overlay: Add graph for GPU power consumption

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

overlay/Makefile.am

@@ -25,6 +25,8 @@ intel_gpu_overlay_SOURCES = \
 	gpu-freq.c \
 	igfx.h \
 	igfx.c \
+	power.h \
+	power.c \
 	rc6.h \
 	rc6.c \
 	$(NULL)

overlay/chart.c

@@ -108,6 +108,8 @@ static void chart_update_range(struct chart *chart)
 		else if (chart->samples[n] > chart->range[1])
 			chart->range[1] = chart->samples[n];
 	}
+	if (strcmp(chart->name, "power") == 0)
+	printf ("chart_update_range [%f, %f]\n", chart->range[0], chart->range[1]);
 }
 
 static double value_at(struct chart *chart, int n)

overlay/gpu-freq.c

@@ -15,37 +15,40 @@ int gpu_freq_init(struct gpu_freq *gf)
 
 	fd = open("/sys/kernel/debug/dri/0/i915_cur_delayinfo", 0);
 	if (fd < 0)
-		return errno;
+		return gf->error = errno;
 
 	len = read(fd, buf, sizeof(buf)-1);
 	close(fd);
 	if (len < 0)
-		return EIO;
+		goto err;
 
 	buf[len] = '\0';
 
 	s = strstr(buf, "(RPN)");
 	if (s == NULL)
-		return EIO;
+		goto err;
 	sscanf(s, "(RPN) frequency: %dMHz", &gf->rpn);
 
 	s = strstr(s, "(RP1)");
 	if (s == NULL)
-		return EIO;
+		goto err;
 	sscanf(s, "(RP1) frequency: %dMHz", &gf->rp1);
 
 	s = strstr(s, "(RP0)");
 	if (s == NULL)
-		return EIO;
+		goto err;
 	sscanf(s, "(RP0) frequency: %dMHz", &gf->rp0);
 
 	s = strstr(s, "Max");
 	if (s == NULL)
-		return EIO;
+		goto err;
 	sscanf(s, "Max overclocked frequency: %dMHz", &gf->max);
 	gf->min = gf->rpn;
 
 	return 0;
+
+err:
+	return gf->error = EIO;
 }
 
 int gpu_freq_update(struct gpu_freq *gf)
@@ -53,14 +56,17 @@ int gpu_freq_update(struct gpu_freq *gf)
 	char buf[4096], *s;
 	int fd, len = -1;
 
+	if (gf->error)
+		return gf->error;
+
 	fd = open("/sys/kernel/debug/dri/0/i915_cur_delayinfo", 0);
 	if (fd < 0)
-		return errno;
+		return gf->error = errno;
 
 	len = read(fd, buf, sizeof(buf)-1);
 	close(fd);
 	if (len < 0)
-		return EIO;
+		return gf->error = EIO;
 
 	buf[len] = '\0';
 

overlay/gpu-freq.h

@@ -3,6 +3,7 @@ struct gpu_freq {
 	int rpn, rp1, rp0;
 	int request;
 	int current;
+	int error;
 };
 
 int gpu_freq_init(struct gpu_freq *gf);

overlay/overlay.c

@@ -17,6 +17,7 @@
 #include "gpu-freq.h"
 #include "gpu-top.h"
 #include "gpu-perf.h"
+#include "power.h"
 #include "rc6.h"
 
 const cairo_user_data_key_t overlay_key;
@@ -73,9 +74,11 @@ struct overlay_gpu_perf {
 struct overlay_gpu_freq {
 	struct gpu_freq gpu_freq;
 	struct rc6 rc6;
+	struct power power;
 	struct chart current;
 	struct chart request;
-	int error;
+	struct chart power_chart;
+	double power_range[2];
 };
 
