Add ion helper library

This library contains helper functions for using ion

Change-Id: I7d7f76d6d3f36cd94d67797a38099a94214392b1
Signed-off-by: Rebecca Schultz Zavin <rebecca@android.com>

3 files changed, 431 insertions, 0 deletions

diff --git a/libion/Android.mk b/libion/Android.mk
new file mode 100644
index 0000000..6abac3c
--- /dev/null
+++ b/libion/Android.mk
@@ -0,0 +1,15 @@
+LOCAL_PATH:= $(call my-dir)
+
+include $(CLEAR_VARS)
+LOCAL_SRC_FILES := ion.c
+LOCAL_MODULE := libion
+LOCAL_MODULE_TAGS := optional
+LOCAL_SHARED_LIBRARIES := liblog
+include $(BUILD_HEAPTRACKED_SHARED_LIBRARY)
+
+include $(CLEAR_VARS)
+LOCAL_SRC_FILES := ion.c ion_test.c
+LOCAL_MODULE := iontest
+LOCAL_MODULE_TAGS := optional tests
+LOCAL_SHARED_LIBRARIES := liblog
+include $(BUILD_HEAPTRACKED_EXECUTABLE)
diff --git a/libion/ion.c b/libion/ion.c
new file mode 100644
index 0000000..dbeac23
--- /dev/null
+++ b/libion/ion.c
@@ -0,0 +1,134 @@
+/*
+ *  ion.c
+ *
+ * Memory Allocator functions for ion
+ *
+ *   Copyright 2011 Google, Inc
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ */
+#define LOG_TAG "ion"
+
+#include <cutils/log.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <sys/ioctl.h>
+#include <sys/mman.h>
+#include <sys/types.h>
+
+#include <linux/ion.h>
+#include <ion/ion.h>
+
+int ion_open()
+{
+        int fd = open("/dev/ion", O_RDWR);
+        if (fd < 0)
+                ALOGE("open /dev/ion failed!\n");
+        return fd;
+}
+
+int ion_close(int fd)
+{
+        return close(fd);
+}
+
+static int ion_ioctl(int fd, int req, void *arg)
+{
+        int ret = ioctl(fd, req, arg);
+        if (ret < 0) {
+                ALOGE("ioctl %x failed with code %d: %s\n", req,
+                       ret, strerror(errno));
+                return -errno;
+        }
+        return ret;
+}
+
+int ion_alloc(int fd, size_t len, size_t align, unsigned int flags,
+              struct ion_handle **handle)
+{
+        int ret;
+        struct ion_allocation_data data = {
+                .len = len,
+                .align = align,
+                .flags = flags,
+        };
+
+        ret = ion_ioctl(fd, ION_IOC_ALLOC, &data);
+        if (ret < 0)
+                return ret;
+        *handle = data.handle;
+        return ret;
+}
+
+int ion_free(int fd, struct ion_handle *handle)
+{
+        struct ion_handle_data data = {
+                .handle = handle,
+        };
+        return ion_ioctl(fd, ION_IOC_FREE, &data);
+}
+
+int ion_map(int fd, struct ion_handle *handle, size_t length, int prot,
+            int flags, off_t offset, unsigned char **ptr, int *map_fd)
+{
+        struct ion_fd_data data = {
+                .handle = handle,
+        };
+
+        int ret = ion_ioctl(fd, ION_IOC_MAP, &data);
+        if (ret < 0)
+                return ret;
+        *map_fd = data.fd;
+        if (*map_fd < 0) {
+                ALOGE("map ioctl returned negative fd\n");
+                return -EINVAL;
+        }
+        *ptr = mmap(NULL, length, prot, flags, *map_fd, offset);
+        if (*ptr == MAP_FAILED) {
+                ALOGE("mmap failed: %s\n", strerror(errno));
+                return -errno;
+        }
+        return ret;
+}
+
+int ion_share(int fd, struct ion_handle *handle, int *share_fd)
+{
+        int map_fd;
+        struct ion_fd_data data = {
+                .handle = handle,
+        };
+
+        int ret = ion_ioctl(fd, ION_IOC_SHARE, &data);
+        if (ret < 0)
+                return ret;
+        *share_fd = data.fd;
