[Intel-gfx] [PATCH igt] igt: Add basic framework for GVT-g testing

[Chris Wilson]

On Tue, Jun 21, 2016 at 12:36:06PM +0100, Chris Wilson wrote:
> +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) {
> +				buf[0] = '1';
> +				buf[1] = '\n';
> +				write(fd, buf, 2);
> +				close(fd);
> +			}
> +			break;
> +		}
> +	}
> +	closedir(dir);
> +}
> +
> +static void unload_i915(void)
> +{
> +	unbind_fbcon();
> +	/* pkill alsact */
> +
> +	system("/sbin/modprobe -s -r i915");
> +}
> +
> +bool igt_gvt_load_module(void)
> +{
> +	if (is_gvt_enabled())
> +		return true;
> +
> +	unload_i915();
> +	system("/sbin/modprobe -s i915 enable_gvt=1");
> +
> +	return is_gvt_enabled();

Would it be safe to put igt_gvt_unload_module() into an exit handler?

> +}
> +
> +void igt_gvt_unload_module(void)
> +{
> +	if (!is_gvt_enabled())
> +		return;
> +
> +	unload_i915();
> +	system("/sbin/modprobe -s i915 enable_gvt=0");
> +
> +	igt_assert(!is_gvt_enabled());
> +}

-- 
Chris Wilson, Intel Open Source Technology Centre