tests/prime_rw: Add basic tests for reading/writing to a dmabuf

The idea is to implement read(dmabuf) and write(dambuf) so provide some
tests.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

2 files changed, 180 insertions, 0 deletions

diff --git a/tests/Makefile.sources b/tests/Makefile.sources
index bb013c78..7a99cafc 100644
--- a/tests/Makefile.sources
+++ b/tests/Makefile.sources
@@ -225,6 +225,7 @@ TESTS_progs = \
 	prime_mmap \
 	prime_mmap_coherency \
 	prime_mmap_kms \
+	prime_rw \
 	prime_self_import \
 	prime_udl \
 	prime_vgem \
diff --git a/tests/prime_rw.c b/tests/prime_rw.c
new file mode 100644
index 00000000..65abec5d
--- /dev/null
+++ b/tests/prime_rw.c
@@ -0,0 +1,179 @@
+/*
+ * Copyright © 2017 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.
+ */
+
+/*
+ * Testcase: Check whether read()/write()ing dma-buf works
+ */
+#define _GNU_SOURCE
+#include <unistd.h>
+#include <fcntl.h>
+#include <errno.h>
+
+#include "drmtest.h"
+#include "ioctl_wrappers.h"
+
+static int create_dmabuf(int fd, int size)
+{
+	uint32_t handle;
+	int dmabuf;
+
+	handle = gem_create(fd, size);
+	dmabuf = prime_handle_to_fd_for_mmap(fd, handle);
+	gem_close(fd, handle);
+
+	return dmabuf;
+}
+
+static bool has_dma_buf_read(int fd)
+{
+	int dmabuf;
+	int ret;
+
+	dmabuf = create_dmabuf(fd, 4096);
+	ret = read(dmabuf, NULL, 0);
+	close(dmabuf);
+
+	errno = 0;
+	return ret == 0;
+}
+
+static bool has_dma_buf_write(int fd)
+{
+	int dmabuf;
+	int ret;
+
+	dmabuf = create_dmabuf(fd, 4096);
+	ret = write(dmabuf, NULL, 0);
+	close(dmabuf);
+
+	errno = 0;
+	return ret == 0;
+}
+
+static void test_read(int fd)
+{
+	uint32_t buf[4096];
+	uint32_t *ptr;
+	int i, len, offset;
+	int dmabuf;
+
+	dmabuf = create_dmabuf(fd, sizeof(buf));
+	igt_assert(dmabuf != -1);
+
+	ptr = mmap(NULL, sizeof(buf), PROT_WRITE, MAP_SHARED, dmabuf, 0);
+	igt_assert(ptr != MAP_FAILED);
+
+	prime_sync_start(dmabuf, true);
+	for (i = 0; i < ARRAY_SIZE(buf); i++)
+		ptr[i] = i;
+	prime_sync_end(dmabuf, true);
+
+	munmap(ptr, sizeof(buf));
+
+	prime_sync_start(dmabuf, false);
+	for (len = 1; len <= 4096; len <<= 1) {
+		const int sz = len * sizeof(buf[0]);
+
+		offset = len/2;
+		lseek(dmabuf, offset * sizeof(buf[0]), SEEK_SET);
+		for (; offset + len <= 4096; offset += len) {
+			igt_assert_eq(read(dmabuf, buf, sz), sz);
+			for (i = 0; i < len; i++)
+				igt_assert_eq(buf[i], offset + i);
+		}
+		igt_assert_eq(read(dmabuf, buf, sz),
+			      (4096 - offset) * sizeof(buf[0]));
+		igt_assert_eq(read(dmabuf, buf, sz), 0);
+	}
+	prime_sync_end(dmabuf, false);
+
+	close(dmabuf);
+}
+
+static void test_write(int fd)
+{
+	uint32_t buf[4096];
+	uint32_t *ptr;
+	int i, len, offset;
+	int dmabuf;
+
+	dmabuf = create_dmabuf(fd, sizeof(buf));
+	igt_assert(dmabuf != -1);
+
+	for (i = 0; i < ARRAY_SIZE(buf); i++)
+		buf[i] = i;
+
+	ptr = mmap(NULL, sizeof(buf), PROT_READ, MAP_SHARED, dmabuf, 0);
+	igt_assert(ptr != MAP_FAILED);
+
+	prime_sync_start(dmabuf, true);
+	for (len = 1; len <= 4096; len <<= 1) {
+		const int sz = len * sizeof(buf[0]);
+
+		offset = len/2;
+		lseek(dmabuf, offset * sizeof(buf[0]), SEEK_SET);
+		for (; offset + len <= 4096; offset += len) {
+			igt_assert_eq(write(dmabuf, buf, sz), sz);
+			for (i = 0; i < len; i++)
+				igt_assert_eq(ptr[i + offset], i);
+		}
+		igt_assert_eq(write(dmabuf, buf, sz),
+			      (4096 - offset) * sizeof(buf[0]));
+		igt_assert_eq(write(dmabuf, buf, sz), 0);
+	}
+	prime_sync_end(dmabuf, true);
+
+	munmap(ptr, sizeof(buf));
+
+	close(dmabuf);
+}
+
+igt_main
+{
+	int fd = -1;
+
+	igt_fixture {
+		fd = drm_open_driver(DRIVER_INTEL);
+	}
+
+	igt_subtest_group {
+		igt_fixture {
+			igt_require((has_dma_buf_read(fd)));
+		}
+
+		igt_subtest("basic-read")
+			test_read(fd);
+	}
+
+	igt_subtest_group {
+		igt_fixture {
+			igt_require((has_dma_buf_write(fd)));
+		}
+
+		igt_subtest("basic-write")
+			test_write(fd);
+	}
+
+	igt_fixture
+		close(fd);
+}