[PATCH i-g-t] tests: Add gem_spin_batch

[PATCH i-g-t] tests: Add gem_spin_batch

[Mika Kuoppala]

Add gem_spin_batch to test that the dummyload infra
is working properly. Can be also act as tool to force
a single engine to be busy for controlled period of time.

v2: plenty of igt-fu improvements (Chris)

Cc: Abdiel Janulgue <abdiel.janulgue@linux.intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Mika Kuoppala <mika.kuoppala@intel.com>
---
 tests/Makefile.sources |  1 +
 tests/gem_spin_batch.c | 80 ++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 81 insertions(+)
 create mode 100644 tests/gem_spin_batch.c

diff --git a/tests/Makefile.sources b/tests/Makefile.sources
index 6e07d93..1763b67 100644
--- a/tests/Makefile.sources
+++ b/tests/Makefile.sources
@@ -214,6 +214,7 @@ TESTS_progs = \
 	gem_unfence_active_buffers \
 	gem_unref_active_buffers \
 	gem_wait \
+	gem_spin_batch \
 	gem_workarounds \
 	gen3_mixed_blits \
 	gen3_render_linear_blits \
diff --git a/tests/gem_spin_batch.c b/tests/gem_spin_batch.c
new file mode 100644
index 0000000..9823f4c
--- /dev/null
+++ b/tests/gem_spin_batch.c
@@ -0,0 +1,80 @@
+/*
+ * Copyright © 2017 Intel Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ *
+ */
+
+#include "igt.h"
+
+static int64_t elapsed(const struct timespec *start, const struct timespec *end)
+{
+	return (end->tv_sec - start->tv_sec) * 1000000000LL +
+		(end->tv_nsec - start->tv_nsec);
+}
+
+static void basic(int fd, unsigned engine, unsigned timeout_sec)
+{
+	const int64_t timeout_100ms = 100000000LL;
+	struct timespec s, e;
+	igt_spin_t *spin;
+	unsigned long loops = 0;
+
+	clock_gettime(CLOCK_MONOTONIC, &s);
+	igt_until_timeout(timeout_sec) {
+		spin = igt_spin_batch_new(fd, engine, 0);
+		igt_spin_batch_set_timeout(spin, timeout_100ms);
+		gem_sync(fd, spin->handle);
+		loops++;
+		igt_spin_batch_free(fd, spin);
+	}
+	clock_gettime(CLOCK_MONOTONIC, &e);
+
+	igt_assert_lte(loops * timeout_100ms, elapsed(&s, &e));
+	igt_assert_lte(elapsed(&s, &e), 105 * loops * timeout_100ms / 100); /* 5% */
+	igt_assert_eq(intel_detect_and_clear_missed_interrupts(fd), 0);
+}
+
+igt_main
+{
+	const struct intel_execution_engine *e;
+	int fd = -1;
+
+	igt_skip_on_simulation();
+
+	igt_fixture {
+		fd = drm_open_driver(DRIVER_INTEL);
+		igt_require_gem(fd);
+		igt_fork_hang_detector(fd);
+	}
+
+	for (e = intel_execution_engines; e->name; e++) {
+		if (e->exec_id == 0)
+			continue;
+
+		igt_subtest_f("basic-%s", e->name)
+			basic(fd, e->exec_id, 3);
+	}
+
+	igt_fixture {
+		igt_stop_hang_detector();
+		close(fd);
+	}
+}
-- 
2.7.4

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Re: [PATCH i-g-t] tests: Add gem_spin_batch

[Chris Wilson]

