[PATCH igt v7 2/6] prime_mmap: Add new test for calling mmap() on dma-buf fds

[Tiago Vignatti <tiago.vignatti@intel.com>]

From: Rob Bradford <rob@linux.intel.com>

This test has the following subtests:
 - test_correct for correctness of the data
 - test_map_unmap checks for mapping idempotency
 - test_reprime checks for dma-buf creation idempotency
 - test_forked checks for multiprocess access
 - test_refcounting checks for buffer reference counting
 - test_dup checks that dup()ing the fd works
 - test_userptr make sure it fails when mmaping due the lack of obj->base.filp
   in a userptr.
 - test_errors checks the error return values for failures
 - test_aperture_limit tests multiple buffer creation at the gtt aperture
   limit

v2 (Tiago): Removed pattern_check(), which was walking through a useless
iterator. Removed superfluous PROT_WRITE from gem_mmap, in test_correct().
Added binary file to .gitignore
v3 (Tiago): squash patch "prime_mmap: Test for userptr mmap" into this one.
v4 (Tiago): use synchronized userptr for testing. Add test for buffer
overlapping.

Signed-off-by: Rob Bradford <rob@linux.intel.com>
Signed-off-by: Tiago Vignatti <tiago.vignatti@intel.com>
---
 tests/Makefile.sources |   1 +
 tests/prime_mmap.c     | 417 +++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 418 insertions(+)
 create mode 100644 tests/prime_mmap.c

