[PATCH i-g-t 5/5] igt: Add gem_exec_balancer

[Chris Wilson <chris@chris-wilson.co.uk>]

Exercise the in-kernel load balancer checking that we can distribute
batches across the set of ctx->engines to avoid load.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
---
 tests/Makefile.am         |   1 +
 tests/Makefile.sources    |   1 +
 tests/gem_exec_balancer.c | 469 ++++++++++++++++++++++++++++++++++++++
 tests/meson.build         |   7 +
 4 files changed, 478 insertions(+)
 create mode 100644 tests/gem_exec_balancer.c

diff --git a/tests/Makefile.am b/tests/Makefile.am
index ee5a7c5e8..71cdcaaaa 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -107,6 +107,7 @@ gem_close_race_CFLAGS = $(AM_CFLAGS) $(THREAD_CFLAGS)
 gem_close_race_LDADD = $(LDADD) -lpthread
 gem_ctx_thrash_CFLAGS = $(AM_CFLAGS) $(THREAD_CFLAGS)
 gem_ctx_thrash_LDADD = $(LDADD) -lpthread
+gem_exec_balancer_LDADD = $(LDADD) $(top_builddir)/lib/libigt_perf.la
 gem_exec_parallel_CFLAGS = $(AM_CFLAGS) $(THREAD_CFLAGS)
 gem_exec_parallel_LDADD = $(LDADD) -lpthread
 gem_fence_thrash_CFLAGS = $(AM_CFLAGS) $(THREAD_CFLAGS)
diff --git a/tests/Makefile.sources b/tests/Makefile.sources
index 4e42a4f05..70a144798 100644
--- a/tests/Makefile.sources
+++ b/tests/Makefile.sources
@@ -67,6 +67,7 @@ TESTS_progs = \
 	gem_exec_async \
 	gem_exec_await \
 	gem_exec_bad_domains \
+	gem_exec_balancer \
 	gem_exec_basic \
 	gem_exec_big \
 	gem_exec_blt \
diff --git a/tests/gem_exec_balancer.c b/tests/gem_exec_balancer.c
new file mode 100644
index 000000000..954696cb8
--- /dev/null
+++ b/tests/gem_exec_balancer.c
@@ -0,0 +1,469 @@
+/*
+ * Copyright © 2018 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 <sched.h>
+
+#include "igt.h"
+#include "igt_perf.h"
+#include "i915/gem_ring.h"
+#include "sw_sync.h"
+
+IGT_TEST_DESCRIPTION("Exercise in-kernel load-balancing");
+
+#define I915_CONTEXT_PARAM_ENGINES 0x7
+
+struct class_instance {
+	uint32_t class;
+	uint32_t instance;
+};
+#define INSTANCE_COUNT (1 << I915_PMU_SAMPLE_INSTANCE_BITS)
+
+static bool has_class_instance(int i915, uint32_t class, uint32_t instance)
+{
+	int fd;
+
+	fd = perf_i915_open(I915_PMU_ENGINE_BUSY(class, instance));
+	if (fd != -1) {
+		close(fd);
+		return true;
+	}
+
+	return false;
+}
+
+static struct class_instance *
+list_engines(int i915, uint32_t class_mask, unsigned int *out)
+{
+	unsigned int count = 0, size = 64;
+	struct class_instance *engines;
+
+	engines = malloc(size * sizeof(*engines));
+	if (!engines) {
+		*out = 0;
+		return NULL;
+	}
+
+	for (enum drm_i915_gem_engine_class class = I915_ENGINE_CLASS_RENDER;
+	     class_mask;
+	     class++, class_mask >>= 1) {
+		if (!(class_mask & 1))
+			continue;
+
+		for (unsigned int instance = 0;
+		     instance < INSTANCE_COUNT;
+		     instance++) {
+		     if (!has_class_instance(i915, class, instance))
+			     continue;
+
+			if (count == size) {
+				struct class_instance *e;
+
+				size *= 2;
+				e = realloc(engines, size*sizeof(*engines));
+				if (!e) {
+					*out = count;
+					return engines;
+				}
+
+				engines = e;
+			}
+
+			engines[count++] = (struct class_instance){
+				.class = class,
+				.instance = instance,
+			};
+		}
+	}
+
+	if (!count) {
+		free(engines);
+		engines = NULL;
+	}
+
+	*out = count;
+	return engines;
+}
+
+static int __set_load_balancer(int i915, uint32_t ctx,
+			       const struct class_instance *ci,
