[PATCH] drm/i915/selftests: Smoketest preemption

[PATCH] drm/i915/selftests: Smoketest preemption

[Chris Wilson]

Very light stress test to bombard the submission backends with a large
stream with requests of randomly assigned priorities. Preemption will be
occasionally requested, but never succeed!

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Michał Winiarski <michal.winiarski@intel.com>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
---
 drivers/gpu/drm/i915/selftests/intel_lrc.c | 83 ++++++++++++++++++++++
 1 file changed, 83 insertions(+)

diff --git a/drivers/gpu/drm/i915/selftests/intel_lrc.c b/drivers/gpu/drm/i915/selftests/intel_lrc.c
index 1aea7a8f2224..8c8e6a8f7d52 100644
--- a/drivers/gpu/drm/i915/selftests/intel_lrc.c
+++ b/drivers/gpu/drm/i915/selftests/intel_lrc.c
@@ -6,6 +6,7 @@
 
 #include "../i915_selftest.h"
 #include "igt_flush_test.h"
+#include "i915_random.h"
 
 #include "mock_context.h"
 
@@ -573,6 +574,87 @@ static int live_preempt_hang(void *arg)
 	return err;
 }
 
+static int random_range(struct rnd_state *rnd, int min, int max)
+{
+	return i915_prandom_u32_max_state(max - min, rnd) + min;
+}
+
+static int random_priority(struct rnd_state *rnd)
+{
+	return random_range(rnd, I915_PRIORITY_MIN, I915_PRIORITY_MAX);
+}
+
+static int live_preempt_smoke(void *arg)
+{
+#define NCTX 1024
+	struct drm_i915_private *i915 = arg;
+	struct i915_gem_context **contexts;
+	struct intel_engine_cs *engine;
+	enum intel_engine_id id;
+	IGT_TIMEOUT(end_time);
+	I915_RND_STATE(prng);
+	unsigned long count;
+	int err = -ENOMEM;
+	int n;
+
+	if (!HAS_LOGICAL_RING_PREEMPTION(i915))
+		return 0;
+
+	contexts = kmalloc_array(NCTX, sizeof(*contexts), GFP_KERNEL);
+	if (!contexts)
+		return -ENOMEM;
+
+	mutex_lock(&i915->drm.struct_mutex);
+	intel_runtime_pm_get(i915);
+
+	for (n = 0; n < NCTX; n++) {
+		contexts[n] = kernel_context(i915);
+		if (!contexts[n])
+			goto err_ctx;
+	}
+
+	count = 0;
+	do {
+		for_each_engine(engine, i915, id) {
+			struct i915_gem_context *ctx =
+				contexts[i915_prandom_u32_max_state(NCTX,
+								    &prng)];
+			struct i915_request *rq;
+
+			ctx->sched.priority = random_priority(&prng);
+
+			rq = i915_request_alloc(engine,  ctx);
+			if (IS_ERR(rq)) {
+				err = PTR_ERR(rq);
+				goto err_ctx;
+			}
+
+			i915_request_add(rq);
+			count++;
+		}
+	} while (!__igt_timeout(end_time, NULL));
+
+	pr_info("Submitted %lu requests across %d engines and %d contexts\n",
+		count, INTEL_INFO(i915)->num_rings, NCTX);
+
+	err = 0;
+err_ctx:
+	if (igt_flush_test(i915, I915_WAIT_LOCKED))
+		err = -EIO;
+
+	for (n = 0; n < NCTX; n++) {
+		if (!contexts[n])
+			break;
+		kernel_context_close(contexts[n]);
+	}
+
+	intel_runtime_pm_put(i915);
+	mutex_unlock(&i915->drm.struct_mutex);
+	kfree(contexts);
+	return err;
+#undef NCTX
+}
+
 int intel_execlists_live_selftests(struct drm_i915_private *i915)
 {
 	static const struct i915_subtest tests[] = {
@@ -580,6 +662,7 @@ int intel_execlists_live_selftests(struct drm_i915_private *i915)
 		SUBTEST(live_preempt),
 		SUBTEST(live_late_preempt),
 		SUBTEST(live_preempt_hang),
+		SUBTEST(live_preempt_smoke),
 	};
 
 	if (!HAS_EXECLISTS(i915))
-- 
2.19.0

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✗ Fi.CI.CHECKPATCH: warning for drm/i915/selftests: Smoketest preemption

