overlay: Monitor interrupts

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

overlay/Makefile.am

@@ -15,6 +15,8 @@ intel_gpu_overlay_SOURCES = \
 	cpu-top.c \
 	debugfs.h \
 	debugfs.c \
+	gem-interrupts.h \
+	gem-interrupts.c \
 	gem-objects.h \
 	gem-objects.c \
 	gpu-top.h \

overlay/gem-interrupts.c

@@ -0,0 +1,81 @@
+/*
+ * Copyright © 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.
+ *
+ */
+
+#include <sys/stat.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <errno.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "gem-interrupts.h"
+#include "debugfs.h"
+
+int gem_interrupts_init(struct gem_interrupts *irqs)
+{
+	char buf[1024];
+	struct stat st;
+
+
+	memset(irqs, 0, sizeof(*irqs));
+
+	sprintf(buf, "%s/i915_gem_interrupt", debugfs_dri_path);
+	if (stat(buf, &st))
+		return irqs->error = errno;
+
+	return 0;
+}
+
+int gem_interrupts_update(struct gem_interrupts *irqs)
+{
+	char buf[8192], *b;
+	int fd, len;
+
+	if (irqs->error)
+		return irqs->error;
+
+	sprintf(buf, "%s/i915_gem_interrupt", debugfs_dri_path);
+	fd = open(buf, 0);
+	if (fd < 0)
+		return irqs->error = errno;
+	len = read(fd, buf, sizeof(buf)-1);
+	close(fd);
+
+	if (len < 0)
+		return irqs->error = errno;
+
+	buf[len] = '\0';
+
+	b = strstr(buf, "Interrupts received:");
+	if (b == NULL)
+		return irqs->error = ENOENT;
+
+	fd = irqs->last_count == 0;
+	irqs->last_count = irqs->count;
+	irqs->count = strtoull(b + sizeof("Interrupts received:"), 0, 0);
+	irqs->delta = irqs->count - irqs->last_count;
+
+	return fd ? EAGAIN : 0;
+}

overlay/gem-interrupts.h

@@ -0,0 +1,38 @@
+/*
+ * Copyright © 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.
+ *
+ */
+
+#ifndef GEM_INTERRUPTS_H
+#define GEM_INTERRUPTS_H
+
+#include <stdint.h>
+
+struct gem_interrupts {
+	long unsigned last_count, count, delta;
+	int error;
+};
+
+int gem_interrupts_init(struct gem_interrupts *irqs);
+int gem_interrupts_update(struct gem_interrupts *irqs);
+
+#endif /* GEM_INTERRUPTS_H */

overlay/overlay.c

@@ -40,6 +40,7 @@
 #include "config.h"
 #include "cpu-top.h"
 #include "debugfs.h"
+#include "gem-interrupts.h"
 #include "gem-objects.h"
 #include "gpu-freq.h"
 #include "gpu-top.h"
@@ -101,6 +102,7 @@ struct overlay_gpu_perf {
 struct overlay_gpu_freq {
 	struct gpu_freq gpu_freq;
 	struct rc6 rc6;
+	struct gem_interrupts irqs;
 	struct power power;
 	struct chart current;
 	struct chart request;
@@ -489,6 +491,7 @@ static void init_gpu_freq(struct overlay_context *ctx,
 	}
 
 	rc6_init(&gf->rc6);
+	gem_interrupts_init(&gf->irqs);
 }
 
 static void show_gpu_freq(struct overlay_context *ctx, struct overlay_gpu_freq *gf)
@@ -499,6 +502,7 @@ static void show_gpu_freq(struct overlay_context *ctx, struct overlay_gpu_freq *
 	int has_freq = gpu_freq_update(&gf->gpu_freq) == 0;
 	int has_rc6 = rc6_update(&gf->rc6) == 0;
 	int has_power = power_update(&gf->power) == 0;
+	int has_irqs = gem_interrupts_update(&gf->irqs) == 0;
 	cairo_pattern_t *linear;
 
 	cairo_rectangle(ctx->cr, 12-.5, ctx->height/2+6-.5, ctx->width/2-18+1, ctx->height/2-18+1);
@@ -545,12 +549,12 @@ static void show_gpu_freq(struct overlay_context *ctx, struct overlay_gpu_freq *
 		y2 += 14;
 		y2 += 14;
 	}
-	if (has_rc6) {
+	if (has_rc6)
 		y2 += 14;
-	}
-	if (has_power) {
+	if (has_power)
+		y2 += 14;
+	if (has_irqs)
 		y2 += 14;
-	}
 	y1 += -12 - 2;
 	y2 += -14 + 4;
 
@@ -612,6 +616,13 @@ static void show_gpu_freq(struct overlay_context *ctx, struct overlay_gpu_freq *
 		cairo_show_text(ctx->cr, buf);
 		y += 14;
 	}
+
+	if (has_irqs) {
+		sprintf(buf, "Interrupts: %llu", (long long unsigned)gf->irqs.delta);
+		cairo_move_to(ctx->cr, 12, y);
+		cairo_show_text(ctx->cr, buf);
+		y += 14;
+	}
 }
 
 static void init_gem_objects(struct overlay_context *ctx,