Intel-gfx] " Chris Wilson
2019-10-25  9:10   ` Joonas Lahtinen
2019-10-25  9:10     ` [Intel-gfx] " Joonas Lahtinen
2019-10-25 18:22   ` Jason Ekstrand
2019-10-25 18:22     ` [Intel-gfx] " Jason Ekstrand
2019-10-25 21:29     ` Chris Wilson
2019-10-25 21:29       ` [Intel-gfx] " Chris Wilson
2019-10-29 16:19       ` Jason Ekstrand
2019-10-29 16:19         ` [Intel-gfx] " Jason Ekstrand
2019-10-29 18:02         ` Chris Wilson
2019-10-29 18:02           ` [Intel-gfx] " Chris Wilson
2019-10-24 11:40 ` [PATCH 02/11] drm/i915: Put future HW and their uAPIs under STAGING & BROKEN Chris Wilson
2019-10-24 11:40   ` [Intel-gfx] " Chris Wilson
2019-10-24 23:25   ` David Airlie
2019-10-24 23:25     ` [Intel-gfx] " David Airlie
2019-10-24 23:35   ` Rodrigo Vivi
2019-10-24 23:35     ` [Intel-gfx] " Rodrigo Vivi
2019-10-25  7:09   ` Jani Nikula
2019-10-25  7:09     ` [Intel-gfx] " Jani Nikula
2019-10-24 11:40 ` [PATCH 03/11] drm/i915/gt: Expose engine properties via sysfs Chris Wilson
2019-10-24 11:40   ` [Intel-gfx] " Chris Wilson
2019-10-24 11:40 ` [PATCH 04/11] drm/i915/gt: Expose engine->mmio_base " Chris Wilson
2019-10-24 11:40   ` [Intel-gfx] " Chris Wilson
2019-10-24 11:40 ` [PATCH 05/11] drm/i915/gt: Expose timeslice duration to sysfs Chris Wilson
2019-10-24 11:40   ` [Intel-gfx] " Chris Wilson
2019-10-24 11:40 ` [PATCH 06/11] drm/i915/gt: Expose reset stop timeout via sysfs Chris Wilson
2019-10-24 11:40   ` [Intel-gfx] " Chris Wilson
2019-10-24 11:40 ` [PATCH 07/11] drm/i915/gt: Expose preempt reset " Chris Wilson
2019-10-24 11:40   ` [Intel-gfx] " Chris Wilson
2019-10-24 11:40 ` [PATCH 08/11] drm/i915/gt: Expose heartbeat interval " Chris Wilson
2019-10-24 11:40   ` [Intel-gfx] " Chris Wilson
2019-10-24 11:40 ` [PATCH 09/11] drm/i915: Flush idle barriers when waiting Chris Wilson
2019-10-24 11:40   ` [Intel-gfx] " Chris Wilson
2019-10-24 11:40 ` [PATCH 10/11] drm/i915: Allow userspace to specify ringsize on construction Chris Wilson
2019-10-24 11:40   ` [Intel-gfx] " Chris Wilson
2019-10-24 11:40 ` Chris Wilson [this message]
2019-10-24 11:40   ` [Intel-gfx] [PATCH 11/11] drm/i915/gem: Honour O_NONBLOCK before throttling execbuf submissions Chris Wilson

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