[Patchwork]

== Series Details ==

Series: drm/i915/selftests: Smoketest preemption
URL   : https://patchwork.freedesktop.org/series/50002/
State : warning

== Summary ==

$ dim checkpatch origin/drm-tip
9badaef7a3f0 drm/i915/selftests: Smoketest preemption
-:50: WARNING:LINE_SPACING: Missing a blank line after declarations
#50: FILE: drivers/gpu/drm/i915/selftests/intel_lrc.c:594:
+	enum intel_engine_id id;
+	IGT_TIMEOUT(end_time);

total: 0 errors, 1 warnings, 0 checks, 101 lines checked

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✗ Fi.CI.SPARSE: warning for drm/i915/selftests: Smoketest preemption

[Patchwork]

== Series Details ==

Series: drm/i915/selftests: Smoketest preemption
URL   : https://patchwork.freedesktop.org/series/50002/
State : warning

== Summary ==

$ dim sparse origin/drm-tip
Commit: drm/i915/selftests: Smoketest preemption
+./include/linux/slab.h:631:13: error: undefined identifier '__builtin_mul_overflow'
+./include/linux/slab.h:631:13: warning: call with no type!

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✓ Fi.CI.BAT: success for drm/i915/selftests: Smoketest preemption

[Patchwork]

== Series Details ==

Series: drm/i915/selftests: Smoketest preemption
URL   : https://patchwork.freedesktop.org/series/50002/
State : success

== Summary ==

= CI Bug Log - changes from CI_DRM_4859 -> Patchwork_10247 =

== Summary - WARNING ==

  Minor unknown changes coming with Patchwork_10247 need to be verified
  manually.
  
  If you think the reported changes have nothing to do with the changes
  introduced in Patchwork_10247, please notify your bug team to allow them
  to document this new failure mode, which will reduce false positives in CI.

  External URL: https://patchwork.freedesktop.org/api/1.0/series/50002/revisions/1/mbox/

== Possible new issues ==

  Here are the unknown changes that may have been introduced in Patchwork_10247:

  === IGT changes ===

    ==== Warnings ====

    igt@pm_rpm@module-reload:
      fi-hsw-4770r:       PASS -> SKIP

    
== Known issues ==

  Here are the changes found in Patchwork_10247 that come from known issues:

  === IGT changes ===

    ==== Issues hit ====

    igt@drv_module_reload@basic-reload-inject:
      fi-hsw-4770r:       PASS -> DMESG-WARN (fdo#107425, fdo#107924)

    igt@gem_exec_suspend@basic-s3:
      fi-bdw-samus:       PASS -> INCOMPLETE (fdo#107773)

    igt@kms_pipe_crc_basic@suspend-read-crc-pipe-a:
      fi-byt-clapper:     PASS -> FAIL (fdo#103191, fdo#107362)

    igt@kms_pipe_crc_basic@suspend-read-crc-pipe-b:
      fi-snb-2520m:       PASS -> DMESG-FAIL (fdo#103713)

    igt@kms_setmode@basic-clone-single-crtc:
      fi-snb-2520m:       PASS -> DMESG-WARN (fdo#103713)

    igt@pm_rpm@basic-pci-d3-state:
      fi-glk-j4005:       PASS -> DMESG-WARN (fdo#106097)

