tests: Add exercise for fbdev

I broke fb_mmap() proving that we need a test in CI!

References: https://bugs.freedesktop.org/show_bug.cgi?id=112256
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>

1 files changed, 81 insertions, 0 deletions

diff --git a/tests/fbdev.c b/tests/fbdev.c
new file mode 100644
index 00000000..fe320b14
--- /dev/null
+++ b/tests/fbdev.c
@@ -0,0 +1,81 @@
+/*
+ * Copyright © 2019 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 "config.h"
+
+#include "igt.h"
+
+#include <fcntl.h>
+#include <string.h>
+#include <sys/ioctl.h>
+#include <sys/mman.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+#include <linux/fb.h>
+
+#include "igt.h"
+
+igt_main
+{
+	struct fb_var_screeninfo var_info;
+	struct fb_fix_screeninfo fix_info;
+	int fd = -1;
+
+	igt_fixture {
+		fd = open("/dev/fb0", O_RDWR);
+		igt_require_f(fd != -1, "/dev/fb0\n");
+
+		igt_require(ioctl(fd, FBIOGET_VSCREENINFO, &var_info) == 0);
+		igt_require(ioctl(fd, FBIOGET_FSCREENINFO, &fix_info) == 0);
+	}
+
+	igt_subtest("info") {
+		unsigned long size;
+
+		size = var_info.yres * fix_info.line_length;
+		igt_assert_f(size <= fix_info.smem_len,
+			     "screen size (%d x %d) of pitch %d does not fit within mappable area of size %u\n",
+			     var_info.xres, var_info.yres,
+			     fix_info.line_length,
+			     fix_info.smem_len);
+	}
+
+	igt_subtest("mmap") {
+		void *map;
+
+		igt_require(fix_info.smem_len);
+
+		map = mmap(NULL, fix_info.smem_len,
+			   PROT_WRITE, MAP_SHARED, fd, 0);
+		igt_assert(map != MAP_FAILED);
+
+		memset(map, 0, fix_info.smem_len);
+		munmap(map, fix_info.smem_len);
+	}
+
+	igt_fixture {
+		close(fd);
+	}
+}