diff --git a/tests/Makefile.sources b/tests/Makefile.sources
index d594038..75f3cb0 100644
--- a/tests/Makefile.sources
+++ b/tests/Makefile.sources
@@ -96,6 +96,7 @@ TESTS_progs_M = \
 	pm_rps \
 	pm_rc6_residency \
 	pm_sseu \
+	prime_mmap \
 	prime_self_import \
 	template \
 	$(NULL)
diff --git a/tests/prime_mmap.c b/tests/prime_mmap.c
new file mode 100644
index 0000000..95304a9
--- /dev/null
+++ b/tests/prime_mmap.c
@@ -0,0 +1,417 @@
+/*
+ * Copyright © 2014 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:
+ *    Rob Bradford <rob at linux.intel.com>
+ *
+ */
+
+/*
+ * Testcase: Check whether mmap()ing dma-buf works
+ */
+#define _GNU_SOURCE
+#include <unistd.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <fcntl.h>
+#include <inttypes.h>
+#include <errno.h>
+#include <sys/stat.h>
+#include <sys/ioctl.h>
+#include <pthread.h>
+
+#include "drm.h"
+#include "i915_drm.h"
+#include "drmtest.h"
+#include "igt_debugfs.h"
+#include "ioctl_wrappers.h"
+
+#define BO_SIZE (16*1024)
+
+static int fd;
+
+char pattern[] = {0xff, 0x00, 0x00, 0x00,
+	0x00, 0xff, 0x00, 0x00,
+	0x00, 0x00, 0xff, 0x00,
+	0x00, 0x00, 0x00, 0xff};
+
+static void
+fill_bo(uint32_t handle, size_t size)
+{
+	off_t i;
+	for (i = 0; i < size; i+=sizeof(pattern))
+	{
+		gem_write(fd, handle, i, pattern, sizeof(pattern));
+	}
+}
+
+static void
+test_correct(void)
+{
+	int dma_buf_fd;
+	char *ptr1, *ptr2;
+	uint32_t handle;
+
+	handle = gem_create(fd, BO_SIZE);
+	fill_bo(handle, BO_SIZE);
+
+	dma_buf_fd = prime_handle_to_fd(fd, handle);
+	igt_assert(errno == 0);
+
+	/* Check correctness vs GEM_MMAP_GTT */
+	ptr1 = gem_mmap__gtt(fd, handle, BO_SIZE, PROT_READ);
+	ptr2 = mmap(NULL, BO_SIZE, PROT_READ, MAP_SHARED, dma_buf_fd, 0);
+	igt_assert(ptr1 != MAP_FAILED);
+	igt_assert(ptr2 != MAP_FAILED);
+	igt_assert(memcmp(ptr1, ptr2, BO_SIZE) == 0);
+
+	/* Check pattern correctness */
+	igt_assert(memcmp(ptr2, pattern, sizeof(pattern)) == 0);
+
+	munmap(ptr1, BO_SIZE);
+	munmap(ptr2, BO_SIZE);
+	close(dma_buf_fd);
+	gem_close(fd, handle);
+}
+
+static void
+test_map_unmap(void)
+{
+	int dma_buf_fd;
+	char *ptr;
+	uint32_t handle;
+
+	handle = gem_create(fd, BO_SIZE);
+	fill_bo(handle, BO_SIZE);
+
+	dma_buf_fd = prime_handle_to_fd(fd, handle);
+	igt_assert(errno == 0);
+
+	ptr = mmap(NULL, BO_SIZE, PROT_READ, MAP_SHARED, dma_buf_fd, 0);
+	igt_assert(ptr != MAP_FAILED);
+	igt_assert(memcmp(ptr, pattern, sizeof(pattern)) == 0);
+
+	/* Unmap and remap */
+	munmap(ptr, BO_SIZE);
+	ptr = mmap(NULL, BO_SIZE, PROT_READ, MAP_SHARED, dma_buf_fd, 0);
+	igt_assert(ptr != MAP_FAILED);
+	igt_assert(memcmp(ptr, pattern, sizeof(pattern)) == 0);
+
+	munmap(ptr, BO_SIZE);
+	close(dma_buf_fd);
+	gem_close(fd, handle);
+}
+
+/* prime and then unprime and then prime again the same handle */
+static void
+test_reprime(void)
+{
+	int dma_buf_fd;
+	char *ptr;
+	uint32_t handle;
+
+	handle = gem_create(fd, BO_SIZE);
+	fill_bo(handle, BO_SIZE);
+
+	dma_buf_fd = prime_handle_to_fd(fd, handle);
+	igt_assert(errno == 0);
+
+	ptr = mmap(NULL, BO_SIZE, PROT_READ, MAP_SHARED, dma_buf_fd, 0);
+	igt_assert(ptr != MAP_FAILED);
+	igt_assert(memcmp(ptr, pattern, sizeof(pattern)) == 0);
+
+	close (dma_buf_fd);
+	igt_assert(memcmp(ptr, pattern, sizeof(pattern)) == 0);
+	munmap(ptr, BO_SIZE);
+
+	dma_buf_fd = prime_handle_to_fd(fd, handle);
