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