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#include <linux/dma-buf.h>
#include <linux/version.h>
#include <stdlib.h>
#include <sys/utsname.h>
#include <wlr/util/log.h>
#include <xf86drm.h>
#include "render/dmabuf.h"
bool dmabuf_check_sync_file_import_export(void) {
/* Unfortunately there's no better way to check the availability of the
* IOCTL than to check the kernel version. See the discussion at:
* https://lore.kernel.org/dri-devel/20220601161303.64797-1-contact@emersion.fr/
*/
struct utsname utsname = {0};
if (uname(&utsname) != 0) {
wlr_log_errno(WLR_ERROR, "uname failed");
return false;
}
if (strcmp(utsname.sysname, "Linux") != 0) {
return false;
}
// Trim release suffix if any, e.g. "-arch1-1"
for (size_t i = 0; utsname.release[i] != '\0'; i++) {
char ch = utsname.release[i];
if ((ch < '0' || ch > '9') && ch != '.') {
utsname.release[i] = '\0';
break;
}
}
char *rel = strtok(utsname.release, ".");
int major = atoi(rel);
int minor = 0;
rel = strtok(NULL, ".");
if (rel != NULL) {
minor = atoi(rel);
}
int patch = 0;
rel = strtok(NULL, ".");
if (rel != NULL) {
patch = atoi(rel);
}
return KERNEL_VERSION(major, minor, patch) >= KERNEL_VERSION(5, 20, 0);
}
// TODO: drop these definitions once widespread
#if !defined(DMA_BUF_IOCTL_IMPORT_SYNC_FILE)
struct dma_buf_import_sync_file {
__u32 flags;
__s32 fd;
};
#define DMA_BUF_IOCTL_IMPORT_SYNC_FILE _IOW(DMA_BUF_BASE, 3, struct dma_buf_import_sync_file)
#endif
#if !defined(DMA_BUF_IOCTL_EXPORT_SYNC_FILE)
struct dma_buf_export_sync_file {
__u32 flags;
__s32 fd;
};
#define DMA_BUF_IOCTL_EXPORT_SYNC_FILE _IOWR(DMA_BUF_BASE, 2, struct dma_buf_export_sync_file)
#endif
bool dmabuf_import_sync_file(int dmabuf_fd, uint32_t flags, int sync_file_fd) {
struct dma_buf_import_sync_file data = {
.flags = flags,
.fd = sync_file_fd,
};
if (drmIoctl(dmabuf_fd, DMA_BUF_IOCTL_IMPORT_SYNC_FILE, &data) != 0) {
wlr_log_errno(WLR_ERROR, "drmIoctl(IMPORT_SYNC_FILE) failed");
return false;
}
return true;
}
int dmabuf_export_sync_file(int dmabuf_fd, uint32_t flags) {
struct dma_buf_export_sync_file data = {
.flags = flags,
.fd = -1,
};
if (drmIoctl(dmabuf_fd, DMA_BUF_IOCTL_EXPORT_SYNC_FILE, &data) != 0) {
wlr_log_errno(WLR_ERROR, "drmIoctl(EXPORT_SYNC_FILE) failed");
return -1;
}
return data.fd;
}
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