On Tue, Mar 07, 2017 at 06:02:29PM +0200, Mika Kuoppala wrote:
> Add gem_spin_batch to test that the dummyload infra
> is working properly. Can be also act as tool to force
> a single engine to be busy for controlled period of time.
> 
> v2: plenty of igt-fu improvements (Chris)
> 
> Cc: Abdiel Janulgue <abdiel.janulgue@linux.intel.com>
> Cc: Chris Wilson <chris@chris-wilson.co.uk>
> Signed-off-by: Mika Kuoppala <mika.kuoppala@intel.com>
> ---
>  tests/Makefile.sources |  1 +
>  tests/gem_spin_batch.c | 80 ++++++++++++++++++++++++++++++++++++++++++++++++++
>  2 files changed, 81 insertions(+)
>  create mode 100644 tests/gem_spin_batch.c
> 
> diff --git a/tests/Makefile.sources b/tests/Makefile.sources
> index 6e07d93..1763b67 100644
> --- a/tests/Makefile.sources
> +++ b/tests/Makefile.sources
> @@ -214,6 +214,7 @@ TESTS_progs = \
>  	gem_unfence_active_buffers \
>  	gem_unref_active_buffers \
>  	gem_wait \
> +	gem_spin_batch \
>  	gem_workarounds \
>  	gen3_mixed_blits \
>  	gen3_render_linear_blits \
> diff --git a/tests/gem_spin_batch.c b/tests/gem_spin_batch.c
> new file mode 100644
> index 0000000..9823f4c
> --- /dev/null
> +++ b/tests/gem_spin_batch.c
> @@ -0,0 +1,80 @@
> +/*
> + * Copyright © 2017 Intel Corporation
> + *
> + * Permission is hereby granted, free of charge, to any person obtaining a
> + * copy of this software and associated documentation files (the "Software"),
> + * to deal in the Software without restriction, including without limitation
> + * the rights to use, copy, modify, merge, publish, distribute, sublicense,
> + * and/or sell copies of the Software, and to permit persons to whom the
> + * Software is furnished to do so, subject to the following conditions:
> + *
> + * The above copyright notice and this permission notice (including the next
> + * paragraph) shall be included in all copies or substantial portions of the
> + * Software.
> + *
> + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
> + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
> + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
> + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
> + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
> + * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
> + * IN THE SOFTWARE.
> + *
> + */
> +
> +#include "igt.h"
> +

static void basic(int fd, unsigned engine, unsigned timeout_sec)
{
	const int64_t timeout_100ms = 100000000LL;
	unsigned long loops = 0;
	igt_spin_t *spin;
	struct timespec tv = {};
	int64_t elapsed;

	spin = igt_spin_batch_new(fd, engine, 0);
	while ((elapsed = igt_nanoseconds_elapsed(&tv)) >> 30 < timeout_sec) {
		igt_spin_t *next = igt_spin_bach_new(fd, engine, 0);

		igt_spin_batch_set_timeout(spin, timeout_100ms);
		gem_sync(fd, spin->handle);
		loops++;

		igt_spin_batch_free(fd, spin);
		spin = next;
	}
	igt_spin_batch_free(fd, spin);

	igt_assert_lte(loops * timeout_100ms, elapsed);
	igt_assert_lte(100 * elapsed < 105 * loops * timeout_100ms);

	igt_assert_eq(intel_detect_and_clear_missed_interrupts(fd), 0);
}

-- 
Chris Wilson, Intel Open Source Technology Centre
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[PATCH i-g-t] tests: Add gem_spin_batch

[Mika Kuoppala]

Add gem_spin_batch to test that the dummyload infra
is working properly. Can be also act as tool to force
a single engine to be busy for controlled period of time.

v2: plenty of igt-fu improvements (Chris)
v3: nesting batches for more utilization, epsilon fun (Chris)

Cc: Abdiel Janulgue <abdiel.janulgue@linux.intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Mika Kuoppala <mika.kuoppala@intel.com>
---
 tests/Makefile.sources |  1 +
 tests/gem_spin_batch.c | 85 ++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 86 insertions(+)
 create mode 100644 tests/gem_spin_batch.c

