[PATCH 11/66] drm/i915: Add unit tests for the breadcrumb rbtree, insert/remove
Chris Wilson
chris at chris-wilson.co.uk
Tue Jan 24 21:38:58 UTC 2017
First retroactive test, make sure that the waiters are in global seqno
order after random inserts and removals.
Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
---
drivers/gpu/drm/i915/intel_breadcrumbs.c | 21 +++
drivers/gpu/drm/i915/intel_engine_cs.c | 4 +
drivers/gpu/drm/i915/intel_ringbuffer.h | 2 +
.../gpu/drm/i915/selftests/i915_mock_selftests.h | 1 +
drivers/gpu/drm/i915/selftests/intel_breadcrumbs.c | 176 +++++++++++++++++++++
drivers/gpu/drm/i915/selftests/mock_engine.c | 55 +++++++
drivers/gpu/drm/i915/selftests/mock_engine.h | 32 ++++
7 files changed, 291 insertions(+)
create mode 100644 drivers/gpu/drm/i915/selftests/intel_breadcrumbs.c
create mode 100644 drivers/gpu/drm/i915/selftests/mock_engine.c
create mode 100644 drivers/gpu/drm/i915/selftests/mock_engine.h
diff --git a/drivers/gpu/drm/i915/intel_breadcrumbs.c b/drivers/gpu/drm/i915/intel_breadcrumbs.c
index 9fd002bcebb6..1f36756f8759 100644
--- a/drivers/gpu/drm/i915/intel_breadcrumbs.c
+++ b/drivers/gpu/drm/i915/intel_breadcrumbs.c
@@ -107,6 +107,18 @@ static void __intel_breadcrumbs_enable_irq(struct intel_breadcrumbs *b)
if (b->rpm_wakelock)
return;
+ if (I915_SELFTEST_ONLY(b->mock)) {
+ /* For our mock objects we want to avoid interaction
+ * with the real hardware (which is not set up). So
+ * we simply pretend we have enabled the powerwell
+ * and the irq, and leave it up to the mock
+ * implementation to call intel_engine_wakeup()
+ * itself when it wants to simulate a user interrupt,
+ */
+ b->rpm_wakelock = true;
+ return;
+ }
+
/* Since we are waiting on a request, the GPU should be busy
* and should have its own rpm reference. For completeness,
* record an rpm reference for ourselves to cover the
@@ -142,6 +154,11 @@ static void __intel_breadcrumbs_disable_irq(struct intel_breadcrumbs *b)
if (!b->rpm_wakelock)
return;
+ if (I915_SELFTEST_ONLY(b->mock)) {
+ b->rpm_wakelock = false;
+ return;
+ }
+
if (b->irq_enabled) {
irq_disable(engine);
b->irq_enabled = false;
@@ -661,3 +678,7 @@ unsigned int intel_breadcrumbs_busy(struct drm_i915_private *i915)
return mask;
}
+
+#if IS_ENABLED(CONFIG_DRM_I915_SELFTEST)
+#include "selftests/intel_breadcrumbs.c"
+#endif
diff --git a/drivers/gpu/drm/i915/intel_engine_cs.c b/drivers/gpu/drm/i915/intel_engine_cs.c
index 69a6416d1223..538d845d7251 100644
--- a/drivers/gpu/drm/i915/intel_engine_cs.c
+++ b/drivers/gpu/drm/i915/intel_engine_cs.c
@@ -524,3 +524,7 @@ void intel_engine_get_instdone(struct intel_engine_cs *engine,
break;
}
}
+
+#if IS_ENABLED(CONFIG_DRM_I915_SELFTEST)
+#include "selftests/mock_engine.c"
+#endif
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.h b/drivers/gpu/drm/i915/intel_ringbuffer.h
index 8e872730f8eb..a524bf4b2ebc 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.h
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.h
@@ -5,6 +5,7 @@
#include "i915_gem_batch_pool.h"
#include "i915_gem_request.h"
#include "i915_gem_timeline.h"
+#include "i915_selftest.h"
#define I915_CMD_HASH_ORDER 9
@@ -247,6 +248,7 @@ struct intel_engine_cs {
bool irq_enabled : 1;
bool rpm_wakelock : 1;