+        if (*share_fd < 0) {
+                ALOGE("share ioctl returned negative fd\n");
+                return -EINVAL;
+        }
+        return ret;
+}
+
+int ion_import(int fd, int share_fd, struct ion_handle **handle)
+{
+        struct ion_fd_data data = {
+                .fd = share_fd,
+        };
+
+        int ret = ion_ioctl(fd, ION_IOC_IMPORT, &data);
+        if (ret < 0)
+                return ret;
+        *handle = data.handle;
+        return ret;
+}
diff --git a/libion/ion_test.c b/libion/ion_test.c
new file mode 100644
index 0000000..3f2d7cc
--- /dev/null
+++ b/libion/ion_test.c
@@ -0,0 +1,282 @@
+#include <errno.h>
+#include <fcntl.h>
+#include <getopt.h>
+#include <string.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <sys/mman.h>
+#include <sys/ioctl.h>
+#include <sys/socket.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+#include <ion/ion.h>
+#include <linux/ion.h>
+#include <linux/omap_ion.h>
+
+size_t len = 1024*1024, align = 0;
+int prot = PROT_READ | PROT_WRITE;
+int map_flags = MAP_SHARED;
+int alloc_flags = 0;
+int test = -1;
+size_t width = 1024*1024, height = 1024*1024;
+size_t stride;
+
+int _ion_alloc_test(int *fd, struct ion_handle **handle)
+{
+	int ret;
+
+	*fd = ion_open();
+	if (*fd < 0)
+		return *fd;
+
+	ret = ion_alloc(*fd, len, align, alloc_flags, handle);
+
+	if (ret)
+		printf("%s failed: %s\n", __func__, strerror(ret));
+	return ret;
+}
+
+void ion_alloc_test()
+{
+	int fd, ret;
+	struct ion_handle *handle;
+
+	if(_ion_alloc_test(&fd, &handle))
+			return;
+
+	ret = ion_free(fd, handle);
+	if (ret) {
+		printf("%s failed: %s %p\n", __func__, strerror(ret), handle);
+		return;
+	}
+	ion_close(fd);
+	printf("ion alloc test: passed\n");
+}
+
+void ion_map_test()
+{
+	int fd, map_fd, ret;
+	size_t i;
+	struct ion_handle *handle;
+	unsigned char *ptr;
+
+	if(_ion_alloc_test(&fd, &handle))
+		return;
+
+	ret = ion_map(fd, handle, len, prot, map_flags, 0, &ptr, &map_fd);
+	if (ret)
+		return;
+
+	for (i = 0; i < len; i++) {
+		ptr[i] = (unsigned char)i;
+	}
+	for (i = 0; i < len; i++)
+		if (ptr[i] != (unsigned char)i)
+			printf("%s failed wrote %d read %d from mapped "
+			       "memory\n", __func__, i, ptr[i]);
+	/* clean up properly */
+	ret = ion_free(fd, handle);
+	ion_close(fd);
+	munmap(ptr, len);
+	close(map_fd);
+
+	_ion_alloc_test(&fd, &handle);
+	close(fd);
+
+#if 0
+	munmap(ptr, len);
+	close(map_fd);
+	ion_close(fd);
+
+	_ion_alloc_test(len, align, flags, &fd, &handle);
+	close(map_fd);
+	ret = ion_map(fd, handle, len, prot, flags, 0, &ptr, &map_fd);
+	/* don't clean up */
+#endif
+}
+
+void ion_share_test()
+
+{
+	struct ion_handle *handle;
+	int sd[2];
+	int num_fd = 1;
+	struct iovec count_vec = {
+		.iov_base = &num_fd,
+		.iov_len = sizeof num_fd,
+	};
+	char buf[CMSG_SPACE(sizeof(int))];
+	socketpair(AF_UNIX, SOCK_STREAM, 0, sd);
+	if (fork()) {
+		struct msghdr msg = {
+			.msg_control = buf,
+			.msg_controllen = sizeof buf,
+			.msg_iov = &count_vec,
+			.msg_iovlen = 1,
+		};
+
+		struct cmsghdr *cmsg;
+		int fd, share_fd, ret;
+		char *ptr;
+		/* parent */
+		if(_ion_alloc_test(&fd, &handle))
+			return;
+		ret = ion_share(fd, handle, &share_fd);
+		if (ret)
+			printf("share failed %s\n", strerror(errno));
+		ptr = mmap(NULL, len, prot, map_flags, share_fd, 0);
+		if (ptr == MAP_FAILED) {
+			return;
+		}
+		strcpy(ptr, "master");
+		cmsg = CMSG_FIRSTHDR(&msg);
+		cmsg->cmsg_level = SOL_SOCKET;
+		cmsg->cmsg_type = SCM_RIGHTS;
