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dmabuf: Add gdk_dmabuf_import/export_sync_fd()

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Vulkan needs this.

This code is following the code that compositors with Wayland support -
like wlroots - are doing.

The code was introduced to Linux in
https://lore.kernel.org/dri-devel/20220506180216.2095060-1-jason@jlekstrand.net/
This commit is contained in:
Benjamin Otte 2023-11-26 05:58:57 +01:00
parent a37b3fb691
commit 5ca4ab3aaa
2 changed files with 60 additions and 0 deletions
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55
gdk/gdkdmabuf.c
View File

@ -835,6 +835,61 @@ gdk_dmabuf_ioctl (int fd,
return ret;
}
#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
gboolean
gdk_dmabuf_import_sync_file (int dmabuf_fd,
guint32 flags,
int sync_file_fd)
{
struct dma_buf_import_sync_file data = {
.flags = flags,
.fd = sync_file_fd,
};
if (gdk_dmabuf_ioctl (dmabuf_fd, DMA_BUF_IOCTL_IMPORT_SYNC_FILE, &data) != 0)
{
GDK_DEBUG (DMABUF, "Importing dmabuf sync failed: %s", g_strerror (errno));
return FALSE;
}
return TRUE;
}
#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
int
gdk_dmabuf_export_sync_file (int dmabuf_fd,
guint32 flags)
{
struct dma_buf_export_sync_file data = {
.flags = flags,
.fd = -1,
};
if (gdk_dmabuf_ioctl (dmabuf_fd, DMA_BUF_IOCTL_EXPORT_SYNC_FILE, &data) != 0)
{
GDK_DEBUG (DMABUF, "Exporting dmabuf sync failed: %s", g_strerror (errno));
return -1;
}
return data.fd;
}
/*
* Tries to sanitize the dmabuf to conform to the values expected
* by Vulkan/EGL which should also be the values expected by

5
gdk/gdkdmabufprivate.h
View File

@ -46,6 +46,11 @@ const GdkDmabufDownloader * gdk_dmabuf_get_egl_downloader (void) G_GNUC_CO
int gdk_dmabuf_ioctl (int fd,
unsigned long request,
void *arg);
gboolean gdk_dmabuf_import_sync_file (int dmabuf_fd,
guint32 flags,
int sync_file_fd);
int gdk_dmabuf_export_sync_file (int dmabuf_fd,
guint32 flags);
gboolean gdk_dmabuf_sanitize (GdkDmabuf *dest,
gsize width,