[RFC] benchmarks/gem_slice_shutdown: microbenchmark for slice shutdown delays

[RFC] benchmarks/gem_slice_shutdown: microbenchmark for slice shutdown delays

[Oscar Mateo]

Cc: Dmitry Rogozhkin <dmitry.v.rogozhkin@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Oscar Mateo <oscar.mateo@intel.com>
---
 benchmarks/Makefile.sources     |   1 +
 benchmarks/gem_slice_shutdown.c | 295 ++++++++++++++++++++++++++++++++++++++++
 2 files changed, 296 insertions(+)
 create mode 100644 benchmarks/gem_slice_shutdown.c

diff --git a/benchmarks/Makefile.sources b/benchmarks/Makefile.sources
index 3a94115..591b5ae 100644
--- a/benchmarks/Makefile.sources
+++ b/benchmarks/Makefile.sources
@@ -13,6 +13,7 @@ benchmarks_prog_list =			\
 	gem_mmap			\
 	gem_prw				\
 	gem_set_domain			\
+	gem_slice_shutdown		\
 	gem_syslatency			\
 	gem_wsim			\
 	kms_vblank			\
diff --git a/benchmarks/gem_slice_shutdown.c b/benchmarks/gem_slice_shutdown.c
new file mode 100644
index 0000000..dcb17c1
--- /dev/null
+++ b/benchmarks/gem_slice_shutdown.c
@@ -0,0 +1,295 @@
+/*
+ * 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.
+ *
+ * Authors:
+ *    Oscar Mateo <oscar.mateo@intel.com>
+ *
+ */
+
+/*
+ * This tool measures time to change the configuration of number of slices
+ */
+
+#include <unistd.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <string.h>
+#include <fcntl.h>
+#include <inttypes.h>
+#include <errno.h>
+#include <sys/stat.h>
+#include <sys/ioctl.h>
+#include <sys/time.h>
+#include <time.h>
+#include <assert.h>
+
+#include "drm.h"
+#include "ioctl_wrappers.h"
+#include "drmtest.h"
+#include "intel_io.h"
+#include "igt_stats.h"
+#include "intel_chipset.h"
+#include "intel_bufmgr.h"
+
+#define GEN8_R_PWR_CLK_STATE	(0x20C8)
+#define   GEN8_RPCS_ENABLE		(1 << 31)
+#define   GEN8_RPCS_S_CNT_ENABLE	(1 << 18)
+#define   GEN8_RPCS_S_CNT_SHIFT		15
+#define   GEN8_RPCS_S_CNT_MASK		(0x7 << GEN8_RPCS_S_CNT_SHIFT)
+#define   GEN8_RPCS_SS_CNT_ENABLE	(1 << 11)
+#define   GEN8_RPCS_SS_CNT_SHIFT	8
+#define   GEN8_RPCS_SS_CNT_MASK		(0x7 << GEN8_RPCS_SS_CNT_SHIFT)
+#define   GEN8_RPCS_EU_MAX_SHIFT	4
+#define   GEN8_RPCS_EU_MAX_MASK		(0xf << GEN8_RPCS_EU_MAX_SHIFT)
+#define   GEN8_RPCS_EU_MIN_SHIFT	0
+#define   GEN8_RPCS_EU_MIN_MASK		(0xf << GEN8_RPCS_EU_MIN_SHIFT)
+
+static const char *yesno(bool x)
+{
+	return x ? "yes" : "no";
+}
+
+static void print_rpcs_config(uint32_t rpcs_config)
+{
+	bool rpcs_enable, s_enable, ss_enable;
+	uint s_count, ss_count, eu_max, eu_min;
+
+	rpcs_enable = rpcs_config & GEN8_RPCS_ENABLE;
+	s_enable    = rpcs_config & GEN8_RPCS_S_CNT_ENABLE;
+	ss_enable   = rpcs_config & GEN8_RPCS_SS_CNT_ENABLE;
+	s_count  = (rpcs_config & GEN8_RPCS_S_CNT_MASK)  >> GEN8_RPCS_S_CNT_SHIFT;
+	ss_count = (rpcs_config & GEN8_RPCS_SS_CNT_MASK) >> GEN8_RPCS_SS_CNT_SHIFT;
+	eu_max   = (rpcs_config & GEN8_RPCS_EU_MAX_MASK) >> GEN8_RPCS_EU_MAX_SHIFT;
+	eu_min   = (rpcs_config & GEN8_RPCS_EU_MIN_MASK) >> GEN8_RPCS_EU_MIN_SHIFT;
+	printf("RPCS enabled: %s\n", yesno(rpcs_enable));