+		cmsg->cmsg_len = CMSG_LEN(sizeof(int));
+		*(int *)CMSG_DATA(cmsg) = share_fd;
+		/* send the fd */
+		printf("master? [%10s] should be [master]\n", ptr);
+		printf("master sending msg 1\n");
+		sendmsg(sd[0], &msg, 0);
+		if (recvmsg(sd[0], &msg, 0) < 0)
+			perror("master recv msg 2");
+		printf("master? [%10s] should be [child]\n", ptr);
+
+		/* send ping */
+		sendmsg(sd[0], &msg, 0);
+		printf("master->master? [%10s]\n", ptr);
+		if (recvmsg(sd[0], &msg, 0) < 0)
+			perror("master recv 1");
+	} else {
+		struct msghdr msg;
+		struct cmsghdr *cmsg;
+		char* ptr;
+		int fd, recv_fd;
+		char* child_buf[100];
+		/* child */
+		struct iovec count_vec = {
+			.iov_base = child_buf,
+			.iov_len = sizeof child_buf,
+		};
+
+		struct msghdr child_msg = {
+			.msg_control = buf,
+			.msg_controllen = sizeof buf,
+			.msg_iov = &count_vec,
+			.msg_iovlen = 1,
+		};
+
+		if (recvmsg(sd[1], &child_msg, 0) < 0)
+			perror("child recv msg 1");
+		cmsg = CMSG_FIRSTHDR(&child_msg);
+		if (cmsg == NULL) {
+			printf("no cmsg rcvd in child");
+			return;
+		}
+		recv_fd = *(int*)CMSG_DATA(cmsg);
+		if (recv_fd < 0) {
+			printf("could not get recv_fd from socket");
+			return;
+		}
+		printf("child %d\n", recv_fd);
+		fd = ion_open();
+		ptr = mmap(NULL, len, prot, map_flags, recv_fd, 0);
+		if (ptr == MAP_FAILED) {
+			return;
+		}
+		printf("child? [%10s] should be [master]\n", ptr);
+		strcpy(ptr, "child");
+		printf("child sending msg 2\n");
+		sendmsg(sd[1], &child_msg, 0);
+	}
+}
+
+int main(int argc, char* argv[]) {
+	int c;
+	enum tests {
+		ALLOC_TEST = 0, MAP_TEST, SHARE_TEST,
+	};
+
+	while (1) {
+		static struct option opts[] = {
+			{"alloc", no_argument, 0, 'a'},
+			{"alloc_flags", required_argument, 0, 'f'},
+			{"map", no_argument, 0, 'm'},
+			{"share", no_argument, 0, 's'},
+			{"len", required_argument, 0, 'l'},
+			{"align", required_argument, 0, 'g'},
+			{"map_flags", required_argument, 0, 'z'},
+			{"prot", required_argument, 0, 'p'},
+			{"width", required_argument, 0, 'w'},
+			{"height", required_argument, 0, 'h'},
+		};
+		int i = 0;
+		c = getopt_long(argc, argv, "af:h:l:mr:stw:", opts, &i);
+		if (c == -1)
+			break;
+
+		switch (c) {
+		case 'l':
+			len = atol(optarg);
+			break;
+		case 'g':
+			align = atol(optarg);
+			break;
+		case 'z':
+			map_flags = 0;
+			map_flags |= strstr(optarg, "PROT_EXEC") ?
+				PROT_EXEC : 0;
+			map_flags |= strstr(optarg, "PROT_READ") ?
+				PROT_READ: 0;
+			map_flags |= strstr(optarg, "PROT_WRITE") ?
+				PROT_WRITE: 0;
+			map_flags |= strstr(optarg, "PROT_NONE") ?
+				PROT_NONE: 0;
+			break;
+		case 'p':
+			prot = 0;
+			prot |= strstr(optarg, "MAP_PRIVATE") ?
+				MAP_PRIVATE	 : 0;
+			prot |= strstr(optarg, "MAP_SHARED") ?
+				MAP_PRIVATE	 : 0;
+			break;
+		case 'f':
+			alloc_flags = atol(optarg);
+			break;
+		case 'a':
+			test = ALLOC_TEST;
+			break;
+		case 'm':
+			test = MAP_TEST;
+			break;
+		case 's':
+			test = SHARE_TEST;
+			break;
+		case 'w':
+			width = atol(optarg);
+			break;
+		case 'h':
+			height = atol(optarg);
+			break;
+		}
+	}
+	printf("test %d, len %u, width %u, height %u align %u, "
+		   "map_flags %d, prot %d, alloc_flags %d\n", test, len, width,
+		   height, align, map_flags, prot, alloc_flags);
+	switch (test) {
+		case ALLOC_TEST:
+			ion_alloc_test();
+			break;
+		case MAP_TEST:
+			ion_map_test();
+			break;
+		case SHARE_TEST:
+			ion_share_test();
+			break;
+		default:
+			printf("must specify a test (alloc, map, share)\n");
+	}
+	return 0;
+}