    
    ==== Possible fixes ====

    igt@drv_selftest@live_hangcheck:
      fi-glk-j4005:       INCOMPLETE (k.org#198133, fdo#103359) -> PASS

    igt@kms_pipe_crc_basic@nonblocking-crc-pipe-b:
      fi-byt-clapper:     FAIL (fdo#107362) -> PASS

    igt@kms_pipe_crc_basic@suspend-read-crc-pipe-c:
      fi-cfl-8109u:       FAIL (fdo#103375) -> PASS

    
  fdo#103191 https://bugs.freedesktop.org/show_bug.cgi?id=103191
  fdo#103359 https://bugs.freedesktop.org/show_bug.cgi?id=103359
  fdo#103375 https://bugs.freedesktop.org/show_bug.cgi?id=103375
  fdo#103713 https://bugs.freedesktop.org/show_bug.cgi?id=103713
  fdo#106097 https://bugs.freedesktop.org/show_bug.cgi?id=106097
  fdo#107362 https://bugs.freedesktop.org/show_bug.cgi?id=107362
  fdo#107425 https://bugs.freedesktop.org/show_bug.cgi?id=107425
  fdo#107773 https://bugs.freedesktop.org/show_bug.cgi?id=107773
  fdo#107924 https://bugs.freedesktop.org/show_bug.cgi?id=107924
  k.org#198133 https://bugzilla.kernel.org/show_bug.cgi?id=198133


== Participating hosts (51 -> 46) ==

  Missing    (5): fi-ctg-p8600 fi-ilk-m540 fi-byt-squawks fi-bsw-cyan fi-hsw-4200u 


== Build changes ==

    * Linux: CI_DRM_4859 -> Patchwork_10247

  CI_DRM_4859: 841654aee134e50b21bf8f2aab17da8d0afd14c4 @ git://anongit.freedesktop.org/gfx-ci/linux
  IGT_4648: f2919ea120660ca15622a27527e1842d0dd3f1b7 @ git://anongit.freedesktop.org/xorg/app/intel-gpu-tools
  Patchwork_10247: 9badaef7a3f0ec63d986395a4619c363957bfb5e @ git://anongit.freedesktop.org/gfx-ci/linux


== Linux commits ==

9badaef7a3f0 drm/i915/selftests: Smoketest preemption

== Logs ==

For more details see: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_10247/issues.html
_______________________________________________
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[PATCH v2] drm/i915/selftests: Smoketest preemption

[Chris Wilson]

Very light stress test to bombard the submission backends with a large
stream with requests of randomly assigned priorities. Preemption will be
occasionally requested, but never succeed!

v2: Include a second pattern with more frequent preemption

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Michał Winiarski <michal.winiarski@intel.com>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
---
 drivers/gpu/drm/i915/selftests/intel_lrc.c | 137 +++++++++++++++++++++
 1 file changed, 137 insertions(+)

diff --git a/drivers/gpu/drm/i915/selftests/intel_lrc.c b/drivers/gpu/drm/i915/selftests/intel_lrc.c
index 1aea7a8f2224..3a474bb64c05 100644
--- a/drivers/gpu/drm/i915/selftests/intel_lrc.c
+++ b/drivers/gpu/drm/i915/selftests/intel_lrc.c
@@ -6,6 +6,7 @@
 
 #include "../i915_selftest.h"
 #include "igt_flush_test.h"
+#include "i915_random.h"
 
 #include "mock_context.h"
 