+			       unsigned int count)
+{
+#define I915_CONTEXT_ENGINES_EXT_LOAD_BALANCE 0
+	struct balancer {
+		uint64_t next_extension;
+		uint64_t name;
+
+		uint64_t flags;
+		uint64_t mask;
+
+		uint64_t mbz[4];
+	} balancer = {
+		.name = I915_CONTEXT_ENGINES_EXT_LOAD_BALANCE,
+		.mask = ~0ull,
+	};
+	struct engines {
+		uint64_t extension;
+		uint64_t class_instance[count];
+	} engines;
+	struct drm_i915_gem_context_param p = {
+		.ctx_id = ctx,
+		.param = I915_CONTEXT_PARAM_ENGINES,
+		.size = sizeof(engines),
+		.value = to_user_pointer(&engines)
+	};
+
+	engines.extension = to_user_pointer(&balancer);
+	memcpy(engines.class_instance, ci, sizeof(engines.class_instance));
+
+	return __gem_context_set_param(i915, &p);
+}
+
+static void set_load_balancer(int i915, uint32_t ctx,
+			      const struct class_instance *ci,
+			      unsigned int count)
+{
+	igt_assert_eq(__set_load_balancer(i915, ctx, ci, count), 0);
+}
+
+static uint32_t load_balancer_create(int i915,
+				     const struct class_instance *ci,
+				     unsigned int count)
+{
+	uint32_t ctx;
+
+	ctx = gem_queue_create(i915);
+	set_load_balancer(i915, ctx, ci, count);
+
+	return ctx;
+}
+
+static void kick_kthreads(int period_us)
+{
+	sched_yield();
+	usleep(period_us);
+}
+
+static double measure_load(int pmu, int period_us)
+{
+	uint64_t data[2];
+	uint64_t d_t, d_v;
+
+	kick_kthreads(period_us);
+
+	igt_assert_eq(read(pmu, data, sizeof(data)), sizeof(data));
+	d_v = -data[0];
+	d_t = -data[1];
+
+	usleep(period_us);
+
+	igt_assert_eq(read(pmu, data, sizeof(data)), sizeof(data));
+	d_v += data[0];
+	d_t += data[1];
+
+	return d_v / (double)d_t;
+}
+
+static double measure_min_load(int pmu, unsigned int num, int period_us)
+{
+	uint64_t data[2 + num];
+	uint64_t d_t, d_v[num];
+	uint64_t min = -1, max = 0;
+
+	kick_kthreads(period_us);
+
+	igt_assert_eq(read(pmu, data, sizeof(data)), sizeof(data));
+	for (unsigned int n = 0; n < num; n++)
+		d_v[n] = -data[2 + n];
+	d_t = -data[1];
+
+	usleep(period_us);
+
+	igt_assert_eq(read(pmu, data, sizeof(data)), sizeof(data));
+
+	d_t += data[1];
+	for (unsigned int n = 0; n < num; n++) {
+		d_v[n] += data[2 + n];
+		igt_debug("engine[%d]: %.1f%%\n",
+			  n, d_v[n] / (double)d_t * 100);
+		if (d_v[n] < min)
+			min = d_v[n];
+		if (d_v[n] > max)
+			max = d_v[n];
+	}
+
+	igt_debug("elapsed: %"PRIu64"ns, load [%.1f, %.1f]%%\n",
+		  d_t, min / (double)d_t * 100,  max / (double)d_t * 100);
+
+	return min / (double)d_t;
+}
+
+static void check_individual_engine(int i915,
+				    uint32_t ctx,
+				    const struct class_instance *ci,
+				    int idx)
+{
+	igt_spin_t *spin;
+	double load;
+	int pmu;
+
+	pmu = perf_i915_open(I915_PMU_ENGINE_BUSY(ci[idx].class,
+						  ci[idx].instance));
+
+	spin = igt_spin_batch_new(i915, .ctx = ctx, .engine = idx + 1);
+	load = measure_load(pmu, 10000);
+	igt_spin_batch_free(i915, spin);
+
+	close(pmu);
+
+	igt_assert_f(load > 0.90,
+		     "engine %d (class:instance %d:%d) was found to be only %.1f%% busy\n",
+		     idx, ci[idx].class, ci[idx].instance, load*100);
+}
+
+static void individual(int i915)
+{
+	uint32_t ctx;
+
+	/*
+	 * I915_CONTEXT_PARAM_ENGINE allows us to index into the user
+	 * supplied array from gem_execbuf(). Our check is to build the
+	 * ctx->engine[] with various different engine classes, feed in
+	 * a spinner and then ask pmu to confirm it the expected engine
+	 * was busy.
