[igt-dev] [PATCH v5 5/8] tests/fbdev: Add tests for write operations on framebuffer

[Thomas Zimmermann]

The write tests check the written buffer against the content of the mapped
framebuffer.

v4:
	* replace igt_require() by iqt_assert() in "write" (Petri)
	* add write test to CI
v3:
	* put igt_describe() before igt_subtest() (Petri)

Signed-off-by: Thomas Zimmermann <tzimmermann at suse.de>
---
 tests/fbdev.c                         | 20 ++++++++++++++++++++
 tests/intel-ci/fast-feedback.testlist |  1 +
 2 files changed, 21 insertions(+)

diff --git a/tests/fbdev.c b/tests/fbdev.c
index be9e95c1..23ff146c 100644
--- a/tests/fbdev.c
+++ b/tests/fbdev.c
@@ -135,6 +135,26 @@ static void framebuffer_tests(int fd)
 		igt_assert_f(pos, "found 0x55 at pos %zu, none expected\n", pos - buf);
 	}
 
+	igt_describe("Check write operations on framebuffer memory");
+	igt_subtest("write") {
+		ssize_t ret;
+		int cmp;
+
+		/* write 0 to framebuffer and compare */
+		memset(buf, 0, fix_info.smem_len);
+		ret = pwrite(fd, buf, fix_info.smem_len, 0);
+		igt_assert_f(ret == (ssize_t)fix_info.smem_len, "pwrite failed, ret=%zd\n", ret);
+		cmp = memcmp(map, buf, fix_info.smem_len);
+		igt_assert_f(!cmp, "write buffer differs from mapped framebuffer for 0\n");
+
+		/* write 0x55 to framebuffer and compare */
+		memset(buf, 0x55, fix_info.smem_len);
+		ret = pwrite(fd, buf, fix_info.smem_len, 0);
+		igt_assert_f(ret == (ssize_t)fix_info.smem_len, "pwrite failed, ret=%zd\n", ret);
+		cmp = memcmp(map, buf, fix_info.smem_len);
+		igt_assert_f(!cmp, "write buffer differs from mapped framebuffer for 0\n");
+	}
+
 	igt_fixture {
 		free(buf);
 		memset(map, 0, fix_info.smem_len); // don't leave garbage on the screen
diff --git a/tests/intel-ci/fast-feedback.testlist b/tests/intel-ci/fast-feedback.testlist
index 2f9148ab..66630e1d 100644
--- a/tests/intel-ci/fast-feedback.testlist
+++ b/tests/intel-ci/fast-feedback.testlist
@@ -5,6 +5,7 @@ igt at debugfs_test@read_all_entries
 igt at fbdev@info
 igt at fbdev@read
 igt at fbdev@unaligned-read
+igt at fbdev@write
 igt at gem_basic@bad-close
 igt at gem_basic@create-close
 igt at gem_basic@create-fd-close
-- 
2.29.2