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gbm: handle render nodes that cannot allocate buffers

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This commit is contained in:
Julian Orth 2026-03-14 14:04:58 +01:00
parent 31f865441b
commit 8ff205a266
2 changed files with 33 additions and 15 deletions
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16
src/video/drm.rs
View file

@ -168,11 +168,13 @@ fn reopen(fd: c::c_int, need_primary: bool) -> Result<Rc<OwnedFd>, DrmError> {
return Ok(Rc::new(fd));
}
let path = 'path: {
if get_node_type_from_fd(fd).map_err(DrmError::GetDeviceType)? == NodeType::Render {
break 'path uapi::format_ustr!("/proc/self/fd/{}", fd);
}
if !need_primary && let Ok(path) = render_node_name(fd) {
break 'path path;
if !need_primary {
if get_node_type_from_fd(fd).map_err(DrmError::GetDeviceType)? == NodeType::Render {
break 'path uapi::format_ustr!("/proc/self/fd/{}", fd);
}
if let Ok(path) = render_node_name(fd) {
break 'path path;
}
}
device_node_name(fd)?
};
@ -212,6 +214,10 @@ impl Drm {
self.fd.raw()
}
pub fn dup_primary(&self) -> Result<Self, DrmError> {
Self::reopen(self.fd.raw(), true)
}
pub fn dup_render(&self) -> Result<Self, DrmError> {
Self::reopen(self.fd.raw(), false)
}

32
src/video/gbm.rs
View file

@ -7,8 +7,8 @@ use {
BO_USE_RENDERING, BO_USE_SCANOUT, BO_USE_WRITE, BufferObject, BufferUsage,
MappedBuffer,
},
format::{Format, formats},
utils::oserror::OsError,
format::{Format, XRGB8888, formats},
utils::{errorfmt::ErrorFmt, oserror::OsError},
video::{
INVALID_MODIFIER, Modifier,
dmabuf::{DmaBuf, DmaBufIds, DmaBufPlane, PlaneVec},
@ -214,14 +214,26 @@ unsafe fn export_bo(dmabuf_ids: &DmaBufIds, bo: *mut Bo) -> Result<DmaBuf, GbmEr
impl GbmDevice {
pub fn new(drm: &Drm) -> Result<Self, GbmError> {
let drm = drm.dup_render()?;
let dev = unsafe { gbm_create_device(drm.raw()) };
if dev.is_null() {
Err(GbmError::CreateDevice)
} else {
let dev = Rc::new(DeviceHolder { dev });
Ok(Self { drm, dev })
}
let open = |drm: Drm| {
let dev = unsafe { gbm_create_device(drm.raw()) };
if dev.is_null() {
Err(GbmError::CreateDevice)
} else {
let dev = Rc::new(DeviceHolder { dev });
Ok(Self { drm, dev })
}
};
let dma_buf_ids = DmaBufIds::default();
let create_bo =
|gbm: &GbmDevice| gbm.create_bo(&dma_buf_ids, 1, 1, XRGB8888, &[INVALID_MODIFIER], 0);
let gbm = open(drm.dup_render()?)?;
match create_bo(&gbm) {
Ok(..) => return Ok(gbm),
Err(e) => log::warn!("Render node cannot allocate buffers: {}", ErrorFmt(e)),
};
let gbm = open(drm.dup_primary()?)?;
create_bo(&gbm)?;
Ok(gbm)
}
pub fn raw(&self) -> *mut Device {