@@ -573,6 +574,141 @@ static int live_preempt_hang(void *arg)
 	return err;
 }
 
+static int random_range(struct rnd_state *rnd, int min, int max)
+{
+	return i915_prandom_u32_max_state(max - min, rnd) + min;
+}
+
+static int random_priority(struct rnd_state *rnd)
+{
+	return random_range(rnd, I915_PRIORITY_MIN, I915_PRIORITY_MAX);
+}
+
+struct preempt_smoke {
+	struct drm_i915_private *i915;
+	struct i915_gem_context **contexts;
+	unsigned int ncontext;
+	struct rnd_state prng;
+};
+
+static struct i915_gem_context *smoke_context(struct preempt_smoke *smoke)
+{
+	return smoke->contexts[i915_prandom_u32_max_state(smoke->ncontext,
+							  &smoke->prng)];
+}
+
+static int smoke_crescendo(struct preempt_smoke *smoke)
+{
+	struct intel_engine_cs *engine;
+	enum intel_engine_id id;
+	unsigned long count;
+
+	count = 0;
+	for_each_engine(engine, smoke->i915, id) {
+		IGT_TIMEOUT(end_time);
+
+		do {
+			struct i915_gem_context *ctx = smoke_context(smoke);
+			struct i915_request *rq;
+
+			ctx->sched.priority = count % I915_PRIORITY_MAX;
+
+			rq = i915_request_alloc(engine, ctx);
+			if (IS_ERR(rq))
+				return PTR_ERR(rq);
+
+			i915_request_add(rq);
+			count++;
+		} while (!__igt_timeout(end_time, NULL));
+	}
+
+	pr_info("Submitted %lu crescendo requests across %d engines and %d contexts\n",
+		count, INTEL_INFO(smoke->i915)->num_rings, smoke->ncontext);
+	return 0;
+}
+
+static int smoke_random(struct preempt_smoke *smoke)
+{
+	struct intel_engine_cs *engine;
+	enum intel_engine_id id;
+	IGT_TIMEOUT(end_time);
+	unsigned long count;
+
+	count = 0;
+	do {
+		for_each_engine(engine, smoke->i915, id) {
+			struct i915_gem_context *ctx = smoke_context(smoke);
+			struct i915_request *rq;
+
+			ctx->sched.priority = random_priority(&smoke->prng);
+
+			rq = i915_request_alloc(engine, ctx);
+			if (IS_ERR(rq))
+				return PTR_ERR(rq);
+
+			i915_request_add(rq);
+			count++;
+		}
+	} while (!__igt_timeout(end_time, NULL));
+
+	pr_info("Submitted %lu random requests across %d engines and %d contexts\n",
+		count, INTEL_INFO(smoke->i915)->num_rings, smoke->ncontext);
+	return 0;
+}
+
+static int live_preempt_smoke(void *arg)
+{
+	struct preempt_smoke smoke = {
+		.i915 = arg,
+		.prng = I915_RND_STATE_INITIALIZER(i915_selftest.random_seed),
+		.ncontext = 1024,
+	};
+	int err = -ENOMEM;
+	int n;
+
+	if (!HAS_LOGICAL_RING_PREEMPTION(smoke.i915))
+		return 0;
+
+	smoke.contexts = kmalloc_array(smoke.ncontext,
+				       sizeof(*smoke.contexts),
+				       GFP_KERNEL);
+	if (!smoke.contexts)
+		return -ENOMEM;
+
+	mutex_lock(&smoke.i915->drm.struct_mutex);
+	intel_runtime_pm_get(smoke.i915);
+
+	for (n = 0; n < smoke.ncontext; n++) {
+		smoke.contexts[n] = kernel_context(smoke.i915);
+		if (!smoke.contexts[n])
+			goto err_ctx;
+	}
+
+	err = smoke_crescendo(&smoke);
+	if (err)
+		goto err_ctx;
+
+	err = smoke_random(&smoke);
+	if (err)
+		goto err_ctx;
+
+err_ctx:
+	if (igt_flush_test(smoke.i915, I915_WAIT_LOCKED))
+		err = -EIO;
+
+	for (n = 0; n < smoke.ncontext; n++) {
+		if (!smoke.contexts[n])
+			break;
+		kernel_context_close(smoke.contexts[n]);
+	}
+
+	intel_runtime_pm_put(smoke.i915);
+	mutex_unlock(&smoke.i915->drm.struct_mutex);
+	kfree(smoke.contexts);
+
+	return err;
+}
+
 int intel_execlists_live_selftests(struct drm_i915_private *i915)
 {
 	static const struct i915_subtest tests[] = {
@@ -580,6 +716,7 @@ int intel_execlists_live_selftests(struct drm_i915_private *i915)
 		SUBTEST(live_preempt),
 		SUBTEST(live_late_preempt),
 		SUBTEST(live_preempt_hang),
+		SUBTEST(live_preempt_smoke),
 	};
 
 	if (!HAS_EXECLISTS(i915))
-- 
2.19.0

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✗ Fi.CI.CHECKPATCH: warning for drm/i915/selftests: Smoketest preemption (rev2)

[Patchwork]

== Series Details ==

Series: drm/i915/selftests: Smoketest preemption (rev2)
URL   : https://patchwork.freedesktop.org/series/50002/
State : warning