+	ptr = mmap(NULL, BO_SIZE, PROT_READ, MAP_SHARED, dma_buf_fd, 0);
+	igt_assert(ptr != MAP_FAILED);
+	igt_assert(memcmp(ptr, pattern, sizeof(pattern)) == 0);
+
+	munmap(ptr, BO_SIZE);
+	close(dma_buf_fd);
+	gem_close(fd, handle);
+}
+
+/* map from another process */
+static void
+test_forked(void)
+{
+	int dma_buf_fd;
+	char *ptr;
+	uint32_t handle;
+
+	handle = gem_create(fd, BO_SIZE);
+	fill_bo(handle, BO_SIZE);
+
+	dma_buf_fd = prime_handle_to_fd(fd, handle);
+	igt_assert(errno == 0);
+
+	igt_fork(childno, 1) {
+		ptr = mmap(NULL, BO_SIZE, PROT_READ, MAP_SHARED, dma_buf_fd, 0);
+		igt_assert(ptr != MAP_FAILED);
+		igt_assert(memcmp(ptr, pattern, sizeof(pattern)) == 0);
+		munmap(ptr, BO_SIZE);
+		close(dma_buf_fd);
+	}
+	close(dma_buf_fd);
+	igt_waitchildren();
+	gem_close(fd, handle);
+}
+
+static void
+test_refcounting(void)
+{
+	int dma_buf_fd;
+	char *ptr;
+	uint32_t handle;
+
+	handle = gem_create(fd, BO_SIZE);
+	fill_bo(handle, BO_SIZE);
+
+	dma_buf_fd = prime_handle_to_fd(fd, handle);
+	igt_assert(errno == 0);
+	/* Close gem object before mapping */
+	gem_close(fd, handle);
+
+	ptr = mmap(NULL, BO_SIZE, PROT_READ, MAP_SHARED, dma_buf_fd, 0);
+	igt_assert(ptr != MAP_FAILED);
+	igt_assert(memcmp(ptr, pattern, sizeof(pattern)) == 0);
+	munmap(ptr, BO_SIZE);
+	close (dma_buf_fd);
+}
+
+/* dup before mmap */
+static void
+test_dup(void)
+{
+	int dma_buf_fd;
+	char *ptr;
+	uint32_t handle;
+
+	handle = gem_create(fd, BO_SIZE);
+	fill_bo(handle, BO_SIZE);
+
+	dma_buf_fd = dup(prime_handle_to_fd(fd, handle));
+	igt_assert(errno == 0);
+
+	ptr = mmap(NULL, BO_SIZE, PROT_READ, MAP_SHARED, dma_buf_fd, 0);
+	igt_assert(ptr != MAP_FAILED);
+	igt_assert(memcmp(ptr, pattern, sizeof(pattern)) == 0);
+	munmap(ptr, BO_SIZE);
+	gem_close(fd, handle);
+	close (dma_buf_fd);
+}
+
+
+/* Used for error case testing to avoid wrapper */
+static int prime_handle_to_fd_no_assert(uint32_t handle, int *fd_out)
+{
+	struct drm_prime_handle args;
+	int ret;
+
+	args.handle = handle;
+	args.flags = DRM_CLOEXEC;
+	args.fd = -1;
+
+	ret = drmIoctl(fd, DRM_IOCTL_PRIME_HANDLE_TO_FD, &args);
+	if (ret)
+		ret = errno;
+	*fd_out = args.fd;
+
+	return ret;
+}
+
+/* test for mmap(dma_buf_export(userptr)) */
+static void
+test_userptr(void)
+{
+	int ret, dma_buf_fd;
+	void *ptr;
+	uint32_t handle;
+
+	/* create userptr bo */
+	ret = posix_memalign(&ptr, 4096, BO_SIZE);
+	igt_assert_eq(ret, 0);
+
+	/* we are not allowed to export unsynchronized userptr. Just create a normal
+	 * one */
+	gem_userptr(fd, (uint32_t *)ptr, BO_SIZE, 0, 0, &handle);
+
+	/* export userptr */
+	ret = prime_handle_to_fd_no_assert(handle, &dma_buf_fd);
+	if (ret) {
+		igt_assert(ret == EINVAL || ret == ENODEV);
+		goto free_userptr;
+	} else {
+		igt_assert_eq(ret, 0);
+		igt_assert_lte(0, dma_buf_fd);
+	}
+
+	/* a userptr doesn't have the obj->base.filp, but can be exported via
+	 * dma-buf, so make sure it fails here */
+	ptr = mmap(NULL, BO_SIZE, PROT_READ, MAP_SHARED, dma_buf_fd, 0);
+	igt_assert(ptr == MAP_FAILED && errno == ENODEV);
+free_userptr:
+	gem_close(fd, handle);
+	close(dma_buf_fd);
+}
+
+static void
+test_errors(void)
+{
+	int dma_buf_fd;
+	char *ptr;
+	uint32_t handle;
+
+	/* Close gem object before priming */
+	handle = gem_create(fd, BO_SIZE);
+	fill_bo(handle, BO_SIZE);
+	gem_close(fd, handle);
+	prime_handle_to_fd_no_assert(handle, &dma_buf_fd);
