[Intel-gfx] [PATCH 1/3] intel_perf_counters: a little tool for dumping performance counters.

[Kenneth Graunke]

From: Eric Anholt <eric at anholt.net>

This reads the GPU's performance counters via MI_REPORT_PERF_COUNT and
prints them in a top-style interface.  While it can be useful in and of
itself, it also documents the performance counters and lets us verify
that they're working.

Currently, it only supports Ironlake.

v2 [Ken]: Rebase on master and fix compilation failures; make it abort
on non-Ironlake platforms to avoid GPU hangs; rename from 'chaps' to
intel_perf_counters since that acronym isn't used any longer; write the
above commit message.
---
 tools/Makefile.am           |   1 +
 tools/intel_perf_counters.c | 175 ++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 176 insertions(+)
 create mode 100644 tools/intel_perf_counters.c

diff --git a/tools/Makefile.am b/tools/Makefile.am
index bb3328f..e939518 100644
--- a/tools/Makefile.am
+++ b/tools/Makefile.am
@@ -12,6 +12,7 @@ bin_PROGRAMS = 				\
 	intel_gpu_top 			\
 	intel_gpu_time 			\
 	intel_gtt 			\
+	intel_perf_counters		\
 	intel_stepping 			\
 	intel_reg_checker 		\
 	intel_reg_dumper 		\
diff --git a/tools/intel_perf_counters.c b/tools/intel_perf_counters.c
new file mode 100644
index 0000000..53d2ad7
--- /dev/null
+++ b/tools/intel_perf_counters.c
@@ -0,0 +1,175 @@
+/*
+ * Copyright © 2010, 2013 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:
+ *    Eric Anholt <eric at anholt.net>
+ */
+
+#include <unistd.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <err.h>
+#include <sys/ioctl.h>
+
+#include "drm.h"
+#include "i915_drm.h"
+#include "drmtest.h"
+#include "intel_gpu_tools.h"
+#include "intel_bufmgr.h"
+#include "intel_batchbuffer.h"
+
+#define COUNTER_COUNT 29
+
+const char *counter_name[COUNTER_COUNT] = {
+	"cycles the CS unit is starved",
+	"cycles the CS unit is stalled",
+	"cycles the VF unit is starved",
+	"cycles the VF unit is stalled",
+	"cycles the VS unit is starved",
+	"cycles the VS unit is stalled",
+	"cycles the GS unit is starved",
+	"cycles the GS unit is stalled",
+	"cycles the CL unit is starved",
+	"cycles the CL unit is stalled",
+	"cycles the SF unit is starved",
+	"cycles the SF unit is stalled",
+	"cycles the WZ unit is starved",
+	"cycles the WZ unit is stalled",
+	"Z buffer read/write          ",
+	"cycles each EU was active    ",
+	"cycles each EU was suspended ",
+	"cycles threads loaded all EUs",
+	"cycles filtering active      ",
+	"cycles PS threads executed   ",
+	"subspans written to RC       ",
+	"bytes read for texture reads ",
+	"texels returned from sampler ",
+	"polygons not culled          ",
+	"clocks MASF has valid message",
+	"64b writes/reads from RC     ",
+	"reads on dataport            ",
+	"clocks MASF has valid msg not consumed by sampler",
+	"cycles any EU is stalled for math",
+};
+
+int have_totals = 0;
+uint32_t totals[COUNTER_COUNT];
+uint32_t last_counter[COUNTER_COUNT];
+static drm_intel_bufmgr *bufmgr;
+struct intel_batchbuffer *batch;
+
+/* DW0 */
+#define MI_REPORT_PERF_COUNT ((0x26 << 23) | (3 - 2))
+#define MI_COUNTER_SET_0	(0 << 6)
+#define MI_COUNTER_SET_1	(1 << 6)
+/* DW1 */
+#define MI_COUNTER_ADDRESS_GTT	(1 << 0)
+/* DW2: report ID */
+
+static void
+get_counters(void)
+{
+	int i;
+	drm_intel_bo *stats_bo;
+	uint32_t *stats_result;
+
+	stats_bo = drm_intel_bo_alloc(bufmgr, "stats", 4096, 4096);
+
+	BEGIN_BATCH(6);
+	OUT_BATCH(MI_REPORT_PERF_COUNT | MI_COUNTER_SET_0);
+	OUT_RELOC(stats_bo,
+		  I915_GEM_DOMAIN_INSTRUCTION, I915_GEM_DOMAIN_INSTRUCTION,
+		  0);
+	OUT_BATCH(0);
+
+	OUT_BATCH(MI_REPORT_PERF_COUNT | MI_COUNTER_SET_1);
+	OUT_RELOC(stats_bo,
+		  I915_GEM_DOMAIN_INSTRUCTION, I915_GEM_DOMAIN_INSTRUCTION,
+		  64);
+	OUT_BATCH(0);
+
+	ADVANCE_BATCH();
+
+	intel_batchbuffer_flush(batch);
+
+	drm_intel_bo_map(stats_bo, 0);
+	stats_result = stats_bo->virtual;
+	/* skip REPORT_ID, TIMESTAMP */
+	stats_result += 3;
+	for (i = 0 ; i < COUNTER_COUNT; i++) {
+		totals[i] += stats_result[i] - last_counter[i];
+		last_counter[i] = stats_result[i];
+	}
+
+	drm_intel_bo_unmap(stats_bo);
+	drm_intel_bo_unreference(stats_bo);
+}
+
+#define STATS_CHECK_FREQUENCY	100
+#define STATS_REPORT_FREQUENCY	2
+
+int
+main(int argc, char **argv)
+{
+	uint32_t devid;
+	int i;
+	char clear_screen[] = {0x1b, '[', 'H',
+			       0x1b, '[', 'J',
+			       0x0};
+	int fd;
+	int l;
+
+	fd = drm_open_any();
+	devid = intel_get_drm_devid(fd);
+
+	bufmgr = drm_intel_bufmgr_gem_init(fd, 4096);
+	drm_intel_bufmgr_gem_enable_reuse(bufmgr);
+	batch = intel_batchbuffer_alloc(bufmgr, devid);
+
+	if (!IS_GEN5(devid)) {
+		printf("This tool is only for Ironlake.\n");
+		abort();
+	}
+
+	for (;;) {
+		for (l = 0; l < STATS_CHECK_FREQUENCY; l++) {
+			printf("%s", clear_screen);
+
+			if (l % (STATS_CHECK_FREQUENCY / STATS_REPORT_FREQUENCY) == 0) {
+				if (have_totals) {
+					for (i = 0; i < COUNTER_COUNT; i++) {
+						printf("%s: %u\n", counter_name[i],
+						       totals[i]);
+						totals[i] = 0;
+					}
+				}
+			}
+
+			get_counters();
+			have_totals = 1;
+
+			usleep(1000000 / STATS_CHECK_FREQUENCY);
+		}
+	}
+
+	return 0;
+}
-- 
1.8.2