+	printf("Slice count enabled: %s, count: %u\n", yesno(s_enable), s_count);
+	printf("Subslice count enabled: %s, count: %u\n", yesno(ss_enable), ss_count);
+	printf("EU max: %u, min: %u\n", eu_max, eu_min);
+}
+
+static void init_buffer(drm_intel_bufmgr *bufmgr,
+			struct igt_buf *buf,
+			uint32_t size)
+{
+	buf->bo = drm_intel_bo_alloc(bufmgr, "", size, 4096);
+	buf->size = size;
+	buf->tiling = I915_TILING_NONE;
+	buf->stride = 4096;
+}
+
+static double elapsed(const struct timespec *start, const struct timespec *end)
+{
+	return 1e6*(end->tv_sec - start->tv_sec) + 1e-3*(end->tv_nsec - start->tv_nsec);
+}
+
+#define MI_STORE_REGISTER_MEM_64_BIT_ADDR	((0x24 << 23) | 2)
+
+static uint32_t do_read_pwrclk_state(drm_intel_bufmgr *bufmgr,
+				     struct intel_batchbuffer *batch,
+				     drm_intel_context *context)
+{
+	uint32_t rpcs_config;
+	uint32_t *data;
+	drm_intel_bo *dst_bo;
+
+	dst_bo = drm_intel_bo_alloc(bufmgr, "dst", 4, 4096);
+
+	BEGIN_BATCH(3, 1);
+	OUT_BATCH(MI_STORE_REGISTER_MEM_64_BIT_ADDR);
+	OUT_BATCH(GEN8_R_PWR_CLK_STATE);
+	OUT_RELOC(dst_bo, I915_GEM_DOMAIN_RENDER, I915_GEM_DOMAIN_RENDER, 0);
+	ADVANCE_BATCH();
+
+	intel_batchbuffer_flush_with_context(batch, context);
+
+	drm_intel_bo_map(dst_bo, 1);
+
+	data = dst_bo->virtual;
+	rpcs_config = *data;
+
+	drm_intel_bo_unmap(dst_bo);
+
+	drm_intel_bo_unreference(dst_bo);
+
+	return rpcs_config;
+}
+
+#define LOCAL_MI_LOAD_REGISTER_IMM	(0x22 << 23)
+
+#define GFX_OP_PIPE_CONTROL(len)	((0x3<<29)|(0x3<<27)|(0x2<<24)|((len)-2))
+#define   PIPE_CONTROL_CS_STALL				(1<<20)
+#define   PIPE_CONTROL_RENDER_TARGET_CACHE_FLUSH	(1<<12)
+#define   PIPE_CONTROL_FLUSH_ENABLE			(1<<7)
+#define   PIPE_CONTROL_DC_FLUSH_ENABLE			(1<<5)
+#define   PIPE_CONTROL_DEPTH_CACHE_FLUSH		(1<<0)
+
+static void emit_config_slice_count(drm_intel_bufmgr *bufmgr,
+				    struct intel_batchbuffer *batch,
+				    drm_intel_context *context,
+				    uint32_t rpcs_config)
+{
+	drm_intel_bo *dst_bo;
+
+	dst_bo = drm_intel_bo_alloc(bufmgr, "scratch", 4, 4096);
+
+	BEGIN_BATCH(9, 1);
+	OUT_BATCH(LOCAL_MI_LOAD_REGISTER_IMM | 1);
+	OUT_BATCH(GEN8_R_PWR_CLK_STATE);
+	OUT_BATCH(rpcs_config);
+	OUT_BATCH(GFX_OP_PIPE_CONTROL(6));
+	OUT_BATCH(PIPE_CONTROL_RENDER_TARGET_CACHE_FLUSH |
+		  PIPE_CONTROL_DEPTH_CACHE_FLUSH |
+		  PIPE_CONTROL_DC_FLUSH_ENABLE |
+		  PIPE_CONTROL_FLUSH_ENABLE |
+		  PIPE_CONTROL_CS_STALL);
+	OUT_RELOC(dst_bo, I915_GEM_DOMAIN_RENDER, I915_GEM_DOMAIN_RENDER, 0);
+	OUT_BATCH(0);
+	OUT_BATCH(0);
+	OUT_BATCH(0);
+	ADVANCE_BATCH();
+
+	drm_intel_bo_unreference(dst_bo);
+}
+
+static void do_test(igt_render_copyfunc_t rendercopy,
+		    drm_intel_bufmgr *bufmgr,
+		    drm_intel_context *context,
+		    struct intel_batchbuffer *batch,
+		    uint32_t rpcs_config,
+		    struct igt_buf *src,
+		    struct igt_buf *dst,
+		    uint c)
+{
+	rpcs_config &= ~GEN8_RPCS_S_CNT_MASK;
+	rpcs_config |= (c << GEN8_RPCS_S_CNT_SHIFT);
+
+	emit_config_slice_count(bufmgr, batch, context, rpcs_config);
+	rendercopy(batch, context, src, 0, 0, 0, 0, dst, 0, 0);
