igt: Add basic framework for GVT-g testing

We don't do anything yet other than try to load the module. Initial
sanity checks to come.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Zhi Wang <zhi.a.wang@intel.com>

1 files changed, 117 insertions, 0 deletions

diff --git a/lib/igt_gvt.c b/lib/igt_gvt.c
new file mode 100644
index 00000000..0f332d1c
--- /dev/null
+++ b/lib/igt_gvt.c
@@ -0,0 +1,117 @@
+/*
+ * Copyright © 2016 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 "igt.h"
+#include "igt_gvt.h"
+
+#include <dirent.h>
+#include <unistd.h>
+#include <fcntl.h>
+
+static bool is_gvt_enabled(void)
+{
+	FILE *file;
+	int value;
+	bool enabled = false;
+
+	file = fopen("/sys/module/i915/parameters/enable_gvt", "r");
+	if (!file)
+		return false;
+
+	if (fscanf(file, "%d", &value) == 1)
+		enabled = value;
+	fclose(file);
+
+	errno = 0;
+	return enabled;
+}
+
+static void unbind_fbcon(void)
+{
+	char buf[128];
+	const char *path = "/sys/class/vtconsole";
+	DIR *dir;
+	struct dirent *vtcon;
+
+	dir = opendir(path);
+	if (!dir)
+		return;
+
+	while ((vtcon = readdir(dir))) {
+		int fd, len;
+
+		if (strncmp(vtcon->d_name, "vtcon", 5))
+			continue;
+
+		sprintf(buf, "%s/%s/name", path, vtcon->d_name);
+		fd = open(buf, O_RDONLY);
+		if (fd < 0)
+			continue;
+
+		len = read(fd, buf, sizeof(buf) - 1);
+		close(fd);
+		if (len >= 0)
+			buf[len] = '\0';
+
+		if (strstr(buf, "frame buffer device")) {
+			sprintf(buf, "%s/%s/bind", path, vtcon->d_name);
+			fd = open(buf, O_WRONLY);
+			if (fd != -1) {
+				igt_ignore_warn(write(fd, "1\n", 2));
+				close(fd);
+			}
+			break;
+		}
+	}
+	closedir(dir);
+}
+
+static void unload_i915(void)
+{
+	unbind_fbcon();
+	/* pkill alsact */
+
+	igt_ignore_warn(system("/sbin/modprobe -s -r i915"));
+}
+
+bool igt_gvt_load_module(void)
+{
+	if (is_gvt_enabled())
+		return true;
+
+	unload_i915();
+	igt_ignore_warn(system("/sbin/modprobe -s i915 enable_gvt=1"));
+
+	return is_gvt_enabled();
+}
+
+void igt_gvt_unload_module(void)
+{
+	if (!is_gvt_enabled())
+		return;
+
+	unload_i915();
+	igt_ignore_warn(system("/sbin/modprobe -s i915 enable_gvt=0"));
+
+	igt_assert(!is_gvt_enabled());
+}