[RFC][PATCH 6/6 v3] kselftests: Add dma-heap test

[John Stultz]

Add very trivial allocation and import test for dma-heaps.

TODO: Still needs improvements

Cc: Benjamin Gaignard <benjamin.gaignard@xxxxxxxxxx>
Cc: Sumit Semwal <sumit.semwal@xxxxxxxxxx>
Cc: Liam Mark <lmark@xxxxxxxxxxxxxx>
Cc: Pratik Patel <pratikp@xxxxxxxxxxxxxx>
Cc: Brian Starkey <Brian.Starkey@xxxxxxx>
Cc: Vincent Donnefort <Vincent.Donnefort@xxxxxxx>
Cc: Sudipto Paul <Sudipto.Paul@xxxxxxx>
Cc: Andrew F. Davis <afd@xxxxxx>
Cc: Xu YiPing <xuyiping@xxxxxxxxxxxxx>
Cc: "Chenfeng (puck)" <puck.chen@xxxxxxxxxxxxx>
Cc: butao <butao@xxxxxxxxxxxxx>
Cc: "Xiaqing (A)" <saberlily.xia@xxxxxxxxxxxxx>
Cc: Yudongbin <yudongbin@xxxxxxxxxxxxx>
Cc: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Cc: Chenbo Feng <fengc@xxxxxxxxxx>
Cc: Alistair Strachan <astrachan@xxxxxxxxxx>
Cc: dri-devel@xxxxxxxxxxxxxxxxxxxxx
Signed-off-by: John Stultz <john.stultz@xxxxxxxxxx>
---
v2: Switched to use reworked dma-heap apis

v3:
* Add simple mmap
* Utilize dma-buf testdev to test importing
---
 tools/testing/selftests/dmabuf-heaps/Makefile      |  11 ++
 tools/testing/selftests/dmabuf-heaps/dmabuf-heap.c | 169 +++++++++++++++++++++
 2 files changed, 180 insertions(+)
 create mode 100644 tools/testing/selftests/dmabuf-heaps/Makefile
 create mode 100644 tools/testing/selftests/dmabuf-heaps/dmabuf-heap.c

diff --git a/tools/testing/selftests/dmabuf-heaps/Makefile b/tools/testing/selftests/dmabuf-heaps/Makefile
new file mode 100644
index 0000000..c414ad3
--- /dev/null
+++ b/tools/testing/selftests/dmabuf-heaps/Makefile
@@ -0,0 +1,11 @@
+# SPDX-License-Identifier: GPL-2.0
+CFLAGS += -static -O3 -Wl,-no-as-needed -Wall
+#LDLIBS += -lrt -lpthread -lm
+
+# these are all "safe" tests that don't modify
+# system time or require escalated privileges
+TEST_GEN_PROGS = dmabuf-heap
+
+
+include ../lib.mk
+
diff --git a/tools/testing/selftests/dmabuf-heaps/dmabuf-heap.c b/tools/testing/selftests/dmabuf-heaps/dmabuf-heap.c
new file mode 100644
index 0000000..df30465
--- /dev/null
+++ b/tools/testing/selftests/dmabuf-heaps/dmabuf-heap.c
@@ -0,0 +1,169 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include <dirent.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <sys/ioctl.h>
+#include <sys/mman.h>
+#include <sys/types.h>
+
+#include "../../../../include/uapi/linux/dma-heap.h"
+#include "../../../../include/uapi/linux/dma-buf-testdev.h"
+
+#define DEVPATH "/dev/dma_heap"
+
+int dmabuf_importer_open(char *name)
+{
+	int ret, fd;
+	char buf[256];
+
+	ret = sprintf(buf, "/dev/%s", name);
+	if (ret < 0) {
+		printf("sprintf failed!\n");
+		return ret;
+	}
+
+	fd = open(buf, O_RDWR);
+	if (fd < 0)
+		printf("open %s failed!\n", buf);
+	return fd;
+}
+
+int dmabuf_importer_import(int importer_fd,  int dmabuf_fd, void *phys_addr)
+{
+	struct dma_buf_testdev_data data =  {
+		.fd = dmabuf_fd,
+		.phys = 0,
+	};
+
+	int ret;
+
+	if (phys_addr == NULL)
+		return -EINVAL;
+
+	ret = ioctl(importer_fd, DMA_BUF_TESTDEV_IOC_CONVERT, &data);
+	if (ret < 0)
+		return ret;
+
+	*(__u64 *)phys_addr = data.phys;
+
+	return ret;
+}
+
+
+int dmabuf_heap_open(char *name)
+{
+	int ret, fd;
+	char buf[256];
+
+	ret = sprintf(buf, "%s/%s", DEVPATH, name);
+	if (ret < 0) {
+		printf("sprintf failed!\n");
+		return ret;
+	}
+
+	fd = open(buf, O_RDWR);
+	if (fd < 0)
+		printf("open %s failed!\n", buf);
+	return fd;
+}
+
+int dmabuf_heap_alloc(int fd, size_t len, unsigned int flags, int *dmabuf_fd)
+{
+	struct dma_heap_allocation_data data = {
+		.len = len,
+		.flags = flags,
+	};
+	int ret;
+
+	if (dmabuf_fd == NULL)
+		return -EINVAL;
+
+	ret = ioctl(fd, DMA_HEAP_IOC_ALLOC, &data);
+	if (ret < 0)
+		return ret;
+	*dmabuf_fd = (int)data.fd;
+	return ret;
+}
+
+#define ONE_MEG (1024*1024)
+
+void do_test(char *heap_name)
+{
+	int heap_fd = -1, dmabuf_fd = -1, importer_fd = -1;
+	void *p;
+	int ret;
+	long phys;
+
+	printf("Testing heap: %s\n", heap_name);
+
+	heap_fd = dmabuf_heap_open(heap_name);
+	if (heap_fd < 0)
+		return;
+
+	printf("Allocating 1 MEG\n");
+	ret = dmabuf_heap_alloc(heap_fd, ONE_MEG, 0, &dmabuf_fd);
+	if (ret)
+		goto out;
+
+
+	/* mmap and write a simple pattern */
+	p = mmap(NULL,
+		 ONE_MEG,
+		 PROT_READ | PROT_WRITE,
+		 MAP_SHARED,
+		 dmabuf_fd,
+		 0);
+	if (p == MAP_FAILED) {
+		printf("mmap() failed: %m\n");
+		abort();
+	}
+	printf("mmap passed\n");
+
+	memset(p, 1, ONE_MEG/2);
+	p = (char *)p + ONE_MEG/2;
+	memset(p, 0, ONE_MEG/2);
+	munmap(p, ONE_MEG);
+
+
+	importer_fd = dmabuf_importer_open("dma-buf-testdev");
+
+	ret = dmabuf_importer_import(importer_fd, dmabuf_fd, &phys);
+	if (ret) {
+		printf("Error importing to test device!\n");
+		goto out;
+	}
+	printf("Import passed!\n");
+
+	/* DO SOMETHING WITH THE DMABUF HERE? */
+
+out:
+	if (importer_fd >= 0)
+		close(importer_fd);
+	if (dmabuf_fd >= 0)
+		close(dmabuf_fd);
+	if (heap_fd >= 0)
+		close(heap_fd);
+}
+
+
+int main(void)
+{
+	DIR *d;
+	struct dirent *dir;
+
+	d = opendir(DEVPATH);
+	if (!d) {
+		printf("No %s directory?\n", DEVPATH);
+		return -1;
+	}
+
+	while ((dir = readdir(d)) != NULL)
+		do_test(dir->d_name);
+
+	return 0;
+}
-- 
2.7.4