+	drm_intel_bo_wait_rendering(dst->bo);
+}
+
+static void do_measures(igt_render_copyfunc_t rendercopy,
+			drm_intel_bufmgr *bufmgr,
+			drm_intel_context *context,
+			struct intel_batchbuffer *batch,
+			uint32_t rpcs_config,
+			struct igt_buf *src,
+			struct igt_buf *dst,
+			uint c1, uint c2)
+{
+	uint c = c1;
+	struct igt_mean real[2], baseline[2];
+	struct timespec start, end;
+	int i, j;
+
+	for (i = 0; i < 2; i++) {
+		igt_mean_init(&real[i]);
+		igt_mean_init(&baseline[i]);
+	}
+
+	/* Initial config and warm up */
+	do_test(rendercopy, bufmgr, context, batch, rpcs_config, src, dst, c);
+
+#define LOOPS 1000
+	for (j = 0; j < LOOPS; j++) {
+		c = c2;
+		for (i = 0; i < 2; i++) {
+			clock_gettime(CLOCK_MONOTONIC, &start);
+			do_test(rendercopy, bufmgr, context, batch,
+				rpcs_config, src, dst, c);
+			clock_gettime(CLOCK_MONOTONIC, &end);
+
+			igt_mean_add(&real[i], elapsed(&start, &end));
+
+			clock_gettime(CLOCK_MONOTONIC, &start);
+			do_test(rendercopy, bufmgr, context, batch,
+				rpcs_config, src, dst, c);
+			clock_gettime(CLOCK_MONOTONIC, &end);
+
+			igt_mean_add(&baseline[i], elapsed(&start, &end));
+
+			c = c1;
+		}
+	}
+
+	printf("Slice poweron time (%u -> %u): %7.3f us\n", c1, c2,
+		igt_mean_get(&real[0]) - igt_mean_get(&baseline[0]));
+	printf("Slice shutdown time (%u -> %u): %7.3f us\n", c2, c1,
+		igt_mean_get(&real[1]) - igt_mean_get(&baseline[1]));
+
+	printf("\n");
+}
+
+static void slice_shutdown(int fd, int devid)
+{
+	igt_render_copyfunc_t rendercopy = igt_get_render_copyfunc(devid);
+	drm_intel_bufmgr *bufmgr = drm_intel_bufmgr_gem_init(fd, 4096);
+	drm_intel_context *context = drm_intel_gem_context_create(bufmgr);
+	struct intel_batchbuffer *batch = intel_batchbuffer_alloc(bufmgr, devid);
+	struct igt_buf src, dst;
+	uint32_t rpcs_config;
+	bool rpcs_enable, s_enable;
+	int s_count;
+	uint i, j;
+
+	init_buffer(bufmgr, &src, 10*4096*4096);
+	init_buffer(bufmgr, &dst, 10*4096*4096);
+
+	rpcs_config = do_read_pwrclk_state(bufmgr, batch, context);
+	print_rpcs_config(rpcs_config);
+
+	rpcs_enable = rpcs_config & GEN8_RPCS_ENABLE;
+	s_enable = rpcs_config & GEN8_RPCS_S_CNT_ENABLE;
+
+	if (!rpcs_enable || !s_enable) {
+		fprintf(stderr, "We need slice count to be already enabled\n");
+		exit(-1);
+	}
+
+	s_count = (rpcs_config & GEN8_RPCS_S_CNT_MASK) >> GEN8_RPCS_S_CNT_SHIFT;
+
+	for (i = 1; i <= s_count; i++)
+		for (j = i + 1; j <= s_count; j++)
+			do_measures(rendercopy, bufmgr, context, batch,
+				    rpcs_config, &src, &dst, i, j);
+
+	intel_batchbuffer_free(batch);
+	drm_intel_gem_context_destroy(context);
+	drm_intel_bufmgr_destroy(bufmgr);
+}
+
+int main(int argc, char **argv)
+{
+	int fd, devid;
+
+	fd = drm_open_driver(DRIVER_INTEL);
+
+	devid = intel_get_drm_devid(fd);
+	if (intel_gen(devid) < 8) {
+		fprintf(stderr, "gen8+ required, yours is gen%u\n",
+				intel_gen(devid));
+		exit(-1);
+	}
+
+	slice_shutdown(fd, devid);
+}
-- 
1.9.1

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