intel_gpu_top: support non-interactive mode

This patch adds support for non-interactive mode, invoked by running with
'-o output' switch. In this case, no interactive output is being
performed, but the execution statistics are being saved into the output
file.

The output file is generated in both human and gnuplot-readable format.

Unlike interactive mode, where non-supported pipes and non-active
registers are skipped, the content of such pipes and registers is recorded
into the log file to simplify parsing and standardize the list of columns.

Also, unlike interactive mode, the registers are not sorted according to
the usage - this way, their variation over time can be analysed offline.

Signed-off-by: Eugeni Dodonov <eugeni.dodonov@intel.com>

2 files changed, 112 insertions, 41 deletions

diff --git a/man/intel_gpu_top.1 b/man/intel_gpu_top.1
index 2cbbec98..bca83f0d 100644
--- a/man/intel_gpu_top.1
+++ b/man/intel_gpu_top.1
@@ -16,6 +16,9 @@ privilege to map the graphics device.
 .B -s [samples per second]
 number of samples to acquire per second
 .TP
+.B -o [output file]
+run non-interactively and collect usage statistics to [file]
+.TP
 .B -h
 show usage notes
 .PP
diff --git a/tools/intel_gpu_top.c b/tools/intel_gpu_top.c
index 26aa1d35..f7ea6dba 100644
--- a/tools/intel_gpu_top.c
+++ b/tools/intel_gpu_top.c
@@ -373,24 +373,39 @@ static void ring_sample(struct ring *ring)
 	ring->full += full;
 }
 
+static void ring_print_header(FILE *out, struct ring *ring)
+{
+    fprintf(out, "%.6s%%\tops\t",
+            ring->name
+          );
+}
+
 static void ring_print(struct ring *ring, unsigned long samples_per_sec,
 		FILE *output)
 {
 	int samples_to_percent_ratio, percent, len;
 
-	if (!ring->size)
-		return;
-
 	/* Calculate current value of samples_to_percent_ratio */
 	samples_to_percent_ratio = (ring->idle * 100) / samples_per_sec;
 	percent = 100 - samples_to_percent_ratio;
-	len = fprintf(output, "%25s busy: %3d%%: ", ring->name, percent);
-	print_percentage_bar (percent, len);
-	fprintf(output, "%24s space: %d/%d (%d%%)\n",
-	       ring->name,
-	       (int)(ring->full / samples_per_sec),
-	       ring->size,
-	       (int)((ring->full / samples_to_percent_ratio) / ring->size));
+
+	if (output == stdout) {
+		if (!ring->size)
+			return;
+
+		len = fprintf(output, "%25s busy: %3d%%: ", ring->name, percent);
+		print_percentage_bar (percent, len);
+		fprintf(output, "%24s space: %d/%d (%d%%)\n",
+			   ring->name,
+			   (int)(ring->full / samples_per_sec),
+			   ring->size,
+			   (int)((ring->full / samples_to_percent_ratio) / ring->size));
+	} else {
+		fprintf(output, "%3d\t%d\t",
+			   (ring->size) ? 100 - ring->idle / samples_to_percent_ratio : -1,
+			   (ring->size) ? (int)(ring->full / samples_per_sec) : -1
+			   );
+	}
 }
 
 static void
@@ -402,6 +417,7 @@ usage(const char *appname)
 			"\n"
 			"The following parameters apply:\n"
 			"[-s <samples>]       samples per seconds (default %d)\n"
+            "[-o <file>]          output to file (default to stdio)\n"
 			"[-h]                 show this help screen\n"
 			"\n",
 			appname,
@@ -429,9 +445,11 @@ int main(int argc, char **argv)
 	int i, ch;
 	int samples_per_sec = SAMPLES_PER_SEC;
 	FILE *output = stdout;
+	double elapsed_time=0;
+	int print_headers=1;
 
 	/* Parse options? */
-	while ((ch = getopt(argc, argv, "s:h")) != -1)
+	while ((ch = getopt(argc, argv, "s:o:h")) != -1)
 	{
 		switch (ch) {
 		case 's': samples_per_sec = atoi(optarg);
@@ -440,6 +458,13 @@ int main(int argc, char **argv)
 				exit(1);
 			}
 			break;
+		case 'o': output = fopen(optarg, "w");
+			if (!output)
+			{
+				perror("fopen");
+				exit(1);
+			}
+			break;
 		case 'h':
 			usage(argv[0]);
 			exit(0);
@@ -491,7 +516,7 @@ int main(int argc, char **argv)
 
 	for (;;) {
 		int j;
-		unsigned long long t1, ti, tf;
+		unsigned long long t1, ti, tf, t2;
 		unsigned long long def_sleep = 1000000 / samples_per_sec;
 		unsigned long long last_samples_per_sec = samples_per_sec;
 		char clear_screen[] = {0x1b, '[', 'H',
@@ -562,39 +587,82 @@ int main(int argc, char **argv)
 		if (max_lines >= num_instdone_bits)
 			max_lines = num_instdone_bits;
 