+ I915_SELFTEST_DECLARE(bool mock : 1);
} breadcrumbs;
/*
diff --git a/drivers/gpu/drm/i915/selftests/i915_mock_selftests.h b/drivers/gpu/drm/i915/selftests/i915_mock_selftests.h
index 5f0bdda42ed8..80458e2a2b04 100644
--- a/drivers/gpu/drm/i915/selftests/i915_mock_selftests.h
+++ b/drivers/gpu/drm/i915/selftests/i915_mock_selftests.h
@@ -10,3 +10,4 @@
*/
selftest(sanitycheck, i915_mock_sanitycheck) /* keep first (igt selfcheck) */
selftest(scatterlist, scatterlist_mock_selftests)
+selftest(breadcrumbs, intel_breadcrumbs_mock_selftests)
diff --git a/drivers/gpu/drm/i915/selftests/intel_breadcrumbs.c b/drivers/gpu/drm/i915/selftests/intel_breadcrumbs.c
new file mode 100644
index 000000000000..a89b25988cc2
--- /dev/null
+++ b/drivers/gpu/drm/i915/selftests/intel_breadcrumbs.c
@@ -0,0 +1,176 @@
+/*
+ * Copyright © 2016 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 "i915_random.h"
+#include "i915_selftest.h"
+
+#include "mock_engine.h"
+
+static int check_rbtree(struct intel_engine_cs *engine,
+ const unsigned long *bitmap,
+ const struct intel_wait *waiters,
+ const int count)
+{
+ struct intel_breadcrumbs *b = &engine->breadcrumbs;
+ struct rb_node *rb;
+ int n;
+
+ if (&b->first_wait->node != rb_first(&b->waiters)) {
+ pr_err("First waiter does not match first element of wait-tree\n");
+ return -EINVAL;
+ }
+
+ n = find_first_bit(bitmap, count);
+ for (rb = rb_first(&b->waiters); rb; rb = rb_next(rb)) {
+ struct intel_wait *w = container_of(rb, typeof(*w), node);
+ int idx = w - waiters;
+
+ if (!test_bit(idx, bitmap)) {
+ pr_err("waiter[%d, seqno=%d] removed but still in wait-tree\n",
+ idx, w->seqno);
+ return -EINVAL;
+ }
+
+ if (n != idx) {
+ pr_err("waiter[%d, seqno=%d] does not match expected next element in tree [%d]\n",
+ idx, w->seqno, n);
+ return -EINVAL;
+ }
+
+ n = find_next_bit(bitmap, count, n + 1);
+ }
+
+ return 0;
+}
+
+static int check_rbtree_empty(struct intel_engine_cs *engine)
+{
+ struct intel_breadcrumbs *b = &engine->breadcrumbs;
+
+ if (b->first_wait) {
+ pr_err("Empty breadcrumbs still has a waiter\n");
+ return -EINVAL;
+ }
+
+ if (!RB_EMPTY_ROOT(&b->waiters)) {
+ pr_err("Empty breadcrumbs, but wait-tree not empty\n");
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int igt_random_insert_remove(void *arg)
+{
+ const u32 seqno_bias = 0x1000;
+ I915_RND_STATE(prng);
+ struct intel_engine_cs *engine = arg;
+ struct intel_wait *waiters;
+ const int count = 4096;
+ int *in_order, *out_order;
+ unsigned long *bitmap;
+ int err = -ENOMEM;
+ int n;
+
+ mock_engine_reset(engine);
+
+ waiters = drm_malloc_gfp(count, sizeof(*waiters), GFP_TEMPORARY);
+ if (!waiters)
+ goto out_engines;
+
+ bitmap = kcalloc(DIV_ROUND_UP(count, BITS_PER_LONG), sizeof(*bitmap),
+ GFP_TEMPORARY);
+ if (!bitmap)
+ goto out_waiters;
+
+ in_order = i915_random_order(count, &prng);
+ if (!in_order)
+ goto out_bitmap;
+
+ out_order = i915_random_order(count, &prng);
+ if (!out_order)
+ goto out_order;
+
+ for (n = 0; n < count; n++)
+ intel_wait_init(&waiters[n], seqno_bias + n);
+
+ err = check_rbtree(engine, bitmap, waiters, count);
+ if (err)
+ goto err;
+
+ /* Add and remove waiters into the rbtree in random order. At each
+ * step, we verify that the rbtree is correctly ordered.