+	igt_assert(dma_buf_fd == -1 && errno == ENOENT);
+	errno = 0;
+
+	/* close fd before mapping */
+	handle = gem_create(fd, BO_SIZE);
+	fill_bo(handle, BO_SIZE);
+	dma_buf_fd = prime_handle_to_fd(fd, handle);
+	igt_assert(errno == 0);
+	close(dma_buf_fd);
+	ptr = mmap(NULL, BO_SIZE, PROT_READ, MAP_SHARED, dma_buf_fd, 0);
+	igt_assert(ptr == MAP_FAILED && errno == EBADF);
+	errno = 0;
+	gem_close(fd, handle);
+
+	/* Map too big */
+	handle = gem_create(fd, BO_SIZE);
+	fill_bo(handle, BO_SIZE);
+	dma_buf_fd = prime_handle_to_fd(fd, handle);
+	igt_assert(errno == 0);
+	ptr = mmap(NULL, BO_SIZE * 2, PROT_READ, MAP_SHARED, dma_buf_fd, 0);
+	igt_assert(ptr == MAP_FAILED && errno == EINVAL);
+	errno = 0;
+	close(dma_buf_fd);
+	gem_close(fd, handle);
+
+	/* Overlapping the end of the buffer */
+	handle = gem_create(fd, BO_SIZE);
+	dma_buf_fd = prime_handle_to_fd(fd, handle);
+	igt_assert(errno == 0);
+	ptr = mmap(NULL, BO_SIZE, PROT_READ, MAP_SHARED, dma_buf_fd, BO_SIZE / 2);
+	igt_assert(ptr == MAP_FAILED && errno == EINVAL);
+	errno = 0;
+	close(dma_buf_fd);
+	gem_close(fd, handle);
+}
+
+static void
+test_aperture_limit(void)
+{
+	int dma_buf_fd1, dma_buf_fd2;
+	char *ptr1, *ptr2;
+	uint32_t handle1, handle2;
+	/* Two buffers the sum of which > mappable aperture */
+	uint64_t size1 = (gem_mappable_aperture_size() * 7) / 8;
+	uint64_t size2 = (gem_mappable_aperture_size() * 3) / 8;
+
+	handle1 = gem_create(fd, size1);
+	fill_bo(handle1, BO_SIZE);
+
+	dma_buf_fd1 = prime_handle_to_fd(fd, handle1);
+	igt_assert(errno == 0);
+	ptr1 = mmap(NULL, size1, PROT_READ, MAP_SHARED, dma_buf_fd1, 0);
+	igt_assert(ptr1 != MAP_FAILED);
+	igt_assert(memcmp(ptr1, pattern, sizeof(pattern)) == 0);
+
+	handle2 = gem_create(fd, size1);
+	fill_bo(handle2, BO_SIZE);
+	dma_buf_fd2 = prime_handle_to_fd(fd, handle2);
+	igt_assert(errno == 0);
+	ptr2 = mmap(NULL, size2, PROT_READ, MAP_SHARED, dma_buf_fd2, 0);
+	igt_assert(ptr2 != MAP_FAILED);
+	igt_assert(memcmp(ptr2, pattern, sizeof(pattern)) == 0);
+
+	igt_assert(memcmp(ptr1, ptr2, BO_SIZE) == 0);
+
+	munmap(ptr1, size1);
+	munmap(ptr2, size2);
+	close(dma_buf_fd1);
+	close(dma_buf_fd2);
+	gem_close(fd, handle1);
+	gem_close(fd, handle2);
+}
+
+static int
+check_for_dma_buf_mmap(void)
+{
+	int dma_buf_fd;
+	char *ptr;
+	uint32_t handle;
+	int ret = 1;
+
+	handle = gem_create(fd, BO_SIZE);
+	dma_buf_fd = prime_handle_to_fd(fd, handle);
+	ptr = mmap(NULL, BO_SIZE, PROT_READ, MAP_SHARED, dma_buf_fd, 0);
+	if (ptr != MAP_FAILED)
+		ret = 0;
+	munmap(ptr, BO_SIZE);
+	gem_close(fd, handle);
+	close(dma_buf_fd);
+	return ret;
+}
+
+igt_main
+{
+	struct {
+		const char *name;
+		void (*fn)(void);
+	} tests[] = {
+		{ "test_correct", test_correct },
+		{ "test_map_unmap", test_map_unmap },
+		{ "test_reprime", test_reprime },
+		{ "test_forked", test_forked },
+		{ "test_refcounting", test_refcounting },
+		{ "test_dup", test_dup },
+		{ "test_userptr", test_userptr },
+		{ "test_errors", test_errors },
+		{ "test_aperture_limit", test_aperture_limit },
+	};
+	int i;
+
+	igt_fixture {
+		fd = drm_open_driver(DRIVER_INTEL);
+		errno = 0;
+	}
+
+	igt_skip_on((check_for_dma_buf_mmap() != 0));
+
+	for (i = 0; i < ARRAY_SIZE(tests); i++) {
+		igt_subtest(tests[i].name)
+			tests[i].fn();
+	}
+
+	igt_fixture
+		close(fd);
+}
-- 
2.1.4

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