 struct overlay_gem_objects {
@@ -387,27 +390,34 @@ static void show_gpu_perf(struct overlay_context *ctx, struct overlay_gpu_perf *
 static void init_gpu_freq(struct overlay_context *ctx,
 			  struct overlay_gpu_freq *gf)
 {
-	gf->error = gpu_freq_init(&gf->gpu_freq);
-	if (gf->error)
-		return;
+	if (gpu_freq_init(&gf->gpu_freq) == 0) {
+		chart_init(&gf->current, "current", 120);
+		chart_set_position(&gf->current, 12, ctx->height/2 + 6);
+		chart_set_size(&gf->current, ctx->width/2 - 18, ctx->height/2 - 18);
+		chart_set_stroke_rgba(&gf->current, 0.75, 0.25, 0.50, 1.);
+		chart_set_mode(&gf->current, CHART_STROKE);
+		chart_set_smooth(&gf->current, CHART_LINE);
+		chart_set_range(&gf->current, 0, gf->gpu_freq.max);
+
+		chart_init(&gf->request, "request", 120);
+		chart_set_position(&gf->request, 12, ctx->height/2 + 6);
+		chart_set_size(&gf->request, ctx->width/2 - 18, ctx->height/2 - 18);
+		chart_set_fill_rgba(&gf->request, 0.25, 0.25, 0.50, 1.);
+		chart_set_mode(&gf->request, CHART_FILL);
+		chart_set_smooth(&gf->request, CHART_LINE);
+		chart_set_range(&gf->request, 0, gf->gpu_freq.max);
+	}
+
+	if (power_init(&gf->power) == 0) {
+		chart_init(&gf->power_chart, "power", 120);
+		chart_set_position(&gf->power_chart, 12, ctx->height/2 + 6);
+		chart_set_size(&gf->power_chart, ctx->width/2 - 18, ctx->height/2 - 18);
+		chart_set_stroke_rgba(&gf->power_chart, 0.45, 0.55, 0.45, 1.);
+		memset(gf->power_range, 0, sizeof(gf->power_range));
+	}
 
 	rc6_init(&gf->rc6);
 
-	chart_init(&gf->current, "current", 120);
-	chart_set_position(&gf->current, 12, ctx->height/2 + 6);
-	chart_set_size(&gf->current, ctx->width/2 - 18, ctx->height/2 - 18);
-	chart_set_stroke_rgba(&gf->current, 0.75, 0.25, 0.50, 1.);
-	chart_set_mode(&gf->current, CHART_STROKE);
-	chart_set_smooth(&gf->current, CHART_LINE);
-	chart_set_range(&gf->current, 0, gf->gpu_freq.max);
-
-	chart_init(&gf->request, "request", 120);
-	chart_set_position(&gf->request, 12, ctx->height/2 + 6);
-	chart_set_size(&gf->request, ctx->width/2 - 18, ctx->height/2 - 18);
-	chart_set_fill_rgba(&gf->request, 0.25, 0.25, 0.50, 1.);
-	chart_set_mode(&gf->request, CHART_FILL);
-	chart_set_smooth(&gf->request, CHART_LINE);
-	chart_set_range(&gf->request, 0, gf->gpu_freq.max);
 }
 
 static void show_gpu_freq(struct overlay_context *ctx, struct overlay_gpu_freq *gf)
@@ -415,32 +425,30 @@ static void show_gpu_freq(struct overlay_context *ctx, struct overlay_gpu_freq *
 	char buf[160];
 	int y, len;
 
-	if (gf->error == 0)
-		gf->error = gpu_freq_update(&gf->gpu_freq);
-	if (gf->error)
-		return;
-
-	if (gf->gpu_freq.current)
-		chart_add_sample(&gf->current, gf->gpu_freq.current);
-	if (gf->gpu_freq.request)
-		chart_add_sample(&gf->request, gf->gpu_freq.request);
-
-	chart_draw(&gf->request, ctx->cr);
-	chart_draw(&gf->current, ctx->cr);
-
 	y = ctx->height/2 + 6 + 12 - 2;
-	len = sprintf(buf, "Frequency: %dMHz", gf->gpu_freq.current);
-	if (gf->gpu_freq.request)
-		sprintf(buf + len, " (requested %dMHz)", gf->gpu_freq.request);
-	cairo_set_source_rgba(ctx->cr, 1, 1, 1, 1);
-	cairo_move_to(ctx->cr, 12, y);
-	cairo_show_text(ctx->cr, buf);
-	y += 14;
 
