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use std::cell::RefCell;
use std::collections::BTreeMap;
use std::path::PathBuf;
use std::rc::Rc;
use std::sync::Arc;
use anyhow::Context;
use argh::FromArgs;
use base::clone_descriptor;
use base::error;
use base::FromRawDescriptor;
use base::SafeDescriptor;
use base::Tube;
use base::UnixSeqpacketListener;
use base::UnlinkUnixSeqpacketListener;
use cros_async::AsyncWrapper;
use cros_async::Executor;
use cros_async::IoSource;
use hypervisor::ProtectionType;
use sync::Mutex;
use crate::virtio;
use crate::virtio::gpu;
use crate::virtio::gpu::ProcessDisplayResult;
use crate::virtio::vhost::user::device::gpu::GpuBackend;
use crate::virtio::vhost::user::device::listener::sys::VhostUserListener;
use crate::virtio::vhost::user::device::listener::VhostUserListenerTrait;
use crate::virtio::vhost::user::device::wl::parse_wayland_sock;
use crate::virtio::Gpu;
use crate::virtio::GpuDisplayParameters;
use crate::virtio::GpuParameters;
async fn run_display(
display: IoSource<AsyncWrapper<SafeDescriptor>>,
state: Rc<RefCell<gpu::Frontend>>,
) {
loop {
if let Err(e) = display.wait_readable().await {
error!(
"Failed to wait for display context to become readable: {}",
e
);
break;
}
match state.borrow_mut().process_display() {
ProcessDisplayResult::Error(e) => {
error!("Failed to process display events: {}", e);
break;
}
ProcessDisplayResult::CloseRequested => break,
ProcessDisplayResult::Success => {}
}
}
}
async fn run_resource_bridge(tube: IoSource<Tube>, state: Rc<RefCell<gpu::Frontend>>) {
loop {
if let Err(e) = tube.wait_readable().await {
error!(
"Failed to wait for resource bridge tube to become readable: {}",
e
);
break;
}
if let Err(e) = state.borrow_mut().process_resource_bridge(tube.as_source()) {
error!("Failed to process resource bridge: {:#}", e);
break;
}
}
}
impl GpuBackend {
pub fn start_platform_workers(&mut self) -> anyhow::Result<()> {
let state = self
.state
.as_ref()
.context("frontend state wasn't set")?
.clone();
for bridge in self.resource_bridges.lock().drain(..) {
let tube = self
.ex
.async_from(bridge)
.context("failed to create async tube")?;
let task = self
.ex
.spawn_local(run_resource_bridge(tube, state.clone()));
self.platform_workers.borrow_mut().push(task);
}
let display = clone_descriptor(&*state.borrow_mut().display().borrow())
.map(|fd| {
AsyncWrapper::new(unsafe { SafeDescriptor::from_raw_descriptor(fd) })
})
.context("failed to clone inner WaitContext for gpu display")
.and_then(|ctx| {
self.ex
.async_from(ctx)
.context("failed to create async WaitContext")
})?;
let task = self.ex.spawn_local(run_display(display, state));
self.platform_workers.borrow_mut().push(task);
Ok(())
}
}
fn gpu_parameters_from_str(input: &str) -> Result<GpuParameters, String> {
serde_json::from_str(input).map_err(|e| e.to_string())
}
#[derive(FromArgs)]
#[argh(subcommand, name = "gpu")]
pub struct Options {
#[argh(option, arg_name = "PATH")]
socket: String,
#[argh(option, from_str_fn(parse_wayland_sock), arg_name = "PATH[,name=NAME]")]
wayland_sock: Vec<(String, PathBuf)>,
#[argh(option, arg_name = "PATH")]
resource_bridge: Vec<String>,
#[argh(option, arg_name = "DISPLAY")]
x_display: Option<String>,
#[argh(
option,
from_str_fn(gpu_parameters_from_str),
default = "Default::default()",
arg_name = "JSON"
)]
params: GpuParameters,
}
pub fn run_gpu_device(opts: Options) -> anyhow::Result<()> {
let Options {
x_display,
params: mut gpu_parameters,
resource_bridge,
socket,
wayland_sock,
} = opts;
let channels: BTreeMap<_, _> = wayland_sock.into_iter().collect();
let resource_bridge_listeners = resource_bridge
.into_iter()
.map(|p| {
UnixSeqpacketListener::bind(&p)
.map(UnlinkUnixSeqpacketListener)
.with_context(|| format!("failed to bind socket at path {}", p))
})
.collect::<anyhow::Result<Vec<_>>>()?;
if gpu_parameters.display_params.is_empty() {
gpu_parameters
.display_params
.push(GpuDisplayParameters::default());
}
let ex = Executor::new().context("failed to create executor")?;
let resource_bridges = Arc::new(Mutex::new(Vec::with_capacity(
resource_bridge_listeners.len(),
)));
for listener in resource_bridge_listeners {
let resource_bridges = Arc::clone(&resource_bridges);
ex.spawn_blocking(move || match listener.accept() {
Ok(stream) => resource_bridges
.lock()
.push(Tube::new_from_unix_seqpacket(stream)),
Err(e) => {
let path = listener
.path()
.unwrap_or_else(|_| PathBuf::from("{unknown}"));
error!(
"Failed to accept resource bridge connection for socket {}: {}",
path.display(),
e
);
}
})
.detach();
}
let (exit_evt_wrtube, _) =
Tube::directional_pair().context("failed to create vm event tube")?;
let (gpu_control_tube, _) = Tube::pair().context("failed to create gpu control tube")?;
let mut display_backends = vec![
virtio::DisplayBackend::X(x_display),
virtio::DisplayBackend::Stub,
];
if let Some(p) = channels.get("") {
display_backends.insert(0, virtio::DisplayBackend::Wayland(Some(p.to_owned())));
}
let event_devices = Vec::new();
let base_features = virtio::base_features(ProtectionType::Unprotected);
let listener = VhostUserListener::new_socket(&socket, None)?;
let gpu = Rc::new(RefCell::new(Gpu::new(
exit_evt_wrtube,
gpu_control_tube,
Vec::new(), display_backends,
&gpu_parameters,
None,
event_devices,
base_features,
&channels,
None,
)));
let backend = Box::new(GpuBackend {
ex: ex.clone(),
gpu,
resource_bridges,
acked_protocol_features: 0,
state: None,
fence_state: Default::default(),
queue_workers: Default::default(),
platform_workers: Default::default(),
shmem_mapper: Arc::new(Mutex::new(None)),
});
let _ = ex.run_until(listener.run_backend(backend, &ex))?;
Ok(ex.run_until(async {})?)
}