reg_read: basic register read ioctl test

This will need to get modified when the ioctl expands, and so is only
here for reference/to make Daniel happy.

Signed-off-by: Ben Widawsky <ben@bwidawsk.net>

tests/Makefile.am

@@ -69,6 +69,7 @@ TESTS_progs = \
 	gem_ctx_exec \
 	gem_ctx_bad_exec \
 	gem_ctx_basic \
+	drm_reg_read \
 	$(NULL)
 
 # IMPORTANT: The ZZ_ tests need to be run last!

tests/drm_reg_read.c

@@ -0,0 +1,89 @@
+/*
+ * Copyright © 2012 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.
+ *
+ * Authors:
+ *    Ben Widawsky <ben@bwidawsk.net>
+ *
+ */
+
+#include <stdio.h>
+#include <string.h>
+#include "i915_drm.h"
+#include "drmtest.h"
+
+struct local_drm_i915_reg_read {
+	__u64 offset;
+	__u64 val; /* Return value */
+};
+
+#define REG_READ_IOCTL DRM_IOWR(DRM_COMMAND_BASE + 0x31, struct local_drm_i915_reg_read)
+
+static void handle_bad(int ret, int lerrno, int expected, const char *desc)
+{
+	if (ret != 0 && lerrno != expected) {
+		fprintf(stderr, "%s - errno was %d, but should have been %d\n",
+				desc, lerrno, expected);
+		exit(EXIT_FAILURE);
+	} else if (ret == 0) {
+		fprintf(stderr, "%s - Command succeeded, but should have failed\n",
+			desc);
+		exit(EXIT_FAILURE);
+	}
+}
+
+int main(int argc, char *argv[])
+{
+	struct local_drm_i915_reg_read read;
+	int ret, fd;
+	__u64 val;
+
+	read.offset = 0x2358;
+
+	fd = drm_open_any();
+
+	ret = drmIoctl(fd, REG_READ_IOCTL, &read);
+	if (ret) {
+		perror("positive test case failed\n");
+		exit(EXIT_FAILURE);
+	}
+	val = read.val;
+	ret = drmIoctl(fd, REG_READ_IOCTL, &read);
+	if (ret) {
+		perror("positive test case 2 failed\n");
+		exit(EXIT_FAILURE);
+	}
+
+	if (val == read.val) {
+		fprintf(stderr, "Timer isn't moving, probably busted\n");
+		exit(EXIT_FAILURE);
+	}
+
+
+	/* bad reg */
+	read.offset = 0x12345678;
+	ret = drmIoctl(fd, REG_READ_IOCTL, &read);
+	handle_bad(ret, errno, EINVAL, "bad register");
+
+	close(fd);
+
+	exit(EXIT_SUCCESS);
+}