+	 */
+
+	ctx = gem_queue_create(i915);
+
+	for (int mask = 0; mask < 32; mask++) {
+		struct class_instance *ci;
+		unsigned int count;
+
+		ci = list_engines(i915, 1u << mask, &count);
+		if (!ci)
+			continue;
+
+		igt_debug("Found %d engines of class %d\n", count, mask);
+
+		for (int pass = 0; pass < count; pass++) { /* approx. count! */
+			igt_permute_array(ci, count, igt_exchange_int64);
+			set_load_balancer(i915, ctx, ci, count);
+			for (unsigned int n = 0; n < count; n++)
+				check_individual_engine(i915, ctx, ci, n);
+		}
+
+		free(ci);
+	}
+
+	gem_context_destroy(i915, ctx);
+}
+
+static int add_pmu(int pmu, const struct class_instance *ci)
+{
+	return perf_i915_open_group(I915_PMU_ENGINE_BUSY(ci->class,
+							 ci->instance),
+				    pmu);
+}
+
+static uint32_t batch_create(int i915)
+{
+	const uint32_t bbe = MI_BATCH_BUFFER_END;
+	uint32_t handle;
+
+	handle = gem_create(i915, 4096);
+	gem_write(i915, handle, 0, &bbe, sizeof(bbe));
+
+	return handle;
+}
+
+static void full(int i915, unsigned int flags)
+#define PULSE 0x1
+#define LATE 0x2
+{
+	struct drm_i915_gem_exec_object2 batch = {
+		.handle = batch_create(i915),
+	};
+
+	if (flags & LATE)
+		igt_require_sw_sync();
+
+	/*
+	 * I915_CONTEXT_PARAM_ENGINE changes the meaning of I915_EXEC_DEFAULT
+	 * to provide an automatic selection from the ctx->engine[]. It
+	 * employs load-balancing to evenly distribute the workload the
+	 * array. If we submit N spinners, we expect them to be simultaneously
+	 * running across N engines and use PMU to confirm that the entire
+	 * set of engines are busy.
+	 *
+	 * We complicate matters by interpersing shortlived tasks to challenge
+	 * the kernel to search for space in which to insert new batches.
+	 */
+
+
+	for (int mask = 0; mask < 32; mask++) {
+		struct class_instance *ci;
+		igt_spin_t *spin = NULL;
+		unsigned int count;
+		IGT_CORK_FENCE(cork);
+		double load;
+		int fence = -1;
+		int *pmu;
+
+		ci = list_engines(i915, 1u << mask, &count);
+		if (!ci)
+			continue;
+
+		igt_debug("Found %d engines of class %d\n", count, mask);
+
+		pmu = malloc(sizeof(*pmu) * count);
+		igt_assert(pmu);
+
+		if (flags & LATE)
+			fence = igt_cork_plug(&cork, i915);
+
+		pmu[0] = -1;
+		for (unsigned int n = 0; n < count; n++) {
+			uint32_t ctx;
+
+			pmu[n] = add_pmu(pmu[0], &ci[n]);
+
+			if (flags & PULSE) {
+				struct drm_i915_gem_execbuffer2 eb = {
+					.buffers_ptr = to_user_pointer(&batch),
+					.buffer_count = 1,
+					.rsvd2 = fence,
+					.flags = flags & LATE ? I915_EXEC_FENCE_IN : 0,
+				};
+
+				gem_execbuf(i915, &eb);
+			}
+
+			/*
+			 * Each spinner needs to be one a new timeline,
+			 * otherwise they will just sit in the single queue
+			 * and not run concurrently.