diff --git a/tests/Makefile.sources b/tests/Makefile.sources
index 6e07d93..1763b67 100644
--- a/tests/Makefile.sources
+++ b/tests/Makefile.sources
@@ -214,6 +214,7 @@ TESTS_progs = \
 	gem_unfence_active_buffers \
 	gem_unref_active_buffers \
 	gem_wait \
+	gem_spin_batch \
 	gem_workarounds \
 	gen3_mixed_blits \
 	gen3_render_linear_blits \
diff --git a/tests/gem_spin_batch.c b/tests/gem_spin_batch.c
new file mode 100644
index 0000000..a408fe1
--- /dev/null
+++ b/tests/gem_spin_batch.c
@@ -0,0 +1,85 @@
+/*
+ * Copyright © 2017 Intel Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ *
+ */
+
+#include "igt.h"
+
+#define MAX_ERROR 3 /* % */
+
+#define assert_within_epsilon(x, ref, tolerance) \
+	igt_assert_f(100 * x <= (100 + tolerance) * ref && \
+		     100 * x >= (100 - tolerance) * ref, \
+		     "'%s' != '%s' (%ld not within %d%% tolerance of %ld)\n", \
+		     #x, #ref, (int64_t)x, tolerance, (int64_t)ref)
+
+static void basic(int fd, unsigned int engine, unsigned int timeout_sec)
+{
+	const uint64_t timeout_100ms = 100000000LL;
+	unsigned long loops = 0;
+	igt_spin_t *spin;
+	struct timespec tv = { };
+	uint64_t elapsed;
+
+	spin = igt_spin_batch_new(fd, engine, 0);
+	while ((elapsed = igt_nsec_elapsed(&tv)) >> 30 < timeout_sec) {
+		igt_spin_t *next = igt_spin_batch_new(fd, engine, 0);
+
+		igt_spin_batch_set_timeout(spin, timeout_100ms);
+		gem_sync(fd, spin->handle);
+		loops++;
+
+		igt_spin_batch_free(fd, spin);
+		spin = next;
+	}
+	igt_spin_batch_free(fd, spin);
+
+	assert_within_epsilon(timeout_100ms * loops, elapsed, MAX_ERROR);
+	igt_assert_eq(intel_detect_and_clear_missed_interrupts(fd), 0);
+}
+
+igt_main
+{
+	const struct intel_execution_engine *e;
+	int fd = -1;
+
+	igt_skip_on_simulation();
+
+	igt_fixture {
+		fd = drm_open_driver(DRIVER_INTEL);
+		igt_require_gem(fd);
+		igt_fork_hang_detector(fd);
+	}
+
+	for (e = intel_execution_engines; e->name; e++) {
+		if (e->exec_id == 0)
+			continue;
+
+		igt_subtest_f("basic-%s", e->name)
+			basic(fd, e->exec_id, 3);
+	}
+
+	igt_fixture {
+		igt_stop_hang_detector();
+		close(fd);
+	}
+}
-- 
2.7.4

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Re: [PATCH i-g-t] tests: Add gem_spin_batch

[Chris Wilson]