-	sprintf(buf, "min: %dMHz, max: %dMHz", gf->gpu_freq.min, gf->gpu_freq.max);
-	cairo_move_to(ctx->cr, 12, y);
-	cairo_show_text(ctx->cr, buf);
-	y += 14;
+	if (gpu_freq_update(&gf->gpu_freq) == 0) {
+		if (gf->gpu_freq.current)
+			chart_add_sample(&gf->current, gf->gpu_freq.current);
+		if (gf->gpu_freq.request)
+			chart_add_sample(&gf->request, gf->gpu_freq.request);
+
+		chart_draw(&gf->request, ctx->cr);
+		chart_draw(&gf->current, ctx->cr);
+
+		len = sprintf(buf, "Frequency: %dMHz", gf->gpu_freq.current);
+		if (gf->gpu_freq.request)
+			sprintf(buf + len, " (requested %dMHz)", gf->gpu_freq.request);
+		cairo_set_source_rgba(ctx->cr, 1, 1, 1, 1);
+		cairo_move_to(ctx->cr, 12, y);
+		cairo_show_text(ctx->cr, buf);
+		y += 14;
+
+		sprintf(buf, "min: %dMHz, max: %dMHz", gf->gpu_freq.min, gf->gpu_freq.max);
+		cairo_move_to(ctx->cr, 12, y);
+		cairo_show_text(ctx->cr, buf);
+		y += 14;
+	}
 
 	if (rc6_update(&gf->rc6) == 0) {
 		sprintf(buf, "RC6: %d%%", gf->rc6.rc6_combined);
@@ -453,6 +461,21 @@ static void show_gpu_freq(struct overlay_context *ctx, struct overlay_gpu_freq *
 		}
 		y += 14;
 	}
+
+	if (power_update(&gf->power) == 0) {
+		chart_add_sample(&gf->power_chart, gf->power.power_mW);
+		if (gf->power.new_sample) {
+			chart_get_range(&gf->power_chart, gf->power_range);
+			chart_set_range(&gf->power_chart, gf->power_range[0], gf->power_range[1]);
+			gf->power.new_sample = 0;
+		}
+		chart_draw(&gf->power_chart, ctx->cr);
+
+		sprintf(buf, "Power: %llumW", (long long unsigned)gf->power.power_mW);
+		cairo_move_to(ctx->cr, 12, y);
+		cairo_show_text(ctx->cr, buf);
+		y += 14;
+	}
 }
 
 static void init_gem_objects(struct overlay_context *ctx,

overlay/power.c

@@ -0,0 +1,86 @@
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <time.h>
+#include <errno.h>
+
+#include "power.h"
+
+/* XXX Is this exposed through RAPL? */
+
+int power_init(struct power *power)
+{
+	char buf[4096];
+	int fd, len;
+
+	memset(power, 0, sizeof(*power));
+
+	fd = open("/sys/kernel/debug/dri/0/i915_energy_uJ", 0);
+	if (fd < 0)
+		return power->error = errno;
+
+	len = read(fd, buf, sizeof(buf));
+	close(fd);
+
+	if (len < 0)
+		return power->error = errno;
+
+	return 0;
+}
+
+static uint64_t file_to_u64(const char *path)
+{
+	char buf[4096];
+	int fd, len;
+
+	fd = open(path, 0);
+	if (fd < 0)
+		return 0;
+
+	len = read(fd, buf, sizeof(buf)-1);
+	close(fd);
+
+	if (len < 0)
+		return 0;
+
+	buf[len] = '\0';
+
+	return strtoull(buf, 0, 0);
+}
+
+static uint64_t clock_ms_to_u64(void)
+{
+	struct timespec tv;
+
+	if (clock_gettime(CLOCK_MONOTONIC, &tv) < 0)
+		return 0;
+
+	return (uint64_t)tv.tv_sec * 1000 + tv.tv_nsec / 10000000;
+}
+
+int power_update(struct power *power)
+{
+	struct power_stat *s = &power->stat[power->count++&1];
+	struct power_stat *d = &power->stat[power->count&1];
+	uint64_t d_time;
+
+	if (power->error)
+		return power->error;
+
+	s->energy = file_to_u64("/sys/kernel/debug/dri/0/i915_energy_uJ");
+	s->timestamp = clock_ms_to_u64();
+	if (power->count == 1)
+		return EAGAIN;
+
+	d_time = s->timestamp - d->timestamp;
+	if (d_time < 1200) { /* HW sample rate seems to be stable ~1Hz */
+		power->count--;
+		return power->count <= 1 ? EAGAIN : 0;
+	}
+
+	power->power_mW = (s->energy - d->energy) / d_time;
+	power->new_sample = 1;
+	return 0;
+}

overlay/power.h

@@ -0,0 +1,17 @@
+#include <stdint.h>
+
+struct power {
+	struct power_stat {
+		uint64_t energy;
+		uint64_t timestamp;
+	} stat[2];
+
+	int error;
+	int count;
+	int new_sample;
+
+	uint64_t power_mW;
+};
+
+int power_init(struct power *power);
+int power_update(struct power *power);