+ */
+ for (n = 0; n < count; n++) {
+ int i = in_order[n];
+
+ intel_engine_add_wait(engine, &waiters[i]);
+ __set_bit(i, bitmap);
+
+ err = check_rbtree(engine, bitmap, waiters, count);
+ if (err)
+ goto err;
+ }
+ for (n = 0; n < count; n++) {
+ int i = out_order[n];
+
+ intel_engine_remove_wait(engine, &waiters[i]);
+ __clear_bit(i, bitmap);
+
+ err = check_rbtree(engine, bitmap, waiters, count);
+ if (err)
+ goto err;
+ }
+
+ err = check_rbtree_empty(engine);
+err:
+ kfree(out_order);
+out_order:
+ kfree(in_order);
+out_bitmap:
+ kfree(bitmap);
+out_waiters:
+ drm_free_large(waiters);
+out_engines:
+ mock_engine_flush(engine);
+ return err;
+}
+
+int intel_breadcrumbs_mock_selftests(void)
+{
+ static const struct i915_subtest tests[] = {
+ SUBTEST(igt_random_insert_remove),
+ };
+ struct intel_engine_cs *engine;
+ int err;
+
+ engine = mock_engine("mock");
+ if (!engine)
+ return -ENOMEM;
+
+ err = i915_subtests(tests, engine);
+ kfree(engine);
+
+ return err;
+}
diff --git a/drivers/gpu/drm/i915/selftests/mock_engine.c b/drivers/gpu/drm/i915/selftests/mock_engine.c
new file mode 100644
index 000000000000..4a090bbe807b
--- /dev/null
+++ b/drivers/gpu/drm/i915/selftests/mock_engine.c
@@ -0,0 +1,55 @@
+/*
+ * Copyright © 2016 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 "mock_engine.h"
+
+struct intel_engine_cs *mock_engine(const char *name)
+{
+ struct intel_engine_cs *engine;
+ static int id;
+
+ engine = kzalloc(sizeof(*engine) + PAGE_SIZE, GFP_KERNEL);
+ if (!engine)
+ return NULL;
+
+ /* minimal engine setup for seqno */
+ engine->name = name;
+ engine->id = id++;
+ engine->status_page.page_addr = (void *)(engine + 1);
+
+ /* minimal breadcrumbs init */
+ spin_lock_init(&engine->breadcrumbs.lock);
+ engine->breadcrumbs.mock = true;
+
+ return engine;
+}
+
+void mock_engine_flush(struct intel_engine_cs *engine)
+{
+}
+
+void mock_engine_reset(struct intel_engine_cs *engine)
+{
+ intel_write_status_page(engine, I915_GEM_HWS_INDEX, 0);
+}
diff --git a/drivers/gpu/drm/i915/selftests/mock_engine.h b/drivers/gpu/drm/i915/selftests/mock_engine.h
new file mode 100644
index 000000000000..0ae9a94aaa1e
--- /dev/null
+++ b/drivers/gpu/drm/i915/selftests/mock_engine.h
@@ -0,0 +1,32 @@
+/*
+ * Copyright © 2016 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.
+ *
+ */
+
+#ifndef __MOCK_ENGINE_H__
+#define __MOCK_ENGINE_H__
+
+struct intel_engine_cs *mock_engine(const char *name);
+void mock_engine_flush(struct intel_engine_cs *engine);
+void mock_engine_reset(struct intel_engine_cs *engine);
+
+#endif /* !__MOCK_ENGINE_H__ */
--
2.11.0
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