overlay: Monitor interrupts

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

1 files changed, 81 insertions, 0 deletions

diff --git a/overlay/gem-interrupts.c b/overlay/gem-interrupts.c
new file mode 100644
index 00000000..7377ee71
--- /dev/null
+++ b/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;
+}