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#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdint.h>
#include <string.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <linux/dma-buf.h>
#include <drm/drm.h>
#include "ion.h"
#include "ionutils.h"
int check_vgem(int fd)
{
drm_version_t version = { 0 };
char name[5];
int ret;
version.name_len = 4;
version.name = name;
ret = ioctl(fd, DRM_IOCTL_VERSION, &version);
if (ret)
return 1;
return strcmp(name, "vgem");
}
int open_vgem(void)
{
int i, fd;
const char *drmstr = "/dev/dri/card";
fd = -1;
for (i = 0; i < 16; i++) {
char name[80];
sprintf(name, "%s%u", drmstr, i);
fd = open(name, O_RDWR);
if (fd < 0)
continue;
if (check_vgem(fd)) {
close(fd);
continue;
} else {
break;
}
}
return fd;
}
int import_vgem_fd(int vgem_fd, int dma_buf_fd, uint32_t *handle)
{
struct drm_prime_handle import_handle = { 0 };
int ret;
import_handle.fd = dma_buf_fd;
import_handle.flags = 0;
import_handle.handle = 0;
ret = ioctl(vgem_fd, DRM_IOCTL_PRIME_FD_TO_HANDLE, &import_handle);
if (ret == 0)
*handle = import_handle.handle;
return ret;
}
void close_handle(int vgem_fd, uint32_t handle)
{
struct drm_gem_close close = { 0 };
close.handle = handle;
ioctl(vgem_fd, DRM_IOCTL_GEM_CLOSE, &close);
}
int main()
{
int ret, vgem_fd;
struct ion_buffer_info info;
uint32_t handle = 0;
struct dma_buf_sync sync = { 0 };
info.heap_type = ION_HEAP_TYPE_SYSTEM;
info.heap_size = 4096;
info.flag_type = ION_FLAG_CACHED;
ret = ion_export_buffer_fd(&info);
if (ret < 0) {
printf("ion buffer alloc failed\n");
return -1;
}
vgem_fd = open_vgem();
if (vgem_fd < 0) {
ret = vgem_fd;
printf("Failed to open vgem\n");
goto out_ion;
}
ret = import_vgem_fd(vgem_fd, info.buffd, &handle);
if (ret < 0) {
printf("Failed to import buffer\n");
goto out_vgem;
}
sync.flags = DMA_BUF_SYNC_START | DMA_BUF_SYNC_RW;
ret = ioctl(info.buffd, DMA_BUF_IOCTL_SYNC, &sync);
if (ret)
printf("sync start failed %d\n", errno);
memset(info.buffer, 0xff, 4096);
sync.flags = DMA_BUF_SYNC_END | DMA_BUF_SYNC_RW;
ret = ioctl(info.buffd, DMA_BUF_IOCTL_SYNC, &sync);
if (ret)
printf("sync end failed %d\n", errno);
close_handle(vgem_fd, handle);
ret = 0;
out_vgem:
close(vgem_fd);
out_ion:
ion_close_buffer_fd(&info);
printf("done.\n");
return ret;
}
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