-		fprintf(output, "%s", clear_screen);
-
-		print_clock_info(pci_dev);
-
-		ring_print(&render_ring, last_samples_per_sec, output);
-		ring_print(&bsd_ring, last_samples_per_sec, output);
-		ring_print(&bsd6_ring, last_samples_per_sec, output);
-		ring_print(&blt_ring, last_samples_per_sec, output);
-
-		fprintf(output, "\n%30s  %s\n", "task", "percent busy");
-		for (i = 0; i < max_lines; i++) {
-			if (top_bits_sorted[i]->count > 0) {
-				percent = (top_bits_sorted[i]->count * 100) /
-					last_samples_per_sec;
-				len = fprintf(output, "%30s: %3d%%: ",
-					     top_bits_sorted[i]->bit->name,
-					     percent);
-				print_percentage_bar (percent, len);
-			} else {
-				fprintf(output, "%*s", PERCENTAGE_BAR_END, "");
+        t2 = gettime();
+        elapsed_time += (t2 - t1) / 1000000.0;
+
+		if (output == stdout) {
+			fprintf(output, "%s", clear_screen);
+			print_clock_info(pci_dev);
+
+			ring_print(&render_ring, last_samples_per_sec, output);
+			ring_print(&bsd_ring, last_samples_per_sec, output);
+			ring_print(&bsd6_ring, last_samples_per_sec, output);
+			ring_print(&blt_ring, last_samples_per_sec, output);
+
+			fprintf(output, "\n%30s  %s\n", "task", "percent busy");
+			for (i = 0; i < max_lines; i++) {
+				if (top_bits_sorted[i]->count > 0) {
+					percent = (top_bits_sorted[i]->count * 100) /
+						last_samples_per_sec;
+					len = fprintf(output, "%30s: %3d%%: ",
+							 top_bits_sorted[i]->bit->name,
+							 percent);
+					print_percentage_bar (percent, len);
+				} else {
+					fprintf(output, "%*s", PERCENTAGE_BAR_END, "");
+				}
+
+				if (i < STATS_COUNT && HAS_STATS_REGS(devid)) {
+					fprintf(output, "%13s: %llu (%lld/sec)",
+						   stats_reg_names[i],
+						   stats[i],
+						   stats[i] - last_stats[i]);
+					last_stats[i] = stats[i];
+				} else {
+					if (!top_bits_sorted[i]->count)
+						break;
+				}
+				fprintf(output, "\n");
+			}
+		} else {
+			/* Print headers for columns at first run */
+			if (print_headers) {
+				fprintf(output, "# time\t");
+				ring_print_header(output, &render_ring);
+				ring_print_header(output, &bsd_ring);
+				ring_print_header(output, &bsd6_ring);
+				ring_print_header(output, &blt_ring);
+				for (i = 0; i < MAX_NUM_TOP_BITS; i++) {
+					if (i < STATS_COUNT && HAS_STATS_REGS(devid)) {
+						fprintf(output, "%.6s\t",
+							   stats_reg_names[i]
+							   );
+					}
+					if (!top_bits[i].count)
+						continue;
+				}
+				fprintf(output, "\n");
+				print_headers = 0;
 			}
 
-			if (i < STATS_COUNT && HAS_STATS_REGS(devid)) {
-				fprintf(output, "%13s: %llu (%lld/sec)",
-				       stats_reg_names[i],
-				       stats[i],
-				       stats[i] - last_stats[i]);
-				last_stats[i] = stats[i];
-			} else {
-				if (!top_bits_sorted[i]->count)
-					break;
+			/* Print statistics */
+			fprintf(output, "%.2f\t", elapsed_time);
+			ring_print(&render_ring, last_samples_per_sec, output);
+			ring_print(&bsd_ring, last_samples_per_sec, output);
+			ring_print(&bsd6_ring, last_samples_per_sec, output);
+			ring_print(&blt_ring, last_samples_per_sec, output);
+
+			for (i = 0; i < MAX_NUM_TOP_BITS; i++) {
+				if (i < STATS_COUNT && HAS_STATS_REGS(devid)) {
+					fprintf(output, "%lu\t",
+						   stats[i] - last_stats[i]);
+					last_stats[i] = stats[i];
+				}
+					if (!top_bits[i].count)
+						continue;
 			}
 			fprintf(output, "\n");
+			fflush(output);
 		}
 
 		for (i = 0; i < num_instdone_bits; i++) {