+			 */
+			ctx = load_balancer_create(i915, ci, count);
+
+			if (spin == NULL) {
+				spin = __igt_spin_batch_new(i915, ctx, 0, 0);
+			} else {
+				struct drm_i915_gem_exec_object2 obj = {
+					.handle = spin->handle,
+				};
+				struct drm_i915_gem_execbuffer2 eb = {
+					.buffers_ptr = to_user_pointer(&obj),
+					.buffer_count = 1,
+					.rsvd1 = ctx,
+					.rsvd2 = fence,
+					.flags = flags & LATE ? I915_EXEC_FENCE_IN : 0,
+				};
+
+				gem_execbuf(i915, &eb);
+			}
+
+			gem_context_destroy(i915, ctx);
+		}
+
+		if (flags & LATE) {
+			igt_cork_unplug(&cork);
+			close(fence);
+		}
+
+		load = measure_min_load(pmu[0], count, 10000);
+		igt_spin_batch_free(i915, spin);
+
+		close(pmu[0]);
+		free(pmu);
+
+		free(ci);
+
+		igt_assert_f(load > 0.90,
+			     "minimum load for %d x class:%d was found to be only %.1f%% busy\n",
+			     count, mask, load*100);
+	}
+
+	gem_close(i915, batch.handle);
+}
+
+static bool has_context_engines(int i915)
+{
+	struct drm_i915_gem_context_param p = {
+		.param = I915_CONTEXT_PARAM_ENGINES,
+	};
+
+	return __gem_context_set_param(i915, &p) == 0;
+}
+
+static bool has_load_balancer(int i915)
+{
+	struct class_instance ci = {};
+	uint32_t ctx;
+	int err;
+
+	ctx = gem_queue_create(i915);
+	err = __set_load_balancer(i915, ctx, &ci, 1);
+	gem_context_destroy(i915, ctx);
+
+	return err == 0;
+}
+
+igt_main
+{
+	int i915 = -1;
+
+	igt_skip_on_simulation();
+
+	igt_fixture {
+		i915 = drm_open_driver(DRIVER_INTEL);
+		igt_require_gem(i915);
+
+		gem_require_contexts(i915);
+		igt_require(has_context_engines(i915));
+		igt_require(has_load_balancer(i915));
+
+		igt_fork_hang_detector(i915);
+	}
+
+	igt_subtest("individual")
+		individual(i915);
+
+	igt_subtest_group {
+		static const struct {
+			const char *name;
+			unsigned int flags;
+		} phases[] = {
+			{ "", 0 },
+			{ "-pulse", PULSE },
+			{ "-late", LATE },
+			{ "-late-pulse", PULSE | LATE },
+			{ }
+		};
+		for (typeof(*phases) *p = phases; p->name; p++)
+			igt_subtest_f("full%s", p->name)
+				full(i915, p->flags);
+	}
+
+	igt_fixture {
+		igt_stop_hang_detector();
+	}
+}
diff --git a/tests/meson.build b/tests/meson.build
index b6da4f479..420d626fb 100644
--- a/tests/meson.build
+++ b/tests/meson.build
@@ -256,6 +256,13 @@ test_executables += executable('gem_eio', 'gem_eio.c',
 	   install : true)
 test_progs += 'gem_eio'
 
+test_executables += executable('gem_exec_balancer', 'gem_exec_balancer.c',
+	   dependencies : test_deps + [ lib_igt_perf ],
+	   install_dir : libexecdir,
+	   install_rpath : libexecdir_rpathdir,
+	   install : true)
+test_progs += 'gem_exec_balancer'
+
 test_executables += executable('gem_mocs_settings', 'gem_mocs_settings.c',
 	   dependencies : test_deps + [ lib_igt_perf ],
 	   install_dir : libexecdir,
-- 
2.19.0

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