On Wed, Mar 08, 2017 at 12:44:06PM +0200, Mika Kuoppala wrote:
> Add gem_spin_batch to test that the dummyload infra
> is working properly. Can be also act as tool to force
> a single engine to be busy for controlled period of time.
> 
> v2: plenty of igt-fu improvements (Chris)
> v3: nesting batches for more utilization, epsilon fun (Chris)
> 
> Cc: Abdiel Janulgue <abdiel.janulgue@linux.intel.com>
> Cc: Chris Wilson <chris@chris-wilson.co.uk>
> Signed-off-by: Mika Kuoppala <mika.kuoppala@intel.com>
> ---
>  tests/Makefile.sources |  1 +
>  tests/gem_spin_batch.c | 85 ++++++++++++++++++++++++++++++++++++++++++++++++++
>  2 files changed, 86 insertions(+)
>  create mode 100644 tests/gem_spin_batch.c
> 
> diff --git a/tests/Makefile.sources b/tests/Makefile.sources
> index 6e07d93..1763b67 100644
> --- a/tests/Makefile.sources
> +++ b/tests/Makefile.sources
> @@ -214,6 +214,7 @@ TESTS_progs = \
>  	gem_unfence_active_buffers \
>  	gem_unref_active_buffers \
>  	gem_wait \
> +	gem_spin_batch \
>  	gem_workarounds \
>  	gen3_mixed_blits \
>  	gen3_render_linear_blits \
> diff --git a/tests/gem_spin_batch.c b/tests/gem_spin_batch.c
> new file mode 100644
> index 0000000..a408fe1
> --- /dev/null
> +++ b/tests/gem_spin_batch.c
> @@ -0,0 +1,85 @@
> +/*
> + * Copyright © 2017 Intel Corporation
> + *
> + * Permission is hereby granted, free of charge, to any person obtaining a
> + * copy of this software and associated documentation files (the "Software"),
> + * to deal in the Software without restriction, including without limitation
> + * the rights to use, copy, modify, merge, publish, distribute, sublicense,
> + * and/or sell copies of the Software, and to permit persons to whom the
> + * Software is furnished to do so, subject to the following conditions:
> + *
> + * The above copyright notice and this permission notice (including the next
> + * paragraph) shall be included in all copies or substantial portions of the
> + * Software.
> + *
> + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
> + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
> + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
> + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
> + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
> + * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
> + * IN THE SOFTWARE.
> + *
> + */
> +
> +#include "igt.h"
> +
> +#define MAX_ERROR 3 /* % */
> +
> +#define assert_within_epsilon(x, ref, tolerance) \
> +	igt_assert_f(100 * x <= (100 + tolerance) * ref && \
> +		     100 * x >= (100 - tolerance) * ref, \
> +		     "'%s' != '%s' (%ld not within %d%% tolerance of %ld)\n", \
> +		     #x, #ref, (int64_t)x, tolerance, (int64_t)ref)
> +
> +static void basic(int fd, unsigned int engine, unsigned int timeout_sec)
> +{
> +	const uint64_t timeout_100ms = 100000000LL;
> +	unsigned long loops = 0;
> +	igt_spin_t *spin;
> +	struct timespec tv = { };
> +	uint64_t elapsed;
> +
> +	spin = igt_spin_batch_new(fd, engine, 0);
> +	while ((elapsed = igt_nsec_elapsed(&tv)) >> 30 < timeout_sec) {
> +		igt_spin_t *next = igt_spin_batch_new(fd, engine, 0);
> +
> +		igt_spin_batch_set_timeout(spin, timeout_100ms);
> +		gem_sync(fd, spin->handle);
> +		loops++;
> +
> +		igt_spin_batch_free(fd, spin);
> +		spin = next;
> +	}
> +	igt_spin_batch_free(fd, spin);
> +
> +	assert_within_epsilon(timeout_100ms * loops, elapsed, MAX_ERROR);
> +	igt_assert_eq(intel_detect_and_clear_missed_interrupts(fd), 0);
> +}
> +
> +igt_main
> +{
> +	const struct intel_execution_engine *e;
> +	int fd = -1;
> +
> +	igt_skip_on_simulation();
> +
> +	igt_fixture {
> +		fd = drm_open_driver(DRIVER_INTEL);
> +		igt_require_gem(fd);
> +		igt_fork_hang_detector(fd);

intel_detect_and_clear_missed_interrupts(fd);

And I'm done! :)
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
-Chris

-- 
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Re: [PATCH i-g-t] tests: Add gem_spin_batch

[Mika Kuoppala]

Chris Wilson <chris@chris-wilson.co.uk> writes:

> On Wed, Mar 08, 2017 at 12:44:06PM +0200, Mika Kuoppala wrote:
>> Add gem_spin_batch to test that the dummyload infra
>> is working properly. Can be also act as tool to force
>> a single engine to be busy for controlled period of time.
>> 
>> v2: plenty of igt-fu improvements (Chris)
>> v3: nesting batches for more utilization, epsilon fun (Chris)
>> 
>> Cc: Abdiel Janulgue <abdiel.janulgue@linux.intel.com>
>> Cc: Chris Wilson <chris@chris-wilson.co.uk>
>> Signed-off-by: Mika Kuoppala <mika.kuoppala@intel.com>
>> ---
>>  tests/Makefile.sources |  1 +
>>  tests/gem_spin_batch.c | 85 ++++++++++++++++++++++++++++++++++++++++++++++++++
>>  2 files changed, 86 insertions(+)
>>  create mode 100644 tests/gem_spin_batch.c
>> 
>> diff --git a/tests/Makefile.sources b/tests/Makefile.sources
>> index 6e07d93..1763b67 100644
>> --- a/tests/Makefile.sources
>> +++ b/tests/Makefile.sources
>> @@ -214,6 +214,7 @@ TESTS_progs = \
>>  	gem_unfence_active_buffers \
>>  	gem_unref_active_buffers \
>>  	gem_wait \
>> +	gem_spin_batch \
>>  	gem_workarounds \
>>  	gen3_mixed_blits \
>>  	gen3_render_linear_blits \
>> diff --git a/tests/gem_spin_batch.c b/tests/gem_spin_batch.c
>> new file mode 100644
>> index 0000000..a408fe1
>> --- /dev/null
>> +++ b/tests/gem_spin_batch.c
>> @@ -0,0 +1,85 @@
>> +/*
>> + * Copyright © 2017 Intel Corporation
>> + *
>> + * Permission is hereby granted, free of charge, to any person obtaining a
>> + * copy of this software and associated documentation files (the "Software"),
>> + * to deal in the Software without restriction, including without limitation
>> + * the rights to use, copy, modify, merge, publish, distribute, sublicense,
>> + * and/or sell copies of the Software, and to permit persons to whom the
>> + * Software is furnished to do so, subject to the following conditions:
>> + *
>> + * The above copyright notice and this permission notice (including the next
>> + * paragraph) shall be included in all copies or substantial portions of the
>> + * Software.
>> + *
>> + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
>> + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
>> + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
>> + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
>> + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
>> + * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
>> + * IN THE SOFTWARE.
>> + *
>> + */
>> +
>> +#include "igt.h"
>> +
>> +#define MAX_ERROR 3 /* % */
>> +
>> +#define assert_within_epsilon(x, ref, tolerance) \
>> +	igt_assert_f(100 * x <= (100 + tolerance) * ref && \
>> +		     100 * x >= (100 - tolerance) * ref, \
>> +		     "'%s' != '%s' (%ld not within %d%% tolerance of %ld)\n", \
>> +		     #x, #ref, (int64_t)x, tolerance, (int64_t)ref)
>> +
>> +static void basic(int fd, unsigned int engine, unsigned int timeout_sec)
>> +{
>> +	const uint64_t timeout_100ms = 100000000LL;
>> +	unsigned long loops = 0;
>> +	igt_spin_t *spin;
>> +	struct timespec tv = { };
>> +	uint64_t elapsed;
>> +
>> +	spin = igt_spin_batch_new(fd, engine, 0);
>> +	while ((elapsed = igt_nsec_elapsed(&tv)) >> 30 < timeout_sec) {
>> +		igt_spin_t *next = igt_spin_batch_new(fd, engine, 0);
>> +
>> +		igt_spin_batch_set_timeout(spin, timeout_100ms);
>> +		gem_sync(fd, spin->handle);
>> +		loops++;
>> +
>> +		igt_spin_batch_free(fd, spin);
>> +		spin = next;
>> +	}
>> +	igt_spin_batch_free(fd, spin);
>> +
>> +	assert_within_epsilon(timeout_100ms * loops, elapsed, MAX_ERROR);
>> +	igt_assert_eq(intel_detect_and_clear_missed_interrupts(fd), 0);
>> +}
>> +
>> +igt_main
>> +{
>> +	const struct intel_execution_engine *e;
>> +	int fd = -1;
>> +
>> +	igt_skip_on_simulation();
>> +
>> +	igt_fixture {
>> +		fd = drm_open_driver(DRIVER_INTEL);
>> +		igt_require_gem(fd);
>> +		igt_fork_hang_detector(fd);
>
> intel_detect_and_clear_missed_interrupts(fd);
>
> And I'm done! :)
> Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>

Pushed with the intr check. Thanks for review.
-Mika


> -Chris
>
> -- 
> Chris Wilson, Intel Open Source Technology Centre
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