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vulkan: import wl_shm buffers as udmabuf

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This commit is contained in:
Julian Orth 2025-09-30 18:52:57 +02:00
parent 47e15c6083
commit a3d3a62af3
14 changed files with 545 additions and 99 deletions
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35
src/udmabuf.rs
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@ -63,6 +63,26 @@ impl Udmabuf {
};
Ok(Self { fd })
}
pub fn create_dmabuf_from_memfd(
&self,
memfd: &OwnedFd,
offset: usize,
size: usize,
) -> Result<OwnedFd, UdmabufError> {
let mut cmd = udmabuf_create {
memfd: memfd.raw() as u32,
flags: UDMABUF_FLAGS_CLOEXEC,
offset: offset as u64,
size: size as u64,
};
let dmabuf = unsafe { ioctl(self.fd.raw(), UDMABUF_CREATE, &mut cmd) };
let dmabuf = match map_err!(dmabuf) {
Ok(d) => OwnedFd::new(d),
Err(e) => return Err(UdmabufError::CreateDmabuf(e.into())),
};
Ok(dmabuf)
}
}
impl Allocator for Udmabuf {
@ -104,17 +124,7 @@ impl Allocator for Udmabuf {
if let Err(e) = uapi::fcntl_add_seals(memfd.raw(), F_SEAL_SHRINK) {
return Err(UdmabufError::Seal(e.into()).into());
}
let mut cmd = udmabuf_create {
memfd: memfd.raw() as u32,
flags: 0,
offset: 0,
size: size as u64,
};
let dmabuf = unsafe { ioctl(self.fd.raw(), UDMABUF_CREATE, &mut cmd) };
let dmabuf = match map_err!(dmabuf) {
Ok(d) => OwnedFd::new(d),
Err(e) => return Err(UdmabufError::CreateDmabuf(e.into()).into()),
};
let dmabuf = self.create_dmabuf_from_memfd(&memfd, 0, size as _)?;
let mut planes = PlaneVec::new();
planes.push(DmaBufPlane {
offset: 0,
@ -260,6 +270,7 @@ impl From<UdmabufError> for AllocatorError {
}
#[repr(C)]
#[derive(Debug)]
struct udmabuf_create {
memfd: u32,
flags: u32,
@ -267,4 +278,6 @@ struct udmabuf_create {
size: u64,
}
const UDMABUF_FLAGS_CLOEXEC: u32 = 0x01;
const UDMABUF_CREATE: IoctlNumber = _IOW::<udmabuf_create>(b'u' as u64, 0x42) as IoctlNumber;