== Summary ==

$ dim checkpatch origin/drm-tip
f3a04f9d05fe drm/i915/selftests: Smoketest preemption
-:92: WARNING:LINE_SPACING: Missing a blank line after declarations
#92: FILE: drivers/gpu/drm/i915/selftests/intel_lrc.c:634:
+	enum intel_engine_id id;
+	IGT_TIMEOUT(end_time);

total: 0 errors, 1 warnings, 0 checks, 155 lines checked

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✗ Fi.CI.SPARSE: warning for drm/i915/selftests: Smoketest preemption (rev2)

[Patchwork]

== Series Details ==

Series: drm/i915/selftests: Smoketest preemption (rev2)
URL   : https://patchwork.freedesktop.org/series/50002/
State : warning

== Summary ==

$ dim sparse origin/drm-tip
Commit: drm/i915/selftests: Smoketest preemption
+./include/linux/slab.h:631:13: error: undefined identifier '__builtin_mul_overflow'
+./include/linux/slab.h:631:13: warning: call with no type!

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✗ Fi.CI.BAT: failure for drm/i915/selftests: Smoketest preemption (rev2)

[Patchwork]

== Series Details ==

Series: drm/i915/selftests: Smoketest preemption (rev2)
URL   : https://patchwork.freedesktop.org/series/50002/
State : failure

== Summary ==

= CI Bug Log - changes from CI_DRM_4859 -> Patchwork_10249 =

== Summary - FAILURE ==

  Serious unknown changes coming with Patchwork_10249 absolutely need to be
  verified manually.
  
  If you think the reported changes have nothing to do with the changes
  introduced in Patchwork_10249, please notify your bug team to allow them
  to document this new failure mode, which will reduce false positives in CI.

  External URL: https://patchwork.freedesktop.org/api/1.0/series/50002/revisions/2/mbox/

== Possible new issues ==

  Here are the unknown changes that may have been introduced in Patchwork_10249:

  === IGT changes ===

    ==== Possible regressions ====

    igt@drv_selftest@live_gtt:
      fi-kbl-7560u:       PASS -> INCOMPLETE

    
== Known issues ==

  Here are the changes found in Patchwork_10249 that come from known issues:

  === IGT changes ===

    ==== Issues hit ====

    igt@drv_getparams_basic@basic-subslice-total:
      fi-snb-2520m:       PASS -> DMESG-WARN (fdo#103713) +10

    igt@drv_module_reload@basic-reload:
      fi-blb-e6850:       PASS -> INCOMPLETE (fdo#107718)

    igt@gem_exec_suspend@basic-s3:
      fi-cfl-8109u:       PASS -> INCOMPLETE (fdo#107187)

    igt@kms_flip@basic-flip-vs-modeset:
      fi-ilk-650:         PASS -> DMESG-WARN (fdo#106387)

    igt@kms_pipe_crc_basic@suspend-read-crc-pipe-b:
      fi-byt-clapper:     PASS -> FAIL (fdo#103191, fdo#107362)

    
    ==== Possible fixes ====

    igt@drv_selftest@live_guc:
      fi-skl-guc:         DMESG-WARN (fdo#107258) -> PASS
      fi-kbl-guc:         DMESG-WARN (fdo#107258) -> PASS

    igt@drv_selftest@live_hangcheck:
      fi-glk-j4005:       INCOMPLETE (fdo#103359, k.org#198133) -> PASS

    igt@kms_pipe_crc_basic@nonblocking-crc-pipe-b:
      fi-byt-clapper:     FAIL (fdo#107362) -> PASS

    
  fdo#103191 https://bugs.freedesktop.org/show_bug.cgi?id=103191
  fdo#103359 https://bugs.freedesktop.org/show_bug.cgi?id=103359
  fdo#103713 https://bugs.freedesktop.org/show_bug.cgi?id=103713
  fdo#106387 https://bugs.freedesktop.org/show_bug.cgi?id=106387
  fdo#107187 https://bugs.freedesktop.org/show_bug.cgi?id=107187
  fdo#107258 https://bugs.freedesktop.org/show_bug.cgi?id=107258
  fdo#107362 https://bugs.freedesktop.org/show_bug.cgi?id=107362
  fdo#107718 https://bugs.freedesktop.org/show_bug.cgi?id=107718
  k.org#198133 https://bugzilla.kernel.org/show_bug.cgi?id=198133


