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// SPDX-License-Identifier: GPL-2.0
#include <dirent.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <sys/types.h>
#include <linux/dma-buf.h>
#include <drm/drm.h>
#include "../../../../include/uapi/linux/dma-heap.h"
#define DEVPATH "/dev/dma_heap"
static 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 0;
return !strcmp(name, "vgem");
}
static int open_vgem(void)
{
int i, fd;
const char *drmstr = "/dev/dri/card";
fd = -1;
for (i = 0; i < 16; i++) {
char name[80];
snprintf(name, 80, "%s%u", drmstr, i);
fd = open(name, O_RDWR);
if (fd < 0)
continue;
if (!check_vgem(fd)) {
close(fd);
fd = -1;
continue;
} else {
break;
}
}
return fd;
}
static int import_vgem_fd(int vgem_fd, int dma_buf_fd, uint32_t *handle)
{
struct drm_prime_handle import_handle = {
.fd = dma_buf_fd,
.flags = 0,
.handle = 0,
};
int ret;
ret = ioctl(vgem_fd, DRM_IOCTL_PRIME_FD_TO_HANDLE, &import_handle);
if (ret == 0)
*handle = import_handle.handle;
return ret;
}
static void close_handle(int vgem_fd, uint32_t handle)
{
struct drm_gem_close close = {
.handle = handle,
};
ioctl(vgem_fd, DRM_IOCTL_GEM_CLOSE, &close);
}
static int dmabuf_heap_open(char *name)
{
int ret, fd;
char buf[256];
ret = snprintf(buf, 256, "%s/%s", DEVPATH, name);
if (ret < 0) {
printf("snprintf failed!\n");
return ret;
}
fd = open(buf, O_RDWR);
if (fd < 0)
printf("open %s failed!\n", buf);
return fd;
}
static int dmabuf_heap_alloc(int fd, size_t len, unsigned int flags,
int *dmabuf_fd)
{
struct dma_heap_allocation_data data = {
.len = len,
.fd_flags = O_RDWR | O_CLOEXEC,
.heap_flags = flags,
};
int ret;
if (!dmabuf_fd)
return -EINVAL;
ret = ioctl(fd, DMA_HEAP_IOC_ALLOC, &data);
if (ret < 0)
return ret;
*dmabuf_fd = (int)data.fd;
return ret;
}
static void dmabuf_sync(int fd, int start_stop)
{
struct dma_buf_sync sync = {
.flags = start_stop | DMA_BUF_SYNC_RW,
};
int ret;
ret = ioctl(fd, DMA_BUF_IOCTL_SYNC, &sync);
if (ret)
printf("sync failed %d\n", errno);
}
#define ONE_MEG (1024 * 1024)
static int do_test(char *heap_name)
{
int heap_fd = -1, dmabuf_fd = -1, importer_fd = -1;
uint32_t handle = 0;
void *p = NULL;
int ret;
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) {
printf("Allocation Failed!\n");
ret = -1;
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");
ret = -1;
goto out;
}
printf("mmap passed\n");
dmabuf_sync(dmabuf_fd, DMA_BUF_SYNC_START);
memset(p, 1, ONE_MEG / 2);
memset((char *)p + ONE_MEG / 2, 0, ONE_MEG / 2);
dmabuf_sync(dmabuf_fd, DMA_BUF_SYNC_END);
importer_fd = open_vgem();
if (importer_fd < 0) {
ret = importer_fd;
printf("Failed to open vgem\n");
goto out;
}
ret = import_vgem_fd(importer_fd, dmabuf_fd, &handle);
if (ret < 0) {
printf("Failed to import buffer\n");
goto out;
}
printf("import passed\n");
dmabuf_sync(dmabuf_fd, DMA_BUF_SYNC_START);
memset(p, 0xff, ONE_MEG);
dmabuf_sync(dmabuf_fd, DMA_BUF_SYNC_END);
printf("syncs passed\n");
close_handle(importer_fd, handle);
ret = 0;
out:
if (p)
munmap(p, ONE_MEG);
if (importer_fd >= 0)
close(importer_fd);
if (dmabuf_fd >= 0)
close(dmabuf_fd);
if (heap_fd >= 0)
close(heap_fd);
return ret;
}
int main(void)
{
DIR *d;
struct dirent *dir;
int ret = -1;
d = opendir(DEVPATH);
if (!d) {
printf("No %s directory?\n", DEVPATH);
return -1;
}
while ((dir = readdir(d)) != NULL) {
if (!strncmp(dir->d_name, ".", 2))
continue;
if (!strncmp(dir->d_name, "..", 3))
continue;
ret = do_test(dir->d_name);
if (ret)
break;
}
closedir(d);
return ret;
}
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