== Participating hosts (51 -> 45) ==

  Missing    (6): fi-ilk-m540 fi-hsw-4200u fi-byt-squawks fi-bsw-cyan fi-cfl-guc fi-ctg-p8600 


== Build changes ==

    * Linux: CI_DRM_4859 -> Patchwork_10249

  CI_DRM_4859: 841654aee134e50b21bf8f2aab17da8d0afd14c4 @ git://anongit.freedesktop.org/gfx-ci/linux
  IGT_4648: f2919ea120660ca15622a27527e1842d0dd3f1b7 @ git://anongit.freedesktop.org/xorg/app/intel-gpu-tools
  Patchwork_10249: f3a04f9d05fe37ce12006ae7e3cb59ce57d03d33 @ git://anongit.freedesktop.org/gfx-ci/linux


== Linux commits ==

f3a04f9d05fe drm/i915/selftests: Smoketest preemption

== Logs ==

For more details see: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_10249/issues.html
_______________________________________________
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✓ Fi.CI.IGT: success for drm/i915/selftests: Smoketest preemption

[Patchwork]

== Series Details ==

Series: drm/i915/selftests: Smoketest preemption
URL   : https://patchwork.freedesktop.org/series/50002/
State : success

== Summary ==

= CI Bug Log - changes from CI_DRM_4859_full -> Patchwork_10247_full =

== Summary - SUCCESS ==

  No regressions found.

  

== Known issues ==

  Here are the changes found in Patchwork_10247_full that come from known issues:

  === IGT changes ===

    ==== Issues hit ====

    igt@kms_busy@extended-modeset-hang-newfb-render-c:
      shard-apl:          NOTRUN -> DMESG-WARN (fdo#107956)

    igt@kms_setmode@basic:
      shard-apl:          PASS -> FAIL (fdo#99912)

    
    ==== Possible fixes ====

    igt@gem_eio@in-flight-suspend:
      shard-apl:          INCOMPLETE (fdo#103927) -> PASS

    igt@gem_exec_big:
      shard-hsw:          TIMEOUT (fdo#107937) -> PASS

    igt@kms_flip@2x-blocking-absolute-wf_vblank-interruptible:
      shard-glk:          INCOMPLETE (k.org#198133, fdo#103359) -> PASS

    igt@kms_flip@2x-flip-vs-expired-vblank:
      shard-glk:          FAIL (fdo#105363) -> PASS +1

    igt@kms_setmode@basic:
      shard-kbl:          FAIL (fdo#99912) -> PASS

    
  fdo#103359 https://bugs.freedesktop.org/show_bug.cgi?id=103359
  fdo#103927 https://bugs.freedesktop.org/show_bug.cgi?id=103927
  fdo#105363 https://bugs.freedesktop.org/show_bug.cgi?id=105363
  fdo#107937 https://bugs.freedesktop.org/show_bug.cgi?id=107937
  fdo#107956 https://bugs.freedesktop.org/show_bug.cgi?id=107956
  fdo#99912 https://bugs.freedesktop.org/show_bug.cgi?id=99912
  k.org#198133 https://bugzilla.kernel.org/show_bug.cgi?id=198133


== Participating hosts (5 -> 5) ==

  No changes in participating hosts


== Build changes ==

    * Linux: CI_DRM_4859 -> Patchwork_10247

  CI_DRM_4859: 841654aee134e50b21bf8f2aab17da8d0afd14c4 @ git://anongit.freedesktop.org/gfx-ci/linux
  IGT_4648: f2919ea120660ca15622a27527e1842d0dd3f1b7 @ git://anongit.freedesktop.org/xorg/app/intel-gpu-tools
  Patchwork_10247: 9badaef7a3f0ec63d986395a4619c363957bfb5e @ git://anongit.freedesktop.org/gfx-ci/linux
  piglit_4509: fdc5a4ca11124ab8413c7988896eec4c97336694 @ git://anongit.freedesktop.org/piglit

== Logs ==

For more details see: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_10247/shards.html
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